Use `platformdirs` for `.config.get_rt_dir()`

Thanks to the `tox`-dev community for such a lovely pkg which seems to
solves all the current cross-platform user-dir problems B)

Also this,
- now passes `platformdirs.user_runtime_dir(appname='tractor')`
  and allows caller to pass an optional `subdir` under `tractor/`
  if desired.
- drops the `.config._rtdir: Path` mod var.
- bumps the lock file with the new dep.

pyproject.toml

@@ -47,6 +47,7 @@ dependencies = [
   "msgspec>=0.19.0",
   "cffi>=1.17.1",
   "bidict>=0.23.1",
+  "platformdirs>=4.4.0",
 ]
 
 # ------ project ------
@@ -63,7 +64,6 @@ dev = [
   "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",

tests/test_infected_asyncio.py

@@ -732,15 +732,21 @@ def test_aio_errors_and_channel_propagates_and_closes(
 
 
 async def aio_echo_server(
-    to_trio: trio.MemorySendChannel,
+    chan: to_asyncio.LinkedTaskChannel,
-    from_trio: asyncio.Queue,
 ) -> None:
+    '''
+    An IPC-msg "echo server" with msgs received and relayed by
+    a parent `trio.Task` into a child `asyncio.Task`
+    and then repeated back to that local parent (`trio.Task`)
+    and sent again back to the original calling remote actor.
 
-    to_trio.send_nowait('start')
+    '''
+    # same semantics as `trio.TaskStatus.started()`
+    chan.started_nowait('start')
 
     while True:
         try:
-            msg = await from_trio.get()
+            msg = await chan.get()
         except to_asyncio.TrioTaskExited:
             print(
                 'breaking aio echo loop due to `trio` exit!'
@@ -748,7 +754,7 @@ async def aio_echo_server(
             break
 
         # echo the msg back
-        to_trio.send_nowait(msg)
+        chan.send_nowait(msg)
 
         # if we get the terminate sentinel
         # break the echo loop
@@ -765,7 +771,10 @@ async def trio_to_aio_echo_server(
 ):
     async with to_asyncio.open_channel_from(
         aio_echo_server,
-    ) as (first, chan):
+    ) as (
+        first,  # value from `chan.started_nowait()` above
+        chan,
+    ):
         assert first == 'start'
 
         await ctx.started(first)
@@ -776,7 +785,8 @@ async def trio_to_aio_echo_server(
                 await chan.send(msg)
 
                 out = await chan.receive()
-                # echo back to parent actor-task
+
+                # echo back to parent-actor's remote parent-ctx-task!
                 await stream.send(out)
 
                 if out is None:
@@ -1090,14 +1100,12 @@ def test_sigint_closes_lifetime_stack(
 
 
 # ?TODO asyncio.Task fn-deco?
-# -[ ] do sig checkingat import time like @context?
-# -[ ] maybe name it @aio_task ??
 # -[ ] chan: to_asyncio.InterloopChannel ??
+# -[ ] do fn-sig checking at import time like @context?
+#  |_[ ] maybe name it @a(sync)io_task ??
+# @asyncio_task  <- not bad ??
 async def raise_before_started(
-    # from_trio: asyncio.Queue,
-    # to_trio: trio.abc.SendChannel,
     chan: to_asyncio.LinkedTaskChannel,
-
 ) -> None:
     '''
     `asyncio.Task` entry point which RTEs before calling

