Allow using dill for pickling

.github/workflows/run_tests.yml

@@ -8,7 +8,7 @@ jobs:
     tests:
         runs-on: ubuntu-latest
         strategy:
-            matrix: 
+            matrix:
                 python: ['3.5', '3.6', '3.7', '3.8', '3.9']
         name: aioprocessing ${{ matrix.python }} tests
         steps:
@@ -19,4 +19,9 @@ jobs:
             - name: Install Flake8
               run: pip install flake8
             - run: flake8 .
-            - run: python runtests.py
+            - run: python runtests.py -v --failfast
+              timeout-minutes: 1
+            # tests should also pass when using multiprocess (dill)
+            - run: pip install multiprocess
+            - run: python runtests.py -v --failfast
+              timeout-minutes: 1

README.md

@@ -5,7 +5,7 @@ aioprocessing
 
 `aioprocessing` provides asynchronous, [`asyncio`](https://docs.python.org/3/library/asyncio.html) compatible, coroutine 
 versions of many blocking instance methods on objects in the [`multiprocessing`](https://docs.python.org/3/library/multiprocessing.html) 
-library. Here's an example demonstrating the `aioprocessing` versions of 
+library. To use [`dill`](https://pypi.org/project/dill) for universal pickling, install using `pip install aioprocessing[dill]`. Here's an example demonstrating the `aioprocessing` versions of 
 `Event`, `Queue`, and `Lock`:
 
 ```python
@@ -66,6 +66,14 @@ seamlessly used inside of `asyncio` coroutines, without ever blocking
 the event loop.
 
 
+What's new
+----------
+
+`v2.0.0`
+
+- Add support for universal pickling using [`dill`](https://github.com/uqfoundation/dill), installable with `pip install aioprocessing[dill]`. The library will now attempt to import [`multiprocess`](https://github.com/uqfoundation/multiprocess), falling back to stdlib `multiprocessing`. Force stdlib behaviour by setting a non-empty environment variable `AIOPROCESSING_DILL_DISABLED=1`. This can be used to avoid [errors](https://github.com/dano/aioprocessing/pull/36#discussion_r631178933) when attempting to combine `aioprocessing[dill]` with stdlib `multiprocessing` based objects like `concurrent.futures.ProcessPoolExecutor`.
+
+
 How does it work?
 -----------------
 
@@ -132,4 +140,4 @@ Keep in mind that, while the API exposes coroutines for interacting with
 to a `ThreadPoolExecutor`, this means the caveats that apply with using
 `ThreadPoolExecutor` with `asyncio` apply: namely, you won't be able to
 cancel any of the coroutines, because the work being done in the worker
-thread can't be interrupted.
+thread can't be interrupted.

aioprocessing/__init__.py

@@ -1,5 +1,4 @@
-import multiprocessing
-
+from . import mp as multiprocessing  # noqa
 from .connection import *  # noqa
 from .managers import *  # noqa
 
@@ -27,8 +26,8 @@
 # is zero for an official release, positive for a development branch,
 # or negative for a release candidate or beta (after the base version
 # number has been incremented)
-version = "1.1.1"
-version_info = (1, 1, 1, 0)
+version = "2.0.0"
+version_info = (2, 0, 0, 0)
 
 if hasattr(multiprocessing, "get_context"):
 

aioprocessing/connection.py

@@ -1,12 +1,6 @@
 from concurrent.futures import ThreadPoolExecutor
-from multiprocessing.connection import (
-    Listener,
-    Client,
-    deliver_challenge,
-    answer_challenge,
-    wait,
-)
 
+from .mp import connection as _connection
 from .executor import CoroBuilder
 from .util import run_in_executor
 
@@ -42,12 +36,12 @@ def __exit__(self, *args, **kwargs):
 
