def _accept_connection(self, protocol_factory, sock,
sslcontext=None, server=None, backlog=100):
# This method is only called once for each event loop tick where the
# listening socket has triggered an EVENT_READ. There may be multiple
# connections waiting for an .accept() so it is called in a loop.
# See https://bugs.python.org/issue27906 for more details.
for _ in range(backlog):
try:
conn, addr = sock.accept()
if self._debug:
logger.debug("%r got a new connection from %r: %r",
server, addr, conn)
conn.setblocking(False)
except (BlockingIOError, InterruptedError, ConnectionAbortedError):
# Early exit because the socket accept buffer is empty.
return None
except OSError as exc:
# There's nowhere to send the error, so just log it.
if exc.errno in (errno.EMFILE, errno.ENFILE,
errno.ENOBUFS, errno.ENOMEM):
# Some platforms (e.g. Linux keep reporting the FD as
# ready, so we remove the read handler temporarily.
# We'll try again in a while.
self.call_exception_handler({
'message': 'socket.accept() out of system resource',
'exception': exc,
'socket': sock,
})
self._remove_reader(sock.fileno())
self.call_later(constants.ACCEPT_RETRY_DELAY,
self._start_serving,
protocol_factory, sock, sslcontext, server,
backlog)
else:
raise # The event loop will catch, log and ignore it.
else:
extra = {'peername': addr}
accept = self._accept_connection2(protocol_factory, conn, extra,
sslcontext, server)
self.create_task(accept)
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