tests/test_log_sys.py

@@ -0,0 +1,150 @@
+'''
+`tractor.log`-wrapping unit tests.
+
+'''
+from pathlib import Path
+import shutil
+
+import pytest
+import tractor
+from tractor import _code_load
+
+
+def test_root_pkg_not_duplicated_in_logger_name():
+    '''
+    When both `pkg_name` and `name` are passed and they have
+    a common `<root_name>.< >` prefix, ensure that it is not
+    duplicated in the child's `StackLevelAdapter.name: str`.
+
+    '''
+    project_name: str = 'pylib'
+    pkg_path: str = 'pylib.subpkg.mod'
+
+    proj_log = tractor.log.get_logger(
+        pkg_name=project_name,
+        mk_sublog=False,
+    )
+
+    sublog = tractor.log.get_logger(
+        pkg_name=project_name,
+        name=pkg_path,
+    )
+
+    assert proj_log is not sublog
+    assert sublog.name.count(proj_log.name) == 1
+    assert 'mod' not in sublog.name
+
+
+def test_implicit_mod_name_applied_for_child(
+    testdir: pytest.Pytester,
+    loglevel: str,
+):
+    '''
+    Verify that when `.log.get_logger(pkg_name='pylib')` is called
+    from a given sub-mod from within the `pylib` pkg-path, we
+    implicitly set the equiv of `name=__name__` from the caller's
+    module.
+
+    '''
+    # tractor.log.get_console_log(level=loglevel)
+    proj_name: str = 'snakelib'
+    mod_code: str = (
+        f'import tractor\n'
+        f'\n'
+        f'log = tractor.log.get_logger(pkg_name="{proj_name}")\n'
+    )
+
+    # create a sub-module for each pkg layer
+    _lib = testdir.mkpydir(proj_name)
+    pkg: Path = Path(_lib)
+    subpkg: Path = pkg / 'subpkg'
+    subpkg.mkdir()
+
+    pkgmod: Path = subpkg / "__init__.py"
+    pkgmod.touch()
+
+    _submod: Path = testdir.makepyfile(
+        _mod=mod_code,
+    )
+
+    pkg_mod = pkg / 'mod.py'
+    pkg_subpkg_submod = subpkg / 'submod.py'
+    shutil.copyfile(
+        _submod,
+        pkg_mod,
+    )
+    shutil.copyfile(
+        _submod,
+        pkg_subpkg_submod,
+    )
+    testdir.chdir()
+
+    # XXX NOTE, once the "top level" pkg mod has been
+    # imported, we can then use `import` syntax to
+    # import it's sub-pkgs and modules.
+    pkgmod = _code_load.load_module_from_path(
+        Path(pkg / '__init__.py'),
+        module_name=proj_name,
+    )
+    pkg_root_log = tractor.log.get_logger(
+        pkg_name=proj_name,
+        mk_sublog=False,
+    )
+    assert pkg_root_log.name == proj_name
+    assert not pkg_root_log.logger.getChildren()
+
+    from snakelib import mod
+    assert mod.log.name == proj_name
+
+    from snakelib.subpkg import submod
+    assert (
+        submod.log.name
+        ==
+        submod.__package__  # ?TODO, use this in `.get_logger()` instead?
+        ==
+        f'{proj_name}.subpkg'
+    )
+
+    sub_logs = pkg_root_log.logger.getChildren()
+    assert len(sub_logs) == 1  # only one nested sub-pkg module
+    assert submod.log.logger in sub_logs
+
+    # breakpoint()
+
+
+# TODO, moar tests against existing feats:
+# ------ - ------
+# - [ ] color settings?
+# - [ ] header contents like,
+#   - actor + thread + task names from various conc-primitives,
+# - [ ] `StackLevelAdapter` extensions,
+#   - our custom levels/methods: `transport|runtime|cance|pdb|devx`
+# - [ ] custom-headers support?
+#
+
+# TODO, test driven dev of new-ideas/long-wanted feats,
+# ------ - ------
+# - [ ] https://github.com/goodboy/tractor/issues/244
+#  - [ ] @catern mentioned using a sync / deterministic sys
+#       and in particular `svlogd`?
+#       |_ https://smarden.org/runit/svlogd.8
+
+# - [ ] using adapter vs. filters?
+#    - https://stackoverflow.com/questions/60691759/add-information-to-every-log-message-in-python-logging/61830838#61830838
+
+# - [ ] `.at_least_level()` optimization which short circuits wtv
+#      `logging` is doing behind the scenes when the level filters
+#      the emission..?
+
+# - [ ] use of `.log.get_console_log()` in subactors and the
+#    subtleties of ensuring it actually emits from a subproc.
+
+# - [ ] this idea of activating per-subsys emissions with some
+#    kind of `.name` filter passed to the runtime or maybe configured
+#    via the root `StackLevelAdapter`?
+
+# - [ ] use of `logging.dict.dictConfig()` to simplify the impl
+#      of any of ^^ ??
+#    - https://stackoverflow.com/questions/7507825/where-is-a-complete-example-of-logging-config-dictconfig
+#    - https://docs.python.org/3/library/logging.config.html#configuration-dictionary-schema
+#    - https://docs.python.org/3/library/logging.config.html#logging.config.dictConfig

