cpython/Lib/asyncio/selector_events.py

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"""Event loop using a selector and related classes.
A selector is a "notify-when-ready" multiplexer. For a subclass which
also includes support for signal handling, see the unix_events sub-module.
"""
__all__ = ['BaseSelectorEventLoop']
import collections
import errno
import socket
try:
import ssl
except ImportError: # pragma: no cover
ssl = None
from . import base_events
from . import constants
from . import events
from . import futures
from . import selectors
from . import transports
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from .log import logger
def _test_selector_event(selector, fd, event):
# Test if the selector is monitoring 'event' events
# for the file descriptor 'fd'.
try:
key = selector.get_key(fd)
except KeyError:
return False
else:
return bool(key.events & event)
class BaseSelectorEventLoop(base_events.BaseEventLoop):
"""Selector event loop.
See events.EventLoop for API specification.
"""
def __init__(self, selector=None):
super().__init__()
if selector is None:
selector = selectors.DefaultSelector()
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logger.debug('Using selector: %s', selector.__class__.__name__)
self._selector = selector
self._make_self_pipe()
def _make_socket_transport(self, sock, protocol, waiter=None, *,
extra=None, server=None):
return _SelectorSocketTransport(self, sock, protocol, waiter,
extra, server)
def _make_ssl_transport(self, rawsock, protocol, sslcontext, waiter, *,
server_side=False, server_hostname=None,
extra=None, server=None):
return _SelectorSslTransport(
self, rawsock, protocol, sslcontext, waiter,
server_side, server_hostname, extra, server)
def _make_datagram_transport(self, sock, protocol,
address=None, waiter=None, extra=None):
return _SelectorDatagramTransport(self, sock, protocol,
address, waiter, extra)
def close(self):
if self.is_closed():
return
super().close()
self._close_self_pipe()
if self._selector is not None:
self._selector.close()
self._selector = None
def _socketpair(self):
raise NotImplementedError
def _close_self_pipe(self):
self.remove_reader(self._ssock.fileno())
self._ssock.close()
self._ssock = None
self._csock.close()
self._csock = None
self._internal_fds -= 1
def _make_self_pipe(self):
# A self-socket, really. :-)
self._ssock, self._csock = self._socketpair()
self._ssock.setblocking(False)
self._csock.setblocking(False)
self._internal_fds += 1
self.add_reader(self._ssock.fileno(), self._read_from_self)
def _process_self_data(self, data):
pass
def _read_from_self(self):
while True:
try:
data = self._ssock.recv(4096)
if not data:
break
self._process_self_data(data)
except InterruptedError:
continue
except BlockingIOError:
break
def _write_to_self(self):
# This may be called from a different thread, possibly after
# _close_self_pipe() has been called or even while it is
# running. Guard for self._csock being None or closed. When
# a socket is closed, send() raises OSError (with errno set to
# EBADF, but let's not rely on the exact error code).
csock = self._csock
if csock is not None:
try:
csock.send(b'\0')
except OSError:
if self._debug:
logger.debug("Fail to write a null byte into the "
"self-pipe socket",
exc_info=True)
def _start_serving(self, protocol_factory, sock,
sslcontext=None, server=None):
self.add_reader(sock.fileno(), self._accept_connection,
protocol_factory, sock, sslcontext, server)
def _accept_connection(self, protocol_factory, sock,
sslcontext=None, server=None):
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):
pass # False alarm.
except OSError as exc:
# There's nowhere to send the error, so just log it.
# TODO: Someone will want an error handler for this.
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)
else:
raise # The event loop will catch, log and ignore it.
else:
if sslcontext:
self._make_ssl_transport(
conn, protocol_factory(), sslcontext, None,
server_side=True, extra={'peername': addr}, server=server)
else:
self._make_socket_transport(
conn, protocol_factory(), extra={'peername': addr},
server=server)
# It's now up to the protocol to handle the connection.
def add_reader(self, fd, callback, *args):
"""Add a reader callback."""
