Merge pull request #375 from goodboy/structural_dynamics_of_flow

The Structural Dynamics of Flow: finally a formalized modular transport layer -> `tractor.ipc` 😎

.github/workflows/ci.yml

@@ -8,46 +8,70 @@ on:
   workflow_dispatch:
 
 jobs:
-
-  mypy:
-    name: 'MyPy'
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Setup python
-        uses: actions/setup-python@v2
-        with:
-          python-version: '3.11'
-
-      - name: Install dependencies
-        run: pip install -U . --upgrade-strategy eager -r requirements-test.txt
-
-      - name: Run MyPy check
-        run: mypy tractor/ --ignore-missing-imports --show-traceback
-
+  # ------ sdist ------
   # test that we can generate a software distribution and install it
   # thus avoid missing file issues after packaging.
+  #
+  # -[x] produce sdist with uv
+  # ------ - ------
   sdist-linux:
     name: 'sdist'
     runs-on: ubuntu-latest
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
-      - name: Setup python
-        uses: actions/setup-python@v2
-        with:
-          python-version: '3.11'
+      - name: Install latest uv
+        uses: astral-sh/setup-uv@v6
 
-      - name: Build sdist
-        run: python setup.py sdist --formats=zip
+      - name: Build sdist as tar.gz
+        run: uv build --sdist --python=3.13
 
-      - name: Install sdist from .zips
-        run: python -m pip install dist/*.zip
+      - name: Install sdist from .tar.gz
+        run: python -m pip install dist/*.tar.gz
+
+  # ------ type-check ------
+  # mypy:
+  #   name: 'MyPy'
+  #   runs-on: ubuntu-latest
+
+  #   steps:
+  #     - name: Checkout
+  #       uses: actions/checkout@v4
+
+  #     - name: Install latest uv
+  #       uses: astral-sh/setup-uv@v6
+
+  #     # faster due to server caching?
+  #     # https://docs.astral.sh/uv/guides/integration/github/#setting-up-python
+  #     - name: "Set up Python"
+  #       uses: actions/setup-python@v6
+  #       with:
+  #         python-version-file: "pyproject.toml"
+
+  #     # w uv
+  #     # - name: Set up Python
+  #     #   run: uv python install
+
+  #     - name: Setup uv venv
+  #       run: uv venv .venv --python=3.13
+
+  #     - name: Install
+  #       run: uv sync --dev
+
+  #     # TODO, ty cmd over repo
+  #     # - name: type check with ty
+  #     #   run: ty ./tractor/
+
+  #     # - uses: actions/cache@v3
+  #     #     name: Cache uv virtenv as default .venv
+  #     #     with:
+  #     #       path: ./.venv
+  #     #       key: venv-${{ hashFiles('uv.lock') }}
+
+  #     - name: Run MyPy check
+  #       run: mypy tractor/ --ignore-missing-imports --show-traceback
 
 
   testing-linux:
@@ -59,32 +83,45 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python: ['3.11']
+        python-version: ['3.13']
         spawn_backend: [
           'trio',
-          'mp_spawn',
-          'mp_forkserver',
+          # 'mp_spawn',
+          # 'mp_forkserver',
         ]
 
     steps:
 
-      - name: Checkout
-        uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - name: Setup python
-        uses: actions/setup-python@v2
+      - name: 'Install uv + py-${{ matrix.python-version }}'
+        uses: astral-sh/setup-uv@v6
         with:
-          python-version: '${{ matrix.python }}'
+          python-version: ${{ matrix.python-version }}
 
-      - name: Install dependencies
-        run: pip install -U . -r requirements-test.txt -r requirements-docs.txt --upgrade-strategy eager
+      # GH way.. faster?
+      # - name: setup-python@v6
+      #   uses: actions/setup-python@v6
+      #   with:
+      #     python-version: '${{ matrix.python-version }}'
 
-      - name: List dependencies
-        run: pip list
+      # consider caching for speedups?
+      # https://docs.astral.sh/uv/guides/integration/github/#caching
+
+      - name: Install the project w uv
+        run: uv sync --all-extras --dev
+
+      # - name: Install dependencies
+      #   run: pip install -U . -r requirements-test.txt -r requirements-docs.txt --upgrade-strategy eager
+
+      - name: List deps tree
+        run: uv tree
 
       - name: Run tests
-        run: pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rsx
+        run: uv run pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rsx
 
+  # XXX legacy NOTE XXX
+  #
   # We skip 3.10 on windows for now due to not having any collabs to
   # debug the CI failures. Anyone wanting to hack and solve them is very
   # welcome, but our primary user base is not using that OS.

default.nix

@@ -0,0 +1,19 @@
+{ pkgs ? import <nixpkgs> {} }:
+let
+  nativeBuildInputs = with pkgs; [
+    stdenv.cc.cc.lib
+    uv
+  ];
+
+in
+pkgs.mkShell {
+  inherit nativeBuildInputs;
+
+  LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath nativeBuildInputs;
+  TMPDIR = "/tmp";
+
+  shellHook = ''
+    set -e
+    uv venv .venv --python=3.12
+  '';
+}

docs/README.rst

@@ -689,9 +689,11 @@ channel`_!
 .. _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
 
-
-.. |gh_actions| image:: https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2Fgoodboy%2Ftractor%2Fbadge&style=popout-square
-    :target: https://actions-badge.atrox.dev/goodboy/tractor/goto
+..
+   NOTE, on generating badge links from the UI
+   https://docs.github.com/en/actions/how-tos/monitoring-and-troubleshooting-workflows/monitoring-workflows/adding-a-workflow-status-badge?ref=gitguardian-blog-automated-secrets-detection#using-the-ui
+.. |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://readthedocs.org/projects/tractor/badge/?version=latest
     :target: https://tractor.readthedocs.io/en/latest/?badge=latest

examples/debugging/restore_builtin_breakpoint.py

@@ -4,6 +4,11 @@ import sys
 import trio
 import tractor
 
+# ensure mod-path is correct!
+from tractor.devx._debug import (
+    _sync_pause_from_builtin as _sync_pause_from_builtin,
+)
+
 
 async def main() -> None:
 
@@ -13,6 +18,7 @@ async def main() -> None:
 
     async with tractor.open_nursery(
         debug_mode=True,
+        loglevel='devx',
     ) as an:
         assert an
         assert (

examples/service_discovery.py

@@ -9,7 +9,7 @@ async def main(service_name):
     async with tractor.open_nursery() as an:
         await an.start_actor(service_name)
 
-        async with tractor.get_registry('127.0.0.1', 1616) as portal:
+        async with tractor.get_registry() as portal:
             print(f"Arbiter is listening on {portal.channel}")
 
         async with tractor.wait_for_actor(service_name) as sockaddr:

pyproject.toml

@@ -45,6 +45,8 @@ dependencies = [
   "pdbp>=1.6,<2", # windows only (from `pdbp`)
   # typed IPC msging
   "msgspec>=0.19.0",
+  "cffi>=1.17.1",
+  "bidict>=0.23.1",
 ]
 
 # ------ project ------
@@ -59,9 +61,12 @@ dev = [
   # `tractor.devx` tooling
   "greenback>=1.2.1,<2",
   "stackscope>=0.2.2,<0.3",
+  # ^ requires this?
+  "typing-extensions>=4.14.1",
   "pyperclip>=1.9.0",
   "prompt-toolkit>=3.0.50",
   "xonsh>=0.19.2",
+  "psutil>=7.0.0",
 ]
 # TODO, add these with sane versions; were originally in
 # `requirements-docs.txt`..

tests/test_discovery.py

@@ -26,7 +26,7 @@ async def test_reg_then_unreg(reg_addr):
         portal = await n.start_actor('actor', enable_modules=[__name__])
         uid = portal.channel.uid
 
-        async with tractor.get_registry(*reg_addr) as aportal:
+        async with tractor.get_registry(reg_addr) as aportal:
             # this local actor should be the arbiter
             assert actor is aportal.actor
 
@@ -160,7 +160,7 @@ async def spawn_and_check_registry(
     async with tractor.open_root_actor(
         registry_addrs=[reg_addr],
     ):
-        async with tractor.get_registry(*reg_addr) as portal:
+        async with tractor.get_registry(reg_addr) as portal:
             # runtime needs to be up to call this
             actor = tractor.current_actor()
 
@@ -300,7 +300,7 @@ async def close_chans_before_nursery(
     async with tractor.open_root_actor(
         registry_addrs=[reg_addr],
     ):
-        async with tractor.get_registry(*reg_addr) as aportal:
+        async with tractor.get_registry(reg_addr) as aportal:
             try:
                 get_reg = partial(unpack_reg, aportal)
 

tests/test_docs_examples.py

@@ -66,6 +66,9 @@ def run_example_in_subproc(
         # due to backpressure!!!
         proc = testdir.popen(
             cmdargs,
+            stdin=subprocess.PIPE,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
             **kwargs,
         )
         assert not proc.returncode
@@ -119,10 +122,14 @@ def test_example(
         code = ex.read()
 
         with run_example_in_subproc(code) as proc:
-            proc.wait()
-            err, _ = proc.stderr.read(), proc.stdout.read()
-            # print(f'STDERR: {err}')
-            # print(f'STDOUT: {out}')
+            err = None
+            try:
+                if not proc.poll():
+                    _, err = proc.communicate(timeout=15)
+
+            except subprocess.TimeoutExpired as e:
+                proc.kill()
+                err = e.stderr
 
             # if we get some gnarly output let's aggregate and raise
             if err:

tests/test_inter_peer_cancellation.py

@@ -871,7 +871,7 @@ async def serve_subactors(
                 )
                 await ipc.send((
                     peer.chan.uid,
-                    peer.chan.raddr,
+                    peer.chan.raddr.unwrap(),
                 ))
 
         print('Spawner exiting spawn serve loop!')

tests/test_local.py

@@ -38,7 +38,7 @@ async def test_self_is_registered_localportal(reg_addr):
     "Verify waiting on the arbiter to register itself using a local portal."
     actor = tractor.current_actor()
     assert actor.is_arbiter
-    async with tractor.get_registry(*reg_addr) as portal:
+    async with tractor.get_registry(reg_addr) as portal:
         assert isinstance(portal, tractor._portal.LocalPortal)
 
         with trio.fail_after(0.2):

tests/test_multi_program.py

@@ -32,7 +32,7 @@ def test_abort_on_sigint(daemon):
 @tractor_test
 async def test_cancel_remote_arbiter(daemon, reg_addr):
     assert not tractor.current_actor().is_arbiter
-    async with tractor.get_registry(*reg_addr) as portal:
+    async with tractor.get_registry(reg_addr) as portal:
         await portal.cancel_actor()
 
     time.sleep(0.1)
@@ -41,7 +41,7 @@ async def test_cancel_remote_arbiter(daemon, reg_addr):
 
     # no arbiter socket should exist
     with pytest.raises(OSError):
-        async with tractor.get_registry(*reg_addr) as portal:
+        async with tractor.get_registry(reg_addr) as portal:
             pass
 
 

tests/test_ringbuf.py

@@ -0,0 +1,211 @@
+import time
+
+import trio
+import pytest
+
+import tractor
+from tractor.ipc._ringbuf import (
+    open_ringbuf,
+    RBToken,
+    RingBuffSender,
+    RingBuffReceiver
+)
+from tractor._testing.samples import (
+    generate_sample_messages,
+)
+
+# in case you don't want to melt your cores, uncomment dis!
+pytestmark = pytest.mark.skip
+
+
+@tractor.context
+async def child_read_shm(
+    ctx: tractor.Context,
+    msg_amount: int,
+    token: RBToken,
+    total_bytes: int,
+) -> None:
+    recvd_bytes = 0
+    await ctx.started()
+    start_ts = time.time()
+    async with RingBuffReceiver(token) as receiver:
+        while recvd_bytes < total_bytes:
+            msg = await receiver.receive_some()
+            recvd_bytes += len(msg)
+
+        # make sure we dont hold any memoryviews
+        # before the ctx manager aclose()
+        msg = None
+
+    end_ts = time.time()
+    elapsed = end_ts - start_ts
+    elapsed_ms = int(elapsed * 1000)
+
+    print(f'\n\telapsed ms: {elapsed_ms}')
+    print(f'\tmsg/sec: {int(msg_amount / elapsed):,}')
+    print(f'\tbytes/sec: {int(recvd_bytes / elapsed):,}')
+
+
+@tractor.context
+async def child_write_shm(
+    ctx: tractor.Context,
+    msg_amount: int,
+    rand_min: int,
+    rand_max: int,
+    token: RBToken,
+) -> None:
+    msgs, total_bytes = generate_sample_messages(
+        msg_amount,
+        rand_min=rand_min,
+        rand_max=rand_max,
+    )
+    await ctx.started(total_bytes)
+    async with RingBuffSender(token) as sender:
+        for msg in msgs:
+            await sender.send_all(msg)
+
+
+@pytest.mark.parametrize(
+    'msg_amount,rand_min,rand_max,buf_size',
+    [
+        # simple case, fixed payloads, large buffer
+        (100_000, 0, 0, 10 * 1024),
+
+        # guaranteed wrap around on every write
+        (100, 10 * 1024, 20 * 1024, 10 * 1024),
+
+        # large payload size, but large buffer
+        (10_000, 256 * 1024, 512 * 1024, 10 * 1024 * 1024)
+    ],
+    ids=[
+        'fixed_payloads_large_buffer',
+        'wrap_around_every_write',
+        'large_payloads_large_buffer',
+    ]
+)
+def test_ringbuf(
+    msg_amount: int,
+    rand_min: int,
+    rand_max: int,
+    buf_size: int
+):
+    async def main():
+        with open_ringbuf(
+            'test_ringbuf',
+            buf_size=buf_size
+        ) as token:
+            proc_kwargs = {
+                'pass_fds': (token.write_eventfd, token.wrap_eventfd)
+            }
+
+            common_kwargs = {
+                'msg_amount': msg_amount,
+                'token': token,
+            }
+            async with tractor.open_nursery() as an:
+                send_p = await an.start_actor(
+                    'ring_sender',
+                    enable_modules=[__name__],
+                    proc_kwargs=proc_kwargs
+                )
+                recv_p = await an.start_actor(
+                    'ring_receiver',
+                    enable_modules=[__name__],
+                    proc_kwargs=proc_kwargs
+                )
+                async with (
+                    send_p.open_context(
+                        child_write_shm,
+                        rand_min=rand_min,
+                        rand_max=rand_max,
+                        **common_kwargs
+                    ) as (sctx, total_bytes),
+                    recv_p.open_context(
+                        child_read_shm,
+                        **common_kwargs,
+                        total_bytes=total_bytes,
+                    ) as (sctx, _sent),
+                ):
+                    await recv_p.result()
+
+                await send_p.cancel_actor()
+                await recv_p.cancel_actor()
+
+
+    trio.run(main)
+
+
+@tractor.context
+async def child_blocked_receiver(
+    ctx: tractor.Context,
+    token: RBToken
+):
+    async with RingBuffReceiver(token) as receiver:
+        await ctx.started()
+        await receiver.receive_some()
+
+
+def test_ring_reader_cancel():
+    async def main():
+        with open_ringbuf('test_ring_cancel_reader') as token:
+            async with (
+                tractor.open_nursery() as an,
+                RingBuffSender(token) as _sender,
+            ):
+                recv_p = await an.start_actor(
+                    'ring_blocked_receiver',
+                    enable_modules=[__name__],
+                    proc_kwargs={
+                        'pass_fds': (token.write_eventfd, token.wrap_eventfd)
+                    }
+                )
+                async with (
+                    recv_p.open_context(
+                        child_blocked_receiver,
+                        token=token
+                    ) as (sctx, _sent),
+                ):
+                    await trio.sleep(1)
+                    await an.cancel()
+
+
+    with pytest.raises(tractor._exceptions.ContextCancelled):
+        trio.run(main)
+
+
+@tractor.context
+async def child_blocked_sender(
+    ctx: tractor.Context,
+    token: RBToken
+):
+    async with RingBuffSender(token) as sender:
+        await ctx.started()
+        await sender.send_all(b'this will wrap')
+
+
+def test_ring_sender_cancel():
+    async def main():
+        with open_ringbuf(
+            'test_ring_cancel_sender',
+            buf_size=1
+        ) as token:
+            async with tractor.open_nursery() as an:
+                recv_p = await an.start_actor(
+                    'ring_blocked_sender',
+                    enable_modules=[__name__],
+                    proc_kwargs={
+                        'pass_fds': (token.write_eventfd, token.wrap_eventfd)
+                    }
+                )
+                async with (
+                    recv_p.open_context(
+                        child_blocked_sender,
+                        token=token
+                    ) as (sctx, _sent),
+                ):
+                    await trio.sleep(1)
+                    await an.cancel()
+
+
+    with pytest.raises(tractor._exceptions.ContextCancelled):
+        trio.run(main)

tests/test_root_runtime.py

@@ -0,0 +1,85 @@
+'''
+Runtime boot/init sanity.
+
+'''
+
+import pytest
+import trio
+
+import tractor
+from tractor._exceptions import RuntimeFailure
+
+
+@tractor.context
+async def open_new_root_in_sub(
+    ctx: tractor.Context,
+) -> None:
+
+    async with tractor.open_root_actor():
+        pass
+
+
+@pytest.mark.parametrize(
+    'open_root_in',
+    ['root', 'sub'],
+    ids='open_2nd_root_in={}'.format,
+)
+def test_only_one_root_actor(
+    open_root_in: str,
+    reg_addr: tuple,
+    debug_mode: bool
+):
+    '''
+    Verify we specially fail whenever more then one root actor
+    is attempted to be opened within an already opened tree.
+
+    '''
+    async def main():
+        async with tractor.open_nursery() as an:
+
+            if open_root_in == 'root':
+                async with tractor.open_root_actor(
+                    registry_addrs=[reg_addr],
+                ):
+                    pass
+
+            ptl: tractor.Portal = await an.start_actor(
+                name='bad_rooty_boi',
+                enable_modules=[__name__],
+            )
+
+            async with ptl.open_context(
+                open_new_root_in_sub,
+            ) as (ctx, first):
+                pass
+
+    if open_root_in == 'root':
+        with pytest.raises(
+            RuntimeFailure
+        ) as excinfo:
+            trio.run(main)
+
+    else:
+        with pytest.raises(
+            tractor.RemoteActorError,
+        ) as excinfo:
+            trio.run(main)
+
+        assert excinfo.value.boxed_type is RuntimeFailure
+
+
+def test_implicit_root_via_first_nursery(
+    reg_addr: tuple,
+    debug_mode: bool
+):
+    '''
+    The first `ActorNursery` open should implicitly call
+    `_root.open_root_actor()`.
+
+    '''
+    async def main():
+        async with tractor.open_nursery() as an:
+            assert an._implicit_runtime_started
+            assert tractor.current_actor().aid.name == 'root'
+
+    trio.run(main)

tests/test_shm.py

@@ -8,7 +8,7 @@ import uuid
 import pytest
 import trio
 import tractor
-from tractor._shm import (
+from tractor.ipc._shm import (
     open_shm_list,
     attach_shm_list,
 )

tests/test_spawning.py

@@ -2,6 +2,7 @@
 Spawning basics
 
 """
+from functools import partial
 from typing import (
     Any,
 )
@@ -12,74 +13,99 @@ import tractor
 
 from tractor._testing import tractor_test
 
-data_to_pass_down = {'doggy': 10, 'kitty': 4}
+data_to_pass_down = {
+    'doggy': 10,
+    'kitty': 4,
+}
 
 
 async def spawn(
-    is_arbiter: bool,
+    should_be_root: bool,
     data: dict,
     reg_addr: tuple[str, int],
+
+    debug_mode: bool = False,
 ):
-    namespaces = [__name__]
-
     await trio.sleep(0.1)
+    actor = tractor.current_actor(err_on_no_runtime=False)
 
-    async with tractor.open_root_actor(
-        arbiter_addr=reg_addr,
-    ):
-        actor = tractor.current_actor()
-        assert actor.is_arbiter == is_arbiter
-        data = data_to_pass_down
+    if should_be_root:
+        assert actor is None  # no runtime yet
+        async with (
+            tractor.open_root_actor(
+                arbiter_addr=reg_addr,
+            ),
+            tractor.open_nursery() as an,
+        ):
+            # now runtime exists
+            actor: tractor.Actor = tractor.current_actor()
+            assert actor.is_arbiter == should_be_root
 
-        if actor.is_arbiter:
-            async with tractor.open_nursery() as nursery:
+            # spawns subproc here
+            portal: tractor.Portal = await an.run_in_actor(
+                fn=spawn,
 
-                # forks here
-                portal = await nursery.run_in_actor(
-                    spawn,
-                    is_arbiter=False,
-                    name='sub-actor',
-                    data=data,
-                    reg_addr=reg_addr,
-                    enable_modules=namespaces,
-                )
+                # spawning args
+                name='sub-actor',
+                enable_modules=[__name__],
 
-                assert len(nursery._children) == 1
-                assert portal.channel.uid in tractor.current_actor()._peers
-                # be sure we can still get the result
-                result = await portal.result()
-                assert result == 10
-                return result
-        else:
-            return 10
+                # passed to a subactor-recursive RPC invoke
+                # of this same `spawn()` fn.
+                should_be_root=False,
+                data=data_to_pass_down,
+                reg_addr=reg_addr,
+            )
+
+            assert len(an._children) == 1
+            assert (
+                portal.channel.uid
+                in
+                tractor.current_actor().ipc_server._peers
+            )
+
+            # get result from child subactor
+            result = await portal.result()
+            assert result == 10
+            return result
+    else:
+        assert actor.is_arbiter == should_be_root
+        return 10
 
 
-def test_local_arbiter_subactor_global_state(
-    reg_addr,
+def test_run_in_actor_same_func_in_child(
+    reg_addr: tuple,
+    debug_mode: bool,
 ):
     result = trio.run(
-        spawn,
-        True,
-        data_to_pass_down,
-        reg_addr,
+        partial(
+            spawn,
+            should_be_root=True,
+            data=data_to_pass_down,
+            reg_addr=reg_addr,
+            debug_mode=debug_mode,
+        )
     )
     assert result == 10
 
 
 async def movie_theatre_question():
-    """A question asked in a dark theatre, in a tangent
+    '''
+    A question asked in a dark theatre, in a tangent
     (errr, I mean different) process.
-    """
+
+    '''
     return 'have you ever seen a portal?'
 
 
 @tractor_test
 async def test_movie_theatre_convo(start_method):
-    """The main ``tractor`` routine.
-    """
-    async with tractor.open_nursery() as n:
+    '''
+    The main ``tractor`` routine.
 