 def AioClient(*args, **kwargs):
     """ Returns an AioConnection instance. """
-    conn = Client(*args, **kwargs)
+    conn = _connection.Client(*args, **kwargs)
     return AioConnection(conn)
 
 
 class AioListener(metaclass=CoroBuilder):
-    delegate = Listener
+    delegate = _connection.Listener
     coroutines = ["accept"]
 
     def accept(self):
@@ -64,14 +58,20 @@ def __exit__(self, *args, **kwargs):
 
 def coro_deliver_challenge(*args, **kwargs):
     executor = ThreadPoolExecutor(max_workers=1)
-    return run_in_executor(executor, deliver_challenge, *args, **kwargs)
+    return run_in_executor(
+        executor, _connection.deliver_challenge, *args, **kwargs
+    )
 
 
 def coro_answer_challenge(*args, **kwargs):
     executor = ThreadPoolExecutor(max_workers=1)
-    return run_in_executor(executor, answer_challenge, *args, **kwargs)
+    return run_in_executor(
+        executor, _connection.answer_challenge, *args, **kwargs
+    )
 
 
 def coro_wait(*args, **kwargs):
     executor = ThreadPoolExecutor(max_workers=1)
-    return run_in_executor(executor, wait, *args, **kwargs)
+    return run_in_executor(
+        executor, _connection.wait, *args, **kwargs
+    )

aioprocessing/executor.py

@@ -1,8 +1,8 @@
-from multiprocessing import cpu_count
 from functools import wraps
 from concurrent.futures import ThreadPoolExecutor
 
 from . import util
+from .mp import cpu_count
 
 
 def init_executor(func):

aioprocessing/locks.py

@@ -1,14 +1,14 @@
 from .executor import CoroBuilder
-from multiprocessing import (
+from .mp import (
     Event,
     Lock,
     RLock,
     BoundedSemaphore,
     Condition,
     Semaphore,
     Barrier,
+    util as _util,
 )
-from multiprocessing.util import register_after_fork
 
 __all__ = [
     "AioLock",
@@ -57,7 +57,7 @@ def __init__(self, *args, **kwargs):
         def _after_fork(obj):
             obj._threaded_acquire = False
 
-        register_after_fork(self, _after_fork)
+        _util.register_after_fork(self, _after_fork)
 
     def coro_acquire(self, *args, **kwargs):
         """ Non-blocking acquire.

aioprocessing/managers.py

@@ -10,20 +10,13 @@
     RLock,
     Semaphore,
 )
-from multiprocessing.managers import (
-    SyncManager,
-    MakeProxyType,
-    BarrierProxy,
-    EventProxy,
-    ConditionProxy,
-    AcquirerProxy,
-)
 
 from aioprocessing.locks import _ContextManager
 from .executor import _ExecutorMixin
+from .mp import managers as _managers
 
 
-AioBaseQueueProxy = MakeProxyType(
+AioBaseQueueProxy = _managers.MakeProxyType(
     "AioQueueProxy",
     (
         "task_done",
@@ -99,7 +92,7 @@ class AioQueueProxy(AioBaseQueueProxy, metaclass=ProxyCoroBuilder):
     coroutines = ["get", "put"]
 
 
-class AioAcquirerProxy(AcquirerProxy, metaclass=ProxyCoroBuilder):
+class AioAcquirerProxy(_managers.AcquirerProxy, metaclass=ProxyCoroBuilder):
     pool_workers = 1
     coroutines = ["acquire", "release"]
 
@@ -166,19 +159,19 @@ def __iter__(self):
         return _ContextManager(self)
 
 
-class AioBarrierProxy(BarrierProxy, metaclass=ProxyCoroBuilder):
+class AioBarrierProxy(_managers.BarrierProxy, metaclass=ProxyCoroBuilder):
     coroutines = ["wait"]
 
 
-class AioEventProxy(EventProxy, metaclass=ProxyCoroBuilder):
+class AioEventProxy(_managers.EventProxy, metaclass=ProxyCoroBuilder):
     coroutines = ["wait"]
 
 
-class AioConditionProxy(ConditionProxy, metaclass=ProxyCoroBuilder):
+class AioConditionProxy(_managers.ConditionProxy, metaclass=ProxyCoroBuilder):