self._check_closed()
handle = events.Handle(callback, args, self)
try:
key = self._selector.get_key(fd)
except KeyError:
self._selector.register(fd, selectors.EVENT_READ,
(handle, None))
else:
mask, (reader, writer) = key.events, key.data
self._selector.modify(fd, mask | selectors.EVENT_READ,
(handle, writer))
if reader is not None:
reader.cancel()
def remove_reader(self, fd):
"""Remove a reader callback."""
if self.is_closed():
return False
try:
key = self._selector.get_key(fd)
except KeyError:
return False
else:
mask, (reader, writer) = key.events, key.data
mask &= ~selectors.EVENT_READ
if not mask:
self._selector.unregister(fd)
else:
self._selector.modify(fd, mask, (None, writer))
if reader is not None:
reader.cancel()
return True
else:
return False
def add_writer(self, fd, callback, *args):
"""Add a writer callback.."""
self._check_closed()
handle = events.Handle(callback, args, self)
try:
key = self._selector.get_key(fd)
except KeyError:
self._selector.register(fd, selectors.EVENT_WRITE,
(None, handle))
else:
mask, (reader, writer) = key.events, key.data
self._selector.modify(fd, mask | selectors.EVENT_WRITE,
(reader, handle))
if writer is not None:
writer.cancel()
def remove_writer(self, fd):
"""Remove a writer callback."""
if self.is_closed():
return False
try:
key = self._selector.get_key(fd)
except KeyError:
return False
else:
mask, (reader, writer) = key.events, key.data
# Remove both writer and connector.
mask &= ~selectors.EVENT_WRITE
if not mask:
self._selector.unregister(fd)
else:
self._selector.modify(fd, mask, (reader, None))
if writer is not None:
writer.cancel()
return True
else:
return False
def sock_recv(self, sock, n):
"""Receive data from the socket.
The return value is a bytes object representing the data received.
The maximum amount of data to be received at once is specified by
nbytes.
This method is a coroutine.
"""
if self.get_debug() and sock.gettimeout() != 0:
raise ValueError("the socket must be non-blocking")
fut = futures.Future(loop=self)
self._sock_recv(fut, False, sock, n)
return fut
def _sock_recv(self, fut, registered, sock, n):
# _sock_recv() can add itself as an I/O callback if the operation can't
# be done immediately. Don't use it directly, call sock_recv().
fd = sock.fileno()
if registered:
# Remove the callback early. It should be rare that the
# selector says the fd is ready but the call still returns
# EAGAIN, and I am willing to take a hit in that case in
# order to simplify the common case.
self.remove_reader(fd)
if fut.cancelled():
return
try:
data = sock.recv(n)
except (BlockingIOError, InterruptedError):
self.add_reader(fd, self._sock_recv, fut, True, sock, n)
except Exception as exc:
fut.set_exception(exc)
else:
fut.set_result(data)
def sock_sendall(self, sock, data):
"""Send data to the socket.
The socket must be connected to a remote socket. This method continues
to send data from data until either all data has been sent or an
error occurs. None is returned on success. On error, an exception is
raised, and there is no way to determine how much data, if any, was
successfully processed by the receiving end of the connection.
This method is a coroutine.
"""
if self.get_debug() and sock.gettimeout() != 0:
raise ValueError("the socket must be non-blocking")
fut = futures.Future(loop=self)
if data:
self._sock_sendall(fut, False, sock, data)
else:
fut.set_result(None)
return fut
def _sock_sendall(self, fut, registered, sock, data):
fd = sock.fileno()
if registered:
self.remove_writer(fd)
if fut.cancelled():
return
try:
n = sock.send(data)
except (BlockingIOError, InterruptedError):
n = 0
except Exception as exc:
fut.set_exception(exc)
return
if n == len(data):
fut.set_result(None)
else:
if n:
data = data[n:]
self.add_writer(fd, self._sock_sendall, fut, True, sock, data)
def sock_connect(self, sock, address):
"""Connect to a remote socket at address.
The address must be already resolved to avoid the trap of hanging the
entire event loop when the address requires doing a DNS lookup. For
example, it must be an IP address, not an hostname, for AF_INET and
AF_INET6 address families. Use getaddrinfo() to resolve the hostname
asynchronously.
This method is a coroutine.
