Add snapshot evidence to cancel-cascade MTF issue doc

Append "Snapshot evidence (2026-05-13)" section to
`cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`
documenting `fail_after_w_trace` diag capture results for
`test_nested_multierrors` under the MTF backend — reproduction cmd,
ptree analysis, observed hang signature, and updated triage plan.

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

(cherry picked from commit 5372fd178a)

.github/workflows/docs.yml

@@ -1,63 +0,0 @@
-name: docs
-
-# build sphinx docs on every PR + push to main;
-# deploy to gh-pages only from main pushes.
-# (see goodboy/tractor#123 for the original ask)
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-  # to run workflow manually from the "Actions" tab
-  workflow_dispatch:
-
-# needed by actions/deploy-pages
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-
-jobs:
-  build:
-    name: 'sphinx build'
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Install latest uv
-        uses: astral-sh/setup-uv@v6
-
-      # NOTE, no `d2` bin is installed in CI (yet) so
-      # the pre-rendered + committed SVGs under
-      # `docs/_diagrams/` are used as-is; see
-      # `docs/_ext/d2diagrams.py` for the fallback
-      # policy.
-      - name: Build html docs
-        run: |
-          uv sync --no-dev --group docs
-          uv run --no-dev --group docs make -C docs html
-
-      - name: Upload pages artifact
-        uses: actions/upload-pages-artifact@v3
-        with:
-          path: docs/_build/html
-
-  deploy:
-    name: 'deploy to gh-pages'
-    if: ${{ github.ref == 'refs/heads/main' && github.event_name == 'push' }}
-    needs: build
-    # serialize deploys but NEVER cancel an in-flight one
-    # mid-upload; queue the next instead (scoped to this job so
-    # PR builds can't cancel a production deploy).
-    concurrency:
-      group: 'pages'
-      cancel-in-progress: false
-    runs-on: ubuntu-latest
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    steps:
-      - name: Deploy
-        id: deployment
-        uses: actions/deploy-pages@v4

NEWS.rst

@@ -78,7 +78,6 @@ Bug Fixes
   for ``asyncio``-side errors to not propagate due to a race condition.
 
   The implementation fix summary is:
-
   - add state to signal the end of the ``trio`` side task to be
     read by the ``asyncio`` side and always cancel any ongoing
     task in such cases.

ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.md

@@ -1,93 +0,0 @@
----
-model: claude-fable-5[1m]
-service: claude
-session: 0780a862-e19a-4f0a-86cd-c8afc0997757
-timestamp: 2026-06-11T17:51:52Z
-git_ref: 8526985c
-scope: docs+code+config
-substantive: true
-raw_file: 20260611T175152Z_8526985c_prompt_io.raw.md
----
-
-## Prompt
-
-> we need big boi docs; ours are way out of date and generally
-> terrible. i'd like to use a sphinx theme in the vein and/or
-> one-of/nearly-the-same-as used in one or all of the `msgspec`,
-> `numpy`, `ray`, `xonsh`, `polars` projects.
->
-> see the following oustanding but now very old issues to guide
-> you: #175, #126, #123, #157
->
-> we should try to target a 3 columned sphinx theme with,
-> - document index-nav on left,
-> - body content in middle,
-> - diagrams (ideally in d2lang if possible) on RHS
->
-> optimize for (if possible),
-> - reusing examples code without duplication in docs,
-> - generating new examples from todos throughout code base,
-> - distilling the essence of SC across processes in the simplest
->   and most friendly way possible.
->
-> do this work in a /open-wkt and do you best without my guidance
-> for the first major pass - we will refine asap once you are
-> complete.
-
-Session settings: `/effort max` + ultracode (multi-agent workflow
-orchestration). Fully autonomous first pass; two orchestrated
-agent fleets were used (6-agent recon survey, then 10-agent
-content fan-out: 9 section writers + 1 examples smith), with the
-orchestrator authoring the landing page, SC essay, sphinx
-scaffold, d2 pipeline + diagram sources, CI workflow and all
-integration/fix passes directly.
-
-## Response summary
-
-Complete sphinx docs revamp on branch `wkt/big_boi_docs`:
-`pydata-sphinx-theme` 0.18 (3-column: left nav / content /
-page-toc, with d2 diagrams + asides floated into the RHS margin
-via custom CSS), sphinx 9.1, a local `.. d2::` directive
-rendering `docs/diagrams/*.d2` sources with committed-SVG
-fallback, a vendored `.. margin::` directive, ~25 new doc pages
-(landing, start/, explain/, 12 guides, 10 api-ref pages,
-project/), 5 new auto-tested examples + 3 modernized + 1
-renamed, and a gh-pages deploy workflow (issue #123). All
-example code is `literalinclude`d from `examples/` (zero
-duplication, CI-verified). Build: green, 24 warnings all
-pre-existing-docstring/NEWS sourced.
-
-## Files changed
-
-See the branch diff (uncommitted at entry-write time):
-
-> `git diff test_cpu_throttling..wkt/big_boi_docs`
-> `git -C <wkt> status --short` (pre-commit working tree)
-
-- `docs/conf.py` — full rewrite for pydata theme + ext stack
-- `docs/_ext/d2diagrams.py` — new `.. d2::` sphinx directive
-- `docs/_ext/marginalia.py` — new `.. margin::` directive
-- `docs/_static/css/custom.css` — b&w skin + RHS margin floats
-- `docs/diagrams/*.d2` (7) — diagram sources (sketch/grayscale)
-- `docs/_diagrams/*.svg` (7) — committed rendered fallbacks
-- `docs/index.rst` — new landing (replaces dead-API doc)
-- `docs/start/*.rst` (3), `docs/explain/*.rst` (3),
-  `docs/guide/*.rst` (13), `docs/api/*.rst` (10),
-  `docs/project/*.rst` (3) — new content tree
-- `docs/dev_tips.rst` — removed (ported to project/dev-tips)
-- `examples/{typed_payloads,nested_actor_tree,
-  service_daemon_discovery,uds_transport_actor_tree,
-  streaming_broadcast_fanout}.py` — new, smoke-tested
-- `examples/{a_trynamic_first_scene,
-  actor_spawning_and_causality,parallelism/single_func}.py` —
-  `.result()` -> `.wait_for_result()` modernization
-- `examples/parallelism/concurrent_futures_primes.py` — renamed
-  from leading-underscore + trio-runner shim added
-- `pyproject.toml` — `docs` dependency-group filled in
-- `uv.lock` — relock for docs group
-- `.github/workflows/docs.yml` — build + gh-pages deploy
-
-## Human edits
-
-None yet — entry written pre-commit; the author reviews, stages
-and commits manually (per repo workflow policy).

ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.raw.md

@@ -1,49 +0,0 @@
----
-model: claude-fable-5[1m]
-service: claude
-timestamp: 2026-06-11T17:51:52Z
-git_ref: 8526985c
-diff_cmd: git diff test_cpu_throttling..wkt/big_boi_docs
----
-
-# Raw output pointers (diff-ref mode)
-
-All generated content is code/config/docs committed alongside
-this entry on branch `wkt/big_boi_docs`; per the prompt-io
-diff-ref decision rule each file's verbatim content is the diff
-itself rather than a copy here:
-
-> `git diff test_cpu_throttling..wkt/big_boi_docs -- docs/`
-> `git diff test_cpu_throttling..wkt/big_boi_docs -- examples/`
-> `git diff test_cpu_throttling..wkt/big_boi_docs -- pyproject.toml uv.lock .github/`
-
-## Generation notes (non-code output summary)
-
-- Theme research (web, agent-verified 2026-06-11): msgspec=furo,
-  xonsh=furo, numpy/ray/polars=pydata-sphinx-theme (ray migrated
-  off sphinx-book-theme); sphinx-book-theme 1.2.0 hard-pins
-  pydata 0.16.1 (stale) -> chose pydata 0.18 + sphinx 9.1.
-- d2 ecosystem: no production-grade pypi extension exists
-  (sphinxcontrib-d2lang 0.0.5 ignores returncodes, uuid4 output
-  names; sphinx-d2 is an empty stub) -> wrote local
-  `docs/_ext/d2diagrams.py` (~230 LOC) with D2_BIN env
-  discovery, mtime caching, committed-SVG fallback and
-  literal-block last resort.
-- Diagrams authored in d2 (theme-id 1 "Neutral Grey" + sketch
-  mode + ELK layout, validated by render + headless-firefox
-  screenshot loop): actor_tree, context_handshake (real
-  msg-spec names Start/StartAck/Started/Yield/Stop/Return),
-  streaming_pipeline, runtime_stack, debug_lock,
-  error_propagation, infected_aio.
-- API truth enforced from a 6-agent recon pass over the
-  reorganized package tree (runtime/, discovery/, spawn/, ipc/,
-  msg/, devx/, trionics/): docs teach `.wait_for_result()`,
-  registrar (not arbiter) naming, `@tractor.context` +
-  `open_context()` as the core model, `run_in_actor()` as
-  convenience only.
-- All ~30 literalincluded example scripts verified present; 9
-  touched/new example files smoke-run green (exit 0, <16s).
-- Final build: `sphinx-build -b html` succeeded; 24 residual
-  warnings, every one sourced from pre-existing library
-  docstring rst-isms or legacy NEWS.rst content (left untouched
-  by design; flagged for a follow-up docstring lint pass).

ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.md

@@ -1,65 +0,0 @@
----
-model: claude-fable-5[1m]
-service: claude
-session: 638d5a98-abd2-4217-a447-19f2330eb334
-timestamp: 2026-06-25T23:25:06Z
-git_ref: 0a3c48fc
-scope: code
-substantive: true
-raw_file: 20260625T232506Z_0a3c48fc_prompt_io.raw.md
----
-
-## Prompt
-
-Same `/code-review` follow-up session (PR #460). Finding #10:
-the new `api/` autodoc reference pages surfaced 22 docutils
-warnings sourced from informal reST in public docstrings. The
-user opted to fix it on this branch,
-
-> well we're on a clean main so why not just do these now too?
-
-Goal: drive the docs build warning-free (24 -> 0) without any
-code/behaviour change — docstring content only.
-
-## Response summary
-
-Surgical docstring-RST lint across 9 library modules + the one
-offending `NEWS.rst` changelog entry,
-
-- bullet lists given a blank line + base-column indent
-  (`Context`, `Context.cancel_called`/`.cancelled_caught`/
-  `.outcome`, `ActorNursery.cancel_called`, `query_actor`,
-  `open_crash_handler`, the `#318` `NEWS.rst` entry),
-- the under-short `Behaviour:` underline in `Context.cancel`
-  demoted to a `**bold**` label,
-- unbalanced/pluralized-role backticks fixed — closed the
-  `wait_for_actor` summary backtick; applied the `` `role`\ s ``
-  escaped-plural idiom in `gather_contexts`, `mk_pdb`,
-  `MsgCodec`, msg `Error`, `open_context_from_portal`,
-- the `|_` method-tree in `ContextCancelled.canceller` made a
-  literal block (bare `|` was parsed as a substitution ref).
-
-Verified: build `24 -> 0` warnings; `import tractor` clean under
-`-W error::SyntaxWarning`; the `\ s` idiom renders as e.g.
-"acms" (no backslash/space leak in HTML); `ruff` clean; diff
-confirmed docstring-content-only.
-
-Initial generation was delegated to a constrained subagent
-(docstring-only edits + a rebuild-to-zero verification gate);
-the orchestrator independently re-built, reviewed the full
-diff, and added the `NEWS.rst` fix to reach zero.
-
-## Files changed
-
-- `tractor/_context.py`, `tractor/_exceptions.py`,
-  `tractor/devx/debug/_post_mortem.py`,
-  `tractor/devx/debug/_repl.py`, `tractor/discovery/_api.py`,
-  `tractor/msg/_codec.py`, `tractor/msg/types.py`,
-  `tractor/runtime/_supervise.py`,
-  `tractor/trionics/_mngrs.py` — docstring reST fixes,
-- `NEWS.rst` — blank line before a bullet list in the `#318`
-  entry.
-
-## Human edits
-
-None — committed as generated (`0a3c48fc`).

ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.raw.md

@@ -1,35 +0,0 @@
----
-model: claude-fable-5[1m]
-service: claude
-timestamp: 2026-06-25T23:25:06Z
-git_ref: 0a3c48fc
-diff_cmd: git diff 0a3c48fc~1..0a3c48fc
----
-
-# Raw output pointers (diff-ref mode)
-
-The generated patch is committed; the verbatim content is the
-diff:
-
-> `git diff 0a3c48fc~1..0a3c48fc`
-
-## Generation notes (non-code, verbatim)
-
-- Pure docstring-content edits; no signatures, logic, or
-  non-docstring lines touched (confirmed via `git diff` review).
-- reST fix patterns applied: blank-line + base-column indent
-  for bullet lists ("Unexpected indentation" / "Definition
-  list ..." / "Block quote ..."); `**bold**` in place of an
-  under-length section underline ("Title underline too short");
-  closing/escaping backticks ("Inline interpreted text ...
-  without end-string"); literal-block for an ASCII tree whose
-  `|` chars tripped "Inline substitution_reference ...".
-- The pluralized-role idiom is written `\\ s` in the Python
-  source (so the runtime docstring holds `` `role`\ s ``); a
-  bare `\ ` would raise a 3.13 invalid-escape SyntaxWarning.
-  Verified clean via `python -W error::SyntaxWarning -c
-  "import tractor"`.
-- Verification gate: `sphinx-build` warning count 24 -> 2
-  (subagent, docstrings only) -> 0 after the orchestrator added
-  the `NEWS.rst` blank-line fix; rendered-HTML spot-check
-  confirmed no literal `\ s` leak; `ruff check` clean.

ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.md

@@ -1,64 +0,0 @@
----
-model: claude-fable-5[1m]
-service: claude
-session: 638d5a98-abd2-4217-a447-19f2330eb334
-timestamp: 2026-06-25T23:25:06Z
-git_ref: 3a5cfde0
-scope: code
-substantive: true
-raw_file: 20260625T232506Z_3a5cfde0_prompt_io.raw.md
----
-
-## Prompt
-
-Follow-up to a `/code-review` of PR #460 (this branch) which
-surfaced lower-severity findings in the `.. d2::` sphinx
-directive. The user's driving instructions across the session,
-
-> yup do both *at least*, then report back.
-
-(re: "implement #7 (+ optionally #8) on the branch") and,
-
-> well we're on a clean main so why not just do these now too?
-
-(re: also doing #9). The three findings being addressed,
-
-- #7: a `d2` render that is *attempted and fails* (binary
-  present but errors on the source) silently degraded to the
-  stale committed SVG and the build still exited 0,
-- #8: `parallel_*_safe = True` was declared while `run()`
-  writes the shared output SVG during the read phase (torn
-  write under `sphinx-build -j`),
-- #9: output keyed only by `src.stem` so two `.d2` sources
-  with the same stem collide.
-
-## Response summary
-
-Reworked `docs/_ext/d2diagrams.py`,
-
-- `render_svg()` now returns a `RenderResult` tristate
-  (`OK` / `FELL_BACK` / `NO_OUTPUT` / `FAILED`) so `run()` can
-  distinguish a graceful no-binary fallback from a real render
-  failure; `FAILED` emits a `reporter.error` (build fails under
-  `-W`),
-- the render writes into a sibling temp-file then `os.replace()`
-  (atomic) so a failed/torn render can never clobber a good
-  committed SVG,
-- a per-build `_seen_outputs` map (reset on `builder-inited`)
-  errors on a same-stem output collision.
-
-Verified: a corrupted `.d2` errors under `-W` (exit 1) with the
-committed SVG byte-unchanged; the collision guard fires on a
-duplicate stem; `nix run nixpkgs#d2` render path + atomic swap
-leave no temp residue; `ruff` clean.
-
-## Response summary (cont.) — Files changed
-
-- `docs/_ext/d2diagrams.py` — tristate render result, atomic
-  temp-file render, output-collision guard, doc-string policy
-  update.
-
-## Human edits
-
-None — committed as generated (`3a5cfde0`). The user noted
-follow-up refinements may come in later commits.

ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.raw.md

@@ -1,35 +0,0 @@
----
-model: claude-fable-5[1m]
-service: claude
-timestamp: 2026-06-25T23:25:06Z
-git_ref: 3a5cfde0
-diff_cmd: git diff 3a5cfde0~1..3a5cfde0
----
-
-# Raw output pointers (diff-ref mode)
-
-The generated patch is committed; per the diff-ref decision
-rule the verbatim content is the diff itself:
-
-> `git diff 3a5cfde0~1..3a5cfde0 -- docs/_ext/d2diagrams.py`
-
-## Generation notes (non-code, verbatim)
-
-- `RenderResult` enum added; `render_svg()` return type changed
-  `bool -> RenderResult`. Mapping in `run()`: `FAILED` ->
-  `state_machine.reporter.error(...)`, `NO_OUTPUT` -> raw `.d2`
-  source as a `literal_block`, `OK`/`FELL_BACK` -> `image`.
-- Atomicity via `tempfile.mkstemp(dir=out.parent, ...)` +
-  `os.replace(tmp, out)`; temp unlinked on any failure path.
-- Collision guard: module-level `_seen_outputs: dict[str,str]`
-  keyed by output basename, cleared by a `builder-inited`
-  handler connected in `setup()`.
-- `parallel_read_safe`/`parallel_write_safe` kept `True` but
-  now justified by the atomic swap (documented inline).
-- Empirical verification performed before commit:
-  - broken `.d2` + `sphinx-build -W` -> exit 1, ERROR node
-    rendered, committed `actor_tree.svg` md5 unchanged,
-  - duplicate-stem orphan page -> "d2 output collision" error,
-  - `nix run nixpkgs#d2` forced re-render -> deterministic
-    (no git drift), no `.tmp` residue,
-  - `ruff check` clean.

docs/README.rst

@@ -1,4 +1,4 @@
-|logo| ``tractor``: distributed structured concurrency
+|logo| ``tractor``: distributed structurred concurrency
 
 ``tractor`` is a `structured concurrency`_ (SC), multi-processing_ runtime built on trio_.
 
@@ -23,11 +23,16 @@ model" looks like, and that's **intentional**.
 
 Where do i start!?
 ------------------
-New to ``trio`` and **structured concurrency**? Our docs collect the
-best starting points and then walk you straight into a hands-on
-quickstart:
+The first step to grok ``tractor`` is to get an intermediate
+knowledge of ``trio`` and **structured concurrency** B)
+
+Some great places to start are,
+
+- the seminal `blog post`_
+- obviously the `trio docs`_
+- wikipedia's nascent SC_ page
+- the fancy diagrams @ libdill-docs_
 
-  https://goodboy.github.io/tractor/start/quickstart.html
 
 Features
 --------
@@ -52,7 +57,6 @@ Features
   `discovery`_ sys with plans to support multiple `modern protocol`_
   approaches.
 - Various ``trio`` extension APIs via ``tractor.trionics`` such as,
-
   - task fan-out `broadcasting`_,
   - multi-task-single-resource-caching and fan-out-to-multi
     ``__aenter__()`` APIs for ``@acm`` functions,
@@ -94,7 +98,7 @@ the code base::
 
     # but @goodboy prefers the more explicit (and shell agnostic)
     # https://docs.astral.sh/uv/configuration/environment/#uv_project_environment
-    UV_PROJECT_ENVIRONMENT="tractor_py313"
+    UV_PROJECT_ENVIRONMENT="tractor_py313
 
     # hint hint, enter @goodboy's fave shell B)
     uv run --dev xonsh
@@ -106,53 +110,546 @@ Alongside all this we ofc offer "releases" on PyPi::
 Just note that YMMV since the main git branch is often much further
 ahead then any latest release.
 
-Hacking on the docs themselves? The build + live-preview one-liners
-(incl. nix-shell specifics) are collected in `notes_to_self/howtodocs.md
-<https://github.com/goodboy/tractor/blob/main/notes_to_self/howtodocs.md>`_,
-and rendered as the "Building these docs" section of our dev-tips guide.
-
 
 Example codez
 -------------
-We prefer to point you at the runnable scripts under ``examples/``
-- each is CI-run and ``literalinclude``-d straight into the docs, so
-what you read there is what actually runs - rather than inline a
-pile of them here. The one-minute pitch: spawn a subactor per core,
-open a ``Context`` into each, then crash the root *on purpose* and
-watch the runtime reap the whole tree - zero zombies, guaranteed (if
-you can make a zombie child without a system signal, it **is a
-bug**).
+In ``tractor``'s (very lacking) documention we prefer to point to
+example scripts in the repo over duplicating them in docs, but with
+that in mind here are some definitive snippets to try and hook you
+into digging deeper.
 
-See it run - plus the full tour (the flagship multi-process
-debugger, bidirectional streaming over a ``Context``, cancellation,
-discovery, "infected ``asyncio``", typed messaging and worker-pool /
-cluster patterns) - in the docs:
 
-- docs: https://goodboy.github.io/tractor/
-- examples: https://github.com/goodboy/tractor/tree/main/examples
+Run a func in a process
+***********************
+Use ``trio``'s style of focussing on *tasks as functions*:
+
+.. code:: python
+
+    """
+    Run with a process monitor from a terminal using::
+
+        $TERM -e watch -n 0.1  "pstree -a $$" \
+            & python examples/parallelism/single_func.py \
+            && kill $!
+
+    """
+    import os
+
+    import tractor
+    import trio
+
+
+    async def burn_cpu():
+
+        pid = os.getpid()
+
+        # burn a core @ ~ 50kHz
+        for _ in range(50000):
+            await trio.sleep(1/50000/50)
+
+        return os.getpid()
+
+
+    async def main():
+
+        async with tractor.open_nursery() as n:
+
+            portal = await n.run_in_actor(burn_cpu)
+
+            #  burn rubber in the parent too
+            await burn_cpu()
+
+            # wait on result from target function
+            pid = await portal.result()
+
+        # end of nursery block
+        print(f"Collected subproc {pid}")
+
+
+    if __name__ == '__main__':
+        trio.run(main)
+
+
+This runs ``burn_cpu()`` in a new process and reaps it on completion
+of the nursery block.
+
+If you only need to run a sync function and retreive a single result, you
+might want to check out `trio-parallel`_.
+
+
+Zombie safe: self-destruct a process tree
+*****************************************
+``tractor`` tries to protect you from zombies, no matter what.
+
+.. code:: python
+
+    """
+    Run with a process monitor from a terminal using::
+
+        $TERM -e watch -n 0.1  "pstree -a $$" \
+            & python examples/parallelism/we_are_processes.py \
+            && kill $!
+
+    """
+    from multiprocessing import cpu_count
+    import os
+
+    import tractor
+    import trio
+
+
+    async def target():
+        print(
+            f"Yo, i'm '{tractor.current_actor().name}' "
+            f"running in pid {os.getpid()}"
+        )
+
+        await trio.sleep_forever()
+
+
+    async def main():
+
+        async with tractor.open_nursery() as n:
+
+            for i in range(cpu_count()):
+                await n.run_in_actor(target, name=f'worker_{i}')
+
+            print('This process tree will self-destruct in 1 sec...')
+            await trio.sleep(1)
+
+            # raise an error in root actor/process and trigger
+            # reaping of all minions
+            raise Exception('Self Destructed')
+
+
+    if __name__ == '__main__':
+        try:
+            trio.run(main)
+        except Exception:
+            print('Zombies Contained')
+
+
+If you can create zombie child processes (without using a system signal)
+it **is a bug**.
+
+
+"Native" multi-process debugging
+********************************
+Using the magic of `pdbp`_ and our internal IPC, we've
+been able to create a native feeling debugging experience for
+any (sub-)process in your ``tractor`` tree.
+
+.. code:: python
+
+    from os import getpid
+
+    import tractor
+    import trio
+
+
+    async def breakpoint_forever():
+        "Indefinitely re-enter debugger in child actor."
+        while True:
+            yield 'yo'
+            await tractor.breakpoint()
+
+
+    async def name_error():
+        "Raise a ``NameError``"
+        getattr(doggypants)
+
+
+    async def main():
+        """Test breakpoint in a streaming actor.
+        """
+        async with tractor.open_nursery(
+            debug_mode=True,
+            loglevel='error',
+        ) as n:
+
+            p0 = await n.start_actor('bp_forever', enable_modules=[__name__])
+            p1 = await n.start_actor('name_error', enable_modules=[__name__])
+
+            # retreive results
+            stream = await p0.run(breakpoint_forever)
+            await p1.run(name_error)
+
+
+    if __name__ == '__main__':
+        trio.run(main)
+
+
+You can run this with::
+
+    >>> python examples/debugging/multi_daemon_subactors.py
+
+And, yes, there's a built-in crash handling mode B)
+
+We're hoping to add a respawn-from-repl system soon!
+
+
+SC compatible bi-directional streaming
+**************************************
+Yes, you saw it here first; we provide 2-way streams
+with reliable, transitive setup/teardown semantics.
+
+Our nascent api is remniscent of ``trio.Nursery.start()``
+style invocation:
+
+.. code:: python
+
+    import trio
+    import tractor
+
+
+    @tractor.context
+    async def simple_rpc(
+
+        ctx: tractor.Context,
+        data: int,
+
+    ) -> None:
+        '''Test a small ping-pong 2-way streaming server.
+
+        '''
+        # signal to parent that we're up much like
+        # ``trio_typing.TaskStatus.started()``
+        await ctx.started(data + 1)
+
+        async with ctx.open_stream() as stream:
+
+            count = 0
+            async for msg in stream:
+
+                assert msg == 'ping'
+                await stream.send('pong')
+                count += 1
+
+            else:
+                assert count == 10
+
+
+    async def main() -> None:
+
+        async with tractor.open_nursery() as n:
+
+            portal = await n.start_actor(
+                'rpc_server',
+                enable_modules=[__name__],
+            )
+
+            # XXX: this syntax requires py3.9
+            async with (
+
+                portal.open_context(
+                    simple_rpc,
+                    data=10,
+                ) as (ctx, sent),
+
+                ctx.open_stream() as stream,
+            ):
+
+                assert sent == 11
+
+                count = 0
+                # receive msgs using async for style
+                await stream.send('ping')
+
+                async for msg in stream:
+                    assert msg == 'pong'
+                    await stream.send('ping')
+                    count += 1
+
+                    if count >= 9:
+                        break
+
+
+            # explicitly teardown the daemon-actor
+            await portal.cancel_actor()
+
+
+    if __name__ == '__main__':
+        trio.run(main)
+
+
+See original proposal and discussion in `#53`_ as well
+as follow up improvements in `#223`_ that we'd love to
+hear your thoughts on!
+
+.. _#53: https://github.com/goodboy/tractor/issues/53
+.. _#223: https://github.com/goodboy/tractor/issues/223
+
+
+Worker poolz are easy peasy
+***************************
+The initial ask from most new users is *"how do I make a worker
+pool thing?"*.
+
+``tractor`` is built to handle any SC (structured concurrent) process
+tree you can imagine; a "worker pool" pattern is a trivial special
+case.
+
+We have a `full worker pool re-implementation`_ of the std-lib's
+``concurrent.futures.ProcessPoolExecutor`` example for reference.
+
+You can run it like so (from this dir) to see the process tree in
+real time::
+
+    $TERM -e watch -n 0.1  "pstree -a $$" \
+        & python examples/parallelism/concurrent_actors_primes.py \
+        && kill $!
+
+This uses no extra threads, fancy semaphores or futures; all we need
+is ``tractor``'s IPC!
+
+"Infected ``asyncio``" mode
+***************************
+Have a bunch of ``asyncio`` code you want to force to be SC at the process level?
+
+Check out our experimental system for `guest`_-mode controlled
+``asyncio`` actors:
+
+.. code:: python
+
+    import asyncio
+    from statistics import mean
+    import time
+
+    import trio
+    import tractor
+
+
+    async def aio_echo_server(
+        chan: tractor.to_asyncio.LinkedTaskChannel,
+    ) -> None:
+
+        # a first message must be sent **from** this ``asyncio``
+        # task or the ``trio`` side will never unblock from
+        # ``tractor.to_asyncio.open_channel_from():``
+        chan.started_nowait('start')
+
+        while True:
+            # echo the msg back
+            chan.send_nowait(await chan.get())
+            await asyncio.sleep(0)
+
+
+    @tractor.context
+    async def trio_to_aio_echo_server(
+        ctx: tractor.Context,
+    ):
+        # this will block until the ``asyncio`` task sends a "first"
+        # message.
+        async with tractor.to_asyncio.open_channel_from(
+            aio_echo_server,
+        ) as (chan, first):
+
+            assert first == 'start'
+            await ctx.started(first)
+
+            async with ctx.open_stream() as stream:
+
+                async for msg in stream:
+                    await chan.send(msg)
+
+                    out = await chan.receive()
+                    # echo back to parent actor-task
+                    await stream.send(out)
+
+
+    async def main():
+
+        async with tractor.open_nursery() as n:
+            p = await n.start_actor(
+                'aio_server',
+                enable_modules=[__name__],
+                infect_asyncio=True,
+            )
+            async with p.open_context(
+                trio_to_aio_echo_server,
+            ) as (ctx, first):
+
+                assert first == 'start'
+
+                count = 0
+                async with ctx.open_stream() as stream:
+
+                    delays = []
+                    send = time.time()
+
+                    await stream.send(count)
+                    async for msg in stream:
+                        recv = time.time()
+                        delays.append(recv - send)
+                        assert msg == count
+                        count += 1
+                        send = time.time()
+                        await stream.send(count)
+
+                        if count >= 1e3:
+                            break
+
+            print(f'mean round trip rate (Hz): {1/mean(delays)}')
+            await p.cancel_actor()
+
+
+    if __name__ == '__main__':
+        trio.run(main)
+
+
+Yes, we spawn a python process, run ``asyncio``, start ``trio`` on the
+``asyncio`` loop, then send commands to the ``trio`` scheduled tasks to
+tell ``asyncio`` tasks what to do XD
+
+The ``asyncio``-side task receives a single
+``chan: LinkedTaskChannel`` handle providing a ``trio``-like
+API: ``.started_nowait()``, ``.send_nowait()``, ``.get()``
+and more. Feel free to sling your opinion in `#273`_!
+
+
+.. _#273: https://github.com/goodboy/tractor/issues/273
+
+
+Higher level "cluster" APIs
+***************************
+To be extra terse the ``tractor`` devs have started hacking some "higher
+level" APIs for managing actor trees/clusters. These interfaces should
+generally be condsidered provisional for now but we encourage you to try
+them and provide feedback. Here's a new API that let's you quickly
+spawn a flat cluster:
+
+.. code:: python
+
+    import trio
+    import tractor
+
+
+    async def sleepy_jane():
+        uid = tractor.current_actor().uid
+        print(f'Yo i am actor {uid}')
+        await trio.sleep_forever()
+
+
+    async def main():
+        '''
+        Spawn a flat actor cluster, with one process per
+        detected core.
+
+        '''
+        portal_map: dict[str, tractor.Portal]
+        results: dict[str, str]
+
+        # look at this hip new syntax!
+        async with (
+
+            tractor.open_actor_cluster(
+                modules=[__name__]
+            ) as portal_map,
+
+            trio.open_nursery() as n,
+        ):
+
+            for (name, portal) in portal_map.items():
+                n.start_soon(portal.run, sleepy_jane)
+
+            await trio.sleep(0.5)
+
+            # kill the cluster with a cancel
+            raise KeyboardInterrupt
+
+
+    if __name__ == '__main__':
+        try:
+            trio.run(main)
+        except KeyboardInterrupt:
+            pass
+
+
+.. _full worker pool re-implementation: https://github.com/goodboy/tractor/blob/master/examples/parallelism/concurrent_actors_primes.py
+
 
 Under the hood
 --------------
-``tractor`` is an attempt to pair trionic_ `structured
-concurrency`_ with distributed Python - think of it as ``trio``
-*-across-processes*, or as an opinionated replacement for the
-stdlib's ``multiprocessing`` built on async primitives from the
-ground up. But really it **is just** ``trio``: nurseries that
-spawn *processes* and cancel-able streaming IPC between them. If
-you can drive ``trio``, you can drive ``tractor``.
+``tractor`` is an attempt to pair trionic_ `structured concurrency`_ with
+distributed Python. You can think of it as a ``trio``
+*-across-processes* or simply as an opinionated replacement for the
+stdlib's ``multiprocessing`` but built on async programming primitives
+from the ground up.
 
-"But wait - don't 'actors' have mailboxes and messages and
-stuff?!" Well, we've got (well referenced) opinions on what an "actor
-model" **actually is** (tl;dr: the `3 axioms`_, not the cultural
-baggage) - that whole riff lives in our docs:
+Don't be scared off by this description. ``tractor`` **is just** ``trio``
+but with nurseries for process management and cancel-able streaming IPC.
+If you understand how to work with ``trio``, ``tractor`` will give you
+the parallelism you may have been needing.
 
-  https://goodboy.github.io/tractor/explain/sc-distributed.html#hold-up-is-this-an-actor-model
 
-What's on the TODO
-------------------
-The roadmap lives with our docs - see `what the future holds
-<https://goodboy.github.io/tractor/project/index.html#what-the-future-holds>`_
-for where ``tractor`` is headed.
+Wait, huh?! I thought "actors" have messages, and mailboxes and stuff?!
+***********************************************************************
+Let's stop and ask how many canon actor model papers have you actually read ;)
+
+From our experience many "actor systems" aren't really "actor models"
+since they **don't adhere** to the `3 axioms`_ and pay even less
+attention to the problem of *unbounded non-determinism* (which was the
+whole point for creation of the model in the first place).
+
+From the author's mouth, **the only thing required** is `adherance to`_
+the `3 axioms`_, *and that's it*.
+
+``tractor`` adheres to said base requirements of an "actor model"::
+
+    In response to a message, an actor may:
+
+    - send a finite number of new messages
+    - create a finite number of new actors
+    - designate a new behavior to process subsequent messages
+
+
+**and** requires *no further api changes* to accomplish this.
+
+If you want do debate this further please feel free to chime in on our
+chat or discuss on one of the following issues *after you've read
+everything in them*:
+
+- https://github.com/goodboy/tractor/issues/210
+- https://github.com/goodboy/tractor/issues/18
+
+
+Let's clarify our parlance
+**************************
+Whether or not ``tractor`` has "actors" underneath should be mostly
+irrelevant to users other then for referring to the interactions of our
+primary runtime primitives: each Python process + ``trio.run()``
++ surrounding IPC machinery. These are our high level, base
+*runtime-units-of-abstraction* which both *are* (as much as they can
+be in Python) and will be referred to as our *"actors"*.
+
+The main goal of ``tractor`` is is to allow for highly distributed
+software that, through the adherence to *structured concurrency*,
+results in systems which fail in predictable, recoverable and maybe even
+understandable ways; being an "actor model" is just one way to describe
+properties of the system.
+
+
+What's on the TODO:
+-------------------
+Help us push toward the future of distributed `Python`.
+
+- Erlang-style supervisors via composed context managers (see `#22
+  <https://github.com/goodboy/tractor/issues/22>`_)
+- Typed messaging protocols (ex. via ``msgspec.Struct``, see `#36
+  <https://github.com/goodboy/tractor/issues/36>`_)
+- Typed capability-based (dialog) protocols ( see `#196
+  <https://github.com/goodboy/tractor/issues/196>`_ with draft work
+  started in `#311 <https://github.com/goodboy/tractor/pull/311>`_)
+- **macOS is now officially supported** and tested in CI
+  alongside Linux!
+- We **recently disabled CI-testing on windows** and need
+  help getting it running again! (see `#327
+  <https://github.com/goodboy/tractor/pull/327>`_). **We do
+  have windows support** (and have for quite a while) but
+  since no active hacker exists in the user-base to help
+  test on that OS, for now we're not actively maintaining
+  testing due to the added hassle and general latency..
+
 
 Feel like saying hi?
 --------------------
@@ -163,24 +660,36 @@ say hi, please feel free to reach us in our `matrix channel`_.  If
 matrix seems too hip, we're also mostly all in the the `trio gitter
 channel`_!
 
+.. _structured concurrent: https://trio.discourse.group/t/concise-definition-of-structured-concurrency/228
 .. _distributed: https://en.wikipedia.org/wiki/Distributed_computing
 .. _multi-processing: https://en.wikipedia.org/wiki/Multiprocessing
 .. _trio: https://github.com/python-trio/trio
 .. _nurseries: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/#nurseries-a-structured-replacement-for-go-statements
 .. _actor model: https://en.wikipedia.org/wiki/Actor_model
 .. _trionic: https://trio.readthedocs.io/en/latest/design.html#high-level-design-principles
+.. _async sandwich: https://trio.readthedocs.io/en/latest/tutorial.html#async-sandwich
 .. _3 axioms: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=162s
 .. .. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts
+.. _adherance to: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=1821s
 .. _trio gitter channel: https://gitter.im/python-trio/general
 .. _matrix channel: https://matrix.to/#/!tractor:matrix.org
 .. _broadcasting: https://github.com/goodboy/tractor/pull/229
+.. _modern procotol: https://en.wikipedia.org/wiki/Rendezvous_protocol
 .. _pdbp: https://github.com/mdmintz/pdbp
 .. _pdb++: https://github.com/pdbpp/pdbpp
 .. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
 .. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
 .. _discovery: https://zguide.zeromq.org/docs/chapter8/#Discovery
 .. _modern protocol: https://en.wikipedia.org/wiki/Rendezvous_protocol
+.. _messages: https://en.wikipedia.org/wiki/Message_passing
+.. _trio docs: https://trio.readthedocs.io/en/latest/
+.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
 .. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html
+.. _unrequirements: https://en.wikipedia.org/wiki/Actor_model#Direct_communication_and_asynchrony
+.. _async generators: https://www.python.org/dev/peps/pep-0525/
+.. _trio-parallel: https://github.com/richardsheridan/trio-parallel
 .. _uv: https://docs.astral.sh/uv/
 .. _msgspec: https://jcristharif.com/msgspec/
 .. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops
@@ -191,10 +700,10 @@ channel`_!
 .. |gh_actions| image:: https://github.com/goodboy/tractor/actions/workflows/ci.yml/badge.svg?branch=main
     :target: https://github.com/goodboy/tractor/actions/workflows/ci.yml
 
-.. |docs| image:: https://github.com/goodboy/tractor/actions/workflows/docs.yml/badge.svg?branch=main
-    :target: https://goodboy.github.io/tractor/
-    :alt: Documentation
+.. |docs| image:: https://readthedocs.org/projects/tractor/badge/?version=latest
+    :target: https://tractor.readthedocs.io/en/latest/?badge=latest
+    :alt: Documentation Status
 
-.. |logo| image:: _static/tractor_logo_wire.svg
+.. |logo| image:: _static/tractor_logo_side.svg
     :width: 250
     :align: middle

docs/_ext/d2diagrams.py

@@ -1,387 +0,0 @@
-# tractor: distributed structured concurrency.
-'''
-``.. d2::`` - embed d2lang_ diagrams in sphinx docs
-with build-time rendering and a committed-SVG
-fallback.
-
-Rendering policy,
-
-- when a ``d2`` binary is found (see discovery order
-  below) any out-of-date SVG is (re)rendered from its
-  ``.d2`` source (normally kept in ``docs/diagrams/``)
-  into ``docs/_diagrams/``,
-- otherwise any pre-rendered (and git committed) SVG
-  already in ``docs/_diagrams/`` is used as-is,
-- when neither is possible the diagram *source* is
-  emitted as a literal block so no content is ever
-  silently dropped.
-
-A render that is *attempted and fails* (a ``d2`` bin is
-present but errors on the source) is NOT silently
-degraded to the stale committed SVG: it raises a
-docutils error (so ``sphinx-build -W`` fails the
-build). The render is also atomic — a failed/torn
-render can never clobber a good committed SVG — so the
-last-good diagram survives a bad edit.
-
-Binary discovery order,
-
-- the ``D2_BIN`` env var; may contain args which are
-  split via `shlex`, eg.
-  ``D2_BIN='nix run nixpkgs#d2 --'``,
-- the ``d2_bin`` sphinx config value,
-- ``shutil.which('d2')``.
-
-Usage,
-
-.. code:: rst
-
-    .. d2:: diagrams/actor_tree.d2
-       :caption: A tree of ``trio``-task-trees.
-       :margin:
-
-.. _d2lang: https://d2lang.com
-
-'''
-from __future__ import annotations
-
-import enum
-import hashlib
-import os
-from pathlib import Path
-import re
-import shlex
-import shutil
-import subprocess as sp
-import tempfile
-
-from docutils import nodes
-from docutils.parsers.rst import directives
-from sphinx.application import Sphinx
-from sphinx.util import logging
-from sphinx.util.docutils import SphinxDirective
-
-log = logging.getLogger(__name__)
-
-# subdir (under the sphinx srcdir) holding rendered,
-# git-committed, fallback SVG outputs.
-_outdir: str = '_diagrams'
-
-# per-build map of {output-svg-name: source-relpath} used
-# to detect 2 distinct `.d2` sources colliding on a single
-# output stem; reset on each `builder-inited` (see `setup`).
-_seen_outputs: dict[str, str] = {}
-
-
-class RenderResult(enum.Enum):
-    '''
-    Outcome of a `render_svg()` call.
-
-    '''
-    OK = 'ok'                # fresh SVG exists on disk
-    FELL_BACK = 'fell_back'  # no bin; serving committed SVG
-    NO_OUTPUT = 'no_output'  # no bin AND no committed SVG
-    FAILED = 'failed'        # bin present, render errored
-
-
-def find_d2(
-    app: Sphinx,
-) -> list[str]|None:
-    '''
-    Resolve the d2 render command as an argv list or
-    `None` when no binary can be found.
-
-    '''
-    if env_bin := os.environ.get('D2_BIN'):
-        return shlex.split(env_bin)
-    if cfg_bin := app.config.d2_bin:
-        return shlex.split(cfg_bin)
-    if path_bin := shutil.which('d2'):
-        return [path_bin]
-    return None
-
-
-def render_svg(
-    app: Sphinx,
-    src: Path,
-    out: Path,
-) -> RenderResult:
-    '''
-    Maybe (re)render `src` -> `out` and report the
-    outcome as a `RenderResult`.
-
-    A render is performed only when `out` is missing or
-    older than `src` AND a `d2` binary is available. The
-    write is atomic (temp-file + `os.replace`) so a
-    failed or torn render never clobbers an existing
-    (committed) SVG.
-
-    '''
-    fresh: bool = (
-        out.exists()
-        and
-        src.stat().st_mtime <= out.stat().st_mtime
-    )
-    if fresh:
-        return RenderResult.OK
-    d2cmd: list[str]|None = find_d2(app)
-    if d2cmd is None:
-        # no binary: fall back to whatever is committed,
-        # else signal the caller to emit the raw source.
-        if out.exists():
-            log.info(
-                f'no d2 binary; using committed svg '
-                f'for {src.name}'
-            )
-            return RenderResult.FELL_BACK
-        return RenderResult.NO_OUTPUT
-    out.parent.mkdir(
-        parents=True,
-        exist_ok=True,
-    )
-    # render into a sibling temp-file first so a bad
-    # `d2` exit (or a crash mid-write) leaves any prior
-    # committed SVG fully intact.
-    fd, tmpname = tempfile.mkstemp(
-        dir=str(out.parent),
-        prefix=f'.{out.stem}.',
-        suffix='.svg.tmp',
-    )
-    os.close(fd)
-    tmp = Path(tmpname)
-    argv: list[str] = (
-        d2cmd
-        + list(app.config.d2_args)
-        + [str(src), str(tmp)]
-    )
-    try:
-        proc = sp.run(
-            argv,
-            capture_output=True,
-            text=True,
-            timeout=120,
-        )
-    except (
-        OSError,
-        sp.TimeoutExpired,
-    ) as err:
-        tmp.unlink(missing_ok=True)
-        log.warning(
-            f'd2 invocation failed for {src.name}: '
-            f'{err}'
-        )
-        return RenderResult.FAILED
-    if proc.returncode != 0:
-        tmp.unlink(missing_ok=True)
-        log.warning(
-            f'd2 render error for {src.name}:\n'
-            f'{proc.stderr}'
-        )
-        return RenderResult.FAILED
-    # atomic swap-in of the freshly rendered SVG.
-    os.replace(tmp, out)
-    return RenderResult.OK
-
-
-class D2Diagram(SphinxDirective):
-    '''
-    Render a ``.d2`` source file (path relative to
-    the sphinx srcdir) as an SVG figure.
-
-    '''
-    required_arguments = 1
-    has_content = False
-    option_spec = {
-        'caption': directives.unchanged,
-        'alt': directives.unchanged,
-        'width': (
-            directives.length_or_percentage_or_unitless
-        ),
-        'margin': directives.flag,
-        'class': directives.class_option,
-        'name': directives.unchanged,
-    }
-
-    def run(self) -> list[nodes.Node]:
-        relsrc: str = self.arguments[0]
-        srcdir = Path(self.env.srcdir)
-        src: Path = srcdir / relsrc
-        self.env.note_dependency(relsrc)
-        if not src.exists():
-            err = self.state_machine.reporter.error(
-                f'd2 source not found: {relsrc}',
-                line=self.lineno,
-            )
-            return [err]
-        out: Path = (
-            srcdir
-            / _outdir
-            / f'{src.stem}.svg'
-        )
-        # collision guard: two distinct sources must not
-        # map onto the same output stem within a build.
-        prior: str|None = _seen_outputs.get(out.name)
-        if (
-            prior is not None
-            and
-            prior != relsrc
-        ):
-            err = self.state_machine.reporter.error(
-                f'd2 output collision: {relsrc!r} and '
-                f'{prior!r} both render to '
-                f'{_outdir}/{out.name}; rename one '
-                f'`.d2` stem',
-                line=self.lineno,
-            )
-            return [err]
-        _seen_outputs[out.name] = relsrc
-
-        result: RenderResult = render_svg(
-            self.env.app,
-            src,
-            out,
-        )
-        if result is RenderResult.FAILED:
-            # loud, build-failing (under `-W`) signal; the
-            # prior committed SVG, if any, is untouched.
-            err = self.state_machine.reporter.error(
-                f'd2 render failed for {relsrc} (see '
-                f'build log); the committed svg, if any, '
-                f'was left untouched',
-                line=self.lineno,
-            )
-            return [err]
-        if result is RenderResult.NO_OUTPUT:
-            # last resort: emit the raw d2 source so no
-            # content is ever silently dropped.
-            log.warning(
-                f'no svg available for {relsrc}; '
-                f'emitting d2 source as literal block'
-            )
-            src_text: str = src.read_text()
-            literal = nodes.literal_block(
-                src_text,
-                src_text,
-            )
-            literal['language'] = 'text'
-            return [literal]
-        # OK | FELL_BACK -> embed the SVG figure.
-        img = nodes.image(
-            uri=f'/{_outdir}/{out.name}',
-            alt=self.options.get(
-                'alt',
-                f'd2 diagram: {src.stem}',
-            ),
-        )
-        if width := self.options.get('width'):
-            img['width'] = width
-        # content-hash the rendered svg so the served
-        # `<img src>` carries a `?v=<hash>` cache-buster
-        # (sphinx tags css/js this way but not images);
-        # without it an edited diagram keeps showing the
-        # browser's stale copy at the stable
-        # `_images/<stem>.svg` url on autobuild reload.
-        if out.exists():
-            img['d2_stem'] = out.stem
-            img['d2_cachebust'] = hashlib.sha256(
-                out.read_bytes()
-            ).hexdigest()[:8]
-        fig = nodes.figure()
-        fig += img
-        classes: list[str] = (
-            ['d2-diagram']
-            + self.options.get('class', [])
-        )
-        if 'margin' in self.options:
-            # NB: the bare 'margin' class is what
-            # book-style themes key off for
-            # right-margin placement; our custom css
-            # uses 'd2-margin'.
-            classes += [
-                'margin',
-                'd2-margin',
-            ]
-        fig['classes'] += classes
-        if caption_txt := self.options.get('caption'):
-            (
-                inline_nodes,
-                _msgs,
-            ) = self.state.inline_text(
-                caption_txt,
-                self.lineno,
-            )
-            caption = nodes.caption(
-                caption_txt,
-                '',
-                *inline_nodes,
-            )
-            fig += caption
-        self.add_name(fig)
-        return [fig]
-
-
-def _reset_seen(
-    app: Sphinx,
-) -> None:
-    '''
-    Clear the per-build output-collision map at the
-    start of each build.
-
-    '''
-    _seen_outputs.clear()
-
-
-def _cachebust_d2_images(
-    app: Sphinx,
-    pagename: str,
-    templatename: str,
-    context: dict,
-    doctree,
-) -> None:
-    '''
-    Append a ``?v=<content-hash>`` query to every d2
-    diagram ``<img src>`` in the rendered page ``body``
-    so a browser re-fetches an *edited* SVG instead of
-    its stale cached copy at the stable
-    ``_images/<stem>.svg`` url (sphinx cache-busts
-    css/js this way, but not images).
-
-    Scoped strictly to d2 images (those carrying the
-    `d2_cachebust` attr set in `D2Diagram.run()`); all
-    other markup is left untouched.
-
-    '''
-    if doctree is None or 'body' not in context:
-        return
-    busts: dict[str, str] = {}
-    for img in doctree.findall(nodes.image):
-        if ver := img.get('d2_cachebust'):
-            busts[img['d2_stem']] = ver
-    if not busts:
-        return
-    body: str = context['body']
-    for stem, ver in busts.items():
-        body = re.sub(
-            r'(src="[^"]*?' + re.escape(stem) + r'\.svg)(")',
-            rf'\1?v={ver}\2',
-            body,
-        )
-    context['body'] = body
-
-
-def setup(app: Sphinx) -> dict:
-    app.add_config_value('d2_bin', None, 'env')
-    app.add_config_value('d2_args', [], 'env')
-    app.add_directive('d2', D2Diagram)
-    app.connect('builder-inited', _reset_seen)
-    app.connect('html-page-context', _cachebust_d2_images)
-    return {
-        'version': '0.1.0',
-        # NB: run() writes the rendered SVG during the
-        # READ phase; the temp-file + `os.replace` swap
-        # keeps that atomic so concurrent renders of the
-        # same diagram (under `sphinx-build -j`) can't
-        # tear the output file.
-        'parallel_read_safe': True,
-        'parallel_write_safe': True,
-    }

