generated from daniil-berg/boilerplate-py
renamed "closing" a pool to "locking" it
This commit is contained in:
parent
012c8ac639
commit
bc9d2f243e
@ -1,6 +1,6 @@
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[metadata]
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name = asyncio-taskpool
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version = 0.1.7
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version = 0.2.0
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author = Daniil Fajnberg
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author_email = mail@daniil.fajnberg.de
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description = Dynamically manage pools of asyncio tasks
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@ -2,7 +2,7 @@ class PoolException(Exception):
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pass
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class PoolIsClosed(PoolException):
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class PoolIsLocked(PoolException):
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pass
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@ -22,7 +22,7 @@ class InvalidTaskID(PoolException):
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pass
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class PoolStillOpen(PoolException):
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class PoolStillUnlocked(PoolException):
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pass
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@ -31,7 +31,7 @@ class BaseTaskPool:
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"""Initializes the necessary internal attributes and adds the new pool to the general pools list."""
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self._enough_room: Semaphore = Semaphore()
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self.pool_size = pool_size
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self._open: bool = True
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self._locked: bool = False
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self._counter: int = 0
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self._running: Dict[int, Task] = {}
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self._cancelled: Dict[int, Task] = {}
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@ -71,9 +71,21 @@ class BaseTaskPool:
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self._pool_size = value
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@property
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def is_open(self) -> bool:
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"""Returns `True` if more the pool has not been closed yet."""
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return self._open
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def is_locked(self) -> bool:
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"""Returns `True` if more the pool has been locked (see below)."""
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return self._locked
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def lock(self) -> None:
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"""Disallows any more tasks to be started in the pool."""
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if not self._locked:
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self._locked = True
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log.info("%s is locked!", str(self))
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def unlock(self) -> None:
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"""Allows new tasks to be started in the pool."""
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if self._locked:
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self._locked = False
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log.info("%s was unlocked.", str(self))
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@property
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def num_running(self) -> int:
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@ -187,7 +199,7 @@ class BaseTaskPool:
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finally:
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await self._task_ending(task_id, custom_callback=end_callback)
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async def _start_task(self, awaitable: Awaitable, ignore_closed: bool = False, end_callback: EndCallbackT = None,
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async def _start_task(self, awaitable: Awaitable, ignore_lock: bool = False, end_callback: EndCallbackT = None,
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cancel_callback: CancelCallbackT = None) -> int:
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"""
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Starts a coroutine as a new task in the pool.
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@ -197,8 +209,8 @@ class BaseTaskPool:
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Args:
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awaitable:
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The actual coroutine to be run within the task pool.
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ignore_closed (optional):
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If `True`, even if the pool is closed, the task will still be started.
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ignore_lock (optional):
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If `True`, even if the pool is locked, the task will still be started.
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end_callback (optional):
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A callback to execute after the task has ended.
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It is run with the task's ID as its only positional argument.
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@ -208,12 +220,12 @@ class BaseTaskPool:
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Raises:
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`asyncio_taskpool.exceptions.NotCoroutine` if `awaitable` is not a coroutine.
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`asyncio_taskpool.exceptions.PoolIsClosed` if the pool has been closed and `ignore_closed` is `False`.
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`asyncio_taskpool.exceptions.PoolIsLocked` if the pool has been locked and `ignore_lock` is `False`.
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"""
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if not iscoroutine(awaitable):
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raise exceptions.NotCoroutine(f"Not awaitable: {awaitable}")
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if not (self.is_open or ignore_closed):
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raise exceptions.PoolIsClosed("Cannot start new tasks")
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if self._locked and not ignore_lock:
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raise exceptions.PoolIsLocked("Cannot start new tasks")
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await self._enough_room.acquire()
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task_id = self._counter
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self._counter += 1
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@ -303,16 +315,11 @@ class BaseTaskPool:
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self._interrupt_flag.clear()
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return results
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def close(self) -> None:
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"""Disallows any more tasks to be started in the pool."""
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self._open = False
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log.info("%s is closed!", str(self))
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async def gather(self, return_exceptions: bool = False):
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"""
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Calls `asyncio.gather` on **all** tasks from the pool, returns their results, and forgets the tasks.
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The `close()` method must have been called prior to this.
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The `lock()` method must have been called prior to this.
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Note that there may be an unknown number of coroutine functions "queued" to be run as tasks.
