generated from daniil-berg/boilerplate-py
huge rework; two different task pool classes now
This commit is contained in:
parent
f45fef6497
commit
3eae7d803f
@ -1,2 +1,2 @@
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from .pool import TaskPool
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from .pool import TaskPool, SimpleTaskPool
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from .server import UnixControlServer
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26
src/asyncio_taskpool/exceptions.py
Normal file
26
src/asyncio_taskpool/exceptions.py
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@ -0,0 +1,26 @@
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class PoolException(Exception):
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pass
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class PoolIsClosed(PoolException):
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pass
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class TaskEnded(PoolException):
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pass
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class AlreadyCancelled(TaskEnded):
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pass
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class AlreadyFinished(TaskEnded):
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pass
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class InvalidTaskID(PoolException):
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pass
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class PoolStillOpen(PoolException):
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pass
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@ -1,36 +1,207 @@
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import logging
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from asyncio import gather
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from asyncio.tasks import Task
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from typing import Mapping, List, Iterable, Any
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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.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 .types import CoroutineFunc, FinalCallbackT, CancelCallbackT
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from .task import start_task
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from . import exceptions
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from .types import ArgsT, KwArgsT, CoroutineFunc, FinalCallbackT, CancelCallbackT
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log = logging.getLogger(__name__)
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class TaskPool:
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_pools: List['TaskPool'] = []
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class BaseTaskPool:
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_pools: List['BaseTaskPool'] = []
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@classmethod
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def _add_pool(cls, pool: 'TaskPool') -> int:
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def _add_pool(cls, pool: 'BaseTaskPool') -> int:
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cls._pools.append(pool)
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return len(cls._pools) - 1
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def __init__(self, func: CoroutineFunc, args: Iterable[Any] = (), kwargs: Mapping[str, Any] = None,
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def __init__(self, max_size: int = inf, name: str = None) -> None:
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self._max_size: int = max_size # TODO: Make use of a synchronization primitive for this to work
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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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self._cancelled: Dict[int, Task] = {}
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self._ended: Dict[int, Task] = {}
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self._all_tasks_known: Event = Event()
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self._all_tasks_known.set()
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self._idx: int = self._add_pool(self)
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self._name: str = name
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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 num_running(self) -> int:
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return len(self._running)
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@property
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def num_cancelled(self) -> int:
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return len(self._cancelled)
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@property
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def num_ended(self) -> int:
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return len(self._ended)
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@property
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def num_finished(self) -> int:
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return self.num_ended - self.num_cancelled
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def _task_name(self, task_id: int) -> str:
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return f'{self}_Task-{task_id}'
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async def _cancel_task(self, task_id: int, custom_callback: CancelCallbackT = None) -> None:
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log.debug("Cancelling %s ...", self._task_name(task_id))
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task = self._running.pop(task_id)
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assert task is not None
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self._cancelled[task_id] = task
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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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async def _end_task(self, task_id: int, custom_callback: FinalCallbackT = 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._ended[task_id] = task
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await _execute_function(custom_callback, args=(task_id, ))
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log.info("Ended %s", self._task_name(task_id))
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async def _task_wrapper(self, awaitable: Awaitable, task_id: int, final_callback: FinalCallbackT = 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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return await awaitable
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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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def _start_task(self, awaitable: Awaitable, ignore_closed: bool = False, final_callback: FinalCallbackT = None,
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cancel_callback: CancelCallbackT = None) -> int:
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if not (self._open or ignore_closed):
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raise exceptions.PoolIsClosed("Cannot start new tasks")
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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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name=self._task_name(task_id)
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)
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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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try:
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task = self._running[task_id]
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except KeyError:
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if self._cancelled.get(task_id):
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raise exceptions.AlreadyCancelled(f"{self._task_name(task_id)} has already been cancelled")
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if self._ended.get(task_id):
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raise exceptions.AlreadyFinished(f"{self._task_name(task_id)} has finished running")
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raise exceptions.InvalidTaskID(f"No task with ID {task_id} found in {self}")
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task.cancel(msg=msg)
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def cancel(self, *task_ids: int, msg: str = None) -> None:
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for task_id in task_ids:
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self._cancel_one(task_id, msg=msg)
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def cancel_all(self, msg: str = None) -> None:
