update to python fastpi
This commit is contained in:
Iliyan Angelov
500
Backend/venv/lib/python3.12/site-packages/anyio/from_thread.py
Normal file
500
Backend/venv/lib/python3.12/site-packages/anyio/from_thread.py
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@@ -0,0 +1,500 @@
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from __future__ import annotations
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import threading
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from asyncio import iscoroutine
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from concurrent.futures import FIRST_COMPLETED, Future, ThreadPoolExecutor, wait
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from contextlib import AbstractContextManager, contextmanager
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from types import TracebackType
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from typing import (
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Any,
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AsyncContextManager,
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Awaitable,
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Callable,
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ContextManager,
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Generator,
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Generic,
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Iterable,
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TypeVar,
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cast,
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overload,
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)
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from warnings import warn
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from ._core import _eventloop
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from ._core._eventloop import get_asynclib, get_cancelled_exc_class, threadlocals
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from ._core._synchronization import Event
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from ._core._tasks import CancelScope, create_task_group
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from .abc._tasks import TaskStatus
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T_Retval = TypeVar("T_Retval")
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T_co = TypeVar("T_co")
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def run(func: Callable[..., Awaitable[T_Retval]], *args: object) -> T_Retval:
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"""
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Call a coroutine function from a worker thread.
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:param func: a coroutine function
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:param args: positional arguments for the callable
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:return: the return value of the coroutine function
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"""
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try:
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asynclib = threadlocals.current_async_module
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except AttributeError:
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raise RuntimeError("This function can only be run from an AnyIO worker thread")
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return asynclib.run_async_from_thread(func, *args)
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def run_async_from_thread(
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func: Callable[..., Awaitable[T_Retval]], *args: object
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) -> T_Retval:
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warn(
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"run_async_from_thread() has been deprecated, use anyio.from_thread.run() instead",
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DeprecationWarning,
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)
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return run(func, *args)
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def run_sync(func: Callable[..., T_Retval], *args: object) -> T_Retval:
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"""
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Call a function in the event loop thread from a worker thread.
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:param func: a callable
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:param args: positional arguments for the callable
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:return: the return value of the callable
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"""
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try:
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asynclib = threadlocals.current_async_module
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except AttributeError:
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raise RuntimeError("This function can only be run from an AnyIO worker thread")
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return asynclib.run_sync_from_thread(func, *args)
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def run_sync_from_thread(func: Callable[..., T_Retval], *args: object) -> T_Retval:
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warn(
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"run_sync_from_thread() has been deprecated, use anyio.from_thread.run_sync() instead",
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DeprecationWarning,
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)
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return run_sync(func, *args)
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class _BlockingAsyncContextManager(Generic[T_co], AbstractContextManager):
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_enter_future: Future
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_exit_future: Future
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_exit_event: Event
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_exit_exc_info: tuple[
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type[BaseException] | None, BaseException | None, TracebackType | None
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] = (None, None, None)
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def __init__(self, async_cm: AsyncContextManager[T_co], portal: BlockingPortal):
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self._async_cm = async_cm
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self._portal = portal
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async def run_async_cm(self) -> bool | None:
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try:
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self._exit_event = Event()
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value = await self._async_cm.__aenter__()
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except BaseException as exc:
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self._enter_future.set_exception(exc)
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raise
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else:
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self._enter_future.set_result(value)
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try:
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# Wait for the sync context manager to exit.
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# This next statement can raise `get_cancelled_exc_class()` if
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# something went wrong in a task group in this async context
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# manager.
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await self._exit_event.wait()
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finally:
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# In case of cancellation, it could be that we end up here before
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# `_BlockingAsyncContextManager.__exit__` is called, and an
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# `_exit_exc_info` has been set.
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result = await self._async_cm.__aexit__(*self._exit_exc_info)
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return result
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def __enter__(self) -> T_co:
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self._enter_future = Future()
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self._exit_future = self._portal.start_task_soon(self.run_async_cm)
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cm = self._enter_future.result()
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return cast(T_co, cm)
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def __exit__(
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self,
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__exc_type: type[BaseException] | None,
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__exc_value: BaseException | None,
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__traceback: TracebackType | None,
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) -> bool | None:
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self._exit_exc_info = __exc_type, __exc_value, __traceback
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self._portal.call(self._exit_event.set)
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return self._exit_future.result()
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class _BlockingPortalTaskStatus(TaskStatus):
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def __init__(self, future: Future):
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self._future = future
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def started(self, value: object = None) -> None:
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self._future.set_result(value)
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class BlockingPortal:
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"""An object that lets external threads run code in an asynchronous event loop."""
