generated from daniil-berg/boilerplate-py
huge rework; two different task pool classes now
This commit is contained in:
@ -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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