-        portal = await n.start_actor(
+    '''
+    async with tractor.open_nursery(debug_mode=True) as an:
+
+        portal = await an.start_actor(
             'frank',
             # enable the actor to run funcs from this current module
             enable_modules=[__name__],
@@ -118,8 +144,8 @@ async def test_most_beautiful_word(
     with trio.fail_after(1):
         async with tractor.open_nursery(
             debug_mode=debug_mode,
-        ) as n:
-            portal = await n.run_in_actor(
+        ) as an:
+            portal = await an.run_in_actor(
                 cellar_door,
                 return_value=return_value,
                 name='some_linguist',

tractor/__init__.py

@@ -64,7 +64,7 @@ from ._root import (
     run_daemon as run_daemon,
     open_root_actor as open_root_actor,
 )
-from ._ipc import Channel as Channel
+from .ipc import Channel as Channel
 from ._portal import Portal as Portal
 from ._runtime import Actor as Actor
 # from . import hilevel as hilevel

tractor/_addr.py

@@ -0,0 +1,282 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+from __future__ import annotations
+from uuid import uuid4
+from typing import (
+    Protocol,
+    ClassVar,
+    Type,
+    TYPE_CHECKING,
+)
+
+from bidict import bidict
+from trio import (
+    SocketListener,
+)
+
+from .log import get_logger
+from ._state import (
+    _def_tpt_proto,
+)
+from .ipc._tcp import TCPAddress
+from .ipc._uds import UDSAddress
+
+if TYPE_CHECKING:
+    from ._runtime import Actor
+
+log = get_logger(__name__)
+
+
+# TODO, maybe breakout the netns key to a struct?
+# class NetNs(Struct)[str, int]:
+#     ...
+
+# TODO, can't we just use a type alias
+# for this? namely just some `tuple[str, int, str, str]`?
+#
+# -[ ] would also just be simpler to keep this as SockAddr[tuple]
+#     or something, implying it's just a simple pair of values which can
+#     presumably be mapped to all transports?
+# -[ ] `pydoc socket.socket.getsockname()` delivers a 4-tuple for
+#     ipv6 `(hostaddr, port, flowinfo, scope_id)`.. so how should we
+#     handle that?
+# -[ ] as a further alternative to this wrap()/unwrap() approach we
+#     could just implement `enc/dec_hook()`s for the `Address`-types
+#     and just deal with our internal objs directly and always and
+#     leave it to the codec layer to figure out marshalling?
+#    |_ would mean only one spot to do the `.unwrap()` (which we may
+#       end up needing to call from the hook()s anyway?)
+# -[x] rename to `UnwrappedAddress[Descriptor]` ??
+#    seems like the right name as per,
+#    https://www.geeksforgeeks.org/introduction-to-address-descriptor/
+#
+UnwrappedAddress = (
+    # tcp/udp/uds
+    tuple[
+        str,  # host/domain(tcp), filesys-dir(uds)
+        int|str,  # port/path(uds)
+    ]
+    # ?TODO? should we also include another 2 fields from
+    # our `Aid` msg such that we include the runtime `Actor.uid`
+    # of `.name` and `.uuid`?
+    # - would ensure uniqueness across entire net?
+    # - allows for easier runtime-level filtering of "actors by
+    #   service name"
+)
+
+
+# TODO, maybe rename to `SocketAddress`?
+class Address(Protocol):
+    proto_key: ClassVar[str]
+    unwrapped_type: ClassVar[UnwrappedAddress]
+
+    # TODO, i feel like an `.is_bound()` is a better thing to
+    # support?
+    # Lke, what use does this have besides a noop and if it's not
+    # valid why aren't we erroring on creation/use?
+    @property
+    def is_valid(self) -> bool:
+        ...
+
+    # TODO, maybe `.netns` is a better name?
+    @property
+    def namespace(self) -> tuple[str, int]|None:
+        '''
+        The if-available, OS-specific "network namespace" key.
+
+        '''
+        ...
+
+    @property
+    def bindspace(self) -> str:
+        '''
+        Deliver the socket address' "bindable space" from
+        a `socket.socket.bind()` and thus from the perspective of
+        specific transport protocol domain.
+
+        I.e. for most (layer-4) network-socket protocols this is
+        normally the ipv4/6 address, for UDS this is normally
+        a filesystem (sub-directory).
+
+        For (distributed) network protocols this is normally the routing
+        layer's domain/(ip-)address, though it might also include a "network namespace"
+        key different then the default.
+
+        For local-host-only transports this is either an explicit
+        namespace (with types defined by the OS: netns, Cgroup, IPC,
+        pid, etc. on linux) or failing that the sub-directory in the
+        filesys in which socket/shm files are located *under*.
+
+        '''
+        ...
+
+    @classmethod
+    def from_addr(cls, addr: UnwrappedAddress) -> Address:
+        ...
+
+    def unwrap(self) -> UnwrappedAddress:
+        '''
+        Deliver the underying minimum field set in
+        a primitive python data type-structure.
+        '''
+        ...
+
+    @classmethod
+    def get_random(
+        cls,
+        current_actor: Actor,
+        bindspace: str|None = None,
+    ) -> Address:
+        ...
+
+    # TODO, this should be something like a `.get_def_registar_addr()`
+    # or similar since,
+    # - it should be a **host singleton** (not root/tree singleton)
+    # - we **only need this value** when one isn't provided to the
+    #   runtime at boot and we want to implicitly provide a host-wide
+    #   registrar.
+    # - each rooted-actor-tree should likely have its own
+    #   micro-registry (likely the root being it), also see
+    @classmethod
+    def get_root(cls) -> Address:
+        ...
+
+    def __repr__(self) -> str:
+        ...
+
+    def __eq__(self, other) -> bool:
+        ...
+
+    async def open_listener(
+        self,
+        **kwargs,
+    ) -> SocketListener:
+        ...
+
+    async def close_listener(self):
+        ...
+
+
+_address_types: bidict[str, Type[Address]] = {
+    'tcp': TCPAddress,
+    'uds': UDSAddress
+}
+
+
+# TODO! really these are discovery sys default addrs ONLY useful for
+# when none is provided to a root actor on first boot.
+_default_lo_addrs: dict[
+    str,
+    UnwrappedAddress
+] = {
+    'tcp': TCPAddress.get_root().unwrap(),
+    'uds': UDSAddress.get_root().unwrap(),
+}
+
+
+def get_address_cls(name: str) -> Type[Address]:
+    return _address_types[name]
+
+
+def is_wrapped_addr(addr: any) -> bool:
+    return type(addr) in _address_types.values()
+
+
+def mk_uuid() -> str:
+    '''
+    Encapsulate creation of a uuid4 as `str` as used
+    for creating `Actor.uid: tuple[str, str]` and/or
+    `.msg.types.Aid`.
+
+    '''
+    return str(uuid4())
+
+
+def wrap_address(
+    addr: UnwrappedAddress
+) -> Address:
+    '''
+    Wrap an `UnwrappedAddress` as an `Address`-type based
+    on matching builtin python data-structures which we adhoc
+    use for each.
+
+    XXX NOTE, careful care must be placed to ensure
+    `UnwrappedAddress` cases are **definitely unique** otherwise the
+    wrong transport backend may be loaded and will break many
+    low-level things in our runtime in a not-fun-to-debug way!
+
+    XD
+
+    '''
+    if is_wrapped_addr(addr):
+        return addr
+
+    cls: Type|None = None
+    # if 'sock' in addr[0]:
+    #     import pdbp; pdbp.set_trace()
+    match addr:
+
+        # classic network socket-address as tuple/list
+        case (
+            (str(), int())
+            |
+            [str(), int()]
+        ):
+            cls = TCPAddress
+
+        case (
+            # (str()|Path(), str()|Path()),
+            # ^TODO? uhh why doesn't this work!?
+
+            (_, filename)
+        ) if type(filename) is str:
+            cls = UDSAddress
+
+        # likely an unset UDS or TCP reg address as defaulted in
+        # `_state._runtime_vars['_root_mailbox']`
+        #
+        # TODO? figure out when/if we even need this?
+        case (
+            None
+            |
+            [None, None]
+        ):
+            cls: Type[Address] = get_address_cls(_def_tpt_proto)
+            addr: UnwrappedAddress = cls.get_root().unwrap()
+
+        case _:
+            # import pdbp; pdbp.set_trace()
+            raise TypeError(
+                f'Can not wrap unwrapped-address ??\n'
+                f'type(addr): {type(addr)!r}\n'
+                f'addr: {addr!r}\n'
+            )
+
+    return cls.from_addr(addr)
+
+
+def default_lo_addrs(
+    transports: list[str],
+) -> list[Type[Address]]:
+    '''
+    Return the default, host-singleton, registry address
+    for an input transport key set.
+
+    '''
+    return [
+        _default_lo_addrs[transport]
+        for transport in transports
+    ]

tractor/_child.py

@@ -31,8 +31,12 @@ def parse_uid(arg):
     return str(name), str(uuid)  # ensures str encoding
 
 def parse_ipaddr(arg):
-    host, port = literal_eval(arg)
-    return (str(host), int(port))
+    try:
+        return literal_eval(arg)
+
+    except (ValueError, SyntaxError):
+        # UDS: try to interpret as a straight up str
+        return arg
 
 
 if __name__ == "__main__":
@@ -46,8 +50,8 @@ if __name__ == "__main__":
     args = parser.parse_args()
 
     subactor = Actor(
-        args.uid[0],
-        uid=args.uid[1],
+        name=args.uid[0],
+        uuid=args.uid[1],
         loglevel=args.loglevel,
         spawn_method="trio"
     )

tractor/_context.py

@@ -89,7 +89,7 @@ from .msg import (
     pretty_struct,
     _ops as msgops,
 )
-from ._ipc import (
+from .ipc import (
     Channel,
 )
 from ._streaming import (
@@ -105,7 +105,7 @@ from ._state import (
 if TYPE_CHECKING:
     from ._portal import Portal
     from ._runtime import Actor
-    from ._ipc import MsgTransport
+    from .ipc._transport import MsgTransport
     from .devx._frame_stack import (
         CallerInfo,
     )
@@ -366,7 +366,7 @@ class Context:
             # f'   ---\n'
             f' |_ipc: {self.dst_maddr}\n'
             # f'   dst_maddr{ds}{self.dst_maddr}\n'
-            f"   uid{ds}'{self.chan.uid}'\n"
+            f"   uid{ds}'{self.chan.aid}'\n"
             f"   cid{ds}'{self.cid}'\n"
             # f'   ---\n'
             f'\n'
@@ -859,19 +859,10 @@ class Context:
     @property
     def dst_maddr(self) -> str:
         chan: Channel = self.chan
-        dst_addr, dst_port = chan.raddr
         trans: MsgTransport = chan.transport
         # cid: str = self.cid
         # cid_head, cid_tail = cid[:6], cid[-6:]
-        return (
-            f'/ipv4/{dst_addr}'
-            f'/{trans.name_key}/{dst_port}'
-            # f'/{self.chan.uid[0]}'
-            # f'/{self.cid}'
-
-            # f'/cid={cid_head}..{cid_tail}'
-            # TODO: ? not use this ^ right ?
-        )
+        return trans.maddr
 
     dmaddr = dst_maddr
 
@@ -954,10 +945,10 @@ class Context:
         reminfo: str = (
             # ' =>\n'
             # f'Context.cancel() => {self.chan.uid}\n'
+            f'\n'
             f'c)=> {self.chan.uid}\n'
-            # f'{self.chan.uid}\n'
-            f'  |_ @{self.dst_maddr}\n'
-            f'    >> {self.repr_rpc}\n'
+            f'   |_[{self.dst_maddr}\n'
+            f'     >>{self.repr_rpc}\n'
             # f'    >> {self._nsf}() -> {codec}[dict]:\n\n'
             # TODO: pull msg-type from spec re #320
         )
@@ -1078,9 +1069,25 @@ class Context:
         |RemoteActorError  # stream overrun caused and ignored by us
     ):
         '''
-        Maybe raise a remote error depending on the type of error
-        and *who* (i.e. which task from which actor) requested
-        a  cancellation (if any).
+        Maybe raise a remote error depending on the type of error and
+        *who*, i.e. which side of the task pair across actors,
+        requested a cancellation (if any).
+
+        Depending on the input config-params suppress raising
+        certain remote excs:
+
+        - if `remote_error: ContextCancelled` (ctxc) AND this side's
+          task is the "requester", it at somem point called
+          `Context.cancel()`, then the peer's ctxc is treated
+          as a "cancel ack".
+
+         |_ this behaves exactly like how `trio.Nursery.cancel_scope`
+            absorbs any `BaseExceptionGroup[trio.Cancelled]` wherein the
+            owning parent task never will raise a `trio.Cancelled`
+            if `CancelScope.cancel_called == True`.
+
+        - `remote_error: StreamOverrrun` (overrun) AND
+           `raise_overrun_from_self` is set.
 
         '''
         __tracebackhide__: bool = hide_tb
@@ -1122,18 +1129,19 @@ class Context:
             # for this ^, NO right?
 
         ) or (
-            # NOTE: whenever this context is the cause of an
-            # overrun on the remote side (aka we sent msgs too
-            # fast that the remote task was overrun according
-            # to `MsgStream` buffer settings) AND the caller
-            # has requested to not raise overruns this side
-            # caused, we also silently absorb any remotely
-            # boxed `StreamOverrun`. This is mostly useful for
-            # supressing such faults during
-            # cancellation/error/final-result handling inside
-            # `msg._ops.drain_to_final_msg()` such that we do not
-            # raise such errors particularly in the case where
+            # NOTE: whenever this side is the cause of an
+            # overrun on the peer side, i.e. we sent msgs too
+            # fast and the peer task was overrun according
+            # to `MsgStream` buffer settings, AND this was
+            # called with `raise_overrun_from_self=True` (the
+            # default), silently absorb any `StreamOverrun`.
+            #
+            # XXX, this is namely useful for supressing such faults
+            # during cancellation/error/final-result handling inside
+            # `.msg._ops.drain_to_final_msg()` such that we do not
+            # raise during a cancellation-request, i.e. when
             # `._cancel_called == True`.
+            #
             not raise_overrun_from_self
             and isinstance(remote_error, RemoteActorError)
             and remote_error.boxed_type is StreamOverrun

tractor/_discovery.py

@@ -29,7 +29,12 @@ from contextlib import asynccontextmanager as acm
 
 from tractor.log import get_logger
 from .trionics import gather_contexts
-from ._ipc import _connect_chan, Channel
+from .ipc import _connect_chan, Channel
+from ._addr import (
+    UnwrappedAddress,
+    Address,
+    wrap_address
+)
 from ._portal import (
     Portal,
     open_portal,
@@ -38,6 +43,7 @@ from ._portal import (
 from ._state import (
     current_actor,
     _runtime_vars,
+    _def_tpt_proto,
 )
 
 if TYPE_CHECKING:
@@ -49,9 +55,7 @@ log = get_logger(__name__)
 
 @acm
 async def get_registry(
-    host: str,
-    port: int,
-
+    addr: UnwrappedAddress|None = None,
 ) -> AsyncGenerator[
     Portal | LocalPortal | None,
     None,
@@ -69,13 +73,15 @@ async def get_registry(
         # (likely a re-entrant call from the arbiter actor)
         yield LocalPortal(
             actor,
-            Channel((host, port))
+            Channel(transport=None)
+            # ^XXX, we DO NOT actually provide nor connect an
+            # underlying transport since this is merely an API shim.
         )
     else:
         # TODO: try to look pre-existing connection from
-        # `Actor._peers` and use it instead?
+        # `Server._peers` and use it instead?
         async with (
-            _connect_chan(host, port) as chan,
+            _connect_chan(addr) as chan,
             open_portal(chan) as regstr_ptl,
         ):
             yield regstr_ptl
@@ -89,11 +95,10 @@ async def get_root(
 
     # TODO: rename mailbox to `_root_maddr` when we finally
     # add and impl libp2p multi-addrs?
-    host, port = _runtime_vars['_root_mailbox']
-    assert host is not None
+    addr = _runtime_vars['_root_mailbox']
 
     async with (
-        _connect_chan(host, port) as chan,
+        _connect_chan(addr) as chan,
         open_portal(chan, **kwargs) as portal,
     ):
         yield portal
@@ -106,14 +111,14 @@ def get_peer_by_name(
 ) -> list[Channel]|None:  # at least 1
     '''
     Scan for an existing connection (set) to a named actor
-    and return any channels from `Actor._peers`.
+    and return any channels from `Server._peers: dict`.
 
     This is an optimization method over querying the registrar for
     the same info.
 
     '''
     actor: Actor = current_actor()
-    to_scan: dict[tuple, list[Channel]] = actor._peers.copy()
+    to_scan: dict[tuple, list[Channel]] = actor.ipc_server._peers.copy()
 
     # TODO: is this ever needed? creates a duplicate channel on actor._peers
     # when multiple find_actor calls are made to same actor from a single ctx
@@ -140,10 +145,10 @@ def get_peer_by_name(
 @acm
 async def query_actor(
     name: str,
-    regaddr: tuple[str, int]|None = None,
+    regaddr: UnwrappedAddress|None = None,
 
 ) -> AsyncGenerator[
-    tuple[str, int]|None,
+    UnwrappedAddress|None,
     None,
 ]:
     '''
@@ -169,31 +174,31 @@ async def query_actor(
         return
 
     reg_portal: Portal
-    regaddr: tuple[str, int] = regaddr or actor.reg_addrs[0]
-    async with get_registry(*regaddr) as reg_portal:
+    regaddr: Address = wrap_address(regaddr) or actor.reg_addrs[0]
+    async with get_registry(regaddr) as reg_portal:
         # TODO: return portals to all available actors - for now
         # just the last one that registered
-        sockaddr: tuple[str, int] = await reg_portal.run_from_ns(
+        addr: UnwrappedAddress = await reg_portal.run_from_ns(
             'self',
             'find_actor',
             name=name,
         )
-        yield sockaddr
+        yield addr
 
 
 @acm
 async def maybe_open_portal(
-    addr: tuple[str, int],
+    addr: UnwrappedAddress,
     name: str,
 ):
     async with query_actor(
         name=name,
         regaddr=addr,
-    ) as sockaddr:
+    ) as addr:
         pass
 
-    if sockaddr:
-        async with _connect_chan(*sockaddr) as chan:
+    if addr:
+        async with _connect_chan(addr) as chan:
             async with open_portal(chan) as portal:
                 yield portal
     else:
@@ -203,7 +208,8 @@ async def maybe_open_portal(
 @acm
 async def find_actor(
     name: str,
-    registry_addrs: list[tuple[str, int]]|None = None,
+    registry_addrs: list[UnwrappedAddress]|None = None,
+    enable_transports: list[str] = [_def_tpt_proto],
 
     only_first: bool = True,
     raise_on_none: bool = False,
@@ -230,15 +236,15 @@ async def find_actor(
         # XXX NOTE: make sure to dynamically read the value on
         # every call since something may change it globally (eg.
         # like in our discovery test suite)!
-        from . import _root
+        from ._addr import default_lo_addrs
         registry_addrs = (
             _runtime_vars['_registry_addrs']
             or
-            _root._default_lo_addrs
+            default_lo_addrs(enable_transports)
         )
 
     maybe_portals: list[
-        AsyncContextManager[tuple[str, int]]
+        AsyncContextManager[UnwrappedAddress]
     ] = list(
         maybe_open_portal(
             addr=addr,
@@ -280,7 +286,7 @@ async def find_actor(
 @acm
 async def wait_for_actor(
     name: str,
-    registry_addr: tuple[str, int] | None = None,
+    registry_addr: UnwrappedAddress | None = None,
 
 ) -> AsyncGenerator[Portal, None]:
     '''
@@ -297,7 +303,7 @@ async def wait_for_actor(
             yield peer_portal
             return
 
-    regaddr: tuple[str, int] = (
+    regaddr: UnwrappedAddress = (
         registry_addr
         or
         actor.reg_addrs[0]
@@ -305,8 +311,8 @@ async def wait_for_actor(
     # TODO: use `.trionics.gather_contexts()` like
     # above in `find_actor()` as well?
     reg_portal: Portal
-    async with get_registry(*regaddr) as reg_portal:
-        sockaddrs = await reg_portal.run_from_ns(
+    async with get_registry(regaddr) as reg_portal:
+        addrs = await reg_portal.run_from_ns(
             'self',
             'wait_for_actor',
             name=name,
@@ -314,8 +320,8 @@ async def wait_for_actor(
 
         # get latest registered addr by default?
         # TODO: offer multi-portal yields in multi-homed case?
-        sockaddr: tuple[str, int] = sockaddrs[-1]
+        addr: UnwrappedAddress = addrs[-1]
 
-        async with _connect_chan(*sockaddr) as chan:
+        async with _connect_chan(addr) as chan:
             async with open_portal(chan) as portal:
                 yield portal

tractor/_entry.py

@@ -37,6 +37,7 @@ from .log import (
 from . import _state
 from .devx import _debug
 from .to_asyncio import run_as_asyncio_guest
+from ._addr import UnwrappedAddress
 from ._runtime import (
     async_main,
     Actor,
@@ -52,10 +53,10 @@ log = get_logger(__name__)
 def _mp_main(
 
     actor: Actor,
-    accept_addrs: list[tuple[str, int]],
+    accept_addrs: list[UnwrappedAddress],
     forkserver_info: tuple[Any, Any, Any, Any, Any],
     start_method: SpawnMethodKey,
-    parent_addr: tuple[str, int] | None = None,
+    parent_addr: UnwrappedAddress | None = None,
     infect_asyncio: bool = False,
 
 ) -> None:
@@ -206,7 +207,7 @@ def nest_from_op(
 def _trio_main(
     actor: Actor,
     *,
-    parent_addr: tuple[str, int] | None = None,
+    parent_addr: UnwrappedAddress|None = None,
     infect_asyncio: bool = False,
 
 ) -> None:

tractor/_exceptions.py

@@ -23,7 +23,6 @@ import builtins
 import importlib
 from pprint import pformat
 from pdb import bdb
-import sys
 from types import (
     TracebackType,
 )
@@ -65,15 +64,29 @@ if TYPE_CHECKING:
     from ._context import Context
     from .log import StackLevelAdapter
     from ._stream import MsgStream
-    from ._ipc import Channel
+    from .ipc import Channel
 
 log = get_logger('tractor')
 
 _this_mod = importlib.import_module(__name__)
 
 
-class ActorFailure(Exception):
-    "General actor failure"
+class RuntimeFailure(RuntimeError):
+    '''
+    General `Actor`-runtime failure due to,
+
+    - a bad runtime-env,
+    - falied spawning (bad input to process),
+    -   API usage.
+
+    '''
+
+
+class ActorFailure(RuntimeFailure):
+    '''
+    `Actor` failed to boot before/after spawn
+
+    '''
 
 
 class InternalError(RuntimeError):
@@ -126,6 +139,12 @@ class TrioTaskExited(Exception):
     '''
 
 
+class DebugRequestError(RuntimeError):
+    '''
+    Failed to request stdio lock from root actor!
+
+    '''
+
 # NOTE: more or less should be close to these:
 # 'boxed_type',
 # 'src_type',
@@ -191,6 +210,8 @@ def get_err_type(type_name: str) -> BaseException|None:
         ):
             return type_ref
 
+    return None
+
 
 def pack_from_raise(
     local_err: (
@@ -521,7 +542,6 @@ class RemoteActorError(Exception):
             if val:
                 _repr += f'{key}={val_str}{end_char}'
 
-
         return _repr
 
     def reprol(self) -> str:
@@ -600,56 +620,9 @@ class RemoteActorError(Exception):
             the type name is already implicitly shown by python).
 
         '''
-        header: str = ''
-        body: str = ''
-        message: str = ''
-
-        # XXX when the currently raised exception is this instance,
-        # we do not ever use the "type header" style repr.
-        is_being_raised: bool = False
-        if (
-            (exc := sys.exception())
-            and
-            exc is self
-        ):
-            is_being_raised: bool = True
-
-        with_type_header: bool = (
-            with_type_header
-            and
-            not is_being_raised
-        )
-
-        # <RemoteActorError( .. )> style
-        if with_type_header:
-            header: str = f'<{type(self).__name__}('
-
-        if message := self._message:
-
-            # split off the first line so, if needed, it isn't
-            # indented the same like the "boxed content" which
-            # since there is no `.tb_str` is just the `.message`.
-            lines: list[str] = message.splitlines()
-            first: str = lines[0]
-            message: str = message.removeprefix(first)
-
-            # with a type-style header we,
-            # - have no special message "first line" extraction/handling
-            # - place the message a space in from the header:
-            #  `MsgTypeError( <message> ..`
-            #                 ^-here
-            # - indent the `.message` inside the type body.
-            if with_type_header:
-                first = f' {first} )>'
-
-            message: str = textwrap.indent(
-                message,
-                prefix=' '*2,
-            )
-            message: str = first + message
-
         # IFF there is an embedded traceback-str we always
         # draw the ascii-box around it.
+        body: str = ''
         if tb_str := self.tb_str:
             fields: str = self._mk_fields_str(
                 _body_fields
@@ -670,21 +643,15 @@ class RemoteActorError(Exception):
                 boxer_header=self.relay_uid,
             )
 
-        tail = ''
-        if (
-            with_type_header
-            and not message
-        ):
-            tail: str = '>'
-
-        return (
-            header
-            +
-            message
-            +
-            f'{body}'
-            +
-            tail
+        # !TODO, it'd be nice to import these top level without
+        # cycles!
+        from tractor.devx.pformat import (
+            pformat_exc,
+        )
+        return pformat_exc(
+            exc=self,
+            with_type_header=with_type_header,
+            body=body,
         )
 
     __repr__ = pformat
@@ -962,7 +929,7 @@ class StreamOverrun(
     '''
 
 
-class TransportClosed(trio.BrokenResourceError):
+class TransportClosed(Exception):
     '''
     IPC transport (protocol) connection was closed or broke and
     indicates that the wrapping communication `Channel` can no longer
@@ -973,24 +940,39 @@ class TransportClosed(trio.BrokenResourceError):
         self,
         message: str,
         loglevel: str = 'transport',
-        cause: BaseException|None = None,
+        src_exc: Exception|None = None,
         raise_on_report: bool = False,
 
     ) -> None:
         self.message: str = message
-        self._loglevel = loglevel
+        self._loglevel: str = loglevel
         super().__init__(message)
 
-        if cause is not None:
-            self.__cause__ = cause
+        self._src_exc = src_exc
+        # set the cause manually if not already set by python
+        if (
+            src_exc is not None
+            and
+            not self.__cause__
+        ):
+            self.__cause__ = src_exc
 
         # flag to toggle whether the msg loop should raise
         # the exc in its `TransportClosed` handler block.
         self._raise_on_report = raise_on_report
 
+    @property
+    def src_exc(self) -> Exception:
+        return (
+            self.__cause__
+            or
+            self._src_exc
+        )
+
     def report_n_maybe_raise(
         self,
         message: str|None = None,
+        hide_tb: bool = True,
 
     ) -> None:
         '''
@@ -998,9 +980,10 @@ class TransportClosed(trio.BrokenResourceError):
         for this error.
 
