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Edit File : timeouts.py \| Size : 5.92 KB
import enum from types import TracebackType from typing import final, Optional, Type from . import events from . import exceptions from . import tasks __all__ = ( "Timeout", "timeout", "timeout_at", ) class _State(enum.Enum): CREATED = "created" ENTERED = "active" EXPIRING = "expiring" EXPIRED = "expired" EXITED = "finished" @final class Timeout: """Asynchronous context manager for cancelling overdue coroutines. Use `timeout()` or `timeout_at()` rather than instantiating this class directly. """ def __init__(self, when: Optional[float]) -> None: """Schedule a timeout that will trigger at a given loop time. - If `when` is `None`, the timeout will never trigger. - If `when < loop.time()`, the timeout will trigger on the next iteration of the event loop. """ self._state = _State.CREATED self._timeout_handler: Optional[events.TimerHandle] = None self._task: Optional[tasks.Task] = None self._when = when def when(self) -> Optional[float]: """Return the current deadline.""" return self._when def reschedule(self, when: Optional[float]) -> None: """Reschedule the timeout.""" if self._state is not _State.ENTERED: if self._state is _State.CREATED: raise RuntimeError("Timeout has not been entered") raise RuntimeError( f"Cannot change state of {self._state.value} Timeout", ) self._when = when if self._timeout_handler is not None: self._timeout_handler.cancel() if when is None: self._timeout_handler = None else: loop = events.get_running_loop() if when <= loop.time(): self._timeout_handler = loop.call_soon(self._on_timeout) else: self._timeout_handler = loop.call_at(when, self._on_timeout) def expired(self) -> bool: """Is timeout expired during execution?""" return self._state in (_State.EXPIRING, _State.EXPIRED) def __repr__(self) -> str: info = [''] if self._state is _State.ENTERED: when = round(self._when, 3) if self._when is not None else None info.append(f"when={when}") info_str = ' '.join(info) return f"<Timeout [{self._state.value}]{info_str}>" async def __aenter__(self) -> "Timeout": if self._state is not _State.CREATED: raise RuntimeError("Timeout has already been entered") task = tasks.current_task() if task is None: raise RuntimeError("Timeout should be used inside a task") self._state = _State.ENTERED self._task = task self._cancelling = self._task.cancelling() self.reschedule(self._when) return self async def __aexit__( self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType], ) -> Optional[bool]: assert self._state in (_State.ENTERED, _State.EXPIRING) if self._timeout_handler is not None: self._timeout_handler.cancel() self._timeout_handler = None if self._state is _State.EXPIRING: self._state = _State.EXPIRED if self._task.uncancel() <= self._cancelling and exc_type is not None: # Since there are no new cancel requests, we're # handling this. if issubclass(exc_type, exceptions.CancelledError): raise TimeoutError from exc_val elif exc_val is not None: self._insert_timeout_error(exc_val) if isinstance(exc_val, ExceptionGroup): for exc in exc_val.exceptions: self._insert_timeout_error(exc) elif self._state is _State.ENTERED: self._state = _State.EXITED return None def _on_timeout(self) -> None: assert self._state is _State.ENTERED self._task.cancel() self._state = _State.EXPIRING # drop the reference early self._timeout_handler = None @staticmethod def _insert_timeout_error(exc_val: BaseException) -> None: while exc_val.__context__ is not None: if isinstance(exc_val.__context__, exceptions.CancelledError): te = TimeoutError() te.__context__ = te.__cause__ = exc_val.__context__ exc_val.__context__ = te break exc_val = exc_val.__context__ def timeout(delay: Optional[float]) -> Timeout: """Timeout async context manager. Useful in cases when you want to apply timeout logic around block of code or in cases when asyncio.wait_for is not suitable. For example: >>> async with asyncio.timeout(10): # 10 seconds timeout ... await long_running_task() delay - value in seconds or None to disable timeout logic long_running_task() is interrupted by raising asyncio.CancelledError, the top-most affected timeout() context manager converts CancelledError into TimeoutError. """ loop = events.get_running_loop() return Timeout(loop.time() + delay if delay is not None else None) def timeout_at(when: Optional[float]) -> Timeout: """Schedule the timeout at absolute time. Like timeout() but argument gives absolute time in the same clock system as loop.time(). Please note: it is not POSIX time but a time with undefined starting base, e.g. the time of the system power on. >>> async with asyncio.timeout_at(loop.time() + 10): ... await long_running_task() when - a deadline when timeout occurs or None to disable timeout logic long_running_task() is interrupted by raising asyncio.CancelledError, the top-most affected timeout() context manager converts CancelledError into TimeoutError. """ return Timeout(when) Back

Edit File : timeouts.py | Size : 5.92 KB

import enum

from types import TracebackType
from typing import final, Optional, Type

from . import events
from . import exceptions
from . import tasks

__all__ = (
    "Timeout",
    "timeout",
    "timeout_at",
)

class _State(enum.Enum):
    CREATED = "created"
    ENTERED = "active"
    EXPIRING = "expiring"
    EXPIRED = "expired"
    EXITED = "finished"

@final
class Timeout:
    """Asynchronous context manager for cancelling overdue coroutines.