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This can happen, if for example the `TaskPool.map` method was called with `num_tasks` set to a number smaller
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@ -327,10 +334,10 @@ class BaseTaskPool:
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return_exceptions (optional): Passed directly into `gather`.
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Raises:
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`asyncio_taskpool.exceptions.PoolStillOpen` if the pool has not been closed yet.
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`asyncio_taskpool.exceptions.PoolStillUnlocked` if the pool has not been locked yet.
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"""
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if self._open:
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raise exceptions.PoolStillOpen("Pool must be closed, before tasks can be gathered")
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if not self._locked:
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raise exceptions.PoolStillUnlocked("Pool must be locked, before tasks can be gathered")
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await gather(*self._before_gathering)
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results = await gather(*self._ended.values(), *self._cancelled.values(), *self._running.values(),
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return_exceptions=return_exceptions)
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@ -415,7 +422,7 @@ class TaskPool(BaseTaskPool):
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Raises:
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`NotCoroutine` if `func` is not a coroutine function.
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`PoolIsClosed` if the pool has been closed already.
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`PoolIsLocked` if the pool has been locked already.
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"""
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ids = await gather(*(self._apply_one(func, args, kwargs, end_callback, cancel_callback) for _ in range(num)))
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# TODO: for some reason PyCharm wrongly claims that `gather` returns a tuple of exceptions
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@ -468,7 +475,7 @@ class TaskPool(BaseTaskPool):
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try:
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await self._start_task(
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star_function(func, arg, arg_stars=arg_stars),
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ignore_closed=True,
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ignore_lock=True,
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end_callback=partial(TaskPool._queue_callback, self, q=q, first_batch_started=first_batch_started,
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func=func, arg_stars=arg_stars, end_callback=end_callback,
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cancel_callback=cancel_callback),
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@ -579,10 +586,10 @@ class TaskPool(BaseTaskPool):
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It is run with the task's ID as its only positional argument.
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Raises:
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`asyncio_taskpool.exceptions.PoolIsClosed` if the pool has been closed.
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`asyncio_taskpool.exceptions.PoolIsLocked` if the pool has been locked.
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"""
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if not self.is_open:
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raise exceptions.PoolIsClosed("Cannot start new tasks")
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if not self._locked:
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raise exceptions.PoolIsLocked("Cannot start new tasks")
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args_queue = self._set_up_args_queue(args_iter, num_tasks)
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# We need a flag to ensure that starting all tasks from the first batch here will not be blocked by the
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# `_queue_callback` triggered by one or more of them.
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@ -628,7 +635,7 @@ class TaskPool(BaseTaskPool):
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It is run with the task's ID as its only positional argument.
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Raises:
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`PoolIsClosed` if the pool has been closed.
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`PoolIsLocked` if the pool has been locked.
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`NotCoroutine` if `func` is not a coroutine function.
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"""
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await self._map(func, arg_iter, arg_stars=0, num_tasks=num_tasks,
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@ -68,7 +68,7 @@ class BaseTaskPoolTestCase(CommonTestCase):
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def test_init(self):
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self.assertIsInstance(self.task_pool._enough_room, asyncio.locks.Semaphore)
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self.assertTrue(self.task_pool._open)
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self.assertFalse(self.task_pool._locked)
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self.assertEqual(0, self.task_pool._counter)
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self.assertDictEqual(EMPTY_DICT, self.task_pool._running)
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self.assertDictEqual(EMPTY_DICT, self.task_pool._cancelled)
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@ -103,9 +103,23 @@ class BaseTaskPoolTestCase(CommonTestCase):
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self.task_pool.pool_size = new_size = 69
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self.assertEqual(new_size, self.task_pool._pool_size)
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def test_is_open(self):
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self.task_pool._open = FOO
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self.assertEqual(FOO, self.task_pool.is_open)
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def test_is_locked(self):
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self.task_pool._locked = FOO
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self.assertEqual(FOO, self.task_pool.is_locked)
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def test_lock(self):
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assert not self.task_pool._locked
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self.task_pool.lock()
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self.assertTrue(self.task_pool._locked)
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self.task_pool.lock()
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self.assertTrue(self.task_pool._locked)
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def test_unlock(self):
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self.task_pool._locked = True
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self.task_pool.unlock()
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self.assertFalse(self.task_pool._locked)
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self.task_pool.unlock()