docs/_ext/marginalia.py

@@ -1,51 +0,0 @@
-# tractor: distributed structured concurrency.
-'''
-``.. margin::`` - prose-anchored, right-margin asides.
-
-A theme-agnostic vendoring of `sphinx_book_theme`'s
-`Margin` directive: a `docutils` `Sidebar` subclass
-which tags the node with a ``margin`` class; placement
-is then pure CSS (see ``_static/css/custom.css``)
-allowing use on any theme incl. our
-`pydata_sphinx_theme`.
-
-Usage,
-
-.. code:: rst
-
-    .. margin:: An optional title
-
-       Aside content; text, figures, whatever.
-
-'''
-from docutils import nodes
-from docutils.parsers.rst.directives.body import (
-    Sidebar,
-)
-from sphinx.application import Sphinx
-
-
-class Margin(Sidebar):
-    '''
-    Notes/figures placed in the right margin, anchored
-    at the current point in the prose flow.
-
-    '''
-    required_arguments = 0
-    optional_arguments = 1
-
-    def run(self) -> list[nodes.Node]:
-        if not self.arguments:
-            self.arguments = ['']
-        out: list[nodes.Node] = super().run()
-        out[0].attributes['classes'].append('margin')
-        return out
-
-
-def setup(app: Sphinx) -> dict:
-    app.add_directive('margin', Margin)
-    return {
-        'version': '0.1.0',
-        'parallel_read_safe': True,
-        'parallel_write_safe': True,
-    }

docs/_static/css/custom.css

@@ -1,185 +0,0 @@
-/* tractor docs: a minimal black + white skin over
- * `pydata-sphinx-theme` plus RHS-marginalia + d2
- * diagram styling.
- */
-html[data-theme="light"] {
-  --pst-color-primary: #000000;
-  --pst-color-secondary: #3d3d3d;
-  --pst-color-accent: #5a5a5a;
-  --pst-color-link: #000000;
-  --pst-color-link-hover: #5a5a5a;
-  --pst-color-inline-code: #1a1a1a;
-  --pst-color-inline-code-links: #000000;
-}
-html[data-theme="dark"] {
-  --pst-color-primary: #ffffff;
-  --pst-color-secondary: #c9c9c9;
-  --pst-color-accent: #a8a8a8;
-  --pst-color-link: #ffffff;
-  --pst-color-link-hover: #bdbdbd;
-  --pst-color-inline-code: #e8e8e8;
-  --pst-color-inline-code-links: #ffffff;
-}
-/* mono-chrome links: rely on underline for
- * affordance instead of color.
- */
-.bd-content a:not(.headerlink) {
-  text-decoration: underline;
-  text-underline-offset: 0.18em;
-}
-/* d2 diagram figures */
-figure.d2-diagram {
-  text-align: center;
-}
-figure.d2-diagram img {
-  max-width: 100%;
-  height: auto;
-}
-/* keep light-rendered svgs legible in dark mode */
-html[data-theme="dark"] figure.d2-diagram img {
-  background: #ffffff;
-  border-radius: 6px;
-  padding: 6px;
-}
-/* prose-anchored right-margin asides (tufte-ish):
- * float right within the content column on wide
- * screens, collapse inline on narrow ones.
- */
-@media (min-width: 960px) {
-  aside.margin,
-  figure.margin,
-  div.margin,
-  figure.d2-margin {
-    float: right;
-    clear: right;
-    width: 44%;
-    margin: 0.2rem 0 1rem 1.4rem;
-    font-size: 0.85rem;
-  }
-}
-/* strip docutils sidebar chrome from margin asides */
-aside.sidebar.margin {
-  border: none;
-  background: transparent;
-  padding: 0;
-}
-aside.sidebar.margin > p.sidebar-title {
-  font-weight: 600;
-  font-size: 0.9rem;
-  margin-bottom: 0.3rem;
-}
-/* landing-page hero logo (inline svg): the linework uses
- * `fill: currentColor` so it inherits the theme text colour
- * (auto-flips light<->dark), and the faces are transparent so
- * the page background shows through. */
-svg.hero-logo {
-  display: block;
-  max-width: 360px;
-  height: auto;
-  color: var(--pst-color-text-base);
-}
-/* 3-up landing hero row: name | logo | tagline, with a centered
- * sub-tagline beneath. */
-.hero-row {
-  display: flex;
-  align-items: center;
-  /* left-anchored single row; tighter gap so the logo sits over
-   * the sub-line and the tagline over the prose below it (stack
-   * only on mobile, via the media query). */
-  justify-content: flex-start;
-  flex-wrap: nowrap;
-  gap: clamp(0.5rem, 2vw, 1.5rem);
-  margin: 0 0 0.25rem;
-}
-.hero-row svg.hero-logo {
-  /* override the stacked-hero sizing for the inline row */
-  width: clamp(240px, 34vw, 360px);
-  margin: 0;
-}
-.hero-row .hero-tag {
-  margin: 0;
-  /* keep it on a single line beside the logo */
-  max-width: none;
-  white-space: nowrap;
-  font-size: clamp(1rem, 2.1vw, 1.4rem);
-  font-weight: 400;
-  line-height: 1.15;
-  color: var(--pst-color-text-base);
-}
-.hero-row .hero-tag {
-  min-width: 0;
-}
-.hero-sub {
-  /* wrap at the prose width (not the logo's), with a line of
-   * space before the prose section below. */
-  margin: 0 0 4rem;
-  max-width: none;
-  text-align: left;
-  font-size: 1.05rem;
-  color: var(--pst-color-text-muted);
-}
-/* the page carries a single rst <h1> ("tractor") for semantics
- * + SEO, but the visual title is the hero — so hide the doc
- * title accessibly (still read by screen readers + search). */
-#tractor > h1 {
-  position: absolute !important;
-  width: 1px;
-  height: 1px;
-  margin: -1px;
-  padding: 0;
-  overflow: hidden;
-  clip: rect(0 0 0 0);
-  clip-path: inset(50%);
-  white-space: nowrap;
-  border: 0;
-}
-/* smaller section headings on the landing only */
-#sixty-seconds-of-why > :is(h1, h2),
-#dig-in > :is(h1, h2),
-#features > :is(h1, h2),
-#where-do-i-start > :is(h1, h2) {
-  font-size: 1.75rem;
-}
-/* extra breathing room before the first landing section */
-#sixty-seconds-of-why {
-  margin-top: 4rem;
-}
-/* pull the section's `tl;dr` margin-note up so its top edge is
- * level with the heading (default floats it beside the body). */
-#sixty-seconds-of-why aside.margin {
-  margin-top: -3.75rem;
-}
-/* stack the 3-up hero only on real mobile */
-@media (max-width: 640px) {
-  .hero-row {
-    flex-direction: column;
-  }
-  .hero-row .hero-tag {
-    max-width: none;
-  }
-}
-/* navbar brand: the "distributed SC" tagline next to the logo
- * (the logo `text` value), kept small + muted like a sub-line. */
-.navbar-brand .title {
-  /* match the centered nav tabs (Bootstrap leaves the nav-link
-   * size/weight vars empty → ~1rem / normal); `inline-block` is
-   * the real underline fix — it stops the parent brand-link's
-   * :hover underline from propagating onto the text (a block
-   * child's `text-decoration:none` can't cancel an ancestor's
-   * underline). */
-  display: inline-block;
-  font-size: 1rem;
-  font-weight: 400;
-  text-decoration: none;
-}
-/* it's a brand mark, not a content link — never underline the
- * brand text (base / hover / focus). */
-.navbar-brand,
-.navbar-brand:hover,
-.navbar-brand:focus,
-.navbar-brand:visited:hover,
-.navbar-brand .title,
-.navbar-brand:hover .title {
-  text-decoration: none !important;
-  border-bottom: 0 !important;
-}

docs/_static/tractor_hero.html

@@ -1,462 +0,0 @@
-<div class="hero-row">
-  <svg class="hero-logo" role="img" aria-label="tractor" version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 2670 1980" style="enable-background:new 0 0 2670 1980;" xml:space="preserve">
-<style type="text/css">
-	.st0{fill:currentColor;}
-	.st1{fill:none;}
-</style>
-<g>
-	<path class="st0" d="M2275.3,1000.1c-0.1,2.3,0,4.7,0,7c0,189.3,0,378.7,0,568c0,6,0.1,12.1-0.8,17.9c-2.4,15.2-12.9,17.4-23.6,10
-		c-45.4-31-91.2-61.4-136.9-91.9l-30.1-20.3c-9.8-6.3-19.2-13.2-29.2-19.3c-6.7-4.1-9.8-9.7-9.9-17.2c-0.1-9.3-0.6-18.7-0.3-28
-		c0.2-7.3-1.7-13-6.5-19c-18.6-23.3-36.2-47.3-56.9-69c-18-18.8-36.7-36.8-56.4-53.8c-31.8-27.5-65.4-52.7-101-74.9
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-  <p class="hero-tag">distributed structured concurrency</p>
-</div>
-<p class="hero-sub">a multi-processing runtime built on (and shaped
-entirely like) <a class="reference external"
-href="https://github.com/python-trio/trio">trio</a>.</p>

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docs/api/context.rst

@@ -1,134 +0,0 @@
-Contexts and streaming
-======================
-
-The modern core of ``tractor``: a :class:`Context` links a task in
-one actor to a task in another as a *single* structured concurrency
-(SC) scope stretched across the IPC boundary — errors, results and
-cancellation flow between the pair `exactly like trio`_ tasks under
-a common `nursery`_. Open one with ``Portal.open_context()`` (see
-:func:`tractor._context.open_context_from_portal` in
-:doc:`/api/core`), then optionally bridge a bidirectional
-:class:`MsgStream` between the two tasks.
-
-.. d2:: diagrams/context_handshake.d2
-   :caption: The ``open_context()`` <-> ``ctx.started()`` handshake.
-   :margin:
-   :alt: parent and child actor context handshake sequence
-
-For the guided, example-driven tour see :doc:`/guide/context`; this
-page is the precise API surface.
-
-.. currentmodule:: tractor
-
-The ``@context`` decorator
---------------------------
-
-.. autofunction:: context
-
-.. note::
-
-   The decorated function **must** declare a parameter annotated
-   ``tractor.Context`` (any param name works); the runtime injects
-   the context instance there on each remote invocation. Pass
-   ``pld_spec`` to type-restrict (and validate) the payloads this
-   endpoint may shuttle — violations raise
-   :class:`MsgTypeError`. See ``examples/typed_payloads.py``.
-
-``Context``
------------
-
-.. autoclass:: Context
-   :members: started,
-             wait_for_result,
-             cancel,
-             cid,
-             chan,
-             side,
-             cancel_called,
-             cancelled_caught,
-             cancel_acked,
-             canceller,
-             maybe_error,
-             outcome
-
-.. deprecated:: 0.1.0a6
-
-   ``Context.result()`` warns; use :meth:`Context.wait_for_result`.
-
-.. note::
-
-   A :class:`Context` is **not** a :class:`trio.CancelScope`:
-   :meth:`Context.cancel` requests cancellation of the *remote*
-   peer task and does not cancel the local scope. If *you*
-   requested the cancel, the resulting :class:`ContextCancelled`
-   is absorbed at ``open_context()`` exit; a cancel originating
-   anywhere else (the peer, or a third-party actor recorded in
-   :attr:`ContextCancelled.canceller`) *is* raised locally. This
-   self-vs-cross-cancel rule is the key to writing correct
-   inter-actor teardown logic — see :doc:`/guide/context`.
-
-Bidirectional streaming
------------------------
-
-.. autofunction:: tractor._streaming.open_stream_from_ctx
-
-.. note::
-
-   :func:`~tractor._streaming.open_stream_from_ctx` is bound as
-   the **method-alias** ``Context.open_stream()`` — call it as
-   ``async with ctx.open_stream() as stream:``. Both sides of the
-   context must enter it for the dialog to be open.
-
-.. autoclass:: MsgStream
-   :members: send,
-             receive,
-             receive_nowait,
-             aclose,
-             subscribe,
-             ctx,
-             closed
-
-.. note::
-
-   A :class:`MsgStream` is one-shot use: once closed it can never
-   be "re-opened" — open a fresh :class:`Context` instead. Remote
-   end-of-stream surfaces as :class:`StopAsyncIteration` from
-   ``async for``; un-consumed sends overrun the receiver and raise
-   :class:`tractor._exceptions.StreamOverrun` unless the context
-   was opened with ``allow_overruns=True``.
-
-:meth:`MsgStream.subscribe` fans a single IPC stream out to
-multiple *local* tasks via a
-:class:`tractor.trionics.BroadcastReceiver` (see
-:doc:`/api/trionics`); the underlying allocation is idempotent and
-non-reversible for the stream's lifetime. See
-``examples/streaming_broadcast_fanout.py`` for the pattern in
-action.
-
-Legacy one-way streaming
-------------------------
-
-.. autofunction:: stream
-
-.. warning::
-
-   ``@tractor.stream`` and ``Portal.open_stream_from()`` are the
-   *legacy* one-way streaming API kept for backward compat: a
-   plain async-generator function streamed parent-ward with no
-   child-side receive leg. New code should use
-   ``@tractor.context`` + ``ctx.open_stream()`` (bidirectional,
-   SC-linked, typed). Note ``ctx`` is now a reserved param name
-   for ``@context`` endpoints — ``@stream`` functions must use
-   ``stream`` instead, and ``ctx.send_yield()`` is deprecated in
-   favor of :meth:`MsgStream.send`.
-
-.. seealso::
-
-   :doc:`/api/errors` for :class:`ContextCancelled` /
-   :class:`MsgTypeError` semantics, :doc:`/api/msg` for payload
-   typing via ``pld_spec`` and codecs, :doc:`/api/trionics` for
-   the broadcast fan-out machinery, and the guided tours in
-   :doc:`/guide/streaming` + :doc:`/guide/cancellation`.
-
-.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
-.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning

docs/api/core.rst

@@ -1,157 +0,0 @@
-Runtime and spawning
-====================
-
-The core lifecycle API: boot the runtime in your root process,
-spawn trio-"actors" (processes running ``trio.run()`` task trees)
-under a one-cancels-all supervisor, and talk to them through
-portals. This is structured concurrency (SC) applied *transitively*:
-every spawned process is owned by a nursery block and errors
-`always propagate`_. If you can create zombies it **is a bug**.
-
-.. currentmodule:: tractor
-
-Booting the runtime
--------------------
-
-.. autofunction:: open_root_actor
-
-.. note::
-
-   The env vars ``TRACTOR_LOGLEVEL`` and ``TRACTOR_SPAWN_METHOD``
-   override the ``loglevel`` / ``start_method`` params so you can
-   crank verbosity or swap spawn backends without touching app
-   code. Exactly **one** IPC transport may be enabled per actor
-   (see ``enable_transports`` and :doc:`/api/ipc`).
-
-.. autofunction:: run_daemon
-
-Spawning actors
----------------
-
-.. d2:: diagrams/actor_tree.d2
-   :caption: A supervised actor (process) tree.
-   :margin:
-   :alt: root actor supervising a tree of subactors
-
-.. autofunction:: open_nursery
-
-.. autoclass:: ActorNursery
-   :members: start_actor,
-             run_in_actor,
-             cancel,
-             cancel_called,
-             cancelled_caught
-
-.. note::
-
-   :meth:`ActorNursery.start_actor` (daemon actor + portal) is the
-   blessed spawning primitive; pair it with
-   ``Portal.open_context()`` for SC-linked remote tasks.
-   :meth:`ActorNursery.run_in_actor` is a *convenience* one-shot —
-   spawn, run a single task, auto-cancel after the result — slated
-   to be rebuilt as a high-level wrapper, so don't design around
-   it as the core model.
-
-.. deprecated:: 0.1.0a6
-
-   ``ActorNursery.cancelled`` warns; use
-   :attr:`ActorNursery.cancel_called` and
-   :attr:`ActorNursery.cancelled_caught`. The ``rpc_module_paths``
-   kwarg is likewise deprecated in favor of ``enable_modules``.
-
-Portals
--------
-
-A :class:`Portal` "opens a portal" into a peer actor's memory
-domain: you call functions and start SC-linked tasks *over IPC* as
-though they were local, with results, errors and cancellation
-flowing back `exactly like trio`_.
-
-.. autoclass:: Portal
-   :members: run,
-             run_from_ns,
-             open_stream_from,
-             wait_for_result,
-             cancel_actor,
-             chan
-
-.. deprecated:: 0.1.0a6
-
-   ``Portal.result()`` warns; use :meth:`Portal.wait_for_result`.
-   The str-form ``Portal.run('mod.path', 'fn_name')`` also warns;
-   pass a function *object* whose module is listed in the target's
-   ``enable_modules``. ``Portal.channel`` is the legacy spelling
-   of :attr:`Portal.chan`.
-
-.. autofunction:: tractor._context.open_context_from_portal
-
-.. note::
-
-   :func:`~tractor._context.open_context_from_portal` is bound as
-   the **method-alias** ``Portal.open_context()`` — that's the
-   spelling you should actually call:
-   ``portal.open_context(fn, **kwargs)``. See :doc:`/api/context`
-   for the full ``Context`` + ``MsgStream`` API it unlocks.
-
-.. note::
-
-   :meth:`Portal.cancel_actor` cancels the *whole* remote runtime
-   and process (machine-level), not a single task — use
-   :meth:`Context.cancel` for task-level cancellation. Pass
-   ``raise_on_timeout=True`` to get an ``ActorTooSlowError`` you
-   can escalate per SC discipline (see :doc:`/api/errors`).
-
-Clusters
---------
-
-.. autofunction:: open_actor_cluster
-
-Spawn a *flat* cluster of ``count`` worker actors (default: one
-per core) all serving the RPC ``modules`` list, yielding a
-``dict[str, Portal]`` keyed by actor name. Handy for
-embarrassingly parallel fan-out; see ``examples/quick_cluster.py``.
-
-Runtime introspection
----------------------
-
-.. autofunction:: current_actor
-
-.. autoclass:: Actor
-   :members: aid,
-             name,
-             uid,
-             is_registrar,
-             is_infected_aio,
-             cancel_soon
-
-.. note::
-
-   :class:`Actor` is the per-process runtime singleton (msg loop,
-   RPC scheduling, IPC server) — you never instantiate it yourself
-   and should normally only touch the identity/introspection
-   surface listed above. The canonical identity type is
-   :attr:`Actor.aid` (a ``tractor.msg.Aid`` struct);
-   :attr:`Actor.uid` is the legacy ``(name, uuid)`` 2-tuple which
-   is still pervasive in logs and error metadata.
-
-.. deprecated:: 0.1.0a6
-
-   ``Actor.is_arbiter`` warns; use :attr:`Actor.is_registrar`.
-   The ``arbiter_addr`` constructor kwarg is deprecated for
-   ``registry_addrs``.
-
-.. autofunction:: current_ipc_ctx
-
-.. autofunction:: is_root_process
-
-.. autofunction:: get_runtime_vars
-
-.. seealso::
-
-   :doc:`/api/context` for the SC-linked remote task API,
-   :doc:`/api/discovery` for finding actors by name, and the
-   guided tours in :doc:`/guide/spawning`, :doc:`/guide/rpc` and
-   :doc:`/guide/context`.
-
-.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
-.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics

docs/api/devx.rst

@@ -1,92 +0,0 @@
-Debugging and devx: ``tractor.devx``
-====================================
-
-Multi-process debugging that actually works: boot the tree with
-``open_root_actor(debug_mode=True)`` (or pass it to
-``open_nursery()``) and any crash or explicit pause in *any* actor
-acquires a tree-global TTY lock and drops you into a
-`pdbp`_-powered REPL — one actor at a time, ``SIGINT`` shielded,
-no garbled terminals. The top-level helpers below are the daily
-drivers; the rest of the toolbox lives under ``tractor.devx``.
-
-.. currentmodule:: tractor
-
-Pausing and post-mortems
-------------------------
-
-.. autofunction:: pause
-
-.. autofunction:: pause_from_sync
-
-.. note::
-
-   :func:`pause_from_sync` needs the `greenback`_ portal: boot
-   with ``open_root_actor(maybe_enable_greenback=True)`` (mind
-   the `performance implications`_). With ``debug_mode`` on, the
-   built-in ``breakpoint()`` is also remapped to a
-   ``tractor``-safe equivalent.
-
-.. autofunction:: post_mortem
-
-.. deprecated:: 0.1.0a6
-
-   ``tractor.breakpoint()`` warns and simply calls :func:`pause`
-   — use :func:`tractor.pause` (async) or
-   :func:`tractor.pause_from_sync` in new code.
-
-Crash handling for CLIs and sync entrypoints
---------------------------------------------
-
-.. currentmodule:: tractor.devx
-
-.. autofunction:: open_crash_handler
-
-.. autofunction:: maybe_open_crash_handler
-
-.. note::
-
-   Both are *sync* context managers usable before (or without)
-   ``trio.run()`` — wrap your CLI ``main()`` to get a post-mortem
-   REPL on any uncaught exception instead of a bare traceback.
-
-Runtime hang-hunting
---------------------
-
-.. autofunction:: enable_stack_on_sig
-
-With stackscope_ integration enabled (also via
-``open_root_actor(enable_stack_on_sig=True)`` or the
-``TRACTOR_ENABLE_STACKSCOPE`` env var) a ``SIGUSR1`` triggers a
-full trio task-tree dump from every actor — works on live,
-*non*-debug-mode trees too:
-
-.. code:: sh
-
-   pkill --signal SIGUSR1 -f <part-of-your-cmd>
-
-Dumps also tee to ``/tmp/tractor-stackscope-<pid>.log`` so you
-still get output under captured/CI stdio.
-
-Lower-level debug plumbing
---------------------------
-
-.. autofunction:: mk_pdb
-
-.. autofunction:: maybe_wait_for_debugger
-
-:func:`maybe_wait_for_debugger` is mainly useful in runtime/test
-code that must avoid tearing down a tree while a child still
-holds the global debug lock.
-
-.. seealso::
-
-   :doc:`/api/errors` for the boxed error types you'll inspect
-   from the REPL, :doc:`/api/core` for the ``debug_mode`` /
-   ``maybe_enable_greenback`` / ``enable_stack_on_sig`` boot
-   flags on :func:`tractor.open_root_actor`, and
-   :doc:`/guide/debugging` for the guided multi-actor REPL tour.
-
-.. _pdbp: https://github.com/mdmintz/pdbp
-.. _greenback: https://greenback.readthedocs.io/en/latest/
-.. _performance implications: https://greenback.readthedocs.io/en/latest/principle.html#performance
-.. _stackscope: https://github.com/oremanj/stackscope

docs/api/discovery.rst

@@ -1,67 +0,0 @@
-Discovery and the registrar
-===========================
-
-Every actor registers its ``(name, uuid)`` and transport addresses
-with a *registrar* actor — by default the root of the tree, or
-whichever actor serves at the ``registry_addrs`` you boot with.
-The discovery API lets any actor look up any other **by name** and
-get back a connected :class:`~tractor.Portal`, giving you
-service-discovery patterns (daemons, service trees, multi-host
-meshes) without hard-coding addresses.
-
-Lookups first scan already-connected peers before RPC-ing the
-registrar, and multihomed results are ranked UDS > local TCP >
-remote TCP. See ``examples/service_daemon_discovery.py`` for the
-canonical daemon + lookup pattern.
-
-.. currentmodule:: tractor
-
-Lookup APIs
------------
-
-.. autofunction:: find_actor
-
-.. autofunction:: wait_for_actor
-
-.. autofunction:: query_actor
-
-.. autofunction:: get_registry
-
-.. note::
-
-   :func:`find_actor` yields ``None`` when nothing is registered
-   under the name (or raises with ``raise_on_none=True``);
-   :func:`wait_for_actor` blocks until the name appears;
-   :func:`query_actor` only *looks up* the address without
-   connecting to the target.
-
-The ``Registrar``
------------------
-
-.. autoclass:: Registrar
-   :show-inheritance:
-
-A :class:`Registrar` is just an :class:`~tractor.Actor` subtype
-maintaining the name -> addresses table; you rarely touch it
-directly beyond passing ``registry_addrs`` /
-``ensure_registry=True`` to :func:`~tractor.open_root_actor`.
-Check :attr:`Actor.is_registrar <tractor.Actor.is_registrar>` to
-ask "am I it?".
-
-Legacy ``Arbiter`` alias
-------------------------
-
-.. deprecated:: 0.1.0a6
-
-   ``tractor.Arbiter`` survives only as a class alias of
-   :class:`Registrar` and all "arbiter" terminology is replaced
-   by "registrar"/"registry" across the API: ``get_arbiter()`` is
-   removed (use :func:`get_registry`) and the ``arbiter_addr``
-   kwarg is replaced by ``registry_addrs``.
-
-.. seealso::
-
-   :doc:`/api/core` for booting a registrar via
-   ``open_root_actor(registry_addrs=...)``, :doc:`/api/ipc` for
-   the transport/address model the registry stores, and
-   :doc:`/guide/discovery` for the worked walkthrough.

docs/api/errors.rst

@@ -1,102 +0,0 @@
-Errors and cancellation types
-=============================
-
-``tractor`` extends trio's "exceptions `always propagate`_" rule
-across the process boundary: a crash in any actor is serialized as
-an ``Error`` msg, shuttled over IPC, and re-raised in the linked
-parent scope as a *boxed* :class:`RemoteActorError` — preserving
-the original type, traceback text and source-actor identity, even
-across multi-hop relays (a.k.a. "inceptions").
-
-The most-used types below are importable from ``tractor``
-directly; the remainder live in ``tractor._exceptions`` (not yet
-re-exported at top level).
-
-.. currentmodule:: tractor
-
-Boxed remote errors
--------------------
-
-.. autoexception:: RemoteActorError
-   :members: boxed_type,
-             src_uid,
-             relay_uid,
-             pformat
-
-.. code:: python
-
-   try:
-       async with portal.open_context(ep_fn) as (ctx, first):
-           ...
-   except tractor.RemoteActorError as rae:
-       if rae.boxed_type is ValueError:
-           ...  # remote task raised a `ValueError`
-
-.. autoexception:: ContextCancelled
-   :show-inheritance:
-   :members: canceller
-
-.. note::
-
-   Inspect :attr:`ContextCancelled.canceller` (the requesting
-   actor's uid) to distinguish a *self*-requested cancel (absorbed
-   at ``open_context()`` exit) from a *cross*-actor cancel (raised
-   locally) — the full rules live in :doc:`/api/context`.
-
-Typed-messaging errors
-----------------------
-
-.. autoexception:: MsgTypeError
-   :show-inheritance:
-   :members: bad_msg,
-             expected_msg_type
-
-An "IPC ``TypeError``": a message failed validation against the
-active msg-spec / ``pld_spec`` (see :doc:`/api/msg`). Raised
-sender-side for control msgs (``Started``/``Return``) and
-receiver-side for stream ``Yield`` payloads.
-
-.. autoexception:: tractor._exceptions.StreamOverrun
-   :show-inheritance:
-
-The sender out-paced the receiver's buffer on a
-:class:`~tractor.MsgStream` opened without
-``allow_overruns=True``; subtypes :class:`trio.TooSlowError`.
-
-Transport and runtime errors
-----------------------------
-
-.. autoexception:: TransportClosed
-
-.. autoexception:: ModuleNotExposed
-   :show-inheritance:
-
-Raised when an RPC requests a function from a module not listed
-in the target actor's ``enable_modules`` allowlist —
-capability-style access control, not an import bug on your end ;)
-
-.. autoexception:: tractor._exceptions.NoRuntime
-   :show-inheritance:
-
-Raised by :func:`tractor.current_actor` (and friends) when no
-actor runtime is up in the current process.
-
-.. autoexception:: tractor._exceptions.ActorTooSlowError
-   :show-inheritance:
-
-A peer actor failed to ack a cancel request within the bounded
-wait — the SC-sanctioned escalation signal from APIs like
-``Portal.cancel_actor(raise_on_timeout=True)``. Catch it to
-escalate (e.g. hard-kill via the supervising
-:class:`~tractor.ActorNursery`); never just ignore it, that's how
-zombies happen.
-
-.. seealso::
-
-   :doc:`/api/context` for how cancellation and errors flow
-   through a :class:`~tractor.Context`, :doc:`/api/devx` for
-   crash-handling REPL tooling (``debug_mode``, post-mortems),
-   and :doc:`/guide/cancellation` for the full SC-cancellation
-   story.
-
-.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate

docs/api/index.rst

@@ -1,67 +0,0 @@
-API reference
-=============
-
-This is the curated reference for ``tractor``'s public surface: the
-names you can import and lean on without reading runtime internals.
-Everything below is re-exported at the top level (``import
-tractor``) unless a page says otherwise; subsystems like
-``tractor.msg``, ``tractor.trionics``, ``tractor.to_asyncio``,
-``tractor.devx`` and ``tractor.log`` are importable as submodules.
-
-``tractor`` is "just trio_" extended across processes: every API
-here is designed to keep the structured concurrency (SC) rules you
-already know from the `trio docs`_ intact across the process
-boundary. If a name isn't documented here it's an internal — expect
-it to change without notice B).
-
-.. currentmodule:: tractor
-
-Most-used names at a glance:
-
-.. autosummary::
-   :nosignatures:
-
-   open_root_actor
-   open_nursery
-   run_daemon
-   ActorNursery
-   Portal
-   context
-   Context
-   MsgStream
-   open_actor_cluster
-   find_actor
-   wait_for_actor
-   get_registry
-   current_actor
-   current_ipc_ctx
-   is_root_process
-   get_runtime_vars
-   RemoteActorError
-   ContextCancelled
-   MsgTypeError
-   pause
-   post_mortem
-   Channel
-
-.. toctree::
-   :maxdepth: 1
-   :caption: Reference pages
-
-   core
-   context
-   discovery
-   errors
-   msg
-   trionics
-   to_asyncio
-   devx
-   ipc
-
-Where to next? If you're new, start with the runtime and spawning
-APIs in :doc:`/api/core`, then graduate to the inter-actor task
-linking model in :doc:`/api/context` — it's the heart of the whole
-system.
-
-.. _trio: https://github.com/python-trio/trio
-.. _trio docs: https://trio.readthedocs.io/en/latest/

docs/api/ipc.rst

@@ -1,89 +0,0 @@
-IPC and logging
-===============
-
-Under every portal, context and stream sits a per-peer
-:class:`~tractor.Channel`: a msgpack-typed messaging link wrapping
-one OS transport connection. Transports are pluggable per actor
-via ``enable_transports=['tcp' | 'uds']`` — TCP is the default,
-UDS (unix domain sockets) gives you port-less, same-host IPC with
-kernel-provided peer credentials for free — and exactly **one**
-transport may currently be enabled per actor.
-
-.. d2:: diagrams/runtime_stack.d2
-   :caption: Where ``Channel`` sits in the runtime stack.
-   :margin:
-   :alt: layered runtime stack from app code down to transports
-
-Addresses are "unwrapped" tuples at the API edges:
-``('host', port)`` for TCP, filesystem-path pairs for UDS. For
-the full layering story — transport protocols, the IPC server,
-address types and the msg loop — see
-:doc:`/explain/architecture`.
-
-.. currentmodule:: tractor
-
-``Channel``
------------
-
-.. autoclass:: Channel
-   :members: from_addr,
-             send,
-             recv,
-             aclose,
-             connected,
-             apply_codec,
-             aid,
-             laddr,
-             raddr,
-             closed
-
-.. deprecated:: 0.1.0a6
-
-   ``Channel.uid`` warns; use :attr:`Channel.aid` which carries
-   richer (optional) identity fields beyond the legacy
-   ``(name, uuid)`` pair.
-
-.. note::
-
-   You rarely construct a :class:`Channel` yourself — the runtime
-   hands them out via :attr:`Portal.chan <tractor.Portal.chan>`
-   and :attr:`Context.chan <tractor.Context.chan>`. Treat the
-   send/recv surface as advanced API: normal apps should speak
-   :class:`~tractor.MsgStream` instead.
-
-Choosing a transport
---------------------
-
-.. literalinclude:: ../../examples/uds_transport_actor_tree.py
-   :caption: examples/uds_transport_actor_tree.py
-   :language: python
-
-Logging
--------
-
-``tractor.log`` provides the structured, colorized console
-logging used across the runtime — with actor-name + task-aware
-record headers and extra log levels below :data:`logging.DEBUG`
-(``'transport'``, ``'runtime'``, ``'cancel'``, ``'devx'``) for
-spelunking the runtime itself. Use it for your app too: it's
-already distributed-system aware.
-
-.. currentmodule:: tractor.log
-
-.. autofunction:: get_logger
-
-.. autofunction:: get_console_log
-
-.. note::
-
-   The ``TRACTOR_LOGLEVEL`` env var overrides any caller-passed
-   ``loglevel`` (e.g. to ``open_root_actor()``) so you can crank
-   console verbosity without touching code; subactors inherit
-   the root's level by default.
-
-.. seealso::
-
-   :doc:`/explain/architecture` for the transport/server
-   internals, :doc:`/api/discovery` for how channel addresses
-   get registered and found, and :doc:`/api/msg` for the codec
-   layer every channel speaks.

docs/api/msg.rst

@@ -1,107 +0,0 @@
-Typed messaging: ``tractor.msg``
-================================
-
-All inter-actor communication rides a small, strictly-typed
-msgpack wire protocol built from :class:`msgspec.Struct` types —
-the "SC-shuttle" protocol that powers contexts, streams, RPC and
-cancellation. You normally never touch these msg types directly
-(the :class:`~tractor.Context` API speaks them for you) but you
-*do* use this subpackage to define **payload type contracts**: per
-endpoint via ``@tractor.context(pld_spec=...)`` or per channel via
-custom codecs.
-
-Violations of an active msg-spec surface as
-:class:`~tractor.MsgTypeError` (see :doc:`/api/errors`); the full
-typed-payload workflow is shown in ``examples/typed_payloads.py``.
-
-.. currentmodule:: tractor.msg
-
-The protocol message set
-------------------------
-
-.. autosummary::
-   :nosignatures:
-
-   PayloadMsg
-   Aid
-   SpawnSpec
-   Start
-   StartAck
-   Started
-   Yield
-   Stop
-   Return
-   CancelAck
-   Error
-
-``Aid`` (identity handshake) and ``SpawnSpec`` (parent -> child
-init) run at connection setup; ``Start``/``StartAck`` initiate an
-RPC task; ``Started``/``Yield``/``Stop``/``Return`` are the
-:class:`~tractor.Context` dialog phases; ``CancelAck`` and
-``Error`` close the loop on cancellation and (boxed) failure.
-``Msg`` is a legacy alias of ``PayloadMsg``. The union of all of
-the above is exported as ``MsgType`` (also ``__msg_spec__``).
-
-.. automodule:: tractor.msg.types
-   :no-members:
-
-.. currentmodule:: tractor.msg
-
-Codec construction and override
--------------------------------
-
-.. autofunction:: mk_codec
-
-.. autoclass:: MsgCodec
-   :members: encode,
-             decode,
-             msg_spec
-
-.. autofunction:: mk_dec
-
-.. autoclass:: MsgDec
-   :members: decode,
-             spec
-
-.. autofunction:: apply_codec
-
-.. autofunction:: current_codec
-
-.. note::
-
-   :func:`apply_codec` swaps the codec via a
-   :class:`contextvars.ContextVar` — the override only applies to
-   the *current task* (and tasks it starts), not sibling tasks
-   already running in the actor. Payload-decoding is layered: the
-   outer codec leaves ``.pld`` fields as ``msgspec.Raw`` and each
-   context's payload-receiver decodes them against *its* spec
-   (the "cheap-or-nasty" validation pattern).
-
-Namespace pointers
-------------------
-
-.. autoclass:: NamespacePath
-   :members: from_ref,
-             load_ref,
-             to_tuple
-
-The ``'module.path:obj_name'`` :class:`str`-subtype used to
-address every RPC target function over the wire (same format as
-:func:`pkgutil.resolve_name`).
-
-Pretty structs
---------------
-
-.. autoclass:: Struct
-   :show-inheritance:
-
-A :class:`msgspec.Struct` subtype with a multi-line pretty
-``__repr__`` — handy as a base for your own IPC payload types so
-crash logs stay readable.
-
-.. seealso::
-
-   :doc:`/api/context` for where ``pld_spec`` typing plugs into
-   the ``@context`` decorator, :doc:`/api/errors` for
-   :class:`~tractor.MsgTypeError` semantics, and
-   :doc:`/guide/msging` for the guided typed-messaging tour.

docs/api/to_asyncio.rst

@@ -1,97 +0,0 @@
-asyncio interop: ``tractor.to_asyncio``
-=======================================
-
-"Infected asyncio" mode: spawn an actor with
-``start_actor(..., infect_asyncio=True)`` and its process runs
-:mod:`trio` as a `guest`_ on top of the :mod:`asyncio` loop —
-letting your trio task tree drive asyncio tasks *in the same
-process* while the rest of the actor tree stays pure trio. Each
-trio <-> asyncio task pair is linked with structured concurrency
-(SC) semantics: error or cancellation on either side tears down
-both, with the cause translated cross-loop.
-
-.. d2:: diagrams/infected_aio.d2
-   :caption: A trio guest driving asyncio tasks in one actor.
-   :margin:
-   :alt: trio guest mode inside an asyncio-infected actor
-
-See ``examples/infected_asyncio_echo_server.py`` for a complete
-worked example.
-
-.. currentmodule:: tractor.to_asyncio
-
-Starting asyncio tasks from trio
---------------------------------
-
-.. autofunction:: open_channel_from
-
-.. autofunction:: run_task
-
-.. note::
-
-   :func:`open_channel_from` mirrors the
-   ``Portal.open_context()`` handshake: the asyncio side calls
-   ``chan.started_nowait(value)`` and that value pops out as
-   ``first`` on the trio side. :func:`run_task` is the one-shot
-   form — run a single asyncio-compatible coroutine fn and return
-   its result to trio.
-
-The inter-loop channel
-----------------------
-
-.. autoclass:: LinkedTaskChannel
-   :members: send,
-             receive,
-             wait_for_result,
-             subscribe,
-             started_nowait,
-             send_nowait,
-             get,
-             cancel_asyncio_task,
-             closed
-
-.. note::
-
-   The trio side uses the async API
-   (:meth:`LinkedTaskChannel.send` /
-   :meth:`LinkedTaskChannel.receive`); the asyncio side uses the
-   loop-safe sync/await mix
-   (:meth:`LinkedTaskChannel.send_nowait` /
-   :meth:`LinkedTaskChannel.get` /
-   :meth:`LinkedTaskChannel.started_nowait`).
-
-Translated exception types
---------------------------
-
-Cross-loop failures are re-raised on the *other* side as one of
-these explicit translation types, so you always know which loop
-actually died first:
-
-.. autoexception:: tractor._exceptions.AsyncioCancelled
-
-.. autoexception:: tractor._exceptions.AsyncioTaskExited
-
-.. autoexception:: tractor._exceptions.TrioCancelled
-
-.. autoexception:: tractor._exceptions.TrioTaskExited
-
-.. autoexception:: AsyncioRuntimeTranslationError
-   :show-inheritance:
-
-Guest-mode entrypoint
----------------------
-
-``run_as_asyncio_guest()`` is the runtime-internal entrypoint that
-boots trio in `guest`_ mode inside an infected actor — you get it
-implicitly via ``infect_asyncio=True`` and shouldn't need to call
-it yourself.
-
-.. seealso::
-
-   :doc:`/api/core` for the ``infect_asyncio`` spawn flag,
-   :meth:`tractor.Actor.is_infected_aio` for runtime
-   introspection, :doc:`/api/devx` for using the debugger from
-   inside asyncio tasks, and :doc:`/guide/asyncio` for the
-   guided tour.
-
-.. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops

docs/api/trionics.rst

@@ -1,76 +0,0 @@
-Trio patterns: ``tractor.trionics``
-===================================
-
-Sugary structured concurrency (SC) patterns for plain :mod:`trio`
-code — **no actor runtime required**. These helpers grew out of
-real distributed-system needs in ``tractor`` apps but every one of
-them works in a single-process program too; import via
-``from tractor import trionics``.
-
-.. currentmodule:: tractor.trionics
-
-Context-manager helpers
------------------------
-
-.. autofunction:: gather_contexts
-
-.. autofunction:: maybe_open_context
-
-.. autofunction:: maybe_open_nursery
-
-.. note::
-
-   :func:`gather_contexts` is "a nursery for async context
-   managers": it enters N acms concurrently and yields their
-   values in input order. :func:`maybe_open_context` is the
-   actor-wide cache/multiplex layer on top — the first task pays
-   the acm setup cost, later callers get ``(cache_hit=True, ...)``
-   and share the same value until all users exit.
-
-Broadcast fan-out
------------------
-
-.. autofunction:: broadcast_receiver
-
-.. autoclass:: BroadcastReceiver
-   :members: receive,
-             subscribe,
-             aclose
-
-.. autoexception:: Lagged
-   :show-inheritance:
-
-A single-producer, many-consumer broadcast layer over any
-``trio``-style receive channel: non-lossy for the *fastest*
-consumer while slower consumers raise :class:`Lagged` (a
-:class:`trio.TooSlowError` subtype) once they fall behind the
-internal ring. This is exactly the machinery behind
-:meth:`tractor.MsgStream.subscribe` — see
-``examples/streaming_broadcast_fanout.py``.
-
-ExceptionGroup helpers
-----------------------
-
-.. autofunction:: collapse_eg
-
-.. autofunction:: maybe_raise_from_masking_exc
-
-.. note::
-
-   :func:`collapse_eg` "un-nests" single-exception
-   :class:`ExceptionGroup` wrappers from strict-eg ``trio``
-   nurseries so your ``except`` clauses match the original error;
-   :func:`maybe_raise_from_masking_exc` surfaces real errors that
-   would otherwise be masked by :class:`trio.Cancelled` during
-   teardown.
-
-.. seealso::
-
-   :doc:`/api/context` for the IPC-stream consumer of
-   :class:`BroadcastReceiver`, :doc:`/guide/streaming` for
-   fan-out in a worked pipeline, and the `trio docs`_ for the
-   underlying channel and `nursery`_ semantics these helpers
-   compose.
-
-.. _trio docs: https://trio.readthedocs.io/en/latest/
-.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning

docs/conf.py

@@ -1,160 +1,105 @@
-# tractor: distributed structured concurrency.
-'''
-Sphinx config for `tractor`'s documentation.
+# Configuration file for the Sphinx documentation builder.
+#
+# This file only contains a selection of the most common options. For a full
+# list see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
 
-Theme-wise we ride the `pydata_sphinx_theme` (per the
-research + history in #157) skinned to a minimal
-black + white look via `_static/css/custom.css`; see
-the local extensions under `_ext/` for our `.. d2::`
-diagram and `.. margin::` aside directives.
+# -- Path setup --------------------------------------------------------------
 
-Build locally via,
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
 
-    uv run --group docs make -C docs html
+# Warn about all references to unknown targets
+nitpicky = True
 
-'''
-from importlib.metadata import version as get_version
-from pathlib import Path
-import sys
+# The master toctree document.
+master_doc = 'index'
 
-# local sphinx extensions live in `_ext/`:
-# - `d2diagrams`: `.. d2::` diagram rendering
-# - `marginalia`: `.. margin::` RHS prose-asides
-sys.path.insert(
-    0,
-    str((Path(__file__).parent / '_ext').resolve()),
-)
-
-# -- project info ---------------------------------
+# -- Project information -----------------------------------------------------
 
 project = 'tractor'
-copyright = '2018-2026, Tyler Goodlet'
+copyright = '2018, Tyler Goodlet'
 author = 'Tyler Goodlet'
-release: str = get_version('tractor')
-version: str = release
 
-# -- general config -------------------------------
+# The full version, including alpha/beta/rc tags
+release = '0.0.0a0.dev0'
 
