First attempt at removing trip & updating hazmat -> lowlevel

.travis.yml

@@ -25,16 +25,16 @@ matrix:
         - name: "Python 3.7: multiprocessing"
           python: 3.7  # this works for Linux but is ignored on macOS or Windows
           env: SPAWN_BACKEND="mp"
-        - name: "Python 3.7: trio-run-in-process"
+        - name: "Python 3.7: trio"
           python: 3.7  # this works for Linux but is ignored on macOS or Windows
-          env: SPAWN_BACKEND="trio_run_in_process"
+          env: SPAWN_BACKEND="trio"
 
         - name: "Python 3.8: multiprocessing"
           python: 3.8  # this works for Linux but is ignored on macOS or Windows
           env: SPAWN_BACKEND="mp"
-        - name: "Python 3.8: trio-run-in-process"
+        - name: "Python 3.8: trio"
           python: 3.8  # this works for Linux but is ignored on macOS or Windows
-          env: SPAWN_BACKEND="trio_run_in_process"
+          env: SPAWN_BACKEND="trio"
 
 install:
     - cd $TRAVIS_BUILD_DIR

setup.py

@@ -39,7 +39,7 @@ setup(
     ],
     install_requires=[
         'msgpack', 'trio>0.8', 'async_generator', 'colorlog', 'wrapt',
-        'trio_typing', 'trio-run-in-process',
+        'trio_typing', 'cloudpickle',
     ],
     tests_require=['pytest'],
     python_requires=">=3.7",

tests/conftest.py

@@ -21,7 +21,7 @@ def pytest_addoption(parser):
 
     parser.addoption(
         "--spawn-backend", action="store", dest='spawn_backend',
-        default='trio_run_in_process',
+        default='trio',
         help="Processing spawning backend to use for test run",
     )
 
@@ -34,7 +34,7 @@ def pytest_configure(config):
 
     if backend == 'mp':
         tractor._spawn.try_set_start_method('spawn')
-    elif backend == 'trio_run_in_process':
+    elif backend == 'trio':
         tractor._spawn.try_set_start_method(backend)
 
 
@@ -56,7 +56,7 @@ def pytest_generate_tests(metafunc):
     if not spawn_backend:
         # XXX some weird windows bug with `pytest`?
         spawn_backend = 'mp'
-    assert spawn_backend in ('mp', 'trio_run_in_process')
+    assert spawn_backend in ('mp', 'trio')
 
     if 'start_method' in metafunc.fixturenames:
         if spawn_backend == 'mp':
@@ -67,11 +67,11 @@ def pytest_generate_tests(metafunc):
                 # removing XXX: the fork method is in general
                 # incompatible with trio's global scheduler state
                 methods.remove('fork')
-        elif spawn_backend == 'trio_run_in_process':
+        elif spawn_backend == 'trio':
             if platform.system() == "Windows":
                 pytest.fail(
                     "Only `--spawn-backend=mp` is supported on Windows")
 
-            methods = ['trio_run_in_process']
+            methods = ['trio']
 
         metafunc.parametrize("start_method", methods, scope='module')

tractor/_child.py

@@ -0,0 +1,13 @@
+import sys
+import trio
+import cloudpickle
+
+if __name__ == "__main__":
+    job = cloudpickle.load(sys.stdin.detach())
+
+    try:
+        result = trio.run(job)
+        cloudpickle.dump(sys.stdout.detach(), result)
+
+    except BaseException as err:
+        cloudpickle.dump(sys.stdout.detach(), err)

tractor/_entry.py

@@ -52,22 +52,12 @@ def _mp_main(
     log.info(f"Actor {actor.uid} terminated")
 
 
-async def _trip_main(
+async def _trio_main(
     actor: 'Actor',
     accept_addr: Tuple[str, int],
     parent_addr: Tuple[str, int] = None
 ) -> None:
-    """Entry point for a `trio_run_in_process` subactor.
 
-    Here we don't need to call `trio.run()` since trip does that as
-    part of its subprocess startup sequence.
-    """
-    if actor.loglevel is not None:
-        log.info(
-            f"Setting loglevel for {actor.uid} to {actor.loglevel}")
-        get_console_log(actor.loglevel)
-
-    log.info(f"Started new TRIP process for {actor.uid}")
     _state._current_actor = actor
+
     await actor._async_main(accept_addr, parent_addr=parent_addr)
-    log.info(f"Actor {actor.uid} terminated")

tractor/_spawn.py

@@ -1,14 +1,18 @@
 """
 Machinery for actor process spawning using multiple backends.
 """
+import sys
 import inspect
+import subprocess
 import multiprocessing as mp
 import platform
 from typing import Any, Dict, Optional
+from functools import partial
 
 import trio
+import cloudpickle
 from trio_typing import TaskStatus
-from async_generator import aclosing
+from async_generator import aclosing, asynccontextmanager
 
 try:
     from multiprocessing import semaphore_tracker  # type: ignore
@@ -21,12 +25,12 @@ except ImportError:
 from multiprocessing import forkserver  # type: ignore
 from typing import Tuple
 