tractor/_code_load.py

@@ -0,0 +1,48 @@
+# 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/>.
+
+'''
+(Hot) coad (re-)load utils for python.
+
+'''
+import importlib
+from pathlib import Path
+import sys
+from types import ModuleType
+
+# ?TODO, move this into internal libs?
+# -[ ] we already use it in `modden.config._pymod` as well
+def load_module_from_path(
+    path: Path,
+    module_name: str|None = None,
+) -> ModuleType:
+    '''
+    Taken from SO,
+    https://stackoverflow.com/a/67208147
+
+    which is based on stdlib docs,
+    https://docs.python.org/3/library/importlib.html#importing-a-source-file-directly
+
+    '''
+    module_name = module_name or path.stem
+    spec = importlib.util.spec_from_file_location(
+        module_name,
+        str(path),
+    )
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[module_name] = module
+    spec.loader.exec_module(module)
+    return module

tractor/_rpc.py

@@ -284,6 +284,10 @@ async def _errors_relayed_via_ipc(
     try:
         yield  # run RPC invoke body
 
+    except TransportClosed:
+        log.exception('Tpt disconnect during remote-exc relay?')
+        raise
+
     # box and ship RPC errors for wire-transit via
     # the task's requesting parent IPC-channel.
     except (
@@ -319,6 +323,9 @@ async def _errors_relayed_via_ipc(
                         and debug_kbis
                     )
                 )
+                # TODO? better then `debug_filter` below?
+                and
+                not isinstance(err, TransportClosed)
             ):
                 # XXX QUESTION XXX: is there any case where we'll
                 # want to debug IPC disconnects as a default?
@@ -327,13 +334,25 @@ async def _errors_relayed_via_ipc(
                 # recovery logic - the only case is some kind of
                 # strange bug in our transport layer itself? Going
                 # to keep this open ended for now.
-                log.debug(
+
-                    'RPC task crashed, attempting to enter debugger\n'
+                if _state.debug_mode():
-                    f'|_{ctx}'
+                    log.exception(
-                )
+                        f'RPC task crashed!\n'
+                        f'Attempting to enter debugger\n'
+                        f'\n'
+                        f'{ctx}'
+                    )
+
                 entered_debug = await debug._maybe_enter_pm(
                     err,
                     api_frame=inspect.currentframe(),
+
+                    # don't REPL any psuedo-expected tpt-disconnect
+                    # debug_filter=lambda exc: (
+                    #     type (exc) not in {
+                    #         TransportClosed,
+                    #     }
+                    # ),
                 )
                 if not entered_debug:
                     # if we prolly should have entered the REPL but
@@ -675,6 +694,22 @@ async def _invoke(
                     f'{pretty_struct.pformat(return_msg)}\n'
                 )
                 await chan.send(return_msg)
+                # ?TODO, remove the below since .send() already
+                # doesn't raise on tpt-closed?
+                # try:
+                #     await chan.send(return_msg)
+                # except TransportClosed:
+                #     log.exception(
+                #         f"Failed send final result to 'parent'-side of IPC-ctx!\n"
+                #         f'\n'
+                #         f'{chan}\n'
+                #         f'Channel already disconnected ??\n'
+                #         f'\n'
+                #         f'{pretty_struct.pformat(return_msg)}'
+                #     )
+                #     # ?TODO? will this ever be true though?
+                #     if chan.connected():
+                #         raise
 
             # NOTE: this happens IFF `ctx._scope.cancel()` is
             # called by any of,

tractor/_state.py

@@ -22,7 +22,6 @@ from __future__ import annotations
 from contextvars import (
     ContextVar,
 )
-import os
 from pathlib import Path
 from typing import (
     Any,
@@ -30,6 +29,7 @@ from typing import (
     TYPE_CHECKING,
 )
 
+import platformdirs
 from trio.lowlevel import current_task
 
 if TYPE_CHECKING:
@@ -172,23 +172,32 @@ def current_ipc_ctx(
     return ctx
 
 
-# std ODE (mutable) app state location
-_rtdir: Path = Path(os.environ['XDG_RUNTIME_DIR'])
-
 
 def get_rt_dir(
-    subdir: str = 'tractor'
+    subdir: str|Path|None = None,
 ) -> Path:
     '''
-    Return the user "runtime dir" where most userspace apps stick
+    Return the user "runtime dir", the file-sys location where most
-    their IPC and cache related system util-files; we take hold
+    userspace apps stick their IPC and cache related system
-    of a `'XDG_RUNTIME_DIR'/tractor/` subdir by default.
+    util-files.
+
+    On linux we take use a `'${XDG_RUNTIME_DIR}/tractor/` subdir by
+    default but equivalents are mapped for each platform using
+    the lovely `platformdirs`.
 
