forked from celery/celery
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test_concurrency_processes.py
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test_concurrency_processes.py
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import sys
import unittest2 as unittest
from itertools import cycle
from celery.concurrency import processes as mp
from celery.datastructures import ExceptionInfo
from celery.utils import noop
class Object(object): # for writeable attributes.
def __init__(self, **kwargs):
[setattr(self, k, v) for k, v in kwargs.items()]
def to_excinfo(exc):
try:
raise exc
except:
return ExceptionInfo(sys.exc_info())
class MockResult(object):
def __init__(self, value, pid):
self.value = value
self.pid = pid
def worker_pids(self):
return [self.pid]
def get(self):
return self.value
class MockPool(object):
started = False
closed = False
joined = False
terminated = False
_state = None
def __init__(self, *args, **kwargs):
self.started = True
self._state = mp.RUN
self.processes = kwargs.get("processes")
self._pool = [Object(pid=i) for i in range(self.processes)]
self._current_proc = cycle(xrange(self.processes)).next
def close(self):
self.closed = True
self._state = "CLOSE"
def join(self):
self.joined = True
def terminate(self):
self.terminated = True
def apply_async(self, *args, **kwargs):
pass
class ExeMockPool(MockPool):
def apply_async(self, target, args=(), kwargs={}, callback=noop):
from threading import Timer
res = target(*args, **kwargs)
Timer(0.1, callback, (res, )).start()
return MockResult(res, self._current_proc())
class TaskPool(mp.TaskPool):
Pool = MockPool
class ExeMockTaskPool(mp.TaskPool):
Pool = ExeMockPool
class test_TaskPool(unittest.TestCase):
def test_start(self):
pool = TaskPool(10)
pool.start()
self.assertTrue(pool._pool.started)
_pool = pool._pool
pool.stop()
self.assertTrue(_pool.closed)
self.assertTrue(_pool.joined)
pool.stop()
pool.start()
_pool = pool._pool
pool.terminate()
pool.terminate()
self.assertTrue(_pool.terminated)
def test_on_worker_error(self):
scratch = [None]
def errback(einfo):
scratch[0] = einfo
pool = TaskPool(10)
exc = KeyError("foo")
pool.on_worker_error([errback], exc)
self.assertTrue(scratch[0])
self.assertIs(scratch[0].exception, exc)
self.assertTrue(scratch[0].traceback)
def test_on_ready_exception(self):
scratch = [None]
def errback(retval):
scratch[0] = retval
pool = TaskPool(10)
exc = to_excinfo(KeyError("foo"))
pool.on_ready([], [errback], exc)
self.assertEqual(exc, scratch[0])
def test_safe_apply_callback(self):
_good_called = [0]
_evil_called = [0]
def good(x):
_good_called[0] = 1
return x
def evil(x):
_evil_called[0] = 1
raise KeyError(x)
pool = TaskPool(10)
self.assertIsNone(pool.safe_apply_callback(good, 10))
self.assertIsNone(pool.safe_apply_callback(evil, 10))
self.assertTrue(_good_called[0])
self.assertTrue(_evil_called[0])
def test_on_ready_value(self):
scratch = [None]
def callback(retval):
scratch[0] = retval
pool = TaskPool(10)
retval = "the quick brown fox"
pool.on_ready([callback], [], retval)
self.assertEqual(retval, scratch[0])
def test_on_ready_exit_exception(self):
pool = TaskPool(10)
exc = to_excinfo(SystemExit("foo"))
self.assertRaises(SystemExit, pool.on_ready, [], [], exc)
def test_apply_async(self):
pool = TaskPool(10)
pool.start()
pool.apply_async(lambda x: x, (2, ), {})
def test_info(self):
pool = TaskPool(10)
procs = [Object(pid=i) for i in range(pool.processes)]
pool._pool = Object(_pool=procs,
_maxtasksperchild=None,
timeout=10,
soft_timeout=5)
info = pool.info
self.assertEqual(info["max-concurrency"], pool.processes)
self.assertEqual(len(info["processes"]), pool.processes)
self.assertIsNone(info["max-tasks-per-child"])
self.assertEqual(info["timeouts"], (5, 10))