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self.assertFalse(self.task_pool._locked)
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def test_num_running(self):
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self.task_pool._running = ['foo', 'bar', 'baz']
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@ -211,11 +225,9 @@ class BaseTaskPoolTestCase(CommonTestCase):
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@patch.object(pool, 'create_task')
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@patch.object(pool.BaseTaskPool, '_task_wrapper', new_callable=MagicMock)
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@patch.object(pool.BaseTaskPool, '_task_name', return_value=FOO)
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@patch.object(pool.BaseTaskPool, 'is_open', new_callable=PropertyMock)
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async def test__start_task(self, mock_is_open: MagicMock, mock__task_name: MagicMock,
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mock__task_wrapper: AsyncMock, mock_create_task: MagicMock):
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async def test__start_task(self, mock__task_name: MagicMock, mock__task_wrapper: AsyncMock,
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mock_create_task: MagicMock):
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def reset_mocks() -> None:
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mock_is_open.reset_mock()
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mock__task_name.reset_mock()
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mock__task_wrapper.reset_mock()
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mock_create_task.reset_mock()
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@ -226,31 +238,27 @@ class BaseTaskPoolTestCase(CommonTestCase):
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self.task_pool._counter = count = 123
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self.task_pool._enough_room._value = room = 123
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def check_nothing_changed() -> None:
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self.assertEqual(count, self.task_pool._counter)
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self.assertNotIn(count, self.task_pool._running)
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self.assertEqual(room, self.task_pool._enough_room._value)
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mock__task_name.assert_not_called()
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mock__task_wrapper.assert_not_called()
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mock_create_task.assert_not_called()
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reset_mocks()
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with self.assertRaises(exceptions.NotCoroutine):
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await self.task_pool._start_task(MagicMock(), end_callback=mock_end_cb, cancel_callback=mock_cancel_cb)
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self.assertEqual(count, self.task_pool._counter)
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self.assertNotIn(count, self.task_pool._running)
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self.assertEqual(room, self.task_pool._enough_room._value)
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mock_is_open.assert_not_called()
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mock__task_name.assert_not_called()
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mock__task_wrapper.assert_not_called()
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mock_create_task.assert_not_called()
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reset_mocks()
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check_nothing_changed()
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mock_is_open.return_value = ignore_closed = False
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self.task_pool._locked = True
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ignore_closed = False
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mock_awaitable = mock_coroutine()
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with self.assertRaises(exceptions.PoolIsClosed):
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with self.assertRaises(exceptions.PoolIsLocked):
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await self.task_pool._start_task(mock_awaitable, ignore_closed,
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end_callback=mock_end_cb, cancel_callback=mock_cancel_cb)
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await mock_awaitable
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self.assertEqual(count, self.task_pool._counter)
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self.assertNotIn(count, self.task_pool._running)
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self.assertEqual(room, self.task_pool._enough_room._value)
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mock_is_open.assert_called_once_with()
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mock__task_name.assert_not_called()
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mock__task_wrapper.assert_not_called()
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mock_create_task.assert_not_called()
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reset_mocks()
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check_nothing_changed()
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ignore_closed = True
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mock_awaitable = mock_coroutine()
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@ -261,7 +269,6 @@ class BaseTaskPoolTestCase(CommonTestCase):
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self.assertEqual(count + 1, self.task_pool._counter)
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self.assertEqual(mock_task, self.task_pool._running[count])
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self.assertEqual(room - 1, self.task_pool._enough_room._value)
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mock_is_open.assert_called_once_with()
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mock__task_name.assert_called_once_with(count)
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mock__task_wrapper.assert_called_once_with(mock_awaitable, count, mock_end_cb, mock_cancel_cb)
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mock_create_task.assert_called_once_with(mock_wrapped, name=FOO)
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@ -280,7 +287,6 @@ class BaseTaskPoolTestCase(CommonTestCase):
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self.assertEqual(count + 1, self.task_pool._counter)
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self.assertNotIn(count, self.task_pool._running)
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self.assertEqual(room, self.task_pool._enough_room._value)
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mock_is_open.assert_called_once_with()
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mock__task_name.assert_called_once_with(count)
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mock__task_wrapper.assert_called_once_with(mock_awaitable, count, mock_end_cb, mock_cancel_cb)
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mock_create_task.assert_called_once_with(mock_wrapped, name=FOO)
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@ -345,11 +351,6 @@ class BaseTaskPoolTestCase(CommonTestCase):
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self.assertDictEqual(self.task_pool._ended, EMPTY_DICT)
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self.assertDictEqual(self.task_pool._cancelled, EMPTY_DICT)