+# -- General configuration ---------------------------------------------------
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
 extensions = [
     'sphinx.ext.autodoc',
-    'sphinx.ext.autosummary',
     'sphinx.ext.intersphinx',
-    'sphinx.ext.viewcode',
     'sphinx.ext.todo',
-    # emit a `.nojekyll` so GitHub Pages serves the `_static/`
-    # + `_images/` dirs (Jekyll would otherwise drop `_`-prefixed
-    # paths and break all styling/assets).
-    'sphinx.ext.githubpages',
-    'sphinx_design',
-    'sphinx_copybutton',
-    'sphinxext.opengraph',
-    'sphinx_togglebutton',
-    'd2diagrams',
-    'marginalia',
 ]
+
+# Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
-exclude_patterns = [
-    '_build',
-    # the pypi/gh readme + its standalone generator
-    # sub-project; NOT doc-tree pages.
-    'README.rst',
-    'github_readme',
-    'Thumbs.db',
-    '.DS_Store',
-]
-root_doc = 'index'
-# TODO: flip this on + burn down the (many) warnings
-# from our informal docstring style; see the autodoc
-# readiness notes from the revamp's recon pass.
-nitpicky = False
 
-# -- autodoc/autosummary --------------------------
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
 
-autodoc_member_order = 'bysource'
-autodoc_typehints = 'description'
-autosummary_generate = True
 
-# -- intersphinx ----------------------------------
+# -- Options for HTML output -------------------------------------------------
 
-intersphinx_mapping = {
-    'python': (
-        'https://docs.python.org/3',
-        None,
-    ),
-    'trio': (
-        'https://trio.readthedocs.io/en/stable',
-        None,
-    ),
-    # NOTE, msgspec's site doesn't publish an
-    # `objects.inv` (404s) so no intersphinx for it.
-    'pytest': (
-        'https://docs.pytest.org/en/stable',
-        None,
-    ),
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_book_theme'
+
+pygments_style = 'algol_nu'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+html_theme_options = {
+    # 'logo': 'tractor_logo_side.svg',
+    # 'description': 'Structured concurrent "actors"',
+    "repository_url": "https://github.com/goodboy/tractor",
+    "use_repository_button": True,
+    "home_page_in_toc": False,
+    "show_toc_level": 1,
+    "path_to_docs": "docs",
+
+}
+html_sidebars = {
+    "**": [
+        "sbt-sidebar-nav.html",
+        # "sidebar-search-bs.html",
+        # 'localtoc.html',
+    ],
+    #     'logo.html',
+    #     'github.html',
+    #     'relations.html',
+    #     'searchbox.html'
+    # ]
 }
 
-# -- html output ----------------------------------
+# doesn't seem to work?
+# extra_navbar = "<p>nextttt-gennnnn</p>"
 
-html_theme = 'pydata_sphinx_theme'
-html_title = 'tractor'
-# canonical site root (GitHub Pages); drives <link rel=canonical>,
-# og:url + any future sitemap. Update if a custom domain is added.
-html_baseurl = 'https://goodboy.github.io/tractor/'
+html_title = ''
 html_logo = '_static/tractor_logo_side.svg'
 html_favicon = '_static/tractor_logo_side.svg'
+# show_navbar_depth = 1
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
-html_css_files = ['css/custom.css']
-html_show_sourcelink = False
-html_theme_options = {
-    # theme-adaptive navbar logo: faces transparent, linework
-    # near-black on light / near-white on dark (pydata swaps by
-    # the active theme). Matches the landing hero's wireframe.
-    'logo': {
-        'image_light': '_static/tractor_logo_nav_light.svg',
-        'image_dark': '_static/tractor_logo_nav_dark.svg',
-        'alt_text': 'tractor',
-        # text shown to the right of the navbar logo (à la
-        # polars).
-        'text': 'tractor',
-    },
-    'github_url': 'https://github.com/goodboy/tractor',
-    'navbar_align': 'content',
-    'show_toc_level': 2,
-    'secondary_sidebar_items': {
-        '**': ['page-toc'],
-        'index': [],
-    },
-    'use_edit_page_button': True,
-    'footer_start': ['copyright'],
-    'footer_end': ['theme-version'],
-    'pygments_light_style': 'algol_nu',
-    'pygments_dark_style': 'github-dark',
+
+# Example configuration for intersphinx: refer to the Python standard library.
+intersphinx_mapping = {
+    "python": ("https://docs.python.org/3", None),
+    "pytest": ("https://docs.pytest.org/en/latest", None),
+    "setuptools": ("https://setuptools.readthedocs.io/en/latest", None),
 }
-html_context = {
-    'github_user': 'goodboy',
-    'github_repo': 'tractor',
-    'github_version': 'main',
-    'doc_path': 'docs',
-}
-
-# -- ext: opengraph -------------------------------
-
-ogp_site_url = 'https://goodboy.github.io/tractor/'
-ogp_use_first_image = True
-
-# -- ext: copybutton ------------------------------
-
-copybutton_prompt_text = r'>>> |\.\.\. |\$ '
-copybutton_prompt_is_regexp = True
-
-# -- ext: todo ------------------------------------
-
-todo_include_todos = True
-
-# -- ext: d2diagrams (local) ----------------------
-
-# normally resolved from PATH or the `D2_BIN` env
-# var; when neither hits, the committed SVGs under
-# `_diagrams/` are used as-is.
-d2_bin = None
-d2_args = []

docs/dev_tips.rst

@@ -0,0 +1,51 @@
+Hot tips for ``tractor`` hackers
+================================
+
+This is a WIP guide for newcomers to the project mostly to do with
+dev, testing, CI and release gotchas, reminders and best practises.
+
+``tractor`` is a fairly novel project compared to most since it is
+effectively a new way of doing distributed computing in Python and is
+much closer to working with an "application level runtime" (like erlang
+OTP or scala's akka project) then it is a traditional Python library.
+As such, having an arsenal of tools and recipes for figuring out the
+right way to debug problems when they do arise is somewhat of
+a necessity.
+
+
+Making a Release
+----------------
+We currently do nothing special here except the traditional
+PyPa release recipe as in `documented by twine`_. I personally
+create sub-dirs within the generated `dist/` with an explicit
+release name such as `alpha3/` when there's been a sequence of
+releases I've made, but it really is up to you how you like to
+organize generated sdists locally.
+
+The resulting build cmds are approximately:
+
+.. code:: bash
+
+    python setup.py sdist -d ./dist/XXX.X/
+
+    twine upload -r testpypi dist/XXX.X/*
+
+    twine upload dist/XXX.X/*
+
+
+
+.. _documented by twine: https://twine.readthedocs.io/en/latest/#using-twine
+
+
+Debugging and monitoring actor trees
+------------------------------------
+TODO: but there are tips in the readme for some terminal commands
+which can be used to see the process trees easily on Linux.
+
+
+Using the log system to trace `trio` task flow
+----------------------------------------------
+TODO: the logging system is meant to be oriented around
+stack "layers" of the runtime such that you can track
+"logical abstraction layers" in the code such as errors, cancellation,
+IPC and streaming, and the low level transport and wire protocols.

docs/diagrams/actor_tree.d2

@@ -1,31 +0,0 @@
-# tractor docs diagram: the hero supervision tree.
-# A process tree of trio-task-trees; every arrow is
-# a parent which *must wait* on its children.
-vars: {
-  d2-config: {
-    sketch: true
-    theme-id: 1
-    pad: 16
-    layout-engine: elk
-  }
-}
-direction: down
-root: "root actor" {
-  main: "main()"
-  an: "ActorNursery"
-  main -> an: opens
-}
-w0: "subactor\n'worker_0'" {
-  tasks: "trio task tree"
-}
-w1: "subactor\n'worker_1'" {
-  main: "serve()"
-  an: "ActorNursery"
-  main -> an: opens
-}
-gc: "subactor\n'deeper'" {
-  tasks: "trio task tree"
-}
-root.an -> w0: "spawns +\nsupervises"
-root.an -> w1: "spawns +\nsupervises"
-w1.an -> gc: "spawns +\nsupervises"

docs/diagrams/context_handshake.d2

@@ -1,33 +0,0 @@
-# tractor docs diagram: the inter-actor `Context`
-# dialog; tractor's SC-transitive msg protocol as
-# seen from both sides of `Portal.open_context()`.
-vars: {
-  d2-config: {
-    sketch: true
-    theme-id: 1
-    pad: 16
-    layout-engine: elk
-  }
-}
-shape: sequence_diagram
-parent: "parent task\n(Portal)"
-child: "child actor task\n(@tractor.context fn)"
-parent -> child: "Start: open_context(fn, **kwargs)"
-child -> parent: "StartAck"
-child -> parent: "Started: await ctx.started(value)"
-parent -> child: "Yield: stream.send()"
-child -> parent: "Yield: stream.send()"
-parent -> child: "Stop: stream closed"
-child -> parent: "Return: fn return value"
-# the non-graceful endings: errors/cancels always
-# propagate, both ways (`ContextCancelled` rides in
-# an `Error` msg, hence the `Error: ...` labels).
-"... or, instead of a graceful Return": {
-  parent-initiated: {
-    parent -> child: "ctx.cancel()  |  parent-side error"
-    child -> parent: "Error: ContextCancelled"
-  }
-  child-initiated: {
-    child -> parent: "Error: child raised  |  ContextCancelled"
-  }
-}

docs/diagrams/debug_lock.d2

@@ -1,19 +0,0 @@
-# tractor docs diagram: multi-actor debugger REPL
-# serialization via the root actor's tty lock.
-vars: {
-  d2-config: {
-    sketch: true
-    theme-id: 1
-    pad: 16
-    layout-engine: elk
-  }
-}
-shape: sequence_diagram
-mary: "subactor 'mary'"
-root: "root actor\n(owns the tty)"
-bob: "subactor 'bob'"
-mary -> root: "tractor.pause(): acquire tty lock"
-root -> mary: "granted: pdb REPL is yours"
-bob -> root: "tractor.pause(): acquire tty lock"
-mary -> root: "continue: release lock"
-root -> bob: "granted: pdb REPL is yours"

docs/diagrams/error_propagation.d2

@@ -1,27 +0,0 @@
-# tractor docs diagram: one-cancels-all error
-# propagation up a (sub-)actor tree; no zombies,
-# no lost errors.
-vars: {
-  d2-config: {
-    sketch: true
-    theme-id: 1
-    pad: 16
-    layout-engine: elk
-  }
-}
-direction: down
-root: "root actor\n(ActorNursery)"
-gertie: "subactor 'gertie'\n(healthy, gets cancelled)"
-bobbie: "subactor 'bobbie'\nraises NameError"
-root -> gertie: supervises
-root -> bobbie: supervises
-bobbie -> root: "RemoteActorError\n(boxed NameError)" {
-  style: {
-    stroke-dash: 3
-  }
-}
-root -> gertie: "cancel()" {
-  style: {
-    stroke-dash: 3
-  }
-}

docs/diagrams/infected_aio.d2

@@ -1,23 +0,0 @@
-# tractor docs diagram: "infected asyncio" mode;
-# trio runs as a guest on the asyncio loop with
-# SC supervision linking tasks across both.
-vars: {
-  d2-config: {
-    sketch: true
-    theme-id: 1
-    pad: 16
-    layout-engine: elk
-  }
-}
-direction: down
-sub: "subactor process (infect_asyncio=True)" {
-  aio: "asyncio event loop" {
-    aiotask: "asyncio.Task\naio_echo_server()"
-    trio: "trio (guest mode)" {
-      triotask: "trio task\n@tractor.context fn"
-    }
-    trio.triotask <-> aiotask: "LinkedTaskChannel\n.send()/.receive()"
-  }
-}
-parent: "parent actor (pure trio)"
-parent <-> sub.aio.trio.triotask: "IPC: Context + MsgStream"

docs/diagrams/runtime_stack.d2

@@ -1,16 +0,0 @@
-# tractor docs diagram: the layered runtime view
-# inside any single actor process.
-vars: {
-  d2-config: {
-    sketch: true
-    theme-id: 1
-    pad: 16
-    layout-engine: elk
-  }
-}
-grid-rows: 4
-grid-gap: 0
-app: "your app: plain trio tasks + nurseries"
-tractor: "tractor runtime: actors, portals,\ncontexts + streams, RPC"
-ipc: "IPC Channel: msgspec-typed msgs\nover TCP | UDS transports"
-os: "OS: one process per actor"

docs/diagrams/streaming_pipeline.d2

@@ -1,27 +0,0 @@
-# tractor docs diagram: multi-actor streaming
-# pipeline topology from
-# examples/full_fledged_streaming_service.py
-vars: {
-  d2-config: {
-    sketch: true
-    theme-id: 1
-    pad: 16
-    layout-engine: elk
-  }
-}
-direction: right
-s0: "actor 'streamer_0'" {
-  fn: "stream_data(0)"
-}
-s1: "actor 'streamer_1'" {
-  fn: "stream_data(1)"
-}
-agg: "actor 'aggregator'" {
-  fn: "aggregate()"
-}
-main: "root actor" {
-  fn: "main()"
-}
-s0 -> agg: "async for:\nyielded ints"
-s1 -> agg: "async for:\nyielded ints"
-agg -> main: "deduped\nstream"

docs/explain/architecture.rst

@@ -1,369 +0,0 @@
-Anatomy of the runtime
-======================
-
-You can get a long way with ``tractor`` by treating it as "trio_
-with nurseries that spawn processes". But once you start asking
-*where does my msg actually go?*, *which process is that?* or
-*who keeps the phonebook?*, it pays to know how the runtime hangs
-together. This page walks the stack top to bottom.
-
-.. d2:: diagrams/runtime_stack.d2
-   :caption: The four runtime layers inside *every* actor process.
-   :alt: layer cake of app tasks, tractor runtime, IPC, OS process
-   :width: 70%
-
-The layer cake
---------------
-
-Every actor process is the same four-layer sandwich:
-
-- **your app**: plain ``trio`` tasks, nurseries and cancel
-  scopes; nothing special. ``tractor`` is a `structured
-  concurrency`_ (SC) multi-processing runtime built on trio_ and
-  the whole pitch is that this layer stays *just trio*: no
-  callbacks, no futures, no proxy objects.
-- **the** ``tractor`` **runtime**: a per-process
-  :class:`tractor.Actor` running the msg loop and RPC task
-  scheduler, plus the user-facing primitives layered on it:
-  :class:`tractor.ActorNursery` (spawning + supervision),
-  :class:`tractor.Portal` (calling into a peer) and
-  :class:`tractor.Context` + :class:`tractor.MsgStream`
-  (SC-linked cross-actor task pairs and streaming).
-- **IPC channels**: one :class:`tractor.Channel` per connected
-  peer, each wrapping a ``MsgTransport`` that ships
-  msgspec_-typed msgs over TCP or UDS.
-- **the OS**: one process per actor, started by a swappable
-  spawn backend.
-
-The property that holds it all together: SC composes *through*
-the layers. A crash in a leaf actor's app task unwinds that
-actor's trio tree, ships across its IPC channel as a typed
-``Error`` msg, and unwinds the parent's trio tree in turn — the
-"SC-transitive supervision protocol" from the README's pitch.
-The whole tree cancels and errors like one big trio program; it
-just happens to be spread across processes.
-
-One actor, one process, one ``trio.run()``
-------------------------------------------
-
-A ``tractor`` "actor" is not a green thread, nor an object with
-a mailbox, nor a coroutine: it's one OS process running one
-:func:`trio.run` whose root task boots the runtime machinery —
-msg loop, RPC task scheduler, IPC server — all embodied by a
-single :class:`tractor.Actor` instance.
-
-.. margin:: Shared nothing
-
-   Processes buy you a real `shared nothing architecture`_: no
-   accidentally-shared mutable state, no GIL contention, and
-   every actor can be inspected (or killed) like any other OS
-   process.
-
-You rarely construct an :class:`~tractor.Actor` yourself; the
-runtime makes exactly one per process and you grab it with
-:func:`tractor.current_actor`:
-
-.. code:: python
-
-    import tractor
-
-    actor = tractor.current_actor()  # NoRuntime if none running
-    print(actor.aid.name)   # str name, need not be unique
-    print(actor.aid.uuid)   # uuid4 str, IS unique
-    print(actor.aid.pid)    # the OS pid
-    print(actor.uid)        # legacy (name, uuid) pair
-
-Identity is carried by the ``Aid`` msg-struct (see
-``tractor.msg.types``): a ``name``/``uuid``/``pid`` triple
-exchanged in the very first "mailbox handshake" whenever two
-actors connect. It's what the registrar stores and what shows up
-in logs and proc-titles. The older ``.uid`` 2-tuple of
-``(name, uuid)`` predates ``Aid`` and is still pervasive across
-the codebase; treat it as the legacy spelling of the same
-identity.
-
-If this smells like the `actor model`_, sure — but as the
-README warns, it probably doesn't look like what you *think* an
-actor model looks like, and that's intentional. Here an "actor"
-is purely a runtime-unit-of-abstraction: process +
-``trio.run()`` + IPC machinery.
-
-IPC: channels, transports, addresses
-------------------------------------
-
-Two connected actors talk through a :class:`tractor.Channel`: a
-duplex, per-peer msg pipe. Each ``Channel`` wraps a
-``MsgTransport`` instance which does the wire work: framing,
-encode/decode and the socket itself. The encoding is msgpack
-(via msgspec_) and *every* msg is an instance of one of the
-runtime's tagged-union :class:`msgspec.Struct` types: the
-``Aid`` handshake, ``Start``/``StartAck`` (RPC init),
-``Started``/``Yield``/``Stop``/``Return`` (the ctx dialog
-phases), ``Error``, etc. There is no raw-bytes mode; the
-msg-spec *is* the protocol, which is exactly what lets payloads
-be type-limited per-context (see ``pld_spec`` in
-:doc:`/guide/context`).
-
-Addresses come in two spellings:
-
-- *unwrapped*: the plain-tuple form you pass to user APIs —
-  ``('127.0.0.1', 1616)`` for tcp, or a
-  ``(<filedir>, <filename>)`` path-pair for uds;
-- *wrapped*: the internal ``TCPAddress``/``UDSAddress`` struct
-  types (plus libp2p-style multiaddr helpers over in
-  ``tractor.discovery``).
-
-You only ever need the tuple form; the runtime wraps and
-unwraps at the boundaries.
-
-TCP: the boring default
-***********************
-
-The default transport (``'tcp'``) binds each actor's IPC server
-to loopback ``('127.0.0.1', <random port>)`` unless told
-otherwise, and is the only choice when your tree spans hosts.
-Nothing exotic: ``trio`` TCP streams + length-prefixed msgpack
-framing.
-
-UDS: same-host, creds included
-******************************
-
-Pass ``enable_transports=['uds']`` and actors instead talk over
-unix-domain sockets, with socket files placed in the per-user
-runtime dir (``$XDG_RUNTIME_DIR/tractor/`` on linux, the
-``platformdirs`` equivalent elsewhere). Two perks over tcp on a
-single host:
-
-- no ports to fight over; addrs are just file paths,
-- the kernel snitches on your peer for free: the listening side
-  reads the connector's ``pid`` (plus ``uid``/``gid`` on linux)
-  straight off the socket via ``SO_PEERCRED`` /
-  ``LOCAL_PEERPID`` — no extra handshake msgs required B)
-
-.. warning::
-
-   Socket-file lifetime == listening actor lifetime. On
-   listener teardown the runtime ``os.unlink()``\s the socket
-   file immediately, so any *late* connection attempt (say, a
-   sub-actor racing to deregister with a registrar that's
-   already shutting down) fails with ``FileNotFoundError``.
-   And ofc, UDS is same-host only.
-
-Here's a full actor tree run entirely over uds:
-
-.. literalinclude:: ../../examples/uds_transport_actor_tree.py
-   :caption: examples/uds_transport_actor_tree.py
-   :language: python
-
-Picking a transport
-*******************
-
-Transport choice is per-actor via the ``enable_transports``
-kwarg accepted by :func:`tractor.open_root_actor` (and proxied
-through ``open_nursery()`` when it implicitly boots the
-runtime), plus per-child via
-``ActorNursery.start_actor(enable_transports=...)``. Two rules
-the runtime enforces today:
-
-- exactly ONE transport per actor: multi-transport actors are
-  on the roadmap but currently raise ``RuntimeError``;
-- your ``registry_addrs`` protos must all be in
-  ``enable_transports``: mismatches fail fast with
-  ``ValueError`` instead of (as in darker times) hanging the
-  registrar handshake forever.
-
-Spawn backends
---------------
-
-How does an actor actually *become* a process? Via a swappable
-spawn backend, selected with the ``start_method`` kwarg to
-:func:`tractor.open_root_actor`:
-
-``'trio'`` (default)
-   The home-grown spawner: re-exec the child as
-   ``python -m tractor._child`` using ``trio``'s subprocess
-   machinery, then bootstrap it over the first IPC exchange
-   (the parent ships a ``SpawnSpec`` msg carrying all init
-   state). Supported on all platforms and the most battle
-   tested choice by far.
-
-``'mp_spawn'`` / ``'mp_forkserver'``
-   The stdlib :mod:`multiprocessing` start-methods of the same
-   names (forkserver is posix-only). Mostly interesting for
-   ecosystem compat and start-up-latency tuning.
-
-``'subint'`` (in development, py3.14+)
-   On the roadmap (not yet selectable via ``start_method`` on
-   this release): run each actor as a `PEP 734`_
-   sub-interpreter (``concurrent.interpreters``) driven on its
-   own OS thread *inside the parent process* — interpreter-level
-   shared-nothing isolation with much faster start-up. Yes, this
-   bends the one-actor-one-process rule; the rest of the model
-   is unchanged.
-
-The ``TRACTOR_SPAWN_METHOD`` env-var beats any caller-passed
-``start_method``, so you can swap backends under an unmodified
-app:
-
-.. code:: bash
-
-    TRACTOR_SPAWN_METHOD=mp_forkserver python my_app.py
-
-One current limitation worth knowing: ``debug_mode=True`` (the
-crash-to-REPL machinery) is only supported on backends whose
-child-side runtime is trio-native, e.g. the default ``'trio'``;
-see :doc:`/guide/debugging` for the deats.
-
-The registrar
--------------
-
-Discovery needs a phonebook. Every actor, as part of boot,
-registers its ``Aid`` and bind-addrs with the *registrar*: an
-otherwise ordinary actor (a :class:`tractor.Registrar`, subtype
-of :class:`~tractor.Actor`) that keeps the name -> addrs table
-for the tree; on graceful exit each actor de-registers itself.
-
-.. margin:: Default registry addrs
-
-   With no ``registry_addrs`` passed:
-
-   - tcp: ``('127.0.0.1', 1616)``
-   - uds: ``registry@1616.sock``
-     in the runtime dir
-
-Who *is* the registrar? Decided at root boot, rendezvous style.
-:func:`tractor.open_root_actor` probes each addr in
-``registry_addrs`` with a quick connect-ping, then:
-
-- **somebody answered**: this root is a plain actor; it
-  registers with the existing registrar and binds random
-  same-proto addrs for its own IPC server;
-- **nobody answered**: this root *becomes* the registrar and
-  binds the registry addrs itself.
-
-So single-program trees need zero config — the root quietly
-self-appoints — while multi-program setups share a registrar by
-pointing every program at the same ``registry_addrs``. Pass
-``ensure_registry=True`` to demand that *this* call create the
-registry; it raises if the addrs are already served.
-
-The lookup APIs — :func:`tractor.find_actor`,
-:func:`tractor.wait_for_actor`, :func:`tractor.query_actor` and
-:func:`tractor.get_registry` — all consult it (after first
-checking already-connected peers):
-
-.. literalinclude:: ../../examples/service_daemon_discovery.py
-   :caption: examples/service_daemon_discovery.py
-   :language: python
-
-If you bump into "arbiter" in old issues or posts: that's the
-legacy name for the same thing, surviving in-code only as the
-``Arbiter = Registrar`` class alias; all current terminology is
-"registrar"/"registry". Fair warning per the README: this is
-still a **very naive** discovery sys (no re-election, no gossip
-protocol... yet) and a registrar is expected to outlive its
-registrants.
-
-Runtime env vars
-----------------
-
-A few env-vars let you re-tune a whole tree *without touching
-app code*; each wins over its corresponding kwarg:
-
-.. list-table::
-   :header-rows: 1
-   :widths: 30 44 26
-
-   * - env-var
-     - effect
-     - vs. kwarg
-   * - ``TRACTOR_LOGLEVEL``
-     - crank (or silence) console-log verbosity for every actor
-       in the tree
-     - beats ``loglevel``
-   * - ``TRACTOR_SPAWN_METHOD``
-     - swap the process spawn backend
-     - beats ``start_method``
-   * - ``TRACTOR_ENABLE_STACKSCOPE``
-     - install the ``SIGUSR1`` task-tree-dump handler in every
-       actor, even outside ``debug_mode`` (see
-       :doc:`/guide/debugging`)
-     - OR'd with ``enable_stack_on_sig``
-
-Spotting actors from your shell
-*******************************
-
-Every sub-actor sets an OS-level proc-title of the form
-``_subactor[<name>@<pid>]`` (via ``setproctitle``, silently
-skipped when not installed) so ``ps``/``htop``/``pstree`` show
-*which actor is which* at a glance. The README's signature
-incantation — watch a tree build and self-destruct live:
-
-.. code:: bash
-
-    $TERM -e watch -n 0.1 "pstree -a $$" \
-        & python examples/nested_actor_tree.py \
-        && kill $!
-
-For scripting there are two stable cmdline markers:
-
-.. code:: bash
-
-    pgrep -fa '_subactor\['     # live, titled sub-actors
-    pgrep -fa 'tractor._child'  # 'trio'-backend children not
-                                # yet (re)titled
-
-The title also lands in the kernel ``comm`` (truncated to ~15
-bytes) which survives into zombie state — that's what
-``tractor``'s own test-harness reapers key off. To be crystal
-clear about the contract though: you should never *need* a
-reaper; if you can create zombie child processes (without using
-a system signal) it **is a bug** — please report it!
-
-Logging
--------
-
-The runtime logs through a thin adapter over stdlib
-:mod:`logging` that stamps every record with actor + task info.
-Two calls get you going:
-
-.. code:: python
-
-    from tractor.log import get_console_log, get_logger
-
-    log = get_logger(__name__)  # actor/task-aware sub-logger
-    get_console_log('info')     # attach console handler @ level
-
-(or just pass ``loglevel='info'`` to
-:func:`tractor.open_root_actor` and the console handler comes up
-with the runtime).
-
-``tractor`` adds custom levels — and matching logger methods —
-that slot between the stdlib ones so you can dial in *which
-runtime subsystem* you want to hear from: ``.transport()`` (5),
-``.runtime()`` (15), ``.devx()`` (17), ``.cancel()`` (22), plus
-a ``PDB`` (500) level for debugger chatter. E.g.
-``loglevel='cancel'`` plays the whole cancellation chorus while
-staying quiet about transport-layer noise. Beyond that
-``tractor`` isn't opinionated about how you consume logs: it's
-all stdlib ``logging`` underneath.
-
-Where to next?
---------------
-
-.. seealso::
-
-   - :doc:`/guide/context` — the SC-linked cross-actor task API
-     that rides on every ``Channel``.
-   - :doc:`/guide/debugging` — ``debug_mode``, the multi-process
-     REPL and ``stackscope`` task-tree dumps.
-   - :doc:`/explain/sc-distributed` — *why*
-     one-actor-one-process, and what kind of "actor model" this
-     is (and isn't).
-
-.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _trio: https://github.com/python-trio/trio
-.. _actor model: https://en.wikipedia.org/wiki/Actor_model
-.. _shared nothing architecture: https://en.wikipedia.org/wiki/Shared-nothing_architecture
-.. _msgspec: https://jcristharif.com/msgspec/
-.. _PEP 734: https://peps.python.org/pep-0734/

docs/explain/index.rst

@@ -1,16 +0,0 @@
-Big ideas
-=========
-The conceptual core of ``tractor``: what *structured
-concurrency* (SC) means once your "tasks" are whole
-processes, and how the runtime is layered to deliver
-that without (much) magic.
-
-If you only read one page in these docs make it
-:doc:`sc-distributed`; if you read two, follow it with
-:doc:`architecture`.
-
-.. toctree::
-   :maxdepth: 2
-
-   sc-distributed
-   architecture

docs/explain/sc-distributed.rst

@@ -1,221 +0,0 @@
-Structured concurrency, across processes
-=========================================
-``tractor`` makes one bet: the discipline that made
-``trio``'s concurrency *readable* — `structured
-concurrency`_ (SC) — works just as well when the
-"tasks" are whole OS processes talking over a wire.
-This page distills what that means, from first
-principles, with as little ceremony as possible.
-
-.. margin:: The canon
-
-   If SC is new to you, the seminal `blog post`_ is
-   still the best hour you'll spend on concurrent
-   programming; the `trio docs`_, wikipedia's SC_
-   page and the diagrams over at libdill-docs_ round
-   it out nicely.
-
-SC in one breath
-----------------
-Structured concurrency is the rule that **concurrency
-gets a scope**: every task is spawned *inside* a block
-(a ``trio`` *nursery*) and that block **cannot exit
-until every task it spawned has finished** — returned,
-errored, or been cancelled.
-
-That one rule buys you the properties you already
-rely on in sequential code,
-
-- a function call is a *black box*: when it returns,
-  everything it started is **done** — no secret
-  background tasks leaking out the sides,
-- an exception **always has somewhere to go**: up the
-  (task) tree to a parent which is, by construction,
-  still there waiting,
-- cancellation has a well defined *shape*: cancel a
-  scope and it flows down to every task inside it,
-  and only those.
-
-In short: your **runtime task tree matches your source
-code's indentation**. Concurrency you can read.
-
-The leap: process-shaped tasks
-------------------------------
-Now swap "task" for "process".
-
-A ``tractor`` *actor* is just a Python process running
-its own ``trio.run()`` — its own private task tree,
-sharing **nothing** with its siblings. You spawn
-actors from an :class:`tractor.ActorNursery`, which
-behaves exactly the way the name implies,
-
-.. code:: python
-
-    async with tractor.open_nursery() as an:
-        portal = await an.start_actor(
-            'worker',
-            enable_modules=[__name__],
-        )
-        ...
-    # ^ block exit == every spawned process has
-    # completed, errored or been cancelled, and
-    # been **reaped**. No exceptions, no zombies.
-
-so the whole program becomes a *tree of process-trees*
-— a `supervision tree`_ in erlang-speak — where every
-arrow means "spawned by, **waited on by**, and
-supervised by".
-
-.. d2:: diagrams/actor_tree.d2
-   :caption: A ``tractor`` program: a process tree of
-       ``trio`` task trees; every parent **must wait**
-       on its children.
-   :width: 85%
-
-Causality: no process outlives its parent
------------------------------------------
-The stdlib's ``multiprocessing`` (and most "job
-queue" systems) treat child processes as
-fire-and-forget by default: orphans, zombies, lost
-tracebacks and ``kill -9`` cleanup scripts are *your*
-problem. ``tractor`` instead inherits ``trio``'s
-`causality`_ discipline,
-
-- **no spawning willy-nilly**: every actor is born
-  from a nursery block with a known parent,
-- **lifetimes nest**: a sub-actor's entire process
-  tree lives strictly inside its parent's nursery
-  scope,
-- **teardown is guaranteed**: when a scope exits (or
-  errors, or is cancelled) the runtime SIGINTs,
-  waits, and (only if it must) hard-kills + reaps
-  everything underneath.
-
-We take the zombie thing personally: *if you can
-create orphaned child processes without using a
-system signal, it* **is a bug** — and there's a test
-suite to back that sentence up.
-
-Errors always propagate (yes, across the wire)
-----------------------------------------------
-In ``trio``, an exception in any task tears through
-its nursery to a parent that must handle it —
-`exceptions always propagate`_. ``tractor`` extends
-the same guarantee across process boundaries: an
-uncaught error in a remote task is
-
-1. captured + serialized in the child,
-2. shipped home over IPC as a typed ``Error`` msg,
-3. re-raised in the parent **boxed** as a
-   :class:`tractor.RemoteActorError` carrying the
-   original type (``.boxed_type``), a rendered remote
-   traceback, and the erroring actor's id,
-
-while the supervising nursery applies its (currently
-*one-cancels-all*, just like ``trio``) strategy to any
-sibling actors. A crash three processes deep arrives
-at your shell as one coherent, causal traceback chain
-— not a silent dead worker and a stuck queue.
-
-Cancellation is a request, supervision is the rule
---------------------------------------------------
-Cancellation likewise keeps ``trio``'s semantics
-*verbatim*, just transported: cancelling an actor
-nursery (or a single :class:`tractor.Context` between
-two tasks in different processes) sends an explicit
-cancel **request** over IPC which the remote runtime
-translates into a real ``trio`` cancel-scope cancel —
-then *acks back* so the requester can await
-confirmation within a bounded time. Nothing is ever
-"just killed" first; graceful always precedes brutal.
-
-Because every cross-process dialog is a pair of
-**linked tasks** — one on each side, each inside its
-own cancel scope — SC stays *transitive*: supervision
-doesn't stop at the process boundary, it tunnels
-through every hop of the tree. The wire protocol that
-enforces this (a small set of typed msgs:
-``Start``/``Started``/``Yield``/``Stop``/``Return``/
-``Error``) is detailed in :doc:`/guide/msging` and
-:doc:`/guide/context`.
-
-Hold up, is this an "actor model"?
-----------------------------------
-Let's stop and ask how many canon actor model papers
-you've actually read ;)
-
-From our experience many "actor systems" aren't really
-"actor models" since they **don't adhere** to the `3
-axioms`_ and pay even less attention to the problem of
-`unbounded non-determinism`_ — which was the whole
-point for creating the model in the first place.
-
-From `the author's mouth`_, the **only** requirement
-is `adherence to`_ the `3 axioms`_::
-
-    In response to a message, an actor may:
-
-    - send a finite number of new messages
-    - create a finite number of new actors
-    - designate a new behavior to process subsequent
-      messages
-
-Want to debate whether that makes us a "real" actor
-model? Chime in on our chat, or on one of these issues
-*after you've read everything in them* ;)
-
-- `#210 <https://github.com/goodboy/tractor/issues/210>`_
-- `#18 <https://github.com/goodboy/tractor/issues/18>`_
-
-``tractor`` adheres — actors exchange msgs, spawn
-actors, and swap behaviors — **with no extra API** to
-learn. What we *don't* copy is the cultural baggage:
-no visible mailboxes, no untyped fire-and-forget
-``send()``, no "let it crash" without a supervisor
-that actually hears about it, and definitely no
-shared-reference *proxy objects* pretending the
-network isn't there. If our "actors" don't look like
-what you expected, that's **intentional**: being an
-actor model is just one property of the system; being
-*structured* is the point.
-
-Why processes at all?
----------------------
-Python has a GIL; an actor model by definition shares
-no state; so the *process* is the natural runtime
-unit — you get real multi-core parallelism and hard
-memory isolation for free. But the deeper win is
-uniformity: because actors only ever talk via msgs
-over a :class:`tractor.Channel` (TCP, UDS, more to
-come), the **same code** runs your laptop's worker
-pool and a multi-host cluster; "distributed" is a
-deployment detail, not an API.
-
-It's just ``trio``
-------------------
-If you remember one framing, make it this: ``tractor``
-**is just** ``trio`` — with nurseries that can spawn
-processes and streams that can cross them. Same
-nursery discipline, same cancellation semantics, same
-"how was this not always the API?" feeling, one level
-up the process tree.
-
-.. seealso::
-
-   :doc:`/explain/architecture` for how the runtime
-   layers deliver all of the above, and
-   :doc:`/start/quickstart` to feel it in ~20 lines of
-   code.
-
-.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
-.. _trio docs: https://trio.readthedocs.io/en/latest/
-.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html
-.. _supervision tree: https://www.erlang.org/doc/design_principles/des_princ.html
-.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
-.. _exceptions always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
-.. _the author's mouth: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=162s
-.. _adherence to: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=1821s
-.. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts
-.. _unbounded non-determinism: https://en.wikipedia.org/wiki/Unbounded_nondeterminism

docs/guide/asyncio.rst

@@ -1,309 +0,0 @@
-Infected ``asyncio``
-====================
-``tractor`` is "just trio_", but the Python world is packed with
-libraries that only speak ``asyncio``: websocket stacks, vendor
-SDKs, that one exchange client you can't route around. Rather than
-make you rewrite them, ``tractor`` lets you *quarantine* them inside
-a dedicated subactor which runs both event loops at once, with full
-`structured concurrency`_ (SC) guarantees maintained across the
-loop boundary *and* the process tree.
-
-In the project's own words:
-
-    Yes, we spawn a python process, run ``asyncio``, start ``trio``
-    on the ``asyncio`` loop, then send commands to the ``trio``
-    scheduled tasks to tell ``asyncio`` tasks what to do XD
-
-We call this "infected ``asyncio``" mode: the subactor's stdlib
-loop runs as the *host* with ``trio`` embedded on top in `guest`_
-mode, and your ``trio`` tasks drive ``asyncio`` tasks through
-a linked, SC-supervised, in-memory channel.
-
-.. d2:: diagrams/infected_aio.d2
-   :caption: One process, two schedulers: ``trio`` rides the
-       ``asyncio`` loop as a guest while the parent speaks plain
-       ``tractor`` IPC, none the wiser.
-   :alt: parent actor connected over IPC to a subactor whose
-       asyncio loop hosts trio in guest mode, with a
-       LinkedTaskChannel pairing a trio task to an asyncio task
-
-.. note::
-
-   Infected ``asyncio`` mode is **experimental**: it works (we
-   beat on it plenty) but parts of the API surface and some
-   edge-case semantics are still settling. Got opinions on the
-   interop design? Feel free to sling them in `#273`_!
-
-How the infection takes hold
-----------------------------
-A normal subactor boots by running the ``tractor`` runtime's task
-tree directly under ``trio.run()``. Pass ``infect_asyncio=True``
-at spawn time and the child's entrypoint changes shape entirely:
-
-1. the process starts the stdlib loop via ``asyncio.run()``,
-2. the first ``asyncio`` task calls
-   ``trio.lowlevel.start_guest_run()``, embedding the ``trio``
-   scheduler *inside* the already running ``asyncio`` loop (the
-   upstream `guest`_-mode feature),
-3. the regular ``tractor`` runtime then boots on the guest
-   ``trio`` side and connects back to its parent like any other
-   subactor.
-
-.. margin:: Symptoms
-
-   Looks like your stdlib event loop has caught a case of "the
-   trios"! Don't worry, you'll barely notice; and if anything
-   gets too bad, your parents will know about it B)
-
-Both schedulers interleave in a single thread, no GIL gymnastics
-required. From the rest of the actor tree the infected child is
-indistinguishable from any other actor: same IPC protocol, same
-supervision and cancellation semantics, same zombie-safety
-guarantees. The difference is purely internal: ``trio`` tasks in
-that process can start and drive ``asyncio`` tasks through the
-``tractor.to_asyncio`` API.
-
-Spawning an infected subactor
------------------------------
-Just flip the flag on :meth:`tractor.ActorNursery.start_actor`:
-
-.. code:: python
-
-    async with tractor.open_nursery() as an:
-        portal = await an.start_actor(
-            'aio_side',
-            enable_modules=[__name__],
-            infect_asyncio=True,
-        )
-
-The one-shot convenience ``ActorNursery.run_in_actor()`` accepts
-the same flag. The ``to_asyncio`` APIs may **only** be called from
-tasks inside an infected actor; calling them anywhere else raises
-a loud ``RuntimeError``. You can introspect at runtime with
-``tractor.current_actor().is_infected_aio()``.
-
-Linking tasks with ``open_channel_from()``
-------------------------------------------
-The core primitive is :func:`tractor.to_asyncio.open_channel_from`,
-an async context manager which starts your ``asyncio`` function as
-a real ``asyncio.Task`` and yields a two-way channel linking it to
-the calling ``trio`` task:
-
-.. code:: python
-
-    from tractor import to_asyncio
-
-    async with to_asyncio.open_channel_from(
-        aio_main,        # async def aio_main(chan, **kwargs)
-        period=0.5,      # extra kwargs are passed through
-    ) as (chan, first):
-        await chan.send('tick')
-
-The semantics deliberately mirror the inter-actor ``Context``
-handshake from :doc:`/guide/context`:
-
-- the target fn must declare a parameter literally named ``chan``;
-  the runtime injects the shared
-  :class:`~tractor.to_asyncio.LinkedTaskChannel` by keyword.
-- the ``trio`` side blocks at entry until the ``asyncio`` task
-  calls ``chan.started_nowait(value)``; that value is delivered as
-  ``first``, exactly like the ``(ctx, first)`` pair you get from
-  ``Portal.open_context()`` after the child calls
-  ``ctx.started()``.
-- a first value **must** be sent from the ``asyncio`` side or the
-  ``trio`` side will never unblock.
-- on block exit the pair is torn down *together*; neither task can
-  outlive the other (more on this below).
-
-A full example: the echo server
--------------------------------
-Here's the canonical demo, a round-trip echo service where the
-``asyncio`` task is told what to do by a ``trio`` task which is in
-turn driven over IPC by the root actor:
-
-.. literalinclude:: ../../examples/infected_asyncio_echo_server.py
-   :caption: examples/infected_asyncio_echo_server.py
-   :language: python
-
-What's going on?
-
-- there are three task layers: the root actor's pure ``trio``
-  task, the infected child's ``trio``-side ``@tractor.context``
-  endpoint (``trio_to_aio_echo_server()``), and the child's
-  ``asyncio`` task (``aio_echo_server()``).
-- two ``started``-style handshakes compose: the aio task's
-  ``chan.started_nowait('start')`` unblocks the child's
-  ``open_channel_from()`` entry, then the child relays that same
-  value up via ``await ctx.started(first)`` which unblocks the
-  root's ``open_context()`` entry. Synchronization all the way
-  down, er, up.
-- each round trip flows: root ``stream.send()`` -> IPC -> child
-  ``async for msg in stream`` -> ``chan.send(msg)`` -> aio
-  ``await chan.get()`` -> ``chan.send_nowait()`` -> child
-  ``chan.receive()`` -> ``stream.send(out)`` -> IPC -> root.
-- when the root breaks out of its stream loop and exits the
-  context block, the child's stream ends, its channel block exits,
-  and the ``asyncio`` task is reaped along with it; the final
-  ``portal.cancel_actor()`` then tears down the whole process. No
-  orphaned ``asyncio`` tasks, no zombie procs; if you manage to
-  create either it **is a bug**.
-
-``LinkedTaskChannel``: one channel, two sides
----------------------------------------------
-The same channel object is shared by both tasks; which methods you
-call depends on which loop schedules your task. The ``trio`` side
-gets a standard ``trio.abc.Channel`` interface while the
-``asyncio`` side gets queue-flavored, mostly-sync methods:
-
-.. list-table::
-   :header-rows: 1
-   :widths: 14 36 50
-
-   * - side
-     - call
-     - what it does
-   * - ``trio``
-     - ``await chan.send(item)``
-     - ship ``item`` to the ``asyncio`` task (enqueues onto an
-       internal ``asyncio.Queue``).
-   * - ``trio``
-     - ``await chan.receive()``
-     - wait for the next value from the ``asyncio`` side; the
-       channel also supports ``async for``.
-   * - ``trio``
-     - ``await chan.wait_for_result()``
-     - block until the ``asyncio`` task completes; return its
-       final result or raise its (translated) error.
-   * - ``trio``
-     - ``chan.subscribe()``
-     - acm yielding a ``BroadcastReceiver`` so N local tasks can
-       each consume a copy of the inbound stream (see below).
-   * - ``trio``
-     - ``chan.cancel_asyncio_task()``
-     - explicitly request cancellation of the linked ``asyncio``
-       task.
-   * - ``asyncio``
-     - ``chan.started_nowait(value)``
-     - deliver the "first" value; unblocks the ``trio`` side's
-       ``open_channel_from()`` entry (mirrors ``ctx.started()``).
-   * - ``asyncio``
-     - ``await chan.get()``
-     - wait for the next value sent from the ``trio`` side.
-   * - ``asyncio``
-     - ``chan.send_nowait(item)``
-     - push a value to the ``trio`` side without blocking.
-
-Fan-out with ``.subscribe()``
-*****************************
-Just like :meth:`tractor.MsgStream.subscribe` does for IPC
-streams, ``chan.subscribe()`` lets multiple local ``trio`` tasks
-each receive *every* value sent from the single ``asyncio`` task:
-
-.. code:: python
-
-    async with chan.subscribe() as bcast:
-        async for msg in bcast:
-            ...
-
-The underlying broadcast machinery is lazily allocated on first
-use and is *not* reversible for the channel's remaining lifetime,
-so only reach for it when you actually want the fan-out.
-
-One-shot calls with ``run_task()``
-----------------------------------
-When you just want a single ``asyncio`` result and no streaming
-dialog, skip the channel ceremony and use
-:func:`tractor.to_asyncio.run_task`:
-
-.. code:: python
-
-    import asyncio
-    from tractor import to_asyncio
-
-    async def aio_fetch(url: str) -> str:
-        await asyncio.sleep(0.3)   # pretend-IO, aio style
-        return f'<html>sup {url}</html>'
-
-    # from any trio task inside the infected actor:
-    page = await to_asyncio.run_task(aio_fetch, url='https://x.io')
-
-It schedules the fn as an ``asyncio.Task``, waits for completion
-and hands the return value back to ``trio``; think of it as the
-cross-loop sibling of ``ActorNursery.run_in_actor()``. Errors and
-cancellation are translated exactly as for channels.
-
-Cross-loop errors and cancellation
-----------------------------------
-The paired tasks are *SC linked*: exception and cancel handling
-tears down **both** sides on any unexpected error or cancellation,
-in either loop. There is no fire-and-forget mode; a
-``LinkedTaskChannel`` is a supervision scope just like a
-``Context`` is across processes.
-
-Because each loop has its own (incompatible) cancellation and exit
-machinery, boundary crossings are translated into dedicated
-exception types, all importable from ``tractor.to_asyncio``:
-
-.. list-table::
-   :header-rows: 1
-   :widths: 26 22 52
-
-   * - exception
-     - raised in
-     - meaning
-   * - ``AsyncioCancelled``
-     - the ``trio`` task
-     - the linked ``asyncio`` task was cancelled by itself or
-       a 3rd party (i.e. *not* by the ``trio`` side).
-   * - ``AsyncioTaskExited``
-     - the ``trio`` task
-     - the ``asyncio`` task returned/exited early while the
-       ``trio`` side still held the link open.
-   * - ``TrioCancelled``
-     - the ``asyncio`` task
-     - the ``trio`` side was cancelled (or crashed) so the
-       ``asyncio`` task is being torn down per SC rules.
-   * - ``TrioTaskExited``
-     - the ``asyncio`` task
-     - the ``trio`` side exited gracefully while the ``asyncio``
-       task was still running; a "clean shutdown" signal much
-       like closing a ``trio`` mem-chan.
-
-By default ``open_channel_from(suppress_graceful_exits=True)``
-absorbs the two ``*TaskExited`` signals so happy-path teardown
-stays silent; pass ``False`` when your app wants to handle early
-peer-exit explicitly.
-
-Past the task pair, everything composes with the normal actor
-story: an unhandled ``asyncio`` error is translated into the
-``trio`` side, propagates out of your ``@tractor.context``
-endpoint, and arrives at the parent boxed as
-a :class:`tractor.RemoteActorError`. One SC discipline,
-end-to-end, across loops *and* processes.
-
-Breakpoints in ``asyncio`` tasks
---------------------------------
-Yes, the multi-actor REPL works here too. With
-``debug_mode=True`` enabled on your tree the ``trio`` side of an
-infected actor can ``await tractor.pause()`` as usual, and with
-greenback enabled (``maybe_enable_greenback=True``) even the
-builtin ``breakpoint()`` works from *inside* ``asyncio`` tasks;
-see ``examples/debugging/asyncio_bp.py`` for the full tour. The
-root-TTY locking dance behind all this is covered in
-:doc:`/guide/debugging`.
-
-Where to next?
---------------
-.. seealso::
-
-   - :doc:`/guide/context` for the inter-actor handshake and
-     streaming APIs which this whole interop layer mirrors.
-   - :doc:`/guide/msging` for typing the payloads you shuttle
-     between actors (and loops).
-   - :doc:`/guide/debugging` for the multi-process REPL that
-     keeps working even when your loop has "the trios".
-
-.. _trio: https://github.com/python-trio/trio
-.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops
-.. _#273: https://github.com/goodboy/tractor/issues/273