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for task in self._running.values():
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task.cancel(msg=msg)
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def close(self) -> None:
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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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if self._open:
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raise exceptions.PoolStillOpen("Pool must be closed, before tasks can be gathered")
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await self._all_tasks_known.wait()
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results = await gather(*self._running.values(), *self._ended.values(), return_exceptions=return_exceptions)
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self._running = self._cancelled = self._ended = {}
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return results
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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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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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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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@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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try:
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arg = next(args_iter)
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except StopIteration:
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return
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if arg_stars == 0:
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return func(arg)
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if arg_stars == 1:
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return func(*arg)
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if arg_stars == 2:
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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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if self._all_tasks_known.is_set():
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self._all_tasks_known.clear()
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args_iter = iter(args_iter)
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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.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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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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for _ in range(num_tasks):
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reached_end = _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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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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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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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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name: str = None) -> None:
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self._func: CoroutineFunc = func
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self._args: Iterable[Any] = args
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self._kwargs: Mapping[str, Any] = kwargs if kwargs is not None else {}
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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._cancel_callback: CancelCallbackT = cancel_callback
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self._tasks: List[Task] = []
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self._cancelled: List[Task] = []
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self._idx: int = self._add_pool(self)
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self._name: str = name
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log.debug("%s initialized", repr(self))
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super().__init__(name=name)
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@property
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def func_name(self) -> str:
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@ -38,40 +209,34 @@ class TaskPool:
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@property
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def size(self) -> int:
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return len(self._tasks)
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return self.num_running
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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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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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def __repr__(self) -> str:
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return f'<{self} func={self.func_name}>'
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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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def _task_name(self, i: int) -> str:
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return f'{self.func_name}_pool_task_{i}'
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def _start_one(self) -> None:
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self._tasks.append(start_task(self._func(*self._args, **self._kwargs), self._task_name(self.size),
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final_callback=self._final_callback, cancel_callback=self._cancel_callback))
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def start(self, num: int = 1) -> None:
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for _ in range(num):
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self._start_one()
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def stop(self, num: int = 1) -> int:
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for i in range(num):
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try:
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task = self._tasks.pop()
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except IndexError:
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num = i
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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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ids = []
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for i, task_id in enumerate(reversed(self._running)):
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if i >= num:
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break
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task.cancel()
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self._cancelled.append(task)
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return num
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ids.append(task_id)
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self.cancel(*ids)
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return ids
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def stop_all(self) -> int:
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def stop_all(self) -> List[int]:
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return self.stop(self.size)
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async def close(self, return_exceptions: bool = False):
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results = await gather(*self._tasks, *self._cancelled, return_exceptions=return_exceptions)
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self._tasks = self._cancelled = []
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return results
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async def _execute_function(func: Callable, args: ArgsT = (), kwargs: KwArgsT = None) -> None:
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if kwargs is None:
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kwargs = {}
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if callable(func):
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if iscoroutinefunction(func):
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await func(*args, **kwargs)
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else:
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func(*args, **kwargs)
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@ -8,7 +8,7 @@ from pathlib import Path
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from typing import Tuple, Union, Optional
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from . import constants
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from .pool import TaskPool
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from .pool import SimpleTaskPool