         '''
+        __tracebackhide__: bool = hide_tb
         message: str = message or self.message
         # when a cause is set, slap it onto the log emission.
-        if cause := self.__cause__:
+        if cause := self.src_exc:
             cause_tb_str: str = ''.join(
                 traceback.format_tb(cause.__traceback__)
             )
@@ -1009,13 +992,86 @@ class TransportClosed(trio.BrokenResourceError):
                 f'    {cause}\n'  # exc repr
             )
 
-        getattr(log, self._loglevel)(message)
+        getattr(
+            log,
+            self._loglevel
+        )(message)
 
         # some errors we want to blow up from
         # inside the RPC msg loop
         if self._raise_on_report:
             raise self from cause
 
+    @classmethod
+    def repr_src_exc(
+        self,
+        src_exc: Exception|None = None,
+    ) -> str:
+
+        if src_exc is None:
+            return '<unknown>'
+
+        src_msg: tuple[str] = src_exc.args
+        src_exc_repr: str = (
+            f'{type(src_exc).__name__}[ {src_msg} ]'
+        )
+        return src_exc_repr
+
+    def pformat(self) -> str:
+        from tractor.devx.pformat import (
+            pformat_exc,
+        )
+        return pformat_exc(
+            exc=self,
+        )
+
+    # delegate to `str`-ified pformat
+    __repr__ = pformat
+
+    @classmethod
+    def from_src_exc(
+        cls,
+        src_exc: (
+            Exception|
+            trio.ClosedResource|
+            trio.BrokenResourceError
+        ),
+        message: str,
+        body: str = '',
+        **init_kws,
+    ) -> TransportClosed:
+        '''
+        Convenience constructor for creation from an underlying
+        `trio`-sourced async-resource/chan/stream error.
+
+        Embeds the original `src_exc`'s repr within the
+        `Exception.args` via a first-line-in-`.message`-put-in-header
+        pre-processing and allows inserting additional content beyond
+        the main message via a `body: str`.
+
+        '''
+        repr_src_exc: str = cls.repr_src_exc(
+            src_exc,
+        )
+        next_line: str = f'  src_exc: {repr_src_exc}\n'
+        if body:
+            body: str = textwrap.indent(
+                body,
+                prefix=' '*2,
+            )
+
+        return TransportClosed(
+            message=(
+                message
+                +
+                next_line
+                +
+                body
+            ),
+            src_exc=src_exc,
+            **init_kws,
+        )
+
 
 class NoResult(RuntimeError):
     "No final result is expected for this actor"

tractor/_ipc.py

@@ -1,820 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-"""
-Inter-process comms abstractions
-
-"""
-from __future__ import annotations
-from collections.abc import (
-    AsyncGenerator,
-    AsyncIterator,
-)
-from contextlib import (
-    asynccontextmanager as acm,
-    contextmanager as cm,
-)
-import platform
-from pprint import pformat
-import struct
-import typing
-from typing import (
-    Any,
-    Callable,
-    runtime_checkable,
-    Protocol,
-    Type,
-    TypeVar,
-)
-
-import msgspec
-from tricycle import BufferedReceiveStream
-import trio
-
-from tractor.log import get_logger
-from tractor._exceptions import (
-    MsgTypeError,
-    pack_from_raise,
-    TransportClosed,
-    _mk_send_mte,
-    _mk_recv_mte,
-)
-from tractor.msg import (
-    _ctxvar_MsgCodec,
-    # _codec,  XXX see `self._codec` sanity/debug checks
-    MsgCodec,
-    types as msgtypes,
-    pretty_struct,
-)
-
-log = get_logger(__name__)
-
-_is_windows = platform.system() == 'Windows'
-
-
-def get_stream_addrs(
-    stream: trio.SocketStream
-) -> tuple[
-    tuple[str, int],  # local
-    tuple[str, int],  # remote
-]:
-    '''
-    Return the `trio` streaming transport prot's socket-addrs for
-    both the local and remote sides as a pair.
-
-    '''
-    # rn, should both be IP sockets
-    lsockname = stream.socket.getsockname()
-    rsockname = stream.socket.getpeername()
-    return (
-        tuple(lsockname[:2]),
-        tuple(rsockname[:2]),
-    )
-
-
-# from tractor.msg.types import MsgType
-# ?TODO? this should be our `Union[*msgtypes.__spec__]` alias now right..?
-# => BLEH, except can't bc prots must inherit typevar or param-spec
-#   vars..
-MsgType = TypeVar('MsgType')
-
-
-# TODO: break up this mod into a subpkg so we can start adding new
-# backends and move this type stuff into a dedicated file.. Bo
-#
-@runtime_checkable
-class MsgTransport(Protocol[MsgType]):
-#
-# ^-TODO-^ consider using a generic def and indexing with our
-# eventual msg definition/types?
-# - https://docs.python.org/3/library/typing.html#typing.Protocol
-
-    stream: trio.SocketStream
-    drained: list[MsgType]
-
-    def __init__(self, stream: trio.SocketStream) -> None:
-        ...
-
-    # XXX: should this instead be called `.sendall()`?
-    async def send(self, msg: MsgType) -> None:
-        ...
-
-    async def recv(self) -> MsgType:
-        ...
-
-    def __aiter__(self) -> MsgType:
-        ...
-
-    def connected(self) -> bool:
-        ...
-
-    # defining this sync otherwise it causes a mypy error because it
-    # can't figure out it's a generator i guess?..?
-    def drain(self) -> AsyncIterator[dict]:
-        ...
-
-    @property
-    def laddr(self) -> tuple[str, int]:
-        ...
-
-    @property
-    def raddr(self) -> tuple[str, int]:
-        ...
-
-
-# TODO: typing oddity.. not sure why we have to inherit here, but it
-# seems to be an issue with `get_msg_transport()` returning
-# a `Type[Protocol]`; probably should make a `mypy` issue?
-class MsgpackTCPStream(MsgTransport):
-    '''
-    A ``trio.SocketStream`` delivering ``msgpack`` formatted data
-    using the ``msgspec`` codec lib.
-
-    '''
-    layer_key: int = 4
-    name_key: str = 'tcp'
-
-    # TODO: better naming for this?
-    # -[ ] check how libp2p does naming for such things?
-    codec_key: str = 'msgpack'
-
-    def __init__(
-        self,
-        stream: trio.SocketStream,
-        prefix_size: int = 4,
-
-        # XXX optionally provided codec pair for `msgspec`:
-        # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
-        #
-        # TODO: define this as a `Codec` struct which can be
-        # overriden dynamically by the application/runtime?
-        codec: tuple[
-            Callable[[Any], Any]|None,  # coder
-            Callable[[type, Any], Any]|None,  # decoder
-        ]|None = None,
-
-    ) -> None:
-
-        self.stream = stream
-        assert self.stream.socket
-
-        # should both be IP sockets
-        self._laddr, self._raddr = get_stream_addrs(stream)
-
-        # create read loop instance
-        self._aiter_pkts = self._iter_packets()
-        self._send_lock = trio.StrictFIFOLock()
-
-        # public i guess?
-        self.drained: list[dict] = []
-
-        self.recv_stream = BufferedReceiveStream(
-            transport_stream=stream
-        )
-        self.prefix_size = prefix_size
-
-        # allow for custom IPC msg interchange format
-        # dynamic override Bo
-        self._task = trio.lowlevel.current_task()
-
-        # XXX for ctxvar debug only!
-        # self._codec: MsgCodec = (
-        #     codec
-        #     or
-        #     _codec._ctxvar_MsgCodec.get()
-        # )
-
-    async def _iter_packets(self) -> AsyncGenerator[dict, None]:
-        '''
-        Yield `bytes`-blob decoded packets from the underlying TCP
-        stream using the current task's `MsgCodec`.
-
-        This is a streaming routine implemented as an async generator
-        func (which was the original design, but could be changed?)
-        and is allocated by a `.__call__()` inside `.__init__()` where
-        it is assigned to the `._aiter_pkts` attr.
-
-        '''
-        decodes_failed: int = 0
-
-        while True:
-            try:
-                header: bytes = await self.recv_stream.receive_exactly(4)
-            except (
-                ValueError,
-                ConnectionResetError,
-
-                # not sure entirely why we need this but without it we
-                # seem to be getting racy failures here on
-                # arbiter/registry name subs..
-                trio.BrokenResourceError,
-
-            ) as trans_err:
-
-                loglevel = 'transport'
-                match trans_err:
-                    # case (
-                    #     ConnectionResetError()
-                    # ):
-                    #     loglevel = 'transport'
-
-                    # peer actor (graceful??) TCP EOF but `tricycle`
-                    # seems to raise a 0-bytes-read?
-                    case ValueError() if (
-                        'unclean EOF' in trans_err.args[0]
-                    ):
-                        pass
-
-                    # peer actor (task) prolly shutdown quickly due
-                    # to cancellation
-                    case trio.BrokenResourceError() if (
-                        'Connection reset by peer' in trans_err.args[0]
-                    ):
-                        pass
-
-                    # unless the disconnect condition falls under "a
-                    # normal operation breakage" we usualy console warn
-                    # about it.
-                    case _:
-                        loglevel: str = 'warning'
-
-
-                raise TransportClosed(
-                    message=(
-                        f'IPC transport already closed by peer\n'
-                        f'x]> {type(trans_err)}\n'
-                        f'  |_{self}\n'
-                    ),
-                    loglevel=loglevel,
-                ) from trans_err
-
-            # XXX definitely can happen if transport is closed
-            # manually by another `trio.lowlevel.Task` in the
-            # same actor; we use this in some simulated fault
-            # testing for ex, but generally should never happen
-            # under normal operation!
-            #
-            # NOTE: as such we always re-raise this error from the
-            #       RPC msg loop!
-            except trio.ClosedResourceError as closure_err:
-                raise TransportClosed(
-                    message=(
-                        f'IPC transport already manually closed locally?\n'
-                        f'x]> {type(closure_err)} \n'
-                        f'  |_{self}\n'
-                    ),
-                    loglevel='error',
-                    raise_on_report=(
-                        closure_err.args[0] == 'another task closed this fd'
-                        or
-                        closure_err.args[0] in ['another task closed this fd']
-                    ),
-                ) from closure_err
-
-            # graceful TCP EOF disconnect
-            if header == b'':
-                raise TransportClosed(
-                    message=(
-                        f'IPC transport already gracefully closed\n'
-                        f']>\n'
-                        f' |_{self}\n'
-                    ),
-                    loglevel='transport',
-                    # cause=???  # handy or no?
-                )
-
-            size: int
-            size, = struct.unpack("<I", header)
-
-            log.transport(f'received header {size}')  # type: ignore
-            msg_bytes: bytes = await self.recv_stream.receive_exactly(size)
-
-            log.transport(f"received {msg_bytes}")  # type: ignore
-            try:
-                # NOTE: lookup the `trio.Task.context`'s var for
-                # the current `MsgCodec`.
-                codec: MsgCodec = _ctxvar_MsgCodec.get()
-
-                # XXX for ctxvar debug only!
-                # if self._codec.pld_spec != codec.pld_spec:
-                #     assert (
-                #         task := trio.lowlevel.current_task()
-                #     ) is not self._task
-                #     self._task = task
-                #     self._codec = codec
-                #     log.runtime(
-                #         f'Using new codec in {self}.recv()\n'
-                #         f'codec: {self._codec}\n\n'
-                #         f'msg_bytes: {msg_bytes}\n'
-                #     )
-                yield codec.decode(msg_bytes)
-
-            # XXX NOTE: since the below error derives from
-            # `DecodeError` we need to catch is specially
-            # and always raise such that spec violations
-            # are never allowed to be caught silently!
-            except msgspec.ValidationError as verr:
-                msgtyperr: MsgTypeError = _mk_recv_mte(
-                    msg=msg_bytes,
-                    codec=codec,
-                    src_validation_error=verr,
-                )
-                # XXX deliver up to `Channel.recv()` where
-                # a re-raise and `Error`-pack can inject the far
-                # end actor `.uid`.
-                yield msgtyperr
-
-            except (
-                msgspec.DecodeError,
-                UnicodeDecodeError,
-            ):
-                if decodes_failed < 4:
-                    # ignore decoding errors for now and assume they have to
-                    # do with a channel drop - hope that receiving from the
-                    # channel will raise an expected error and bubble up.
-                    try:
-                        msg_str: str|bytes = msg_bytes.decode()
-                    except UnicodeDecodeError:
-                        msg_str = msg_bytes
-
-                    log.exception(
-                        'Failed to decode msg?\n'
-                        f'{codec}\n\n'
-                        'Rxed bytes from wire:\n\n'
-                        f'{msg_str!r}\n'
-                    )
-                    decodes_failed += 1
-                else:
-                    raise
-
-    async def send(
-        self,
-        msg: msgtypes.MsgType,
-
-        strict_types: bool = True,
-        hide_tb: bool = False,
-
-    ) -> None:
-        '''
-        Send a msgpack encoded py-object-blob-as-msg over TCP.
-
-        If `strict_types == True` then a `MsgTypeError` will be raised on any
-        invalid msg type
-
-        '''
-        __tracebackhide__: bool = hide_tb
-
-        # XXX see `trio._sync.AsyncContextManagerMixin` for details
-        # on the `.acquire()`/`.release()` sequencing..
-        async with self._send_lock:
-
-            # NOTE: lookup the `trio.Task.context`'s var for
-            # the current `MsgCodec`.
-            codec: MsgCodec = _ctxvar_MsgCodec.get()
-
-            # XXX for ctxvar debug only!
-            # if self._codec.pld_spec != codec.pld_spec:
-            #     self._codec = codec
-            #     log.runtime(
-            #         f'Using new codec in {self}.send()\n'
-            #         f'codec: {self._codec}\n\n'
-            #         f'msg: {msg}\n'
-            #     )
-
-            if type(msg) not in msgtypes.__msg_types__:
-                if strict_types:
-                    raise _mk_send_mte(
-                        msg,
-                        codec=codec,
-                    )
-                else:
-                    log.warning(
-                        'Sending non-`Msg`-spec msg?\n\n'
-                        f'{msg}\n'
-                    )
-
-            try:
-                bytes_data: bytes = codec.encode(msg)
-            except TypeError as _err:
-                typerr = _err
-                msgtyperr: MsgTypeError = _mk_send_mte(
-                    msg,
-                    codec=codec,
-                    message=(
-                        f'IPC-msg-spec violation in\n\n'
-                        f'{pretty_struct.Struct.pformat(msg)}'
-                    ),
-                    src_type_error=typerr,
-                )
-                raise msgtyperr from typerr
-
-            # supposedly the fastest says,
-            # https://stackoverflow.com/a/54027962
-            size: bytes = struct.pack("<I", len(bytes_data))
-            return await self.stream.send_all(size + bytes_data)
-
-        # ?TODO? does it help ever to dynamically show this
-        # frame?
-        # try:
-        #     <the-above_code>
-        # except BaseException as _err:
-        #     err = _err
-        #     if not isinstance(err, MsgTypeError):
-        #         __tracebackhide__: bool = False
-        #     raise
-
-    @property
-    def laddr(self) -> tuple[str, int]:
-        return self._laddr
-
-    @property
-    def raddr(self) -> tuple[str, int]:
-        return self._raddr
-
-    async def recv(self) -> Any:
-        return await self._aiter_pkts.asend(None)
-
-    async def drain(self) -> AsyncIterator[dict]:
-        '''
-        Drain the stream's remaining messages sent from
-        the far end until the connection is closed by
-        the peer.
-
-        '''
-        try:
-            async for msg in self._iter_packets():
-                self.drained.append(msg)
-        except TransportClosed:
-            for msg in self.drained:
-                yield msg
-
-    def __aiter__(self):
-        return self._aiter_pkts
-
-    def connected(self) -> bool:
-        return self.stream.socket.fileno() != -1
-
-
-def get_msg_transport(
-
-    key: tuple[str, str],
-
-) -> Type[MsgTransport]:
-
-    return {
-        ('msgpack', 'tcp'): MsgpackTCPStream,
-    }[key]
-
-
-class Channel:
-    '''
-    An inter-process channel for communication between (remote) actors.
-
-    Wraps a ``MsgStream``: transport + encoding IPC connection.
-
-    Currently we only support ``trio.SocketStream`` for transport
-    (aka TCP) and the ``msgpack`` interchange format via the ``msgspec``
-    codec libary.
-
-    '''
-    def __init__(
-
-        self,
-        destaddr: tuple[str, int]|None,
-
-        msg_transport_type_key: tuple[str, str] = ('msgpack', 'tcp'),
-
-        # TODO: optional reconnection support?
-        # auto_reconnect: bool = False,
-        # on_reconnect: typing.Callable[..., typing.Awaitable] = None,
-
-    ) -> None:
-
-        # self._recon_seq = on_reconnect
-        # self._autorecon = auto_reconnect
-
-        self._destaddr = destaddr
-        self._transport_key = msg_transport_type_key
-
-        # Either created in ``.connect()`` or passed in by
-        # user in ``.from_stream()``.
-        self._stream: trio.SocketStream|None = None
-        self._transport: MsgTransport|None = None
-
-        # set after handshake - always uid of far end
-        self.uid: tuple[str, str]|None = None
-
-        self._aiter_msgs = self._iter_msgs()
-        self._exc: Exception|None = None  # set if far end actor errors
-        self._closed: bool = False
-
-        # flag set by ``Portal.cancel_actor()`` indicating remote
-        # (possibly peer) cancellation of the far end actor
-        # runtime.
-        self._cancel_called: bool = False
-
-    @property
-    def msgstream(self) -> MsgTransport:
-        log.info(
-            '`Channel.msgstream` is an old name, use `._transport`'
-        )
-        return self._transport
-
-    @property
-    def transport(self) -> MsgTransport:
-        return self._transport
-
-    @classmethod
-    def from_stream(
-        cls,
-        stream: trio.SocketStream,
-        **kwargs,
-
-    ) -> Channel:
-
-        src, dst = get_stream_addrs(stream)
-        chan = Channel(
-            destaddr=dst,
-            **kwargs,
-        )
-
-        # set immediately here from provided instance
-        chan._stream: trio.SocketStream = stream
-        chan.set_msg_transport(stream)
-        return chan
-
-    def set_msg_transport(
-        self,
-        stream: trio.SocketStream,
-        type_key: tuple[str, str]|None = None,
-
-        # XXX optionally provided codec pair for `msgspec`:
-        # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
-        codec: MsgCodec|None = None,
-
-    ) -> MsgTransport:
-        type_key = (
-            type_key
-            or
-            self._transport_key
-        )
-        # get transport type, then
-        self._transport = get_msg_transport(
-            type_key
-        # instantiate an instance of the msg-transport
-        )(
-            stream,
-            codec=codec,
-        )
-        return self._transport
-
-    @cm
-    def apply_codec(
-        self,
-        codec: MsgCodec,
-
-    ) -> None:
-        '''
-        Temporarily override the underlying IPC msg codec for
-        dynamic enforcement of messaging schema.
-
-        '''
-        orig: MsgCodec = self._transport.codec
-        try:
-            self._transport.codec = codec
-            yield
-        finally:
-            self._transport.codec = orig
-
-    # TODO: do a .src/.dst: str for maddrs?
-    def __repr__(self) -> str:
-        if not self._transport:
-            return '<Channel with inactive transport?>'
-
-        return repr(
-            self._transport.stream.socket._sock
-        ).replace(  # type: ignore
-            "socket.socket",
-            "Channel",
-        )
-
-    @property
-    def laddr(self) -> tuple[str, int]|None:
-        return self._transport.laddr if self._transport else None
-
-    @property
-    def raddr(self) -> tuple[str, int]|None:
-        return self._transport.raddr if self._transport else None
-
-    async def connect(
-        self,
-        destaddr: tuple[Any, ...] | None = None,
-        **kwargs
-
-    ) -> MsgTransport:
-
-        if self.connected():
-            raise RuntimeError("channel is already connected?")
-
-        destaddr = destaddr or self._destaddr
-        assert isinstance(destaddr, tuple)
-
-        stream = await trio.open_tcp_stream(
-            *destaddr,
-            **kwargs
-        )
-        transport = self.set_msg_transport(stream)
-
-        log.transport(
-            f'Opened channel[{type(transport)}]: {self.laddr} -> {self.raddr}'
-        )
-        return transport
-
-    # TODO: something like,
-    # `pdbp.hideframe_on(errors=[MsgTypeError])`
-    # instead of the `try/except` hack we have rn..
-    # seems like a pretty useful thing to have in general
-    # along with being able to filter certain stack frame(s / sets)
-    # possibly based on the current log-level?
-    async def send(
-        self,
-        payload: Any,
-
-        hide_tb: bool = False,
-
-    ) -> None:
-        '''
-        Send a coded msg-blob over the transport.
-
-        '''
-        __tracebackhide__: bool = hide_tb
-        try:
-            log.transport(
-                '=> send IPC msg:\n\n'
-                f'{pformat(payload)}\n'
-            )
-            # assert self._transport  # but why typing?
-            await self._transport.send(
-                payload,
-                hide_tb=hide_tb,
-            )
-        except BaseException as _err:
-            err = _err  # bind for introspection
-            if not isinstance(_err, MsgTypeError):
-                # assert err
-                __tracebackhide__: bool = False
-            else:
-                assert err.cid
-
-            raise
-
-    async def recv(self) -> Any:
-        assert self._transport
-        return await self._transport.recv()
-
-        # TODO: auto-reconnect features like 0mq/nanomsg?
-        # -[ ] implement it manually with nods to SC prot
-        #      possibly on multiple transport backends?
-        #  -> seems like that might be re-inventing scalability
-        #     prots tho no?
-        # try:
-        #     return await self._transport.recv()
-        # except trio.BrokenResourceError:
-        #     if self._autorecon:
-        #         await self._reconnect()
-        #         return await self.recv()
-        #     raise
-
-    async def aclose(self) -> None:
-
-        log.transport(
-            f'Closing channel to {self.uid} '
-            f'{self.laddr} -> {self.raddr}'
-        )
-        assert self._transport
-        await self._transport.stream.aclose()
-        self._closed = True
-
-    async def __aenter__(self):
-        await self.connect()
-        return self
-
-    async def __aexit__(self, *args):
-        await self.aclose(*args)
-
-    def __aiter__(self):
-        return self._aiter_msgs
-
-    # ?TODO? run any reconnection sequence?
-    # -[ ] prolly should be impl-ed as deco-API?
-    #
-    # async def _reconnect(self) -> None:
-    #     """Handle connection failures by polling until a reconnect can be
-    #     established.
-    #     """
-    #     down = False
-    #     while True:
-    #         try:
-    #             with trio.move_on_after(3) as cancel_scope:
-    #                 await self.connect()
-    #             cancelled = cancel_scope.cancelled_caught
-    #             if cancelled:
-    #                 log.transport(
-    #                     "Reconnect timed out after 3 seconds, retrying...")
-    #                 continue
-    #             else:
-    #                 log.transport("Stream connection re-established!")
-
-    #                 # on_recon = self._recon_seq
-    #                 # if on_recon:
-    #                 #     await on_recon(self)
-
-    #                 break
-    #         except (OSError, ConnectionRefusedError):
-    #             if not down:
-    #                 down = True
-    #                 log.transport(
-    #                     f"Connection to {self.raddr} went down, waiting"
-    #                     " for re-establishment")
-    #             await trio.sleep(1)
-
-    async def _iter_msgs(
-        self
-    ) -> AsyncGenerator[Any, None]:
-        '''
-        Yield `MsgType` IPC msgs decoded and deliverd from
-        an underlying `MsgTransport` protocol.
-
-        This is a streaming routine alo implemented as an async-gen
-        func (same a `MsgTransport._iter_pkts()`) gets allocated by
-        a `.__call__()` inside `.__init__()` where it is assigned to
-        the `._aiter_msgs` attr.
-
-        '''
-        assert self._transport
-        while True:
-            try:
-                async for msg in self._transport:
-                    match msg:
-                        # NOTE: if transport/interchange delivers
-                        # a type error, we pack it with the far
-                        # end peer `Actor.uid` and relay the
-                        # `Error`-msg upward to the `._rpc` stack
-                        # for normal RAE handling.
-                        case MsgTypeError():
-                            yield pack_from_raise(
-                                local_err=msg,
-                                cid=msg.cid,
-
-                                # XXX we pack it here bc lower
-                                # layers have no notion of an
-                                # actor-id ;)
-                                src_uid=self.uid,
-                            )
-                        case _:
-                            yield msg
-
-            except trio.BrokenResourceError:
-
-                # if not self._autorecon:
-                raise
-
-            await self.aclose()
-
-            # if self._autorecon:  # attempt reconnect
-            #     await self._reconnect()
-            #     continue
-
-    def connected(self) -> bool:
-        return self._transport.connected() if self._transport else False
-
-
-@acm
-async def _connect_chan(
-    host: str,
-    port: int
-
-) -> typing.AsyncGenerator[Channel, None]:
-    '''
-    Create and connect a channel with disconnect on context manager
-    teardown.
-
-    '''
-    chan = Channel((host, port))
-    await chan.connect()
-    yield chan
-    with trio.CancelScope(shield=True):
-        await chan.aclose()

tractor/_portal.py

@@ -43,7 +43,7 @@ from .trionics import maybe_open_nursery
 from ._state import (
     current_actor,
 )
-from ._ipc import Channel
+from .ipc import Channel
 from .log import get_logger
 from .msg import (
     # Error,
@@ -52,8 +52,8 @@ from .msg import (
     Return,
 )
 from ._exceptions import (
-    # unpack_error,
     NoResult,
+    TransportClosed,
 )
 from ._context import (
     Context,
@@ -107,6 +107,10 @@ class Portal:
         # point.
         self._expect_result_ctx: Context|None = None
         self._streams: set[MsgStream] = set()
+
+        # TODO, this should be PRIVATE (and never used publicly)! since it's just
+        # a cached ref to the local runtime instead of calling
+        # `current_actor()` everywhere.. XD
         self.actor: Actor = current_actor()
 
     @property
@@ -171,7 +175,7 @@ class Portal:
         # not expecting a "main" result
         if self._expect_result_ctx is None:
             log.warning(
-                f"Portal for {self.channel.uid} not expecting a final"
+                f"Portal for {self.channel.aid} not expecting a final"
                 " result?\nresult() should only be called if subactor"
                 " was spawned with `ActorNursery.run_in_actor()`")
             return NoResult
@@ -218,7 +222,7 @@ class Portal:
         # IPC calls
         if self._streams:
             log.cancel(
-                f"Cancelling all streams with {self.channel.uid}")
+                f"Cancelling all streams with {self.channel.aid}")
             for stream in self._streams.copy():
                 try:
                     await stream.aclose()
@@ -263,7 +267,7 @@ class Portal:
             return False
 
         reminfo: str = (
-            f'c)=> {self.channel.uid}\n'
+            f'c)=> {self.channel.aid}\n'
             f'  |_{chan}\n'
         )
         log.cancel(
@@ -301,14 +305,34 @@ class Portal:
             return False
 
         except (
+            # XXX, should never really get raised unless we aren't
+            # wrapping them in the below type by mistake?
+            #
+            # Leaving the catch here for now until we're very sure
+            # all the cases (for various tpt protos) have indeed been
+            # re-wrapped ;p
             trio.ClosedResourceError,
             trio.BrokenResourceError,
-        ):
-            log.debug(
-                'IPC chan for actor already closed or broken?\n\n'
-                f'{self.channel.uid}\n'
+
+            TransportClosed,
+        ) as tpt_err:
+            report: str = (
+                f'IPC chan for actor already closed or broken?\n\n'
+                f'{self.channel.aid}\n'
                 f' |_{self.channel}\n'
             )
+            match tpt_err:
+                case TransportClosed():
+                    log.debug(report)
+                case _:
+                    report += (
+                        f'\n'
+                        f'Unhandled low-level transport-closed/error during\n'
+                        f'Portal.cancel_actor()` request?\n'
+                        f'<{type(tpt_err).__name__}( {tpt_err} )>\n'
+                    )
+                    log.warning(report)
+
             return False
 
     # TODO: do we still need this for low level `Actor`-runtime
@@ -504,8 +528,12 @@ class LocalPortal:
         return it's result.
 