docs/guide/cancellation.rst

@@ -1,285 +0,0 @@
-Cancellation and error propagation
-==================================
-
-``tractor`` supports ``trio``'s cancellation_ system *verbatim*,
-then extends it across process boundaries. If you know how to
-cancel a task in ``trio`` you already know how to cancel an actor —
-and its whole subtree — in ``tractor``; the runtime's job is making
-that statement hold over IPC with every structured concurrency (SC)
-guarantee intact.
-
-The ground rules,
-
-- a remote actor is **never** cancelled unless explicitly requested
-  (by a parent or peer), unless supervision demands it (an error
-  triggered one-cancels-all teardown), or unless there's a bug in
-  ``tractor`` itself (please report it!),
-- (remote) errors `always propagate`_ back to the parent
-  supervisor; nothing is silently dropped on the floor,
-- every spawned process gets reaped no matter how it dies; if you
-  can create a zombie child process (without using a system signal)
-  it **is a bug**.
-
-``trio`` cancellation, across the wire
---------------------------------------
-
-Locally everything is bog-standard ``trio``: nurseries, cancel
-scopes, timeouts. ``tractor`` adds exactly one twist: a cancel
-scope can't physically reach into another process, so the runtime
-*relays cancellation as messages*. Concretely,
-
-- cancelling an *actor* means sending it a runtime-cancel request
-  msg; the target then runs its own graceful teardown — cancelling
-  RPC tasks, closing channels, exiting its :func:`trio.run` — and
-  acks the request back to the canceller,
-- cancelling a single *cross-actor task* works through the
-  :class:`tractor.Context` layer: each ``ctx`` task-pair is
-  cancel-scope-linked over IPC such that either side erroring or
-  cancelling relays an equivalent error to the other side (see
-  :doc:`/guide/context` for the gory details),
-- a cancel is therefore always a *request with an ack*: the
-  canceller does a **bounded wait** for confirmation and escalates
-  if the peer is unresponsive (see the teardown ladder below).
-
-One-cancels-all supervision
----------------------------
-
-An :class:`tractor.ActorNursery` supervises subactors `exactly like
-trio`_ nurseries supervise tasks: when one child errors, the error
-propagates to the supervising block and **all** sibling subactors
-get cancelled before the error continues bubbling up the (process)
-tree.
-
-.. d2:: diagrams/error_propagation.d2
-   :caption: One-cancels-all: no zombies, no lost errors.
-   :alt: error propagation up a subactor tree
-   :width: 80%
-
-.. literalinclude:: ../../examples/remote_error_propagation.py
-   :caption: examples/remote_error_propagation.py
-   :language: python
-
-What's going on here?
-
-- three healthy actors are spawned as daemons via
-  :meth:`tractor.ActorNursery.start_actor`; left alone they'd
-  happily idle forever,
-- a fourth actor runs ``assert_err()`` via ``.run_in_actor()`` and
-  promptly trips its ``assert 0``,
-- the resulting ``AssertionError`` ships back over IPC as a
-  serialized error msg and re-raises *boxed* inside the nursery
-  block as a :class:`tractor.RemoteActorError`,
-- the nursery reacts like any ``trio`` nursery would: it cancels
-  the three healthy siblings (graceful runtime-cancel requests,
-  acks awaited), reaps all four processes, then re-raises,
-- ``trio.run(main)`` sees that same ``RemoteActorError`` in the
-  parent-most process — propagation is end-to-end or bust.
-
-This one-cancels-all style is currently the *only* supervision
-strategy offered (it's the one ``trio`` gives you); more
-`erlang strategies`_ are roadmap, see the bottom of this page.
-
-The boxed-error bestiary
-------------------------
-
-All remote failures arrive locally as one of a small set of
-exception types, each carrying enough metadata to work out *who*
-failed, *where*, and *why*.
-
-``RemoteActorError``
-********************
-
-The workhorse: a "boxed" exception relayed over IPC from another
-actor. The original error's type, traceback string and msgdata are
-preserved so you can pattern-match on what actually went wrong
-remotely,
-
-- ``.boxed_type``: the reconstructed **type** of the original
-  remote exception (``ValueError``, ``NameError``, what have you),
-- ``.src_uid``: the ``(name, uuid)`` pair of the actor where the
-  error *originated*,
-- ``.relay_uid`` / ``.relay_path``: when an error crosses more than
-  one actor boundary (grandchild -> child -> root) every relaying
-  actor is recorded; multi-hop boxings are lovingly referred to as
-  "inceptions" in the runtime internals,
-- ``.pformat()``: a rich "tb box" rendering of the remote traceback
-  for your logs or REPL.
-
-.. code:: python
-
-    try:
-        async with portal.open_context(ep) as (ctx, first):
-            ...
-    except tractor.RemoteActorError as rae:
-        if rae.boxed_type is ValueError:
-            ...  # the remote task raised `ValueError`
-
-``ContextCancelled``
-********************
-
-The cancel-ack for a cross-actor task pair: raised when a
-:class:`tractor.Context` task is cancelled *by request*. Its
-``.canceller`` attr is the uid of the actor which **requested** the
-cancel, which powers the key rule,
-
-- if **you** requested it (you called
-  :meth:`tractor.Context.cancel`) the resulting ctxc is *absorbed*
-  at ``open_context()`` exit: an expected outcome, not an error,
-- if **anyone else** did — the peer task, or some third-party actor
-  — it *raises* locally so your code always hears about it.
-
-The full self- vs. cross-cancel semantics are a core teaching point
-of :doc:`/guide/context`; go read them there.
-
-``MsgTypeError``
-****************
-
-An IPC-payload "type error": a msg violated the dialog's declared
-payload spec. See :doc:`/guide/msging` for the typed-messaging
-system which enforces it.
-
-``TransportClosed``
-*******************
-
-The underlying IPC transport (TCP stream, UDS socket, ...) died or
-closed out from under a channel. You'll normally only see this
-surface when a peer hard-exits without any graceful runtime
-teardown; the supervision machinery treats unexpected transport
-loss on a busy channel as a failure and tears down accordingly.
-
-Pick your blast radius
-----------------------
-
-Three cancel surfaces, three scopes of effect; choose the smallest
-hammer that does the job.
-
-.. list-table::
-   :header-rows: 1
-   :widths: 36 34 30
-
-   * - surface
-     - cancels
-     - typical use
-   * - :meth:`tractor.ActorNursery.cancel`
-     - every subactor in the nursery
-     - whole-tree teardown
-   * - :meth:`tractor.Portal.cancel_actor`
-     - one actor: full runtime + proc
-     - daemon teardown
-   * - :meth:`tractor.Context.cancel`
-     - exactly one remote task
-     - surgical task cancel
-
-``ActorNursery.cancel()``
-*************************
-
-The big red button: gracefully cancel every subactor supervised by
-the nursery, in parallel, with the escalation discipline below
-applied per-child. It's invoked for you whenever an error hits the
-nursery block (one-cancels-all); call it yourself for an orderly
-early shutdown. Passing ``hard_kill=True`` skips the graceful phase
-and goes straight to OS-level process termination — rarely what you
-want outside tests.
-
-``Portal.cancel_actor()``
-*************************
-
-Cancel one **whole actor**: its entire runtime, every task it's
-scheduled, and (for subactors) the OS process, via a graceful
-runtime-cancel request,
-
-.. code:: python
-
-    await portal.cancel_actor()    # bounded wait, bool result
-    await portal.cancel_actor(
-        raise_on_timeout=True,     # no ack in time?
-    )                              # -> `ActorTooSlowError`
-
-The wait for the peer's ack is *bounded* (default
-``Portal.cancel_timeout = 0.5`` seconds, tunable per call via
-``timeout=``). By default a missed ack just returns ``False``; with
-``raise_on_timeout=True`` you instead get an ``ActorTooSlowError``
-(from ``tractor._exceptions``) so *your* code can escalate per SC
-discipline — exactly what the nursery's own teardown does
-internally before resorting to OS-level signalling.
-
-Note the granularity: this cancels an **actor**, not a task. For
-one remote task use the ``Context`` layer instead.
-
-``Context.cancel()``
-********************
-
-Request cancellation of exactly one remote task: the peer task of
-an open :class:`tractor.Context`. Two things to keep straight,
-
-- it cancels the **remote** side only; a ``Context`` is *not* a
-  :class:`trio.CancelScope` and your local task keeps running until
-  you exit the ``open_context()`` block,
-- the resulting :class:`tractor.ContextCancelled` is absorbed
-  locally (you asked for it, after all) per the self- vs.
-  cross-cancel rule above.
-
-Again, :doc:`/guide/context` covers this dance in depth.
-
-Graceful first, hard as a last resort
--------------------------------------
-
-.. margin:: REPL-safe by design
-
-   The hard-kill path is *skipped* whenever an actor in the tree
-   holds the debug-REPL lock (``debug_mode=True`` flavors):
-   SIGTERM raining down on a tree mid-``pdb`` session would
-   clobber your prompt. See :doc:`/guide/debugging`.
-
-Every process teardown in ``tractor`` walks the same escalation
-ladder, top rung first,
-
-1. **graceful cancel request**: a runtime-cancel msg over IPC; the
-   target actor cancels its tasks, closes its channels and exits
-   its :func:`trio.run` cleanly,
-2. **soft wait**: the parent waits (bounded) for the child process
-   to exit on its own,
-3. **SIGTERM**: no ack within the bounded wait (internally an
-   ``ActorTooSlowError``) escalates to ``proc.terminate()``,
-4. **SIGKILL ultimatum**: still alive after the hard-kill timeout
-   (~1.6s)? The runtime logs that the "T-800" has been deployed to
-   collect the zombie and issues ``proc.kill()``. No survivors.
-
-The result is the **no-zombies guarantee**: ``tractor`` tries to
-protect you from zombies, no matter what. Quoting the project
-manifesto,
-
-    If you can create zombie child processes (without using
-    a system signal) it **is a bug**.
-
-Run the quickstart's self-destructing process-tree demo
-(``examples/parallelism/we_are_processes.py``, walked through in
-:doc:`/start/quickstart`) under a ``pstree`` watcher and try to
-catch a
-straggler; we'll wait B)
-
-Roadmap: ``erlang``-style strategies
-------------------------------------
-
-One-cancels-all is ``trio``'s strategy and, for now, the only one
-``tractor`` ships. Pluggable `erlang strategies`_ — one-for-one
-restarts, rest-for-one, transient/permanent child specs and friends
-(see the `supervision strategies`_ canon) — are a long-standing
-roadmap item tracked in `#22`_. If supervisors are your jam that
-issue is the place to sling opinions.
-
-.. seealso::
-
-   - :doc:`/guide/context` — the cross-actor task layer where
-     per-task cancellation actually lives,
-   - :doc:`/guide/msging` — the typed msg layer that raises
-     :class:`tractor.MsgTypeError`,
-   - :doc:`/guide/debugging` — what cancellation does (and very
-     carefully does *not* do) while a REPL is up.
-
-.. _cancellation: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-and-timeouts
-.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
-.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
-.. _erlang strategies: https://learnyousomeerlang.com/supervisors
-.. _supervision strategies: https://www.erlang.org/doc/system/sup_princ.html
-.. _#22: https://github.com/goodboy/tractor/issues/22

docs/guide/clustering.rst

@@ -1,127 +0,0 @@
-Higher-level cluster APIs
-=========================
-
-Sometimes you don't want a hand-crafted supervision tree; you want
-"a pile of workers, one per core, now please". For that there's
-:func:`tractor.open_actor_cluster`: a convenience wrapper which
-spawns a *flat* cluster of subactors and hands you back a portal to
-each,
-
-.. code:: python
-
-    @acm
-    async def open_actor_cluster(
-        modules: list[str],            # RPC allowlist for workers
-        count: int = cpu_count(),      # one per core by default
-        names: list[str]|None = None,  # default: 'worker_{i}'
-        hard_kill: bool = False,       # fwd to `an.cancel()`
-        **runtime_kwargs,              # fwd to `open_root_actor()`
-    ) -> AsyncGenerator[dict[str, tractor.Portal], None]:
-
-A cluster in one block
-----------------------
-
-.. literalinclude:: ../../examples/quick_cluster.py
-   :caption: examples/quick_cluster.py
-   :language: python
-
-Walkthrough,
-
-- ``open_actor_cluster(modules=[__name__])`` concurrently spawns
-  one subactor per detected core (per
-  :func:`multiprocessing.cpu_count`); the ``modules`` list is the
-  usual ``enable_modules``-style capability allowlist so workers
-  may run functions defined in this module,
-- it yields a ``dict[str, tractor.Portal]`` mapping worker name to
-  portal; note the keys get prefixed with the *spawning* actor's
-  name, so from the root you'll see ``'root.worker_0'``,
-  ``'root.worker_1'``, etc.,
-- a plain :class:`trio.Nursery` then fans out one
-  ``portal.run(sleepy_jane)`` per worker; each prints its actor
-  ``.uid`` from inside its own process then naps forever — what
-  runs *inside* each worker (and how many tasks you point at it)
-  is entirely yours to compose,
-- ``tractor.trionics.collapse_eg()`` un-nests the strict
-  ``ExceptionGroup`` wrapping so the demo's ``KeyboardInterrupt``
-  surfaces as itself instead of arriving eg-boxed,
-- on block exit the whole fleet is torn down for you via
-  :meth:`tractor.ActorNursery.cancel`; pass ``hard_kill=True`` at
-  open time to skip straight to OS-level termination instead of
-  the graceful ladder described in :doc:`/guide/cancellation`.
-
-Sizing, naming, fleet-wide options
-----------------------------------
-
-``count`` doesn't have to be core-count and the auto-generated
-``'worker_{i}'`` names are just the default; pass your own (the
-length must match ``count`` or you get a ``ValueError``). Any
-extra ``**runtime_kwargs`` pass through verbatim to
-:func:`tractor.open_root_actor`, so fleet-wide runtime options are
-one kwarg away,
-
-.. code:: python
-
-    async with tractor.open_actor_cluster(
-        modules=['mylib.workers'],
-        count=4,
-        names=['scout', 'miner', 'smelter', 'smith'],
-        debug_mode=True,    # whole-fleet crash-to-REPL
-    ) as portal_map:
-        ...
-
-From here the composition patterns are the usual ``tractor`` fare:
-``portal.run()`` for one-shot calls (as in the demo), or — for a
-persistent bidirectional dialog per worker — concurrently enter N
-``portal.open_context()`` blocks with
-``tractor.trionics.gather_contexts()``; see :doc:`/guide/context`
-for that whole layer.
-
-Clusters vs. nurseries
-----------------------
-
-.. d2:: diagrams/actor_tree.d2
-   :margin:
-   :caption: The general shape: arbitrary nesting. A cluster is
-       this, minus the nesting.
-   :alt: a nested supervision tree of subactors
-
-``open_actor_cluster()`` is sugar, not a new primitive: under the
-hood it's just :func:`tractor.open_nursery` plus N concurrent
-``start_actor()`` calls plus a ``.cancel()`` on the way out. Reach
-for it when,
-
-- you want a *flat*, homogeneous fleet (classic worker-pool or
-  map-style fan-out shapes),
-- "one per core" — or a fixed ``count`` — is the right sizing
-  story,
-- every child can share the same spawn options.
-
-Drop down to a raw :class:`tractor.ActorNursery` when the topology
-gets any fancier: nested trees, heterogeneous children, per-child
-``debug_mode``/transport/module options, daemons mixed with
-one-shot workers, and so on (see :doc:`/guide/parallelism` for a
-hand-rolled pool). Either way the supervision semantics are
-identical: one-cancels-all error propagation and the no-zombies
-guarantee from :doc:`/guide/cancellation` apply to clusters too.
-
-Provisional, by design
-----------------------
-
-.. note::
-
-   APIs in this section are considered **provisional**: the
-   signature and semantics of :func:`tractor.open_actor_cluster`
-   may shift as higher-level supervision machinery lands. We
-   encourage you to try it and provide feedback — the
-   `matrix channel`_ is the place to say hi, and `#22`_ tracks the
-   broader supervisor-strategy roadmap.
-
-.. seealso::
-
-   - :doc:`/guide/parallelism` — worker pools built "by hand" with
-     plain actor nurseries (and why that's easy peasy),
-   - :doc:`/guide/cancellation` — the teardown machinery a cluster
-     inherits for free.
-
-.. _matrix channel: https://matrix.to/#/!tractor:matrix.org
-.. _#22: https://github.com/goodboy/tractor/issues/22

docs/guide/context.rst

@@ -1,344 +0,0 @@
-The ``Context``: a cross-actor task pair
-=========================================
-
-If you've written any trio_ you already know the contract: every
-task lives in a nursery, errors always propagate, cancellation is
-scoped, and nothing leaks. ``tractor`` extends that exact contract
-*across processes* — the same guarantees from the seminal
-`blog post`_, just with the nursery split across two memory
-domains. The primitive that does it is :class:`tractor.Context`: a
-**linked pair of tasks**, one in each of two actors, supervised as
-a single `structured concurrency`_ (SC) scope over IPC.
-
-.. d2:: diagrams/context_handshake.d2
-   :caption: The SC-transitive supervision protocol, msg by msg.
-   :alt: sequence diagram of the context handshake msg flow
-
-Pretty much everything else is (or is slated to be) built on this
-one primitive: ``ActorNursery.run_in_actor()`` is a convenience
-for "spawn, open a context, await the result, tear down"; plain
-``Portal.run()`` RPC is planned to be re-implemented on top of it;
-the multi-process debugger's tree-wide REPL lock rides one. Grok
-this page and the rest of the library reads as convenience
-wrappers B)
-
-The endpoint contract
----------------------
-
-A context endpoint is an async function decorated with
-:func:`tractor.context` which declares **a param annotated**
-``tractor.Context`` — any param name you like, the annotation is
-what's required:
-
-.. code:: python
-
-    @tractor.context
-    async def trainer(
-        ctx: tractor.Context,
-        model: str,
-    ) -> str:
-        await ctx.started('ready')
-        return f'trained {model}'
-
-.. margin:: Who am I talking to?
-
-   Inside any context task
-   :func:`tractor.current_ipc_ctx` returns the
-   ``Context`` bound to the current task; handy
-   in helpers that don't take ``ctx`` explicitly.
-
-The parent (aka "opener") side invokes it through a
-:class:`tractor.Portal` using ``Portal.open_context()``, passing
-any extra kwargs which are shipped over the wire as the remote
-task's arguments. Since the target fn is referenced by module
-path, that module must be listed in the peer actor's
-``enable_modules`` allowlist — RPC capability is always opt-in.
-
-The decorator also accepts a ``pld_spec``: a type (union) which
-every payload in the dialog is validated against, upgrading your
-msgs to a typed contract enforced via :exc:`tractor.MsgTypeError`.
-Validation strictness follows the "`cheap or nasty`_"
-`(un)protocol`_ pattern: the one-shot ``Started`` payload gets the
-nasty treatment (stringently round-trip checked before it's even
-sent) while high-rate stream payloads stay cheap (checked only
-receiver side).
-
-The handshake, on the wire
---------------------------
-
-Every context runs one instance of ``tractor``'s "SC-transitive
-supervision protocol": a tiny fixed grammar of msgspec_-typed msgs
-encapsulating *all* RPC dialogs between actors. *Transitive*
-because each IPC link obeys the same rules a local nursery does —
-starts are acked, completion is awaited, errors and cancels always
-relay — so chaining links across a process tree composes into one
-tree-wide SC scope.
-
-The figure up top shows a full dialog; in order:
-
-``Start``
-    sent by ``Portal.open_context()``: "schedule a task running
-    this function with these kwargs".
-
-``StartAck``
-    the peer runtime confirms the task is scheduled and that the
-    endpoint really is a context-style fn.
-
-``Started``
-    emitted when the child task calls
-    :meth:`tractor.Context.started`; carries the first payload
-    and unblocks the parent's entry of ``open_context()``.
-
-``Yield``
-    one per :meth:`tractor.MsgStream.send`, flowing in *either*
-    direction while a stream is open.
-
-``Stop``
-    graceful end-of-stream: the far side's ``async for``
-    terminates cleanly.
-
-``Return``
-    the child fn returned; its value becomes the context's final
-    result. If the child raised instead, an ``Error`` msg takes
-    this slot carrying the boxed traceback.
-
-``ctx.started()``: just like ``task_status.started()``
-*******************************************************
-
-The startup phase is a deliberate clone of
-:meth:`trio.Nursery.start` semantics: the child decides when it's
-"up", optionally handing back a first value, and the parent stays
-blocked until that moment:
-
-.. code:: python
-
-    # trio, in-process
-    first = await nursery.start(child_fn)
-
-    # tractor, cross-process
-    async with portal.open_context(child_fn) as (ctx, first):
-        ...
-
-The ``as (ctx, first)`` tuple is exactly that pair: the
-:class:`tractor.Context` handle plus whatever value the child
-passed to ``await ctx.started(value)``. And readiness is not
-optional — for instance opening a stream before ``.started()``
-has been called raises a ``RuntimeError``; handshake first, then
-dialog.
-
-Bidirectional streaming over a context
---------------------------------------
-
-The canonical ping-pong (design history: `#53`_, `#223`_) — a
-full-duplex msg stream between a parent and its spawned peer:
-
-.. literalinclude:: ../../examples/rpc_bidir_streaming.py
-   :caption: examples/rpc_bidir_streaming.py
-   :language: python
-
-What's going on?
-
-- ``start_actor()`` spawns the daemon-style subactor
-  ``'rpc_server'`` with this very module in its allowlist.
-
-- ``portal.open_context(simple_rpc, data=10)`` fires the
-  ``Start`` msg then blocks until the child task calls
-  ``await ctx.started(data + 1)`` — hence ``sent == 11``.
-
-- both tasks enter ``ctx.open_stream()``: a stream dialog is only
-  fully open once *each* side has entered its block.
-
-- the parent seeds the first ``'ping'``; each side then echoes
-  the other, one ``Yield`` msg per ``stream.send()``.
-
-- after the 9th pong the parent ``break``\ s (10 pings sent in
-  total) and exits its stream block, which sends ``Stop``; the
-  child's ``async for`` completes gracefully and its ``else``
-  clause asserts all 10 pings arrived.
-
-- the 10th in-transit pong? Discarded by the implicit drain at
-  ``open_context()`` exit, which runs the dialog down to the
-  child's ``Return`` (here ``None``).
-
-- daemon actors live until told otherwise:
-  ``portal.cancel_actor()`` reaps the subactor explicitly.
-
-Results: the ``Return`` leg
----------------------------
-
-Every context resolves to a final outcome. Wait on it explicitly
-from the parent side:
-
-.. code:: python
-
-    async with portal.open_context(ep) as (ctx, first):
-        ...
-        result = await ctx.wait_for_result()
-
-or just exit the block — ``__aexit__`` implicitly drains the msg
-flow until the ``Return`` (or ``Error``) arrives, discarding any
-in-transit ``Yield``\ s on the way. Either way the rule of
-`causality`_ holds exactly as in a local nursery: **the opener
-never unblocks before the remote task is done**.
-
-For post-hoc inspection (think supervision/restart logic) the ctx
-also exposes ``Context.outcome``, ``.maybe_error`` and
-``.has_outcome`` — where a "result" might well be the error the
-dialog ended with.
-
-Cancellation semantics
-----------------------
-
-The part you actually came for; read it twice B)
-
-A context's two tasks are **cancel-scope-linked across the IPC
-boundary**: whatever ends one side — error, cancellation, plain
-old return — is relayed such that the other side ends
-equivalently. No silent half-open dialogs, no orphaned remote
-tasks, ever.
-
-``ctx.cancel()`` cancels the *remote* task
-*******************************************
-
-:meth:`tractor.Context.cancel` requests cancellation of the
-**remote** task only:
-
-.. code:: python
-
-    async with portal.open_context(ep) as (ctx, first):
-        await accomplish_things(ctx)
-        await ctx.cancel()  # remote task, NOT me
-
-A :class:`tractor.Context` is **not** a :class:`trio.CancelScope`:
-the call doesn't (and can't) cancel your local task. It sends the
-cancel request and waits a bounded ``timeout`` for the peer
-runtime's ``CancelAck``, then your code proceeds to the block exit
-as normal.
-
-Compare scopes here: ``Portal.cancel_actor()`` is the big hammer
-which cancels the peer's **entire runtime** (and thus process);
-``ctx.cancel()`` is the per-dialog scalpel.
-
-``ContextCancelled`` and the absorption rule
-*********************************************
-
-When a context task gets cancelled *by request* the requestee's
-runtime reports back with a :exc:`tractor.ContextCancelled`
-("ctxc") whose ``.canceller`` field holds the uid of the actor
-which asked. That one field decides what you observe:
-
-**you requested it**
-    i.e. ``ctxc.canceller == tractor.current_actor().uid``: the
-    ctxc is **absorbed** at ``open_context()`` exit — nothing
-    raises in your block. You asked for a graceful stop and got
-    it; if you care, ``await ctx.wait_for_result()`` hands the
-    ctxc back as a plain *value* for inspection.
-
-**anyone else requested it**
-    the peer cancelling itself, or some third actor cancelling it
-    from the side: the ctxc **is raised** in your block. From
-    your scope's perspective a task you depend on was killed out
-    from under you and SC demands you hear about it — exactly
-    like a sibling crash in a `nursery`_.
-
-In code:
-
-.. code:: python
-
-    try:
-        async with portal.open_context(ep) as (ctx, first):
-            ...
-    except tractor.ContextCancelled as ctxc:
-        # can only be a peer- or third-party cancel;
-        # self-requested cancels are absorbed at exit.
-        assert ctxc.canceller != tractor.current_actor().uid
-
-This self- vs cross-cancel split is what makes explicit teardown
-*composable*: a supervisor cancels its dialogs without try/except
-noise, while unexpected cancellation anywhere in the tree still
-propagates loudly like any other failure.
-
-.. warning::
-
-   Once ``ctx.cancel()`` has been called the dialog is done: a
-   subsequent ``ctx.open_stream()`` raises ``RuntimeError``.
-
-For introspection the ctx exposes trio-flavored status props:
-``.cancel_called`` (this side requested), ``.cancel_acked`` (peer
-confirmed), ``.cancelled_caught`` and ``.canceller`` —
-deliberately mirroring :class:`trio.CancelScope` naming.
-
-Errors propagate, both ways
----------------------------
-
-A crash on either end tears down the pair, SC style:
-
-- **child raises**: the exception ships back as an ``Error`` msg
-  and re-raises in the parent block boxed as a
-  :exc:`tractor.RemoteActorError`; the original class rides along
-  as ``.boxed_type`` with ``.src_uid`` naming the crashed actor.
-
-- **parent raises** (or is cancelled) inside the block: an
-  equivalent error/cancel is relayed to the child task so it can
-  never outlive the dialog.
-
-.. code:: python
-
-    try:
-        async with portal.open_context(ep) as (ctx, first):
-            ...
-    except tractor.RemoteActorError as rae:
-        if rae.boxed_type is ValueError:
-            ...  # remote ValueError, type preserved
-
-Errors that hop through intermediary actors on their way up the
-tree ("inceptions" XD) keep the full relay trail in
-``.relay_uid`` / ``.relay_path``. Payloads violating your declared
-``pld_spec`` surface as the IPC analog of a ``TypeError``:
-:exc:`tractor.MsgTypeError`.
-
-Overruns and backpressure
--------------------------
-
-Stream msgs land in a bounded per-context buffer on the receiver
-side. A sender that outpaces a non-consuming receiver *overruns*
-it and the runtime raises ``StreamOverrun`` (from
-``tractor._exceptions``; also a :exc:`trio.TooSlowError`) instead
-of buffering without bound — SC discipline applies to memory too.
-
-Your knobs:
-
-- ``msg_buffer_size`` on ``ctx.open_stream()`` sizes the buffer.
-
-- ``allow_overruns=True`` (on ``Portal.open_context()`` and/or
-  ``ctx.open_stream()``) opts in to absorbing overflow instead of
-  erroring — reasonable for bursty telemetry-ish feeds, just know
-  you're trading the error for extra buffering.
-
-One context, one stream
------------------------
-
-A ``MsgStream`` is strictly **one-shot use**: once it closes —
-gracefully or not, from either side — it can never be re-opened
-on the same ctx. Want another round with the same peer? Open a
-fresh context; they're cheap. The full close-vs-cancel teardown
-story lives in :doc:`/guide/streaming`.
-
-.. rubric:: Where to next?
-
-:doc:`/guide/streaming` covers the rest of the msg-moving story:
-the legacy one-way API, multi-actor pipelines and in-actor
-broadcast fan-out. For exhaustive API detail see
-:class:`tractor.Context`, :class:`tractor.MsgStream` and
-:exc:`tractor.ContextCancelled`.
-
-.. _trio: https://github.com/python-trio/trio
-.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
-.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning
-.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
-.. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
-.. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
-.. _msgspec: https://jcristharif.com/msgspec/
-.. _#53: https://github.com/goodboy/tractor/issues/53
-.. _#223: https://github.com/goodboy/tractor/issues/223

docs/guide/debugging.rst

@@ -1,545 +0,0 @@
-.. _debugging:
-
-================================
-"Native" multi-process debugging
-================================
-
-``tractor`` ships the thing every ``multiprocessing`` user has
-wished for and quietly assumed was impossible: a multi-process
-debugger that *just works*.
-
-Drop ``await tractor.pause()`` — or, with `greenback`_ installed,
-a plain builtin ``breakpoint()`` — anywhere in any actor: the
-root, a child, a grandchild, a sync helper function, even an
-``asyncio`` task inside an "infected" actor. A full-featured
-`pdbp`_ REPL opens *in that process*, with syntax-highlighted
-source listings, tab completion and sticky mode, attached to your
-one terminal.
-
-Under the hood every REPL entry acquires a tree-global tty mutex
-via an IPC request to the root actor, so prompts from concurrent
-pauses and crashes never interleave. ``ctrl-c`` is shielded while
-any REPL is live, so a stray ``SIGINT`` can't vaporize the tree
-out from under you. And in debug mode any uncaught error drops
-you into a crash REPL *first in the failing child*, then again at
-each parent as the boxed :class:`~tractor.RemoteActorError` climbs
-the supervision tree.
-
-No remote-pdb sockets, no ``set_trace()`` port juggling, no
-``ptrace`` attach dance: the debugger semantics you already know,
-transparently extended across an entire process tree. Because
-``tractor`` is a `structured concurrency`_ (SC) runtime, the
-debugger composes with supervision instead of fighting it — quit
-a REPL and errors keep propagating exactly like `trio`_ taught
-you, ending in clean, zombie-free teardown.
-
-We're pretty sure it's the (first ever?) "native" debugging UX
-for multi-process Python B)
-
-Enabling debug mode
--------------------
-
-Pass ``debug_mode=True`` to your runtime entrypoint, either
-:func:`tractor.open_nursery` (which forwards it to the implicitly
-opened root actor) or :func:`tractor.open_root_actor` directly:
-
-.. code:: python
-
-    async with tractor.open_nursery(
-        debug_mode=True,    # arm the whole actor tree
-    ) as an:
-        ...
-
-This arms the debug machinery *tree-wide*:
-
-- crash handling is enabled in every actor: uncaught errors enter
-  a REPL before they propagate,
-- the internal tty-lock module is auto-exposed over RPC to every
-  subactor (this is what makes the one-terminal handoff work),
-- console logging is bumped to include ``PDB``-level status msgs
-  so you can see REPL acquire/release events as they happen.
-
-You can instead flip it on for just one child, letting its
-siblings crash-and-burn the normal way:
-
-.. code:: python
-
-    portal = await an.start_actor(
-        'sketchy_worker',
-        debug_mode=True,    # OR-ed with the tree-wide flag
-    )
-
-See ``examples/debugging/per_actor_debug.py`` for a runnable
-proof of the selective style.
-
-.. note::
-
-   Debug mode requires the child-side runtime to be
-   ``trio``-native so that the tty-lock IPC dialog works; it's
-   currently supported on the ``'trio'`` (default) and
-   ``'main_thread_forkserver'`` spawn backends and raises
-   ``RuntimeError`` for any other ``start_method``.
-
-Your first pause point
-----------------------
-
-:func:`tractor.pause` is the SC-aware, multi-process spelling of
-the stdlib's ``breakpoint()``. In the root actor it looks almost
-boring:
-
-.. literalinclude:: ../../examples/debugging/root_actor_breakpoint.py
-   :caption: examples/debugging/root_actor_breakpoint.py
-   :language: python
-
-Run it and you get a ``(Pdb+)`` prompt parked on the ``pause()``
-line; type ``c`` (continue) and the program finishes normally.
-
-The exact same call works from *any* subactor, no matter how deep
-in the tree:
-
-.. literalinclude:: ../../examples/debugging/subactor_breakpoint.py
-   :caption: examples/debugging/subactor_breakpoint.py
-   :language: python
-
-Each loop iteration the child actor requests the terminal from
-the root over IPC, REPLs you, then releases it on ``c``. Pause
-points are re-entrant-safe: repeat calls from the same task are
-no-op'd and other local tasks queue politely for the REPL.
-
-When you get bored, type ``q`` (quit): the resulting
-``bdb.BdbQuit`` is boxed and shipped to the parent like any other
-remote error XD — causality is preserved even for your debugging
-mistakes.
-
-Crash REPLs: errors climb the tree
-----------------------------------
-
-Pause points are only half the story. With debug mode armed, any
-*uncaught* error anywhere in the tree triggers what we call crash
-handling mode:
-
-.. literalinclude:: ../../examples/debugging/subactor_error.py
-   :caption: examples/debugging/subactor_error.py
-   :language: python
-
-What happens when the child hits that (very intentional)
-``NameError``:
-
-1. a REPL opens **in the crashed child first** — you inspect the
-   raising frame, its locals, the works, right inside the failed
-   process,
-2. when you quit, the error is boxed into a
-   :class:`~tractor.RemoteActorError` and relayed to the parent,
-3. the parent (here the root) gets *its own* crash REPL with the
-   rendered remote traceback,
-4. quit again and the nursery tears the tree down — errors keep
-   propagating per SC rules, no zombies left behind.
-
-You debug the failure at every hop of the supervision tree, which
-for multi-hop trees means you can chase an error from the leaf
-that raised it all the way up to the root that supervises it.
-
-Need to skip REPL entry for certain exceptions? Pass a predicate
-via ``open_root_actor(debug_filter=...)``; by default
-cancellation-only exception (groups) don't engage the REPL.
-
-One terminal, many actors
--------------------------
-
-So how do N processes share one tty without garbling it? The root
-actor owns stdio for the whole tree and guards it with a FIFO
-mutex; every subactor REPL entry is an IPC lock request to the
-root. Exactly one actor-task in the entire tree can own the
-terminal at a time, so prompts never interleave — ever.
-
-.. d2:: diagrams/debug_lock.d2
-   :caption: Every REPL entry serializes through the root actor's
-       tty lock; ``continue``-ing one REPL hands the terminal to
-       the next waiter, FIFO style.
-   :alt: sequence diagram of two subactors serializing pdb REPL
-       access through the root actor's tty lock
-
-The runtime's teardown paths cooperate too: a cancelling parent
-always waits for any live REPL to release before reaping
-children, so the debugger never gets yanked out from under you
-mid-keystroke.
-
-.. margin:: Watch the tree live
-
-   Run any of these examples with a process-tree watcher in a
-   second terminal and watch actors come and go::
-
-       watch -n 0.1 "pstree -a $$"
-
-Here's the showpiece: one daemon child re-entering
-``tractor.pause()`` forever inside a stream, while its sibling
-repeatedly raises a ``NameError``:
-
-.. literalinclude:: ../../examples/debugging/multi_daemon_subactors.py
-   :caption: examples/debugging/multi_daemon_subactors.py
-   :language: python
-
-What you'll actually see
-************************
-
-Running it looks *roughly* like this (uids, tracebacks and source
-listings elided; REPL order can vary with who wins the lock
-race)::
-
-    $ python examples/debugging/multi_daemon_subactors.py
-
-    Opening a pdb REPL in paused actor: ('bp_forever', '<uuid>')
-    <highlighted source around the `await tractor.pause()` line>
-    (Pdb+) c
-
-    Opening a pdb REPL in crashed actor: ('name_error', '<uuid>')
-    <live traceback: NameError: name 'doggypants' is not defined>
-    (Pdb+) q
-
-    Opening a pdb REPL in crashed actor: ('root', '<uuid>')
-    <boxed RemoteActorError traceback relayed from 'name_error'>
-    (Pdb+) q
-
-Two (then three) processes, one terminal, zero confusion:
-``c``-ing out of the paused daemon's REPL releases the tty lock,
-which immediately hands the prompt to the crashed sibling; quit
-that and the error propagates as a fully-rendered
-:class:`~tractor.RemoteActorError` to the parent where one final
-crash REPL catches it before clean, zombie-free teardown.
-
-For maximum drama run
-``multi_nested_subactors_error_up_through_nurseries.py`` (under
-``examples/debugging/``) which pulls the same trick across a
-*three-deep* process tree — the tty lock keeps every prompt
-orderly the whole way up.
-
-Post-mortem, on demand
-----------------------
-
-Crash handling is automatic, but you can also enter a REPL on
-a live exception *manually* with :func:`tractor.post_mortem` —
-the actor-aware equivalent of ``pdb.post_mortem()`` — from inside
-any ``except`` block in any actor (kwargs: ``tb=`` for an
-explicit traceback, plus ``shield=`` and ``hide_tb=``):
-
-.. literalinclude:: ../../examples/debugging/pm_in_subactor.py
-   :caption: examples/debugging/pm_in_subactor.py
-   :language: python
-
-This example demos three REPL entries from one error:
-
-- the child's manual ``post_mortem()`` inside its ``except``,
-- the runtime's automatic crash handler in the same child once
-  the error re-raises out of the RPC task,
-- a manual ``post_mortem()`` in the parent on the received
-  :class:`~tractor.RemoteActorError`, whose ``.boxed_type``
-  faithfully reports the original ``NameError``.
-
-Pausing from sync code
-----------------------
-
-No ``await``? No problem. :func:`tractor.pause_from_sync` brings
-the same tree-aware REPL to plain synchronous functions — handy
-when the suspect code is three helpers deep and decidedly not
-async.
-
-It's powered by `greenback`_, which is optional, so you need to:
-
-1. install it (it ships in ``tractor``'s ``sync_pause``
-   dependency group),
-2. enable it at runtime entry:
-
-.. code:: python
-
-    async with tractor.open_nursery(
-        debug_mode=True,
-        maybe_enable_greenback=True,
-    ) as an:
-        ...
-
-With that armed, sync code can pause from three different caller
-environments: the main ``trio`` thread, ``trio.to_thread`` bg
-threads, and (see the next section) ``asyncio`` tasks in infected
-actors. The greenback "portal" hops back into the ``trio`` loop
-to do the lock/REPL dance on your behalf:
-
-.. literalinclude:: ../../examples/debugging/sync_bp.py
-   :caption: examples/debugging/sync_bp.py (the sync fn, excerpt)
-   :language: python
-   :pyobject: sync_pause
-
-.. literalinclude:: ../../examples/debugging/sync_bp.py
-   :caption: examples/debugging/sync_bp.py (called in a subactor,
-       excerpt)
-   :language: python
-   :pyobject: start_n_sync_pause
-
-The full script also exercises the hairier root-actor bg-thread
-cases (and documents their remaining sharp edges) if you want the
-deep lore.
-
-The builtin ``breakpoint()`` override
-*************************************
-
-When debug mode boots with greenback available, ``tractor`` wires
-Python's `PEP 553`_ hook so the *builtin* ``breakpoint()`` becomes
-the actor-aware sync pause, by exporting::
-
-    PYTHONBREAKPOINT=tractor.devx.debug._sync_pause_from_builtin
-
-That means third-party and legacy code containing bare
-``breakpoint()`` calls debugs correctly inside your actor tree
-with zero edits (the override even forwards kwargs like
-``hide_tb`` to the underlying pause machinery, as shown in the
-excerpt above).
-
-.. warning::
-
-   Without greenback (or with ``maybe_enable_greenback=False``,
-   the default), ``debug_mode=True`` instead *blocks* the builtin
-   ``breakpoint()``: ``sys.breakpointhook`` is swapped for a
-   raiser and ``PYTHONBREAKPOINT=0`` is set. A naive
-   ``breakpoint()`` from some random process would clobber the
-   shared tty, so we'd rather hand you a loud ``RuntimeError``
-   with install instructions.
-
-Both the hook and the env var are restored to their prior values
-on runtime exit — see
-``examples/debugging/restore_builtin_breakpoint.py`` for the
-proof.
-
-Breakpoints inside ``asyncio`` tasks
-------------------------------------
-
-Yes, even "infected ``asyncio``" actors get the goods. Spawn a
-child with ``infect_asyncio=True`` (``trio`` runs as a guest on
-the ``asyncio`` loop inside it) and, with debug mode + greenback
-armed, every ``asyncio`` task started via ``tractor.to_asyncio``
-is automatically granted a greenback portal — so a plain builtin
-``breakpoint()`` (or ``tractor.pause_from_sync()``) inside an
-``asyncio.Task`` joins the same single-terminal, tree-locked REPL
-flow:
-
-.. literalinclude:: ../../examples/debugging/asyncio_bp.py
-   :caption: examples/debugging/asyncio_bp.py
-   :language: python
-
-Note the interleave: a ``breakpoint()`` on the ``asyncio`` side,
-``tractor.pause()`` on the ``trio`` side of the same actor, and
-another pause up in the root — all serialized through the one tty
-lock with no cross-actor (or cross-event-loop!) clobbering.
-
-One catch: ``asyncio`` tasks spawned *out-of-band* — i.e. not via
-``tractor.to_asyncio``, typically by some third-party aio lib —
-have no portal bestowed, so a sync pause from one raises a loud
-``RuntimeError`` telling you to ``greenback.ensure_portal()``
-first. See :ref:`the caveats <debugging-caveats>` below.
-
-Teardown debugging: the shielded pause
---------------------------------------
-
-`Cancellation`_ is ``trio``'s bread and butter, which raises an
-awkward question: how do you REPL inside an *already-cancelled*
-scope, say while debugging some teardown sequence? A bare
-``pause()`` would itself be cancelled at its next checkpoint.
-
-The answer is ``await tractor.pause(shield=True)``, which wraps
-the lock acquisition and REPL session in a shielded cancel scope
-(``post_mortem(shield=True)`` works the same way):
-
-.. literalinclude:: ../../examples/debugging/shielded_pause.py
-   :caption: examples/debugging/shielded_pause.py
-   :language: python
-
-If you forget, ``tractor`` has your back: an unshielded
-``pause()`` from a cancelled scope fails fast with a hint
-suggesting ``await tractor.pause(shield=True)`` instead of
-silently never REPL-ing.
-
-Go ahead, mash ctrl-c
----------------------
-
-While any REPL is live the runtime installs a custom ``SIGINT``
-handler tree-wide so that a reflexive ``ctrl-c`` (or five) can't
-nuke your debug session:
-
-- the actor that owns the REPL ignores the interrupt and simply
-  re-flushes the prompt — keep mashing, it's fine,
-- the root actor ignores ``SIGINT`` while a still-IPC-connected
-  child holds the tty lock, so the supervisor won't tear down the
-  tree out from under the debugger,
-- if the lock state has gone *stale* — the locking child died or
-  its IPC channel dropped — the root cancels the stale lock scope
-  and restores ``trio``'s default handler, so ``ctrl-c`` works
-  again exactly when it should.
-
-The handler is uninstalled and ``trio``'s own ``SIGINT``
-semantics restored every time a REPL releases (on ``continue`` /
-``quit``).
-
-Live task-tree dumps
---------------------
-
-Sometimes there's no error to catch — the tree is just *hung* and
-you want to know where. For that ``tractor`` integrates
-`stackscope`_: send a signal, get a full ``trio`` task-tree dump
-from every actor in the tree.
-
-Enable it any of three ways:
-
-- ``open_root_actor(enable_stack_on_sig=True)`` (or via
-  ``open_nursery()`` which forwards it),
-- set ``TRACTOR_ENABLE_STACKSCOPE=1`` in the env — it's inherited
-  through the process tree so every (sub)actor arms the handler
-  at boot,
-- call ``tractor.devx.enable_stack_on_sig()`` directly.
-
-It's intentionally *not* gated on ``debug_mode`` so you can leave
-it armed in plain runs. Then, when the hang strikes, signal the
-tree with ``SIGUSR1``.
-
-.. tip::
-
-   No need to hunt down pids — pattern-match the original cmdline
-   with ``pkill``::
-
-       $ pkill --signal SIGUSR1 -f "python example_script.py"
-
-Each actor dumps its entire ``trio`` task tree (full nursery
-recursion via ``stackscope.extract()``) to its tty *and* tees it
-to ``/tmp/tractor-stackscope-<pid>.log`` — so the trace survives
-even under captured-stdio harnesses — then relays the signal on
-to its children, parent-before-child, until the whole tree has
-reported in.
-
-Try it yourself with the demo script, which deliberately hangs a
-subactor in a shielded sleep:
-
-.. literalinclude:: ../../examples/debugging/shield_hang_in_sub.py
-   :caption: examples/debugging/shield_hang_in_sub.py
-   :language: python
-
-(That ``trio.CancelScope(shield=True)`` hang also shows off the
-zombie reaper: ``ctrl-c`` the root and the un-cancellable child
-still gets hard-reaped — if you can create a zombie it **is a
-bug**.)
-
-Crash handling for sync and CLI code
-------------------------------------
-
-All of the above rides on the actor runtime, but crashes don't
-politely wait for ``trio.run()``. For plain sync code — think
-``typer``/``click`` CLI endpoints, config parsing, anything
-pre-runtime — there's a sync context manager that wraps the same
-``pdbp`` post-mortem UX:
-
-.. code:: python
-
-    from tractor.devx import open_crash_handler
-
-    def main():    # any sync code, no runtime required
-        with open_crash_handler() as boxed:
-            run_my_cli_thing()
-
-By default any ``BaseException`` (minus an ``ignore`` set
-defaulting to ``KeyboardInterrupt`` and ``trio.Cancelled``)
-enters the REPL then re-raises on exit; pass
-``raise_on_exit=False`` to suppress instead and introspect the
-``boxed.value`` afterward. The ``catch``/``ignore`` sets and a
-``repl_fixture`` are all tweakable.
-
-For the classic ``--pdb`` CLI-flag pattern use the conditional
-variant:
-
-.. code:: python
-
-    from tractor.devx import maybe_open_crash_handler
-
-    @app.command()    # a `typer` (or `click`) endpoint
-    def cmd(pdb: bool = False):
-        with maybe_open_crash_handler(pdb=pdb):
-            ...
-
-REPL niceties and hooks
------------------------
-
-Every REPL in this guide is a `pdbp`_ instance (the maintained
-fork-and-fix of `pdb++`_) pre-configured by ``tractor``:
-
-- pygments syntax highlighting in listings and tracebacks,
-- tab completion — including an automatic fixup for
-  libedit-compiled CPythons (e.g. ``uv``-distributed pythons),
-- sticky mode available via the ``sticky`` command (off by
-  default),
-- no long-line truncation (terminal resizes behave),
-- the ``(Pdb+)`` prompt, ``ll``, hidden-frames support and the
-  rest of the ``pdb++`` goodies you may already know.
-
-Internal runtime frames are traceback-hidden so the REPL lands
-exactly on *your* ``pause()``-call or crash frame, never on
-``tractor`` guts.
-
-Finally, if your app owns the terminal (TUIs, fullscreen
-dashboards) pass ``repl_fixture=<your ctx mngr>`` to ``pause()``,
-``post_mortem()`` or ``open_crash_handler()``: it's entered just
-before the REPL engages (return ``False`` to skip entry entirely)
-and exited on release — perfect for suspending and restoring your
-screen around a debug session.
-
-.. _debugging-caveats:
-
-Caveats and platform notes
---------------------------
-
-An honest list of the current rough edges:
-
-- **Windows**: the debugger has no CI coverage on windows at all
-  (the entire test module is skipped there); manual testing has
-  shown it *can* work, but you're in uncharted territory —
-  reports welcome!
-- **macOS**: supported but with rough edges: special-cased prompt
-  re-flushing for ``bash``-on-darwin, a few tooling tests skipped
-  on CI, and the AF_UNIX ~104-char socket-path limit forces some
-  examples (like the stackscope demo above) to fall back from
-  ``'uds'`` to ``'tcp'`` transport. Wonder if all of it'll work
-  on OS X? So do we.
-- **CPython 3.14**: ``greenback`` (via ``greenlet``) doesn't
-  support 3.14 yet, so ``pause_from_sync()`` and the builtin
-  ``breakpoint()`` override are effectively 3.13-only for now.
-  The async APIs — ``pause()`` and ``post_mortem()`` — need no
-  greenback and work everywhere.
-- **out-of-band** ``asyncio`` **tasks**: sync pauses from aio
-  tasks *not* spawned via ``tractor.to_asyncio`` raise a
-  ``RuntimeError`` (no greenback portal was bestowed); run
-  ``await greenback.ensure_portal()`` inside such a task first.
-- **nested-tree ctrl-c edges**: ``SIGINT`` relay through
-  intermediary parents that aren't themselves in debug mode still
-  has known rough edges — see `#320`_.
-- **captured stdio**: ``pytest``-style output capture can hang a
-  ``pause()``; use a real terminal (or a pty à la ``pexpect``,
-  which is how ``tractor``'s own suite drives every one of these
-  examples).
-
-Where to next?
---------------
-
-.. seealso::
-
-   - :doc:`/guide/context` — the SC-linked cross-actor task API
-     that all the crash-propagation semantics above ride on.
-   - :func:`tractor.pause`, :func:`tractor.post_mortem` and
-     :func:`tractor.pause_from_sync` in the API reference.
-   - ``examples/debugging/`` — 20-odd runnable scripts, nearly
-     every one exercised by the test suite through a real pty.
-
-.. _structured concurrency:
-   https://en.wikipedia.org/wiki/Structured_concurrency
-.. _trio: https://github.com/python-trio/trio
-.. _cancellation: https://trio.readthedocs.io/en/latest/
-   reference-core.html#cancellation-and-timeouts
-.. _pdbp: https://github.com/mdmintz/pdbp
-.. _pdb++: https://github.com/pdbpp/pdbpp
-.. _greenback: https://github.com/oremanj/greenback
-.. _stackscope: https://github.com/oremanj/stackscope
-.. _PEP 553: https://peps.python.org/pep-0553/
-.. _#320: https://github.com/goodboy/tractor/issues/320