     coroutines = ["wait", "wait_for"]
 
 
-class AioSyncManager(SyncManager):
+class AioSyncManager(_managers.SyncManager):
     """ A mp.Manager that provides asyncio-friendly objects. """
 
     pass

aioprocessing/mp.py

@@ -0,0 +1,10 @@
+# flake8: noqa
+import os
+try:
+    if os.environ.get("AIOPROCESSING_DILL_DISABLED"):
+        raise ImportError
+    from multiprocess import *
+    from multiprocess import connection, managers, util
+except ImportError:
+    from multiprocessing import *
+    from multiprocessing import connection, managers, util

aioprocessing/pool.py

@@ -1,8 +1,8 @@
-from multiprocessing import Pool
 from asyncio import Future
 import asyncio
 
 from .executor import CoroBuilder
+from .mp import Pool
 
 __all__ = ["AioPool"]
 

aioprocessing/process.py

@@ -1,6 +1,5 @@
-from multiprocessing import Process
-
 from .executor import CoroBuilder
+from .mp import Process
 
 __all__ = ["AioProcess"]
 

aioprocessing/queues.py

@@ -1,6 +1,5 @@
-from multiprocessing import Queue, SimpleQueue, JoinableQueue
-
 from .executor import CoroBuilder
+from .mp import Queue, SimpleQueue, JoinableQueue
 
 
 class AioBaseQueue(metaclass=CoroBuilder):

setup.py

@@ -16,6 +16,7 @@
     ),
     zip_safe=False,
     license="BSD",
+    extras_require={"dill": ["multiprocess"]},
     keywords="asyncio multiprocessing coroutine",
     url="https://github.com/dano/aioprocessing",
     long_description=readme,

tests/_base_test.py

@@ -1,6 +1,7 @@
 import asyncio
 import unittest
-import multiprocessing
+
+import aioprocessing.mp as multiprocessing
 
 
 class BaseTest(unittest.TestCase):

tests/connection_tests.py

@@ -1,10 +1,10 @@
 import unittest
-import multiprocessing
-from multiprocessing import Process
 from array import array
 
 import aioprocessing
+import aioprocessing.mp as multiprocessing
 from aioprocessing.connection import AioConnection, AioListener, AioClient
+from aioprocessing.mp import Process
 
 from ._base_test import BaseTest
 

tests/lock_tests.py

@@ -1,14 +1,15 @@
-import multiprocessing
 import sys
 import time
 import asyncio
 import unittest
 import traceback
+
 import aioprocessing
-from multiprocessing import Process, Event, Queue, get_all_start_methods
+import aioprocessing.mp as multiprocessing
+from aioprocessing.mp import Process, Event, Queue, get_all_start_methods
 
 try:
-    from multiprocessing import get_context
+    from aioprocessing.mp import get_context
 except ImportError:
 
     def get_context(param):

tests/pickle_test.py

@@ -1,5 +1,6 @@
 import pickle
 import unittest
+
 from aioprocessing.executor import _ExecutorMixin
 
 

tests/process_test.py

@@ -1,5 +1,5 @@
 import unittest
-import multiprocessing
+import aioprocessing.mp as multiprocessing
 
 import aioprocessing
 from ._base_test import BaseTest, _GenMixin

tests/queue_test.py

@@ -1,8 +1,8 @@
 import unittest
-import aioprocessing
-from multiprocessing import Process, Event
 from concurrent.futures import ProcessPoolExecutor
 
+import aioprocessing
+from aioprocessing.mp import Process, Event, util
 from ._base_test import BaseTest, _GenMixin
 
 
@@ -97,6 +97,11 @@ async def queue_put():
 
 
 class ManagerQueueTest(BaseTest):
+    @unittest.skipIf(
+        "multiprocess.util" in str(util),
+        "concurrent.futures is not yet supported by uqfoundation "
+        "(https://github.com/uqfoundation/pathos/issues/90)"
+    )
     def test_executor(self):
         m = aioprocessing.AioManager()
         q = m.AioQueue()