ai-content-maker/.venv/Lib/site-packages/httpcore/_utils.py

37 lines
1.5 KiB
Python

import select
import socket
import sys
import typing
def is_socket_readable(sock: typing.Optional[socket.socket]) -> bool:
"""
Return whether a socket, as identifed by its file descriptor, is readable.
"A socket is readable" means that the read buffer isn't empty, i.e. that calling
.recv() on it would immediately return some data.
"""
# NOTE: we want check for readability without actually attempting to read, because
# we don't want to block forever if it's not readable.
# In the case that the socket no longer exists, or cannot return a file
# descriptor, we treat it as being readable, as if it the next read operation
# on it is ready to return the terminating `b""`.
sock_fd = None if sock is None else sock.fileno()
if sock_fd is None or sock_fd < 0: # pragma: nocover
return True
# The implementation below was stolen from:
# https://github.com/python-trio/trio/blob/20ee2b1b7376db637435d80e266212a35837ddcc/trio/_socket.py#L471-L478
# See also: https://github.com/encode/httpcore/pull/193#issuecomment-703129316
# Use select.select on Windows, and when poll is unavailable and select.poll
# everywhere else. (E.g. When eventlet is in use. See #327)
if (
sys.platform == "win32" or getattr(select, "poll", None) is None
): # pragma: nocover
rready, _, _ = select.select([sock_fd], [], [], 0)
return bool(rready)
p = select.poll()
p.register(sock_fd, select.POLLIN)
return bool(p.poll(0))