docs/guide/discovery.rst

@@ -1,255 +0,0 @@
-Actor discovery
-===============
-
-So you've spawned a tree of trio-"actors"; now their tasks need to
-*find* each other to start a dialog. ``tractor`` ships a (self
-admittedly) **very naive** discovery system which is nonetheless
-mighty handy for wiring up service-style apps: a built-in
-*registrar* actor plus a small set of lookup APIs that deliver
-a live, connected ``Portal`` to whichever peer you're after.
-
-.. d2:: diagrams/actor_tree.d2
-   :margin:
-   :caption: The root actor doubles as the *registrar* by
-       default; every spawned actor registers itself with it.
-   :alt: actor tree with root acting as registrar
-
-Because ``tractor`` is built on structured concurrency (SC), the
-discovery layer is *not* some external etcd/consul-shaped service
-you have to babysit; it's just another actor — normally the root
-of your tree — doing a bit of bookkeeping as part of the runtime.
-
-Every actor phones home
------------------------
-
-On runtime boot **every** actor self-registers with the registrar:
-it submits its unique ``(name, uuid)`` identity pair (aka its
-``uid``) mapped to the list of transport addresses its IPC server
-is bound to. On graceful teardown it likewise *un*-registers, so
-the registry tracks the live tree as it grows and shrinks.
-
-.. note::
-   Actor names are **not** enforced unique — the registry is keyed
-   by the full ``(name, uuid)`` pair. Name-based lookups simply
-   resolve to the *last* registered match, so if you boot five
-   actors all named ``'bob'``, you get the freshest ``'bob'`` B)
-
-First boot: who's the registrar?
---------------------------------
-
-By default the **root actor** *is* the registrar; subactors
-inherit the tree's ``registry_addrs`` at spawn time so the whole
-clan shares one registry with zero config on your part.
-
-The bootstrap rule inside ``open_root_actor()`` is delightfully
-simple:
-
-- on boot, ping every socket addr in ``registry_addrs``; when none
-  are passed the per-transport defaults are used: for TCP the
-  loopback ``('127.0.0.1', 1616)``, for UDS a
-  ``registry@1616.sock`` file,
-
-- if a registrar answers, you boot as a plain (non-registrar) root
-  actor and register with the *existing* registry; your own IPC
-  server binds random same-transport addrs instead,
-
-- if **nothing answers, congratulations: you just became the
-  registrar**. Your transport server binds the registry addrs
-  themselves and you start serving lookups for everyone else.
-
-Pass ``ensure_registry=True`` when your program *requires* being
-the one-and-only registrar; boot then fails loudly with a
-``RuntimeError`` if some other process already bound the registry
-socket(s).
-
-Looking up actors
------------------
-
-All lookup APIs are async context managers, so the SC rule you
-already know from the rest of ``tractor`` holds here too: any
-delivered portal (and its underlying IPC channel) is scoped to
-your ``async with`` block — no dangling connections.
-
-``find_actor()``
-****************
-
-The workhorse: ask the registrar for ``name`` and connect a portal
-to the match, or get ``None`` back when nobody's home:
-
-.. code:: python
-
-    async with tractor.find_actor('data_feed') as portal:
-        if portal is None:
-            ...  # not registered anywhere; maybe spawn it?
-        else:
-            await portal.run(do_stuff)
-
-Knobs worth knowing:
-
-- ``registry_addrs=[...]``: query specific (possibly multiple,
-  possibly remote) registrars instead of your tree's default,
-
-- ``only_first=False``: deliver a ``list[Portal]`` of *all*
-  matches found across the queried registrars instead of just the
-  first,
-
-- ``raise_on_none=True``: raise a ``RuntimeError`` instead of
-  yielding ``None`` when no match is found — for when absence is
-  a hard error in your app.
-
-``wait_for_actor()``
-********************
-
-Blocks until *someone* registers under ``name``, then yields a
-portal to that registree. Perfect for "wait for my sibling service
-to come up" sequencing:
-
-.. code:: python
-
-    async with tractor.wait_for_actor('service') as portal:
-        await portal.run(some_fn)
-
-``query_actor()``
-*****************
-
-A lookup *without* connecting to the target: yields an
-``(addr, reg_portal)`` pair where ``addr`` is the peer's preferred
-transport address, or ``None`` when nothing is registered under
-that name. Use it for liveness peeks or to log where a service
-lives without actually dialing it up.
-
-``get_registry()``
-******************
-
-Yields a portal straight to the registrar actor itself — or a
-``LocalPortal`` shim when the calling actor *is* the registrar
-(no IPC required to talk to yourself, hopefully).
-
-Fast paths and address preference
----------------------------------
-
-Before doing any RPC to the registrar, every lookup first scans
-the calling actor's *already-connected peers*: if you have a live
-channel to an actor named ``name`` you get a portal over it
-immediately, no registrar round-trip at all.
-
-When a registry entry holds *multiple* addresses (a multihomed
-actor) the "best" one is chosen by locality:
-
-1. UDS — same-host guaranteed, lowest overhead,
-
-2. local TCP — loopback or any of this host's own interface
-   addrs,
-
-3. remote TCP — the only option when actually distributed.
-
-Within a tier the most recently registered addr wins. Stale
-entries (an addr that no longer accepts connections) are detected
-on use and deleted from the registrar's table on your behalf.
-
-Demo: register and find a service
----------------------------------
-
-The simplest possible spin: start a subactor, ask the registrar
-where it lives, and wait on its registration:
-
-.. literalinclude:: ../../examples/service_discovery.py
-   :caption: examples/service_discovery.py
-   :language: python
-
-The daemon-service pattern
---------------------------
-
-The classic deployment shape: a long-lived daemon actor serves
-RPC, later-running code discovers it by name, calls in, and
-gracefully cancels it when the job is done:
-
-.. literalinclude:: ../../examples/service_daemon_discovery.py
-   :caption: examples/service_daemon_discovery.py
-   :language: python
-
-Note the teardown ordering — *graceful cancel* of the daemon via
-its portal is part of the pattern; under SC a "service" is still
-somebody's child and somebody is responsible for reaping it.
-
-Joining an existing tree from outside
--------------------------------------
-
-Discovery isn't limited to a single program: any standalone script
-can join a running tree by booting its *own* root actor pointed at
-the existing registrar:
-
-.. code:: python
-
-    import trio
-    import tractor
-
-    async def main():
-        async with (
-            # contact the live tree's registrar
-            tractor.open_root_actor(
-                registry_addrs=[('127.0.0.1', 1616)],
-            ),
-            tractor.find_actor('data_feed') as portal,
-        ):
-            ...  # RPC away like you were born here
-
-    trio.run(main)
-
-Per the bootstrap rules above, if the registrar at those addrs is
-*not* reachable this process simply becomes its own (registrar)
-root — so the same code works standalone and as a tree-joiner.
-
-"Arbiter"? A legacy naming note
--------------------------------
-
-In older releases (and many an old blog post or issue thread) the
-registrar actor was called the *arbiter*, with matching APIs like
-``get_arbiter()`` and an ``arbiter_addr`` argument. All of that
-terminology is retired: it's *registrar*/*registry* everywhere now
-(``registry_addrs``, ``get_registry()``, ...) and the
-``tractor.Arbiter`` export survives only as a back-compat alias of
-``tractor.Registrar``. If you see "arbiter" somewhere, mentally
-substitute "registrar" and you're up to date.
-
-.. note::
-   Multihoming nerds: ``tractor.discovery`` also ships
-   libp2p-style *multiaddr* helpers — ``mk_maddr()`` and
-   ``parse_maddr()`` — for describing transport endpoints as
-   structured strings.
-
-Very naive, very honest
------------------------
-
-To be clear, this is a **very naive** discovery system: one
-process-tree-local registrar holding a dict, no replication, no
-re-election when it dies, no cross-host propagation. That's
-intentional (for now); it covers the "wire up my services on this
-host" case without dragging in a consensus protocol.
-
-On the roadmap (issue `#216`_ tracks a chunk of it):
-
-- registrar high(er)-availability: staying up past tree teardown
-  and re-election,
-
-- a `gossip protocol`_ for decentralized cross-host discovery (the
-  zguide's `discovery`_ chapter is the spiritual reference),
-
-- `modern protocol`_ (rendezvous) style meet-up points.
-
-If any of that scratches your itch, the issue tracker would love
-to hear from you.
-
-.. seealso::
-   - :doc:`/guide/testing` — watching live actor trees (and their
-     registrar) while the test suite or your app runs.
-   - API refs: :func:`tractor.find_actor`,
-     :func:`tractor.wait_for_actor`,
-     :func:`tractor.query_actor`,
-     :func:`tractor.get_registry`,
-     :class:`tractor.Registrar`.
-
-.. _gossip protocol: https://en.wikipedia.org/wiki/Gossip_protocol
-.. _modern protocol: https://en.wikipedia.org/wiki/Rendezvous_protocol
-.. _discovery: https://zguide.zeromq.org/docs/chapter8/#Discovery
-.. _#216: https://github.com/goodboy/tractor/issues/216

docs/guide/index.rst

@@ -1,52 +0,0 @@
-Guides
-======
-Task-focused walkthroughs of every major ``tractor``
-subsystem, each built around real, *test-suite
-verified* example scripts from the repo's
-``examples/`` dir (we never copy-paste code into
-docs; what you read is what CI runs).
-
-Roughly in "first date to long term relationship"
-order,
-
-- :doc:`spawning` — actor nurseries, daemons +
-  one-shot workers, process lifetimes.
-- :doc:`rpc` — portals: calling into another
-  process like it's a local ``await``.
-- :doc:`context` — the cross-actor task-pair
-  primitive at the heart of modern ``tractor``.
-- :doc:`streaming` — one-way and bidirectional
-  msg streams between actors.
-- :doc:`cancellation` — supervision, error
-  boxing + propagation, teardown discipline.
-- :doc:`debugging` — the multi-process native
-  REPL debugger; our flagship DX feature B)
-- :doc:`discovery` — the registrar, finding
-  actors by name, service patterns.
-- :doc:`clustering` — quick flat process
-  clusters via one ``async with``.
-- :doc:`parallelism` — worker pools without
-  pools; a ``concurrent.futures`` re-think.
-- :doc:`asyncio` — "infected asyncio" mode:
-  SC-supervise ``asyncio`` tasks from ``trio``.
-- :doc:`msging` — typed IPC payloads, the wire
-  msg-spec and custom codecs.
-- :doc:`testing` — running + monitoring the
-  test suite (and testing your own actor apps).
-
-.. toctree::
-   :hidden:
-   :maxdepth: 1
-
-   spawning
-   rpc
-   context
-   streaming
-   cancellation
-   debugging
-   discovery
-   clustering
-   parallelism
-   asyncio
-   msging
-   testing

docs/guide/msging.rst

@@ -1,260 +0,0 @@
-Typed messaging
-===============
-Every value that crosses an actor boundary rides inside a typed
-msg. ``tractor`` ships a small, fixed family of msg types, the
-"SC-transitive supervision protocol", which encapsulates *all*
-RPC dialogs in the tree such that `structured concurrency`_ (SC)
-semantics -- parent-child task linkage, error propagation,
-graceful cancellation -- hold across every process hop. On top of
-that
-protocol you can layer **your own** payload type contracts,
-per-endpoint, and have them enforced at runtime by the codec.
-
-.. note::
-
-   Older posts and readmes claim ``tractor`` "uses
-   ``msgpack``(-python)" on the wire. The wire *encoding* is still
-   msgpack, but since ``0.1.0a5`` all codec work is done by
-   msgspec_ against a strictly-typed, tagged-union msg-spec;
-   neither ``msgpack-python`` nor ``u-msgpack`` are involved.
-
-The wire format
----------------
-Each protocol msg is a :class:`msgspec.Struct` subtype declared
-with ``tag=True, tag_field='msg_type'``, so the full set decodes
-as a `tagged union`__ with zero dispatch code of our own. The
-payload-carrying msgs all inherit from ``PayloadMsg`` which boxes:
-
-__ https://jcristharif.com/msgspec/structs.html#tagged-unions
-
-- ``.cid`` -- the "context id" identifying which dialog (i.e.
-  which ``Context``) the msg belongs to,
-- ``.pld`` -- the *payload*, aka your app's actual data.
-
-Decoding is deliberately two-layered:
-
-- the **transport codec** decodes only the protocol *envelope*,
-  intentionally leaving ``.pld`` as raw bytes
-  (:class:`msgspec.Raw`),
-- a **per-context payload-receiver** (the internal ``PldRx``) then
-  decodes each ``.pld`` against *that* dialog's user-defined type
-  spec.
-
-This split is what lets every ``Context`` carry its own msg-spec
-without reconfiguring the shared transport, keeps the runtime's
-own traffic immune to your app's spec choices, and makes any
-validation failure attributable to exactly one dialog (and thus
-one task pair) instead of nuking the whole channel.
-
-The protocol family
--------------------
-The entire msg-spec is ten types, all importable from
-``tractor.msg`` (defined in ``tractor.msg.types``):
-
-.. list-table::
-   :header-rows: 1
-   :widths: 18 82
-
-   * - msg type
-     - role
-   * - ``Aid``
-     - actor-identity handshake; the first thing two peers
-       exchange on connect (name, uuid, pid).
-   * - ``SpawnSpec``
-     - parent -> child runtime config sent right after ``Aid``:
-       enabled modules, registry/bind addrs, runtime vars.
-   * - ``Start``
-     - request to remotely schedule an RPC task: target
-       namespace + func name, kwargs and the caller's uid.
-   * - ``StartAck``
-     - the callee's ack declaring the endpoint's "functype":
-       ``asyncfunc``, ``asyncgen`` or ``context``.
-   * - ``Started``
-     - the first value passed to ``ctx.started()``; completes
-       the context handshake.
-   * - ``Yield``
-     - one streamed value per ``MsgStream.send()`` call.
-   * - ``Stop``
-     - graceful stream termination; the IPC rendition of
-       ``StopAsyncIteration``.
-   * - ``Return``
-     - the final return value of the remote task fn.
-   * - ``CancelAck``
-     - ``bool`` result of a runtime cancel-request; always
-       decodable so graceful cancellation can never be broken
-       by a custom msg-spec.
-   * - ``Error``
-     - a boxed remote exception (src uid, relay path, tb str,
-       ..) relayed for local re-raise as
-       :class:`tractor.RemoteActorError`.
-
-Squint and you'll see an SC task scope serialized onto the wire:
-every dialog opens with ``Start``/``StartAck`` (plus ``Started``
-for ``@tractor.context`` endpoints), optionally streams
-``Yield``-s until a ``Stop``, and **always** terminates with
-exactly one of ``Return``, ``Error`` or ``CancelAck``. That 1:1
-mapping of msg sequence onto a cross-process task pair is why we
-call the protocol *SC-transitive*: supervision semantics survive
-every hop of the tree. In `(un)protocol`_ terms it's our "SC
-dialog un-protocol".
-
-For introspection the union alias ``tractor.msg.MsgType``, the
-list ``__msg_types__`` and the spec alias ``__msg_spec__`` are
-all exported.
-
-Payload typing with ``pld_spec``
---------------------------------
-By default ``.pld`` may be any msgspec-supported type, i.e. the
-spec is ``Any``. To constrain a single endpoint's dialog, pass
-a type (union) to the decorator:
-``@tractor.context(pld_spec=MyStruct|None)``. The spec then
-applies to all payload-carrying msgs of that dialog --
-``Started``, ``Yield`` and ``Return`` -- on both sides of the
-IPC. Pro tip: keep ``None`` in your union since most endpoints
-implicitly ``return None`` and a bare ``ctx.started()`` ships
-``None`` too.
-
-.. literalinclude:: ../../examples/typed_payloads.py
-   :caption: examples/typed_payloads.py
-   :language: python
-
-What's going on?
-
-- the payload schema is just a :class:`msgspec.Struct` subtype;
-  anything msgspec can tag and decode works, including unions
-  of structs, builtins and containers.
-- decorating with ``@tractor.context(pld_spec=...)`` attaches the
-  spec to the endpoint; both peers' payload-receivers now decode
-  this dialog's payloads against it. No spec sharing files, no
-  IDL compiler, the contract *is* the Python type.
-- the happy path looks identical to untyped code: the child calls
-  ``await ctx.started(<conforming value>)``, streams or returns
-  more conforming values, and the parent receives fully decoded
-  struct instances (not dicts!) on its side.
-- the sad path is the point: shipping a value *outside* the spec
-  raises :class:`tractor.MsgTypeError`, which the example catches
-  to show off the failure mode; see the anatomy section below for
-  exactly where it gets raised.
-
-Where validation happens: cheap-or-nasty
-----------------------------------------
-A naive impl would validate every payload on both send *and*
-receive, doubling your codec bill exactly where throughput
-matters most. Instead ``tractor`` follows the 0mq lords'
-"`cheap or nasty`_" pattern: be **nasty** (strict, eager,
-expensive) on the rare control msgs and **cheap** (lazy, fast) on
-the high-rate stream path.
-
-- ``Started`` is the *only* payload that gets the full nasty
-  treatment: ``ctx.started(value)`` stringently
-  **roundtrip-checks** the encoded msg against the dialog's spec
-  *before* sending, so a non-conforming first value raises
-  :class:`tractor.MsgTypeError` immediately in the child and
-  never even hits the wire. (You can opt out per-call with
-  ``ctx.started(..., validate_pld_spec=False)`` if you measure
-  a real cost.)
-- ``Yield`` payloads are **never** checked inside
-  ``MsgStream.send()``; they're validated receiver-side on each
-  ``MsgStream.receive()``. A violation raises a ``MsgTypeError``
-  in the receiver *and* relays an ``Error`` msg back so the
-  offending sender gets one raised too.
-- the remaining control msgs (``Start``, ``Return``) are likewise
-  validated such that violations raise in the **sending** actor,
-  pointing the traceback at the code that actually goofed.
-
-Anatomy of a ``MsgTypeError``
------------------------------
-:class:`tractor.MsgTypeError` is the IPC equivalent of a builtin
-``TypeError``: a ``RemoteActorError`` subtype raised whenever
-a msg fails to decode against the active spec. The useful bits:
-
-- ``.bad_msg`` -- the offending msg instance (reconstructed from
-  its wire form when necessary) so you can inspect the actual
-  ``.pld`` that broke the contract.
-- ``.expected_msg_type`` -- the protocol msg type the bad msg was
-  (supposed to be) decoded as, e.g. ``Started[Point]``.
-- plus the standard ``RemoteActorError`` goodies: ``.boxed_type``,
-  ``.src_uid``, ``.ipc_msg`` and the fancy ``.pformat()`` tb-box
-  rendering.
-
-Practical reading guide: a *sender-side* MTE (``Started``,
-``Return``) points straight at your offending ``await
-ctx.started()`` or ``return`` statement, while a *receiver-side*
-MTE (``Yield``) surfaces from the consumer's ``receive()`` call
-with the relay copy delivered back to the producer. Either way
-the failure is scoped to that one dialog; sibling contexts on the
-same channel keep right on trucking.
-
-Custom wire types: ``mk_codec()`` and friends
----------------------------------------------
-msgspec covers a wide set of `builtin types`__ natively; for
-anything else you teach the codec via extension hooks. The
-easiest path is per-endpoint: ``@tractor.context()`` accepts
-``enc_hook``/``dec_hook`` params right alongside ``pld_spec``.
-For full control build and apply a codec yourself; encode-side:
-
-__ https://jcristharif.com/msgspec/supported-types.html
-
-.. code:: python
-
-    from tractor.msg import mk_codec, apply_codec
-
-    codec = mk_codec(
-        enc_hook=nsp_to_str,        # your-type -> wire-type
-        ext_types=[NamespacePath],
-    )
-    with apply_codec(codec):        # ContextVar-scoped override
-        ...  # msgs sent by this task now encode NSPs
-
-and decode-side, scoped to an open context (note the import from
-``tractor.msg._ops``, not yet re-exported):
-
-.. code:: python
-
-    from tractor.msg._ops import limit_plds
-
-    with limit_plds(
-        NamespacePath,
-        dec_hook=str_to_nsp,        # wire-type -> your-type
-        ext_types=[NamespacePath],
-    ):
-        ...  # this dialog's payloads decode as NSPs
-
-``apply_codec()`` is ``ContextVar``-scoped: it overrides the
-codec for the current task (and only that task), not the whole
-process. For complete working flows, including hook pairing rules
-and roundtrip cases, see ``tests/msg/test_ext_types_msgspec.py``
-and ``tests/msg/test_pldrx_limiting.py``.
-
-The runtime dogfoods this pattern with
-:class:`tractor.msg.NamespacePath`: a ``str``-subtype shaped like
-``'module.path:obj_name'`` used for every RPC target reference.
-It ships over the wire as a plain string yet ``.load_ref()``-s
-back to the actual object in the receiving actor's memory domain;
-a minimal "pointer type" for shared-nothing systems.
-
-Toward capability-based msging
-------------------------------
-The ``pld_spec`` + codec-hook layer is the foundation for the
-long-game: **capability-based msging** where each dialog's
-type contract doubles as a capability grant, negotiated as part
-of the protocol itself. That work is tracked in `#196`_ (with the
-original typed-proto epic in `#36`_); if strongly-typed
-distributed systems get you going, we'd love your input.
-
-Where to next?
---------------
-.. seealso::
-
-   - :doc:`/guide/context` for the dialog API these msgs
-     implement: ``started()``, streams and results.
-   - :doc:`/guide/asyncio` for shuttling (typed) payloads into
-     ``asyncio``-land via an infected subactor.
-   - the msgspec_ docs for everything your payload types can be.
-
-.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _msgspec: https://jcristharif.com/msgspec/
-.. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
-.. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
-.. _#196: https://github.com/goodboy/tractor/issues/196
-.. _#36: https://github.com/goodboy/tractor/issues/36

docs/guide/parallelism.rst

@@ -1,176 +0,0 @@
-Parallelism and worker pools
-============================
-
-The initial ask is almost always the same: *"how do i make a worker
-pool?"* — i.e. the thing :mod:`multiprocessing` and
-:class:`concurrent.futures.ProcessPoolExecutor` get reached for
-once the GIL becomes the enemy.
-
-Here's the structured concurrency (SC) answer: ``tractor`` is built
-to handle any SC process tree you can imagine; a "worker pool"
-pattern is a trivial special case. So instead of shipping a pool
-*class* with knobs bolted on, you compose one from the same two
-ingredients used everywhere else in ``tractor``: an actor nursery
-and some IPC.
-
-The stdlib baseline
--------------------
-
-For a fair comparison, start from the canonical
-:class:`~concurrent.futures.ProcessPoolExecutor` primes example
-straight out of the Python docs,
-
-.. literalinclude:: ../../examples/parallelism/concurrent_futures_primes.py
-   :caption: examples/parallelism/concurrent_futures_primes.py
-   :language: python
-
-Synchronous code, a hidden thread + IPC machine under the hood, and
-an API surface (executors, futures, ``.map()``) invented to paper
-over the fact that the pool isn't part of your program's task tree.
-Keep an eye on three things for the rewrite: how work is submitted,
-how results come back, and what happens when a worker dies.
-
-The ``tractor`` way
--------------------
-
-Now the same workload as a ``tractor`` program,
-
-.. literalinclude:: ../../examples/parallelism/concurrent_actors_primes.py
-   :caption: examples/parallelism/concurrent_actors_primes.py
-   :language: python
-
-What's different (and what isn't),
-
-- ``worker_pool()`` is ~30 lines of *your* code: an actor nursery
-  spawning ``workers`` subactors — each a full process running its
-  own ``trio`` task tree — kept alive and ready for work until the
-  block exits; ``enable_modules=[__name__]`` is the capability
-  allowlist letting them run this module's functions,
-- jobs are "submitted" by just... calling the function:
-  ``portal.run(is_prime, n=value)`` runs ``is_prime()`` in a
-  worker and hands back its result like any local ``await``,
-- results stream back through a plain
-  :func:`trio.open_memory_channel` *as they complete* — no futures
-  and no polling,
-- teardown is one ``await tn.cancel()``
-  (:meth:`tractor.ActorNursery.cancel`), and any worker crash
-  triggers the one-cancels-all machinery from
-  :doc:`/guide/cancellation` — a dead worker can never strand the
-  pool.
-
-This uses no extra threads, fancy semaphores or futures; all we
-need is ``tractor``'s IPC! The full scorecard,
-
-.. list-table::
-   :header-rows: 1
-   :widths: 50 50
-
-   * - ``concurrent.futures``
-     - ``tractor``
-   * - ``ProcessPoolExecutor()``
-     - ``worker_pool()`` — yours, ~30 lines
-   * - ``executor.map(is_prime, PRIMES)``
-     - ``actor_map(is_prime, PRIMES)`` async-gen
-   * - ``Future`` + internal result queue
-     - :func:`trio.open_memory_channel`
-   * - results in input order
-     - results as they complete
-   * - worker crash -> ``BrokenProcessPool``
-     - boxed :class:`tractor.RemoteActorError`
-   * - pool teardown on ``with`` exit
-     - one-cancels-all nursery teardown
-
-.. margin:: How many workers?
-
-   Same calculus as any process pool: about core-count for
-   CPU-bound work (the default sizing in
-   :doc:`/guide/clustering`); more only if workers block on I/O —
-   though at that point you likely want plain ``trio`` tasks, not
-   processes.
-
-And because the pool is just SC code, every variation — bounded
-submission, per-worker state, streaming partial results (see
-:doc:`/guide/streaming`), nested pools — is a local edit to your
-pool, not a feature request against an executor class B)
-
-An *async* pool, though?
-************************
-
-Yep: RPC targets must be async functions — the runtime rejects a
-plain ``def`` with ``TypeError: ... must be an async function!``.
-That's not zealotry, it's cancel-responsiveness: each worker is a
-full ``trio`` runtime whose msg loop is what hears graceful cancel
-requests, and a hot loop that never yields can't be (politely)
-interrupted.
-
-Two practical consequences,
-
-- CPU-bound loops should checkpoint once in a while; note how
-  ``burn_cpu()`` in the next example sprinkles ``await
-  trio.sleep()`` calls so the worker stays responsive while still
-  pegging a core,
-- if some sync call blocks a worker anyway you're still covered:
-  an unresponsive actor just rides the graceful-then-hard teardown
-  ladder from :doc:`/guide/cancellation` instead of acking its
-  cancel — slower, but never a zombie.
-
-Run a func in a process
------------------------
-
-Even a pool can be overkill; "run this one async func in a
-subprocess and give me the result" is a one-liner via
-:meth:`tractor.ActorNursery.run_in_actor`,
-
-.. literalinclude:: ../../examples/parallelism/single_func.py
-   :caption: examples/parallelism/single_func.py
-   :language: python
-
-``run_in_actor()`` is a *convenience wrapper* — spawn an actor, run
-exactly one task in it, reap on result — not the core spawning
-model (that's :meth:`tractor.ActorNursery.start_actor` plus
-:meth:`tractor.Portal.open_context`; see :doc:`/guide/context`).
-But for this fire-and-collect shape it's exactly the right amount
-of typing.
-
-As the module docstring suggests, run it under a process-tree
-monitor to watch the child appear and get reaped,
-
-.. code:: bash
-
-    $TERM -e watch -n 0.1  "pstree -a $$" \
-        & python examples/parallelism/single_func.py \
-        && kill $!
-
-You'll see a core get burned in both parent and child — real
-parallelism, no GIL sharing, since these are processes (i.e.
-*non-shared-memory threads*).
-
-When all you have is sync code
-------------------------------
-
-Honesty corner: if your workload is purely *synchronous* functions
-and you've zero need for IPC dialogs, streaming, daemons or
-supervision trees — i.e. you really do just want
-"``ProcessPoolExecutor`` but ``trio``-native" — the smaller,
-focused `trio-parallel`_ project may serve you better. ``tractor``
-happily covers the use case (as above) but brings a whole runtime
-along for the ride. (And when blocking I/O — not the GIL — is the
-actual problem, plain in-process :func:`trio.to_thread.run_sync`
-may be all you ever needed.)
-
-And to *see* that runtime's process-management story — a per-core
-fleet self-destructing with zero zombies left behind — go run
-``examples/parallelism/we_are_processes.py``, walked through in
-the :doc:`/start/quickstart`.
-
-.. seealso::
-
-   - :doc:`/guide/clustering` — the one-liner flat-cluster
-     convenience (``open_actor_cluster()``) for when even a
-     hand-rolled pool is too much typing,
-   - :doc:`/guide/cancellation` — why pool teardown is bulletproof
-     (graceful-then-hard escalation, no zombies),
-   - :doc:`/guide/context` — the core per-task API your pool
-     workers can graduate to.
-
-.. _trio-parallel: https://github.com/richardsheridan/trio-parallel

docs/guide/rpc.rst

@@ -1,177 +0,0 @@
-RPC: calling into other actors
-==============================
-Every spawn call from :doc:`/guide/spawning` hands you back
-a :class:`~tractor.Portal`: a live handle for calling into
-another actor's **memory domain**. The name is borrowed from
-``trio``'s portal concept — an object you use to submit work
-*into* a separate concurrency domain — except here that domain
-is a whole other process.
-
-.. d2:: diagrams/runtime_stack.d2
-   :margin:
-   :caption: The layers a ``portal.run()`` request rides through.
-   :alt: app, tractor runtime, IPC channel and OS process layers
-
-There are **no proxy objects** and no special calling
-conventions: you pass a plain function reference plus keyword
-args, and Python's normal ``await``-able semantics apply. The
-function just happens to *run somewhere else*; from the calling
-task it looks as though it was called locally. And since this is
-all structured concurrency (SC) under the hood, the remote task
-runs inside the callee's supervised task tree while its result
-— or its failure, as a boxed
-:exc:`~tractor.RemoteActorError` — always comes back to *you*.
-
-``Portal.run()``: pass the function, not a string
--------------------------------------------------
-:meth:`~tractor.Portal.run` schedules an async function as
-a **new task** in the remote actor and waits on its result:
-
-.. code:: python
-
-    async with tractor.open_nursery() as an:
-        portal = await an.start_actor(
-            'service',
-            enable_modules=[__name__],
-        )
-        answer = await portal.run(movie_theatre_question)
-
-The rules of engagement:
-
-- the target must be an **async function** and its defining
-  module must be in the callee's ``enable_modules`` allowlist,
-  else an :exc:`~tractor.ModuleNotExposed` error is relayed
-  back (see :doc:`/guide/spawning` for the capability-allowlist
-  story).
-- arguments are passed **by keyword only**; they ride the IPC
-  layer as msgspec_-encoded msgs, so keep them serializable.
-- every call schedules a *fresh* task remotely — call it twice
-  and the callee runs two tasks, each supervised in its own
-  right.
-- remote exceptions re-raise locally as
-  :exc:`~tractor.RemoteActorError` with the original type
-  preserved via ``.boxed_type``.
-
-.. note::
-
-   Passing dotted-path *strings* to ``run()`` is an ancient,
-   deprecated form; always pass the function reference. If you
-   really need name-based addressing use ``run_from_ns()``
-   below.
-
-Namespaced daemons: ``run_from_ns()``
--------------------------------------
-Sometimes the calling process can't (or shouldn't) import the
-target function — think a long-running rpc-daemon serving
-modules your client never loads. For that,
-:meth:`~tractor.Portal.run_from_ns` takes the explicit
-namespace path:
-
-.. code:: python
-
-    await portal.run_from_ns('mypkg.service', 'ping')
-
-This is literally how ``.run()`` works underneath: the pair is
-encoded as a ``'mod.path:func'`` style msg and resolved against
-the callee's enabled modules.
-
-One special namespace exists: ``'self'`` resolves to the remote
-:class:`~tractor.Actor` instance, i.e. the runtime itself. It's
-how internal machinery (cancel requests, registry ops) travels;
-don't build your app on it.
-
-One-shot results: ``wait_for_result()``
----------------------------------------
-A portal returned from
-:meth:`~tractor.ActorNursery.run_in_actor` has exactly one
-"main" task running remotely; that task's ``return`` value is
-delivered as the portal's *final result*:
-
-.. code:: python
-
-    portal = await an.run_in_actor(fib, n=10)
-    final = await portal.wait_for_result()
-
-Semantics worth knowing:
-
-- it blocks until the remote task returns, re-raising any
-  remote error in the usual boxed form.
-- once resolved it's idempotent: later calls return the same
-  cached value.
-- a *daemon* portal (from ``start_actor()``) has no main task,
-  so there's no final result to wait for: you'll get a warning
-  plus a ``NoResult`` sentinel. Results of individual daemon
-  calls come straight back from each ``await portal.run()``.
-
-Pure RPC daemons: ``run_daemon()``
-----------------------------------
-When a process's *only* job is to sit at the root of its own
-tree and serve RPC, skip the boilerplate with
-:func:`tractor.run_daemon`:
-
-.. code:: python
-
-    import tractor
-
-    tractor.run_daemon(
-        ['mypkg.service'],
-        name='service',
-    )
-
-It's a blocking convenience (it calls ``trio.run()`` for you):
-boot a root actor with the given modules enabled for RPC, then
-sleep until cancelled. Pair it with the discovery system —
-:func:`tractor.find_actor` / :func:`tractor.wait_for_actor`
-from a *separate* program — and you've got a tiny service
-architecture with zero framework ceremony; see
-``examples/service_daemon_discovery.py`` for the full pattern.
-
-Fan-out: RPC through nested trees
----------------------------------
-Portals compose. An RPC task is just a ``trio`` task, so it can
-open its own :class:`~tractor.ActorNursery` and portal into
-*its* children — one inbound call fanning out into a whole
-sub-tree of work. The mid-tier function from the nested-tree
-example:
-
-.. literalinclude:: ../../examples/nested_actor_tree.py
-   :caption: examples/nested_actor_tree.py (supervisor fan-out)
-   :language: python
-   :pyobject: fan_out_squares
-
-The root portals into the ``supervisor`` actor; the
-supervisor's RPC task spawns the leaf workers, portals into
-each, and returns the combined result back up. Failures at any
-depth relay hop-by-hop as boxed errors, and cancelling the root
-call tears down the entire sub-tree — SC, transitively.
-
-When to graduate to ``Context``
--------------------------------
-``portal.run()`` is great for one-shot, request-response calls.
-Reach for :meth:`~tractor.Portal.open_context` with an
-``@tractor.context`` endpoint as soon as you want:
-
-- a long-lived dialog with state held on both sides,
-- bidirectional streaming via ``ctx.open_stream()``,
-- typed payload contracts (``pld_spec``) enforced at the msg
-  layer,
-- or *task-scoped* cancellation: ``Context.cancel()`` cancels
-  just the linked remote task, whereas
-  :meth:`~tractor.Portal.cancel_actor` nukes the **entire**
-  remote runtime and its process.
-
-In fact the source plans for ``Portal.run()`` itself to be
-rebuilt on top of ``open_context()`` — contexts *are* the core
-inter-actor protocol. Take the full tour in
-:doc:`/guide/context`.
-
-.. seealso::
-
-   - :doc:`/guide/spawning` — where portals come from and how
-     their actors are supervised.
-   - :doc:`/guide/context` — the structured cross-actor task
-     API: handshake, streaming, typed payloads.
-   - :doc:`/guide/cancellation` — what happens to in-flight RPC
-     when trees get torn down.
-
-.. _msgspec: https://jcristharif.com/msgspec/

docs/guide/spawning.rst

@@ -1,299 +0,0 @@
-Spawning actors
-===============
-If you know trio_ you know the drill: you don't get to launch
-a task off into the void, you open a nursery_, the nursery owns
-the task, and the block can't exit until every child is done.
-That discipline is `structured concurrency`_ (SC) — see the
-seminal `blog post`_ if you haven't yet — and it's the whole
-religion around here.
-
-``tractor`` applies that exact discipline to **processes**: an
-:class:`~tractor.ActorNursery` is a *process nursery*. Every
-"task" it starts is a fresh Python process running its own
-``trio.run()``-scheduled task tree; we call each one a
-``trio``-"*actor*". Parents must wait on (and clean up after)
-their children, transitively, all the way down the tree.
-
-.. d2:: diagrams/actor_tree.d2
-   :caption: A process tree of ``trio``-task-trees.
-   :alt: a nested actor tree where every parent supervises its children
-
-Though a "process nursery" differs in complexity (and slightly
-in semantics) from a single-threaded task nursery, most of the
-interface is the same. The main difference is that each spawned
-child contains a full, *parallel-executing* ``trio`` task tree.
-The following super powers ensue:
-
-- tasks started in a child actor are completely independent of
-  tasks started in the current process; they execute in
-  **parallel** and are scheduled by their own actor's ``trio``
-  run loop.
-- tasks scheduled in a remote process still maintain an SC
-  protocol *across memory boundaries* using a so called
-  "SC dialogue protocol" which keeps task-hierarchy lifetimes
-  linked across the IPC layer.
-- a remote task can fail and have that failure relayed back to
-  the caller task (living in some other actor) as a serialized
-  :exc:`~tractor.RemoteActorError`; no spawned process or RPC
-  task can ever just go off on its own.
-
-Opening a (process) nursery
----------------------------
-:func:`tractor.open_nursery` is the entrypoint:
-
-.. code:: python
-
-    async def main():
-        async with tractor.open_nursery() as an:
-            ...  # spawn some actors B)
-
-    trio.run(main)
-
-Notice there's no runtime-boot ceremony: if no actor runtime is
-up yet (i.e. you're in a plain old Python process),
-``open_nursery()`` *implicitly* enters
-:func:`tractor.open_root_actor` for you, making this process the
-**root actor** of a new tree. Any extra keyword args you pass
-are proxied straight through to ``open_root_actor()``, so the
-runtime config lives wherever you open your first nursery:
-
-.. code:: python
-
-    async with tractor.open_nursery(
-        loglevel='info',
-        debug_mode=True,  # crash-to-REPL for the whole tree
-    ) as an:
-        ...
-
-If you want the runtime up *without* spawning anything (or you
-prefer the config to be loudly explicit) enter
-``open_root_actor()`` yourself first; the nursery will detect
-the running runtime and skip the implicit boot. Either way,
-nesting a second root inside an existing tree is an error.
-
-Inside a *subactor* the same call just works: any actor may open
-nurseries of its own, which is how you get arbitrarily deep
-trees (more on that below).
-
-``start_actor()``: daemons that live until cancelled
-----------------------------------------------------
-:meth:`~tractor.ActorNursery.start_actor` is **the** core
-spawning primitive. It starts a *daemon* actor: a process with
-no designated "main task" besides the runtime itself. It boots,
-registers with its parent, and then sits there serving RPC
-requests until somebody cancels it. You get back a
-:class:`~tractor.Portal` for doing exactly that kind of
-somebody-ing:
-
-.. literalinclude:: ../../examples/actor_spawning_and_causality_with_daemon.py
-   :caption: examples/actor_spawning_and_causality_with_daemon.py
-   :language: python
-
-What's going on here?
-
-- ``start_actor('frank', enable_modules=[__name__])`` forks off
-  a new process, boots a ``tractor`` runtime inside it, and
-  allows it to serve functions from the current module (see the
-  allowlist section below).
-- each ``await portal.run(...)`` schedules a *new* task in
-  frank's task tree and waits on its result — the full RPC story
-  lives in :doc:`/guide/rpc`.
-- frank has no main task to complete, so without the final
-  ``await portal.cancel_actor()`` the nursery block would wait
-  on him **forever**. Daemon lifetimes are *yours* to end; that
-  explicitness is the point.
-
-``run_in_actor()``: quick one-shot parallelism
-----------------------------------------------
-:meth:`~tractor.ActorNursery.run_in_actor` is the convenience
-wrapper: spawn an actor, run exactly one async function in it,
-then reap the process as soon as the result arrives.
-
-.. code:: python
-
-    async with tractor.open_nursery() as an:
-        portal = await an.run_in_actor(burn_cpu)
-        # burn rubber in the parent too...
-        await burn_cpu()
-        total = await portal.wait_for_result()
-
-A few details worth knowing:
-
-- the actor is named after the function unless you pass
-  ``name='something_cuter'``.
-- the function's module is auto-added to the child's
-  ``enable_modules`` allowlist.
-- extra ``**kwargs`` are forwarded to the function itself.
-- the child is *auto-cancelled* once its "main" result lands;
-  at nursery exit these run-once children are always reaped
-  first (causality_ is paramount!).
-
-.. note::
-
-   ``run_in_actor()`` is a convenience, **not** the core model.
-   The source literally marks it for an eventual rebuild as
-   a thin "hilevel" wrapper on top of
-   :meth:`~tractor.Portal.open_context` (the modern inter-actor
-   task API). Teach your fingers to use it for quick
-   fire-and-collect parallelism — think a per-function
-   trio-parallel_ style one-shot — and reach for
-   ``start_actor()`` + ``open_context()`` for anything
-   long-lived, stateful or streaming
-   (:doc:`/guide/context`).
-
-Actor lifetimes and teardown order
-----------------------------------
-So we have two lifetime flavors:
-
-- **run-once** (``run_in_actor()``): lives exactly as long as
-  its single task; reaped the moment its result (or error)
-  arrives.
-- **daemon** (``start_actor()``): lives until *someone* cancels
-  it — an explicit ``await portal.cancel_actor()``, a bulk
-  ``await an.cancel()``, or the one-cancels-all strategy kicking
-  in on error.
-
-On a clean exit of the nursery block the teardown order is:
-
-1. the nursery waits on every run-once actor's final result;
-   any errors from these are raised immediately so your code
-   (acting as supervisor) gets first crack at handling them.
-2. then it waits on daemon actors — **indefinitely**. If you
-   spawned a daemon, you own its lifetime.
-
-When a child *is* cancelled, teardown is graceful-first per SC
-discipline: the runtime sends an IPC cancel request and gives
-the child a bounded window to ack; only when a child is too
-slow does the nursery escalate to an OS-level hard kill of the
-process. There is no path where a child is silently left
-running:
-
-    ``tractor`` tries to protect you from zombies, no matter
-    what. If you can create zombie child processes (without
-    using a system signal) it **is a bug**.
-
-Per-process cleanup hooks
-*************************
-Need something torn down when an actor's runtime exits, no
-matter how it exits? Every actor carries
-a process-global :class:`contextlib.ExitStack` at
-``Actor.lifetime_stack`` which is closed at the very end of
-runtime teardown:
-
-.. code:: python
-
-    db = await connect_db()
-    tractor.current_actor().lifetime_stack.callback(db.close)
-
-(A so-far under-advertised api — expect it to get more love.)
-
-When things blow up: one-cancels-all
-------------------------------------
-The default (and currently only) supervision strategy is the
-same one ``trio`` nurseries use: **one-cancels-all**. If your
-nursery-block body errors, every child actor is cancelled. If
-a child errors, the failure is relayed to the nursery as a
-boxed :exc:`~tractor.RemoteActorError` (original type preserved
-via ``.boxed_type``), all *other* children are cancelled, and
-the error(s) re-raise locally — exactly like ``trio``, just
-process-wide. Erlang-style alternative strategies are a long
-standing roadmap item.
-
-The full story — how cancel requests relay across the tree, who
-``.canceller`` was, debugging mid-teardown — lives in
-:doc:`/guide/cancellation`.
-
-The module allowlist: ``enable_modules``
-----------------------------------------
-A subactor will only serve functions from modules its parent
-*explicitly* enabled at spawn time:
-
-.. code:: python
-
-    portal = await an.start_actor(
-        'service',
-        enable_modules=['mypkg.service'],  # or [__name__]
-    )
-
-At child boot the runtime imports each listed module so inbound
-RPC requests can resolve function references against it. Ask
-a peer to run something from any *other* module and you get an
-:exc:`~tractor.ModuleNotExposed` error relayed back — the child
-never even looks the function up.
-
-Think of it as the first, deliberately coarse layer of
-capability-style permissioning: if you don't hand an actor
-a module, no peer can invoke anything inside it. (Finer-grained
-capability-based messaging protocols are on the roadmap.)
-
-The ``enable_modules=[__name__]`` idiom — "let the child run
-functions from the *current* module" — is what you'll use in
-most scripts; bigger apps tend to pass dedicated service-module
-paths instead.
-
-Per-child knobs
----------------
-Both spawn methods accept per-child config so one weird child
-doesn't have to drag the whole tree along:
-
-- ``loglevel='cancel'`` — crank console logging for just this
-  subactor (the ``TRACTOR_LOGLEVEL`` env var overrides whatever
-  the *root* was passed, handy for test runs).
-- ``debug_mode=True`` — arm the crash-handling REPL machinery
-  for just this child instead of tree-wide, i.e. the selective
-  flavor of ``open_nursery(debug_mode=True)``; see
-  :doc:`/guide/debugging` for the multi-process debugger tour.
-- ``infect_asyncio=True`` — run the child with ``trio`` as an
-  ``asyncio`` guest, aka "infected asyncio" mode.
-- ``enable_transports=['uds']`` — pick the IPC transport this
-  child should listen on (default ``'tcp'``).
-
-Trees all the way down
-----------------------
-Since any actor can open an ``ActorNursery``, supervision trees
-compose to arbitrary depth: a subactor can be a supervisor of
-*its own* subactors, with every level holding the same SC
-guarantees — error relay up, cancellation down, no orphans.
-
-.. literalinclude:: ../../examples/nested_actor_tree.py
-   :caption: examples/nested_actor_tree.py
-   :language: python
-
-Here the root spawns a ``supervisor`` actor whose RPC task opens
-its *own* nursery and spawns the leaf workers; one call from the
-root fans out through the middle layer and the aggregate comes
-back up. Teardown ripples in reverse: the leaves are reaped when
-the supervisor's nursery exits, the supervisor when the root
-cancels it.
-
-Watching your tree grow
------------------------
-Actors are real processes, so your favorite system tools just
-work. The house incantation runs any example beside a live
-process-tree monitor::
-
-    $TERM -e watch -n 0.1 "pstree -a $$" \
-        & python examples/nested_actor_tree.py \
-        && kill $!
-
-Every subactor also sets its OS process title to a stable
-``_subactor[<name>@<uuid-prefix>]`` marker, so ``htop``,
-``ps`` and friends show *which actor is which* at a glance::
-
-    pgrep -af '_subactor\['
-
-.. seealso::
-
-   - :doc:`/guide/rpc` — actually invoking functions through
-     all these portals you've been collecting.
-   - :doc:`/guide/context` — the structured, streaming-capable
-     inter-actor task API.
-   - :doc:`/guide/cancellation` — cross-actor cancellation and
-     error propagation semantics in depth.
-
-.. _trio: https://github.com/python-trio/trio
-.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning
-.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
-.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
-.. _trio-parallel: https://github.com/richardsheridan/trio-parallel