         '''
-        obj = self.actor if ns == 'self' else importlib.import_module(ns)
-        func = getattr(obj, func_name)
+        obj = (
+            self.actor
+            if ns == 'self'
+            else importlib.import_module(ns)
+        )
+        func: Callable = getattr(obj, func_name)
         return await func(**kwargs)
 
 
@@ -543,17 +571,18 @@ async def open_portal(
             await channel.connect()
             was_connected = True
 
-        if channel.uid is None:
-            await actor._do_handshake(channel)
+        if channel.aid is None:
+            await channel._do_handshake(
+                aid=actor.aid,
+            )
 
         msg_loop_cs: trio.CancelScope|None = None
         if start_msg_loop:
-            from ._runtime import process_messages
+            from . import _rpc
             msg_loop_cs = await tn.start(
                 partial(
-                    process_messages,
-                    actor,
-                    channel,
+                    _rpc.process_messages,
+                    chan=channel,
                     # if the local task is cancelled we want to keep
                     # the msg loop running until our block ends
                     shield=True,

tractor/_root.py

@@ -18,7 +18,9 @@
 Root actor runtime ignition(s).
 
 '''
-from contextlib import asynccontextmanager as acm
+from contextlib import (
+    asynccontextmanager as acm,
+)
 from functools import partial
 import importlib
 import inspect
@@ -26,7 +28,10 @@ import logging
 import os
 import signal
 import sys
-from typing import Callable
+from typing import (
+    Any,
+    Callable,
+)
 import warnings
 
 
@@ -43,33 +48,111 @@ from .devx import _debug
 from . import _spawn
 from . import _state
 from . import log
-from ._ipc import _connect_chan
-from ._exceptions import is_multi_cancelled
-
-
-# set at startup and after forks
-_default_host: str = '127.0.0.1'
-_default_port: int = 1616
-
-# default registry always on localhost
-_default_lo_addrs: list[tuple[str, int]] = [(
-    _default_host,
-    _default_port,
-)]
+from .ipc import (
+    _connect_chan,
+)
+from ._addr import (
+    Address,
+    UnwrappedAddress,
+    default_lo_addrs,
+    mk_uuid,
+    wrap_address,
+)
+from ._exceptions import (
+    RuntimeFailure,
+    is_multi_cancelled,
+)
 
 
 logger = log.get_logger('tractor')
 
 
+# TODO: stick this in a `@acm` defined in `devx._debug`?
+# -[ ] also maybe consider making this a `wrapt`-deco to
+#     save an indent level?
+#
+@acm
+async def maybe_block_bp(
+    debug_mode: bool,
+    maybe_enable_greenback: bool,
+) -> bool:
+    # Override the global debugger hook to make it play nice with
+    # ``trio``, see much discussion in:
+    # https://github.com/python-trio/trio/issues/1155#issuecomment-742964018
+    builtin_bp_handler: Callable = sys.breakpointhook
+    orig_bp_path: str|None = os.environ.get(
+        'PYTHONBREAKPOINT',
+        None,
+    )
+    bp_blocked: bool
+    if (
+        debug_mode
+        and maybe_enable_greenback
+        and (
+            maybe_mod := await _debug.maybe_init_greenback(
+                raise_not_found=False,
+            )
+        )
+    ):
+        logger.info(
+            f'Found `greenback` installed @ {maybe_mod}\n'
+            'Enabling `tractor.pause_from_sync()` support!\n'
+        )
+        os.environ['PYTHONBREAKPOINT'] = (
+            'tractor.devx._debug._sync_pause_from_builtin'
+        )
+        _state._runtime_vars['use_greenback'] = True
+        bp_blocked = False
+
+    else:
+        # TODO: disable `breakpoint()` by default (without
+        # `greenback`) since it will break any multi-actor
+        # usage by a clobbered TTY's stdstreams!
+        def block_bps(*args, **kwargs):
+            raise RuntimeError(
+                'Trying to use `breakpoint()` eh?\n\n'
+                'Welp, `tractor` blocks `breakpoint()` built-in calls by default!\n'
+                'If you need to use it please install `greenback` and set '
+                '`debug_mode=True` when opening the runtime '
+                '(either via `.open_nursery()` or `open_root_actor()`)\n'
+            )
+
+        sys.breakpointhook = block_bps
+        # lol ok,
+        # https://docs.python.org/3/library/sys.html#sys.breakpointhook
+        os.environ['PYTHONBREAKPOINT'] = "0"
+        bp_blocked = True
+
+    try:
+        yield bp_blocked
+    finally:
+        # restore any prior built-in `breakpoint()` hook state
+        if builtin_bp_handler is not None:
+            sys.breakpointhook = builtin_bp_handler
+
+        if orig_bp_path is not None:
+            os.environ['PYTHONBREAKPOINT'] = orig_bp_path
+
+        else:
+            # clear env back to having no entry
+            os.environ.pop('PYTHONBREAKPOINT', None)
+
+
+
 @acm
 async def open_root_actor(
-
     *,
     # defaults are above
-    registry_addrs: list[tuple[str, int]]|None = None,
+    registry_addrs: list[UnwrappedAddress]|None = None,
 
     # defaults are above
-    arbiter_addr: tuple[str, int]|None = None,
+    arbiter_addr: tuple[UnwrappedAddress]|None = None,
+
+    enable_transports: list[
+        # TODO, this should eventually be the pairs as
+        # defined by (codec, proto) as on `MsgTransport.
+        _state.TransportProtocolKey,
+    ]|None = None,
 
     name: str|None = 'root',
 
@@ -111,350 +194,336 @@ async def open_root_actor(
     Runtime init entry point for ``tractor``.
 
     '''
-    _debug.hide_runtime_frames()
-    __tracebackhide__: bool = hide_tb
-
-    # TODO: stick this in a `@cm` defined in `devx._debug`?
-    #
-    # Override the global debugger hook to make it play nice with
-    # ``trio``, see much discussion in:
-    # https://github.com/python-trio/trio/issues/1155#issuecomment-742964018
-    builtin_bp_handler: Callable = sys.breakpointhook
-    orig_bp_path: str|None = os.environ.get(
-        'PYTHONBREAKPOINT',
-        None,
-    )
-    if (
-        debug_mode
-        and maybe_enable_greenback
-        and (
-            maybe_mod := await _debug.maybe_init_greenback(
-                raise_not_found=False,
-            )
+    # XXX NEVER allow nested actor-trees!
+    if already_actor := _state.current_actor(err_on_no_runtime=False):
+        rtvs: dict[str, Any] = _state._runtime_vars
+        root_mailbox: list[str, int] = rtvs['_root_mailbox']
+        registry_addrs: list[list[str, int]] = rtvs['_registry_addrs']
+        raise RuntimeFailure(
+            f'A current actor already exists !?\n'
+            f'({already_actor}\n'
+            f'\n'
+            f'You can NOT open a second root actor from within '
+            f'an existing tree and the current root of this '
+            f'already exists !!\n'
+            f'\n'
+            f'_root_mailbox: {root_mailbox!r}\n'
+            f'_registry_addrs: {registry_addrs!r}\n'
         )
+
+    async with maybe_block_bp(
+        debug_mode=debug_mode,
+        maybe_enable_greenback=maybe_enable_greenback,
     ):
-        logger.info(
-            f'Found `greenback` installed @ {maybe_mod}\n'
-            'Enabling `tractor.pause_from_sync()` support!\n'
-        )
-        os.environ['PYTHONBREAKPOINT'] = (
-            'tractor.devx._debug._sync_pause_from_builtin'
-        )
-        _state._runtime_vars['use_greenback'] = True
+        if enable_transports is None:
+            enable_transports: list[str] = _state.current_ipc_protos()
+        else:
+            _state._runtime_vars['_enable_tpts'] = enable_transports
 
-    else:
-        # TODO: disable `breakpoint()` by default (without
-        # `greenback`) since it will break any multi-actor
-        # usage by a clobbered TTY's stdstreams!
-        def block_bps(*args, **kwargs):
+        # TODO! support multi-tpts per actor!
+        # Bo
+        if not len(enable_transports) == 1:
             raise RuntimeError(
-                'Trying to use `breakpoint()` eh?\n\n'
-                'Welp, `tractor` blocks `breakpoint()` built-in calls by default!\n'
-                'If you need to use it please install `greenback` and set '
-                '`debug_mode=True` when opening the runtime '
-                '(either via `.open_nursery()` or `open_root_actor()`)\n'
+                f'No multi-tpt support yet!\n'
+                f'enable_transports={enable_transports!r}\n'
             )
 
-        sys.breakpointhook = block_bps
-        # lol ok,
-        # https://docs.python.org/3/library/sys.html#sys.breakpointhook
-        os.environ['PYTHONBREAKPOINT'] = "0"
+        _debug.hide_runtime_frames()
+        __tracebackhide__: bool = hide_tb
 
-    # attempt to retreive ``trio``'s sigint handler and stash it
-    # on our debugger lock state.
-    _debug.DebugStatus._trio_handler = signal.getsignal(signal.SIGINT)
+        # attempt to retreive ``trio``'s sigint handler and stash it
+        # on our debugger lock state.
+        _debug.DebugStatus._trio_handler = signal.getsignal(signal.SIGINT)
 
-    # mark top most level process as root actor
-    _state._runtime_vars['_is_root'] = True
+        # mark top most level process as root actor
+        _state._runtime_vars['_is_root'] = True
 
-    # caps based rpc list
-    enable_modules = (
-        enable_modules
-        or
-        []
-    )
-
-    if rpc_module_paths:
-        warnings.warn(
-            "`rpc_module_paths` is now deprecated, use "
-            " `enable_modules` instead.",
-            DeprecationWarning,
-            stacklevel=2,
+        # caps based rpc list
+        enable_modules = (
+            enable_modules
+            or
+            []
         )
-        enable_modules.extend(rpc_module_paths)
 
-    if start_method is not None:
-        _spawn.try_set_start_method(start_method)
+        if rpc_module_paths:
+            warnings.warn(
+                "`rpc_module_paths` is now deprecated, use "
+                " `enable_modules` instead.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+            enable_modules.extend(rpc_module_paths)
 
-    if arbiter_addr is not None:
-        warnings.warn(
-            '`arbiter_addr` is now deprecated\n'
-            'Use `registry_addrs: list[tuple]` instead..',
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        registry_addrs = [arbiter_addr]
+        if start_method is not None:
+            _spawn.try_set_start_method(start_method)
 
-    registry_addrs: list[tuple[str, int]] = (
-        registry_addrs
-        or
-        _default_lo_addrs
-    )
-    assert registry_addrs
+        # TODO! remove this ASAP!
+        if arbiter_addr is not None:
+            warnings.warn(
+                '`arbiter_addr` is now deprecated\n'
+                'Use `registry_addrs: list[tuple]` instead..',
+                DeprecationWarning,
+                stacklevel=2,
+            )
+            registry_addrs = [arbiter_addr]
 
-    loglevel = (
-        loglevel
-        or log._default_loglevel
-    ).upper()
+        if not registry_addrs:
+            registry_addrs: list[UnwrappedAddress] = default_lo_addrs(
+                enable_transports
+            )
 
-    if (
-        debug_mode
-        and _spawn._spawn_method == 'trio'
-    ):
-        _state._runtime_vars['_debug_mode'] = True
+        assert registry_addrs
 
-        # expose internal debug module to every actor allowing for
-        # use of ``await tractor.pause()``
-        enable_modules.append('tractor.devx._debug')
+        loglevel = (
+            loglevel
+            or log._default_loglevel
+        ).upper()
 
-        # if debug mode get's enabled *at least* use that level of
-        # logging for some informative console prompts.
         if (
-            logging.getLevelName(
-                # lul, need the upper case for the -> int map?
-                # sweet "dynamic function behaviour" stdlib...
-                loglevel,
-            ) > logging.getLevelName('PDB')
+            debug_mode
+            and _spawn._spawn_method == 'trio'
         ):
-            loglevel = 'PDB'
+            _state._runtime_vars['_debug_mode'] = True
+
+            # expose internal debug module to every actor allowing for
+            # use of ``await tractor.pause()``
+            enable_modules.append('tractor.devx._debug')
+
+            # if debug mode get's enabled *at least* use that level of
+            # logging for some informative console prompts.
+            if (
+                logging.getLevelName(
+                    # lul, need the upper case for the -> int map?
+                    # sweet "dynamic function behaviour" stdlib...
+                    loglevel,
+                ) > logging.getLevelName('PDB')
+            ):
+                loglevel = 'PDB'
 
 
-    elif debug_mode:
-        raise RuntimeError(
-            "Debug mode is only supported for the `trio` backend!"
-        )
-
-    assert loglevel
-    _log = log.get_console_log(loglevel)
-    assert _log
-
-    # TODO: factor this into `.devx._stackscope`!!
-    if (
-        debug_mode
-        and
-        enable_stack_on_sig
-    ):
-        from .devx._stackscope import enable_stack_on_sig
-        enable_stack_on_sig()
-
-    # closed into below ping task-func
-    ponged_addrs: list[tuple[str, int]] = []
-
-    async def ping_tpt_socket(
-        addr: tuple[str, int],
-        timeout: float = 1,
-    ) -> None:
-        '''
-        Attempt temporary connection to see if a registry is
-        listening at the requested address by a tranport layer
-        ping.
-
-        If a connection can't be made quickly we assume none no
-        server is listening at that addr.
-
-        '''
-        try:
-            # TODO: this connect-and-bail forces us to have to
-            # carefully rewrap TCP 104-connection-reset errors as
-            # EOF so as to avoid propagating cancel-causing errors
-            # to the channel-msg loop machinery. Likely it would
-            # be better to eventually have a "discovery" protocol
-            # with basic handshake instead?
-            with trio.move_on_after(timeout):
-                async with _connect_chan(*addr):
-                    ponged_addrs.append(addr)
-
-        except OSError:
-            # TODO: make this a "discovery" log level?
-            logger.info(
-                f'No actor registry found @ {addr}\n'
-            )
-
-    async with trio.open_nursery() as tn:
-        for addr in registry_addrs:
-            tn.start_soon(
-                ping_tpt_socket,
-                tuple(addr),  # TODO: just drop this requirement?
-            )
-
-    trans_bind_addrs: list[tuple[str, int]] = []
-
-    # Create a new local root-actor instance which IS NOT THE
-    # REGISTRAR
-    if ponged_addrs:
-        if ensure_registry:
+        elif debug_mode:
             raise RuntimeError(
-                 f'Failed to open `{name}`@{ponged_addrs}: '
-                'registry socket(s) already bound'
+                "Debug mode is only supported for the `trio` backend!"
             )
 
-        # we were able to connect to an arbiter
-        logger.info(
-            f'Registry(s) seem(s) to exist @ {ponged_addrs}'
-        )
+        assert loglevel
+        _log = log.get_console_log(loglevel)
+        assert _log
 
-        actor = Actor(
-            name=name or 'anonymous',
-            registry_addrs=ponged_addrs,
-            loglevel=loglevel,
-            enable_modules=enable_modules,
-        )
-        # DO NOT use the registry_addrs as the transport server
-        # addrs for this new non-registar, root-actor.
-        for host, port in ponged_addrs:
-            # NOTE: zero triggers dynamic OS port allocation
-            trans_bind_addrs.append((host, 0))
-
-    # Start this local actor as the "registrar", aka a regular
-    # actor who manages the local registry of "mailboxes" of
-    # other process-tree-local sub-actors.
-    else:
-
-        # NOTE that if the current actor IS THE REGISTAR, the
-        # following init steps are taken:
-        # - the tranport layer server is bound to each (host, port)
-        #   pair defined in provided registry_addrs, or the default.
-        trans_bind_addrs = registry_addrs
-
-        # - it is normally desirable for any registrar to stay up
-        #   indefinitely until either all registered (child/sub)
-        #   actors are terminated (via SC supervision) or,
-        #   a re-election process has taken place. 
-        # NOTE: all of ^ which is not implemented yet - see:
-        # https://github.com/goodboy/tractor/issues/216
-        # https://github.com/goodboy/tractor/pull/348
-        # https://github.com/goodboy/tractor/issues/296
-
-        actor = Arbiter(
-            name or 'registrar',
-            registry_addrs=registry_addrs,
-            loglevel=loglevel,
-            enable_modules=enable_modules,
-        )
-        # XXX, in case the root actor runtime was actually run from
-        # `tractor.to_asyncio.run_as_asyncio_guest()` and NOt
-        # `.trio.run()`.
-        actor._infected_aio = _state._runtime_vars['_is_infected_aio']
-
-    # Start up main task set via core actor-runtime nurseries.
-    try:
-        # assign process-local actor
-        _state._current_actor = actor
-
-        # start local channel-server and fake the portal API
-        # NOTE: this won't block since we provide the nursery
-        ml_addrs_str: str = '\n'.join(
-            f'@{addr}' for addr in trans_bind_addrs
-        )
-        logger.info(
-            f'Starting local {actor.uid} on the following transport addrs:\n'
-            f'{ml_addrs_str}'
-        )
-
-        # start the actor runtime in a new task
-        async with trio.open_nursery(
-            strict_exception_groups=False,
-            # ^XXX^ TODO? instead unpack any RAE as per "loose" style?
-        ) as nursery:
-
-            # ``_runtime.async_main()`` creates an internal nursery
-            # and blocks here until any underlying actor(-process)
-            # tree has terminated thereby conducting so called
-            # "end-to-end" structured concurrency throughout an
-            # entire hierarchical python sub-process set; all
-            # "actor runtime" primitives are SC-compat and thus all
-            # transitively spawned actors/processes must be as
-            # well.
-            await nursery.start(
-                partial(
-                    async_main,
-                    actor,
-                    accept_addrs=trans_bind_addrs,
-                    parent_addr=None
-                )
-            )
-            try:
-                yield actor
-            except (
-                Exception,
-                BaseExceptionGroup,
-            ) as err:
-
-                # TODO, in beginning to handle the subsubactor with
-                # crashed grandparent cases..
-                #
-                # was_locked: bool = await _debug.maybe_wait_for_debugger(
-                #     child_in_debug=True,
-                # )
-                # XXX NOTE XXX see equiv note inside
-                # `._runtime.Actor._stream_handler()` where in the
-                # non-root or root-that-opened-this-mahually case we
-                # wait for the local actor-nursery to exit before
-                # exiting the transport channel handler.
-                entered: bool = await _debug._maybe_enter_pm(
-                    err,
-                    api_frame=inspect.currentframe(),
-                    debug_filter=debug_filter,
-                )
-
-                if (
-                    not entered
-                    and
-                    not is_multi_cancelled(
-                        err,
-                    )
-                ):
-                    logger.exception('Root actor crashed\n')
-
-                # ALWAYS re-raise any error bubbled up from the
-                # runtime!
-                raise
-
-            finally:
-                # NOTE: not sure if we'll ever need this but it's
-                # possibly better for even more determinism?
-                # logger.cancel(
-                #     f'Waiting on {len(nurseries)} nurseries in root..')
-                # nurseries = actor._actoruid2nursery.values()
-                # async with trio.open_nursery() as tempn:
-                #     for an in nurseries:
-                #         tempn.start_soon(an.exited.wait)
-
-                logger.info(
-                    'Closing down root actor'
-                )
-                await actor.cancel(None)  # self cancel
-    finally:
-        _state._current_actor = None
-        _state._last_actor_terminated = actor
-
-        # restore built-in `breakpoint()` hook state
+        # TODO: factor this into `.devx._stackscope`!!
         if (
             debug_mode
             and
-            maybe_enable_greenback
+            enable_stack_on_sig
         ):
-            if builtin_bp_handler is not None:
-                sys.breakpointhook = builtin_bp_handler
+            from .devx._stackscope import enable_stack_on_sig
+            enable_stack_on_sig()
 
-            if orig_bp_path is not None:
-                os.environ['PYTHONBREAKPOINT'] = orig_bp_path
+        # closed into below ping task-func
+        ponged_addrs: list[UnwrappedAddress] = []
 
-            else:
-                # clear env back to having no entry
-                os.environ.pop('PYTHONBREAKPOINT', None)
+        async def ping_tpt_socket(
+            addr: UnwrappedAddress,
+            timeout: float = 1,
+        ) -> None:
+            '''
+            Attempt temporary connection to see if a registry is
+            listening at the requested address by a tranport layer
+            ping.
 