Use `timeout()` or `timeout_at()` rather than instantiating this class directly.
    """

def __init__(self, when: Optional[float]) -> None:
        """Schedule a timeout that will trigger at a given loop time.

- If `when` is `None`, the timeout will never trigger.
        - If `when < loop.time()`, the timeout will trigger on the next
          iteration of the event loop.
        """
        self._state = _State.CREATED

self._timeout_handler: Optional[events.TimerHandle] = None
        self._task: Optional[tasks.Task] = None
        self._when = when

def when(self) -> Optional[float]:
        """Return the current deadline."""
        return self._when

def reschedule(self, when: Optional[float]) -> None:
        """Reschedule the timeout."""
        if self._state is not _State.ENTERED:
            if self._state is _State.CREATED:
                raise RuntimeError("Timeout has not been entered")
            raise RuntimeError(
                f"Cannot change state of {self._state.value} Timeout",
            )

self._when = when

if self._timeout_handler is not None:
            self._timeout_handler.cancel()

if when is None:
            self._timeout_handler = None
        else:
            loop = events.get_running_loop()
            if when <= loop.time():
                self._timeout_handler = loop.call_soon(self._on_timeout)
            else:
                self._timeout_handler = loop.call_at(when, self._on_timeout)

def expired(self) -> bool:
        """Is timeout expired during execution?"""
        return self._state in (_State.EXPIRING, _State.EXPIRED)

def __repr__(self) -> str:
        info = ['']
        if self._state is _State.ENTERED:
            when = round(self._when, 3) if self._when is not None else None
            info.append(f"when={when}")
        info_str = ' '.join(info)
        return f"<Timeout [{self._state.value}]{info_str}>"

async def __aenter__(self) -> "Timeout":
        if self._state is not _State.CREATED:
            raise RuntimeError("Timeout has already been entered")
        task = tasks.current_task()
        if task is None:
            raise RuntimeError("Timeout should be used inside a task")
        self._state = _State.ENTERED
        self._task = task
        self._cancelling = self._task.cancelling()
        self.reschedule(self._when)
        return self

async def __aexit__(
        self,
        exc_type: Optional[Type[BaseException]],
        exc_val: Optional[BaseException],
        exc_tb: Optional[TracebackType],
    ) -> Optional[bool]:
        assert self._state in (_State.ENTERED, _State.EXPIRING)

if self._timeout_handler is not None:
            self._timeout_handler.cancel()
            self._timeout_handler = None

if self._state is _State.EXPIRING:
            self._state = _State.EXPIRED

if self._task.uncancel() <= self._cancelling and exc_type is not None:
                # Since there are no new cancel requests, we're
                # handling this.
                if issubclass(exc_type, exceptions.CancelledError):
                    raise TimeoutError from exc_val
                elif exc_val is not None:
                    self._insert_timeout_error(exc_val)
                    if isinstance(exc_val, ExceptionGroup):
                        for exc in exc_val.exceptions:
                            self._insert_timeout_error(exc)
        elif self._state is _State.ENTERED:
            self._state = _State.EXITED

return None

def _on_timeout(self) -> None:
        assert self._state is _State.ENTERED
        self._task.cancel()
        self._state = _State.EXPIRING
        # drop the reference early
        self._timeout_handler = None

@staticmethod
    def _insert_timeout_error(exc_val: BaseException) -> None:
        while exc_val.__context__ is not None:
            if isinstance(exc_val.__context__, exceptions.CancelledError):
                te = TimeoutError()
                te.__context__ = te.__cause__ = exc_val.__context__
                exc_val.__context__ = te
                break
            exc_val = exc_val.__context__

def timeout(delay: Optional[float]) -> Timeout:
    """Timeout async context manager.

Useful in cases when you want to apply timeout logic around block
    of code or in cases when asyncio.wait_for is not suitable. For example:

>>> async with asyncio.timeout(10):  # 10 seconds timeout
    ...     await long_running_task()

delay - value in seconds or None to disable timeout logic

long_running_task() is interrupted by raising asyncio.CancelledError,
    the top-most affected timeout() context manager converts CancelledError
    into TimeoutError.
    """
    loop = events.get_running_loop()
    return Timeout(loop.time() + delay if delay is not None else None)

def timeout_at(when: Optional[float]) -> Timeout:
    """Schedule the timeout at absolute time.

Like timeout() but argument gives absolute time in the same clock system
    as loop.time().

Please note: it is not POSIX time but a time with
    undefined starting base, e.g. the time of the system power on.

>>> async with asyncio.timeout_at(loop.time() + 10):
    ...     await long_running_task()

when - a deadline when timeout occurs or None to disable timeout logic

long_running_task() is interrupted by raising asyncio.CancelledError,
    the top-most affected timeout() context manager converts CancelledError
    into TimeoutError.
    """
    return Timeout(when)

Back