docs/guide/streaming.rst

@@ -1,244 +0,0 @@
-Cross-process streaming
-=======================
-
-Spawning processes is the boring half of ``tractor``: the **real
-cool stuff** is the native support for cross-process *streaming*.
-Yes, you saw it here first — 2-way msg streams with reliable,
-transitive setup/teardown semantics, wired straight into the
-runtime's `structured concurrency`_ (SC) supervision machinery so
-that *how* a stream ends is part of the protocol.
-
-No broker, no topic exchange, no IDL compiler. The IPC layer is a
-deliberately "`cheap or nasty`_" `(un)protocol`_: a tiny set of
-msgspec_-typed msgs over a transport (TCP or UDS today) with
-payload typing opt-in per dialog — handshake msgs get the *nasty*
-treatment (strict validation) while high-rate stream payloads
-stay *cheap* (receiver-side checks only). See
-:doc:`/guide/context` for the typed ``pld_spec`` contract bits.
-
-Two ways to stream
-------------------
-
-.. margin:: It's a ``trio.abc.Channel``
-
-   :class:`tractor.MsgStream` implements
-   :class:`trio.abc.Channel` — ``send()``,
-   ``receive()``, async-iteration, ``aclose()`` —
-   so trio-generic channel code drives an IPC
-   stream unchanged.
-
-- **Bidirectional, context-based**: open a
-  :class:`tractor.Context` to a peer task then enter
-  ``ctx.open_stream()`` for a full-duplex
-  :class:`tractor.MsgStream`. This is the modern core API, taught
-  end-to-end in :doc:`/guide/context`; we won't re-teach it here.
-
-- **One-way, portal-based**: point
-  :meth:`tractor.Portal.open_stream_from` at a plain async
-  generator fn in the peer actor. Legacy, but perfectly fine for
-  simple produce/consume pipelines — and it powers the classic
-  examples below.
-
-Rule of thumb: if the consumer ever needs to *talk back* — acks,
-control msgs, a final result — use a context. If it's a pure
-pipeline stage, either works and the one-way form is less typing.
-
-One-way streaming from an async generator
------------------------------------------
-
-The OG api. Write an async generator in the target actor's
-module; iterate its yields from the spawning side:
-
-.. literalinclude:: ../../examples/asynchronous_generators.py
-   :caption: examples/asynchronous_generators.py
-   :language: python
-
-Each ``yield`` crosses the process boundary as one msg and feeds
-the parent's ``async for``. When the consumer ``break``\ s out
-and exits the ``open_stream_from()`` block the far-end generator
-task is cancelled for you: the producer's lifetime is *coupled to
-the consumer's scope* so a one-way stream can never leak a remote
-task.
-
-Any extra kwargs (``stream_data, seed=100`` style) are forwarded
-to the remote generator's call, and a non-async-gen target is
-rejected up front with a ``TypeError``.
-
-.. note::
-
-   No decorator required — any plain async-gen fn works. You may
-   still meet ``@tractor.stream`` in the wild; it's the legacy
-   marker for one-way endpoints and sticks around only for
-   compat (heads up: the param name ``ctx`` is reserved for
-   ``@context`` endpoints nowadays, so legacy fns should call
-   theirs ``stream``). New code wanting anything fancier than a
-   one-way pipe should use :func:`tractor.context` +
-   ``ctx.open_stream()``.
-
-.. warning::
-
-   One-way means one way: there's no sending *to* the generator
-   side and no graceful consumer-to-producer stop msg — the
-   teardown above is cancel-based. Needing upstream control flow
-   is the sign you've outgrown this API.
-
-A full-fledged streaming service
---------------------------------
-
-Now let's get fancy: compose one-way streams through a nested
-actor tree and you've got yourself a fan-in pipeline.
-
-.. d2:: diagrams/streaming_pipeline.d2
-   :caption: Four actors, three streams, one deduped feed.
-   :alt: two streamer actors fan in to an aggregator then root
-
-.. literalinclude:: ../../examples/full_fledged_streaming_service.py
-   :caption: examples/full_fledged_streaming_service.py
-   :language: python
-
-What's going on?
-
-- the root actor spawns ``'aggregator'`` which opens its *own*
-  actor nursery and spawns ``'streamer_1'`` + ``'streamer_2'``: 4
-  processes total, supervision nested two levels deep with zero
-  special casing.
-
-- ``aggregate()`` opens a one-way stream from each streamer and
-  fans both into a single :func:`trio.open_memory_channel` via
-  one local trio task per portal — in-actor fan-in riding trio's
-  built-in backpressure end-to-end.
-
-- duplicates get dropped via a ``set`` and the deduped sequence
-  is *re-yielded* upward: ``aggregate()`` is itself an async gen
-  being consumed over IPC by the root. Streams compose.
-
-- when the seed runs out the streamer gens finish, the memory
-  channel drains closed, the aggregator's gen returns and the
-  root's ``async for`` ends; ``await an.cancel()`` then reaps the
-  subtree. Every exit is awaited — if you can produce a zombie
-  process from this, it **is a bug**.
-
-Watch the tree breathe while it runs, using the README's
-signature process-monitor incantation::
-
-    $TERM -e watch -n 0.1  "pstree -a $$" \
-        & python examples/full_fledged_streaming_service.py \
-        && kill $!
-
-No extra threads, no fancy semaphores, no futures; all we need is
-``tractor``'s IPC.
-
-Two streams, one portal
------------------------
-
-Every ``open_stream_from()`` call starts its *own* remote task —
-even through the same portal — so two local consumer tasks can
-independently stream the same generator fn concurrently, both
-dialogs multiplexed over the single underlying IPC channel:
-
-.. literalinclude:: ../../examples/multiple_streams_one_portal.py
-   :caption: examples/multiple_streams_one_portal.py
-   :language: python
-
-The add-else-remove trick on the shared ``consumed`` list is the
-proof: each value arrives in *both* streams, getting appended by
-whichever task sees it first and removed by the other, so the
-list always ends up empty. Two streams, same data, zero
-interference.
-
-This works because every dialog is keyed by its own context id
-(``Context.cid``) — any number of concurrent streams, contexts
-and one-shot RPCs share a single underlying
-:class:`tractor.Channel` per peer pair.
-
-Fan-out inside an actor: ``MsgStream.subscribe()``
---------------------------------------------------
-
-The inverse pattern: *one* IPC stream feeding *many* local tasks.
-Instead of paying for N redundant cross-process streams, call
-:meth:`tractor.MsgStream.subscribe` to get a
-``BroadcastReceiver`` — a tokio-style broadcast channel from
-``tractor.trionics`` — which copies every received value to each
-subscribed task:
-
-.. literalinclude:: ../../examples/streaming_broadcast_fanout.py
-   :caption: examples/streaming_broadcast_fanout.py
-   :language: python
-
-Each task entering ``stream.subscribe()`` receives its own copy
-of everything sent from that point on. The underlying stream
-keeps pace with the *fastest* subscriber; a task falling more
-than the buffered window behind has its next receive raise
-``tractor.trionics.Lagged`` to say it lost data.
-
-The broadcast handle stays duplex btw: it proxies ``send()``
-through to the underlying stream, so each subscriber task can
-keep talking upstream while consuming its fan-out copy.
-
-.. warning::
-
-   ``.subscribe()`` is **idempotent and non-reversible**: the
-   first call permanently swaps the stream's receive machinery
-   over to the internally allocated broadcaster. There's no
-   un-subscribing back to the raw stream, so make sure you're ok
-   with the (theoretical) overhead before opting in.
-
-Consuming: ``async for`` and friends
-------------------------------------
-
-``async for msg in stream:`` is just sugar over repeated
-``await stream.receive()``. The receive-side surface:
-
-- ``receive()`` — next msg, or raises :exc:`trio.EndOfChannel`
-  on a graceful far-end close (``async for`` translates that
-  into a clean loop exit for you).
-
-- ``receive_nowait()`` — opportunistic, non-blocking drain.
-
-- ``closed`` — property flagging an already-ended stream.
-
-Send-side it's just ``await stream.send(data)`` — one ``Yield``
-msg per call carrying any msgspec_-encodable payload (or
-whatever your ``pld_spec`` permits, see :doc:`/guide/context`).
-
-End-of-stream: close vs. cancel
--------------------------------
-
-How a stream ends is part of the protocol; the runtime keeps the
-polite case and the violent case distinct:
-
-- **graceful close**: the far side exits its stream block, its
-  async gen returns, or it calls ``await stream.aclose()``. A
-  ``Stop`` msg is sent so your ``async for`` simply ends
-  (``StopAsyncIteration``, via :exc:`trio.EndOfChannel` under the
-  hood). A normal, non-error ending — the dialog's result phase
-  proceeds as usual.
-
-- **cancel or error**: no ``Stop`` is sent. Instead the
-  cancel/error itself is relayed so the far end *knows* the
-  dialog did not end on purpose and raises accordingly — a
-  :exc:`tractor.ContextCancelled`, a boxed
-  :exc:`tractor.RemoteActorError`, etc. See the cancellation
-  section of :doc:`/guide/context` for exactly who raises what.
-
-Tying it together: every ``MsgStream`` is **one-shot use**. Both
-endings are final — once closed a stream can't be re-opened and
-the supported "retry" is opening a fresh :class:`tractor.Context`
-(they're cheap).
-
-.. seealso::
-
-   - :doc:`/guide/context` — the full ``Context`` lifecycle: the
-     handshake, results, cancellation semantics and the
-     overrun/backpressure knobs.
-
-   - :class:`tractor.MsgStream` and
-     :meth:`tractor.Portal.open_stream_from` API docs.
-
-   - The zguide chapters our wire philosophy is named after:
-     "`cheap or nasty`_" and `(un)protocol`_\ s.
-
-.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
-.. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
-.. _msgspec: https://jcristharif.com/msgspec/

docs/guide/testing.rst

@@ -1,256 +0,0 @@
-Testing tips
-============
-
-``tractor``'s test suite is a different kind of beast than your
-average single-proc pytest run: nearly every test spawns a real
-**process tree**, hammers on cancellation under structured
-concurrency (SC), and tears the whole thing down again — hundreds
-of times per session. This page collects the tips, knobs and
-one-liners that make hacking on (and with) the suite pleasant.
-
-Running the suite
------------------
-
-This is a uv_-managed project, so after cloning it's just::
-
-    uv sync --dev
-    uv run pytest tests/
-
-Expect a *lot* of process churn; the suite is effectively a
-rolling chaos exercise for the runtime.
-
-The classic fix-iterate loop when something breaks::
-
-    # stop at the first failure
-    uv run pytest tests/ -x
-
-    # then iterate on just the failures til green
-    uv run pytest --lf -x
-
-``--lf`` (last-failed) re-runs only what failed previously, so
-combined with ``-x`` you get a tight one-test-at-a-time repair
-loop.
-
-Suite-specific flags
-********************
-
-The repo auto-loads the bundled ``tractor._testing.pytest`` plugin
-(via ``addopts`` in ``pyproject.toml``) which adds a few extra
-flags:
-
-- ``--spawn-backend <key>``: pick the process spawn backend for
-  the session (default ``'trio'``); same keys as the
-  ``start_method`` runtime argument,
-
-- ``--tpt-proto <key> [...]``: which IPC transport(s) opting-in
-  suites should run against, eg. ``--tpt-proto uds``,
-
-- ``--tpdb`` / ``--debug-mode``: flip on the ``debug_mode``
-  fixture so debugger-aware tests boot their trees with the
-  crash-REPL enabled,
-
-- ``--enable-stackscope``: install the ``SIGUSR1`` task-tree dump
-  handler in pytest *and* every spawned subactor — much lighter
-  than a full debug-mode run when you only need stack visibility
-  during a hang hunt,
-
-- ``--ll <level>`` / ``--tl <level-or-spec>``: console loglevels;
-  ``--tl`` targets the ``tractor``-as-runtime logger and accepts
-  a per-subsystem spec like ``'devx:runtime,trionics:cancel'``.
-
-Watch the tree grow
--------------------
-
-The single most useful trick while the suite (or any ``tractor``
-app) runs: keep a live ``pstree`` view going in a side terminal::
-
-    watch -n 0.1 "pstree -a $(pgrep -f pytest)"
-
-You'll see actor processes pop in and out of existence as each
-test builds and reaps its tree. Launch it *after* pytest is up
-(the pid is substituted once, at ``watch`` startup).
-
-Every subactor also sets its OS process title (via
-``setproctitle``) to ``_subactor[<name>@<uuid-prefix>]`` so the
-tree view shows *which actor is which* at a glance — and targeted
-greps stay easy::
-
-    pgrep -af '_subactor\['
-
-For a single example script, the repo's signature incantation
-spawns the watcher alongside your program and cleans it up after::
-
-    $TERM -e watch -n 0.1 "pstree -a $$" \
-        & python examples/parallelism/single_func.py \
-        && kill $!
-
-Env-var knobs
--------------
-
-Two env-vars override their corresponding runtime arguments
-*globally* — no application (or test) code changes required:
-
-``TRACTOR_SPAWN_METHOD``
-    Wins over any caller-passed ``start_method`` so you can drive
-    the whole suite (or any app) under a different spawn backend::
-
-        TRACTOR_SPAWN_METHOD=mp_spawn uv run pytest tests/ -x
-
-``TRACTOR_LOGLEVEL``
-    Wins over any caller-passed ``loglevel``; crank (or silence)
-    runtime console verbosity wholesale::
-
-        TRACTOR_LOGLEVEL=cancel uv run pytest tests/ -x -s
-
-``TRACTOR_ENABLE_STACKSCOPE``
-    Force-install the ``SIGUSR1`` task-tree dump handler in every
-    actor, debug-mode or not; then
-    ``pkill --signal SIGUSR1 -f <part-of-cmd>`` dumps every
-    actor's live ``trio`` task tree.
-
-Debug mode vs. pytest capture
------------------------------
-
-The tree-wide crash-to-REPL experience (``debug_mode=True`` plus
-``await tractor.pause()``) requires a **real tty**, and pytest's
-default output capturing swallows exactly that. When you want to
-interact with the REPL from inside a test run, disable capture::
-
-    uv run pytest tests/test_foo.py -x -s
-
-(``-s`` is shorthand for ``--capture=no``.)
-
-Tests should request the ``debug_mode`` fixture (driven by the
-``--tpdb`` flag) rather than hard-coding it, so that normal CI
-runs stay non-interactive.
-
-For *automated* REPL interaction — asserting on prompt output,
-sending debugger commands — you can't just turn capture off;
-instead do what ``tests/devx/`` does: drive a child Python program
-through pexpect_ on a real pseudo-tty and pattern-match the
-``(Pdb+)`` prompts. See ``tests/devx/test_debugger.py`` for many
-worked patterns.
-
-Examples *are* tests
---------------------
-
-Every script under ``examples/`` is run as a subprocess by
-``tests/test_docs_examples.py``; since these docs
-``literalinclude`` those same scripts, the code you read here is
-CI-verified on every push and can never silently rot B)
-
-Conventions when adding a new example:
-
-- make it a standalone runnable script with the usual guard::
-
-      if __name__ == '__main__':
-          trio.run(main)
-
-- it must exit cleanly (returncode ``0``) within the per-example
-  timeout (~16s locally, with headroom auto-added in CI and under
-  cpu-freq scaling) — keep sleeps short,
-
-- any stderr line containing ``Error`` fails the test, so silence
-  or assert-around expected error output,
-
-- don't crank ``tractor`` logging inside an example: subprocess
-  pipe **backpressure can deadlock** the run (ask us how we
-  know..),
-
-- filenames starting with ``_`` are skipped (the WIP convention),
-  as are the special subdirs (``debugging/``, ``integration/``,
-  ``advanced_faults/``, ``trio/``) which are driven by their own
-  dedicated suites instead.
-
-Drop your script in, run the example suite, profit::
-
-    uv run pytest tests/test_docs_examples.py -x
-
-Zombie cleanup
---------------
-
-First, the contract: ``tractor`` **always** reaps its children —
-if you can create a zombie process (without resorting to
-untrappable signals) it **is a bug**, please report it!
-
-That said, while hacking on the *runtime itself* you can
-definitely wedge things — a ``SIGKILL``-ed pytest, a half-broken
-spawn backend — and strand subactor procs plus their shm segments
-and UDS socket files. The repo ships a dedicated cleanup tool::
-
-    uv run scripts/tractor-reap --shm --uds
-
-It's SC-polite even as a reaper: matched processes get ``SIGINT``
-first with a bounded grace window — so actor runtimes can run
-their ``trio`` teardown paths — escalating to ``SIGKILL`` only as
-a last resort. The ``--shm`` sweep unlinks ``/dev/shm/`` segments
-that no live process has open (it leans on psutil_, already in
-your dev venv, to check live mappings and fds) and ``--uds``
-clears socket files whose binder pid is dead.
-
-Testing your own ``tractor`` app
---------------------------------
-
-The same plugin the suite uses ships in the package, so your
-project can load it too::
-
-    [tool.pytest.ini_options]
-    addopts = ['-p tractor._testing.pytest']
-
-That buys you the CLI flags above plus a set of fixtures —
-``loglevel``, ``debug_mode``, ``reg_addr`` (a session-unique
-registrar address so concurrent runs and other live ``tractor``
-apps on the host can't cross-talk) — and the ``@tractor_test``
-decorator:
-
-.. code:: python
-
-    import tractor
-    from tractor._testing import tractor_test
-
-    @tractor_test
-    async def test_my_service(
-        reg_addr: tuple,
-        loglevel: str,
-    ):
-        # already inside a root actor's trio task!
-        async with tractor.open_nursery() as an:
-            ...
-
-The decorator boots a root actor around your (async) test fn,
-wires any of the special fixtures you declare (``reg_addr``,
-``loglevel``, ``start_method``, ``debug_mode``) into
-``open_root_actor()``, and runs the body as the root-most task
-under a wall-clock ``trio.fail_after()`` guard.
-
-General advice that has served this suite well:
-
-- bound waits with ``trio.fail_after()`` *inside* tests; global
-  pytest timeout plugins interact badly with multi-process
-  ``trio`` teardown,
-
-- use the ``reg_addr`` fixture (or otherwise randomize your
-  registry addrs) so leftover registrars from prior runs can't
-  contaminate lookups,
-
-- assert on **structured outcomes** — eg.
-  ``RemoteActorError.boxed_type`` or
-  ``ContextCancelled.canceller`` — not on log text.
-
-.. note::
-   ``tractor._testing`` is still an underscore-internal namespace:
-   shipped and handy, but its API may shift between alpha
-   releases.
-
-(This page exists thanks to the ask in `#126`_.)
-
-.. seealso::
-   - :doc:`/guide/discovery` — how registrar wiring (the thing
-     ``reg_addr`` randomizes) works in the runtime proper.
-   - :doc:`/project/dev-tips` — contributor-oriented extras:
-     releases, log-system tracing, tree-monitoring recipes.
-
-.. _uv: https://docs.astral.sh/uv/
-.. _pexpect: https://pexpect.readthedocs.io/en/stable/
-.. _psutil: https://psutil.readthedocs.io/en/latest/
-.. _#126: https://github.com/goodboy/tractor/issues/126

docs/index.rst

@@ -1,151 +1,612 @@
-tractor
-=======
+.. tractor documentation master file, created by
+   sphinx-quickstart on Sun Feb  9 22:26:51 2020.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
 
-.. raw:: html
-   :file: _static/tractor_hero.html
+``tractor``
+===========
 
-``tractor`` provides parallelism via ``trio``
-*"actors"*:
-
-- independent Python **processes** each running a
-  ``trio`` task tree,
-- all composed into a *distributed supervision tree*
-  with end-to-end SC_,
-- spawning, cancellation, error propagation and
-  teardown that work **across processes** (and hosts)
-  exactly the way they work across tasks.
-
-Sixty seconds of why
---------------------
-.. margin:: tl;dr
-
-   It's **just** ``trio``, but with nurseries that
-   spawn *processes* and streams that cross them. If
-   you can read a ``trio`` program you can read a
-   ``tractor`` one — that's the whole pitch.
-
-Spawn one actor per core, open a ``Context`` into
-each — the child ``started()``-handshakes its name
-and pid back — then crash the root on purpose and
-watch the runtime contain the blast: errors
-propagate, *every* child is reaped, zero zombies —
-guaranteed (it's a bug otherwise).
-
-.. literalinclude:: ../examples/parallelism/we_are_processes.py
-   :caption: examples/parallelism/we_are_processes.py
-   :language: python
-
-Like every snippet in these docs this file lives in
-the repo's ``examples/`` dir and runs under CI — docs
-code that can't rot.
-
-Dig in
-------
-.. grid:: 1 2 2 3
-   :gutter: 3
-
-   .. grid-item-card:: Get started
-      :link: start/index
-      :link-type: doc
-
-      Install + your first actor tree in ~20 lines;
-      causality, daemons and the trynamic scene.
-
-   .. grid-item-card:: The big ideas
-      :link: explain/sc-distributed
-      :link-type: doc
-
-      SC across processes, distilled — then the
-      runtime architecture under it.
-
-   .. grid-item-card:: Debug like a local
-      :link: guide/debugging
-      :link-type: doc
-
-      ``await tractor.pause()`` anywhere in the
-      tree: one terminal, every process, zero
-      socket-juggling.
-
-   .. grid-item-card:: Streaming + contexts
-      :link: guide/context
-      :link-type: doc
-
-      Bidirectional, cancellation-safe msg streams
-      between any two actors.
-
-   .. grid-item-card:: Guides
-      :link: guide/index
-      :link-type: doc
-
-      RPC, supervision, clustering, "infected
-      asyncio", typed msging + more.
-
-   .. grid-item-card:: API reference
-      :link: api/index
-      :link-type: doc
-
-      The curated public surface; everything
-      importable from ``tractor``.
-
-Features
---------
-- **It's just a** ``trio`` **API** — same nursery
-  discipline, same cancellation semantics, one level
-  up the process tree.
-- *Infinitely nestable* process trees: sub-actors can
-  spawn sub-actors, supervision stays transitive.
-- A "native UX" **multi-process debugger REPL**:
-  built on pdbp_ with tree-wide tty locking (see
-  :doc:`guide/debugging`).
-- Built-in, cancellation-safe **bidirectional
-  streaming** via a `cheap or nasty`_ `(un)protocol`_.
-- **Typed IPC**: `msgspec`_-backed wire msgs with
-  optional per-dialog payload specs
-  (:doc:`guide/msging`).
-- Swappable process-spawn backends + modular IPC
-  transports (TCP today, UDS on same-host, more
-  planned).
-- Optionally distributed_: the same APIs work over
-  multiple hosts as on multiple cores.
-- "**Infected** ``asyncio``" mode: SC-supervise
-  ``asyncio`` tasks from ``trio``
-  (:doc:`guide/asyncio`).
-- ``trio`` extension goodies via ``tractor.trionics``
-  (acm gathering, single-resource caching, broadcast
-  channels).
-
-Where do i start!?
-------------------
-The first step to grok ``tractor`` is to get an
-intermediate knowledge of ``trio`` and **structured
-concurrency** B)
-
-Some great places to start are,
-
-- the seminal `blog post`_,
-- obviously the `trio docs`_,
-- wikipedia's nascent SC_ page,
-- the fancy diagrams @ libdill-docs_,
-
-then come back and hit :doc:`start/quickstart`.
+A `structured concurrent`_, async-native "`actor model`_" built on trio_ and multiprocessing_.
 
 .. toctree::
-   :hidden:
-   :maxdepth: 2
-
-   Get started <start/index>
-   Big ideas <explain/index>
-   Guides <guide/index>
-   API <api/index>
-   Project <project/index>
+   :maxdepth: 1
+   :caption: Contents:
 
+.. _actor model: https://en.wikipedia.org/wiki/Actor_model
 .. _trio: https://github.com/python-trio/trio
-.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
+.. _multiprocessing: https://en.wikipedia.org/wiki/Multiprocessing
+.. _trionic: https://trio.readthedocs.io/en/latest/design.html#high-level-design-principles
+.. _async sandwich: https://trio.readthedocs.io/en/latest/tutorial.html#async-sandwich
+.. _structured concurrent: https://trio.discourse.group/t/concise-definition-of-structured-concurrency/228
+
+
+``tractor`` is an attempt to bring trionic_ `structured concurrency`_ to
+distributed multi-core Python; it aims to be the Python multi-processing
+framework *you always wanted*.
+
+``tractor`` lets you spawn ``trio`` *"actors"*: processes which each run
+a ``trio`` scheduled task tree (also known as an `async sandwich`_).
+*Actors* communicate by exchanging asynchronous messages_ and avoid
+sharing any state. This model allows for highly distributed software
+architecture which works just as well on multiple cores as it does over
+many hosts.
+
+The first step to grok ``tractor`` is to get the basics of ``trio`` down.
+A great place to start is the `trio docs`_ and this `blog post`_.
+
+.. _messages: https://en.wikipedia.org/wiki/Message_passing
 .. _trio docs: https://trio.readthedocs.io/en/latest/
-.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html
-.. _pdbp: https://github.com/mdmintz/pdbp
-.. _msgspec: https://jcristharif.com/msgspec/
-.. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
-.. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
-.. _distributed: https://en.wikipedia.org/wiki/Distributed_computing
+.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
+.. _structured concurrency: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
+
+
+Install
+-------
+No PyPi release yet!
+
+::
+
+    pip install git+git://github.com/goodboy/tractor.git
+
+
+Feel like saying hi?
+--------------------
+This project is very much coupled to the ongoing development of
+``trio`` (i.e. ``tractor`` gets all its ideas from that brilliant
+community). If you want to help, have suggestions or just want to
+say hi, please feel free to ping me on the `trio gitter channel`_!
+
+.. _trio gitter channel: https://gitter.im/python-trio/general
+
+
+
+Philosophy
+----------
+Our tenets non-comprehensively include:
+
+- strict adherence to the `concept-in-progress`_ of *structured concurrency*
+- no spawning of processes *willy-nilly*; causality_ is paramount!
+- (remote) errors `always propagate`_ back to the parent supervisor
+- verbatim support for ``trio``'s cancellation_ system
+- `shared nothing architecture`_
+- no use of *proxy* objects or shared references between processes
+- an immersive debugging experience
+- anti-fragility through `chaos engineering`_
+
+``tractor`` is an actor-model-*like* system in the sense that it adheres
+to the `3 axioms`_ but does not (yet) fulfil all "unrequirements_" in
+practise. It is an experiment in applying `structured concurrency`_
+constraints on a parallel processing system where multiple Python
+processes exist over many hosts but no process can outlive its parent.
+In `erlang` parlance, it is an architecture where every process has
+a mandatory supervisor enforced by the type system. The API design is
+almost exclusively inspired by trio_'s concepts and primitives (though
+we often lag a little). As a distributed computing system `tractor`
+attempts to place sophistication at the correct layer such that
+concurrency primitives are powerful yet simple, making it easy to build
+complex systems (you can build a "worker pool" architecture but it's
+definitely not required). There is first class support for inter-actor
+streaming using `async generators`_ and ongoing work toward a functional
+reactive style for IPC.
+
+.. warning:: ``tractor`` is in alpha-alpha and is expected to change rapidly!
+    Expect nothing to be set in stone. Your ideas about where it should go
+    are greatly appreciated!
+
+.. _concept-in-progress: https://trio.discourse.group/t/structured-concurrency-kickoff/55
+.. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts
+.. _unrequirements: https://en.wikipedia.org/wiki/Actor_model#Direct_communication_and_asynchrony
+.. _async generators: https://www.python.org/dev/peps/pep-0525/
+.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
+.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
+.. _shared nothing architecture: https://en.wikipedia.org/wiki/Shared-nothing_architecture
+.. _cancellation: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-and-timeouts
+.. _channels: https://en.wikipedia.org/wiki/Channel_(programming)
+.. _chaos engineering: http://principlesofchaos.org/
+
+
+Examples
+--------
+Note, if you are on Windows please be sure to see the :ref:`gotchas
+<windowsgotchas>` section before trying these.
+
+
+A trynamic first scene
+**********************
+Let's direct a couple *actors* and have them run their lines for
+the hip new film we're shooting:
+
+.. literalinclude:: ../examples/a_trynamic_first_scene.py
+
+We spawn two *actors*, *donny* and *gretchen*.
+Each actor starts up and executes their *main task* defined by an
+async function, ``say_hello()``.  The function instructs each actor
+to find their partner and say hello by calling their partner's
+``hi()`` function using something called a *portal*. Each actor
+receives a response and relays that back to the parent actor (in
+this case our "director" executing ``main()``).
+
+
+Actor spawning and causality
+****************************
+``tractor`` tries to take ``trio``'s concept of causal task lifetimes
+to multi-process land. Accordingly, ``tractor``'s *actor nursery* behaves
+similar to ``trio``'s nursery_. That is, ``tractor.open_nursery()``
+opens an ``ActorNursery`` which **must** wait on spawned *actors* to complete
+(or error) in the same causal_ way ``trio`` waits on spawned subtasks.
+This includes errors from any one actor causing all other actors
+spawned by the same nursery to be cancelled_.
+
+To spawn an actor and run a function in it, open a *nursery block*
+and use the ``run_in_actor()`` method:
+
+.. literalinclude:: ../examples/actor_spawning_and_causality.py
+
+What's going on?
+
+- an initial *actor* is started with ``trio.run()`` and told to execute
+  its main task_: ``main()``
+
+- inside ``main()`` an actor is *spawned* using an ``ActorNusery`` and is told
+  to run a single function: ``cellar_door()``
+
+- a ``portal`` instance (we'll get to what it is shortly)
+  returned from ``nursery.run_in_actor()`` is used to communicate with
+  the newly spawned *sub-actor*
+
+- the second actor, *some_linguist*, in a new *process* running a new ``trio`` task_
+  then executes ``cellar_door()`` and returns its result over a *channel* back
+  to the parent actor
+
+- the parent actor retrieves the subactor's *final result* using ``portal.result()``
+  much like you'd expect from a future_.
+
+This ``run_in_actor()`` API should look very familiar to users of
+``asyncio``'s `run_in_executor()`_ which uses a ``concurrent.futures`` Executor_.
+
+Since you might also want to spawn long running *worker* or *daemon*
+actors, each actor's *lifetime* can be determined based on the spawn
+method:
+
+- if the actor is spawned using ``run_in_actor()`` it terminates when
+  its *main* task completes (i.e. when the (async) function submitted
+  to it *returns*). The ``with tractor.open_nursery()`` exits only once
+  all actors' main function/task complete (just like the nursery_ in ``trio``)
+
+- actors can be spawned to *live forever* using the ``start_actor()``
+  method and act like an RPC daemon that runs indefinitely (the
+  ``with tractor.open_nursery()`` won't exit) until cancelled_
+
+Here is a similar example using the latter method:
+
+.. literalinclude:: ../examples/actor_spawning_and_causality_with_daemon.py
+
+The ``enable_modules`` `kwarg` above is a list of module path
+strings that will be loaded and made accessible for execution in the
+remote actor through a call to ``Portal.run()``. For now this is
+a simple mechanism to restrict the functionality of the remote
+(and possibly daemonized) actor and uses Python's module system to
+limit the allowed remote function namespace(s).
+
+``tractor`` is opinionated about the underlying threading model used for
+each *actor*. Since Python has a GIL and an actor model by definition
+shares no state between actors, it fits naturally to use a multiprocessing_
+``Process``. This allows ``tractor`` programs to leverage not only multi-core
+hardware but also distribute over many hardware hosts (each *actor* can talk
+to all others with ease over standard network protocols).
+
+.. _task: https://trio.readthedocs.io/en/latest/reference-core.html#tasks-let-you-do-multiple-things-at-once
+.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning
+.. _causal: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#causality
+.. _cancelled: https://trio.readthedocs.io/en/latest/reference-core.html#child-tasks-and-cancellation
+.. _run_in_executor(): https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.loop.run_in_executor
+.. _Executor: https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Executor
+
+
+Cancellation
+************
+``tractor`` supports ``trio``'s cancellation_ system verbatim.
+Cancelling a nursery block cancels all actors spawned by it.
+Eventually ``tractor`` plans to support different `supervision strategies`_ like ``erlang``.
+
+.. _supervision strategies: http://erlang.org/doc/man/supervisor.html#sup_flags
+
+
+Remote error propagation
+************************
+Any task invoked in a remote actor should ship any error(s) back to the calling
+actor where it is raised and expected to be dealt with. This way remote actors
+are never cancelled unless explicitly asked or there's a bug in ``tractor`` itself.
+
+.. literalinclude:: ../examples/remote_error_propagation.py
+
+
+You'll notice the nursery cancellation conducts a *one-cancels-all*
+supervisory strategy `exactly like trio`_. The plan is to add more
+`erlang strategies`_ in the near future by allowing nurseries to accept
+a ``Supervisor`` type.
+
+.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
+.. _erlang strategies: http://learnyousomeerlang.com/supervisors
+
+
+IPC using *portals*
+*******************
+``tractor`` introduces the concept of a *portal* which is an API
+borrowed_ from ``trio``. A portal may seem similar to the idea of
+a RPC future_ except a *portal* allows invoking remote *async* functions and
+generators and intermittently blocking to receive responses. This allows
+for fully async-native IPC between actors.
+
+When you invoke another actor's routines using a *portal* it looks as though
+it was called locally in the current actor. So when you see a call to
+``await portal.run()`` what you get back is what you'd expect
+to if you'd called the function directly in-process. This approach avoids
+the need to add any special RPC *proxy* objects to the library by instead just
+relying on the built-in (async) function calling semantics and protocols of Python.
+
+Depending on the function type ``Portal.run()`` tries to
+correctly interface exactly like a local version of the remote
+built-in Python *function type*. Currently async functions, generators,
+and regular functions are supported. Inspiration for this API comes
+`remote function execution`_ but without the client code being
+concerned about the underlying channels_ system or shipping code
+over the network.
+
+This *portal* approach turns out to be paricularly exciting with the
+introduction of `asynchronous generators`_ in Python 3.6! It means that
+actors can compose nicely in a data streaming pipeline.
+
+.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
+
+Streaming
+*********
+By now you've figured out that ``tractor`` lets you spawn process based
+*actors* that can invoke cross-process (async) functions and all with
+structured concurrency built in. But the **real cool stuff** is the
+native support for cross-process *streaming*.
+
+
+Asynchronous generators
++++++++++++++++++++++++
+The default streaming function is simply an async generator definition.
+Every value *yielded* from the generator is delivered to the calling
+portal exactly like if you had invoked the function in-process meaning
+you can ``async for`` to receive each value on the calling side.
+
+As an example here's a parent actor that streams for 1 second from a
+spawned subactor:
+
+.. literalinclude:: ../examples/asynchronous_generators.py
+
+By default async generator functions are treated as inter-actor
+*streams* when invoked via a portal (how else could you really interface
+with them anyway) so no special syntax to denote the streaming *service*
+is necessary.
+
+
+Channels and Contexts
++++++++++++++++++++++
+If you aren't fond of having to write an async generator to stream data
+between actors (or need something more flexible) you can instead use
+a ``Context``. A context wraps an actor-local spawned task and
+a ``Channel`` so that tasks executing across multiple processes can
+stream data to one another using a low level, request oriented API.
+
+A ``Channel`` wraps an underlying *transport* and *interchange* format
+to enable *inter-actor-communication*. In its present state ``tractor``
+uses TCP and msgpack_.
+
+As an example if you wanted to create a streaming server without writing
+an async generator that *yields* values you instead define a decorated
+async function:
+
+.. code:: python
+
+   @tractor.stream
+   async def streamer(ctx: tractor.Context, rate: int = 2) -> None:
+      """A simple web response streaming server.
+      """
+      while True:
+         val = await web_request('http://data.feed.com')
+
+         # this is the same as ``yield`` in the async gen case
+         await ctx.send_yield(val)
+
+         await trio.sleep(1 / rate)
+
+
+You must decorate the function with ``@tractor.stream`` and declare
+a ``ctx`` argument as the first in your function signature and then
+``tractor`` will treat the async function like an async generator - as
+a stream from the calling/client side.
+
+This turns out to be handy particularly if you have multiple tasks
+pushing responses concurrently:
+
+.. code:: python
+
+   async def streamer(
+      ctx: tractor.Context,
+      rate: int = 2
+   ) -> None:
+      """A simple web response streaming server.
+      """
+      while True:
+         val = await web_request(url)
+
+         # this is the same as ``yield`` in the async gen case
+         await ctx.send_yield(val)
+
+         await trio.sleep(1 / rate)
+
+
+   @tractor.stream
+   async def stream_multiple_sources(
+      ctx: tractor.Context,
+      sources: List[str]
+   ) -> None:
+      async with trio.open_nursery() as n:
+         for url in sources:
+            n.start_soon(streamer, ctx, url)
+
+
+The context notion comes from the context_ in nanomsg_.
+
+.. _context: https://nanomsg.github.io/nng/man/tip/nng_ctx.5
+.. _msgpack: https://en.wikipedia.org/wiki/MessagePack
+
+
+
+A full fledged streaming service
+++++++++++++++++++++++++++++++++
+Alright, let's get fancy.
+
+Say you wanted to spawn two actors which each pull data feeds from
+two different sources (and wanted this work spread across 2 cpus).
+You also want to aggregate these feeds, do some processing on them and then
+deliver the final result stream to a client (or in this case parent) actor
+and print the results to your screen:
+
+.. literalinclude:: ../examples/full_fledged_streaming_service.py
+
+Here there's four actors running in separate processes (using all the
+cores on you machine). Two are streaming by *yielding* values from the
+``stream_data()`` async generator, one is aggregating values from
+those two in ``aggregate()`` (also an async generator) and shipping the
+single stream of unique values up the parent actor (the ``'MainProcess'``
+as ``multiprocessing`` calls it) which is running ``main()``. 
+
+.. _future: https://en.wikipedia.org/wiki/Futures_and_promises
+.. _borrowed:
+    https://trio.readthedocs.io/en/latest/reference-core.html#getting-back-into-the-trio-thread-from-another-thread
+.. _asynchronous generators: https://www.python.org/dev/peps/pep-0525/
+.. _remote function execution: https://codespeak.net/execnet/example/test_info.html#remote-exec-a-function-avoiding-inlined-source-part-i
+
+
+Actor local (aka *process global*) variables
+********************************************
+Although ``tractor`` uses a *shared-nothing* architecture between
+processes you can of course share state between tasks running *within*
+an actor (since a `trio.run()` runtime is single threaded). ``trio``
+tasks spawned via multiple RPC calls to an actor can modify
+*process-global-state* defined using Python module attributes:
+
+.. code:: python
+
+
+        # a per process cache
+        _actor_cache: dict[str, bool] = {}
+
+
+        def ping_endpoints(endpoints: List[str]):
+            """Start a polling process which runs completely separate
+            from our root actor/process.
+
+            """
+
+            # This runs in a new process so no changes # will propagate
+            # back to the parent actor
+            while True:
+
+                for ep in endpoints:
+                    status = await check_endpoint_is_up(ep)
+                    _actor_cache[ep] = status
+
+                await trio.sleep(0.5)
+
+
+        async def get_alive_endpoints():
+
+            nonlocal _actor_cache
+
+            return {key for key, value in _actor_cache.items() if value}
+
+
+        async def main():
+
+            async with tractor.open_nursery() as n:
+
+                portal = await n.run_in_actor(ping_endpoints)
+
+                # print the alive endpoints after 3 seconds
+                await trio.sleep(3)
+
+                # this is submitted to be run in our "ping_endpoints" actor
+                print(await portal.run(get_alive_endpoints))
+
+
+You can pass any kind of (`msgpack`) serializable data between actors using
+function call semantics but building out a state sharing system per-actor
+is totally up to you.
+
+
+Service Discovery
+*****************
+Though it will be built out much more in the near future, ``tractor``
+currently keeps track of actors by ``(name: str, id: str)`` using a
+special actor called the *arbiter*. Currently the *arbiter* must exist
+on a host (or it will be created if one can't be found) and keeps a
+simple ``dict`` of actor names to sockets for discovery by other actors.
+Obviously this can be made more sophisticated (help me with it!) but for
+now it does the trick.
+
+To find the arbiter from the current actor use the ``get_arbiter()`` function and to
+find an actor's socket address by name use the ``find_actor()`` function:
+
+.. literalinclude:: ../examples/service_discovery.py
+
+The ``name`` value you should pass to ``find_actor()`` is the one you passed as the
+*first* argument to either ``trio.run()`` or ``ActorNursery.start_actor()``.
+
+
+Running actors standalone
+*************************
+You don't have to spawn any actors using ``open_nursery()`` if you just
+want to run a single actor that connects to an existing cluster.
+All the comms and arbiter registration stuff still works. This can
+somtimes turn out being handy when debugging mult-process apps when you
+need to hop into a debugger. You just need to pass the existing
+*arbiter*'s socket address you'd like to connect to:
+
+.. code:: python
+
+    import trio
+    import tractor
+
+    async def main():
+
+        async with tractor.open_root_actor(
+            arbiter_addr=('192.168.0.10', 1616)
+        ):
+            await trio.sleep_forever()
+
+    trio.run(main)
+
+
+Choosing a process spawning backend
+***********************************
+``tractor`` is architected to support multiple actor (sub-process)
+spawning backends. Specific defaults are chosen based on your system
+but you can also explicitly select a backend of choice at startup
+via a ``start_method`` kwarg to ``tractor.open_nursery()``.
+
+Currently the options available are:
+
+- ``trio``: a ``trio``-native spawner which is an async wrapper around ``subprocess``
+- ``spawn``: one of the stdlib's ``multiprocessing`` `start methods`_
+- ``forkserver``: a faster ``multiprocessing`` variant that is Unix only
+
+.. _start methods: https://docs.python.org/3.8/library/multiprocessing.html#contexts-and-start-methods
+
+
+``trio``
+++++++++
+The ``trio`` backend offers a lightweight async wrapper around ``subprocess`` from the standard library and takes advantage of the ``trio.`` `open_process`_ API.
+
+.. _open_process: https://trio.readthedocs.io/en/stable/reference-io.html#spawning-subprocesses
+
+
+``multiprocessing``
++++++++++++++++++++
+There is support for the stdlib's ``multiprocessing`` `start methods`_.
+Note that on Windows *spawn* it the only supported method and on \*nix
+systems *forkserver* is the best method for speed but has the caveat
+that it will break easily (hangs due to broken pipes) if spawning actors
+using nested nurseries.
+
+In general, the ``multiprocessing`` backend **has not proven reliable**
+for handling errors from actors more then 2 nurseries *deep* (see `#89`_).
+If you for some reason need this consider sticking with alternative
+backends.
+
+.. _#89: https://github.com/goodboy/tractor/issues/89
+
+.. _windowsgotchas:
+
+Windows "gotchas"
+^^^^^^^^^^^^^^^^^
+On Windows (which requires the use of the stdlib's `multiprocessing`
+package) there are some gotchas. Namely, the need for calling
+`freeze_support()`_ inside the ``__main__`` context.  Additionally you
+may need place you `tractor` program entry point in a seperate
+`__main__.py` module in your package in order to avoid an error like the
+following ::
+
+    Traceback (most recent call last):
+      File "C:\ProgramData\Miniconda3\envs\tractor19030601\lib\site-packages\tractor\_actor.py", line 234, in _get_rpc_func
+        return getattr(self._mods[ns], funcname)
+    KeyError: '__mp_main__'
+
+
+To avoid this, the following is the **only code** that should be in your
+main python module of the program:
+
+.. code:: python
+
+    # application/__main__.py
+    import trio
+    import tractor
+    import multiprocessing
+    from . import tractor_app
+
+    if __name__ == '__main__':
+        multiprocessing.freeze_support()
+        trio.run(tractor_app.main)
+
+And execute as::
+
+    python -m application
+
+
+As an example we use the following code to test all documented examples
+in the test suite on windows:
+
+.. literalinclude:: ../examples/__main__.py
+
+See `#61`_ and `#79`_ for further details.
+
+.. _freeze_support(): https://docs.python.org/3/library/multiprocessing.html#multiprocessing.freeze_support
+.. _#61: https://github.com/goodboy/tractor/pull/61#issuecomment-470053512
+.. _#79: https://github.com/goodboy/tractor/pull/79
+
+
+Enabling logging
+****************
+Considering how complicated distributed software can become it helps to know
+what exactly it's doing (even at the lowest levels). Luckily ``tractor`` has
+tons of logging throughout the core. ``tractor`` isn't opinionated on
+how you use this information and users are expected to consume log messages in
+whichever way is appropriate for the system at hand. That being said, when hacking
+on ``tractor`` there is a prettified console formatter which you can enable to
+see what the heck is going on. Just put the following somewhere in your code:
+
+.. code:: python
+
+    from tractor.log import get_console_log
+    log = get_console_log('trace')
+
+
+What the future holds
+---------------------
+Stuff I'd like to see ``tractor`` do real soon:
+
+- TLS_, duh.
+- erlang-like supervisors_
+- native support for `nanomsg`_ as a channel transport
+- native `gossip protocol`_ support for service discovery and arbiter election
+- a distributed log ledger for tracking cluster behaviour
+- a slick multi-process aware debugger much like in celery_
+  but with better `pdb++`_ support
+- an extensive `chaos engineering`_ test suite
+- support for reactive programming primitives and native support for asyncitertools_ like libs
+- introduction of a `capability-based security`_ model
+
+.. _TLS: https://trio.readthedocs.io/en/latest/reference-io.html#ssl-tls-support
+.. _supervisors: https://github.com/goodboy/tractor/issues/22
+.. _nanomsg: https://nanomsg.github.io/nng/index.html
+.. _gossip protocol: https://en.wikipedia.org/wiki/Gossip_protocol
+.. _celery: http://docs.celeryproject.org/en/latest/userguide/debugging.html
+.. _asyncitertools: https://github.com/vodik/asyncitertools
+.. _pdb++: https://github.com/antocuni/pdb
+.. _capability-based security: https://en.wikipedia.org/wiki/Capability-based_security