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def __new__(cls) -> BlockingPortal:
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return get_asynclib().BlockingPortal()
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def __init__(self) -> None:
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self._event_loop_thread_id: int | None = threading.get_ident()
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self._stop_event = Event()
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self._task_group = create_task_group()
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self._cancelled_exc_class = get_cancelled_exc_class()
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async def __aenter__(self) -> BlockingPortal:
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await self._task_group.__aenter__()
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return self
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async def __aexit__(
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self,
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exc_type: type[BaseException] | None,
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exc_val: BaseException | None,
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exc_tb: TracebackType | None,
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) -> bool | None:
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await self.stop()
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return await self._task_group.__aexit__(exc_type, exc_val, exc_tb)
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def _check_running(self) -> None:
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if self._event_loop_thread_id is None:
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raise RuntimeError("This portal is not running")
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if self._event_loop_thread_id == threading.get_ident():
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raise RuntimeError(
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"This method cannot be called from the event loop thread"
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)
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async def sleep_until_stopped(self) -> None:
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"""Sleep until :meth:`stop` is called."""
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await self._stop_event.wait()
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async def stop(self, cancel_remaining: bool = False) -> None:
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"""
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Signal the portal to shut down.
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This marks the portal as no longer accepting new calls and exits from
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:meth:`sleep_until_stopped`.
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:param cancel_remaining: ``True`` to cancel all the remaining tasks, ``False`` to let them
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finish before returning
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"""
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self._event_loop_thread_id = None
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self._stop_event.set()
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if cancel_remaining:
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self._task_group.cancel_scope.cancel()
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async def _call_func(
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self, func: Callable, args: tuple, kwargs: dict[str, Any], future: Future
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) -> None:
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def callback(f: Future) -> None:
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if f.cancelled() and self._event_loop_thread_id not in (
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None,
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threading.get_ident(),
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):
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self.call(scope.cancel)
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try:
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retval = func(*args, **kwargs)
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if iscoroutine(retval):
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with CancelScope() as scope:
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if future.cancelled():
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scope.cancel()
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else:
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future.add_done_callback(callback)
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retval = await retval
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except self._cancelled_exc_class:
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future.cancel()
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except BaseException as exc:
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if not future.cancelled():
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future.set_exception(exc)
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# Let base exceptions fall through
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if not isinstance(exc, Exception):
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raise
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else:
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if not future.cancelled():
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future.set_result(retval)
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finally:
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scope = None # type: ignore[assignment]
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def _spawn_task_from_thread(
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self,
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func: Callable,
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args: tuple,
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kwargs: dict[str, Any],
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name: object,
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future: Future,
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) -> None:
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"""
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Spawn a new task using the given callable.
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Implementors must ensure that the future is resolved when the task finishes.
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:param func: a callable
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:param args: positional arguments to be passed to the callable
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:param kwargs: keyword arguments to be passed to the callable
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:param name: name of the task (will be coerced to a string if not ``None``)
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:param future: a future that will resolve to the return value of the callable, or the
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exception raised during its execution
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"""
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raise NotImplementedError
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@overload
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def call(self, func: Callable[..., Awaitable[T_Retval]], *args: object) -> T_Retval:
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...
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@overload
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def call(self, func: Callable[..., T_Retval], *args: object) -> T_Retval:
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...
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def call(
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self, func: Callable[..., Awaitable[T_Retval] | T_Retval], *args: object
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) -> T_Retval:
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"""
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Call the given function in the event loop thread.
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If the callable returns a coroutine object, it is awaited on.
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:param func: any callable
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:raises RuntimeError: if the portal is not running or if this method is called from within
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the event loop thread
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"""
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return cast(T_Retval, self.start_task_soon(func, *args).result())
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@overload
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def spawn_task(
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self,
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func: Callable[..., Awaitable[T_Retval]],
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*args: object,
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name: object = None,
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) -> Future[T_Retval]:
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...
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@overload
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def spawn_task(
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self, func: Callable[..., T_Retval], *args: object, name: object = None
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) -> Future[T_Retval]:
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...
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def spawn_task(
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self,
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func: Callable[..., Awaitable[T_Retval] | T_Retval],
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*args: object,
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name: object = None,
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) -> Future[T_Retval]:
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"""
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Start a task in the portal's task group.
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:param func: the target coroutine function
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:param args: positional arguments passed to ``func``
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:param name: name of the task (will be coerced to a string if not ``None``)
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:return: a future that resolves with the return value of the callable if the task completes
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successfully, or with the exception raised in the task
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:raises RuntimeError: if the portal is not running or if this method is called from within
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the event loop thread
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.. versionadded:: 2.1
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.. deprecated:: 3.0
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Use :meth:`start_task_soon` instead. If your code needs AnyIO 2 compatibility, you
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can keep using this until AnyIO 4.
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"""
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warn(
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"spawn_task() is deprecated -- use start_task_soon() instead",
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DeprecationWarning,
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)
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return self.start_task_soon(func, *args, name=name) # type: ignore[arg-type]
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@overload
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def start_task_soon(
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self,
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func: Callable[..., Awaitable[T_Retval]],
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*args: object,
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name: object = None,
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) -> Future[T_Retval]:
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...
