generated from daniil-berg/boilerplate-py
implemented working pool size limit; adjusted tests and examples; small renaming
This commit is contained in:
parent
a68e61dfa7
commit
2f0b08edf0
@ -2,13 +2,13 @@ import logging
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from asyncio import gather
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from asyncio.coroutines import iscoroutinefunction
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from asyncio.exceptions import CancelledError
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from asyncio.locks import Event
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from asyncio.locks import Event, Semaphore
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from asyncio.tasks import Task, create_task
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from math import inf
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from typing import Any, Awaitable, Callable, Dict, Iterable, Iterator, List, Optional, Tuple
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from . import exceptions
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from .types import ArgsT, KwArgsT, CoroutineFunc, FinalCallbackT, CancelCallbackT
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from .types import ArgsT, KwArgsT, CoroutineFunc, EndCallbackT, CancelCallbackT
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log = logging.getLogger(__name__)
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@ -26,7 +26,8 @@ class BaseTaskPool:
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def __init__(self, pool_size: int = inf, name: str = None) -> None:
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"""Initializes the necessary internal attributes and adds the new pool to the general pools list."""
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self.pool_size: int = pool_size
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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._counter: int = 0
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self._running: Dict[int, Task] = {}
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@ -37,13 +38,22 @@ class BaseTaskPool:
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self._name: str = name
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self._all_tasks_known_flag: Event = Event()
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self._all_tasks_known_flag.set()
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self._more_allowed_flag: Event = Event()
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self._check_more_allowed()
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log.debug("%s initialized", str(self))
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def __str__(self) -> str:
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return f'{self.__class__.__name__}-{self._name or self._idx}'
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@property
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def pool_size(self) -> int:
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return self._pool_size
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@pool_size.setter
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def pool_size(self, value: int) -> None:
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if value < 0:
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raise ValueError("Pool size can not be less than 0")
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self._enough_room._value = value
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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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@ -53,7 +63,7 @@ class BaseTaskPool:
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def num_running(self) -> int:
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"""
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Returns the number of tasks in the pool that are (at that moment) still running.
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At the moment a task's final callback function is fired, it is no longer considered to be running.
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At the moment a task's `end_callback` is fired, it is no longer considered to be running.
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"""
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return len(self._running)
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@ -61,7 +71,7 @@ class BaseTaskPool:
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def num_cancelled(self) -> int:
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"""
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Returns the number of tasks in the pool that have been cancelled through the pool (up until that moment).
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At the moment a task's cancel callback function is fired, it is considered cancelled and no longer running.
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At the moment a task's `cancel_callback` is fired, it is considered cancelled and no longer running.
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"""
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return len(self._cancelled)
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@ -69,9 +79,9 @@ class BaseTaskPool:
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def num_ended(self) -> int:
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"""
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Returns the number of tasks started through the pool that have stopped running (up until that moment).
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At the moment a task's final callback function is fired, it is considered ended.
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When a task is cancelled, it is not immediately considered ended; only after its cancel callback function has
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returned, does it then actually end.
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At the moment a task's `end_callback` is fired, it is considered ended.
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When a task is cancelled, it is not immediately considered ended; only after its `cancel_callback` has returned,
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does it then actually end.
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"""
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return len(self._ended)
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@ -88,18 +98,9 @@ class BaseTaskPool:
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Returns `False` only if (at that moment) the number of running tasks is below the pool's specified size.
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When the pool is full, any call to start a new task within it will block.
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"""
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return not self._more_allowed_flag.is_set()
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def _check_more_allowed(self) -> None:
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"""
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Sets or clears the internal event flag signalling whether or not the pool is full (i.e. whether more tasks can
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be started), if the current state of the pool demands it.
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"""
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if self.is_full and self.num_running < self.pool_size:
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self._more_allowed_flag.set()
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elif not self.is_full and self.num_running >= self.pool_size:
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self._more_allowed_flag.clear()
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return self._enough_room.locked()
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# TODO: Consider adding task group names
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def _task_name(self, task_id: int) -> str:
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"""Returns a standardized name for a task with a specific `task_id`."""