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from .client import ControlClient, UnixControlClient
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@ -29,7 +29,7 @@ def get_cmd_arg(msg: str) -> Union[Tuple[str, Optional[int]], Tuple[None, None]]
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return cmd[0], None
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class ControlServer(ABC):
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class ControlServer(ABC): # TODO: Implement interface for normal TaskPool instances, not just SimpleTaskPool
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client_class = ControlClient
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@abstractmethod
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@ -40,8 +40,8 @@ class ControlServer(ABC):
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def final_callback(self) -> None:
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raise NotImplementedError
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def __init__(self, pool: TaskPool, **server_kwargs) -> None:
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self._pool: TaskPool = pool
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def __init__(self, pool: SimpleTaskPool, **server_kwargs) -> None:
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self._pool: SimpleTaskPool = pool
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self._server_kwargs = server_kwargs
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self._server: Optional[AbstractServer] = None
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@ -49,26 +49,22 @@ class ControlServer(ABC):
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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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self._pool.start(num)
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size = self._pool.size
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writer.write(f"{num} new {tasks_str(num)} started! {size} {tasks_str(size)} active now.".encode())
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writer.write(str(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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num = 1
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log.debug("%s requests stopping %s %s", self.client_class.__name__, num, tasks_str(num))
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num = self._pool.stop(num) # the requested number may be greater than the total number of running tasks
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size = self._pool.size
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writer.write(f"{num} {tasks_str(num)} stopped! {size} {tasks_str(size)} left.".encode())
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# the requested number may be greater than the total number of running tasks
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writer.write(str(self._pool.stop(num)).encode())
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def _stop_all_tasks(self, writer: StreamWriter) -> None:
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log.debug("%s requests stopping all tasks", self.client_class.__name__)
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num = self._pool.stop_all()
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writer.write(f"Remaining {num} {tasks_str(num)} stopped!".encode())
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writer.write(str(self._pool.stop_all()).encode())
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def _pool_size(self, writer: StreamWriter) -> None:
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log.debug("%s requests pool size", self.client_class.__name__)
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writer.write(f'{self._pool.size}'.encode())
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writer.write(str(self._pool.size).encode())
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def _pool_func(self, writer: StreamWriter) -> None:
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log.debug("%s requests pool function", self.client_class.__name__)
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@ -98,7 +94,7 @@ class ControlServer(ABC):
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async def _client_connected_cb(self, reader: StreamReader, writer: StreamWriter) -> None:
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log.debug("%s connected", self.client_class.__name__)
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writer.write(f"{self.__class__.__name__} for {self._pool}".encode())
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writer.write(str(self._pool).encode())
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await writer.drain()
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await self._listen(reader, writer)
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@ -120,7 +116,7 @@ class ControlServer(ABC):
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class UnixControlServer(ControlServer):
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client_class = UnixControlClient
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def __init__(self, pool: TaskPool, **server_kwargs) -> None:
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def __init__(self, pool: SimpleTaskPool, **server_kwargs) -> None:
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self._socket_path = Path(server_kwargs.pop('path'))
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super().__init__(pool, **server_kwargs)
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@ -1,30 +0,0 @@
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import logging
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from asyncio.exceptions import CancelledError
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from asyncio.tasks import Task, create_task
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from typing import Awaitable, Any
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from .types import FinalCallbackT, CancelCallbackT
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log = logging.getLogger(__name__)
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async def wrap(awaitable: Awaitable, task_name: str, final_callback: FinalCallbackT = None,
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cancel_callback: CancelCallbackT = None) -> Any:
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log.info("Started %s", task_name)
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try:
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return await awaitable
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except CancelledError:
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log.info("Cancelling %s ...", task_name)
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if callable(cancel_callback):
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cancel_callback()
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log.info("Cancelled %s", task_name)
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finally:
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if callable(final_callback):
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final_callback()
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log.info("Exiting %s", task_name)
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def start_task(awaitable: Awaitable, task_name: str, final_callback: FinalCallbackT = None,
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cancel_callback: CancelCallbackT = None) -> Task:
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return create_task(wrap(awaitable, task_name, final_callback, cancel_callback), name=task_name)
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@ -1,7 +1,9 @@
|
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from asyncio.streams import StreamReader, StreamWriter
|
||||
from typing import Tuple, Callable, Awaitable, Union, Any
|
||||
from typing import Any, Awaitable, Callable, Iterable, Mapping, Tuple, Union
|
||||
|
||||
|
||||
ArgsT = Iterable[Any]
|
||||
KwArgsT = Mapping[str, Any]
|
||||
CoroutineFunc = Callable[[...], Awaitable[Any]]
|
||||
FinalCallbackT = Callable
|
||||
CancelCallbackT = Callable
|
||||
|
||||
@ -1,8 +1,8 @@
|
||||
# Using `asyncio-taskpool`
|
||||
|
||||
## Simple example
|
||||
## Minimal example for `SimpleTaskPool`
|
||||
|
||||
The minimum required setup is a "worker" coroutine function that can do something asynchronously, a main coroutine function that sets up the `TaskPool` and starts/stops the tasks as desired, eventually awaiting them all.
|
||||
The minimum required setup is a "worker" coroutine function that can do something asynchronously, a main coroutine function that sets up the `SimpleTaskPool` and starts/stops the tasks as desired, eventually awaiting them all.