-        logger.runtime("Root actor terminated")
+            If a connection can't be made quickly we assume none no
+            server is listening at that addr.
+
+            '''
+            try:
+                # TODO: this connect-and-bail forces us to have to
+                # carefully rewrap TCP 104-connection-reset errors as
+                # EOF so as to avoid propagating cancel-causing errors
+                # to the channel-msg loop machinery. Likely it would
+                # be better to eventually have a "discovery" protocol
+                # with basic handshake instead?
+                with trio.move_on_after(timeout):
+                    async with _connect_chan(addr):
+                        ponged_addrs.append(addr)
+
+            except OSError:
+                # TODO: make this a "discovery" log level?
+                logger.info(
+                    f'No actor registry found @ {addr}\n'
+                )
+
+        async with trio.open_nursery() as tn:
+            for addr in registry_addrs:
+                tn.start_soon(
+                    ping_tpt_socket,
+                    addr,
+                )
+
+        trans_bind_addrs: list[UnwrappedAddress] = []
+
+        # Create a new local root-actor instance which IS NOT THE
+        # REGISTRAR
+        if ponged_addrs:
+            if ensure_registry:
+                raise RuntimeError(
+                     f'Failed to open `{name}`@{ponged_addrs}: '
+                    'registry socket(s) already bound'
+                )
+
+            # we were able to connect to an arbiter
+            logger.info(
+                f'Registry(s) seem(s) to exist @ {ponged_addrs}'
+            )
+
+            actor = Actor(
+                name=name or 'anonymous',
+                uuid=mk_uuid(),
+                registry_addrs=ponged_addrs,
+                loglevel=loglevel,
+                enable_modules=enable_modules,
+            )
+            # DO NOT use the registry_addrs as the transport server
+            # addrs for this new non-registar, root-actor.
+            for addr in ponged_addrs:
+                waddr: Address = wrap_address(addr)
+                trans_bind_addrs.append(
+                    waddr.get_random(bindspace=waddr.bindspace)
+                )
+
+        # Start this local actor as the "registrar", aka a regular
+        # actor who manages the local registry of "mailboxes" of
+        # other process-tree-local sub-actors.
+        else:
+
+            # NOTE that if the current actor IS THE REGISTAR, the
+            # following init steps are taken:
+            # - the tranport layer server is bound to each addr
+            #   pair defined in provided registry_addrs, or the default.
+            trans_bind_addrs = registry_addrs
+
+            # - it is normally desirable for any registrar to stay up
+            #   indefinitely until either all registered (child/sub)
+            #   actors are terminated (via SC supervision) or,
+            #   a re-election process has taken place.
+            # NOTE: all of ^ which is not implemented yet - see:
+            # https://github.com/goodboy/tractor/issues/216
+            # https://github.com/goodboy/tractor/pull/348
+            # https://github.com/goodboy/tractor/issues/296
+
+            actor = Arbiter(
+                name=name or 'registrar',
+                uuid=mk_uuid(),
+                registry_addrs=registry_addrs,
+                loglevel=loglevel,
+                enable_modules=enable_modules,
+            )
+            # XXX, in case the root actor runtime was actually run from
+            # `tractor.to_asyncio.run_as_asyncio_guest()` and NOt
+            # `.trio.run()`.
+            actor._infected_aio = _state._runtime_vars['_is_infected_aio']
+
+        # Start up main task set via core actor-runtime nurseries.
+        try:
+            # assign process-local actor
+            _state._current_actor = actor
+
+            # start local channel-server and fake the portal API
+            # NOTE: this won't block since we provide the nursery
+            ml_addrs_str: str = '\n'.join(
+                f'@{addr}' for addr in trans_bind_addrs
+            )
+            logger.info(
+                f'Starting local {actor.uid} on the following transport addrs:\n'
+                f'{ml_addrs_str}'
+            )
+
+            # start the actor runtime in a new task
+            async with trio.open_nursery(
+                strict_exception_groups=False,
+                # ^XXX^ TODO? instead unpack any RAE as per "loose" style?
+            ) as nursery:
+
+                # ``_runtime.async_main()`` creates an internal nursery
+                # and blocks here until any underlying actor(-process)
+                # tree has terminated thereby conducting so called
+                # "end-to-end" structured concurrency throughout an
+                # entire hierarchical python sub-process set; all
+                # "actor runtime" primitives are SC-compat and thus all
+                # transitively spawned actors/processes must be as
+                # well.
+                await nursery.start(
+                    partial(
+                        async_main,
+                        actor,
+                        accept_addrs=trans_bind_addrs,
+                        parent_addr=None
+                    )
+                )
+                try:
+                    yield actor
+                except (
+                    Exception,
+                    BaseExceptionGroup,
+                ) as err:
+
+                    # TODO, in beginning to handle the subsubactor with
+                    # crashed grandparent cases..
+                    #
+                    # was_locked: bool = await _debug.maybe_wait_for_debugger(
+                    #     child_in_debug=True,
+                    # )
+                    # XXX NOTE XXX see equiv note inside
+                    # `._runtime.Actor._stream_handler()` where in the
+                    # non-root or root-that-opened-this-mahually case we
+                    # wait for the local actor-nursery to exit before
+                    # exiting the transport channel handler.
+                    entered: bool = await _debug._maybe_enter_pm(
+                        err,
+                        api_frame=inspect.currentframe(),
+                        debug_filter=debug_filter,
+                    )
+
+                    if (
+                        not entered
+                        and
+                        not is_multi_cancelled(
+                            err,
+                        )
+                    ):
+                        logger.exception(
+                            'Root actor crashed\n'
+                            f'>x)\n'
+                            f' |_{actor}\n'
+                        )
+
+                    # ALWAYS re-raise any error bubbled up from the
+                    # runtime!
+                    raise
+
+                finally:
+                    # NOTE: not sure if we'll ever need this but it's
+                    # possibly better for even more determinism?
+                    # logger.cancel(
+                    #     f'Waiting on {len(nurseries)} nurseries in root..')
+                    # nurseries = actor._actoruid2nursery.values()
+                    # async with trio.open_nursery() as tempn:
+                    #     for an in nurseries:
+                    #         tempn.start_soon(an.exited.wait)
+
+                    logger.info(
+                        f'Closing down root actor\n'
+                        f'>)\n'
+                        f'|_{actor}\n'
+                    )
+                    await actor.cancel(None)  # self cancel
+        finally:
+            _state._current_actor = None
+            _state._last_actor_terminated = actor
+            logger.runtime(
+                f'Root actor terminated\n'
+                f')>\n'
+                f' |_{actor}\n'
+            )
 
 
 def run_daemon(
@@ -462,7 +531,7 @@ def run_daemon(
 
     # runtime kwargs
     name: str | None = 'root',
-    registry_addrs: list[tuple[str, int]] = _default_lo_addrs,
+    registry_addrs: list[UnwrappedAddress]|None = None,
 
     start_method: str | None = None,
     debug_mode: bool = False,

tractor/_rpc.py

@@ -42,7 +42,7 @@ from trio import (
     TaskStatus,
 )
 
-from ._ipc import Channel
+from .ipc import Channel
 from ._context import (
     Context,
 )
@@ -869,7 +869,6 @@ async def try_ship_error_to_remote(
 
 
 async def process_messages(
-    actor: Actor,
     chan: Channel,
     shield: bool = False,
     task_status: TaskStatus[CancelScope] = trio.TASK_STATUS_IGNORED,
@@ -907,6 +906,7 @@ async def process_messages(
       (as utilized inside `Portal.cancel_actor()` ).
 
     '''
+    actor: Actor = _state.current_actor()
     assert actor._service_n  # runtime state sanity
 
     # TODO: once `trio` get's an "obvious way" for req/resp we
@@ -1156,7 +1156,7 @@ async def process_messages(
                                 trio.Event(),
                             )
 
-                    # runtime-scoped remote (internal) error
+                    # XXX RUNTIME-SCOPED! remote (likely internal) error
                     # (^- bc no `Error.cid` -^)
                     #
                     # NOTE: this is the non-rpc error case, that
@@ -1219,8 +1219,10 @@ async def process_messages(
         # -[ ] figure out how this will break with other transports?
         tc.report_n_maybe_raise(
             message=(
-                f'peer IPC channel closed abruptly?\n\n'
-                f'<=x {chan}\n'
+                f'peer IPC channel closed abruptly?\n'
+                f'\n'
+                f'<=x[\n'
+                f'  {chan}\n'
                 f'  |_{chan.raddr}\n\n'
             )
             +

tractor/_spawn.py

@@ -46,19 +46,23 @@ from tractor._state import (
     _runtime_vars,
 )
 from tractor.log import get_logger
+from tractor._addr import UnwrappedAddress
 from tractor._portal import Portal
 from tractor._runtime import Actor
 from tractor._entry import _mp_main
 from tractor._exceptions import ActorFailure
 from tractor.msg.types import (
+    Aid,
     SpawnSpec,
 )
 
 
 if TYPE_CHECKING:
+    from ipc import IPCServer
     from ._supervise import ActorNursery
     ProcessType = TypeVar('ProcessType', mp.Process, trio.Process)
 
+
 log = get_logger('tractor')
 
 # placeholder for an mp start context if so using that backend
@@ -163,7 +167,7 @@ async def exhaust_portal(
         # TODO: merge with above?
         log.warning(
             'Cancelled portal result waiter task:\n'
-            f'uid: {portal.channel.uid}\n'
+            f'uid: {portal.channel.aid}\n'
             f'error: {err}\n'
         )
         return err
@@ -171,7 +175,7 @@ async def exhaust_portal(
     else:
         log.debug(
             f'Returning final result from portal:\n'
-            f'uid: {portal.channel.uid}\n'
+            f'uid: {portal.channel.aid}\n'
             f'result: {final}\n'
         )
         return final
@@ -324,12 +328,12 @@ async def soft_kill(
     see `.hard_kill()`).
 
     '''
-    uid: tuple[str, str] = portal.channel.uid
+    peer_aid: Aid = portal.channel.aid
     try:
         log.cancel(
             f'Soft killing sub-actor via portal request\n'
             f'\n'
-            f'(c=> {portal.chan.uid}\n'
+            f'(c=> {peer_aid}\n'
             f'  |_{proc}\n'
         )
         # wait on sub-proc to signal termination
@@ -378,7 +382,7 @@ async def soft_kill(
             if proc.poll() is None:  # type: ignore
                 log.warning(
                     'Subactor still alive after cancel request?\n\n'
-                    f'uid: {uid}\n'
+                    f'uid: {peer_aid}\n'
                     f'|_{proc}\n'
                 )
                 n.cancel_scope.cancel()
@@ -392,14 +396,15 @@ async def new_proc(
     errors: dict[tuple[str, str], Exception],
 
     # passed through to actor main
-    bind_addrs: list[tuple[str, int]],
-    parent_addr: tuple[str, int],
+    bind_addrs: list[UnwrappedAddress],
+    parent_addr: UnwrappedAddress,
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
 
     *,
 
     infect_asyncio: bool = False,
-    task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
+    task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED,
+    proc_kwargs: dict[str, any] = {}
 
 ) -> None:
 
@@ -419,6 +424,7 @@ async def new_proc(
         _runtime_vars,  # run time vars
         infect_asyncio=infect_asyncio,
         task_status=task_status,
+        proc_kwargs=proc_kwargs
     )
 
 
@@ -429,12 +435,13 @@ async def trio_proc(
     errors: dict[tuple[str, str], Exception],
 
     # passed through to actor main
-    bind_addrs: list[tuple[str, int]],
-    parent_addr: tuple[str, int],
+    bind_addrs: list[UnwrappedAddress],
+    parent_addr: UnwrappedAddress,
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
     *,
     infect_asyncio: bool = False,
-    task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
+    task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED,
+    proc_kwargs: dict[str, any] = {}
 
 ) -> None:
     '''
@@ -456,6 +463,9 @@ async def trio_proc(
         # the OS; it otherwise can be passed via the parent channel if
         # we prefer in the future (for privacy).
         "--uid",
+        # TODO, how to pass this over "wire" encodings like
+        # cmdline args?
+        # -[ ] maybe we can add an `Aid.min_tuple()` ?
         str(subactor.uid),
         # Address the child must connect to on startup
         "--parent_addr",
@@ -473,9 +483,10 @@ async def trio_proc(
 
     cancelled_during_spawn: bool = False
     proc: trio.Process|None = None
+    ipc_server: IPCServer = actor_nursery._actor.ipc_server
     try:
         try:
-            proc: trio.Process = await trio.lowlevel.open_process(spawn_cmd)
+            proc: trio.Process = await trio.lowlevel.open_process(spawn_cmd, **proc_kwargs)
             log.runtime(
                 'Started new child\n'
                 f'|_{proc}\n'
@@ -484,7 +495,7 @@ async def trio_proc(
             # wait for actor to spawn and connect back to us
             # channel should have handshake completed by the
             # local actor by the time we get a ref to it
-            event, chan = await actor_nursery._actor.wait_for_peer(
+            event, chan = await ipc_server.wait_for_peer(
                 subactor.uid
             )
 
@@ -517,15 +528,15 @@ async def trio_proc(
 
         # send a "spawning specification" which configures the
         # initial runtime state of the child.
-        await chan.send(
-            SpawnSpec(
-                _parent_main_data=subactor._parent_main_data,
-                enable_modules=subactor.enable_modules,
-                reg_addrs=subactor.reg_addrs,
-                bind_addrs=bind_addrs,
-                _runtime_vars=_runtime_vars,
-            )
+        sspec = SpawnSpec(
+            _parent_main_data=subactor._parent_main_data,
+            enable_modules=subactor.enable_modules,
+            reg_addrs=subactor.reg_addrs,
+            bind_addrs=bind_addrs,
+            _runtime_vars=_runtime_vars,
         )
+        log.runtime(f'Sending spawn spec: {str(sspec)}')
+        await chan.send(sspec)
 
         # track subactor in current nursery
         curr_actor: Actor = current_actor()
@@ -635,12 +646,13 @@ async def mp_proc(
     subactor: Actor,
     errors: dict[tuple[str, str], Exception],
     # passed through to actor main
-    bind_addrs: list[tuple[str, int]],
-    parent_addr: tuple[str, int],
+    bind_addrs: list[UnwrappedAddress],
+    parent_addr: UnwrappedAddress,
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
     *,
     infect_asyncio: bool = False,
-    task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
+    task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED,
+    proc_kwargs: dict[str, any] = {}
 
 ) -> None:
 
@@ -715,12 +727,14 @@ async def mp_proc(
 
     log.runtime(f"Started {proc}")
 
+    ipc_server: IPCServer = actor_nursery._actor.ipc_server
     try:
         # wait for actor to spawn and connect back to us
         # channel should have handshake completed by the
         # local actor by the time we get a ref to it
-        event, chan = await actor_nursery._actor.wait_for_peer(
-            subactor.uid)
+        event, chan = await ipc_server.wait_for_peer(
+            subactor.uid,
+        )
 
         # XXX: monkey patch poll API to match the ``subprocess`` API..
         # not sure why they don't expose this but kk.

tractor/_state.py

@@ -14,16 +14,19 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-"""
-Per process state
+'''
+Per actor-process runtime state mgmt APIs.
 
-"""
+'''
 from __future__ import annotations
 from contextvars import (
     ContextVar,
 )
+import os
+from pathlib import Path
 from typing import (
     Any,
+    Literal,
     TYPE_CHECKING,
 )
 
@@ -34,14 +37,28 @@ if TYPE_CHECKING:
     from ._context import Context
 
 
+# default IPC transport protocol settings
+TransportProtocolKey = Literal[
+    'tcp',
+    'uds',
+]
+_def_tpt_proto: TransportProtocolKey = 'tcp'
+
 _current_actor: Actor|None = None  # type: ignore # noqa
 _last_actor_terminated: Actor|None = None
 
 # TODO: mk this a `msgspec.Struct`!
 _runtime_vars: dict[str, Any] = {
     '_debug_mode': False,
-    '_is_root': False,
-    '_root_mailbox': (None, None),
+    # root of actor-process tree info
+    '_is_root': False,  # bool
+    '_root_mailbox': (None, None),  # tuple[str|None, str|None]
+    '_root_addrs': [],  # tuple[str|None, str|None]
+
+    # parent->chld ipc protocol caps
+    '_enable_tpts': [_def_tpt_proto],
+
+    # registrar info
     '_registry_addrs': [],
 
     '_is_infected_aio': False,
@@ -99,7 +116,7 @@ def current_actor(
     return _current_actor
 
 
-def is_main_process() -> bool:
+def is_root_process() -> bool:
     '''
     Bool determining if this actor is running in the top-most process.
 
@@ -108,8 +125,10 @@ def is_main_process() -> bool:
     return mp.current_process().name == 'MainProcess'
 
 
-# TODO, more verby name?
-def debug_mode() -> bool:
+is_main_process = is_root_process
+
+
+def is_debug_mode() -> bool:
     '''
     Bool determining if "debug mode" is on which enables
     remote subactor pdb entry on crashes.
@@ -118,6 +137,9 @@ def debug_mode() -> bool:
     return bool(_runtime_vars['_debug_mode'])
 
 
+debug_mode = is_debug_mode
+
+
 def is_root_process() -> bool:
     return _runtime_vars['_is_root']
 
@@ -143,3 +165,34 @@ def current_ipc_ctx(
             f'|_{current_task()}\n'
         )
     return ctx
+
+
+# std ODE (mutable) app state location
+_rtdir: Path = Path(os.environ['XDG_RUNTIME_DIR'])
+
+
+def get_rt_dir(
+    subdir: str = 'tractor'
+) -> Path:
+    '''
+    Return the user "runtime dir" where most userspace apps stick
+    their IPC and cache related system util-files; we take hold
+    of a `'XDG_RUNTIME_DIR'/tractor/` subdir by default.
+
+    '''
+    rtdir: Path = _rtdir / subdir
+    if not rtdir.is_dir():
+        rtdir.mkdir()
+    return rtdir
+
+
+def current_ipc_protos() -> list[str]:
+    '''
+    Return the list of IPC transport protocol keys currently
+    in use by this actor.
+
+    The keys are as declared by `MsgTransport` and `Address`
+    concrete-backend sub-types defined throughout `tractor.ipc`.
+
+    '''
+    return _runtime_vars['_enable_tpts']

tractor/_streaming.py

@@ -56,7 +56,7 @@ from tractor.msg import (
 if TYPE_CHECKING:
     from ._runtime import Actor
     from ._context import Context
-    from ._ipc import Channel
+    from .ipc import Channel
 
 
 log = get_logger(__name__)
@@ -437,22 +437,23 @@ class MsgStream(trio.abc.Channel):
             message: str = (
                 f'Stream self-closed by {this_side!r}-side before EoC from {peer_side!r}\n'
                 # } bc a stream is a "scope"/msging-phase inside an IPC
-                f'x}}>\n'
+                f'c}}>\n'
                 f'  |_{self}\n'
             )
-            log.cancel(message)
-            self._eoc = trio.EndOfChannel(message)
-
             if (
                 (rx_chan := self._rx_chan)
                 and
                 (stats := rx_chan.statistics()).tasks_waiting_receive
             ):
-                log.cancel(
-                    f'Msg-stream is closing but there is still reader tasks,\n'
+                message += (
+                    f'AND there is still reader tasks,\n'
+                    f'\n'
                     f'{stats}\n'
                 )
 
+            log.cancel(message)
+            self._eoc = trio.EndOfChannel(message)
+
         # ?XXX WAIT, why do we not close the local mem chan `._rx_chan` XXX?
         # => NO, DEFINITELY NOT! <=
         # if we're a bi-dir `MsgStream` BECAUSE this same
@@ -595,8 +596,17 @@ class MsgStream(trio.abc.Channel):
             trio.ClosedResourceError,
             trio.BrokenResourceError,
             BrokenPipeError,
-        ) as trans_err:
-            if hide_tb:
+        ) as _trans_err:
+            trans_err = _trans_err
+            if (
+                hide_tb
+                and
+                self._ctx.chan._exc is trans_err
+                # ^XXX, IOW, only if the channel is marked errored
+                # for the same reason as whatever its underlying
+                # transport raised, do we keep the full low-level tb
+                # suppressed from the user.
+            ):
                 raise type(trans_err)(
                     *trans_err.args
                 ) from trans_err
@@ -802,13 +812,12 @@ async def open_stream_from_ctx(
                 # sanity, can remove?
                 assert eoc is stream._eoc
 
-                log.warning(
+                log.runtime(
                     'Stream was terminated by EoC\n\n'
                     # NOTE: won't show the error <Type> but
                     # does show txt followed by IPC msg.
                     f'{str(eoc)}\n'
                 )
-
         finally:
             if ctx._portal:
                 try:

tractor/_supervise.py

@@ -22,13 +22,20 @@ from contextlib import asynccontextmanager as acm
 from functools import partial
 import inspect
 from pprint import pformat
-from typing import TYPE_CHECKING
+from typing import (
+    TYPE_CHECKING,
+)
 import typing
 import warnings
 
 import trio
 
+
 from .devx._debug import maybe_wait_for_debugger
+from ._addr import (
+    UnwrappedAddress,
+    mk_uuid,
+)
 from ._state import current_actor, is_main_process
 from .log import get_logger, get_loglevel
 from ._runtime import Actor
@@ -37,18 +44,21 @@ from ._exceptions import (
     is_multi_cancelled,
     ContextCancelled,
 )
-from ._root import open_root_actor
+from ._root import (
+    open_root_actor,
+)
 from . import _state
 from . import _spawn
 
 
 if TYPE_CHECKING:
     import multiprocessing as mp
+    # from .ipc._server import IPCServer
+    from .ipc import IPCServer
+
 
 log = get_logger(__name__)
 
-_default_bind_addr: tuple[str, int] = ('127.0.0.1', 0)
-
 
 class ActorNursery:
     '''
@@ -130,8 +140,9 @@ class ActorNursery:
 
         *,
 
-        bind_addrs: list[tuple[str, int]] = [_default_bind_addr],
+        bind_addrs: list[UnwrappedAddress]|None = None,
         rpc_module_paths: list[str]|None = None,
+        enable_transports: list[str] = [_state._def_tpt_proto],
         enable_modules: list[str]|None = None,
         loglevel: str|None = None,  # set log level per subactor
         debug_mode: bool|None = None,
@@ -141,6 +152,7 @@ class ActorNursery:
         # a `._ria_nursery` since the dependent APIs have been
         # removed!
         nursery: trio.Nursery|None = None,
+        proc_kwargs: dict[str, any] = {}
 
     ) -> Portal:
         '''
@@ -177,7 +189,9 @@ class ActorNursery:
             enable_modules.extend(rpc_module_paths)
 
         subactor = Actor(
-            name,
+            name=name,
+            uuid=mk_uuid(),
+
             # modules allowed to invoked funcs from
             enable_modules=enable_modules,
             loglevel=loglevel,
@@ -185,7 +199,7 @@ class ActorNursery:
             # verbatim relay this actor's registrar addresses
             registry_addrs=current_actor().reg_addrs,
         )
-        parent_addr = self._actor.accept_addr
+        parent_addr: UnwrappedAddress = self._actor.accept_addr
         assert parent_addr
 
         # start a task to spawn a process
@@ -204,6 +218,7 @@ class ActorNursery:
                 parent_addr,
                 _rtv,  # run time vars
                 infect_asyncio=infect_asyncio,
+                proc_kwargs=proc_kwargs
             )
         )
 
@@ -222,11 +237,12 @@ class ActorNursery:
         *,
 
         name: str | None = None,
-        bind_addrs: tuple[str, int] = [_default_bind_addr],
+        bind_addrs: UnwrappedAddress|None = None,
         rpc_module_paths: list[str] | None = None,
         enable_modules: list[str] | None = None,
         loglevel: str | None = None,  # set log level per subactor
         infect_asyncio: bool = False,
+        proc_kwargs: dict[str, any] = {},
 
         **kwargs,  # explicit args to ``fn``
 
@@ -257,6 +273,7 @@ class ActorNursery:
             # use the run_in_actor nursery
             nursery=self._ria_nursery,
             infect_asyncio=infect_asyncio,
+            proc_kwargs=proc_kwargs
         )
 
         # XXX: don't allow stream funcs
@@ -301,8 +318,13 @@ class ActorNursery:
         children: dict = self._children
         child_count: int = len(children)
         msg: str = f'Cancelling actor nursery with {child_count} children\n'
+
+        server: IPCServer = self._actor.ipc_server
+
         with trio.move_on_after(3) as cs:
-            async with trio.open_nursery() as tn:
+            async with trio.open_nursery(
+                strict_exception_groups=False,
+            ) as tn:
 
                 subactor: Actor
                 proc: trio.Process
@@ -321,7 +343,7 @@ class ActorNursery:
 
                     else:
                         if portal is None:  # actor hasn't fully spawned yet
-                            event = self._actor._peer_connected[subactor.uid]
+                            event: trio.Event = server._peer_connected[subactor.uid]
                             log.warning(
                                 f"{subactor.uid} never 't finished spawning?"
                             )
@@ -337,7 +359,7 @@ class ActorNursery:
                             if portal is None:
                                 # cancelled while waiting on the event
                                 # to arrive
-                                chan = self._actor._peers[subactor.uid][-1]
+                                chan = server._peers[subactor.uid][-1]
                                 if chan:
                                     portal = Portal(chan)
                                 else:  # there's no other choice left

tractor/_testing/samples.py

@@ -0,0 +1,35 @@
+import os
+import random
+
+
+def generate_sample_messages(
+    amount: int,
+    rand_min: int = 0,
+    rand_max: int = 0,
+    silent: bool = False
+) -> tuple[list[bytes], int]:
+
+    msgs = []
+    size = 0
+
+    if not silent:
+        print(f'\ngenerating {amount} messages...')
+
+    for i in range(amount):
+        msg = f'[{i:08}]'.encode('utf-8')
+
+        if rand_max > 0:
+            msg += os.urandom(
+                random.randint(rand_min, rand_max))
+
+        size += len(msg)
+
+        msgs.append(msg)
+
+        if not silent and i and i % 10_000 == 0:
+            print(f'{i} generated')
+
+    if not silent:
+        print(f'done, {size:,} bytes in total')
+
+    return msgs, size

tractor/devx/_debug.py

@@ -73,6 +73,7 @@ from tractor.log import get_logger
 from tractor._context import Context
 from tractor import _state
 from tractor._exceptions import (
+    DebugRequestError,
     InternalError,
     NoRuntime,
     is_multi_cancelled,
@@ -91,7 +92,11 @@ from tractor._state import (
 if TYPE_CHECKING:
     from trio.lowlevel import Task
     from threading import Thread
-    from tractor._ipc import Channel
+    from tractor.ipc import (
+        Channel,
+        IPCServer,
+        # _server,  # TODO? export at top level?
+    )
     from tractor._runtime import (
         Actor,
     )
@@ -1433,6 +1438,7 @@ def any_connected_locker_child() -> bool:
 
     '''
     actor: Actor = current_actor()
+    server: IPCServer = actor.ipc_server
 
     if not is_root_process():
         raise InternalError('This is a root-actor only API!')
@@ -1442,7 +1448,7 @@ def any_connected_locker_child() -> bool:
         and
         (uid_in_debug := ctx.chan.uid)
     ):
-        chans: list[tractor.Channel] = actor._peers.get(
+        chans: list[tractor.Channel] = server._peers.get(
             tuple(uid_in_debug)
         )
         if chans:
@@ -1740,13 +1746,6 @@ def sigint_shield(
 _pause_msg: str = 'Opening a pdb REPL in paused actor'
 
 
-class DebugRequestError(RuntimeError):
-    '''
-    Failed to request stdio lock from root actor!
-
-    '''
-
-
 _repl_fail_msg: str|None = (
     'Failed to REPl via `_pause()` '
 )
@@ -3009,6 +3008,7 @@ async def _maybe_enter_pm(
         [BaseException|BaseExceptionGroup],
         bool,
     ] = lambda err: not is_multi_cancelled(err),
+    **_pause_kws,
 
 ):
     if (
@@ -3035,6 +3035,7 @@ async def _maybe_enter_pm(
         await post_mortem(
             api_frame=api_frame,
             tb=tb,
+            **_pause_kws,
         )
         return True
 

tractor/devx/_stackscope.py

@@ -237,7 +237,7 @@ def enable_stack_on_sig(
     try:
         import stackscope
     except ImportError:
-        log.warning(
+        log.error(
             '`stackscope` not installed for use in debug mode!'
         )
         return None
@@ -255,8 +255,8 @@ def enable_stack_on_sig(
         dump_tree_on_sig,
     )
     log.devx(
-        'Enabling trace-trees on `SIGUSR1` '
-        'since `stackscope` is installed @ \n'
+        f'Enabling trace-trees on `SIGUSR1` '
+        f'since `stackscope` is installed @ \n'
         f'{stackscope!r}\n\n'
         f'With `SIGUSR1` handler\n'
         f'|_{dump_tree_on_sig}\n'

tractor/devx/pformat.py

@@ -19,6 +19,7 @@ Pretty formatters for use throughout the code base.
 Mostly handy for logging and exception message content.
 