-from . import _forkserver_override
+from . import _forkserver_override, _child
 from ._state import current_actor
 from .log import get_logger
 from ._portal import Portal
 from ._actor import Actor, ActorFailure
-from ._entry import _mp_main, _trip_main
+from ._entry import _mp_main, _trio_main
 
 
 log = get_logger('tractor')
@@ -41,14 +45,13 @@ if platform.system() == 'Windows':
     _ctx = mp.get_context("spawn")
 
     async def proc_waiter(proc: mp.Process) -> None:
-        await trio.hazmat.WaitForSingleObject(proc.sentinel)
+        await trio.lowlevel.WaitForSingleObject(proc.sentinel)
 else:
-    # *NIX systems use ``trio_run_in_process` as our default (for now)
-    import trio_run_in_process
-    _spawn_method = "trio_run_in_process"
+    # *NIX systems use ``trio`` primitives as our default
+    _spawn_method = "trio"
 
     async def proc_waiter(proc: mp.Process) -> None:
-        await trio.hazmat.wait_readable(proc.sentinel)
+        await trio.lowlevel.wait_readable(proc.sentinel)
 
 
 def try_set_start_method(name: str) -> Optional[mp.context.BaseContext]:
@@ -57,7 +60,7 @@ def try_set_start_method(name: str) -> Optional[mp.context.BaseContext]:
 
     If the desired method is not supported this function will error. On
     Windows the only supported option is the ``multiprocessing`` "spawn"
-    method. The default on *nix systems is ``trio_run_in_process``.
+    method. The default on *nix systems is ``trio``.
     """
     global _ctx
     global _spawn_method
@@ -69,7 +72,7 @@ def try_set_start_method(name: str) -> Optional[mp.context.BaseContext]:
 
     # no Windows support for trip yet
     if platform.system() != 'Windows':
-        methods += ['trio_run_in_process']
+        methods += ['trio']
 
     if name not in methods:
         raise ValueError(
@@ -78,7 +81,7 @@ def try_set_start_method(name: str) -> Optional[mp.context.BaseContext]:
     elif name == 'forkserver':
         _forkserver_override.override_stdlib()
         _ctx = mp.get_context(name)
-    elif name == 'trio_run_in_process':
+    elif name == 'trio':
         _ctx = None
     else:
         _ctx = mp.get_context(name)
@@ -153,6 +156,25 @@ async def cancel_on_completion(
         await portal.cancel_actor()
 
 
+@asynccontextmanager
+async def run_in_process(async_fn, *args, **kwargs):
+    encoded_job = cloudpickle.dumps(partial(async_fn, *args, **kwargs))
+    p = await trio.open_process(
+        [
+            sys.executable,
+            "-m",
+            _child.__name__
+        ],
+        stdin=subprocess.PIPE
+    )
+
+    await p.stdin.send_all(encoded_job)
+
+    yield p
+
+    #return cloudpickle.loads(p.stdout)
+
+
 async def new_proc(
     name: str,
     actor_nursery: 'ActorNursery',  # type: ignore
@@ -174,12 +196,9 @@ async def new_proc(
     subactor._spawn_method = _spawn_method
 
     async with trio.open_nursery() as nursery:
-        if use_trio_run_in_process or _spawn_method == 'trio_run_in_process':
-            if infect_asyncio:
-                raise NotImplementedError("Asyncio is incompatible with trip")
-            # trio_run_in_process
-            async with trio_run_in_process.open_in_process(
-                _trip_main,
+        if use_trio_run_in_process or _spawn_method == 'trio':
+            async with run_in_process(
+                _trio_main,
                 subactor,
                 bind_addr,
                 parent_addr,
@@ -203,7 +222,7 @@ async def new_proc(
                     cancel_scope = await nursery.start(
                         cancel_on_completion, portal, subactor, errors)
 
-                # TRIP blocks here until process is complete
+                # run_in_process blocks here until process is complete
         else:
             # `multiprocessing`
             assert _ctx

tractor/_state.py

@@ -30,7 +30,7 @@ class ActorContextInfo(Mapping):
     def __getitem__(self, key: str):
         try:
             return {
-                'task': trio.hazmat.current_task,
+                'task': trio.lowlevel.current_task,
                 'actor': current_actor
             }[key]().name
         except RuntimeError:

tractor/testing/_tractor_test.py

@@ -47,7 +47,7 @@ def tractor_test(fn):
             if platform.system() == "Windows":
                 start_method = 'spawn'
             else:
-                start_method = 'trio_run_in_process'
+                start_method = 'trio'
 
         if 'start_method' in inspect.signature(fn).parameters:
             # set of subprocess spawning backends