     '''
-    rtdir: Path = _rtdir / subdir
+    rt_dir: Path = Path(
-    if not rtdir.is_dir():
+        platformdirs.user_runtime_dir(
-        rtdir.mkdir()
+            appname='tractor',
-    return rtdir
+        ),
+    )
+    if subdir:
+        rt_dir: Path = rt_dir / subdir
+
+    if not rt_dir.is_dir():
+        rt_dir.mkdir()
+
+    return rt_dir
 
 
 def current_ipc_protos() -> list[str]:

tractor/devx/debug/_trace.py

@@ -561,6 +561,9 @@ async def _pause(
             return
 
         elif isinstance(pause_err, trio.Cancelled):
+            __tracebackhide__: bool = False
+            # XXX, unmask to REPL it.
+            # mk_pdb().set_trace(frame=inspect.currentframe())
             _repl_fail_report += (
                 'You called `tractor.pause()` from an already cancelled scope!\n\n'
                 'Consider `await tractor.pause(shield=True)` to make it work B)\n'

tractor/log.py

@@ -14,11 +14,22 @@
 # 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/>.
 
-"""
+'''
-Log like a forester!
+An enhanced logging subsys.
 
-"""
+An extended logging layer using (for now) the stdlib's `logging`
++ `colorlog` which embeds concurrency-primitive/runtime info into
+records (headers) to help you better grok your distributed systems
+built on `tractor`.
+
+
+'''
 from collections.abc import Mapping
+from inspect import (
+    FrameInfo,
+    getmodule,
+    stack,
+)
 import sys
 import logging
 from logging import (
@@ -26,8 +37,10 @@ from logging import (
     Logger,
     StreamHandler,
 )
-import colorlog  # type: ignore
+from types import ModuleType
+import warnings
 
+import colorlog  # type: ignore
 import trio
 
 from ._state import current_actor
@@ -39,7 +52,7 @@ _default_loglevel: str = 'ERROR'
 # Super sexy formatting thanks to ``colorlog``.
 # (NOTE: we use the '{' format style)
 # Here, `thin_white` is just the layperson's gray.
-LOG_FORMAT = (
+LOG_FORMAT: str = (
     # "{bold_white}{log_color}{asctime}{reset}"
     "{log_color}{asctime}{reset}"
     " {bold_white}{thin_white}({reset}"
@@ -51,7 +64,7 @@ LOG_FORMAT = (
     " {reset}{bold_white}{thin_white}{message}"
 )
 
-DATE_FORMAT = '%b %d %H:%M:%S'
+DATE_FORMAT: str = '%b %d %H:%M:%S'
 
 # FYI, ERROR is 40
 # TODO: use a `bidict` to avoid the :155 check?
@@ -75,7 +88,10 @@ STD_PALETTE = {
     'TRANSPORT': 'cyan',
 }
 
-BOLD_PALETTE = {
+BOLD_PALETTE: dict[
+    str,
+    dict[int, str],
+] = {
     'bold': {
         level: f"bold_{color}" for level, color in STD_PALETTE.items()}
 }
@@ -97,10 +113,17 @@ def at_least_level(
     return False
 
 
-# TODO: this isn't showing the correct '{filename}'
+# TODO, compare with using a "filter" instead?
-# as it did before..
+# - https://stackoverflow.com/questions/60691759/add-information-to-every-log-message-in-python-logging/61830838#61830838
+#  |_corresponding dict-config,
+#    https://stackoverflow.com/questions/7507825/where-is-a-complete-example-of-logging-config-dictconfig/7507842#7507842
+#  - [ ] what's the benefit/tradeoffs?
+#
 class StackLevelAdapter(LoggerAdapter):
+    '''
+    A (software) stack oriented logger "adapter".
 