docs/project/changelog.rst

@@ -1 +0,0 @@
-.. include:: ../../NEWS.rst

docs/project/dev-tips.rst

@@ -1,208 +0,0 @@
-Hot tips for ``tractor`` hackers
-================================
-
-This is a (perpetually WIP) guide for newcomers to the project,
-mostly to do with dev, testing, CI and release gotchas, reminders
-and best practises.
-
-``tractor`` is a fairly novel project compared to most since it is
-effectively a new way of doing distributed computing in Python and
-is much closer to working with an "application level runtime"
-(like erlang OTP or scala's akka project) than it is a traditional
-Python library. As such, having an arsenal of tools and recipes
-for figuring out the right way to debug problems when they do
-arise is somewhat of a necessity.
-
-Making a release
-----------------
-
-Nothing fancy: the traditional PyPA flow on the hatchling_ build
-backend, with uv_ doing the driving and towncrier_ generating the
-changelog.
-
-1. collect news fragments: user-facing changes should land with a
-   small ``.rst`` snippet under ``nooz/`` (see ``nooz/HOWTO.rst``;
-   fragment types are ``feature``, ``bugfix``, ``doc`` and
-   ``trivial``),
-
-2. render them into ``NEWS.rst``::
-
-       uvx towncrier build --version <version>
-
-3. build and upload (testpypi first if you're being careful)::
-
-       uv build
-       uvx twine upload -r testpypi dist/*
-       uvx twine upload dist/*
-
-How you organize built artifacts under ``dist/`` locally (per
-release sub-dirs and such) is entirely up to you.
-
-Keep in mind that PyPi releases tend to lag the ``main`` branch
-since we develop in the open — ``main`` is usually the thing to
-run when you want the latest.
-
-Debugging and monitoring actor trees
-------------------------------------
-
-Your "what is my tree doing right now?" toolbox, in escalation
-order:
-
-**Live process-tree view** — keep a ``watch``-ed ``pstree``
-running in a side terminal; actor procs are recognizable by their
-``_subactor[<name>@<uuid-prefix>]`` process titles. The exact
-one-liners (plus the ``pgrep`` marker recipes) live in
-:doc:`/guide/testing`.
-
-**SIGUSR1 task-tree dumps** — boot any tree with
-``enable_stack_on_sig=True`` (or export
-``TRACTOR_ENABLE_STACKSCOPE=1``) and every actor installs a
-stackscope_ signal handler. Then from any shell::
-
-    # dump every actor's live trio task tree:
-    pkill --signal SIGUSR1 -f <part-of-your-cmd>
-
-    # or for a single process:
-    kill -SIGUSR1 $(pgrep -f <part-of-your-cmd>)
-
-Each dump is also tee'd (append-mode) to
-``/tmp/tractor-stackscope-<pid>.log`` so you still get output
-under pytest capture or in CI. This works *without* debug-mode
-being enabled — it's the lightest-weight hang-investigation tool
-in the box.
-
-**The built-in multi-process debugger** — ``debug_mode=True``
-plus :func:`tractor.pause` and friends: the heavyweight champ for
-interactive, REPL-driven inspection of a whole tree (including
-crash handling). Remember pytest capture interplay — see
-:doc:`/guide/testing`.
-
-**Post-mortem zombie sweeps** — ``scripts/tractor-reap`` for the
-(should-be-rare!) cases where hacking on the runtime itself wedges
-a tree: a SIGINT-first, structured concurrency (SC) polite
-escalation, plus ``--shm`` and ``--uds`` leaked-resource sweeps.
-
-Using the log system to trace ``trio`` task flow
-------------------------------------------------
-
-The logging system is oriented around the **stack "layers" of the
-runtime**, letting you trace logical abstraction layers in the
-code — errors, cancellation, IPC and streaming, the low level
-transport and wire protocols — independently of one another.
-
-Concretely, ``tractor.log.get_logger()`` returns a
-``StackLevelAdapter`` sporting extra level-methods beyond the
-stdlib set, including:
-
-- ``.cancel()`` — cancellation-machinery flow,
-
-- ``.runtime()`` — actor-runtime lifecycle chatter,
-
-- ``.devx()`` — debugger/devx tooling internals,
-
-- ``.transport()`` — wire-level msging events.
-
-To get console output at any level from your own code::
-
-    from tractor.log import get_console_log
-    get_console_log('cancel')
-
-or, runtime-wide without touching code, just export
-``TRACTOR_LOGLEVEL=cancel`` (the env-var wins over caller-passed
-levels; great for test runs).
-
-When you want only *one subsystem* cranked, the suite's ``--tl``
-flag (and ``tractor.log.apply_logspec()``) accept a per-sublogger
-spec::
-
-    uv run pytest tests/... --tl 'devx:runtime,trionics:cancel'
-
-Every record's header includes the emitting actor and task names,
-so cross-process flows can be stitched back together by eyeball
-(or grep).
-
-Building these docs
--------------------
-The site you're reading is sphinx_ + the pydata-sphinx-theme_,
-with diagrams authored in d2_ (via our local ``.. d2::``
-directive) and *every* code block ``literalinclude``-d straight
-from ``examples/`` — so what you read is what CI runs, and it
-can't rot.
-
-The one-liner, from any dev shell::
-
-    uv run --group docs make -C docs html
-
-then open ``docs/_build/html/index.html``.
-
-**Nix users**: the d2_ diagram renderer is deliberately kept
-*out* of the default dev-shell so casual envs stay lean; it
-lives in an opt-in ``docs`` shell::
-
-    # enter the docs shell (puts `d2`, `uv` + python on PATH)
-    nix develop .#docs
-
-    # ...then build (diagrams re-render from docs/diagrams/*.d2)
-    uv run --group docs make -C docs html
-
-or as a one-shot without staying in the shell::
-
-    nix develop .#docs -c uv run --group docs make -C docs html
-
-**Live-reload** while editing — rebuild + browser refresh on
-every save::
-
-    nix develop .#docs -c uv run --with sphinx-autobuild \
-        --group docs sphinx-autobuild docs docs/_build/html
-    # then open http://127.0.0.1:8000
-
-**Share on your LAN**: bind the server to all interfaces
-(``--host 0.0.0.0``) instead of localhost, then hand a peer on
-your subnet ``http://<your-lan-ip>:8000``::
-
-    nix develop .#docs -c uv run --with sphinx-autobuild \
-        --group docs sphinx-autobuild docs docs/_build/html \
-        --host 0.0.0.0 --port 8000
-
-or statically serve an already-built tree (no rebuild-on-save)::
-
-    python -m http.server -d docs/_build/html --bind 0.0.0.0 8000
-
-``hostname -I`` prints the IP to share; note it's an
-unauthenticated server bound to every interface, so keep it to a
-trusted LAN.
-
-How the diagrams resolve,
-
-- ``.d2`` sources live in ``docs/diagrams/``; their rendered
-  SVGs are git-committed under ``docs/_diagrams/`` as a fallback,
-- with a ``d2`` binary on ``PATH`` (the ``docs`` shell, or set
-  ``D2_BIN='nix run nixpkgs#d2 --'``) any stale SVG re-renders at
-  build time,
-- with NO binary the committed SVGs are served as-is, so CI and
-  casual builds need no ``d2`` at all,
-- a ``.d2`` that *fails to compile* is a hard build error under
-  ``sphinx-build -W`` (the last-good committed SVG is left
-  untouched).
-
-The build is currently **warning-free**; keep it that way — the
-``-W`` flag turns any sphinx warning into a hard failure::
-
-    uv run --group docs sphinx-build -b html -W docs docs/_build/html
-
-A terser command cheat-sheet also lives at
-``notes_to_self/howtodocs.md``.
-
-.. seealso::
-   - :doc:`/guide/testing` — running the suite, watching trees
-     live, examples-as-tests conventions and the zombie-reaper.
-   - :doc:`/guide/discovery` — the registrar mechanics you'll
-     bump into when running multiple trees on one host.
-
-.. _hatchling: https://hatch.pypa.io/latest/
-.. _uv: https://docs.astral.sh/uv/
-.. _towncrier: https://towncrier.readthedocs.io/en/stable/
-.. _stackscope: https://github.com/oremanj/stackscope
-.. _sphinx: https://www.sphinx-doc.org/
-.. _pydata-sphinx-theme: https://pydata-sphinx-theme.readthedocs.io/
-.. _d2: https://d2lang.com

docs/project/index.rst

@@ -1,60 +0,0 @@
-Project
-=======
-Everything meta: where the project's been (the
-:doc:`changelog`), where it's going (the roadmap below),
-how to hack on it (:doc:`dev-tips` and
-:doc:`/guide/testing`) and where to find the humans.
-
-.. toctree::
-   :maxdepth: 1
-
-   changelog
-   dev-tips
-
-What the future holds
----------------------
-Help us push toward the future of distributed Python!
-Planned (or dreamed of) work non-comprehensively
-includes,
-
-- Erlang-style supervisors via composed context
-  managers (see `#22`_),
-- typed capability-based (dialog) protocols, ie.
-  evolving our `msg-spec`_ system into per-dialog
-  contracts (see `#196`_ with draft work in `#311`_),
-- a higher level "service manager" API for daemon
-  lifetime mgmt over actor trees (in the works on an
-  experimental branch as ``tractor.hilevel``),
-- richer `discovery`_ via gossip and/or
-  `rendezvous protocol`_ approaches (today's registrar
-  is intentionally naive),
-- more IPC transports: the current ``tcp`` | ``uds``
-  pair wants friends (QUIC, shm-ring-buffers, RUDP,
-  wireguard tunnels),
-- an extensive `chaos engineering`_ test suite,
-- a respawn-from-REPL system for crashed (sub-)actors.
-
-Feel like saying hi?
---------------------
-This project is very much coupled to the ongoing
-development of ``trio`` (i.e. ``tractor`` gets most of
-its ideas from that brilliant community). If you want
-to help, have suggestions or just want to say hi,
-please feel free to reach us in our `matrix channel`_.
-If matrix seems too hip, we're also mostly all in the
-`trio gitter channel`_!
-
-Contributions of all kinds welcome: docs, examples,
-bug reports, new transports, supervisor strategies,
-philosophical debates about what an "actor model"
-really is B)
-
-.. _#22: https://github.com/goodboy/tractor/issues/22
-.. _#196: https://github.com/goodboy/tractor/issues/196
-.. _#311: https://github.com/goodboy/tractor/pull/311
-.. _msg-spec: https://jcristharif.com/msgspec/
-.. _discovery: https://zguide.zeromq.org/docs/chapter8/#Discovery
-.. _rendezvous protocol: https://en.wikipedia.org/wiki/Rendezvous_protocol
-.. _chaos engineering: https://principlesofchaos.org/
-.. _matrix channel: https://matrix.to/#/!tractor:matrix.org
-.. _trio gitter channel: https://gitter.im/python-trio/general

docs/start/index.rst

@@ -1,36 +0,0 @@
-Getting started
-===============
-Welcome aboard B)
-
-Real talk before any code: the first step to grok ``tractor`` is
-to get an intermediate knowledge of ``trio`` and **structured
-concurrency** (SC). ``tractor`` **is just** ``trio`` - but with
-nurseries for process management and cancel-able streaming IPC -
-so every rule you already know about task lifetimes, cancellation
-and error propagation keeps holding, just now across process (and
-host!) boundaries. Some great places to start are,
-
-- the seminal `blog post`_,
-- obviously the `trio docs`_,
-- wikipedia's nascent SC_ page,
-- the fancy diagrams @ libdill-docs_.
-
-Once you've taken in (some of) the canon, get installed and go
-spawn your first actor tree:
-
-.. toctree::
-   :maxdepth: 1
-
-   install
-   quickstart
-
-.. seealso::
-
-   Already installed and itching? Jump straight to
-   :doc:`/start/quickstart`; once you're through the on-ramp the
-   :doc:`guide pages </guide/index>` take each subsystem deeper.
-
-.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
-.. _trio docs: https://trio.readthedocs.io/en/latest/
-.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html

docs/start/install.rst

@@ -1,75 +0,0 @@
-Install
-=======
-``tractor`` is still in an *alpha-near-beta-stage* for many of
-its subsystems, however we are very close to having a stable
-lowlevel runtime and API. Expect the occasional rough edge (and
-feel free to report it!).
-
-Supported platforms
--------------------
-- **python**: ``>=3.13,<3.15`` - yes, we ride near the front of
-  the release train; 3.14 additionally unlocks the experimental
-  PEP-734 sub-interpreter spawn backend,
-- **linux**: the primary development and CI platform,
-- **macos**: officially supported,
-- **windows**: currently *untested* - we disabled CI-testing on
-  windows a while back and haven't had the cycles to revive it.
-  It mostly worked historically; if you're a windows person we'd
-  love a hand getting it back in the test matrix.
-
-With ``uv`` (preferred)
------------------------
-We use the very hip uv_ for project mgmt and recommend you do
-too. Add ``tractor`` to your project::
-
-    uv add tractor
-
-or, since the git ``main`` branch is often much further ahead
-than any latest release (see the PyPi note below), track ``main``
-directly::
-
-    uv add "tractor @ git+https://github.com/goodboy/tractor.git"
-
-From PyPi
----------
-We ofc also offer "releases" on PyPi_::
-
-    pip install tractor
-
-Just note that **YMMV** since ``main`` is usually well ahead of
-the latest published alpha; when in doubt go with a git install
-as per above (or hack from source as per below).
-
-From source
------------
-To run the bundled examples in-tree, or to start hacking on the
-code base, clone and sync a dev env::
-
-    git clone https://github.com/goodboy/tractor.git
-    cd tractor
-    uv sync --dev
-    uv run python examples/rpc_bidir_streaming.py
-
-Consider activating a virtual/project-env before starting to hack
-on the code base::
-
-    # you could use plain ol' venvs
-    # https://docs.astral.sh/uv/pip/environments/
-    uv venv tractor_py313 --python 3.13
-
-    # but @goodboy prefers the more explicit (and shell agnostic)
-    # https://docs.astral.sh/uv/configuration/environment/#uv_project_environment
-    UV_PROJECT_ENVIRONMENT="tractor_py313"
-
-    # hint hint, enter @goodboy's fave shell B)
-    uv run --dev xonsh
-
-.. seealso::
-
-   All set? Go boot a process tree in :doc:`/start/quickstart`.
-   And if the install fights you, swing by the `matrix channel`_
-   and we'll sort it out.
-
-.. _uv: https://docs.astral.sh/uv/
-.. _PyPi: https://pypi.org/project/tractor/
-.. _matrix channel: https://matrix.to/#/!tractor:matrix.org

docs/start/quickstart.rst

@@ -1,279 +0,0 @@
-Quickstart
-==========
-Time to spawn something B)
-
-If you take one thing from this page make it this: ``tractor``
-**is just** ``trio`` - but with nurseries for process management
-and cancel-able streaming IPC. Every "*actor*" you'll meet below
-is a plain Python **process** running its own ``trio.run()``
-scheduled task tree, linked back to its parent through an IPC
-protocol which keeps the whole tree `structured concurrency`_
-(SC) compliant end-to-end. If you know your nursery_ semantics
-you already know most of ``tractor``; we just stretch them across
-the process boundary.
-
-.. d2:: diagrams/actor_tree.d2
-   :alt: a supervision tree of actor processes
-   :margin:
-   :caption: every arrow is a parent which **must wait** on its kids
-
-Your first actor tree
----------------------
-``trio`` takes the hard-line position that a parent task **must
-wait** on the children it spawns; causality_ is paramount! So
-does ``tractor``, one abstraction layer up:
-``tractor.open_nursery()`` yields an ``ActorNursery`` which
-**must** wait on its spawned *subactors* to complete (or error)
-before the ``async with`` block exits, in the same causal_ way a
-``trio`` nursery waits on its subtasks. That includes any one
-child's crash cancelling all of its siblings: *one-cancels-all*
-supervision, `exactly like trio`_.
-
-Enough preamble, spawn a process:
-
-.. literalinclude:: ../../examples/actor_spawning_and_causality.py
-   :caption: examples/actor_spawning_and_causality.py
-   :language: python
-
-Run it::
-
-    $ python examples/actor_spawning_and_causality.py
-    Dang that's beautiful
-
-What's going on here?
-
-- ``trio.run(main)`` starts the **root actor**; the ``tractor``
-  runtime boots *implicitly* inside ``tractor.open_nursery()``
-  whenever it isn't already up. No special entrypoint, no
-  framework takeover - it's just a ``trio`` app,
-- inside ``main()`` a *subactor* is spawned via
-  ``ActorNursery.run_in_actor()`` and told to run exactly one
-  function: ``cellar_door()``,
-- you get back a ``Portal``: your handle for invoking tasks in
-  the new process's (separate!) memory domain. We lean on it
-  much harder in the next section,
-- the subactor, *some_linguist*, boots a fresh ``trio.run()`` in
-  a **new process** and executes ``cellar_door()`` as its *main
-  task* (note the child proving it is *not* the root with
-  ``tractor.is_root_process()``), then ships the return value
-  back over IPC,
-- the parent grabs that *final result* with
-  ``await portal.wait_for_result()``, much like you'd expect
-  from a "future" - except causality is preserved: the nursery
-  block only exits once the child is *done*, dead, and reaped.
-
-.. margin:: Just need a worker pool?
-
-   If all you want is to throw *sync* functions at your cores,
-   also check out trio-parallel_. ``tractor`` is aimed at
-   structured, (possibly) distributed *trees* of cooperating
-   ``trio`` programs; a worker pool is a trivial special case.
-
-.. note::
-
-   ``run_in_actor()`` is the *convenience* wrapper: one-shot
-   spawn-run-reap semantics for when a subactor's entire job is
-   a single function call. The core primitives are
-   ``ActorNursery.start_actor()`` (next up) paired with
-   ``Portal.open_context()`` for full, SC-linked cross-actor
-   dialogs - see :doc:`/guide/context`.
-
-Daemon actors and RPC
----------------------
-A ``run_in_actor()``-spawned actor terminates when its main task
-returns. But often you want long-lived *daemon* actors instead:
-spawned once, then serving (allowlisted) RPC requests until told
-otherwise. That's ``start_actor()``:
-
-.. literalinclude:: ../../examples/actor_spawning_and_causality_with_daemon.py
-   :caption: examples/actor_spawning_and_causality_with_daemon.py
-   :language: python
-
-Two lifetime rules to internalize:
-
-- a ``run_in_actor()`` actor lives exactly as long as its main
-  task; the nursery waits for that function (and thus the
-  process) to complete before unblocking,
-- a ``start_actor()`` actor *lives forever* - an RPC daemon the
-  nursery will happily wait on **indefinitely** - until some
-  task explicitly cancels it via ``Portal.cancel_actor()`` (as
-  above), or its parent nursery is cancelled wholesale.
-
-.. tip::
-
-   Want your *entire program* to just be a long-lived RPC
-   daemon? ``tractor.run_daemon()`` is the blocking shorthand:
-   it ``trio.run()``\s a root actor which serves requests until
-   cancelled.
-
-The ``enable_modules=[__name__]`` kwarg is the other thing to
-notice: it lists the module paths the subactor will load and
-*expose* for remote invocation.
-``await portal.run(movie_theatre_question)`` works because this
-very module is in that allowlist (and note we call it twice; the
-daemon happily serves repeat requests). Ask for a function from
-any module *not* enabled and you're denied with a
-``ModuleNotExposed`` error: a simple, capability-style
-restriction mechanism built on Python's own module system.
-
-We are *processes*
-------------------
-Why processes (and not, say, threads)? Python has a GIL and an
-`actor model`_ by definition shares **nothing** between its
-concurrent units, so real OS processes are the natural fit: you
-get all your cores locally, and since actors only ever talk via
-IPC, the exact same code distributes over multiple hosts without
-modification.
-
-Of course, the moment you hear "process trees" you should be
-asking: *what about zombies?* Watch ``tractor`` eat one for
-breakfast - run this while monitoring your process tree::
-
-    $TERM -e watch -n 0.1  "pstree -a $$" \
-        & python examples/parallelism/we_are_processes.py \
-        && kill $!
-
-.. literalinclude:: ../../examples/parallelism/we_are_processes.py
-   :caption: examples/parallelism/we_are_processes.py
-   :language: python
-
-.. margin:: Who's who in ``pstree``?
-
-   Every subactor (best-effort, via the optional
-   ``setproctitle`` dep) re-titles its OS process like
-   ``_subactor[worker_0@<pid>]``, so ``pstree``/``htop``/
-   ``pgrep -f`` can tell your actors apart at a glance.
-
-You'll see something like (one subactor per core - 24 on this box,
-trimmed here)::
-
-    $ python examples/parallelism/we_are_processes.py
-    This tree will self-destruct in 2s..
-
-    Started ep-task in subactor,
-    0::'worker_0'@218140
-
-    Started ep-task in subactor,
-    2::'worker_2'@218134
-
-    Started ep-task in subactor,
-    1::'worker_1'@218137
-
-    Started ep-task in subactor,
-    3::'worker_3'@218132
-
-    Zombies Contained
-
-(The ``Started ep-task`` lines land in whatever order the OS
-schedules them; they're separate *processes*, racing, and that's
-the point.)
-
-One subactor is spawned per core - concurrently, from background
-``trio`` tasks, so each child's cold ``import tractor`` overlaps
-instead of stacking. Each runs a ``@tractor.context``
-``endpoint()`` that ``ctx.started()``-hands its name and pid back
-through ``Portal.open_context()`` (those ``Started ep-task``
-lines), then parks in ``trio.sleep_forever()``. Then the root
-*crashes on purpose* and the ``ActorNursery`` responds with hard
-``trio`` discipline: every child is cancelled, every process is
-reaped, the error propagates to ``trio.run()``, and your terminal
-prints ``Zombies Contained``. No orphans, no ``kill -9``
-archaeology in ``htop`` afterwards.
-
-.. note::
-
-   **The zombie-safety guarantee**: ``tractor`` tries to protect
-   you from zombies, *no matter what*. If you can create zombie
-   child processes (without using a system signal) it **is a
-   bug** - please report it so we can hunt it down.
-
-A trynamic first scene
-----------------------
-So far the root actor has done all the talking, but subactors
-can just as well discover and call *each other*. Let's direct a
-couple actors and have them run their lines for the hip new film
-we're shooting:
-
-.. literalinclude:: ../../examples/a_trynamic_first_scene.py
-   :caption: examples/a_trynamic_first_scene.py
-   :language: python
-
-The script of the scene (runtime ``INFO`` log lines trimmed)::
-
-    $ python examples/a_trynamic_first_scene.py
-    Alright... Action!
-    Hi my name is gretchen
-    Hi my name is donny
-    CUTTTT CUUTT CUT!!! Donny!! You're supposed to say...
-
-The new tricks in play:
-
-- two subactors, *donny* and *gretchen*, are each told to run
-  ``say_hello()`` targeting the *other* by name,
-- ``tractor.wait_for_actor()`` blocks until the named peer has
-  registered with the tree's *registrar* (every actor announces
-  itself at boot), then yields a ``Portal`` connected
-  **directly** to that peer,
-- each actor invokes its partner's ``hi()`` over that portal:
-  actor-to-actor RPC with the root merely *directing* - and both
-  final lines flow back to ``main()`` via
-  ``await portal.wait_for_result()``,
-- ``tractor.log.get_console_log("INFO")`` cranks up runtime
-  logging so you can watch the spawn/register/cancel machinery
-  narrate itself; remove it for a quiet set.
-
-Cross-actor calls look just like (async) function calls; there
-are no proxy objects and no shared references, only messages B)
-
-Crash handling, native feeling
-------------------------------
-One last teaser before the guide proper. Flip exactly one
-switch:
-
-.. code:: python
-
-    async with tractor.open_nursery(
-        debug_mode=True,
-    ) as an:
-        ...
-
-and any crash, in *any* actor at *any* depth of the tree, drops
-your terminal into a multi-process-safe pdbp_ REPL at the
-offending frame, with the rest of the tree held back from
-clobbering the tty. ``await tractor.pause()`` likewise gives you
-a breakpoint that *just works* inside subprocesses. We think it
-might be the first native multi-process debugging UX for Python;
-get the full tour in :doc:`/guide/debugging`.
-
-Where to next?
---------------
-You can now boot a runtime, spawn one-shot and daemon actors,
-make cross-process RPC calls, and contain zombies: that's the
-on-ramp done. The guide takes each subsystem deeper,
-
-- :doc:`/explain/sc-distributed` - the structured concurrency
-  worldview and how ``tractor`` extends it across processes,
-- :doc:`/guide/spawning` - everything ``ActorNursery``: spawn
-  kwargs, lifetimes and supervision semantics,
-- :doc:`/guide/rpc` - the ``Portal`` in depth: calling into
-  another actor's memory domain,
-- :doc:`/guide/context` - the core API: ``@tractor.context``
-  endpoints, the ``ctx.started()`` handshake, and SC-linked
-  cross-actor task pairs,
-- :doc:`/guide/streaming` - bidirectional ``MsgStream`` dialogs
-  and fan-out broadcasting,
-- :doc:`/guide/debugging` - the multi-process REPL, crash
-  handling mode, and ``tractor.pause()``,
-- :doc:`/guide/asyncio` - "infected ``asyncio``" mode: SC
-  supervision wrapped around ``asyncio`` tasks,
-- :doc:`/guide/discovery` - registries, service daemons, and
-  finding actors from anywhere in (or out of) the tree.
-
-.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning
-.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
-.. _causal: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#causality
-.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
-.. _actor model: https://en.wikipedia.org/wiki/Actor_model
-.. _trio-parallel: https://github.com/richardsheridan/trio-parallel
-.. _pdbp: https://github.com/mdmintz/pdbp

examples/a_trynamic_first_scene.py

@@ -35,8 +35,8 @@ async def main():
             name='gretchen',
             other_actor='donny',
         )
-        print(await gretchen.wait_for_result())
-        print(await donny.wait_for_result())
+        print(await gretchen.result())
+        print(await donny.result())
         print("CUTTTT CUUTT CUT!!! Donny!! You're supposed to say...")
 
 

examples/actor_spawning_and_causality.py

@@ -20,7 +20,7 @@ async def main():
     # The ``async with`` will unblock here since the 'some_linguist'
     # actor has completed its main task ``cellar_door``.
 
-    print(await portal.wait_for_result())
+    print(await portal.result())
 
 
 if __name__ == '__main__':

examples/debugging/shielded_pause.py

@@ -78,7 +78,7 @@ async def main():
         portal: tractor.Portal = await n.run_in_actor(
             cancelled_before_pause,
         )
-        await portal.wait_for_result()
+        await portal.result()
 
         # ensure the same works in the root actor!
         await pm_on_cancelled()

examples/debugging/subactor_breakpoint.py

@@ -22,7 +22,7 @@ async def main():
         portal = await n.run_in_actor(
             breakpoint_forever,
         )
-        await portal.wait_for_result()
+        await portal.result()
 
 
 if __name__ == '__main__':

examples/debugging/subactor_error.py

@@ -18,10 +18,10 @@ async def main():
         p: tractor.Portal = await an.run_in_actor(name_error)
 
         # with this style, should raise on this line
-        await p.wait_for_result()
+        await p.result()
 
         # with this alt style should raise at `open_nusery()`
-        # return await p.wait_for_result()
+        # return await p.result()
 
 
 if __name__ == '__main__':

examples/nested_actor_tree.py

@@ -1,105 +0,0 @@
-'''
-Demonstrate a (3-level) nested actor tree where one RPC from
-the root fans out through a mid-tier 'supervisor' actor to
-2 'leaf' worker actors and an aggregate result is relayed
-back up.
-
-The process tree should look approximately like:
-
-python examples/nested_actor_tree.py
-`-python -m tractor._child --uid ('supervisor', '7c9b1039 ..)
-  |-python -m tractor._child --uid ('leaf_1', '92d62f50 ..)
-  `-python -m tractor._child --uid ('leaf_2', 'de91fdf5 ..)
-
-Teardown runs inside-out: the supervisor cancels its leaves
-first, then the root cancels the supervisor; watch the
-prints to see the ordering.
-
-'''
-import trio
-import tractor
-
-
-async def compute_square(x: int) -> int:
-    '''
-    Tiny "work unit" run inside a leaf actor.
-
-    '''
-    name: str = tractor.current_actor().name
-    print(f'{name}: squaring {x}')
-    return x * x
-
-
-@tractor.context
-async def fan_out_squares(
-    ctx: tractor.Context,
-    vals: list[int],
-) -> list[int]:
-    '''
-    Spawn a (nested) pair of leaf actors, fan the input vals
-    out across them round-robin style, then return the
-    aggregated squares to our parent.
-
-    '''
-    async with tractor.open_nursery() as an:
-        portals: list[tractor.Portal] = []
-        for i in (1, 2):
-            portals.append(
-                await an.start_actor(
-                    f'leaf_{i}',
-                    enable_modules=[__name__],
-                )
-            )
-        # unblock the parent's `.open_context()` entry and
-        # report which leaves came up.
-        await ctx.started(
-            [p.chan.aid.name for p in portals]
-        )
-        squares: dict[int, int] = {}
-
-        async def run_in_leaf(
-            portal: tractor.Portal,
-            x: int,
-        ) -> None:
-            squares[x] = await portal.run(
-                compute_square,
-                x=x,
-            )
-
-        # fan out one sub-RPC per input val, concurrently.
-        async with trio.open_nursery() as tn:
-            for i, x in enumerate(vals):
-                tn.start_soon(
-                    run_in_leaf,
-                    portals[i % len(portals)],
-                    x,
-                )
-        # graceful inside-out teardown: leaves go first!
-        for portal in portals:
-            leaf_name: str = portal.chan.aid.name
-            print(f'supervisor: cancelling {leaf_name}')
-            await portal.cancel_actor()
-    return [squares[x] for x in vals]
-
-
-async def main() -> None:
-    async with tractor.open_nursery() as an:
-        portal = await an.start_actor(
-            'supervisor',
-            enable_modules=[__name__],
-        )
-        async with portal.open_context(
-            fan_out_squares,
-            vals=[1, 2, 3, 4],
-        ) as (ctx, leaf_names):
-            print(f'root: supervisor spawned {leaf_names}')
-            squares: list[int] = await ctx.wait_for_result()
-            assert squares == [1, 4, 9, 16]
-            print(f'root: aggregate result {squares}')
-        print('root: cancelling supervisor')
-        await portal.cancel_actor()
-    print('root: tree torn down, what zombies?')
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/parallelism/_concurrent_futures_primes.py

@@ -1,19 +1,7 @@
-'''
-The pure-stdlib `concurrent.futures.ProcessPoolExecutor`
-primes demo (from the std docs) verbatim; the baseline twin
-of `concurrent_actors_primes.py`.
-
-The `async def main()` + `trio.run()` shim at the bottom only
-exists so the docs-example test runner can exercise this
-script; the executor code itself is untouched stdlib fare.
-
-'''
 import time
 import concurrent.futures
 import math
 
-import trio
-
 PRIMES = [
     112272535095293,
     112582705942171,
@@ -38,7 +26,7 @@ def is_prime(n):
     return True
 
 
-def check_primes():
+def main():
     with concurrent.futures.ProcessPoolExecutor() as executor:
         start = time.time()
 
@@ -48,14 +36,8 @@ def check_primes():
         print(f'processing took {time.time() - start} seconds')
 
 
-async def main() -> None:
-    # thin shim: the pool blocks this (sole) trio task
-    # which is just fine for a one-shot baseline script.
-    check_primes()
-
-
 if __name__ == '__main__':
 
     start = time.time()
-    trio.run(main)
+    main()
     print(f'script took {time.time() - start} seconds')

examples/parallelism/single_func.py

@@ -33,7 +33,7 @@ async def main():
         await burn_cpu()
 
         # wait on result from target function
-        pid = await portal.wait_for_result()
+        pid = await portal.result()
 
     # end of nursery block
     print(f"Collected subproc {pid}")

examples/parallelism/we_are_processes.py

@@ -1,11 +1,11 @@
-'''
+"""
 Run with a process monitor from a terminal using::
 
     $TERM -e watch -n 0.1  "pstree -a $$" \
         & python examples/parallelism/we_are_processes.py \
         && kill $!
 
-'''
+"""
 from multiprocessing import cpu_count
 import os
 
@@ -13,70 +13,26 @@ import tractor
 import trio
 
 
-@tractor.context
-async def endpoint(
-    ctx: tractor.Context,
-):
-    actor_name: str = tractor.current_actor().name
-    pid: int = os.getpid()
-    await ctx.started((actor_name, pid))
+async def target():
+    print(
+        f"Yo, i'm '{tractor.current_actor().name}' "
+        f"running in pid {os.getpid()}"
+    )
+
     await trio.sleep_forever()
 
 
-async def spawn_and_open_ep(
-    an: tractor.ActorNursery,
-    i: int,
-) -> None:
-    '''
-    Spawn a subactor, start a remote `endpoint()`-task in it.
-
-    '''
-    ptl: tractor.Portal = await an.start_actor(
-        name=f'worker_{i}',
-        enable_modules=[__name__],
-    )
-    ctx: tractor.Context
-    async with ptl.open_context(endpoint) as (
-        ctx,
-        (sub_name, sub_pid),
-    ):
-        print(
-            f'Started ep-task in subactor,\n'
-            f'{i}::{sub_name!r}@{sub_pid}\n'
-        )
-        await ctx.wait_for_result()
-
-
 async def main():
-    '''
-    Spawn a subactor-per-CPU then self-destruct the cluster.
 
-    '''
-    tn: trio.Nursery
-    an: tractor.ActorNursery
-    async with (
-        tractor.open_nursery(
-            # XXX coming soon!
-            # https://github.com/goodboy/tractor/pull/463
-            # start_method='main_thread_forkserver',
-        ) as an,
-        # spawn subs concurrently (in bg `trio.Task`s) so each
-        # actor's cold `import tractor` (~0.4s, see #470) overlaps
-        # instead of stacking; once forkserver (#463) lands, spawn
-        # is cheap enough to just loop sequentially.
-        trio.open_nursery() as tn,
-    ):
+    async with tractor.open_nursery() as n:
+
         for i in range(cpu_count()):
-            tn.start_soon(
-                spawn_and_open_ep,
-                an,
-                i,
-            )
-        destruct_in: int = 2
-        print(
-            f'This tree will self-destruct in {destruct_in}s..\n'
-        )
-        await trio.sleep(destruct_in)
+            await n.run_in_actor(target, name=f'worker_{i}')
+
+        print('This process tree will self-destruct in 1 sec...')
+        await trio.sleep(1)
+
+        # you could have done this yourself
         raise Exception('Self Destructed')
 
 

examples/service_daemon_discovery.py

@@ -1,68 +0,0 @@
-'''
-Demonstrate the "service daemon" pattern: a named,
-long-lived actor spawned via `ActorNursery.start_actor()`
-which any other task can locate through the registrar using
-`tractor.find_actor()` / `tractor.wait_for_actor()` - no
-spawn-portal required - and RPC into directly.
-
-Teardown is explicit and graceful via `portal.cancel_actor()`
-once the clients are done.
-
-'''
-import trio
-import tractor
-
-_quotes: dict[str, float] = {
-    'btcusdt': 66_000.5,
-    'ethusdt': 3_500.25,
-}
-
-
-async def get_quote(sym: str) -> float:
-    '''
-    Look up the "current" quote for a symbol.
-
-    '''
-    name: str = tractor.current_actor().name
-    print(f'{name}: serving quote for {sym!r}')
-    return _quotes[sym]
-
-
-async def client_task() -> None:
-    '''
-    Locate the quote service by name and RPC it; note no
-    spawn-nursery/portal reference is ever passed in here!
-
-    '''
-    # a lookup miss yields `None` (not an error).
-    async with tractor.find_actor('no_such_svc') as portal:
-        assert portal is None
-        print('client: "no_such_svc" is not registered')
-    # block until the service shows up in the registry,
-    # then call into it through the delivered portal.
-    async with tractor.wait_for_actor('quote_svc') as portal:
-        quote: float = await portal.run(
-            get_quote,
-            sym='btcusdt',
-        )
-        print(f'client: got btcusdt quote {quote}')
-
-
-async def main() -> None:
-    async with tractor.open_nursery() as an:
-        portal = await an.start_actor(
-            'quote_svc',
-            enable_modules=[__name__],
-        )
-        # run the client in a separate task which discovers
-        # the daemon purely by its registered name.
-        async with trio.open_nursery() as tn:
-            tn.start_soon(client_task)
-        # explicit graceful teardown of the daemon.
-        print('root: cancelling quote_svc')
-        await portal.cancel_actor()
-    print('root: service shut down cleanly')
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/streaming_broadcast_fanout.py

@@ -1,84 +0,0 @@
-'''
-Demonstrate fanning out ONE inter-actor `MsgStream` to N
-local (parent-side) trio tasks using `MsgStream.subscribe()`:
-each subscriber gets its own `BroadcastReceiver` copy of
-every msg from the single underlying IPC stream.
-
-The child waits for a 'go' msg so that all subscribers are
-guaranteed-attached before the first tick is sent; when the
-child's stream closes each subscriber's `async for` ends
-cleanly.
-
-'''
-import trio
-import tractor
-
-
-@tractor.context
-async def tick_stream(
-    ctx: tractor.Context,
-    count: int,
-) -> None:
-    '''
-    Send `count` "ticks" once the parent says go.
-
-    '''
-    await ctx.started(count)
-    async with ctx.open_stream() as stream:
-        # wait for the go-signal ensuring every parent-side
-        # subscriber is attached before any tick is sent.
-        assert await stream.receive() == 'go'
-        for i in range(count):
-            await stream.send(i)
-        # falling out gracefully closes our stream side;
-        # all parent-side subscribers see end-of-channel.
-
-
-async def consume(
-    name: str,
-    stream: tractor.MsgStream,
-    task_status: trio.TaskStatus = trio.TASK_STATUS_IGNORED,
-) -> None:
-    '''
-    Consume a private broadcast-copy of the IPC stream.
-
-    '''
-    async with stream.subscribe() as bcaster:
-        task_status.started()
-        ticks: list[int] = []
-        async for tick in bcaster:
-            print(f'{name}: rx {tick}')
-            ticks.append(tick)
-        # EVERY subscriber gets its own full copy B)
-        print(f'{name}: stream ended, got {ticks}')
-
-
-async def main() -> None:
-    async with tractor.open_nursery() as an:
-        portal = await an.start_actor(
-            'ticker',
-            enable_modules=[__name__],
-        )
-        async with (
-            portal.open_context(
-                tick_stream,
-                count=5,
-            ) as (ctx, first),
-            ctx.open_stream() as stream,
-        ):
-            assert first == 5
-            async with trio.open_nursery() as tn:
-                # use `.start()` so each consumer is known
-                # to be subscribed before the ticks flow.
-                for i in range(3):
-                    await tn.start(
-                        consume,
-                        f'sub_{i}',
-                        stream,
-                    )
-                await stream.send('go')
-        await portal.cancel_actor()
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/typed_payloads.py

@@ -1,85 +0,0 @@
-'''
-Demonstrate "typed messaging": applying a `msgspec.Struct`
-payload-type-spec to an IPC context via
-`@tractor.context(pld_spec=...)`.
-
-The child's `ctx.started()` value is stringently (round-trip)
-validated against the spec *on the send side*, so a mistyped
-payload raises a `tractor.MsgTypeError` before it ever hits
-the wire; stream payloads are checked on `receive()` and
-decode natively to the struct type.
-
-'''
-from msgspec import Struct
-
-import trio
-import tractor
-
-
-class Point(Struct):
-    '''
-    A simple 2D-coordinate msg-payload type.
-
-    '''
-    x: int
-    y: int
-
-
-@tractor.context(pld_spec=Point|None)
-async def point_doubler(
-    ctx: tractor.Context,
-) -> None:
-    '''
-    Stream back each received `Point` with doubled fields.
-
-    '''
-    # deliberately send a non-`Point` as our started-value;
-    # the send-side pld-spec validation catches it locally
-    # BEFORE anything is shipped over IPC.
-    try:
-        await ctx.started('this is no Point..')
-    except tractor.MsgTypeError:
-        print(
-            'child: just as planned, a `str` payload failed '
-            'the `Point|None` pld-spec B)'
-        )
-    # now do it right; the parent receives this as the 2nd
-    # element of its `.open_context()` entry tuple.
-    await ctx.started(Point(x=0, y=0))
-    async with ctx.open_stream() as stream:
-        async for pt in stream:
-            # natively decoded to our struct type!
-            assert type(pt) is Point
-            await stream.send(
-                Point(
-                    x=pt.x * 2,
-                    y=pt.y * 2,
-                )
-            )
-
-
-async def main() -> None:
-    async with tractor.open_nursery() as an:
-        portal = await an.start_actor(
-            'point_doubler',
-            enable_modules=[__name__],
-        )
-        async with (
-            portal.open_context(
-                point_doubler,
-            ) as (ctx, first),
-            ctx.open_stream() as stream,
-        ):
-            # the (validated) started-value from the child
-            assert first == Point(x=0, y=0)
-            for i in range(3):
-                await stream.send(Point(x=i, y=i))
-                doubled: Point = await stream.receive()
-                assert doubled == Point(x=i * 2, y=i * 2)
-                print(f'parent: rx {doubled}')
-        # explicitly teardown the daemon-actor
-        await portal.cancel_actor()
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/uds_transport_actor_tree.py

@@ -1,58 +0,0 @@
-'''
-Demonstrate an actor tree which talks over unix-domain-socket
-(UDS) transport instead of the default TCP: pass
-`enable_transports=['uds']` when opening the root and every
-subactor inherits the preference.
-
-Every channel address is a filesystem socket path (no TCP port
-in sight!) and, as a kernel-provided bonus, the peer's pid is
-exchanged for free via `SO_PEERCRED`.
-
-'''
-import os
-
-import trio
-import tractor
-
-
-async def report_addr() -> str:
-    '''
-    Return this actor's own accept (bind) addr + pid.
-
-    '''
-    actor = tractor.current_actor()
-    addr: tuple = actor.accept_addr
-    pid: int = os.getpid()
-    return f'{actor.name}@{addr} pid={pid}'
-
-
-async def main() -> None:
-    async with tractor.open_nursery(
-        enable_transports=['uds'],
-    ) as an:
-        portal = await an.start_actor(
-            'uds_child',
-            enable_modules=[__name__],
-        )
-        # the channel's remote addr is a `UDSAddress`: a
-        # filesystem socket path, NOT a (host, port) pair!
-        raddr = portal.chan.raddr
-        assert raddr.proto_key == 'uds'
-        # NOTE, `.sockpath` is the *shared listener* socket file
-        # (named for the root registrar) this channel rode in
-        # on, NOT a per-child path; the child-specific identity
-        # we get for free is the kernel-reported peer pid (via
-        # `SO_PEERCRED`).
-        print(
-            f'portal chan tpt proto: {raddr.proto_key!r}\n'
-            f'listener sock file: {raddr.sockpath}\n'
-            f'kernel-reported peer pid: {raddr.maybe_pid}\n'
-        )
-        # ask the child for its OWN distinct bind addr: another
-        # socket-file path under the runtime dir.
-        print(f'child says: {await portal.run(report_addr)}')
-        await portal.cancel_actor()
-
-
-if __name__ == '__main__':
-    trio.run(main)

flake.nix

@@ -25,63 +25,43 @@
           cpython = "python313";
           venv_dir = "py313";
           pypkgs = pkgs."${cpython}Packages";
-
-          # shared base toolchain for every dev-shell variant;
-          # extra-tooling shells (eg. `docs`, below) extend it
-          # so heavy/niche deps stay OUT of the `default` shell.
-          basePkgs = [
-            # XXX, ensure sh completions activate!
-            pkgs.bashInteractive
-            pkgs.bash-completion
-
-            # XXX, on nix(os), use pkgs version to avoid
-            # build/sys-sh-integration issues
-            pkgs.ruff
-
-            pkgs.uv
-            pkgs.${cpython}# ?TODO^ how to set from `cpython` above?
-          ];
-
-          baseHook = ''
-            # unmask to debug **this** dev-shell-hook
-            # set -e
-
-            # link-in c++ stdlib for various AOT-ext-pkgs (numpy, etc.)
-            LD_LIBRARY_PATH="${pkgs.stdenv.cc.cc.lib}/lib:$LD_LIBRARY_PATH"
-
-            export LD_LIBRARY_PATH
-
-            # RUNTIME-SETTINGS
-            # ------ uv ------
-            # - always use the ./py313/ venv-subdir
-            # - sync env with all extras
-            export UV_PROJECT_ENVIRONMENT=${venv_dir}
-            uv sync --dev --all-extras
-
-            # ------ TIPS ------
-            # NOTE, to launch the py-venv installed `xonsh` (like @goodboy)
-            # run the `nix develop` cmd with,
-            # >> nix develop -c uv run xonsh
-          '';
         in
         {
           default = pkgs.mkShell {
-            packages = basePkgs;
-            shellHook = baseHook;
-          };
 
