Quelle base_protocol.py Sprache: Python

import asyncio
from typing import Optional, cast

from .client_exceptions import ClientConnectionResetError
from .helpers import set_exception
from .tcp_helpers import tcp_nodelay

class BaseProtocol(asyncio.Protocol):
    __slots__ = (
        "_loop",
        "_paused",
        "_drain_waiter",
        "_connection_lost",
        "_reading_paused",
        "transport",
    )

    def __init__(self, loop: asyncio.AbstractEventLoop) -> None:
        self._loop: asyncio.AbstractEventLoop = loop
        self._paused = False
        self._drain_waiter: Optional[asyncio.Future[None]] = None
        self._reading_paused = False

        self.transport: Optional[asyncio.Transport] = None

    @property
    def connected(self) -> bool:
        """Return True if the connection is open."""
        return self.transport is not None

    def pause_writing(self) -> None:
        assert not self._paused
        self._paused = True

    def resume_writing(self) -> None:
        assert self._paused
        self._paused = False

        waiter = self._drain_waiter
        if waiter is not None:
            self._drain_waiter = None
            if not waiter.done():
                waiter.set_result(None)

    def pause_reading(self) -> None:
        if not self._reading_paused and self.transport is not None:
            try:
                self.transport.pause_reading()
            except (AttributeError, NotImplementedError, RuntimeError):
                pass
            self._reading_paused = True

    def resume_reading(self) -> None:
        if self._reading_paused and self.transport is not None:
            try:
                self.transport.resume_reading()
            except (AttributeError, NotImplementedError, RuntimeError):
                pass
            self._reading_paused = False

    def connection_made(self, transport: asyncio.BaseTransport) -> None:
        tr = cast(asyncio.Transport, transport)
        tcp_nodelay(tr, True)
        self.transport = tr

    def connection_lost(self, exc: Optional[BaseException]) -> None:
        # Wake up the writer if currently paused.
        self.transport = None
        if not self._paused:
            return
        waiter = self._drain_waiter
        if waiter is None:
            return
        self._drain_waiter = None
        if waiter.done():
            return
        if exc is None:
            waiter.set_result(None)
        else:
            set_exception(
                waiter,
                ConnectionError("Connection lost"),
                exc,
            )

    async def _drain_helper(self) -> None:
        if not self.connected:
            raise ClientConnectionResetError("Connection lost")
        if not self._paused:
            return
        waiter = self._drain_waiter
        if waiter is None:
            waiter = self._loop.create_future()
            self._drain_waiter = waiter
        await asyncio.shield(waiter)

quality97%

¤ Dauer der Verarbeitung: 0.15 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.