+    '''
     def at_least_level(
         self,
         level: str,
@@ -284,7 +307,9 @@ class ActorContextInfo(Mapping):
 
 def get_logger(
     name: str|None = None,
-    _root_name: str = _proj_name,
+    pkg_name: str = _proj_name,
+    # XXX, deprecated, use ^
+    _root_name: str|None = None,
 
     logger: Logger|None = None,
 
@@ -293,22 +318,89 @@ def get_logger(
     #  |_https://stackoverflow.com/questions/7507825/where-is-a-complete-example-of-logging-config-dictconfig
     #  |_https://docs.python.org/3/library/logging.config.html#configuration-dictionary-schema
     subsys_spec: str|None = None,
+    mk_sublog: bool = True,
 
 ) -> StackLevelAdapter:
     '''
     Return the `tractor`-library root logger or a sub-logger for
     `name` if provided.
 
+    When `name` is left null we try to auto-detect the caller's
+    `mod.__name__` and use that as a the sub-logger key.
+    This allows for example creating a module level instance like,
+
+    .. code:: python
+
+        log = tractor.log.get_logger(_root_name='mylib')
+
+    and by default all console record headers will show the caller's
+    (of any `log.<level>()`-method) correct sub-pkg's
+    + py-module-file.
+
     '''
+    if _root_name:
+        msg: str = (
+            'The `_root_name: str` param of `get_logger()` is now deprecated.\n'
+            'Use the new `pkg_name: str` instead, it is the same usage.\n'
+        )
+        warnings.warn(
+            msg,
+            DeprecationWarning,
+            stacklevel=2,
+        )
+    pkg_name: str = _root_name or pkg_name
     log: Logger
-    log = rlog = logger or logging.getLogger(_root_name)
+    log = rlog = logger or logging.getLogger(pkg_name)
+
+    # Implicitly introspect the caller's module-name whenever `name`
+    # if left as the null default.
+    #
+    # When the `pkg_name` is `in` in the `mod.__name__` we presume
+    # this instance can be created as a sub-`StackLevelAdapter` and
+    # that the intention is get free module-path tracing and
+    # filtering (well once we implement that) oriented around the
+    # py-module code hierarchy of the consuming project.
+    if (
+        pkg_name != _proj_name
+        and
+        name is None
+        and
+        mk_sublog
+    ):
+        callstack: list[FrameInfo] = stack()
+        caller_fi: FrameInfo = callstack[1]
+        caller_mod: ModuleType = getmodule(caller_fi.frame)
+        if caller_mod:
+            # ?how is this `mod.__name__` defined?
+            # -> well by how the mod is imported..
+            # |_https://stackoverflow.com/a/15883682
+            mod_name: str = caller_mod.__name__
+            mod_pkg: str = caller_mod.__package__
+            log.info(
+                f'Generating sub-logger name,\n'
+                f'{mod_pkg}.{mod_name}\n'
+            )
+            # if pkg_name in caller_mod.__package__:
+            #     from tractor.devx.debug import mk_pdb
+            #     mk_pdb().set_trace()
+
+            if (
+                pkg_name
+                # and
+                # pkg_name in mod_name
+            ):
+                name = mod_name
+
+    # XXX, lowlevel debuggin..
+    # if pkg_name != _proj_name:
+        # from tractor.devx.debug import mk_pdb
+        # mk_pdb().set_trace()
 
     if (
-        name
-        and
         name != _proj_name
+        and
+        name
     ):
-
         # NOTE: for handling for modules that use `get_logger(__name__)`
         # we make the following stylistic choice:
         # - always avoid duplicate project-package token
@@ -318,24 +410,63 @@ def get_logger(
         #   since in python the {filename} is always this same
         #   module-file.
 
-        sub_name: None|str = None
+        rname: str = pkg_name
-        rname, _, sub_name = name.partition('.')
+        pkg_path: str = name
-        pkgpath, _, modfilename = sub_name.rpartition('.')
 
-        # NOTE: for tractor itself never include the last level
+        # ex. modden.runtime.progman
-        # module key in the name such that something like: eg.
+        # -> rname='modden', _, pkg_path='runtime.progman'
-        # 'tractor.trionics._broadcast` only includes the first
+        if pkg_name in name:
-        # 2 tokens in the (coloured) name part.
+            rname, _, pkg_path = name.partition('.')
-        if rname == 'tractor':
-            sub_name = pkgpath
 
-        if _root_name in sub_name:
+        # ex. modden.runtime.progman
-            duplicate, _, sub_name = sub_name.partition('.')
+        # -> pkgpath='runtime', _, leaf_mod='progman'
+        subpkg_path, _, leaf_mod = pkg_path.rpartition('.')
 