 '''
+import sys
 import textwrap
 import traceback
 
@@ -115,6 +116,85 @@ def pformat_boxed_tb(
     )
 
 
+def pformat_exc(
+    exc: Exception,
+    header: str = '',
+    message: str = '',
+    body: str = '',
+    with_type_header: bool = True,
+) -> str:
+
+    # XXX when the currently raised exception is this instance,
+    # we do not ever use the "type header" style repr.
+    is_being_raised: bool = False
+    if (
+        (curr_exc := sys.exception())
+        and
+        curr_exc is exc
+    ):
+        is_being_raised: bool = True
+
+    with_type_header: bool = (
+        with_type_header
+        and
+        not is_being_raised
+    )
+
+    # <RemoteActorError( .. )> style
+    if (
+        with_type_header
+        and
+        not header
+    ):
+        header: str = f'<{type(exc).__name__}('
+
+    message: str = (
+        message
+        or
+        exc.message
+    )
+    if message:
+        # split off the first line so, if needed, it isn't
+        # indented the same like the "boxed content" which
+        # since there is no `.tb_str` is just the `.message`.
+        lines: list[str] = message.splitlines()
+        first: str = lines[0]
+        message: str = message.removeprefix(first)
+
+        # with a type-style header we,
+        # - have no special message "first line" extraction/handling
+        # - place the message a space in from the header:
+        #  `MsgTypeError( <message> ..`
+        #                 ^-here
+        # - indent the `.message` inside the type body.
+        if with_type_header:
+            first = f' {first} )>'
+
+        message: str = textwrap.indent(
+            message,
+            prefix=' '*2,
+        )
+        message: str = first + message
+
+    tail: str = ''
+    if (
+        with_type_header
+        and
+        not message
+    ):
+        tail: str = '>'
+
+    return (
+        header
+        +
+        message
+        +
+        f'{body}'
+        +
+        tail
+    )
+
+
 def pformat_caller_frame(
     stack_limit: int = 1,
     box_tb: bool = True,

tractor/experimental/_pubsub.py

@@ -45,6 +45,8 @@ __all__ = ['pub']
 log = get_logger('messaging')
 
 
+# TODO! this needs to reworked to use the modern
+# `Context`/`MsgStream` APIs!!
 async def fan_out_to_ctxs(
     pub_async_gen_func: typing.Callable,  # it's an async gen ... gd mypy
     topics2ctxs: dict[str, list],

tractor/ipc/__init__.py

@@ -0,0 +1,24 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+'''
+A modular IPC layer supporting the power of cross-process SC!
+
+'''
+from ._chan import (
+    _connect_chan as _connect_chan,
+    Channel as Channel
+)

tractor/ipc/_chan.py

@@ -0,0 +1,457 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+"""
+Inter-process comms abstractions
+
+"""
+from __future__ import annotations
+from collections.abc import AsyncGenerator
+from contextlib import (
+    asynccontextmanager as acm,
+    contextmanager as cm,
+)
+import platform
+from pprint import pformat
+import typing
+from typing import (
+    Any,
+    TYPE_CHECKING,
+)
+import warnings
+
+import trio
+
+from ._types import (
+    transport_from_addr,
+    transport_from_stream,
+)
+from tractor._addr import (
+    is_wrapped_addr,
+    wrap_address,
+    Address,
+    UnwrappedAddress,
+)
+from tractor.log import get_logger
+from tractor._exceptions import (
+    MsgTypeError,
+    pack_from_raise,
+    TransportClosed,
+)
+from tractor.msg import (
+    Aid,
+    MsgCodec,
+)
+
+if TYPE_CHECKING:
+    from ._transport import MsgTransport
+
+
+log = get_logger(__name__)
+
+_is_windows = platform.system() == 'Windows'
+
+
+class Channel:
+    '''
+    An inter-process channel for communication between (remote) actors.
+
+    Wraps a ``MsgStream``: transport + encoding IPC connection.
+
+    Currently we only support ``trio.SocketStream`` for transport
+    (aka TCP) and the ``msgpack`` interchange format via the ``msgspec``
+    codec libary.
+
+    '''
+    def __init__(
+
+        self,
+        transport: MsgTransport|None = None,
+        # TODO: optional reconnection support?
+        # auto_reconnect: bool = False,
+        # on_reconnect: typing.Callable[..., typing.Awaitable] = None,
+
+    ) -> None:
+
+        # self._recon_seq = on_reconnect
+        # self._autorecon = auto_reconnect
+
+        # Either created in ``.connect()`` or passed in by
+        # user in ``.from_stream()``.
+        self._transport: MsgTransport|None = transport
+
+        # set after handshake - always info from peer end
+        self.aid: Aid|None = None
+
+        self._aiter_msgs = self._iter_msgs()
+        self._exc: Exception|None = None
+        # ^XXX! ONLY set if a remote actor sends an `Error`-msg
+        self._closed: bool = False
+
+        # flag set by ``Portal.cancel_actor()`` indicating remote
+        # (possibly peer) cancellation of the far end actor
+        # runtime.
+        self._cancel_called: bool = False
+
+    @property
+    def uid(self) -> tuple[str, str]:
+        '''
+        Peer actor's unique id.
+
+        '''
+        msg: str = (
+            f'`{type(self).__name__}.uid` is now deprecated.\n'
+            'Use the new `.aid: tractor.msg.Aid` (struct) instead '
+            'which also provides additional named (optional) fields '
+            'beyond just the `.name` and `.uuid`.'
+        )
+        warnings.warn(
+            msg,
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        peer_aid: Aid = self.aid
+        return (
+            peer_aid.name,
+            peer_aid.uuid,
+        )
+
+    @property
+    def stream(self) -> trio.abc.Stream | None:
+        return self._transport.stream if self._transport else None
+
+    @property
+    def msgstream(self) -> MsgTransport:
+        log.info(
+            '`Channel.msgstream` is an old name, use `._transport`'
+        )
+        return self._transport
+
+    @property
+    def transport(self) -> MsgTransport:
+        return self._transport
+
+    @classmethod
+    def from_stream(
+        cls,
+        stream: trio.abc.Stream,
+    ) -> Channel:
+        transport_cls = transport_from_stream(stream)
+        return Channel(
+            transport=transport_cls(stream)
+        )
+
+    @classmethod
+    async def from_addr(
+        cls,
+        addr: UnwrappedAddress,
+        **kwargs
+    ) -> Channel:
+
+        if not is_wrapped_addr(addr):
+            addr: Address = wrap_address(addr)
+
+        transport_cls = transport_from_addr(addr)
+        transport = await transport_cls.connect_to(
+            addr,
+            **kwargs,
+        )
+        assert transport.raddr == addr
+        chan = Channel(transport=transport)
+        log.runtime(
+            f'Connected channel IPC transport\n'
+            f'[>\n'
+            f' |_{chan}\n'
+        )
+        return chan
+
+    @cm
+    def apply_codec(
+        self,
+        codec: MsgCodec,
+    ) -> None:
+        '''
+        Temporarily override the underlying IPC msg codec for
+        dynamic enforcement of messaging schema.
+
+        '''
+        orig: MsgCodec = self._transport.codec
+        try:
+            self._transport.codec = codec
+            yield
+        finally:
+            self._transport.codec = orig
+
+    # TODO: do a .src/.dst: str for maddrs?
+    def pformat(self) -> str:
+        if not self._transport:
+            return '<Channel with inactive transport?>'
+
+        tpt: MsgTransport = self._transport
+        tpt_name: str = type(tpt).__name__
+        tpt_status: str = (
+            'connected' if self.connected()
+            else 'closed'
+        )
+        return (
+            f'<Channel(\n'
+            f' |_status: {tpt_status!r}\n'
+            f'   _closed={self._closed}\n'
+            f'   _cancel_called={self._cancel_called}\n'
+            f'\n'
+            f' |_peer: {self.aid}\n'
+            f'\n'
+            f' |_msgstream: {tpt_name}\n'
+            f'   proto={tpt.laddr.proto_key!r}\n'
+            f'   layer={tpt.layer_key!r}\n'
+            f'   laddr={tpt.laddr}\n'
+            f'   raddr={tpt.raddr}\n'
+            f'   codec={tpt.codec_key!r}\n'
+            f'   stream={tpt.stream}\n'
+            f'   maddr={tpt.maddr!r}\n'
+            f'   drained={tpt.drained}\n'
+            f'   _send_lock={tpt._send_lock.statistics()}\n'
+            f')>\n'
+        )
+
+    # NOTE: making this return a value that can be passed to
+    # `eval()` is entirely **optional** FYI!
+    # https://docs.python.org/3/library/functions.html#repr
+    # https://docs.python.org/3/reference/datamodel.html#object.__repr__
+    #
+    # Currently we target **readability** from a (console)
+    # logging perspective over `eval()`-ability since we do NOT
+    # target serializing non-struct instances!
+    # def __repr__(self) -> str:
+    __str__ = pformat
+    __repr__ = pformat
+
+    @property
+    def laddr(self) -> Address|None:
+        return self._transport.laddr if self._transport else None
+
+    @property
+    def raddr(self) -> Address|None:
+        return self._transport.raddr if self._transport else None
+
+    # TODO: something like,
+    # `pdbp.hideframe_on(errors=[MsgTypeError])`
+    # instead of the `try/except` hack we have rn..
+    # seems like a pretty useful thing to have in general
+    # along with being able to filter certain stack frame(s / sets)
+    # possibly based on the current log-level?
+    async def send(
+        self,
+        payload: Any,
+
+        hide_tb: bool = True,
+
+    ) -> None:
+        '''
+        Send a coded msg-blob over the transport.
+
+        '''
+        __tracebackhide__: bool = hide_tb
+        try:
+            log.transport(
+                '=> send IPC msg:\n\n'
+                f'{pformat(payload)}\n'
+            )
+            # assert self._transport  # but why typing?
+            await self._transport.send(
+                payload,
+                hide_tb=hide_tb,
+            )
+        except (
+            BaseException,
+            MsgTypeError,
+            TransportClosed,
+        )as _err:
+            err = _err  # bind for introspection
+            match err:
+                case MsgTypeError():
+                    try:
+                        assert err.cid
+                    except KeyError:
+                        raise err
+                case TransportClosed():
+                    log.transport(
+                        f'Transport stream closed due to\n'
+                        f'{err.repr_src_exc()}\n'
+                    )
+
+                case _:
+                    # never suppress non-tpt sources
+                    __tracebackhide__: bool = False
+            raise
+
+    async def recv(self) -> Any:
+        assert self._transport
+        return await self._transport.recv()
+
+        # TODO: auto-reconnect features like 0mq/nanomsg?
+        # -[ ] implement it manually with nods to SC prot
+        #      possibly on multiple transport backends?
+        #  -> seems like that might be re-inventing scalability
+        #     prots tho no?
+        # try:
+        #     return await self._transport.recv()
+        # except trio.BrokenResourceError:
+        #     if self._autorecon:
+        #         await self._reconnect()
+        #         return await self.recv()
+        #     raise
+
+    async def aclose(self) -> None:
+
+        log.transport(
+            f'Closing channel to {self.aid} '
+            f'{self.laddr} -> {self.raddr}'
+        )
+        assert self._transport
+        await self._transport.stream.aclose()
+        self._closed = True
+
+    async def __aenter__(self):
+        await self.connect()
+        return self
+
+    async def __aexit__(self, *args):
+        await self.aclose(*args)
+
+    def __aiter__(self):
+        return self._aiter_msgs
+
+    # ?TODO? run any reconnection sequence?
+    # -[ ] prolly should be impl-ed as deco-API?
+    #
+    # async def _reconnect(self) -> None:
+    #     """Handle connection failures by polling until a reconnect can be
+    #     established.
+    #     """
+    #     down = False
+    #     while True:
+    #         try:
+    #             with trio.move_on_after(3) as cancel_scope:
+    #                 await self.connect()
+    #             cancelled = cancel_scope.cancelled_caught
+    #             if cancelled:
+    #                 log.transport(
+    #                     "Reconnect timed out after 3 seconds, retrying...")
+    #                 continue
+    #             else:
+    #                 log.transport("Stream connection re-established!")
+
+    #                 # on_recon = self._recon_seq
+    #                 # if on_recon:
+    #                 #     await on_recon(self)
+
+    #                 break
+    #         except (OSError, ConnectionRefusedError):
+    #             if not down:
+    #                 down = True
+    #                 log.transport(
+    #                     f"Connection to {self.raddr} went down, waiting"
+    #                     " for re-establishment")
+    #             await trio.sleep(1)
+
+    async def _iter_msgs(
+        self
+    ) -> AsyncGenerator[Any, None]:
+        '''
+        Yield `MsgType` IPC msgs decoded and deliverd from
+        an underlying `MsgTransport` protocol.
+
+        This is a streaming routine alo implemented as an async-gen
+        func (same a `MsgTransport._iter_pkts()`) gets allocated by
+        a `.__call__()` inside `.__init__()` where it is assigned to
+        the `._aiter_msgs` attr.
+
+        '''
+        assert self._transport
+        while True:
+            try:
+                async for msg in self._transport:
+                    match msg:
+                        # NOTE: if transport/interchange delivers
+                        # a type error, we pack it with the far
+                        # end peer `Actor.uid` and relay the
+                        # `Error`-msg upward to the `._rpc` stack
+                        # for normal RAE handling.
+                        case MsgTypeError():
+                            yield pack_from_raise(
+                                local_err=msg,
+                                cid=msg.cid,
+
+                                # XXX we pack it here bc lower
+                                # layers have no notion of an
+                                # actor-id ;)
+                                src_uid=self.uid,
+                            )
+                        case _:
+                            yield msg
+
+            except trio.BrokenResourceError:
+
+                # if not self._autorecon:
+                raise
+
+            await self.aclose()
+
+            # if self._autorecon:  # attempt reconnect
+            #     await self._reconnect()
+            #     continue
+
+    def connected(self) -> bool:
+        return self._transport.connected() if self._transport else False
+
+    async def _do_handshake(
+        self,
+        aid: Aid,
+
+    ) -> Aid:
+        '''
+        Exchange `(name, UUIDs)` identifiers as the first
+        communication step with any (peer) remote `Actor`.
+
+        These are essentially the "mailbox addresses" found in
+        "actor model" parlance.
+
+        '''
+        await self.send(aid)
+        peer_aid: Aid = await self.recv()
+        log.runtime(
+            f'Received hanshake with peer actor,\n'
+            f'{peer_aid}\n'
+        )
+        # NOTE, we always are referencing the remote peer!
+        self.aid = peer_aid
+        return peer_aid
+
+
+@acm
+async def _connect_chan(
+    addr: UnwrappedAddress
+) -> typing.AsyncGenerator[Channel, None]:
+    '''
+    Create and connect a channel with disconnect on context manager
+    teardown.
+
+    '''
+    chan = await Channel.from_addr(addr)
+    yield chan
+    with trio.CancelScope(shield=True):
+        await chan.aclose()

tractor/ipc/_fd_share.py

@@ -0,0 +1,163 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+'''
+File-descriptor-sharing on `linux` by "wilhelm_of_bohemia".
+
+'''
+from __future__ import annotations
+import os
+import array
+import socket
+import tempfile
+from pathlib import Path
+from contextlib import ExitStack
+
+import trio
+import tractor
+from tractor.ipc import RBToken
+
+
+actor_name = 'ringd'
+
+
+_rings: dict[str, dict] = {}
+
+
+async def _attach_to_ring(
+    ring_name: str
+) -> tuple[int, int, int]:
+    actor = tractor.current_actor()
+
+    fd_amount = 3
+    sock_path = (
+        Path(tempfile.gettempdir())
+        /
+        f'{os.getpid()}-pass-ring-fds-{ring_name}-to-{actor.name}.sock'
+    )
+    sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    sock.bind(sock_path)
+    sock.listen(1)
+
+    async with (
+        tractor.find_actor(actor_name) as ringd,
+        ringd.open_context(
+            _pass_fds,
+            name=ring_name,
+            sock_path=sock_path
+        ) as (ctx, _sent)
+    ):
+        # prepare array to receive FD
+        fds = array.array("i", [0] * fd_amount)
+
+        conn, _ = sock.accept()
+
+        # receive FD
+        msg, ancdata, flags, addr = conn.recvmsg(
+            1024,
+            socket.CMSG_LEN(fds.itemsize * fd_amount)
+        )
+
+        for (
+            cmsg_level,
+            cmsg_type,
+            cmsg_data,
+        ) in ancdata:
+            if (
+                cmsg_level == socket.SOL_SOCKET
+                and
+                cmsg_type == socket.SCM_RIGHTS
+            ):
+                fds.frombytes(cmsg_data[:fds.itemsize * fd_amount])
+                break
+            else:
+                raise RuntimeError("Receiver: No FDs received")
+
+        conn.close()
+        sock.close()
+        sock_path.unlink()
+
+        return RBToken.from_msg(
+            await ctx.wait_for_result()
+        )
+
+
+@tractor.context
+async def _pass_fds(
+    ctx: tractor.Context,
+    name: str,
+    sock_path: str
+) -> RBToken:
+    global _rings
+    token = _rings[name]
+    client = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    client.connect(sock_path)
+    await ctx.started()
+    fds = array.array('i', token.fds)
+    client.sendmsg([b'FDs'], [(socket.SOL_SOCKET, socket.SCM_RIGHTS, fds)])
+    client.close()
+    return token
+
+
+@tractor.context
+async def _open_ringbuf(
+    ctx: tractor.Context,
+    name: str,
+    buf_size: int
+) -> RBToken:
+    global _rings
+    is_owner = False
+    if name not in _rings:
+        stack = ExitStack()
+        token = stack.enter_context(
+            tractor.open_ringbuf(
+                name,
+                buf_size=buf_size
+            )
+        )
+        _rings[name] = {
+            'token': token,
+            'stack': stack,
+        }
+        is_owner = True
+
+    ring = _rings[name]
+    await ctx.started()
+
+    try:
+        await trio.sleep_forever()
+
+    except tractor.ContextCancelled:
+        ...
+
+    finally:
+        if is_owner:
+            ring['stack'].close()
+
+
+async def open_ringbuf(
+    name: str,
+    buf_size: int
+) -> RBToken:
+    async with (
+        tractor.find_actor(actor_name) as ringd,
+        ringd.open_context(
+            _open_ringbuf,
+            name=name,
+            buf_size=buf_size
+        ) as (rd_ctx, _)
+    ):
+        yield await _attach_to_ring(name)
+        await rd_ctx.cancel()

tractor/ipc/_linux.py

@@ -0,0 +1,153 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+'''
+Linux specifics, for now we are only exposing EventFD
+
+'''
+import os
+import errno
+
+import cffi
+import trio
+
+ffi = cffi.FFI()
+
+# Declare the C functions and types we plan to use.
+#    - eventfd: for creating the event file descriptor
+#    - write:   for writing to the file descriptor
+#    - read:    for reading from the file descriptor
+#    - close:   for closing the file descriptor
+ffi.cdef(
+    '''
+    int eventfd(unsigned int initval, int flags);
+
+    ssize_t write(int fd, const void *buf, size_t count);
+    ssize_t read(int fd, void *buf, size_t count);
+
+    int close(int fd);
+    '''
+)
+
+
+# Open the default dynamic library (essentially 'libc' in most cases)
+C = ffi.dlopen(None)
+
+
+# Constants from <sys/eventfd.h>, if needed.
+EFD_SEMAPHORE = 1
+EFD_CLOEXEC = 0o2000000
+EFD_NONBLOCK = 0o4000
+
+
+def open_eventfd(initval: int = 0, flags: int = 0) -> int:
+    '''
+    Open an eventfd with the given initial value and flags.
+    Returns the file descriptor on success, otherwise raises OSError.
+
+    '''
+    fd = C.eventfd(initval, flags)
+    if fd < 0:
+        raise OSError(errno.errorcode[ffi.errno], 'eventfd failed')
+    return fd
+
+
+def write_eventfd(fd: int, value: int) -> int:
+    '''
+    Write a 64-bit integer (uint64_t) to the eventfd's counter.
+
+    '''
+    # Create a uint64_t* in C, store `value`
+    data_ptr = ffi.new('uint64_t *', value)
+
+    # Call write(fd, data_ptr, 8)
+    # We expect to write exactly 8 bytes (sizeof(uint64_t))
+    ret = C.write(fd, data_ptr, 8)
+    if ret < 0:
+        raise OSError(errno.errorcode[ffi.errno], 'write to eventfd failed')
+    return ret
+
+
+def read_eventfd(fd: int) -> int:
+    '''
+    Read a 64-bit integer (uint64_t) from the eventfd, returning the value.
+    Reading resets the counter to 0 (unless using EFD_SEMAPHORE).
+
+    '''
+    # Allocate an 8-byte buffer in C for reading
+    buf = ffi.new('char[]', 8)
+
+    ret = C.read(fd, buf, 8)
+    if ret < 0:
+        raise OSError(errno.errorcode[ffi.errno], 'read from eventfd failed')
+    # Convert the 8 bytes we read into a Python integer
+    data_bytes = ffi.unpack(buf, 8)  # returns a Python bytes object of length 8
+    value = int.from_bytes(data_bytes, byteorder='little', signed=False)
+    return value
+
+
+def close_eventfd(fd: int) -> int:
+    '''
+    Close the eventfd.
+
+    '''
+    ret = C.close(fd)
+    if ret < 0:
+        raise OSError(errno.errorcode[ffi.errno], 'close failed')
+
+
+class EventFD:
+    '''
+    Use a previously opened eventfd(2), meant to be used in
+    sub-actors after root actor opens the eventfds then passes
+    them through pass_fds
+
+    '''
+
+    def __init__(
+        self,
+        fd: int,
+        omode: str
+    ):
+        self._fd: int = fd
+        self._omode: str = omode
+        self._fobj = None
+
+    @property
+    def fd(self) -> int | None:
+        return self._fd
+
+    def write(self, value: int) -> int:
+        return write_eventfd(self._fd, value)
+
+    async def read(self) -> int:
+        return await trio.to_thread.run_sync(
+            read_eventfd, self._fd,
+            abandon_on_cancel=True
+        )
+
+    def open(self):
+        self._fobj = os.fdopen(self._fd, self._omode)
+
+    def close(self):
+        if self._fobj:
+            self._fobj.close()
+
+    def __enter__(self):
+        self.open()
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.close()

