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import os
import time
import pickle
import signal
import unittest
import threading
import dataclasses
import multiprocessing
from concurrent.futures import CancelledError, TimeoutError
from pebble import concurrent, ProcessExpired, ProcessPool
# set start method
supported = False
mp_context = None
methods = multiprocessing.get_all_start_methods()
if 'spawn' in methods:
try:
mp_context = multiprocessing.get_context('spawn')
if mp_context.get_start_method() == 'spawn':
supported = True
else:
raise Exception(mp_context.get_start_method())
except RuntimeError: # child process
pass
else:
mp_context = multiprocessing.get_context()
def not_decorated(argument, keyword_argument=0):
return argument + keyword_argument
@concurrent.process(context=mp_context)
def decorated(argument, keyword_argument=0):
"""A docstring."""
return argument + keyword_argument
@concurrent.process(context=mp_context)
def error_decorated():
raise RuntimeError("BOOM!")
@concurrent.process(context=mp_context)
def error_returned():
return RuntimeError("BOOM!")
@concurrent.process(context=mp_context)
def pickling_error_decorated():
event = threading.Event()
return event
@dataclasses.dataclass(frozen=True)
class FrozenError(Exception):
pass
@concurrent.process(context=mp_context)
def frozen_error_decorated():
raise FrozenError()
@concurrent.process(context=mp_context)
def critical_decorated():
os._exit(123)
@concurrent.process(context=mp_context)
def decorated_cancel():
time.sleep(10)
@concurrent.process(timeout=0.1, context=mp_context)
def long_decorated():
time.sleep(10)
@concurrent.process(timeout=0.1, context=mp_context)
def sigterm_decorated():
signal.signal(signal.SIGTERM, signal.SIG_IGN)
time.sleep(10)
@concurrent.process(daemon=False, context=mp_context)
def daemon_keyword_decorated():
return multiprocessing.current_process().daemon
@concurrent.process(pool=ProcessPool(1, context=mp_context))
def pool_decorated(_argument, _keyword_argument=0):
return multiprocessing.current_process().pid
class ProcessConcurrentObj:
a = 0
def __init__(self):
self.b = 1
@classmethod
@concurrent.process(context=mp_context)
def clsmethod(cls):
return cls.a
@concurrent.process(context=mp_context)
def instmethod(self):
return self.b
@unittest.skipIf(not supported, "Start method is not supported")
class ProcessConcurrentSub1(ProcessConcurrentObj):
@classmethod
@concurrent.process(context=mp_context)
def clsmethod(cls):
return cls.a + 1
@concurrent.process(context=mp_context)
def instmethod(self):
return self.b + 1
class ProcessConcurrentSub2(ProcessConcurrentObj):
@classmethod
@concurrent.process(context=mp_context)
def clsmethod(cls):
return cls.a + 2
@concurrent.process(context=mp_context)
def instmethod(self):
return self.b + 2
class CallableClass:
def __call__(self, argument, keyword_argument=0):
return argument + keyword_argument
class TestProcessConcurrent(unittest.TestCase):
def setUp(self):
self.results = 0
self.exception = None
self.event = threading.Event()
self.event.clear()
self.concurrentobj = ProcessConcurrentObj()
self.concurrentobj1 = ProcessConcurrentSub1()
self.concurrentobj2 = ProcessConcurrentSub2()
def callback(self, future):
try:
self.results = future.result()
except (ProcessExpired, RuntimeError, TimeoutError) as error:
self.exception = error
finally:
self.event.set()
def test_docstring(self):
"""Process Spawn docstring is preserved."""
self.assertEqual(decorated.__doc__, "A docstring.")
def test_wrong_timeout(self):
"""Process Spawn TypeError is raised if timeout is not number."""
with self.assertRaises(TypeError):
@concurrent.process(timeout='Foo', context=mp_context)
def function():
return
def test_class_method(self):
"""Process Spawn decorated classmethods."""
future = ProcessConcurrentObj.clsmethod()
self.assertEqual(future.result(), 0)
future = ProcessConcurrentSub1.clsmethod()
self.assertEqual(future.result(), 1)
future = ProcessConcurrentSub2.clsmethod()
self.assertEqual(future.result(), 2)
def test_instance_method(self):
"""Process Spawn decorated instance methods."""