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def test_close(self):
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assert self.task_pool._open
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self.task_pool.close()
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self.assertFalse(self.task_pool._open)
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async def test_gather(self):
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test_exception = TestException()
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mock_ended_func, mock_cancelled_func = AsyncMock(return_value=FOO), AsyncMock(side_effect=test_exception)
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@ -361,8 +362,8 @@ class BaseTaskPoolTestCase(CommonTestCase):
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self.task_pool._running = running = {789: mock_running_func()}
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self.task_pool._interrupt_flag.set()
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assert self.task_pool._open
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with self.assertRaises(exceptions.PoolStillOpen):
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assert not self.task_pool._locked
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with self.assertRaises(exceptions.PoolStillUnlocked):
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await self.task_pool.gather()
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self.assertDictEqual(self.task_pool._ended, ended)
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self.assertDictEqual(self.task_pool._cancelled, cancelled)
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@ -370,7 +371,7 @@ class BaseTaskPoolTestCase(CommonTestCase):
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self.assertListEqual(self.task_pool._before_gathering, before_gather)
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self.assertTrue(self.task_pool._interrupt_flag.is_set())
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self.task_pool._open = False
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self.task_pool._locked = True
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def check_assertions(output) -> None:
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self.assertListEqual([FOO, test_exception, BAR], output)
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@ -449,7 +450,7 @@ class TaskPoolTestCase(CommonTestCase):
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mock_flag, end_cb, cancel_cb = MagicMock(), MagicMock(), MagicMock()
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self.assertIsNone(await self.task_pool._queue_consumer(q, mock_flag, mock_func, stars, end_cb, cancel_cb))
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self.assertTrue(q.empty())
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mock__start_task.assert_awaited_once_with(awaitable, ignore_closed=True,
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mock__start_task.assert_awaited_once_with(awaitable, ignore_lock=True,
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end_callback=queue_callback, cancel_callback=cancel_cb)
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mock_star_function.assert_called_once_with(mock_func, arg, arg_stars=stars)
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mock_partial.assert_called_once_with(pool.TaskPool._queue_callback, self.task_pool,
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@ -459,7 +460,7 @@ class TaskPoolTestCase(CommonTestCase):
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mock_star_function.reset_mock()
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mock_partial.reset_mock()
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self.assertIsNone(await self.task_pool._queue_consumer(q, mock_func, stars, end_cb, cancel_cb))
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self.assertIsNone(await self.task_pool._queue_consumer(q, mock_flag, mock_func, stars, end_cb, cancel_cb))
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self.assertTrue(q.empty())
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mock__start_task.assert_not_awaited()
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mock_star_function.assert_not_called()
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@ -528,9 +529,8 @@ class TaskPoolTestCase(CommonTestCase):
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@patch.object(pool, 'Event')
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@patch.object(pool.TaskPool, '_queue_consumer')
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@patch.object(pool.TaskPool, '_set_up_args_queue')
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@patch.object(pool.TaskPool, 'is_open', new_callable=PropertyMock)
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async def test__map(self, mock_is_open: MagicMock, mock__set_up_args_queue: MagicMock,
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mock__queue_consumer: AsyncMock, mock_event_cls: MagicMock):
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async def test__map(self, mock__set_up_args_queue: MagicMock, mock__queue_consumer: AsyncMock,
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mock_event_cls: MagicMock):
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qsize = 4
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mock__set_up_args_queue.return_value = mock_q = MagicMock(qsize=MagicMock(return_value=qsize))
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mock_flag_set = MagicMock()
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@ -540,17 +540,14 @@ class TaskPoolTestCase(CommonTestCase):
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args_iter, num_tasks = (FOO, BAR, 1, 2, 3), 2
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end_cb, cancel_cb = MagicMock(), MagicMock()
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mock_is_open.return_value = False
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with self.assertRaises(exceptions.PoolIsClosed):
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self.task_pool._locked = False
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with self.assertRaises(exceptions.PoolIsLocked):
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await self.task_pool._map(mock_func, args_iter, stars, num_tasks, end_cb, cancel_cb)
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mock_is_open.assert_called_once_with()
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mock__set_up_args_queue.assert_not_called()
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mock__queue_consumer.assert_not_awaited()
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mock_flag_set.assert_not_called()
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mock_is_open.reset_mock()
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mock_is_open.return_value = True
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self.task_pool._locked = True
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self.assertIsNone(await self.task_pool._map(mock_func, args_iter, stars, num_tasks, end_cb, cancel_cb))
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mock__set_up_args_queue.assert_called_once_with(args_iter, num_tasks)
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mock__queue_consumer.assert_has_awaits(qsize * [call(mock_q, mock_flag, mock_func, arg_stars=stars,
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@ -7,13 +7,13 @@ The minimum required setup is a "worker" coroutine function that can do somethin
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The following demo code enables full log output first for additional clarity. It is complete and should work as is.