-        if not sub_name:
+        # NOTE: special usage for passing `name=__name__`,
+        #
+        # - remove duplication of any root-pkg-name in the
+        #   (sub/child-)logger name; i.e. never include the
+        #   `pkg_name` *twice* in the top-most-pkg-name/level
+        #
+        # -> this happens normally since it is added to `.getChild()`
+        #   and as the name of its root-logger.
+        #
+        # => So for ex. (module key in the name) something like
+        #   `name='tractor.trionics._broadcast` is passed,
+        #   only includes the first 2 sub-pkg name-tokens in the
+        #   child-logger's name; the colored "pkg-namespace" header
+        #   will then correctly show the same value as `name`.
+        if rname == pkg_name:
+            pkg_path = subpkg_path
+
+        # XXX, do some double-checks for duplication of,
+        # - root-pkg-name, already in root logger
+        # - leaf-module-name already in `{filename}` header-field
+        if pkg_name in pkg_path:
+            _duplicate, _, pkg_path = pkg_path.partition('.')
+            if _duplicate:
+                # assert _duplicate == rname
+                _root_log.warning(
+                    f'Duplicate pkg-name in sub-logger key?\n'
+                    f'pkg_name = {pkg_name!r}\n'
+                    f'pkg_path = {pkg_path!r}\n'
+                )
+
+        if (
+            leaf_mod
+            and
+            leaf_mod in pkg_path
+        ):
+            _root_log.warning(
+                f'Duplicate leaf-module-name in sub-logger key?\n'
+                f'leaf_mod = {leaf_mod!r}\n'
+                f'pkg_path = {pkg_path!r}\n'
+            )
+
+        if not pkg_path:
             log = rlog
-        else:
+        elif mk_sublog:
-            log = rlog.getChild(sub_name)
+            log = rlog.getChild(pkg_path)
 
         log.level = rlog.level
 
@@ -350,8 +481,13 @@ def get_logger(
     for name, val in CUSTOM_LEVELS.items():
         logging.addLevelName(val, name)
 
-        # ensure customs levels exist as methods
+        # ensure our custom adapter levels exist as methods
-        assert getattr(logger, name.lower()), f'Logger does not define {name}'
+        assert getattr(
+            logger,
+            name.lower()
+        ), (
+            f'Logger does not define {name}'
+        )
 
     return logger
 
@@ -425,4 +561,4 @@ def get_loglevel() -> str:
 
 
 # global module logger for tractor itself
-log: StackLevelAdapter = get_logger('tractor')
+_root_log: StackLevelAdapter = get_logger('tractor')

tractor/to_asyncio.py

@@ -94,10 +94,14 @@ else:
     QueueShutDown = False
 
 
-# TODO, generally speaking we can generalize this abstraction, a "SC linked
+# TODO, generally speaking we can generalize this abstraction as,
-# parent->child task pair", as the same "supervision scope primitive"
+#
-# **that is** our `._context.Context` with the only difference being
+# > A "SC linked, inter-event-loop" channel for comms between
-# in how the tasks conduct msg-passing comms.
+# > a `parent: trio.Task` -> `child: asyncio.Task` pair.
+#
+# It is **very similar** in terms of its operation as a "supervision
+# scope primitive" to that of our `._context.Context` with the only
+# difference being in how the tasks conduct msg-passing comms.
 #
 # For `LinkedTaskChannel` we are passing the equivalent of (once you
 # include all the recently added  `._trio/aio_to_raise`
@@ -122,6 +126,7 @@ class LinkedTaskChannel(
     task scheduled in the host loop.
 
     '''
+    # ?TODO, rename as `._aio_q` since it's 2-way?
     _to_aio: asyncio.Queue
     _from_aio: trio.MemoryReceiveChannel
 
@@ -235,9 +240,11 @@ class LinkedTaskChannel(
     #
     async def receive(self) -> Any:
         '''
-        Receive a value from the paired `asyncio.Task` with
+        Receive a value `trio.Task` <- `asyncio.Task`.
+
+        Note the tasks in each loop are "SC linked" as a pair with
         exception/cancel handling to teardown both sides on any
-        unexpected error.
+        unexpected error or cancellation.
 