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@overload
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def start_task_soon(
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self, func: Callable[..., T_Retval], *args: object, name: object = None
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) -> Future[T_Retval]:
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...
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def start_task_soon(
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self,
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func: Callable[..., Awaitable[T_Retval] | T_Retval],
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*args: object,
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name: object = None,
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) -> Future[T_Retval]:
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"""
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Start a task in the portal's task group.
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The task will be run inside a cancel scope which can be cancelled by cancelling the
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returned future.
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:param func: the target function
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:param args: positional arguments passed to ``func``
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:param name: name of the task (will be coerced to a string if not ``None``)
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:return: a future that resolves with the return value of the callable if the
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task completes successfully, or with the exception raised in the task
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:raises RuntimeError: if the portal is not running or if this method is called
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from within the event loop thread
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:rtype: concurrent.futures.Future[T_Retval]
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.. versionadded:: 3.0
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"""
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self._check_running()
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f: Future = Future()
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self._spawn_task_from_thread(func, args, {}, name, f)
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return f
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def start_task(
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self, func: Callable[..., Awaitable[Any]], *args: object, name: object = None
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) -> tuple[Future[Any], Any]:
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"""
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Start a task in the portal's task group and wait until it signals for readiness.
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This method works the same way as :meth:`.abc.TaskGroup.start`.
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:param func: the target function
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:param args: positional arguments passed to ``func``
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:param name: name of the task (will be coerced to a string if not ``None``)
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:return: a tuple of (future, task_status_value) where the ``task_status_value``
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is the value passed to ``task_status.started()`` from within the target
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function
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:rtype: tuple[concurrent.futures.Future[Any], Any]
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.. versionadded:: 3.0
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"""
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def task_done(future: Future) -> None:
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if not task_status_future.done():
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if future.cancelled():
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task_status_future.cancel()
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elif future.exception():
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task_status_future.set_exception(future.exception())
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else:
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exc = RuntimeError(
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"Task exited without calling task_status.started()"
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)
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task_status_future.set_exception(exc)
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self._check_running()
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task_status_future: Future = Future()
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task_status = _BlockingPortalTaskStatus(task_status_future)
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f: Future = Future()
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f.add_done_callback(task_done)
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self._spawn_task_from_thread(func, args, {"task_status": task_status}, name, f)
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return f, task_status_future.result()
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def wrap_async_context_manager(
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self, cm: AsyncContextManager[T_co]
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) -> ContextManager[T_co]:
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"""
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Wrap an async context manager as a synchronous context manager via this portal.
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Spawns a task that will call both ``__aenter__()`` and ``__aexit__()``, stopping in the
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middle until the synchronous context manager exits.
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:param cm: an asynchronous context manager
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:return: a synchronous context manager
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.. versionadded:: 2.1
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"""
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return _BlockingAsyncContextManager(cm, self)
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def create_blocking_portal() -> BlockingPortal:
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"""
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Create a portal for running functions in the event loop thread from external threads.
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Use this function in asynchronous code when you need to allow external threads access to the
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event loop where your asynchronous code is currently running.
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.. deprecated:: 3.0
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Use :class:`.BlockingPortal` directly.
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"""
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warn(
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"create_blocking_portal() has been deprecated -- use anyio.from_thread.BlockingPortal() "
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"directly",
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DeprecationWarning,
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)
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return BlockingPortal()
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@contextmanager
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def start_blocking_portal(
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backend: str = "asyncio", backend_options: dict[str, Any] | None = None
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) -> Generator[BlockingPortal, Any, None]:
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"""
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Start a new event loop in a new thread and run a blocking portal in its main task.
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The parameters are the same as for :func:`~anyio.run`.
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:param backend: name of the backend
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:param backend_options: backend options
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:return: a context manager that yields a blocking portal
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.. versionchanged:: 3.0
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Usage as a context manager is now required.
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"""
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async def run_portal() -> None:
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async with BlockingPortal() as portal_:
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if future.set_running_or_notify_cancel():
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future.set_result(portal_)
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await portal_.sleep_until_stopped()
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future: Future[BlockingPortal] = Future()
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with ThreadPoolExecutor(1) as executor:
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run_future = executor.submit(
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_eventloop.run,
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run_portal, # type: ignore[arg-type]
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backend=backend,
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backend_options=backend_options,
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)
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try:
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wait(
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cast(Iterable[Future], [run_future, future]),
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return_when=FIRST_COMPLETED,
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||||
)
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||||
except BaseException:
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future.cancel()
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run_future.cancel()
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raise
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||||
|
||||
if future.done():
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||||
portal = future.result()
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cancel_remaining_tasks = False
|
||||
try:
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yield portal
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||||
except BaseException:
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||||
cancel_remaining_tasks = True
|
||||
raise
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||||
finally:
|
||||
try:
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portal.call(portal.stop, cancel_remaining_tasks)
|
||||
except RuntimeError:
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||||
pass
|
||||
|
||||
run_future.result()
|
||||
Reference in New Issue
Block a user