|
||||
|
||||
The following demo code enables full log output first for additional clarity. It is complete and should work as is.
|
||||
|
||||
@ -11,7 +11,7 @@ The following demo code enables full log output first for additional clarity. It
|
||||
import logging
|
||||
import asyncio
|
||||
|
||||
from asyncio_taskpool.pool import TaskPool
|
||||
from asyncio_taskpool.pool import SimpleTaskPool
|
||||
|
||||
|
||||
logging.getLogger().setLevel(logging.NOTSET)
|
||||
@ -32,13 +32,14 @@ async def work(n: int) -> None:
|
||||
|
||||
|
||||
async def main() -> None:
|
||||
pool = TaskPool(work, (5,)) # initializes the pool; no work is being done yet
|
||||
pool = SimpleTaskPool(work, (5,)) # initializes the pool; no work is being done yet
|
||||
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 asyncio.sleep(1.5) # lets the tasks work for a bit
|
||||
pool.stop(2) # cancels tasks 3 and 2
|
||||
await pool.close() # awaits all tasks, then flushes the pool
|
||||
pool.close() # required for the last line
|
||||
await pool.gather() # awaits all tasks, then flushes the pool
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
@ -46,31 +47,32 @@ if __name__ == '__main__':
|
||||
```
|
||||
|
||||
### Output
|
||||
Additional comments indicated with `<--`
|
||||
```
|
||||
Started work_pool_task_0
|
||||
Started work_pool_task_1
|
||||
Started work_pool_task_2
|
||||
SimpleTaskPool-0 initialized
|
||||
Started SimpleTaskPool-0_Task-0
|
||||
Started SimpleTaskPool-0_Task-1
|
||||
Started SimpleTaskPool-0_Task-2
|
||||
did 0
|
||||
did 0
|
||||
did 0
|
||||
Started work_pool_task_3
|
||||
Started SimpleTaskPool-0_Task-3
|
||||
did 1
|
||||
did 1
|
||||
did 1
|
||||
did 0 <-- notice that the newly created task begins counting at 0
|
||||
did 0
|
||||
SimpleTaskPool-0 is closed!
|
||||
Cancelling SimpleTaskPool-0_Task-3 ...
|
||||
Cancelled SimpleTaskPool-0_Task-3
|
||||
Ended SimpleTaskPool-0_Task-3
|
||||
Cancelling SimpleTaskPool-0_Task-2 ...
|
||||
Cancelled SimpleTaskPool-0_Task-2
|
||||
Ended SimpleTaskPool-0_Task-2
|
||||
did 2
|
||||
did 2
|
||||
did 2 <-- two taks were stopped; only tasks 0 and 1 continue "working"
|
||||
Cancelling work_pool_task_2 ...
|
||||
Cancelled work_pool_task_2
|
||||
Exiting work_pool_task_2
|
||||
Cancelling work_pool_task_3 ...
|
||||
Cancelled work_pool_task_3
|
||||
Exiting work_pool_task_3
|
||||
did 3
|
||||
did 3
|
||||
Exiting work_pool_task_0
|
||||
Exiting work_pool_task_1
|
||||
Ended SimpleTaskPool-0_Task-0
|
||||
Ended SimpleTaskPool-0_Task-1
|
||||
did 4
|
||||
did 4
|
||||
```
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
import asyncio
|
||||
import logging
|
||||
|
||||
from asyncio_taskpool import TaskPool, UnixControlServer
|
||||
from asyncio_taskpool import SimpleTaskPool, UnixControlServer
|
||||
from asyncio_taskpool.constants import PACKAGE_NAME
|
||||
|
||||
|
||||
@ -43,7 +43,7 @@ async def main() -> None:
|
||||
# We just put some integers into our queue, since all our workers actually do, is print an item and sleep for a bit.
|
||||
for item in range(100):
|
||||
q.put_nowait(item)
|
||||
pool = TaskPool(worker, (q,)) # initializes the pool
|
||||
pool = SimpleTaskPool(worker, (q,)) # initializes the pool
|
||||
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.
|
||||
@ -53,10 +53,11 @@ async def main() -> None:
|
||||
# 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()
|
||||
# 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.
|
||||
await pool.close(return_exceptions=True)
|
||||
await pool.gather(return_exceptions=True)
|
||||
await control_server_task
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user