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Added support for wait_readable() and wait_writable() on ProactorEven…
…tLoop (#831)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| from __future__ import annotations | ||
|
|
||
| import asyncio | ||
| import socket | ||
| import threading | ||
| from collections.abc import Callable | ||
| from selectors import EVENT_READ, EVENT_WRITE, DefaultSelector | ||
| from typing import TYPE_CHECKING, Any | ||
|
|
||
| if TYPE_CHECKING: | ||
| from _typeshed import FileDescriptorLike | ||
|
|
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| _selector_lock = threading.Lock() | ||
| _selector: Selector | None = None | ||
|
|
||
|
|
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| class Selector: | ||
| def __init__(self) -> None: | ||
| self._thread = threading.Thread(target=self.run, name="AnyIO socket selector") | ||
| self._selector = DefaultSelector() | ||
| self._send, self._receive = socket.socketpair() | ||
| self._send.setblocking(False) | ||
| self._receive.setblocking(False) | ||
| self._selector.register(self._receive, EVENT_READ) | ||
| self._closed = False | ||
|
|
||
| def start(self) -> None: | ||
| self._thread.start() | ||
| threading._register_atexit(self._stop) # type: ignore[attr-defined] | ||
|
|
||
| def _stop(self) -> None: | ||
| global _selector | ||
| self._closed = True | ||
| self._notify_self() | ||
| self._send.close() | ||
| self._thread.join() | ||
| self._selector.unregister(self._receive) | ||
| self._receive.close() | ||
| self._selector.close() | ||
| _selector = None | ||
| assert ( | ||
| not self._selector.get_map() | ||
| ), "selector still has registered file descriptors after shutdown" | ||
|
|
||
| def _notify_self(self) -> None: | ||
| try: | ||
| self._send.send(b"\x00") | ||
| except BlockingIOError: | ||
| pass | ||
|
|
||
| def add_reader(self, fd: FileDescriptorLike, callback: Callable[[], Any]) -> None: | ||
| loop = asyncio.get_running_loop() | ||
| try: | ||
| key = self._selector.get_key(fd) | ||
| except KeyError: | ||
| self._selector.register(fd, EVENT_READ, {EVENT_READ: (loop, callback)}) | ||
| else: | ||
| if EVENT_READ in key.data: | ||
| raise ValueError( | ||
| "this file descriptor is already registered for reading" | ||
| ) | ||
|
|
||
| key.data[EVENT_READ] = loop, callback | ||
| self._selector.modify(fd, key.events | EVENT_READ, key.data) | ||
|
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| self._notify_self() | ||
|
|
||
| def add_writer(self, fd: FileDescriptorLike, callback: Callable[[], Any]) -> None: | ||
| loop = asyncio.get_running_loop() | ||
| try: | ||
| key = self._selector.get_key(fd) | ||
| except KeyError: | ||
| self._selector.register(fd, EVENT_WRITE, {EVENT_WRITE: (loop, callback)}) | ||
| else: | ||
| if EVENT_WRITE in key.data: | ||
| raise ValueError( | ||
| "this file descriptor is already registered for writing" | ||
| ) | ||
|
|
||
| key.data[EVENT_WRITE] = loop, callback | ||
| self._selector.modify(fd, key.events | EVENT_WRITE, key.data) | ||
|
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| self._notify_self() | ||
|
|
||
| def remove_reader(self, fd: FileDescriptorLike) -> bool: | ||
| try: | ||
| key = self._selector.get_key(fd) | ||
| except KeyError: | ||
| return False | ||
|
|
||
| if new_events := key.events ^ EVENT_READ: | ||
| del key.data[EVENT_READ] | ||
| self._selector.modify(fd, new_events, key.data) | ||
| else: | ||
| self._selector.unregister(fd) | ||
|
|
||
| return True | ||
|
|
||
| def remove_writer(self, fd: FileDescriptorLike) -> bool: | ||
| try: | ||
| key = self._selector.get_key(fd) | ||
| except KeyError: | ||
| return False | ||
|
|
||
| if new_events := key.events ^ EVENT_WRITE: | ||
| del key.data[EVENT_WRITE] | ||
| self._selector.modify(fd, new_events, key.data) | ||
| else: | ||
| self._selector.unregister(fd) | ||
|
|
||
| return True | ||
|
|
||
| def run(self) -> None: | ||
| while not self._closed: | ||
| for key, events in self._selector.select(): | ||
| if key.fileobj is self._receive: | ||
| try: | ||
| while self._receive.recv(4096): | ||
| pass | ||
| except BlockingIOError: | ||
| pass | ||
|
|
||
| continue | ||
|
|
||
| if events & EVENT_READ: | ||
| loop, callback = key.data[EVENT_READ] | ||
| self.remove_reader(key.fd) | ||
| try: | ||
| loop.call_soon_threadsafe(callback) | ||
| except RuntimeError: | ||
| pass # the loop was already closed | ||
|
|
||
| if events & EVENT_WRITE: | ||
| loop, callback = key.data[EVENT_WRITE] | ||
| self.remove_writer(key.fd) | ||
| try: | ||
| loop.call_soon_threadsafe(callback) | ||
| except RuntimeError: | ||
| pass # the loop was already closed | ||
|
|
||
|
|
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| def get_selector() -> Selector: | ||
| global _selector | ||
|
|
||
| with _selector_lock: | ||
| if _selector is None: | ||
| _selector = Selector() | ||
| _selector.start() | ||
|
|
||
| return _selector |
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