tractor/ipc/_mp_bs.py

@@ -0,0 +1,45 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+'''
+Utils to tame mp non-SC madeness
+
+'''
+def disable_mantracker():
+    '''
+    Disable all ``multiprocessing``` "resource tracking" machinery since
+    it's an absolute multi-threaded mess of non-SC madness.
+
+    '''
+    from multiprocessing import resource_tracker as mantracker
+
+    # Tell the "resource tracker" thing to fuck off.
+    class ManTracker(mantracker.ResourceTracker):
+        def register(self, name, rtype):
+            pass
+
+        def unregister(self, name, rtype):
+            pass
+
+        def ensure_running(self):
+            pass
+
+    # "know your land and know your prey"
+    # https://www.dailymotion.com/video/x6ozzco
+    mantracker._resource_tracker = ManTracker()
+    mantracker.register = mantracker._resource_tracker.register
+    mantracker.ensure_running = mantracker._resource_tracker.ensure_running
+    mantracker.unregister = mantracker._resource_tracker.unregister
+    mantracker.getfd = mantracker._resource_tracker.getfd

tractor/ipc/_ringbuf.py

@@ -0,0 +1,253 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+'''
+IPC Reliable RingBuffer implementation
+
+'''
+from __future__ import annotations
+from contextlib import contextmanager as cm
+from multiprocessing.shared_memory import SharedMemory
+
+import trio
+from msgspec import (
+    Struct,
+    to_builtins
+)
+
+from ._linux import (
+    EFD_NONBLOCK,
+    open_eventfd,
+    EventFD
+)
+from ._mp_bs import disable_mantracker
+
+
+disable_mantracker()
+
+
+class RBToken(Struct, frozen=True):
+    '''
+    RingBuffer token contains necesary info to open the two
+    eventfds and the shared memory
+
+    '''
+    shm_name: str
+    write_eventfd: int
+    wrap_eventfd: int
+    buf_size: int
+
+    def as_msg(self):
+        return to_builtins(self)
+
+    @classmethod
+    def from_msg(cls, msg: dict) -> RBToken:
+        if isinstance(msg, RBToken):
+            return msg
+
+        return RBToken(**msg)
+
+
+@cm
+def open_ringbuf(
+    shm_name: str,
+    buf_size: int = 10 * 1024,
+    write_efd_flags: int = 0,
+    wrap_efd_flags: int = 0
+) -> RBToken:
+    shm = SharedMemory(
+        name=shm_name,
+        size=buf_size,
+        create=True
+    )
+    try:
+        token = RBToken(
+            shm_name=shm_name,
+            write_eventfd=open_eventfd(flags=write_efd_flags),
+            wrap_eventfd=open_eventfd(flags=wrap_efd_flags),
+            buf_size=buf_size
+        )
+        yield token
+
+    finally:
+        shm.unlink()
+
+
+class RingBuffSender(trio.abc.SendStream):
+    '''
+    IPC Reliable Ring Buffer sender side implementation
+
+    `eventfd(2)` is used for wrap around sync, and also to signal
+    writes to the reader.
+
+    '''
+    def __init__(
+        self,
+        token: RBToken,
+        start_ptr: int = 0,
+    ):
+        token = RBToken.from_msg(token)
+        self._shm = SharedMemory(
+            name=token.shm_name,
+            size=token.buf_size,
+            create=False
+        )
+        self._write_event = EventFD(token.write_eventfd, 'w')
+        self._wrap_event = EventFD(token.wrap_eventfd, 'r')
+        self._ptr = start_ptr
+
+    @property
+    def key(self) -> str:
+        return self._shm.name
+
+    @property
+    def size(self) -> int:
+        return self._shm.size
+
+    @property
+    def ptr(self) -> int:
+        return self._ptr
+
+    @property
+    def write_fd(self) -> int:
+        return self._write_event.fd
+
+    @property
+    def wrap_fd(self) -> int:
+        return self._wrap_event.fd
+
+    async def send_all(self, data: bytes | bytearray | memoryview):
+        # while data is larger than the remaining buf
+        target_ptr = self.ptr + len(data)
+        while target_ptr > self.size:
+            # write all bytes that fit
+            remaining = self.size - self.ptr
+            self._shm.buf[self.ptr:] = data[:remaining]
+            # signal write and wait for reader wrap around
+            self._write_event.write(remaining)
+            await self._wrap_event.read()
+
+            # wrap around and trim already written bytes
+            self._ptr = 0
+            data = data[remaining:]
+            target_ptr = self._ptr + len(data)
+
+        # remaining data fits on buffer
+        self._shm.buf[self.ptr:target_ptr] = data
+        self._write_event.write(len(data))
+        self._ptr = target_ptr
+
+    async def wait_send_all_might_not_block(self):
+        raise NotImplementedError
+
+    async def aclose(self):
+        self._write_event.close()
+        self._wrap_event.close()
+        self._shm.close()
+
+    async def __aenter__(self):
+        self._write_event.open()
+        self._wrap_event.open()
+        return self
+
+
+class RingBuffReceiver(trio.abc.ReceiveStream):
+    '''
+    IPC Reliable Ring Buffer receiver side implementation
+
+    `eventfd(2)` is used for wrap around sync, and also to signal
+    writes to the reader.
+
+    '''
+    def __init__(
+        self,
+        token: RBToken,
+        start_ptr: int = 0,
+        flags: int = 0
+    ):
+        token = RBToken.from_msg(token)
+        self._shm = SharedMemory(
+            name=token.shm_name,
+            size=token.buf_size,
+            create=False
+        )
+        self._write_event = EventFD(token.write_eventfd, 'w')
+        self._wrap_event = EventFD(token.wrap_eventfd, 'r')
+        self._ptr = start_ptr
+        self._flags = flags
+
+    @property
+    def key(self) -> str:
+        return self._shm.name
+
+    @property
+    def size(self) -> int:
+        return self._shm.size
+
+    @property
+    def ptr(self) -> int:
+        return self._ptr
+
+    @property
+    def write_fd(self) -> int:
+        return self._write_event.fd
+
+    @property
+    def wrap_fd(self) -> int:
+        return self._wrap_event.fd
+
+    async def receive_some(
+        self,
+        max_bytes: int | None = None,
+        nb_timeout: float = 0.1
+    ) -> memoryview:
+        # if non blocking eventfd enabled, do polling
+        # until next write, this allows signal handling
+        if self._flags | EFD_NONBLOCK:
+            delta = None
+            while delta is None:
+                try:
+                    delta = await self._write_event.read()
+
+                except OSError as e:
+                    if e.errno == 'EAGAIN':
+                        continue
+
+                    raise e
+
+        else:
+            delta = await self._write_event.read()
+
+        # fetch next segment and advance ptr
+        next_ptr = self._ptr + delta
+        segment = self._shm.buf[self._ptr:next_ptr]
+        self._ptr = next_ptr
+
+        if self.ptr == self.size:
+            # reached the end, signal wrap around
+            self._ptr = 0
+            self._wrap_event.write(1)
+
+        return segment
+
+    async def aclose(self):
+        self._write_event.close()
+        self._wrap_event.close()
+        self._shm.close()
+
+    async def __aenter__(self):
+        self._write_event.open()
+        self._wrap_event.open()
+        return self

tractor/ipc/_shm.py

@@ -32,10 +32,14 @@ from multiprocessing.shared_memory import (
     ShareableList,
 )
 
-from msgspec import Struct
+from msgspec import (
+    Struct,
+    to_builtins
+)
 import tractor
 
-from .log import get_logger
+from tractor.ipc._mp_bs import disable_mantracker
+from tractor.log import get_logger
 
 
 _USE_POSIX = getattr(shm, '_USE_POSIX', False)
@@ -46,7 +50,10 @@ if _USE_POSIX:
 try:
     import numpy as np
     from numpy.lib import recfunctions as rfn
-    import nptyping
+    # TODO ruff complains with,
+    # warning| F401: `nptyping` imported but unused; consider using
+    # `importlib.util.find_spec` to test for availability
+    import nptyping  # noqa
 except ImportError:
     pass
 
@@ -54,34 +61,6 @@ except ImportError:
 log = get_logger(__name__)
 
 
-def disable_mantracker():
-    '''
-    Disable all ``multiprocessing``` "resource tracking" machinery since
-    it's an absolute multi-threaded mess of non-SC madness.
-
-    '''
-    from multiprocessing import resource_tracker as mantracker
-
-    # Tell the "resource tracker" thing to fuck off.
-    class ManTracker(mantracker.ResourceTracker):
-        def register(self, name, rtype):
-            pass
-
-        def unregister(self, name, rtype):
-            pass
-
-        def ensure_running(self):
-            pass
-
-    # "know your land and know your prey"
-    # https://www.dailymotion.com/video/x6ozzco
-    mantracker._resource_tracker = ManTracker()
-    mantracker.register = mantracker._resource_tracker.register
-    mantracker.ensure_running = mantracker._resource_tracker.ensure_running
-    mantracker.unregister = mantracker._resource_tracker.unregister
-    mantracker.getfd = mantracker._resource_tracker.getfd
-
-
 disable_mantracker()
 
 
@@ -142,7 +121,7 @@ class NDToken(Struct, frozen=True):
         ).descr
 
     def as_msg(self):
-        return self.to_dict()
+        return to_builtins(self)
 
     @classmethod
     def from_msg(cls, msg: dict) -> NDToken:

tractor/ipc/_tcp.py

@@ -0,0 +1,256 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+'''
+TCP implementation of tractor.ipc._transport.MsgTransport protocol 
+
+'''
+from __future__ import annotations
+import ipaddress
+from typing import (
+    ClassVar,
+)
+# from contextlib import (
+#     asynccontextmanager as acm,
+# )
+
+import msgspec
+import trio
+from trio import (
+    SocketListener,
+    open_tcp_listeners,
+)
+
+from tractor.msg import MsgCodec
+from tractor.log import get_logger
+from tractor.ipc._transport import (
+    MsgTransport,
+    MsgpackTransport,
+)
+
+
+log = get_logger(__name__)
+
+
+class TCPAddress(
+    msgspec.Struct,
+    frozen=True,
+):
+    _host: str
+    _port: int
+
+    def __post_init__(self):
+        try:
+            ipaddress.ip_address(self._host)
+        except ValueError as valerr:
+            raise ValueError(
+                'Invalid {type(self).__name__}._host = {self._host!r}\n'
+            ) from valerr
+
+    proto_key: ClassVar[str] = 'tcp'
+    unwrapped_type: ClassVar[type] = tuple[str, int]
+    def_bindspace: ClassVar[str] = '127.0.0.1'
+
+    # ?TODO, actually validate ipv4/6 with stdlib's `ipaddress`
+    @property
+    def is_valid(self) -> bool:
+        '''
+        Predicate to ensure a valid socket-address pair.
+
+        '''
+        return (
+            self._port != 0
+            and
+            (ipaddr := ipaddress.ip_address(self._host))
+            and not (
+                ipaddr.is_reserved
+                or
+                ipaddr.is_unspecified
+                or
+                ipaddr.is_link_local
+                or
+                ipaddr.is_link_local
+                or
+                ipaddr.is_multicast
+                or
+                ipaddr.is_global
+            )
+        )
+        # ^XXX^ see various properties of invalid addrs here,
+        # https://docs.python.org/3/library/ipaddress.html#ipaddress.IPv4Address
+
+    @property
+    def bindspace(self) -> str:
+        return self._host
+
+    @property
+    def domain(self) -> str:
+        return self._host
+
+    @classmethod
+    def from_addr(
+        cls,
+        addr: tuple[str, int]
+    ) -> TCPAddress:
+        match addr:
+            case (str(), int()):
+                return TCPAddress(addr[0], addr[1])
+            case _:
+                raise ValueError(
+                    f'Invalid unwrapped address for {cls}\n'
+                    f'{addr}\n'
+                )
+
+    def unwrap(self) -> tuple[str, int]:
+        return (
+            self._host,
+            self._port,
+        )
+
+    @classmethod
+    def get_random(
+        cls,
+        bindspace: str = def_bindspace,
+    ) -> TCPAddress:
+        return TCPAddress(bindspace, 0)
+
+    @classmethod
+    def get_root(cls) -> TCPAddress:
+        return TCPAddress(
+            '127.0.0.1',
+            1616,
+        )
+
+    def __repr__(self) -> str:
+        return (
+            f'{type(self).__name__}[{self.unwrap()}]'
+        )
+
+    @classmethod
+    def get_transport(
+        cls,
+        codec: str = 'msgpack',
+    ) -> MsgTransport:
+        match codec:
+            case 'msgspack':
+                return MsgpackTCPStream
+            case _:
+                raise ValueError(
+                    f'No IPC transport with {codec!r} supported !'
+                )
+
+
+async def start_listener(
+    addr: TCPAddress,
+    **kwargs,
+) -> SocketListener:
+    '''
+    Start a TCP socket listener on the given `TCPAddress`.
+
+    '''
+    log.info(
+        f'Attempting to bind TCP socket\n'
+        f'>[\n'
+        f'|_{addr}\n'
+    )
+    # ?TODO, maybe we should just change the lower-level call this is
+    # using internall per-listener?
+    listeners: list[SocketListener] = await open_tcp_listeners(
+        host=addr._host,
+        port=addr._port,
+        **kwargs
+    )
+    # NOTE, for now we don't expect non-singleton-resolving
+    # domain-addresses/multi-homed-hosts.
+    # (though it is supported by `open_tcp_listeners()`)
+    assert len(listeners) == 1
+    listener = listeners[0]
+    host, port = listener.socket.getsockname()[:2]
+
+    log.info(
+        f'Listening on TCP socket\n'
+        f'[>\n'
+        f' |_{addr}\n'
+    )
+    return listener
+
+
+# TODO: typing oddity.. not sure why we have to inherit here, but it
+# seems to be an issue with `get_msg_transport()` returning
+# a `Type[Protocol]`; probably should make a `mypy` issue?
+class MsgpackTCPStream(MsgpackTransport):
+    '''
+    A ``trio.SocketStream`` delivering ``msgpack`` formatted data
+    using the ``msgspec`` codec lib.
+
+    '''
+    address_type = TCPAddress
+    layer_key: int = 4
+
+    @property
+    def maddr(self) -> str:
+        host, port = self.raddr.unwrap()
+        return (
+            # TODO, use `ipaddress` from stdlib to handle
+            # first detecting which of `ipv4/6` before
+            # choosing the routing prefix part.
+            f'/ipv4/{host}'
+
+            f'/{self.address_type.proto_key}/{port}'
+            # f'/{self.chan.uid[0]}'
+            # f'/{self.cid}'
+
+            # f'/cid={cid_head}..{cid_tail}'
+            # TODO: ? not use this ^ right ?
+        )
+
+    def connected(self) -> bool:
+        return self.stream.socket.fileno() != -1
+
+    @classmethod
+    async def connect_to(
+        cls,
+        destaddr: TCPAddress,
+        prefix_size: int = 4,
+        codec: MsgCodec|None = None,
+        **kwargs
+    ) -> MsgpackTCPStream:
+        stream = await trio.open_tcp_stream(
+            *destaddr.unwrap(),
+            **kwargs
+        )
+        return MsgpackTCPStream(
+            stream,
+            prefix_size=prefix_size,
+            codec=codec
+        )
+
+    @classmethod
+    def get_stream_addrs(
+        cls,
+        stream: trio.SocketStream
+    ) -> tuple[
+        TCPAddress,
+        TCPAddress,
+    ]:
+        # TODO, what types are these?
+        lsockname = stream.socket.getsockname()
+        l_sockaddr: tuple[str, int] = tuple(lsockname[:2])
+        rsockname = stream.socket.getpeername()
+        r_sockaddr: tuple[str, int] = tuple(rsockname[:2])
+        return (
+            TCPAddress.from_addr(l_sockaddr),
+            TCPAddress.from_addr(r_sockaddr),
+        )

tractor/ipc/_transport.py

@@ -0,0 +1,514 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+'''
+typing.Protocol based generic msg API, implement this class to add
+backends for tractor.ipc.Channel
+
+'''
+from __future__ import annotations
+from typing import (
+    runtime_checkable,
+    Type,
+    Protocol,
+    # TypeVar,
+    ClassVar,
+    TYPE_CHECKING,
+)
+from collections.abc import (
+    AsyncGenerator,
+    AsyncIterator,
+)
+import struct
+
+import trio
+import msgspec
+from tricycle import BufferedReceiveStream
+
+from tractor.log import get_logger
+from tractor._exceptions import (
+    MsgTypeError,
+    TransportClosed,
+    _mk_send_mte,
+    _mk_recv_mte,
+)
+from tractor.msg import (
+    _ctxvar_MsgCodec,
+    # _codec,  XXX see `self._codec` sanity/debug checks
+    MsgCodec,
+    MsgType,
+    types as msgtypes,
+    pretty_struct,
+)
+
+if TYPE_CHECKING:
+    from tractor._addr import Address
+
+log = get_logger(__name__)
+
+
+# (codec, transport)
+MsgTransportKey = tuple[str, str]
+
+
+# from tractor.msg.types import MsgType
+# ?TODO? this should be our `Union[*msgtypes.__spec__]` alias now right..?
+# => BLEH, except can't bc prots must inherit typevar or param-spec
+#   vars..
+# MsgType = TypeVar('MsgType')
+
+
+@runtime_checkable
+class MsgTransport(Protocol):
+#
+# class MsgTransport(Protocol[MsgType]):
+# ^-TODO-^ consider using a generic def and indexing with our
+# eventual msg definition/types?
+# - https://docs.python.org/3/library/typing.html#typing.Protocol
+
+    stream: trio.SocketStream
+    drained: list[MsgType]
+
+    address_type: ClassVar[Type[Address]]
+    codec_key: ClassVar[str]
+
+    # XXX: should this instead be called `.sendall()`?
+    async def send(self, msg: MsgType) -> None:
+        ...
+
+    async def recv(self) -> MsgType:
+        ...
+
+    def __aiter__(self) -> MsgType:
+        ...
+
+    def connected(self) -> bool:
+        ...
+
+    # defining this sync otherwise it causes a mypy error because it
+    # can't figure out it's a generator i guess?..?
+    def drain(self) -> AsyncIterator[dict]:
+        ...
+
+    @classmethod
+    def key(cls) -> MsgTransportKey:
+        return (
+            cls.codec_key,
+            cls.address_type.proto_key,
+        )
+
+    @property
+    def laddr(self) -> Address:
+        ...
+
+    @property
+    def raddr(self) -> Address:
+        ...
+
+    @property
+    def maddr(self) -> str:
+        ...
+
+    @classmethod
+    async def connect_to(
+        cls,
+        addr: Address,
+        **kwargs
+    ) -> MsgTransport:
+        ...
+
+    @classmethod
+    def get_stream_addrs(
+        cls,
+        stream: trio.abc.Stream
+    ) -> tuple[
+        Address,  # local
+        Address   # remote
+    ]:
+        '''
+        Return the transport protocol's address pair for the local
+        and remote-peer side.
+
+        '''
+        ...
+
+    # TODO, such that all `.raddr`s for each `SocketStream` are
+    # delivered?
+    # -[ ] move `.open_listener()` here and internally track the
+    #     listener set, per address?
+    # def get_peers(
+    #     self,
+    # ) -> list[Address]:
+    #     ...
+
+
+
+class MsgpackTransport(MsgTransport):
+
+    # TODO: better naming for this?
+    # -[ ] check how libp2p does naming for such things?
+    codec_key: str = 'msgpack'
+
+    def __init__(
+        self,
+        stream: trio.abc.Stream,
+        prefix_size: int = 4,
+
+        # XXX optionally provided codec pair for `msgspec`:
+        # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
+        #
+        # TODO: define this as a `Codec` struct which can be
+        # overriden dynamically by the application/runtime?
+        codec: MsgCodec = None,
+
+    ) -> None:
+        self.stream = stream
+        (
+            self._laddr,
+            self._raddr,
+        ) = self.get_stream_addrs(stream)
+
+        # create read loop instance
+        self._aiter_pkts = self._iter_packets()
+        self._send_lock = trio.StrictFIFOLock()
+
+        # public i guess?
+        self.drained: list[dict] = []
+
+        self.recv_stream = BufferedReceiveStream(
+            transport_stream=stream
+        )
+        self.prefix_size = prefix_size
+
+        # allow for custom IPC msg interchange format
+        # dynamic override Bo
+        self._task = trio.lowlevel.current_task()
+
+        # XXX for ctxvar debug only!
+        # self._codec: MsgCodec = (
+        #     codec
+        #     or
+        #     _codec._ctxvar_MsgCodec.get()
+        # )
+
+    async def _iter_packets(self) -> AsyncGenerator[dict, None]:
+        '''
+        Yield `bytes`-blob decoded packets from the underlying TCP
+        stream using the current task's `MsgCodec`.
+
+        This is a streaming routine implemented as an async generator
+        func (which was the original design, but could be changed?)
+        and is allocated by a `.__call__()` inside `.__init__()` where
+        it is assigned to the `._aiter_pkts` attr.
+
+        '''
+        decodes_failed: int = 0
+
+        tpt_name: str = f'{type(self).__name__!r}'
+        while True:
+            try:
+                header: bytes = await self.recv_stream.receive_exactly(4)
+            except (
+                ValueError,
+                ConnectionResetError,
+
+                # not sure entirely why we need this but without it we
+                # seem to be getting racy failures here on
+                # arbiter/registry name subs..
+                trio.BrokenResourceError,
+
+            ) as trans_err:
+
+                loglevel = 'transport'
+                match trans_err:
+                    # case (
+                    #     ConnectionResetError()
+                    # ):
+                    #     loglevel = 'transport'
+
+                    # peer actor (graceful??) TCP EOF but `tricycle`
+                    # seems to raise a 0-bytes-read?
+                    case ValueError() if (
+                        'unclean EOF' in trans_err.args[0]
+                    ):
+                        pass
+
+                    # peer actor (task) prolly shutdown quickly due
+                    # to cancellation
+                    case trio.BrokenResourceError() if (
+                        'Connection reset by peer' in trans_err.args[0]
+                    ):
+                        pass
+
+                    # unless the disconnect condition falls under "a
+                    # normal operation breakage" we usualy console warn
+                    # about it.
+                    case _:
+                        loglevel: str = 'warning'
+
+
+                raise TransportClosed(
+                    message=(
+                        f'{tpt_name} already closed by peer\n'
+                    ),
+                    src_exc=trans_err,
+                    loglevel=loglevel,
+                ) from trans_err
+
+            # XXX definitely can happen if transport is closed
+            # manually by another `trio.lowlevel.Task` in the
+            # same actor; we use this in some simulated fault
+            # testing for ex, but generally should never happen
+            # under normal operation!
+            #
+            # NOTE: as such we always re-raise this error from the
+            #       RPC msg loop!
+            except trio.ClosedResourceError as cre:
+                closure_err = cre
+
+                raise TransportClosed(
+                    message=(
+                        f'{tpt_name} was already closed locally ?\n'
+                    ),
+                    src_exc=closure_err,
+                    loglevel='error',
+                    raise_on_report=(
+                        'another task closed this fd' in closure_err.args
+                    ),
+                ) from closure_err
+
+            # graceful TCP EOF disconnect
+            if header == b'':
+                raise TransportClosed(
+                    message=(
+                        f'{tpt_name} already gracefully closed\n'
+                    ),
+                    loglevel='transport',
+                )
+
+            size: int
+            size, = struct.unpack("<I", header)
+
+            log.transport(f'received header {size}')  # type: ignore
+            msg_bytes: bytes = await self.recv_stream.receive_exactly(size)
+
+            log.transport(f"received {msg_bytes}")  # type: ignore
+            try:
+                # NOTE: lookup the `trio.Task.context`'s var for
+                # the current `MsgCodec`.
+                codec: MsgCodec = _ctxvar_MsgCodec.get()
+
+                # XXX for ctxvar debug only!
+                # if self._codec.pld_spec != codec.pld_spec:
+                #     assert (
+                #         task := trio.lowlevel.current_task()
+                #     ) is not self._task
+                #     self._task = task
+                #     self._codec = codec
+                #     log.runtime(
+                #         f'Using new codec in {self}.recv()\n'
+                #         f'codec: {self._codec}\n\n'
+                #         f'msg_bytes: {msg_bytes}\n'
+                #     )
+                yield codec.decode(msg_bytes)
+
+            # XXX NOTE: since the below error derives from
+            # `DecodeError` we need to catch is specially
+            # and always raise such that spec violations
+            # are never allowed to be caught silently!
+            except msgspec.ValidationError as verr:
+                msgtyperr: MsgTypeError = _mk_recv_mte(
+                    msg=msg_bytes,
+                    codec=codec,
+                    src_validation_error=verr,
+                )
+                # XXX deliver up to `Channel.recv()` where
+                # a re-raise and `Error`-pack can inject the far
+                # end actor `.uid`.
+                yield msgtyperr
+
+            except (
+                msgspec.DecodeError,
+                UnicodeDecodeError,
+            ):
+                if decodes_failed < 4:
+                    # ignore decoding errors for now and assume they have to
+                    # do with a channel drop - hope that receiving from the
+                    # channel will raise an expected error and bubble up.
+                    try:
+                        msg_str: str|bytes = msg_bytes.decode()
+                    except UnicodeDecodeError:
+                        msg_str = msg_bytes
+
+                    log.exception(
+                        'Failed to decode msg?\n'
+                        f'{codec}\n\n'
+                        'Rxed bytes from wire:\n\n'
+                        f'{msg_str!r}\n'
+                    )
+                    decodes_failed += 1
+                else:
+                    raise
+
+    async def send(
+        self,
+        msg: msgtypes.MsgType,
+
+        strict_types: bool = True,
+        hide_tb: bool = True,
+
+    ) -> None:
+        '''
+        Send a msgpack encoded py-object-blob-as-msg over TCP.
+
+        If `strict_types == True` then a `MsgTypeError` will be raised on any
+        invalid msg type
+
+        '''
+        __tracebackhide__: bool = hide_tb
+
+        # XXX see `trio._sync.AsyncContextManagerMixin` for details
+        # on the `.acquire()`/`.release()` sequencing..
+        async with self._send_lock:
+
+            # NOTE: lookup the `trio.Task.context`'s var for
+            # the current `MsgCodec`.
+            codec: MsgCodec = _ctxvar_MsgCodec.get()
+
+            # XXX for ctxvar debug only!
+            # if self._codec.pld_spec != codec.pld_spec:
+            #     self._codec = codec
+            #     log.runtime(
+            #         f'Using new codec in {self}.send()\n'
+            #         f'codec: {self._codec}\n\n'
+            #         f'msg: {msg}\n'
+            #     )
+
+            if type(msg) not in msgtypes.__msg_types__:
+                if strict_types:
+                    raise _mk_send_mte(
+                        msg,
+                        codec=codec,
+                    )
+                else:
+                    log.warning(
+                        'Sending non-`Msg`-spec msg?\n\n'
+                        f'{msg}\n'
+                    )
+
+            try:
+                bytes_data: bytes = codec.encode(msg)
+            except TypeError as _err:
+                typerr = _err
+                msgtyperr: MsgTypeError = _mk_send_mte(
+                    msg,
+                    codec=codec,
+                    message=(
+                        f'IPC-msg-spec violation in\n\n'
+                        f'{pretty_struct.Struct.pformat(msg)}'
+                    ),
+                    src_type_error=typerr,
+                )
+                raise msgtyperr from typerr
+
+            # supposedly the fastest says,
+            # https://stackoverflow.com/a/54027962
+            size: bytes = struct.pack("<I", len(bytes_data))
+            try:
+                return await self.stream.send_all(size + bytes_data)
+            except (
+                trio.BrokenResourceError,
+            ) as bre:
+                trans_err = bre
+                tpt_name: str = f'{type(self).__name__!r}'
+                match trans_err:
+                    case trio.BrokenResourceError() if (
+                        '[Errno 32] Broken pipe' in trans_err.args[0]
+                        # ^XXX, specifc to UDS transport and its,
+                        # well, "speediness".. XD
+                        # |_ likely todo with races related to how fast
+                        #    the socket is setup/torn-down on linux
+                        #    as it pertains to rando pings from the
+                        #    `.discovery` subsys and protos.
+                    ):
+                        raise TransportClosed.from_src_exc(
+                            message=(
+                                f'{tpt_name} already closed by peer\n'
+                            ),
+                            body=f'{self}\n',
+                            src_exc=trans_err,
+                            raise_on_report=True,
+                            loglevel='transport',
+                        ) from bre
+
+                    # unless the disconnect condition falls under "a
+                    # normal operation breakage" we usualy console warn
+                    # about it.
+                    case _:
+                        log.exception(
+                            '{tpt_name} layer failed pre-send ??\n'
+                        )
+                        raise trans_err
+
+        # ?TODO? does it help ever to dynamically show this
+        # frame?
+        # try:
+        #     <the-above_code>
+        # except BaseException as _err:
+        #     err = _err
+        #     if not isinstance(err, MsgTypeError):
+        #         __tracebackhide__: bool = False
+        #     raise
+
+    async def recv(self) -> msgtypes.MsgType:
+        return await self._aiter_pkts.asend(None)
+
+    async def drain(self) -> AsyncIterator[dict]:
+        '''
+        Drain the stream's remaining messages sent from
+        the far end until the connection is closed by
+        the peer.
+
+        '''
+        try:
+            async for msg in self._iter_packets():
+                self.drained.append(msg)
+        except TransportClosed:
+            for msg in self.drained:
+                yield msg
+
+    def __aiter__(self):
+        return self._aiter_pkts
+
+    @property
+    def laddr(self) -> Address:
+        return self._laddr
+
+    @property
+    def raddr(self) -> Address:
+        return self._raddr
+
+    def pformat(self) -> str:
+        return (
+            f'<{type(self).__name__}(\n'
+            f' |_peers: 2\n'
+            f'   laddr: {self._laddr}\n'
+            f'   raddr: {self._raddr}\n'
+            # f'\n'
+            f' |_task: {self._task}\n'
+            f')>\n'
+        )
+
+    __repr__ = __str__ = pformat