         '''
         try:
@@ -261,15 +268,42 @@ class LinkedTaskChannel(
             ):
                 raise err
 
+    async def get(self) -> Any:
+        '''
+        Receive a value `asyncio.Task` <- `trio.Task`.
+
+        This is equiv to `await self._from_trio.get()`.
+
+        '''
+        return await self._to_aio.get()
+
     async def send(self, item: Any) -> None:
         '''
-        Send a value through to the asyncio task presuming
+        Send a value through `trio.Task` -> `asyncio.Task`
-        it defines a ``from_trio`` argument, if it does not
+        presuming
+        it defines a `from_trio` argument or makes calls
+        to `chan.get()` , if it does not
         this method will raise an error.
 
         '''
         self._to_aio.put_nowait(item)
 
+    # TODO? could we only compile-in this method on an instance
+    # handed to the `asyncio`-side, i.e. the fn invoked with
+    # `.open_channel_from()`.
+    def send_nowait(
+        self,
+        item: Any,
+    ) -> None:
+        '''
+        Send a value through FROM the `asyncio.Task` to
+        the `trio.Task` NON-BLOCKING.
+
+        This is equiv to `self._to_trio.send_nowait()`.
+
+        '''
+        self._to_trio.send_nowait(item)
+
     # TODO? needed?
     # async def wait_aio_complete(self) -> None:
     #     await self._aio_task_complete.wait()
@@ -337,9 +371,12 @@ def _run_asyncio_task(
 
     '''
     __tracebackhide__: bool = hide_tb
-    if not tractor.current_actor().is_infected_aio():
+    if not (actor := tractor.current_actor()).is_infected_aio():
         raise RuntimeError(
-            "`infect_asyncio` mode is not enabled!?"
+            f'`infect_asyncio: bool` mode is not enabled ??\n'
+            f'Ensure you pass `ActorNursery.start_actor(infect_asyncio=True)`\n'
+            f'\n'
+            f'{actor}\n'
         )
 
     # ITC (inter task comms), these channel/queue names are mostly from

uv.lock

@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.11"
 
 [[package]]
@@ -236,6 +236,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/9e/c3/059298687310d527a58bb01f3b1965787ee3b40dce76752eda8b44e9a2c5/pexpect-4.9.0-py2.py3-none-any.whl", hash = "sha256:7236d1e080e4936be2dc3e326cec0af72acf9212a7e1d060210e70a47e253523", size = 63772, upload-time = "2023-11-25T06:56:14.81Z" },
 ]
 
+[[package]]
+name = "platformdirs"
+version = "4.4.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/23/e8/21db9c9987b0e728855bd57bff6984f67952bea55d6f75e055c46b5383e8/platformdirs-4.4.0.tar.gz", hash = "sha256:ca753cf4d81dc309bc67b0ea38fd15dc97bc30ce419a7f58d13eb3bf14c4febf", size = 21634, upload-time = "2025-08-26T14:32:04.268Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/40/4b/2028861e724d3bd36227adfa20d3fd24c3fc6d52032f4a93c133be5d17ce/platformdirs-4.4.0-py3-none-any.whl", hash = "sha256:abd01743f24e5287cd7a5db3752faf1a2d65353f38ec26d98e25a6db65958c85", size = 18654, upload-time = "2025-08-26T14:32:02.735Z" },
+]
+
 [[package]]
 name = "pluggy"
 version = "1.5.0"
@@ -378,6 +387,7 @@ dependencies = [
     { name = "colorlog" },
     { name = "msgspec" },
     { name = "pdbp" },
+    { name = "platformdirs" },
     { name = "tricycle" },
     { name = "trio" },
     { name = "wrapt" },
@@ -403,6 +413,7 @@ requires-dist = [
     { name = "colorlog", specifier = ">=6.8.2,<7" },
     { name = "msgspec", specifier = ">=0.19.0" },
     { name = "pdbp", specifier = ">=1.6,<2" },
+    { name = "platformdirs", specifier = ">=4.4.0" },
     { name = "tricycle", specifier = ">=0.4.1,<0.5" },
     { name = "trio", specifier = ">0.27" },
     { name = "wrapt", specifier = ">=1.16.0,<2" },