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return f'{self}_Task-{task_id}'
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@ -110,20 +111,20 @@ class BaseTaskPool:
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assert task is not None
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self._cancelled[task_id] = task
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self._ending += 1
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await _execute_function(custom_callback, args=(task_id, ))
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log.debug("Cancelled %s", self._task_name(task_id))
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await _execute_function(custom_callback, args=(task_id, ))
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async def _end_task(self, task_id: int, custom_callback: FinalCallbackT = None) -> None:
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async def _end_task(self, task_id: int, custom_callback: EndCallbackT = None) -> None:
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task = self._running.pop(task_id, None)
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if task is None:
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task = self._cancelled[task_id]
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self._ending -= 1
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self._ended[task_id] = task
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await _execute_function(custom_callback, args=(task_id, ))
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self._check_more_allowed()
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self._enough_room.release()
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log.info("Ended %s", self._task_name(task_id))
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await _execute_function(custom_callback, args=(task_id, ))
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async def _task_wrapper(self, awaitable: Awaitable, task_id: int, final_callback: FinalCallbackT = None,
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async def _task_wrapper(self, awaitable: Awaitable, task_id: int, end_callback: EndCallbackT = None,
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cancel_callback: CancelCallbackT = None) -> Any:
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log.info("Started %s", self._task_name(task_id))
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try:
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@ -131,20 +132,23 @@ class BaseTaskPool:
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except CancelledError:
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await self._cancel_task(task_id, custom_callback=cancel_callback)
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finally:
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await self._end_task(task_id, custom_callback=final_callback)
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await self._end_task(task_id, custom_callback=end_callback)
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def _start_task(self, awaitable: Awaitable, ignore_closed: bool = False, final_callback: FinalCallbackT = None,
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async def _start_task(self, awaitable: Awaitable, ignore_closed: bool = False, end_callback: EndCallbackT = None,
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cancel_callback: CancelCallbackT = None) -> int:
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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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# TODO: Implement this (and the dependent user-facing methods) as async to wait for room in the pool
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await self._enough_room.acquire()
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try:
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task_id = self._counter
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self._counter += 1
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self._running[task_id] = create_task(
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self._task_wrapper(awaitable, task_id, final_callback, cancel_callback),
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self._task_wrapper(awaitable, task_id, end_callback, cancel_callback),
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name=self._task_name(task_id)
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)
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self._check_more_allowed()
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except Exception as e:
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self._enough_room.release()
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raise e
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return task_id
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def _cancel_one(self, task_id: int, msg: str = None) -> None:
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@ -180,15 +184,15 @@ class BaseTaskPool:
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class TaskPool(BaseTaskPool):
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def _apply_one(self, func: CoroutineFunc, args: ArgsT = (), kwargs: KwArgsT = None,
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final_callback: FinalCallbackT = None, cancel_callback: CancelCallbackT = None) -> int:
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async def _apply_one(self, func: CoroutineFunc, args: ArgsT = (), kwargs: KwArgsT = None,
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end_callback: EndCallbackT = None, cancel_callback: CancelCallbackT = None) -> int:
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if kwargs is None:
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kwargs = {}
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return self._start_task(func(*args, **kwargs), final_callback=final_callback, cancel_callback=cancel_callback)
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return await self._start_task(func(*args, **kwargs), end_callback=end_callback, cancel_callback=cancel_callback)
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def apply(self, func: CoroutineFunc, args: ArgsT = (), kwargs: KwArgsT = None, num: int = 1,
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final_callback: FinalCallbackT = None, cancel_callback: CancelCallbackT = None) -> Tuple[int]:
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return tuple(self._apply_one(func, args, kwargs, final_callback, cancel_callback) for _ in range(num))
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async def apply(self, func: CoroutineFunc, args: ArgsT = (), kwargs: KwArgsT = None, num: int = 1,
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end_callback: EndCallbackT = None, cancel_callback: CancelCallbackT = None) -> Tuple[int]:
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return tuple(await self._apply_one(func, args, kwargs, end_callback, cancel_callback) for _ in range(num))
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@staticmethod
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def _get_next_coroutine(func: CoroutineFunc, args_iter: Iterator[Any], arg_stars: int = 0) -> Optional[Awaitable]:
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@ -204,54 +208,54 @@ class TaskPool(BaseTaskPool):
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return func(**arg)
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raise ValueError
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def _map(self, func: CoroutineFunc, args_iter: ArgsT, arg_stars: int = 0, num_tasks: int = 1,
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final_callback: FinalCallbackT = None, cancel_callback: CancelCallbackT = None) -> None:
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async def _map(self, func: CoroutineFunc, args_iter: ArgsT, arg_stars: int = 0, num_tasks: int = 1,
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end_callback: EndCallbackT = None, cancel_callback: CancelCallbackT = None) -> None:
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if self._all_tasks_known_flag.is_set():
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self._all_tasks_known_flag.clear()
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args_iter = iter(args_iter)
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def _start_next_coroutine() -> bool:
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async def _start_next_coroutine() -> bool:
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cor = self._get_next_coroutine(func, args_iter, arg_stars)
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if cor is None:
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self._all_tasks_known_flag.set()
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return True
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self._start_task(cor, ignore_closed=True, final_callback=_start_next, cancel_callback=cancel_callback)
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await self._start_task(cor, ignore_closed=True, end_callback=_start_next, cancel_callback=cancel_callback)
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return False
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async def _start_next(task_id: int) -> None:
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await _execute_function(final_callback, args=(task_id, ))
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_start_next_coroutine()
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await _start_next_coroutine()
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await _execute_function(end_callback, args=(task_id, ))
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for _ in range(num_tasks):
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reached_end = _start_next_coroutine()
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reached_end = await _start_next_coroutine()
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if reached_end:
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break
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def map(self, func: CoroutineFunc, args_iter: ArgsT, num_tasks: int = 1,
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final_callback: FinalCallbackT = None, cancel_callback: CancelCallbackT = None) -> None:
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self._map(func, args_iter, arg_stars=0, num_tasks=num_tasks,
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final_callback=final_callback, cancel_callback=cancel_callback)
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async def map(self, func: CoroutineFunc, args_iter: ArgsT, num_tasks: int = 1,
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end_callback: EndCallbackT = None, cancel_callback: CancelCallbackT = None) -> None:
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await self._map(func, args_iter, arg_stars=0, num_tasks=num_tasks,
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end_callback=end_callback, cancel_callback=cancel_callback)
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def starmap(self, func: CoroutineFunc, args_iter: Iterable[ArgsT], num_tasks: int = 1,
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final_callback: FinalCallbackT = None, cancel_callback: CancelCallbackT = None) -> None:
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self._map(func, args_iter, arg_stars=1, num_tasks=num_tasks,
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final_callback=final_callback, cancel_callback=cancel_callback)
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async def starmap(self, func: CoroutineFunc, args_iter: Iterable[ArgsT], num_tasks: int = 1,
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end_callback: EndCallbackT = None, cancel_callback: CancelCallbackT = None) -> None:
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await self._map(func, args_iter, arg_stars=1, num_tasks=num_tasks,
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end_callback=end_callback, cancel_callback=cancel_callback)
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def doublestarmap(self, func: CoroutineFunc, kwargs_iter: Iterable[KwArgsT], num_tasks: int = 1,
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final_callback: FinalCallbackT = None, cancel_callback: CancelCallbackT = None) -> None:
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self._map(func, kwargs_iter, arg_stars=2, num_tasks=num_tasks,
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final_callback=final_callback, cancel_callback=cancel_callback)
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async def doublestarmap(self, func: CoroutineFunc, kwargs_iter: Iterable[KwArgsT], num_tasks: int = 1,
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end_callback: EndCallbackT = None, cancel_callback: CancelCallbackT = None) -> None:
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await self._map(func, kwargs_iter, arg_stars=2, num_tasks=num_tasks,
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end_callback=end_callback, cancel_callback=cancel_callback)
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class SimpleTaskPool(BaseTaskPool):
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def __init__(self, func: CoroutineFunc, args: ArgsT = (), kwargs: KwArgsT = None,
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final_callback: FinalCallbackT = None, cancel_callback: CancelCallbackT = None,
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end_callback: EndCallbackT = None, cancel_callback: CancelCallbackT = None,
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name: str = None) -> None:
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self._func: CoroutineFunc = func
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self._args: ArgsT = args
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self._kwargs: KwArgsT = kwargs if kwargs is not None else {}
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self._final_callback: FinalCallbackT = final_callback
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self._end_callback: EndCallbackT = end_callback
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self._cancel_callback: CancelCallbackT = cancel_callback
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super().__init__(name=name)
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@ -263,12 +267,12 @@ class SimpleTaskPool(BaseTaskPool):
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def size(self) -> int:
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return self.num_running
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def _start_one(self) -> int:
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return self._start_task(self._func(*self._args, **self._kwargs),
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final_callback=self._final_callback, cancel_callback=self._cancel_callback)
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async def _start_one(self) -> int:
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return await self._start_task(self._func(*self._args, **self._kwargs),
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end_callback=self._end_callback, cancel_callback=self._cancel_callback)
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def start(self, num: int = 1) -> List[int]:
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return [self._start_one() for _ in range(num)]
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async def start(self, num: int = 1) -> List[int]:
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return [await self._start_one() for _ in range(num)]
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def stop(self, num: int = 1) -> List[int]:
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num = min(num, self.size)
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@ -45,11 +45,11 @@ class ControlServer(ABC): # TODO: Implement interface for normal TaskPool insta
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self._server_kwargs = server_kwargs
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self._server: Optional[AbstractServer] = None
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def _start_tasks(self, writer: StreamWriter, num: int = None) -> None:
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async def _start_tasks(self, writer: StreamWriter, num: int = None) -> None:
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if num is None:
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num = 1
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log.debug("%s requests starting %s %s", self.client_class.__name__, num, tasks_str(num))
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writer.write(str(self._pool.start(num)).encode())
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writer.write(str(await self._pool.start(num)).encode())
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def _stop_tasks(self, writer: StreamWriter, num: int = None) -> None:
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if num is None:
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@ -78,7 +78,7 @@ class ControlServer(ABC): # TODO: Implement interface for normal TaskPool insta
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break
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cmd, arg = get_cmd_arg(msg)
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if cmd == constants.CMD_START:
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self._start_tasks(writer, arg)
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await self._start_tasks(writer, arg)
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elif cmd == constants.CMD_STOP:
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self._stop_tasks(writer, arg)
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elif cmd == constants.CMD_STOP_ALL:
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@ -5,7 +5,7 @@ from typing import Any, Awaitable, Callable, Iterable, Mapping, Tuple, Union
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ArgsT = Iterable[Any]
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KwArgsT = Mapping[str, Any]
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CoroutineFunc = Callable[[...], Awaitable[Any]]
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FinalCallbackT = Callable
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EndCallbackT = Callable
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CancelCallbackT = Callable
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ClientConnT = Union[Tuple[StreamReader, StreamWriter], Tuple[None, None]]
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@ -1,6 +1,6 @@
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import asyncio
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from unittest import TestCase
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from unittest.mock import MagicMock, PropertyMock, patch, call
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from unittest.mock import MagicMock, PropertyMock, patch
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from asyncio_taskpool import pool
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@ -14,10 +14,10 @@ class BaseTaskPoolTestCase(TestCase):
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# These three methods are called during initialization, so we mock them by default during setup
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self._add_pool_patcher = patch.object(pool.BaseTaskPool, '_add_pool')
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self._check_more_allowed_patcher = patch.object(pool.BaseTaskPool, '_check_more_allowed')
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self.pool_size_patcher = patch.object(pool.BaseTaskPool, 'pool_size', new_callable=PropertyMock)
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self.__str___patcher = patch.object(pool.BaseTaskPool, '__str__')
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self.mock__add_pool = self._add_pool_patcher.start()
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self.mock__check_more_allowed = self._check_more_allowed_patcher.start()
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self.mock_pool_size = self.pool_size_patcher.start()
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self.mock___str__ = self.__str___patcher.start()
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self.mock__add_pool.return_value = self.mock_idx = 123