tractor/ipc/_types.py

@@ -0,0 +1,123 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+'''
+IPC subsys type-lookup helpers?
+
+'''
+from typing import (
+    Type,
+    # TYPE_CHECKING,
+)
+
+import trio
+import socket
+
+from tractor.ipc._transport import (
+    MsgTransportKey,
+    MsgTransport
+)
+from tractor.ipc._tcp import (
+    TCPAddress,
+    MsgpackTCPStream,
+)
+from tractor.ipc._uds import (
+    UDSAddress,
+    MsgpackUDSStream,
+)
+
+# if TYPE_CHECKING:
+#     from tractor._addr import Address
+
+
+Address = TCPAddress|UDSAddress
+
+# manually updated list of all supported msg transport types
+_msg_transports = [
+    MsgpackTCPStream,
+    MsgpackUDSStream
+]
+
+
+# convert a MsgTransportKey to the corresponding transport type
+_key_to_transport: dict[
+    MsgTransportKey,
+    Type[MsgTransport],
+] = {
+    ('msgpack', 'tcp'): MsgpackTCPStream,
+    ('msgpack', 'uds'): MsgpackUDSStream,
+}
+
+# convert an Address wrapper to its corresponding transport type
+_addr_to_transport: dict[
+    Type[TCPAddress|UDSAddress],
+    Type[MsgTransport]
+] = {
+    TCPAddress: MsgpackTCPStream,
+    UDSAddress: MsgpackUDSStream,
+}
+
+
+def transport_from_addr(
+    addr: Address,
+    codec_key: str = 'msgpack',
+) -> Type[MsgTransport]:
+    '''
+    Given a destination address and a desired codec, find the
+    corresponding `MsgTransport` type.
+
+    '''
+    try:
+        return _addr_to_transport[type(addr)]
+
+    except KeyError:
+        raise NotImplementedError(
+            f'No known transport for address {repr(addr)}'
+        )
+
+
+def transport_from_stream(
+    stream: trio.abc.Stream,
+    codec_key: str = 'msgpack'
+) -> Type[MsgTransport]:
+    '''
+    Given an arbitrary `trio.abc.Stream` and a desired codec,
+    find the corresponding `MsgTransport` type.
+
+    '''
+    transport = None
+    if isinstance(stream, trio.SocketStream):
+        sock: socket.socket = stream.socket
+        match sock.family:
+            case socket.AF_INET | socket.AF_INET6:
+                transport = 'tcp'
+
+            case socket.AF_UNIX:
+                transport = 'uds'
+
+            case _:
+                raise NotImplementedError(
+                    f'Unsupported socket family: {sock.family}'
+                )
+
+    if not transport:
+        raise NotImplementedError(
+            f'Could not figure out transport type for stream type {type(stream)}'
+        )
+
+    key = (codec_key, transport)
+
+    return _key_to_transport[key]

tractor/ipc/_uds.py

@@ -0,0 +1,422 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+'''
+Unix Domain Socket implementation of tractor.ipc._transport.MsgTransport protocol 
+
+'''
+from __future__ import annotations
+from pathlib import Path
+import os
+from socket import (
+    AF_UNIX,
+    SOCK_STREAM,
+    SO_PASSCRED,
+    SO_PEERCRED,
+    SOL_SOCKET,
+)
+import struct
+from typing import (
+    TYPE_CHECKING,
+    ClassVar,
+)
+
+import msgspec
+import trio
+from trio import (
+    socket,
+    SocketListener,
+)
+from trio._highlevel_open_unix_stream import (
+    close_on_error,
+    has_unix,
+)
+
+from tractor.msg import MsgCodec
+from tractor.log import get_logger
+from tractor.ipc._transport import (
+    MsgpackTransport,
+)
+from .._state import (
+    get_rt_dir,
+    current_actor,
+    is_root_process,
+)
+
+if TYPE_CHECKING:
+    from ._runtime import Actor
+
+
+log = get_logger(__name__)
+
+
+def unwrap_sockpath(
+    sockpath: Path,
+) -> tuple[Path, Path]:
+    return (
+        sockpath.parent,
+        sockpath.name,
+    )
+
+
+class UDSAddress(
+    msgspec.Struct,
+    frozen=True,
+):
+    filedir: str|Path|None
+    filename: str|Path
+    maybe_pid: int|None = None
+
+    # TODO, maybe we should use better field and value
+    # -[x] really this is a `.protocol_key` not a "name" of anything.
+    # -[ ] consider a 'unix' proto-key instead?
+    # -[ ] need to check what other mult-transport frameworks do
+    #     like zmq, nng, uri-spec et al!
+    proto_key: ClassVar[str] = 'uds'
+    unwrapped_type: ClassVar[type] = tuple[str, int]
+    def_bindspace: ClassVar[Path] = get_rt_dir()
+
+    @property
+    def bindspace(self) -> Path:
+        '''
+        We replicate the "ip-set-of-hosts" part of a UDS socket as
+        just the sub-directory in which we allocate socket files.
+
+        '''
+        return (
+            self.filedir
+            or
+            self.def_bindspace
+            # or
+            # get_rt_dir()
+        )
+
+    @property
+    def sockpath(self) -> Path:
+        return self.bindspace / self.filename
+
+    @property
+    def is_valid(self) -> bool:
+        '''
+        We block socket files not allocated under the runtime subdir.
+
+        '''
+        return self.bindspace in self.sockpath.parents
+
+    @classmethod
+    def from_addr(
+        cls,
+        addr: (
+            tuple[Path|str, Path|str]|Path|str
+        ),
+    ) -> UDSAddress:
+        match addr:
+            case tuple()|list():
+                filedir = Path(addr[0])
+                filename = Path(addr[1])
+                return UDSAddress(
+                    filedir=filedir,
+                    filename=filename,
+                    # maybe_pid=pid,
+                )
+            # NOTE, in case we ever decide to just `.unwrap()`
+            # to a `Path|str`?
+            case str()|Path():
+                sockpath: Path = Path(addr)
+                return UDSAddress(*unwrap_sockpath(sockpath))
+            case _:
+                # import pdbp; pdbp.set_trace()
+                raise TypeError(
+                    f'Bad unwrapped-address for {cls} !\n'
+                    f'{addr!r}\n'
+                )
+
+    def unwrap(self) -> tuple[str, int]:
+        # XXX NOTE, since this gets passed DIRECTLY to
+        # `.ipc._uds.open_unix_socket_w_passcred()`
+        return (
+            str(self.filedir),
+            str(self.filename),
+        )
+
+    @classmethod
+    def get_random(
+        cls,
+        bindspace: Path|None = None,  # default netns
+    ) -> UDSAddress:
+
+        filedir: Path = bindspace or cls.def_bindspace
+        pid: int = os.getpid()
+        actor: Actor|None = current_actor(
+            err_on_no_runtime=False,
+        )
+        if actor:
+            sockname: str = '::'.join(actor.uid) + f'@{pid}'
+        else:
+            prefix: str = '<unknown-actor>'
+            if is_root_process():
+                prefix: str = 'root'
+            sockname: str = f'{prefix}@{pid}'
+
+        sockpath: Path = Path(f'{sockname}.sock')
+        return UDSAddress(
+            filedir=filedir,
+            filename=sockpath,
+            maybe_pid=pid,
+        )
+
+    @classmethod
+    def get_root(cls) -> UDSAddress:
+        def_uds_filename: Path = 'registry@1616.sock'
+        return UDSAddress(
+            filedir=cls.def_bindspace,
+            filename=def_uds_filename,
+            # maybe_pid=1616,
+        )
+
+    # ?TODO, maybe we should just our .msg.pretty_struct.Struct` for
+    # this instead?
+    # -[ ] is it too "multi-line"y tho?
+    #      the compact tuple/.unwrapped() form is simple enough?
+    #
+    def __repr__(self) -> str:
+        if not (pid := self.maybe_pid):
+            pid: str = '<unknown-peer-pid>'
+
+        body: str = (
+            f'({self.filedir}, {self.filename}, {pid})'
+        )
+        return (
+            f'{type(self).__name__}'
+            f'['
+            f'{body}'
+            f']'
+        )
+
+
+async def start_listener(
+    addr: UDSAddress,
+    **kwargs,
+) -> SocketListener:
+    # sock = addr._sock = socket.socket(
+    sock = socket.socket(
+        socket.AF_UNIX,
+        socket.SOCK_STREAM
+    )
+    log.info(
+        f'Attempting to bind UDS socket\n'
+        f'>[\n'
+        f'|_{addr}\n'
+    )
+
+    bindpath: Path = addr.sockpath
+    try:
+        await sock.bind(str(bindpath))
+    except (
+        FileNotFoundError,
+    ) as fdne:
+        raise ConnectionError(
+            f'Bad UDS socket-filepath-as-address ??\n'
+            f'{addr}\n'
+            f' |_sockpath: {addr.sockpath}\n'
+        ) from fdne
+
+    sock.listen(1)
+    log.info(
+        f'Listening on UDS socket\n'
+        f'[>\n'
+        f' |_{addr}\n'
+    )
+    return SocketListener(sock)
+
+
+def close_listener(
+    addr: UDSAddress,
+    lstnr: SocketListener,
+) -> None:
+    '''
+    Close and remove the listening unix socket's path.
+
+    '''
+    lstnr.socket.close()
+    os.unlink(addr.sockpath)
+
+
+async def open_unix_socket_w_passcred(
+    filename: str|bytes|os.PathLike[str]|os.PathLike[bytes],
+) -> trio.SocketStream:
+    '''
+    Literally the exact same as `trio.open_unix_socket()` except we set the additiona
+    `socket.SO_PASSCRED` option to ensure the server side (the process calling `accept()`)
+    can extract the connecting peer's credentials, namely OS specific process
+    related IDs.
+
+    See this SO for "why" the extra opts,
+    - https://stackoverflow.com/a/7982749
+
+    '''
+    if not has_unix:
+        raise RuntimeError("Unix sockets are not supported on this platform")
+
+    # much more simplified logic vs tcp sockets - one socket type and only one
+    # possible location to connect to
+    sock = trio.socket.socket(AF_UNIX, SOCK_STREAM)
+    sock.setsockopt(SOL_SOCKET, SO_PASSCRED, 1)
+    with close_on_error(sock):
+        await sock.connect(os.fspath(filename))
+
+    return trio.SocketStream(sock)
+
+
+def get_peer_info(sock: trio.socket.socket) -> tuple[
+    int,  # pid
+    int,  # uid
+    int,  # guid
+]:
+    '''
+    Deliver the connecting peer's "credentials"-info as defined in
+    a very Linux specific way..
+
+    For more deats see,
+    - `man accept`,
+    - `man unix`,
+
+    this great online guide to all things sockets,
+    - https://beej.us/guide/bgnet/html/split-wide/man-pages.html#setsockoptman
+
+    AND this **wonderful SO answer**
+    - https://stackoverflow.com/a/7982749
+
+    '''
+    creds: bytes = sock.getsockopt(
+        SOL_SOCKET,
+        SO_PEERCRED,
+        struct.calcsize('3i')
+    )
+    # i.e a tuple of the fields,
+    # pid: int, "process"
+    # uid: int, "user"
+    # gid: int, "group"
+    return struct.unpack('3i', creds)
+
+
+class MsgpackUDSStream(MsgpackTransport):
+    '''
+    A `trio.SocketStream` around a Unix-Domain-Socket transport
+    delivering `msgpack` encoded msgs using the `msgspec` codec lib.
+
+    '''
+    address_type = UDSAddress
+    layer_key: int = 4
+
+    @property
+    def maddr(self) -> str:
+        if not self.raddr:
+            return '<unknown-peer>'
+
+        filepath: Path = Path(self.raddr.unwrap()[0])
+        return (
+            f'/{self.address_type.proto_key}/{filepath}'
+            # f'/{self.chan.uid[0]}'
+            # f'/{self.cid}'
+
+            # f'/cid={cid_head}..{cid_tail}'
+            # TODO: ? not use this ^ right ?
+        )
+
+    def connected(self) -> bool:
+        return self.stream.socket.fileno() != -1
+
+    @classmethod
+    async def connect_to(
+        cls,
+        addr: UDSAddress,
+        prefix_size: int = 4,
+        codec: MsgCodec|None = None,
+        **kwargs
+    ) -> MsgpackUDSStream:
+
+
+        sockpath: Path = addr.sockpath
+        #
+        # ^XXX NOTE, we don't provide any out-of-band `.pid` info
+        # (like, over the socket as extra msgs) since the (augmented)
+        # `.setsockopt()` call tells the OS provide it; the client
+        # pid can then be read on server/listen() side via
+        # `get_peer_info()` above.
+        try:
+            stream = await open_unix_socket_w_passcred(
+                str(sockpath),
+                **kwargs
+            )
+        except (
+            FileNotFoundError,
+        ) as fdne:
+            raise ConnectionError(
+                f'Bad UDS socket-filepath-as-address ??\n'
+                f'{addr}\n'
+                f' |_sockpath: {sockpath}\n'
+            ) from fdne
+
+        stream = MsgpackUDSStream(
+            stream,
+            prefix_size=prefix_size,
+            codec=codec
+        )
+        stream._raddr = addr
+        return stream
+
+    @classmethod
+    def get_stream_addrs(
+        cls,
+        stream: trio.SocketStream
+    ) -> tuple[
+        Path,
+        int,
+    ]:
+        sock: trio.socket.socket = stream.socket
+
+        # NOTE XXX, it's unclear why one or the other ends up being
+        # `bytes` versus the socket-file-path, i presume it's
+        # something to do with who is the server (called `.listen()`)?
+        # maybe could be better implemented using another info-query
+        # on the socket like,
+        # https://beej.us/guide/bgnet/html/split-wide/system-calls-or-bust.html#gethostnamewho-am-i
+        sockname: str|bytes = sock.getsockname()
+        # https://beej.us/guide/bgnet/html/split-wide/system-calls-or-bust.html#getpeernamewho-are-you
+        peername: str|bytes = sock.getpeername()
+        match (peername, sockname):
+            case (str(), bytes()):
+                sock_path: Path = Path(peername)
+            case (bytes(), str()):
+                sock_path: Path = Path(sockname)
+        (
+            peer_pid,
+            _,
+            _,
+        ) = get_peer_info(sock)
+
+        filedir, filename = unwrap_sockpath(sock_path)
+        laddr = UDSAddress(
+            filedir=filedir,
+            filename=filename,
+            maybe_pid=os.getpid(),
+        )
+        raddr = UDSAddress(
+            filedir=filedir,
+            filename=filename,
+            maybe_pid=peer_pid
+        )
+        return (laddr, raddr)

tractor/log.py

@@ -92,7 +92,7 @@ class StackLevelAdapter(LoggerAdapter):
     ) -> None:
         '''
         IPC transport level msg IO; generally anything below
-        `._ipc.Channel` and friends.
+        `.ipc.Channel` and friends.
 
         '''
         return self.log(5, msg)
@@ -285,7 +285,7 @@ def get_logger(
         # NOTE: for handling for modules that use ``get_logger(__name__)``
         # we make the following stylistic choice:
         # - always avoid duplicate project-package token
-        #   in msg output: i.e. tractor.tractor _ipc.py in header
+        #   in msg output: i.e. tractor.tractor.ipc._chan.py in header
         #   looks ridiculous XD
         # - never show the leaf module name in the {name} part
         #   since in python the {filename} is always this same

tractor/msg/types.py

@@ -31,6 +31,7 @@ from typing import (
     Type,
     TypeVar,
     TypeAlias,
+    # TYPE_CHECKING,
     Union,
 )
 
@@ -47,6 +48,7 @@ from tractor.msg import (
     pretty_struct,
 )
 from tractor.log import get_logger
+# from tractor._addr import UnwrappedAddress
 
 
 log = get_logger('tractor.msgspec')
@@ -141,9 +143,16 @@ class Aid(
     '''
     name: str
     uuid: str
-    # TODO: use built-in support for UUIDs?
-    # -[ ] `uuid.UUID` which has multi-protocol support
-    #  https://jcristharif.com/msgspec/supported-types.html#uuid
+    pid: int|None = None
+
+    # TODO? can/should we extend this field set?
+    # -[ ] use built-in support for UUIDs? `uuid.UUID` which has
+    #     multi-protocol support
+    #     https://jcristharif.com/msgspec/supported-types.html#uuid
+    #
+    # -[ ] as per the `.ipc._uds` / `._addr` comments, maybe we
+    #     should also include at least `.pid` (equiv to port for tcp)
+    #     and/or host-part always?
 
 
 class SpawnSpec(
@@ -161,14 +170,15 @@ class SpawnSpec(
     # a hard `Struct` def for all of these fields!
     _parent_main_data: dict
     _runtime_vars: dict[str, Any]
+    # ^NOTE see `._state._runtime_vars: dict`
 
     # module import capability
     enable_modules: dict[str, str]
 
     # TODO: not just sockaddr pairs?
     # -[ ] abstract into a `TransportAddr` type?
-    reg_addrs: list[tuple[str, int]]
-    bind_addrs: list[tuple[str, int]]
+    reg_addrs: list[tuple[str, str|int]]
+    bind_addrs: list[tuple[str, str|int]]|None
 
 
 # TODO: caps based RPC support in the payload?

uv.lock

@@ -1,14 +1,23 @@
 version = 1
-revision = 1
+revision = 2
 requires-python = ">=3.11"
 
 [[package]]
 name = "attrs"
 version = "24.3.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/48/c8/6260f8ccc11f0917360fc0da435c5c9c7504e3db174d5a12a1494887b045/attrs-24.3.0.tar.gz", hash = "sha256:8f5c07333d543103541ba7be0e2ce16eeee8130cb0b3f9238ab904ce1e85baff", size = 805984 }
+sdist = { url = "https://files.pythonhosted.org/packages/48/c8/6260f8ccc11f0917360fc0da435c5c9c7504e3db174d5a12a1494887b045/attrs-24.3.0.tar.gz", hash = "sha256:8f5c07333d543103541ba7be0e2ce16eeee8130cb0b3f9238ab904ce1e85baff", size = 805984, upload-time = "2024-12-16T06:59:29.899Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/89/aa/ab0f7891a01eeb2d2e338ae8fecbe57fcebea1a24dbb64d45801bfab481d/attrs-24.3.0-py3-none-any.whl", hash = "sha256:ac96cd038792094f438ad1f6ff80837353805ac950cd2aa0e0625ef19850c308", size = 63397 },
+    { url = "https://files.pythonhosted.org/packages/89/aa/ab0f7891a01eeb2d2e338ae8fecbe57fcebea1a24dbb64d45801bfab481d/attrs-24.3.0-py3-none-any.whl", hash = "sha256:ac96cd038792094f438ad1f6ff80837353805ac950cd2aa0e0625ef19850c308", size = 63397, upload-time = "2024-12-16T06:59:26.977Z" },
+]
+
+[[package]]
+name = "bidict"
+version = "0.23.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/9a/6e/026678aa5a830e07cd9498a05d3e7e650a4f56a42f267a53d22bcda1bdc9/bidict-0.23.1.tar.gz", hash = "sha256:03069d763bc387bbd20e7d49914e75fc4132a41937fa3405417e1a5a2d006d71", size = 29093, upload-time = "2024-02-18T19:09:05.748Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/99/37/e8730c3587a65eb5645d4aba2d27aae48e8003614d6aaf15dda67f702f1f/bidict-0.23.1-py3-none-any.whl", hash = "sha256:5dae8d4d79b552a71cbabc7deb25dfe8ce710b17ff41711e13010ead2abfc3e5", size = 32764, upload-time = "2024-02-18T19:09:04.156Z" },
 ]
 
 [[package]]
@@ -18,23 +27,51 @@ source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "pycparser" },
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@@ -321,6 +373,8 @@ name = "tractor"
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+    { name = "psutil" },
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