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artiq/artiq/monkey_patches.py

158 lines
6.6 KiB
Python

import sys
__all__ = []
if sys.version_info[:3] == (3, 5, 1):
import asyncio
import socket
import collections
import itertools
import os
# See https://github.com/m-labs/artiq/issues/253
@asyncio.coroutines.coroutine
def create_server(self, protocol_factory, host=None, port=None,
*,
family=socket.AF_UNSPEC,
flags=socket.AI_PASSIVE,
sock=None,
backlog=100,
ssl=None,
reuse_address=None,
reuse_port=None):
"""Create a TCP server.
The host parameter can be a string, in that case the TCP server is bound
to host and port.
The host parameter can also be a sequence of strings and in that case
the TCP server is bound to all hosts of the sequence. If a host
appears multiple times (possibly indirectly e.g. when hostnames
resolve to the same IP address), the server is only bound once to that
host.
Return a Server object which can be used to stop the service.
This method is a coroutine.
"""
if isinstance(ssl, bool):
raise TypeError('ssl argument must be an SSLContext or None')
if host is not None or port is not None:
if sock is not None:
raise ValueError(
'host/port and sock can not be specified at the same time')
AF_INET6 = getattr(socket, 'AF_INET6', 0)
if reuse_address is None:
reuse_address = os.name == 'posix' and sys.platform != 'cygwin'
sockets = []
if host == '':
hosts = [None]
elif (isinstance(host, str) or
not isinstance(host, collections.Iterable)):
hosts = [host]
else:
hosts = host
fs = [self._create_server_getaddrinfo(host, port, family=family,
flags=flags)
for host in hosts]
infos = yield from asyncio.tasks.gather(*fs, loop=self)
infos = set(itertools.chain.from_iterable(infos))
completed = False
try:
for res in infos:
af, socktype, proto, canonname, sa = res
try:
sock = socket.socket(af, socktype, proto)
except socket.error:
# Assume it's a bad family/type/protocol combination.
if self._debug:
asyncio.log.logger.warning('create_server() failed to create '
'socket.socket(%r, %r, %r)',
af, socktype, proto, exc_info=True)
continue
sockets.append(sock)
if reuse_address:
sock.setsockopt(
socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
if reuse_port:
if not hasattr(socket, 'SO_REUSEPORT'):
raise ValueError(
'reuse_port not supported by socket module')
else:
sock.setsockopt(
socket.SOL_SOCKET, socket.SO_REUSEPORT, True)
# Disable IPv4/IPv6 dual stack support (enabled by
# default on Linux) which makes a single socket
# listen on both address families.
if af == AF_INET6 and hasattr(socket, 'IPPROTO_IPV6'):
sock.setsockopt(socket.IPPROTO_IPV6,
socket.IPV6_V6ONLY,
True)
try:
sock.bind(sa)
except OSError as err:
raise OSError(err.errno, 'error while attempting '
'to bind on address %r: %s'
% (sa, err.strerror.lower()))
completed = True
finally:
if not completed:
for sock in sockets:
sock.close()
else:
if sock is None:
raise ValueError('Neither host/port nor sock were specified')
sockets = [sock]
server = asyncio.base_events.Server(self, sockets)
for sock in sockets:
sock.listen(backlog)
sock.setblocking(False)
self._start_serving(protocol_factory, sock, ssl, server)
if self._debug:
asyncio.log.logger.info("%r is serving", server)
return server
asyncio.base_events.BaseEventLoop.create_server = create_server
# See https://github.com/m-labs/artiq/issues/247
def _loop_writing(self, f=None, data=None):
try:
assert f is self._write_fut
self._write_fut = None
self._pending_write = 0
if f:
f.result()
if data is None:
data = self._buffer
self._buffer = None
if not data:
if self._closing:
self._loop.call_soon(self._call_connection_lost, None)
if self._eof_written:
self._sock.shutdown(socket.SHUT_WR)
# Now that we've reduced the buffer size, tell the
# protocol to resume writing if it was paused. Note that
# we do this last since the callback is called immediately
# and it may add more data to the buffer (even causing the
# protocol to be paused again).
self._maybe_resume_protocol()
else:
self._write_fut = self._loop._proactor.send(self._sock, data)
if not self._write_fut.done():
assert self._pending_write == 0
self._pending_write = len(data)
self._write_fut.add_done_callback(self._loop_writing)
self._maybe_pause_protocol()
else:
self._write_fut.add_done_callback(self._loop_writing)
except (ConnectionResetError, ConnectionAbortedError) as exc:
self._force_close(exc)
except OSError as exc:
self._fatal_error(exc, 'Fatal write error on pipe transport')
from asyncio import proactor_events
proactor_events._ProactorBaseWritePipeTransport._loop_writing = _loop_writing