future = self.concurrentobj.instmethod()
self.assertEqual(future.result(), 1)
future = self.concurrentobj1.instmethod()
self.assertEqual(future.result(), 2)
future = self.concurrentobj2.instmethod()
self.assertEqual(future.result(), 3)
def test_not_decorated_results(self):
"""Process Spawn results are produced."""
non_decorated = concurrent.process(not_decorated, context=mp_context)
future = non_decorated(1, 1)
self.assertEqual(future.result(), 2)
def test_decorated_results(self):
"""Process Spawn results are produced."""
future = decorated(1, 1)
self.assertEqual(future.result(), 2)
def test_decorated_results_callback(self):
"""Process Spawn results are forwarded to the callback."""
future = decorated(1, 1)
future.add_done_callback(self.callback)
self.event.wait(timeout=1)
self.assertEqual(self.results, 2)
def test_error_decorated(self):
"""Process Spawn errors are raised by future.result."""
future = error_decorated()
with self.assertRaises(RuntimeError):
future.result()
def test_error_returned(self):
"""Process Spawn returned errors are returned by future.result."""
future = error_returned()
self.assertIsInstance(future.result(), RuntimeError)
def test_error_decorated_callback(self):
"""Process Spawn errors are forwarded to callback."""
future = error_decorated()
future.add_done_callback(self.callback)
self.event.wait(timeout=1)
self.assertTrue(isinstance(self.exception, RuntimeError),
msg=str(self.exception))
def test_pickling_error_decorated(self):
"""Process Spawn pickling errors are raised by future.result."""
future = pickling_error_decorated()
with self.assertRaises((pickle.PicklingError, TypeError)):
future.result()
def test_error_decorated(self):
"""Process Fork errors are raised by future.result."""
future = error_decorated()
with self.assertRaises(RuntimeError):
future.result()
def test_timeout_decorated(self):
"""Process Spawn raises TimeoutError if so."""
future = long_decorated()
with self.assertRaises(TimeoutError):
future.result()
def test_timeout_decorated_callback(self):
"""Process Spawn TimeoutError is forwarded to callback."""
future = long_decorated()
future.add_done_callback(self.callback)
self.event.wait(timeout=1)
self.assertTrue(isinstance(self.exception, TimeoutError),
msg=str(self.exception))
def test_decorated_dead_process(self):
"""Process Spawn ProcessExpired is raised if process dies."""
future = critical_decorated()
with self.assertRaises(ProcessExpired) as exc_ctx:
future.result()
self.assertEqual(exc_ctx.exception.exitcode, 123)
self.assertIsInstance(exc_ctx.exception.pid, int)
def test_timeout_decorated_callback(self):
"""Process Spawn ProcessExpired is forwarded to callback."""
future = critical_decorated()
future.add_done_callback(self.callback)
self.event.wait(timeout=1)
self.assertTrue(isinstance(self.exception, ProcessExpired),
msg=str(self.exception))
def test_cancel_decorated(self):
"""Process Spawn raises CancelledError if future was cancelled."""
future = decorated_cancel()
future.cancel()
self.assertRaises(CancelledError, future.result)
@unittest.skipIf(os.name == 'nt', "Test won't run on Windows.")
def test_decorated_ignoring_sigterm(self):
"""Process Spawn Concurrent ignored SIGTERM signal are handled on Unix."""
future = sigterm_decorated()
with self.assertRaises(TimeoutError):
future.result()
def test_daemon_keyword_decorated(self):
"""Daemon keyword can be passed to a decorated function and spawns correctly."""
f = daemon_keyword_decorated()
dec_out = f.result()
self.assertEqual(dec_out, False)
def test_callable_objects(self):
"""Callable objects are correctly handled."""
callable_object = concurrent.process(context=mp_context)(CallableClass())
f = callable_object(1)
self.assertEqual(f.result(), 1)
def test_pool_decorated(self):
"""Process Spawn pool decorated function."""
future1 = pool_decorated(1, 1)
future2 = pool_decorated(1, 1)
self.assertEqual(future1.result(), future2.result())
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