-          # OPT-IN docs shell: `default` + the `d2` diagram
-          # renderer, kept OUT of `default` so casual dev shells
-          # don't pull it in. Enter with,
-          #   >> nix develop .#docs
-          # then build (the `.. d2::` directive auto-detects the
-          # `d2` bin now on PATH; see `docs/_ext/d2diagrams.py`),
-          #   >> uv run --group docs make -C docs html
-          docs = pkgs.mkShell {
-            packages = basePkgs ++ [ pkgs.d2 ];
-            shellHook = baseHook + ''
-              echo "[docs] d2 $(d2 --version) on PATH \
-              — build via: uv run --group docs make -C docs html"
+            packages = [
+              # XXX, ensure sh completions activate!
+              pkgs.bashInteractive
+              pkgs.bash-completion
+
+              # XXX, on nix(os), use pkgs version to avoid
+              # build/sys-sh-integration issues
+              pkgs.ruff
+
+              pkgs.uv
+              pkgs.${cpython}# ?TODO^ how to set from `cpython` above?
+            ];
+
+            shellHook = ''
+              # unmask to debug **this** dev-shell-hook
+              # set -e
+
+              # link-in c++ stdlib for various AOT-ext-pkgs (numpy, etc.)
+              LD_LIBRARY_PATH="${pkgs.stdenv.cc.cc.lib}/lib:$LD_LIBRARY_PATH"
+
+              export LD_LIBRARY_PATH
+
+              # RUNTIME-SETTINGS
+              # ------ uv ------
+              # - always use the ./py313/ venv-subdir
+              # - sync env with all extras
+              export UV_PROJECT_ENVIRONMENT=${venv_dir}
+              uv sync --dev --all-extras
+
+              # ------ TIPS ------
+              # NOTE, to launch the py-venv installed `xonsh` (like @goodboy)
+              # run the `nix develop` cmd with,
+              # >> nix develop -c uv run xonsh
             '';
           };
         }

notes_to_self/howtodocs.md

@@ -1,164 +0,0 @@
-# How to build + view the docs
-
-The site is `sphinx` + `pydata-sphinx-theme`, with diagrams in
-[`d2`](https://d2lang.com) (our local `.. d2::` directive) and
-*every* code block `literalinclude`-d straight from `examples/`
-(never copy-pasted — what you read is what CI runs).
-
-## TL;DR
-
-```
-uv run --group docs make -C docs html
-firefox docs/_build/html/index.html
-```
-
-## Nix users
-
-`d2` (the diagram renderer) is deliberately kept **out** of the
-default dev-shell so casual envs stay lean; it lives in an opt-in
-`docs` shell:
-
-```
-# enter the docs shell (puts `d2`, `uv` + python on PATH)
-nix develop .#docs
-
-# ...then build (diagrams re-render from docs/diagrams/*.d2)
-uv run --group docs make -C docs html
-```
-
-one-shot, without staying in the shell:
-
-```
-nix develop .#docs -c uv run --group docs make -C docs html
-```
-
-## Live-reload while editing
-
-Rebuilds + refreshes the browser on every save:
-
-```
-nix develop .#docs -c uv run --with sphinx-autobuild \
-    --group docs sphinx-autobuild docs docs/_build/html \
-    --watch examples
-# then open http://127.0.0.1:8000
-```
-
-The `--watch examples` is what makes edits to ``literalinclude``-d
-example scripts live-reload too: those files live *outside* `docs/`,
-so autobuild won't notice them changing without it.
-
-## Share it on your LAN
-
-To let someone on your subnet view the docs, bind the server to
-all interfaces (`--host 0.0.0.0`) instead of just localhost, then
-hand them `http://<your-lan-ip>:8000`.
-
-Live-reload, LAN-visible:
-
-```
-nix develop .#docs -c uv run --with sphinx-autobuild --group docs \
-    sphinx-autobuild docs docs/_build/html --host 0.0.0.0 --port 8000 \
-    --watch examples
-```
-
-Or just statically serve an already-built `docs/_build/html` (no
-rebuild-on-save):
-
-```
-python -m http.server -d docs/_build/html --bind 0.0.0.0 8000
-```
-
-Find the IP to give them (first one is usually your LAN iface):
-
-```
-hostname -I
-```
-
-> Heads-up: this is an unauthenticated static server bound to
-> every interface — fine on a trusted LAN, but don't leave it
-> running on an untrusted/public network.
-
-## Diagrams (`d2`)
-
-- `.d2` sources live in `docs/diagrams/`; their rendered SVGs are
-  git-committed under `docs/_diagrams/` as a fallback.
-- with a `d2` binary on `PATH` (the `.#docs` shell, or set
-  `D2_BIN='nix run nixpkgs#d2 --'`) any stale SVG re-renders at
-  build time.
-- with NO binary, the committed SVGs are served as-is, so CI and
-  casual builds need no `d2` at all.
-- a `.d2` that *fails to compile* is a hard build error under
-  `sphinx-build -W` (the last-good committed SVG is left intact).
-
-## Tweaking the logo
-
-The logo is plain SVG — colours are just editable text, so change
-them, save, and autobuild repaints the live page. Three contexts
-use it, coloured three different ways (an `<img>`-embedded svg
-can't read the page's CSS, so only the *inlined* hero can follow
-the live light/dark toggle):
-
-| context | file(s) | how it's coloured |
-|---|---|---|
-| **landing hero** | `docs/_static/tractor_logo_hero.html` (inlined into `index.rst`) + the `svg.hero-logo` rule in `docs/_static/css/custom.css` | linework is `fill: currentColor`, so it takes whatever `color:` the CSS sets — currently `var(--pst-color-text-base)` (the theme text colour). **← recolour on a whim by editing that one `color:` line.** |
-| **navbar** | `docs/_static/tractor_logo_nav_light.svg` + `…_nav_dark.svg`, wired via `html_theme_options["logo"]` in `docs/conf.py` | baked fills — near-black lines on light, near-white on dark; pydata swaps them by theme |
-| **README** | `docs/_static/tractor_logo_wire.svg` | one baked neutral-grey (GitHub/PyPI can't read the theme), with inline fills so it survives GitHub's svg sanitiser |
-
-The shape's "faces" are `fill: none` everywhere, so the page
-background shows through — that's the wireframe look. The original
-filled `tractor_logo_side.svg` is kept as the source to recolour
-from (and as the favicon).
-
-## svgtool: recolor + preview svgs
-
-`notes_to_self/svgtool.py` is a tiny helper for iterating on the
-logo (or any svg). It renders through headless firefox, so masks,
-`currentColor` and theme CSS look exactly like the built site.
-
-```
-# list the distinct colours in an svg
-python notes_to_self/svgtool.py colors docs/_static/tractor_logo_side.svg
-
-# write a recoloured copy (literal token swaps)
-python notes_to_self/svgtool.py recolor in.svg out.svg \
-    '#0A0A0A=currentColor' '#FCFCFB=none'
-
-# render an svg alone on a bg colour (reveals transparency)
-python notes_to_self/svgtool.py preview out.svg /tmp/p.png --bg '#ff00ff'
-
-# screenshot a BUILT page, forcing light/dark (see below)
-python notes_to_self/svgtool.py page docs/_build/html/index.html \
-    /tmp/dark.png --theme dark
-```
-
-### Why `page --theme dark`? (verifying dark mode headlessly)
-
-The non-obvious bit, for the sphinx-rusty:
-
-- pydata-sphinx-theme decides light-vs-dark **in the browser** at
-  page load, from a value saved in `localStorage` (or your OS
-  setting if you've never clicked the toggle).
-- a fresh headless screenshot starts with an *empty* `localStorage`,
-  so it always renders the default (light) — you could never grab
-  the dark variant.
-- `--theme dark` sidesteps that: it writes a throwaway copy of the
-  built HTML with a one-line injected `<script>` that pre-sets
-  `localStorage` (+ the `data-theme` attribute) to `dark`, then
-  screenshots that copy. pydata reads "dark" → renders dark.
-  (`--theme light` forces the other way.)
-
-So the loop for any theme-adaptive tweak is: build → `svgtool page
-<built-html> out.png --theme dark` → look. That's how the
-wireframe logo got checked in both modes without clicking a thing.
-
-## Keep it warning-free
-
-The build is currently 0-warning — keep it that way. `-W` turns
-any sphinx warning into a failure:
-
-```
-uv run --group docs sphinx-build -b html -W docs docs/_build/html
-```
-
-> The rendered version of this note lives in the contributor
-> guide: `docs/project/dev-tips.rst` → "Building these docs".

notes_to_self/svgtool.py

@@ -1,224 +0,0 @@
-#!/usr/bin/env python3
-'''
-svgtool — tiny SVG recolor + preview helper for fast logo
-tweaking. Rendering goes through headless firefox so CSS
-(masks, `prefers-color-scheme`, webfonts) is honored exactly
-like the real docs.
-
-Subcommands
------------
-  colors  SVG
-      list the distinct fill/stroke/stop colors in an svg.
-
-  recolor SVG OUT  old=new [old=new ...]
-      literal-replace color tokens, write OUT (great for
-      swapping `.stN{fill:#aaa}` style values or hex codes).
-
-  preview SVG OUT.png [--bg C] [--w N] [--scheme light|dark]
-      render an svg alone on a bg colour (default white, or
-      #1a1a1a under --scheme dark) to eyeball transparency +
-      shape. --scheme forces `prefers-color-scheme`.
-
-  page    URL_or_path OUT.png [--w N --h N] [--scheme light|dark]
-      screenshot a *built* html page (e.g. docs/_build/html/
-      index.html). --scheme dark|light forces the page's
-      color-scheme so a pydata `data-theme=auto` site renders
-      its dark/light variant — the way to verify theme-adaptive
-      logos without clicking the toggle.
-
-Examples
---------
-  svgtool.py colors docs/_static/tractor_logo_side.svg
-  svgtool.py recolor in.svg out.svg '#FCFCFB=none' '#0A0A0A=#fff'
-  svgtool.py preview out.svg /tmp/p.png --bg '#ff00ff' --w 600
-  svgtool.py page docs/_build/html/index.html /tmp/dark.png \
-      --w 1300 --h 900 --scheme dark
-'''
-from __future__ import annotations
-
-import argparse
-from pathlib import Path
-import re
-import subprocess as sp
-import tempfile
-
-FF: str = 'firefox'
-_color_re = re.compile(
-    r'(?:fill|stroke|stop-color)\s*[:=]\s*"?'
-    r'(#[0-9a-fA-F]{3,8}|none|transparent|currentColor)'
-)
-
-
-def _colors(text: str) -> list[str]:
-    return sorted(set(_color_re.findall(text)))
-
-
-def _profile(scheme: str|None) -> str:
-    '''
-    Spin up a throwaway firefox profile, optionally forcing
-    `prefers-color-scheme` via the content-override pref
-    (0 = dark, 1 = light).
-
-    '''
-    d: str = tempfile.mkdtemp(prefix='svgtool-ff-')
-    if scheme:
-        val: int = {'dark': 0, 'light': 1}[scheme]
-        Path(d, 'user.js').write_text(
-            f'user_pref('
-            f'"layout.css.prefers-color-scheme.content-override",'
-            f' {val});\n'
-        )
-    return d
-
-
-def _shot(
-    url: str,
-    out: str,
-    w: int,
-    h: int,
-    scheme: str|None,
-) -> None:
-    prof: str = _profile(scheme)
-    sp.run(
-        [
-            FF, '--headless', '--no-remote',
-            '-profile', prof,
-            '--screenshot', str(out),
-            f'--window-size={w},{h}',
-            url,
-        ],
-        stdout=sp.DEVNULL,
-        stderr=sp.DEVNULL,
-        timeout=90,
-    )
-    print(out)
-
-
-def cmd_colors(a: argparse.Namespace) -> None:
-    print('\n'.join(_colors(Path(a.svg).read_text())))
-
-
-def cmd_recolor(a: argparse.Namespace) -> None:
-    text: str = Path(a.svg).read_text()
-    for pair in a.pairs:
-        old, new = pair.split('=', 1)
-        if old not in text:
-            print(f'  ! {old!r} not found (skipped)')
-            continue
-        text = text.replace(old, new)
-    Path(a.out).write_text(text)
-    print(f'wrote {a.out}')
-
-
-def cmd_preview(a: argparse.Namespace) -> None:
-    bg: str = a.bg or (
-        '#1a1a1a' if a.scheme == 'dark' else '#ffffff'
-    )
-    src: str = Path(a.svg).resolve().as_uri()
-    html = Path(tempfile.mktemp(suffix='.html'))
-    html.write_text(
-        f'<!doctype html><html><body '
-        f'style="margin:0;background:{bg}">'
-        f'<img src="{src}" '
-        f'style="width:{a.w}px;display:block"></body></html>'
-    )
-    _shot(
-        html.resolve().as_uri(),
-        a.out,
-        a.w + 40,
-        int(a.w * 0.9),
-        a.scheme,
-    )
-
-
-# early script that pins a pydata-sphinx-theme page to a given
-# mode/theme (beats the localStorage/auto default) so headless
-# shots can verify theme-adaptive content without the toggle.
-_force_theme = (
-    '<script>try{{'
-    'localStorage.setItem("mode","{t}");'
-    'localStorage.setItem("theme","{t}");'
-    'document.documentElement.setAttribute("data-theme","{t}");'
-    'document.documentElement.setAttribute("data-mode","{t}");'
-    '}}catch(e){{}}</script>'
-)
-
-
-def cmd_page(a: argparse.Namespace) -> None:
-    src = Path(a.url)
-    if a.theme and src.exists():
-        # inject the force-theme script into a sibling temp copy
-        # (same dir → relative _static/ asset paths still resolve).
-        html: str = src.read_text()
-        inj: str = _force_theme.format(t=a.theme)
-        html = re.sub(
-            r'(<head[^>]*>)',
-            r'\1' + inj,
-            html,
-            count=1,
-        )
-        tmp = src.with_name(f'._svgtool_{a.theme}.html')
-        tmp.write_text(html)
-        try:
-            _shot(tmp.resolve().as_uri(), a.out, a.w, a.h, None)
-        finally:
-            tmp.unlink(missing_ok=True)
-        return
-    url: str = (
-        a.url
-        if '://' in a.url
-        else src.resolve().as_uri()
-    )
-    _shot(url, a.out, a.w, a.h, a.scheme)
-
-
-def main() -> None:
-    p = argparse.ArgumentParser(prog='svgtool.py')
-    sub = p.add_subparsers(required=True)
-
-    c = sub.add_parser('colors')
-    c.add_argument('svg')
-    c.set_defaults(fn=cmd_colors)
-
-    r = sub.add_parser('recolor')
-    r.add_argument('svg')
-    r.add_argument('out')
-    r.add_argument('pairs', nargs='+')
-    r.set_defaults(fn=cmd_recolor)
-
-    v = sub.add_parser('preview')
-    v.add_argument('svg')
-    v.add_argument('out')
-    v.add_argument('--bg', default=None)
-    v.add_argument('--w', type=int, default=600)
-    v.add_argument(
-        '--scheme',
-        choices=['light', 'dark'],
-        default=None,
-    )
-    v.set_defaults(fn=cmd_preview)
-
-    g = sub.add_parser('page')
-    g.add_argument('url')
-    g.add_argument('out')
-    g.add_argument('--w', type=int, default=1300)
-    g.add_argument('--h', type=int, default=900)
-    g.add_argument(
-        '--scheme',
-        choices=['light', 'dark'],
-        default=None,
-    )
-    g.add_argument(
-        '--theme',
-        choices=['light', 'dark'],
-        default=None,
-        help='force a pydata data-theme (toggle-accurate)',
-    )
-    g.set_defaults(fn=cmd_page)
-
-    a = p.parse_args()
-    a.fn(a)
-
-
-if __name__ == '__main__':
-    main()

pyproject.toml

@@ -118,19 +118,12 @@ eventfd = [
 subints = [
   "msgspec>=0.21.0",
 ]
-# docs generation; build locally via,
-#   uv run --group docs make -C docs html
-# diagrams re-render when a `d2` bin is found, see
-# `docs/_ext/d2diagrams.py` (eg. via `nix run
-# nixpkgs#d2` and the `D2_BIN` env var).
-docs = [
-  "sphinx>=9.1,<10",
-  "pydata-sphinx-theme>=0.18,<0.19",
-  "sphinx-design>=0.7,<0.8",
-  "sphinx-copybutton>=0.5.2,<0.6",
-  "sphinxext-opengraph>=0.13,<0.14",
-  "sphinx-togglebutton>=0.4.5,<0.5",
-]
+# TODO, add these with sane versions; were originally in
+# `requirements-docs.txt`..
+# docs = [
+#   "sphinx>="
+#   "sphinx_book_theme>="
+# ]
 # ------ dependency-groups ------
 
 [tool.uv.dependency-groups]

scripts/cpu-perf-check

@@ -1,170 +0,0 @@
-#!/usr/bin/env python3
-# tractor: distributed structured concurrency.
-# Copyright 2018-eternity Tyler Goodlet.
-#
-# SPDX-License-Identifier: AGPL-3.0-or-later
-'''
-`cpu-perf-check` — sustained-load CPU throttle detector.
-
-Idle freq snapshots LIE. A laptop can read
-`governor=performance`, `EPP=performance`,
-`platform_profile=performance`, `scaling_max_freq=<full>`
-and momentarily clock a P-core at 5GHz — while a
-firmware/EC power cap (AMD PPT/STAPM and friends) clamps
-the whole package to ~1.5GHz the instant a sustained
-multi-core load lands. That throttle masquerades as a
-`trio`-backend test *regression*: a wave of `fail_after` /
-`TooSlowError` / `Cancelled(source='deadline')` deadline
-misses on spawn-heavy tests, on byte-identical code that
-was green yesterday.
-
-The existing `tests/conftest.py:cpu_scaling_factor()` only
-reads STATIC `scaling_max_freq` vs `*_pstate_max_freq`, so
-it returns `1.0` (no throttle) during exactly this failure
-— it can't see the cap. This script complements it by
-BURNING every core for a few seconds and sampling the
-ACHIEVED `scaling_cur_freq`, which is the only thing that
-exposes the clamp.
-
-Exit code: `0` if sustained perf looks restored, `1` if
-throttled — so it gates a test run:
-
-    py313/bin/python scripts/cpu-perf-check && pytest tests/ ...
-
-Tunables (env-overridable):
-    CPU_PERF_SECS        load duration       (default 4.0)
-    CPU_PERF_HEALTHY_FRAC sustained/max floor (default 0.45)
-
-'''
-from __future__ import annotations
-import glob
-import os
-import time
-import multiprocessing as mp
-
-
-def _read(path: str) -> str | None:
-    try:
-        with open(path) as f:
-            return f.read().strip()
-    except OSError:
-        return None
-
-
-def _cur_freqs_mhz() -> list[int]:
-    out: list[int] = []
-    for f in glob.glob(
-        '/sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_cur_freq'
-    ):
-        if (v := _read(f)):
-            out.append(int(v) // 1000)
-    return out
-
-
-def _pkg_max_mhz() -> int:
-    '''
-    Highest per-core ceiling across the package — the
-    P-core max on hybrid parts.
-
-    '''
-    mxs: list[int] = []
-    for f in glob.glob(
-        '/sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_max_freq'
-    ):
-        if (v := _read(f)):
-            mxs.append(int(v) // 1000)
-    return max(mxs) if mxs else 0
-
-
-def _burn(stop: float) -> None:
-    # fixed-width (64-bit-masked) arithmetic keeps this a steady
-    # ALU load; an unmasked `x` grows ~x**2/iter into a huge bigint,
-    # degenerating into noisy alloc/mul-bound work (and needless
-    # memory) across N procs.
-    x: int = 1
-    while time.perf_counter() < stop:
-        x = (x + (x * x ^ 0x5)) & 0xFFFF_FFFF_FFFF_FFFF
-
-
-def main(
-    secs: float = float(os.environ.get('CPU_PERF_SECS', 4.0)),
-    # sustained aggregate must clear this fraction of the
-    # package max-freq ceiling. Throttled (~1.5GHz of 5.1GHz)
-    # ~= 0.29; a healthy all-core load easily clears 0.5.
-    healthy_frac: float = float(
-        os.environ.get('CPU_PERF_HEALTHY_FRAC', 0.45)
-    ),
-) -> int:
-    if not glob.glob('/sys/devices/system/cpu/cpu0/cpufreq'):
-        print('no cpufreq sysfs (non-linux?) — skipping, assume OK')
-        return 0
-
-    b: str = '/sys/devices/system/cpu/cpu0/cpufreq/'
-    pkg_max: int = _pkg_max_mhz()
-    print('=== static knobs (ALL can read fine while throttled) ===')
-    print(f'  governor          : {_read(b + "scaling_governor")}')
-    print(f'  EPP               : {_read(b + "energy_performance_preference")}')
-    print(f'  platform_profile  : '
-          f'{_read("/sys/firmware/acpi/platform_profile")}')
-    print(f'  pkg max freq      : {pkg_max} MHz')
-
-    ncpu: int = os.cpu_count() or 1
-    print(f'\n=== sustained {ncpu}-core load ({secs:.0f}s) — the real test ===')
-    stop: float = time.perf_counter() + secs
-    procs = [
-        mp.Process(target=_burn, args=(stop,), daemon=True)
-        for _ in range(ncpu)
-    ]
-    for p in procs:
-        p.start()
-
-    # skip the initial ~0.6s ramp, then sample steady-state.
-    # `try/finally` so a Ctrl-C / sampling error still reaps the
-    # burners instead of leaving stray CPU hogs (daemon=True is the
-    # backstop should we exit abnormally before the join).
-    samples: list[int] = []
-    try:
-        time.sleep(0.6)
-        while time.perf_counter() < stop - 0.2:
-            if (fr := _cur_freqs_mhz()):
-                samples.append(sum(fr) // len(fr))
-            time.sleep(0.3)
-    finally:
-        for p in procs:
-            p.terminate()
-        for p in procs:
-            p.join()
-
-    if not (samples and pkg_max):
-        print('  could not sample cur freq — assume OK')
-        return 0
-
-    sustained: int = sum(samples) // len(samples)
-    frac: float = sustained / pkg_max
-    print(f'  aggregate cur-freq samples: {samples}')
-    print(f'  sustained avg             : {sustained} MHz '
-          f'({frac * 100:.0f}% of {pkg_max} MHz max)')
-
-    if frac < healthy_frac:
-        print(
-            f'\n  ❌ THROTTLED — sustained {sustained}MHz is only '
-            f'{frac * 100:.0f}% of max (< {healthy_frac * 100:.0f}%).\n'
-            f'     Power cap (PPT/STAPM) still engaged. Fixes:\n'
-            f'       - bounce /sys/firmware/acpi/platform_profile\n'
-            f'         (balanced -> performance)\n'
-            f'       - unplug/replug USB-C to re-negotiate PD\n'
-            f'       - ryzenadj to lift STAPM/PPT\n'
-            f'       - else reboot\n'
-            f'     Do NOT bump test budgets — the box is slow, not the code.'
-        )
-        return 1
-
-    print(
-        f'\n  ✅ PERF OK — sustained {sustained}MHz holds '
-        f'{frac * 100:.0f}% of max. Cap looks lifted; safe to run tests.'
-    )
-    return 0
-
-
-if __name__ == '__main__':
-    raise SystemExit(main())

tests/conftest.py

@@ -134,150 +134,6 @@ def cpu_scaling_factor() -> float:
     return factor
 
 
-# session-cached sustained-load throttle multiplier — measured
-# once (lazily) on the first `cpu_perf_headroom()` call. `None`
-# = not-yet-measured.
-_sustained_headroom: float|None = None
-
-
-def _measure_sustained_headroom(
-    secs: float = 0.9,
-    # a healthy all-core sustained clock holds AT/ABOVE this
-    # fraction of the package single-core max ceiling (boost sags
-    # under full multi-core load even un-throttled, but not far);
-    # at/above it we assume no throttle and return 1.0.
-    throttle_gate: float = 0.6,
-    max_headroom: float = 4.,
-) -> float:
-    '''
-    One-shot all-core burn returning a latency multiplier
-    (>= 1.0) that reflects *sustained-load* CPU throttle.
-
-    Catches the firmware/EC power-cap clamp (AMD PPT/STAPM &
-    friends) that pins achieved `scaling_cur_freq` to a fraction
-    of the ceiling under multi-core load while EVERY static knob
-    (`governor`, `scaling_max_freq`, `EPP`, `platform_profile`)
-    still reads "full performance". That cap is INVISIBLE to
-    `cpu_scaling_factor()` and is the gremlin behind mass `trio`
-    deadline-miss failures on byte-identical code — see
-    `scripts/cpu-perf-check`.
-
-    Best-effort: returns 1.0 on non-linux / missing sysfs / any
-    error so it can never break a test run.
-
-    '''
-    import glob
-    import multiprocessing as mp
-
-    def _read_mhz(path: str) -> int|None:
-        try:
-            with open(path) as f:
-                return int(f.read()) // 1000
-        except OSError:
-            return None
-
-    try:
-        maxs: list[int] = [
-            v for f in glob.glob(
-                '/sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_max_freq'
-            )
-            if (v := _read_mhz(f)) is not None
-        ]
-        pkg_max: int = max(maxs) if maxs else 0
-        if not pkg_max:
-            return 1.
-
-        def _burn(stop: float) -> None:
-            # fixed-width (64-bit-masked) arithmetic keeps this a
-            # steady ALU load; an unmasked `x` grows ~x**2/iter into
-            # a huge bigint, degenerating into noisy alloc/mul-bound
-            # work (and needless memory) across N procs.
-            x: int = 1
-            while time.perf_counter() < stop:
-                x = (x + (x * x ^ 0x5)) & 0xFFFF_FFFF_FFFF_FFFF
-
-        # explicit `fork` ctx so we're immune to whatever global
-        # mp start-method tractor/the suite may have set (`spawn`
-        # would re-exec + re-import 24x — slow and pointless here).
-        ctx = mp.get_context('fork')
-        ncpu: int = os.cpu_count() or 1
-        stop: float = time.perf_counter() + secs
-        procs = [
-            ctx.Process(target=_burn, args=(stop,), daemon=True)
-            for _ in range(ncpu)
-        ]
-        for p in procs:
-            p.start()
-
-        # skip the ~0.4s boost window so we sample the steady
-        # state AFTER any power-cap has engaged.
-        samples: list[int] = []
-        time.sleep(0.4)
-        while time.perf_counter() < stop - 0.1:
-            curs: list[int] = [
-                v for f in glob.glob(
-                    '/sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_cur_freq'
-                )
-                if (v := _read_mhz(f)) is not None
-            ]
-            if curs:
-                samples.append(sum(curs) // len(curs))
-            time.sleep(0.15)
-        for p in procs:
-            p.join()
-
-        if not samples:
-            return 1.
-        frac: float = (sum(samples) // len(samples)) / pkg_max
-        # below the gate we read it as a power-cap throttle. The
-        # spawn/IPC/fork-bound work these budgets guard slows ~1:1
-        # with the achieved-vs-max freq ratio, so compensate by the
-        # FULL inverse fraction (a boost-discounted factor
-        # under-shoots and still trips the marginal cases).
-        if frac >= throttle_gate:
-            return 1.
-        # a 0/parked-core freq read would `ZeroDivisionError` the
-        # inverse below — silently swallowed by the outer `except`
-        # into a 1.0 (no-throttle), defeating the probe on exactly
-        # the broken box it should flag; read 0 as max throttle.
-        if frac <= 0:
-            return max_headroom
-        return min(max_headroom, 1. / frac)
-
-    except Exception:
-        return 1.
-
-
-def cpu_perf_headroom() -> float:
-    '''
-    Latency-headroom multiplier (>= 1.0) covering BOTH cpu-perf
-    throttle classes — multiply a test's deadline by it, e.g.
-    `timeout *= cpu_perf_headroom()`:
-
-      - static cpu-freq scaling — via `cpu_scaling_factor()`
-        (governor/policy lowered the `scaling_max_freq` ceiling).
-
-      - sustained-load power-cap throttle — via
-        `_measure_sustained_headroom()` (firmware/EC PPT/STAPM
-        clamps achieved freq under load while every static knob
-        reads "performance"; INVISIBLE to the static check). This
-        is the gremlin behind mass `trio` deadline-miss failures
-        on unchanged code — see
-        `ai/conc-anal/trio_033_cancel_cascade_slowdown_depth3_issue.md`.
-
-    The sustained probe runs ONCE per session (cached); the cost
-    is a ~0.9s all-core burn on first call only.
-
-    '''
-    global _sustained_headroom
-    static: float = cpu_scaling_factor()
-    if _non_linux:
-        return static
-    if _sustained_headroom is None:
-        _sustained_headroom = _measure_sustained_headroom()
-    return max(static, _sustained_headroom)
-
-
 # NOTE, the `--ll`/`--tl` CLI flags + the `loglevel`, `test_log`
 # and `testing_pkg_name` fixtures have been factored into the
 # `tractor._testing.pytest` plugin (loaded via the `-p` entry in

tests/devx/test_debugger.py

@@ -794,14 +794,6 @@ def test_multi_nested_subactors_error_through_nurseries(
         loglevel='pdb',
     )
     last_send_char: str|None = None
-
-    # inflate pexpect waits under CPU throttle — incl. the
-    # sustained-load power-cap invisible to static freq reads — so
-    # a slow-to-boot child REPL doesn't trip a false `TIMEOUT`.
-    # See `scripts/cpu-perf-check`.
-    from ..conftest import cpu_perf_headroom
-    headroom: float = cpu_perf_headroom()
-
     for (
         i,
         send_char,
@@ -825,9 +817,6 @@ def test_multi_nested_subactors_error_through_nurseries(
         if is_forking_spawner:
             timeout += 4
 
-        if headroom != 1.:
-            timeout *= headroom
-
         try:
             child.expect(
                 PROMPT,

tests/test_advanced_streaming.py

@@ -189,18 +189,11 @@ def test_dynamic_pub_sub(
     # sits forever until external SIGINT. The `afk_alarm_w_trace`
     # outer guard below is the AFK-safety counterpart (SIGALRM
     # raises in the main thread regardless of trio scope state).
-    fail_after_s: float = (
+    fail_after_s: int = (
         8
         if is_forking_spawner
         else 20
     )
-    # inflate under CPU throttle — incl. the sustained-load
-    # power-cap invisible to static freq reads — so a slow box
-    # doesn't trip the deadline. See `scripts/cpu-perf-check`.
-    from .conftest import cpu_perf_headroom
-    headroom: float = cpu_perf_headroom()
-    if headroom != 1.:
-        fail_after_s *= headroom
 
     async def main():
         # bug-class-3 breadcrumb: tag each level of the cancel path

tests/test_cancellation.py

@@ -596,15 +596,6 @@ async def test_nested_multierrors(
     # depth=3, BOTH variants will reliably `xpass` and
     # pytest will yell — our signal to drop the marker. See
     # `ai/conc-anal/cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`.
-    #
-    # Probe CPU throttle ONCE up-front (folds in the sustained-load
-    # power-cap that static freq reads miss): used BOTH to inflate
-    # the deadline budget below AND to xfail depth=3, whose failure
-    # mode under throttle is a runtime-internal reap deadline — not
-    # a test-budget miss. See `scripts/cpu-perf-check`.
-    from .conftest import cpu_perf_headroom
-    headroom: float = cpu_perf_headroom()
-
     if start_method == 'main_thread_forkserver':
         request.node.add_marker(
             pytest.mark.xfail(
@@ -618,34 +609,6 @@ async def test_nested_multierrors(
             )
         )
 
-    # Under CPU throttle (incl. the sustained-load power-cap that
-    # static freq reads miss) the DEEP depth=3 tree trips tractor's
-    # INTERNAL reap deadlines (`soft_kill`/`hard_kill`
-    # `move_on_after`/`terminate_after=1.6`) before slow subprocs
-    # exit, injecting a `Cancelled(source='deadline')` into the BEG
-    # — the SAME shape-mismatch class as the MTF xfail above, and
-    # NOT fixable by inflating the test-level budget (the Cancelled
-    # is minted inside the runtime, not by our `fail_after`).
-    # xfail(strict=False) so it auto-clears the moment the box is
-    # un-throttled (`headroom == 1.`); depth=1's shallow tree stays
-    # under those internal deadlines so it just rides the budget
-    # inflation below. See `scripts/cpu-perf-check`.
-    elif (
-        depth == 3
-        and
-        headroom != 1.
-    ):
-        request.node.add_marker(
-            pytest.mark.xfail(
-                strict=False,
-                reason=(
-                    'CPU throttled — tractor reap deadline injects '
-                    'Cancelled into BEG; see conc-anal/'
-                    'trio_033_cancel_cascade_slowdown_depth3_issue.md'
-                ),
-            )
-        )
-
     # Per-backend/-depth budgets: in the non-hang case the
     # whole spawn + cancel-cascade should complete in well
     # under these. On the borderline hang case the
@@ -673,14 +636,11 @@ async def test_nested_multierrors(
         case ('main_thread_forkserver', 3):
             timeout = 30
 
-    # inflate the budget by the throttle headroom probed above so
-    # a slow box doesn't masquerade as a deadline regression.
-    # NOTE, `headroom = cpu_perf_headroom()` (set above) is the
-    # SUPERSET of `cpu_scaling_factor()` — it folds in the static
-    # cpu-freq scaling + slow-CI bump AND the sustained-load
-    # throttle probe this depth-3 cascade was the poster child for.
-    if headroom != 1.:
-        timeout *= headroom
+    # headroom for CPU-freq scaling AND/OR slow CI so the inner
+    # snapshot-capturing budget doesn't fire spuriously on a
+    # sluggish runner; see `cpu_scaling_factor()`.
+    from .conftest import cpu_scaling_factor
+    timeout *= cpu_scaling_factor()
 
     async with fail_after_w_trace(timeout):
         try:
@@ -788,7 +748,7 @@ def test_cancel_via_SIGINT_other_task(
     started from a seperate ``trio`` child  task.
 
     '''
-    from .conftest import cpu_perf_headroom
+    from .conftest import cpu_scaling_factor
 
     pid: int = os.getpid()
     timeout: float = (
@@ -798,9 +758,8 @@ def test_cancel_via_SIGINT_other_task(
     if _friggin_windows:  # smh
         timeout += 1
 
-    # latency headroom for static cpu-freq scaling + sustained-load
-    # throttle + CI (auto-cpufreq et al.); see `cpu_perf_headroom()`.
-    headroom: float = cpu_perf_headroom()
+    # add latency headroom for CPU freq scaling (auto-cpufreq et al.)
+    headroom: float = cpu_scaling_factor()
     if headroom != 1.:
         timeout *= headroom
 
@@ -1003,11 +962,11 @@ def test_fast_graceful_cancel_when_spawn_task_in_soft_proc_wait_for_daemon(
     if _friggin_windows:  # smh
         timeout += 1
 
-    # CPU-scaling / sustained-throttle / CI latency headroom — macOS
-    # CI especially is slow for this graceful-vs-hard-reap timing
-    # race; see `cpu_perf_headroom()`.
-    from .conftest import cpu_perf_headroom
-    timeout *= cpu_perf_headroom()
+    # CPU-scaling / CI latency headroom — macOS CI especially is
+    # slow for this graceful-vs-hard-reap timing race; see
+    # `cpu_scaling_factor()`.
+    from .conftest import cpu_scaling_factor
+    timeout *= cpu_scaling_factor()
 
     async def main():
         start = time.time()

tests/test_clustering.py

@@ -24,14 +24,8 @@ def test_empty_mngrs_input_raises(
             'actor-cluster teardown hangs intermittently on UDS'
         )
 
-    # inflate under CPU throttle — incl. the sustained-load
-    # power-cap invisible to static freq reads. See
-    # `scripts/cpu-perf-check`.
-    from .conftest import cpu_perf_headroom
-    fail_after_s: float = 3 * cpu_perf_headroom()
-
     async def main():
-        with trio.fail_after(fail_after_s):
+        with trio.fail_after(3):
             async with (
                 open_actor_cluster(
                     modules=[__name__],
@@ -99,13 +93,6 @@ async def test_streaming_to_actor_cluster(
         10 if is_forking_spawner
         else 6
     )
-    # inflate under CPU throttle — incl. the sustained-load
-    # power-cap invisible to static freq reads. See
-    # `scripts/cpu-perf-check`.
-    from .conftest import cpu_perf_headroom
-    headroom: float = cpu_perf_headroom()
-    if headroom != 1.:
-        delay *= headroom
     with trio.fail_after(delay):
         async with (
             open_actor_cluster(modules=[__name__]) as portals,

tests/test_docs_examples.py

@@ -145,22 +145,7 @@ def test_example(
             'This test does run just fine "in person" however..'
         )
 
-    if (
-        'uds_transport_actor_tree' in ex_file
-        and
-        _friggin_macos
-        and
-        ci_env
-    ):
-        pytest.skip(
-            'UDS-transport example reliably fails on macOS CI.\n'
-            'UDS-on-macOS is otherwise un-exercised by the matrix\n'
-            '(no `tpt_proto=uds` macOS job), so this new example is\n'
-            'the first to surface it; the macOS UDS path needs\n'
-            'root-causing. Passes on Linux.'
-        )
-
-    from .conftest import cpu_perf_headroom
+    from .conftest import cpu_scaling_factor
 
     timeout: float = (
         60
@@ -168,9 +153,8 @@ def test_example(
         else 16
     )
 
-    # add latency headroom for CPU freq scaling/throttle
-    # (auto-cpufreq et al.)
-    headroom: float = cpu_perf_headroom()
+    # add latency headroom for CPU freq scaling (auto-cpufreq et al.)
+    headroom: float = cpu_scaling_factor()
     if headroom != 1.:
         timeout *= headroom
 

tests/test_inter_peer_cancellation.py

@@ -24,7 +24,7 @@ from tractor._testing import (
     expect_ctxc,
 )
 
-from .conftest import cpu_perf_headroom
+from .conftest import cpu_scaling_factor
 
 pytestmark = [
     pytest.mark.skipon_spawn_backend(
@@ -1280,12 +1280,12 @@ def test_peer_spawns_and_cancels_service_subactor(
 
 
     async def _main():
-        headroom: float = cpu_perf_headroom()
+        headroom: float = cpu_scaling_factor()
         this_fast_on_linux: float = 3
         this_fast = this_fast_on_linux * headroom
         if headroom != 1.:
             test_log.warning(
-                f'Adding latency headroom on linux bc CPU perf scaling/throttle,\n'
+                f'Adding latency headroom on linux bc CPU scaling,\n'
                 f'headroom: {headroom}\n'
                 f'this_fast_on_linux: {this_fast_on_linux} -> {this_fast}\n'
             )

tests/test_legacy_one_way_streaming.py

@@ -326,11 +326,11 @@ def time_quad_ex(
     ):
         timeout += 1
 
-    # inflate the cancel-deadline for static cpu-freq scaling +
-    # sustained-load throttle + CI latency (see `cpu_perf_headroom()`)
-    # so the example isn't cancelled mid-stream on a throttled/CI box.
-    from .conftest import cpu_perf_headroom
-    timeout *= cpu_perf_headroom()
+    # inflate the cancel-deadline for CPU-freq scaling AND/OR CI
+    # latency (see `cpu_scaling_factor()`) so the example isn't
+    # cancelled mid-stream on a throttled/CI runner.
+    from .conftest import cpu_scaling_factor
+    timeout *= cpu_scaling_factor()
 
     start: float = time.time()
     results: list[int] = trio.run(partial(
@@ -379,8 +379,8 @@ def test_a_quadruple_example(
     # https://github.com/AdnanHodzic/auto-cpufreq?tab=readme-ov-file#example-config-file-contents
     #
     # HENCE this below latency-headroom compensation logic..
-    from .conftest import cpu_perf_headroom
-    headroom: float = cpu_perf_headroom()
+    from .conftest import cpu_scaling_factor
+    headroom: float = cpu_scaling_factor()
     if headroom != 1.:
         this_fast = this_fast_on_linux * headroom
         test_log.warning(

tests/test_resource_cache.py

@@ -213,12 +213,12 @@ def test_open_local_sub_to_stream(
     N local tasks using `trionics.maybe_open_context()`.
 
     '''
-    from .conftest import cpu_perf_headroom
+    from .conftest import cpu_scaling_factor
     timeout: float = (
         4
         if not platform.system() == "Windows"
         else 10
-    ) * cpu_perf_headroom()
+    ) * cpu_scaling_factor()
 
     if debug_mode:
         timeout = 999

tests/test_spawning.py

@@ -153,9 +153,9 @@ async def test_most_beautiful_word(
     # actor spawn + IPC round-trip is comfortably sub-second on a
     # warm box, but slow/noisy CI runners (esp. macOS) blow a flat
     # 1s deadline. Scale for CI/CPU-throttle headroom — `== 1s`
-    # locally where `cpu_perf_headroom()` is `1.0`.
-    from .conftest import cpu_perf_headroom
-    with trio.fail_after(1 * cpu_perf_headroom()):
+    # locally where `cpu_scaling_factor()` is `1.0`.
+    from .conftest import cpu_scaling_factor
+    with trio.fail_after(1 * cpu_scaling_factor()):
         async with tractor.open_nursery(
             debug_mode=debug_mode,
         ) as an:

tractor/_context.py

@@ -135,21 +135,19 @@ class Context:
     communication context.
 
     (We've also considered other names and ideas:
+     - "communicating tasks scope": cts
+     - "distributed task scope": dts
+     - "communicating tasks context": ctc
 
-    - "communicating tasks scope": cts
-    - "distributed task scope": dts
-    - "communicating tasks context": ctc
-
-    **Got a better idea for naming? Make an issue dawg!**
+     **Got a better idea for naming? Make an issue dawg!**
     )
 
     NB: This class should **never be instatiated directly**, it is
     allocated by the runtime in 2 ways:
-
-    - by entering `Portal.open_context()` which is the primary
-      public API for any "parent" task or,
-    - by the RPC machinery's `._rpc._invoke()` as a `ctx` arg
-      to a remotely scheduled "child" function.
+     - by entering `Portal.open_context()` which is the primary
+       public API for any "parent" task or,
+     - by the RPC machinery's `._rpc._invoke()` as a `ctx` arg
+       to a remotely scheduled "child" function.
 
     AND is always constructed using the below `mk_context()`.
 
@@ -445,7 +443,6 @@ class Context:
         '''
         Records whether cancellation has been requested for this context
         by a call to  `.cancel()` either due to,
-
         - an explicit call by some local task,
         - or an implicit call due to an error caught inside
           the `Portal.open_context()` block.
@@ -557,7 +554,6 @@ class Context:
         Only as an FYI, in the "child" side case it can also be
         set but never is readable by any task outside the RPC
         machinery in `._invoke()` since,:
-
         - when a child side calls `.cancel()`, `._scope.cancel()`
           is called immediately and handled specially inside
           `._invoke()` to raise a `ContextCancelled` which is then
@@ -1037,8 +1033,8 @@ class Context:
         `._scope.cancel()` and delivering an `ContextCancelled`
         ack msg in reponse.
 
-        **Behaviour:**
-
+        Behaviour:
+        ---------
         - after the far end cancels, the `.cancel()` calling side
           should receive a `ContextCancelled` with the
           `.canceller: tuple` uid set to the current `Actor.aid.uid`.
@@ -1509,8 +1505,7 @@ class Context:
         TODO->( this is doc-driven-dev content not yet actual ;P )
 
         The final "outcome" from an IPC context which can be any of:
-
-        - some `outcome.Value` which boxes the returned output from the peer task's
+        - some `outcome.Value` which boxes the returned output from the peer task's 
           `@context`-decorated remote task-as-func, or
         - an `outcome.Error` wrapping an exception raised that same RPC task
           after a fault or cancellation, or
@@ -2071,7 +2066,7 @@ async def open_context_from_portal(
     allows for deterministic setup and teardown of a remotely
     scheduled task in another remote actor. Once opened, the 2 now
     "linked" tasks run completely in parallel in each actor's
-    runtime with their enclosing `trio.CancelScope`\\ s kept in
+    runtime with their enclosing `trio.CancelScope`s kept in
     a synced state wherein if either side errors or cancels an
     equivalent error is relayed to the other side via an SC-compat
     IPC protocol.

tractor/_exceptions.py

@@ -823,13 +823,12 @@ class ContextCancelled(RemoteActorError):
 
         - (simulating) an IPC transport network outage
         - a (malicious) pkt sent specifically to cancel an actor's
-          runtime non-gracefully without ensuring ongoing RPC tasks are
-          incrementally cancelled as is done with::
-
-              `Actor`
-              |_`.cancel()`
-              |_`.cancel_soon()`
-              |_`._cancel_task()`
+          runtime non-gracefully without ensuring ongoing RPC tasks are 
+          incrementally cancelled as is done with:
+          `Actor`
+          |_`.cancel()`
+          |_`.cancel_soon()`
+          |_`._cancel_task()`
 
         '''
         value: tuple[str, str]|None = self._ipc_msg.canceller

tractor/_testing/addr.py

@@ -50,14 +50,9 @@ def get_rando_addr(
     fight over the bind, cascading into a chain of
     "Address already in use" failures.
 
-    For UDS the *cross*-process concern is handled by keying
-    socket paths off `os.getpid()` (each pytest process gets its
-    own namespace). *Within* a process — where `get_random()` has
-    no live runtime to name from — it also appends a per-call
-    `uuid4` token, so two calls (e.g. a `reg_addr` + a distinct
-    bind addr in one test body) yield distinct sockpaths rather
-    than aliasing to the same `name@pid.sock` and tripping
-    `EADDRINUSE`.
+    For UDS this concern doesn't apply: `UDSAddress.get_random()`
+    already builds socket paths from `os.getpid()` so each
+    pytest process gets its own socket-path namespace.
 
     '''
     addr_type: Type[_addr.Addres] = _addr._address_types[tpt_proto]

tractor/devx/debug/_post_mortem.py

@@ -321,7 +321,6 @@ def open_crash_handler(
     `typer` users so they can quickly wrap cmd endpoints which get
     automatically wrapped to use the runtime's `debug_mode: bool`
     AND `pdbp.pm()` around any code that is PRE-runtime entry
-
     - any sync code which runs BEFORE the main call to
       `trio.run()`.
 

tractor/devx/debug/_repl.py

@@ -187,7 +187,7 @@ def mk_pdb() -> PdbREPL:
 
     FURTHER, the `pdbp.Pdb` instance is configured to be `trio`
     "compatible" from a SIGINT handling perspective; we mask out
-    the default `pdb` handler and instead apply `trio`\\ s default
+    the default `pdb` handler and instead apply `trio`s default
     which mostly addresses all issues described in:
 
      - https://github.com/python-trio/trio/issues/1155

tractor/discovery/_api.py

@@ -253,7 +253,6 @@ async def query_actor(
     listening @ `regaddr`.
 
     Yields a `tuple` of `(addr, reg_portal)` where,
-
     - `addr` is the transport protocol (socket) address or `None` if
       no entry under that name exists,
     - `reg_portal` is the `Portal` (or `LocalPortal` when the
@@ -440,7 +439,7 @@ async def wait_for_actor(
 ) -> AsyncGenerator[Portal, None]:
     '''
     Wait on at least one peer actor to register `name` with the
-    registrar, yield a `Portal` to the first registree.
+    registrar, yield a `Portal to the first registree.
 
     '''
     actor: Actor = current_actor()