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### Code
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```python
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import logging
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import asyncio
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from asyncio_taskpool.pool import SimpleTaskPool
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logging.getLogger().setLevel(logging.NOTSET)
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logging.getLogger('asyncio_taskpool').addHandler(logging.StreamHandler())
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@ -38,7 +38,7 @@ async def main() -> None:
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await pool.start() # launches work task 3
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await asyncio.sleep(1.5) # lets the tasks work for a bit
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pool.stop(2) # cancels tasks 3 and 2
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pool.close() # required for the last line
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pool.lock() # required for the last line
|
||||
await pool.gather() # awaits all tasks, then flushes the pool
|
||||
|
||||
|
||||
@ -60,7 +60,7 @@ did 1
|
||||
did 1
|
||||
did 1
|
||||
did 0
|
||||
SimpleTaskPool-0 is closed!
|
||||
SimpleTaskPool-0 is locked!
|
||||
Cancelling SimpleTaskPool-0_Task-3 ...
|
||||
Cancelled SimpleTaskPool-0_Task-3
|
||||
Ended SimpleTaskPool-0_Task-3
|
||||
@ -86,13 +86,13 @@ As with the simple example, we need "worker" coroutine functions that can do som
|
||||
The following demo code enables full log output first for additional clarity. It is complete and should work as is.
|
||||
|
||||
### Code
|
||||
|
||||
```python
|
||||
import logging
|
||||
import asyncio
|
||||
|
||||
from asyncio_taskpool.pool import TaskPool
|
||||
|
||||
|
||||
logging.getLogger().setLevel(logging.NOTSET)
|
||||
logging.getLogger('asyncio_taskpool').addHandler(logging.StreamHandler())
|
||||
|
||||
@ -132,8 +132,8 @@ async def main() -> None:
|
||||
print("Calling `starmap`...")
|
||||
await pool.starmap(other_work, args_list, num_tasks=2)
|
||||
print("`starmap` returned")
|
||||
# Now we close the pool, so that we can safely await all our tasks.
|
||||
pool.close()
|
||||
# Now we lock the pool, so that we can safely await all our tasks.
|
||||
pool.lock()
|
||||
# Finally, we block, until all tasks have ended.
|
||||
print("Called `gather`")
|
||||
await pool.gather()
|
||||
@ -177,7 +177,7 @@ work with 150
|
||||
work with 150
|
||||
other_work with 8
|
||||
Ended TaskPool-0_Task-2 <--- here Task-2 makes room in the pool and unblocks `main()`
|
||||
TaskPool-0 is closed!
|
||||
TaskPool-0 is locked!
|
||||
Started TaskPool-0_Task-3
|
||||
other_work with 9
|
||||
`starmap` returned
|
||||
|
||||
@ -48,12 +48,12 @@ async def main() -> None:
|
||||
control_server_task = await UnixControlServer(pool, path='/tmp/py_asyncio_taskpool.sock').serve_forever()
|
||||
# We block until `.task_done()` has been called once by our workers for every item placed into the queue.
|
||||
await q.join()
|
||||
# Since we don't need any "work" done anymore, we can close our control server by cancelling the task.
|
||||
# Since we don't need any "work" done anymore, we can lock our control server by cancelling the task.
|
||||
control_server_task.cancel()
|
||||
# Since our workers should now be stuck waiting for more items to pick from the queue, but no items are left,
|
||||
# we can now safely cancel their tasks.
|
||||
pool.stop_all()
|
||||
pool.close()
|
||||
pool.lock()
|
||||
# Finally we allow for all tasks to do do their cleanup, if they need to do any, upon being cancelled.
|
||||
# We block until they all return or raise an exception, but since we are not interested in any of their exceptions,
|
||||
# we just silently collect their exceptions along with their return values.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user