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self.mock___str__.return_value = self.mock_str = 'foobar'
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@ -29,7 +29,7 @@ class BaseTaskPoolTestCase(TestCase):
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def tearDown(self) -> None:
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setattr(pool.TaskPool, '_pools', self._pools)
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self._add_pool_patcher.stop()
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self._check_more_allowed_patcher.stop()
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self.pool_size_patcher.stop()
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self.__str___patcher.stop()
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def test__add_pool(self):
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@ -40,7 +40,7 @@ class BaseTaskPoolTestCase(TestCase):
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self.assertListEqual([self.task_pool], getattr(pool.TaskPool, '_pools'))
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def test_init(self):
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self.assertEqual(self.test_pool_size, self.task_pool.pool_size)
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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.assertEqual(0, self.task_pool._counter)
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self.assertDictEqual(EMPTY_DICT, self.task_pool._running)
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@ -51,9 +51,8 @@ class BaseTaskPoolTestCase(TestCase):
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self.assertEqual(self.test_pool_name, self.task_pool._name)
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self.assertIsInstance(self.task_pool._all_tasks_known_flag, asyncio.locks.Event)
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self.assertTrue(self.task_pool._all_tasks_known_flag.is_set())
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self.assertIsInstance(self.task_pool._more_allowed_flag, asyncio.locks.Event)
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self.mock__add_pool.assert_called_once_with(self.task_pool)
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self.mock__check_more_allowed.assert_called_once_with()
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self.mock_pool_size.assert_called_once_with(self.test_pool_size)
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self.mock___str__.assert_called_once_with()
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def test___str__(self):
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@ -64,6 +63,17 @@ class BaseTaskPoolTestCase(TestCase):
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expected_str = f'{pool.BaseTaskPool.__name__}-{self.task_pool._idx}'
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self.assertEqual(expected_str, str(self.task_pool))
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def test_pool_size(self):
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self.pool_size_patcher.stop()
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self.task_pool._pool_size = self.test_pool_size
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self.assertEqual(self.test_pool_size, self.task_pool.pool_size)
|
||||
|
||||
with self.assertRaises(ValueError):
|
||||
self.task_pool.pool_size = -1
|
||||
|
||||
self.task_pool.pool_size = new_size = 69
|
||||
self.assertEqual(new_size, self.task_pool._pool_size)
|
||||
|
||||
def test_is_open(self):
|
||||
self.task_pool._open = foo = 'foo'
|
||||
self.assertEqual(foo, self.task_pool.is_open)
|
||||
@ -91,48 +101,7 @@ class BaseTaskPoolTestCase(TestCase):
|
||||
mock_num_ended.assert_called_once_with()
|
||||
|
||||
def test_is_full(self):
|
||||
self.assertEqual(not self.task_pool._more_allowed_flag.is_set(), self.task_pool.is_full)
|
||||
|
||||
@patch.object(pool.BaseTaskPool, 'num_running', new_callable=PropertyMock)
|
||||
@patch.object(pool.BaseTaskPool, 'is_full', new_callable=PropertyMock)
|
||||
def test__check_more_allowed(self, mock_is_full: MagicMock, mock_num_running: MagicMock):
|
||||
def reset_mocks():
|
||||
mock_is_full.reset_mock()
|
||||
mock_num_running.reset_mock()
|
||||
self._check_more_allowed_patcher.stop()
|
||||
|
||||
# Just reaching limit, we expect flag to become unset:
|
||||
mock_is_full.return_value = False
|
||||
mock_num_running.return_value = 420
|
||||
self.task_pool._more_allowed_flag.clear()
|
||||
self.task_pool._check_more_allowed()
|
||||
self.assertFalse(self.task_pool._more_allowed_flag.is_set())
|
||||
mock_is_full.assert_has_calls([call(), call()])
|
||||
mock_num_running.assert_called_once_with()
|
||||
reset_mocks()
|
||||
|
||||
# Already at limit, we expect nothing to change:
|
||||
mock_is_full.return_value = True
|
||||
self.task_pool._check_more_allowed()
|
||||
self.assertFalse(self.task_pool._more_allowed_flag.is_set())
|
||||
mock_is_full.assert_has_calls([call(), call()])
|
||||
mock_num_running.assert_called_once_with()
|
||||
reset_mocks()
|
||||
|
||||
# Just finished a task, we expect flag to become set:
|
||||
mock_num_running.return_value = 419
|
||||
self.task_pool._check_more_allowed()
|
||||
self.assertTrue(self.task_pool._more_allowed_flag.is_set())
|
||||
mock_is_full.assert_called_once_with()
|
||||
mock_num_running.assert_called_once_with()
|
||||
reset_mocks()
|
||||
|
||||
# In this state we expect the flag to remain unchanged change:
|
||||
mock_is_full.return_value = False
|
||||
self.task_pool._check_more_allowed()
|
||||
self.assertTrue(self.task_pool._more_allowed_flag.is_set())
|
||||
mock_is_full.assert_has_calls([call(), call()])
|
||||
mock_num_running.assert_called_once_with()
|
||||
self.assertEqual(self.task_pool._enough_room.locked(), self.task_pool.is_full)
|
||||
|
||||
def test__task_name(self):
|
||||
i = 123
|
||||
|
||||
@ -33,9 +33,9 @@ async def work(n: int) -> None:
|
||||
|
||||
async def main() -> None:
|
||||
pool = SimpleTaskPool(work, (5,)) # initializes the pool; no work is being done yet
|
||||
pool.start(3) # launches work tasks 0, 1, and 2
|
||||
await pool.start(3) # launches work tasks 0, 1, and 2
|
||||
await asyncio.sleep(1.5) # lets the tasks work for a bit
|
||||
pool.start() # launches work task 3
|
||||
await pool.start() # launches work task 3
|
||||
await asyncio.sleep(1.5) # lets the tasks work for a bit
|
||||
pool.stop(2) # cancels tasks 3 and 2
|
||||
pool.close() # required for the last line
|
||||
|
||||
@ -44,7 +44,7 @@ async def main() -> None:
|
||||
for item in range(100):
|
||||
q.put_nowait(item)
|
||||
pool = SimpleTaskPool(worker, (q,)) # initializes the pool
|
||||
pool.start(3) # launches three worker tasks
|
||||
await pool.start(3) # launches three worker tasks
|
||||
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()
|
||||
|
||||
Loading…
Reference in New Issue
Block a user