"""
if self.get_debug() and sock.gettimeout() != 0:
raise ValueError("the socket must be non-blocking")
fut = futures.Future(loop=self)
try:
base_events._check_resolved_address(sock, address)
except ValueError as err:
fut.set_exception(err)
else:
self._sock_connect(fut, False, sock, address)
return fut
def _sock_connect(self, fut, registered, sock, address):
fd = sock.fileno()
if registered:
self.remove_writer(fd)
if fut.cancelled():
return
try:
if not registered:
# First time around.
sock.connect(address)
else:
err = sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
if err != 0:
# Jump to the except clause below.
raise OSError(err, 'Connect call failed %s' % (address,))
except (BlockingIOError, InterruptedError):
self.add_writer(fd, self._sock_connect, fut, True, sock, address)
except Exception as exc:
fut.set_exception(exc)
else:
fut.set_result(None)
def sock_accept(self, sock):
"""Accept a connection.
The socket must be bound to an address and listening for connections.
The return value is a pair (conn, address) where conn is a new socket
object usable to send and receive data on the connection, and address
is the address bound to the socket on the other end of the connection.
This method is a coroutine.
"""
if self.get_debug() and sock.gettimeout() != 0:
raise ValueError("the socket must be non-blocking")
fut = futures.Future(loop=self)
self._sock_accept(fut, False, sock)
return fut
def _sock_accept(self, fut, registered, sock):
fd = sock.fileno()
if registered:
self.remove_reader(fd)
if fut.cancelled():
return
try:
conn, address = sock.accept()
conn.setblocking(False)
except (BlockingIOError, InterruptedError):
self.add_reader(fd, self._sock_accept, fut, True, sock)
except Exception as exc:
fut.set_exception(exc)
else:
fut.set_result((conn, address))
def _process_events(self, event_list):
for key, mask in event_list:
fileobj, (reader, writer) = key.fileobj, key.data
if mask & selectors.EVENT_READ and reader is not None:
if reader._cancelled:
self.remove_reader(fileobj)
else:
self._add_callback(reader)
if mask & selectors.EVENT_WRITE and writer is not None:
if writer._cancelled:
self.remove_writer(fileobj)
else:
self._add_callback(writer)
def _stop_serving(self, sock):
self.remove_reader(sock.fileno())
sock.close()
class _SelectorTransport(transports._FlowControlMixin,
transports.Transport):
max_size = 256 * 1024 # Buffer size passed to recv().
_buffer_factory = bytearray # Constructs initial value for self._buffer.
def __init__(self, loop, sock, protocol, extra, server=None):
super().__init__(extra)
self._extra['socket'] = sock
self._extra['sockname'] = sock.getsockname()
if 'peername' not in self._extra:
try:
self._extra['peername'] = sock.getpeername()
except socket.error:
self._extra['peername'] = None
self._loop = loop
self._sock = sock
self._sock_fd = sock.fileno()
self._protocol = protocol
self._server = server
self._buffer = self._buffer_factory()
self._conn_lost = 0 # Set when call to connection_lost scheduled.
self._closing = False # Set when close() called.
if self._server is not None:
self._server._attach()
def __repr__(self):
info = [self.__class__.__name__, 'fd=%s' % self._sock_fd]
polling = _test_selector_event(self._loop._selector,
self._sock_fd, selectors.EVENT_READ)
if polling:
info.append('read=polling')
else:
info.append('read=idle')
polling = _test_selector_event(self._loop._selector,
self._sock_fd, selectors.EVENT_WRITE)
if polling:
state = 'polling'
else:
state = 'idle'
bufsize = self.get_write_buffer_size()
info.append('write=<%s, bufsize=%s>' % (state, bufsize))
return '<%s>' % ' '.join(info)
def abort(self):
self._force_close(None)
def close(self):
if self._closing:
return
self._closing = True
self._loop.remove_reader(self._sock_fd)
if not self._buffer:
self._conn_lost += 1
self._loop.call_soon(self._call_connection_lost, None)
def _fatal_error(self, exc, message='Fatal error on transport'):
# Should be called from exception handler only.
if isinstance(exc, (BrokenPipeError, ConnectionResetError)):
if self._loop.get_debug():
logger.debug("%r: %s", self, message, exc_info=True)
else:
self._loop.call_exception_handler({
'message': message,
'exception': exc,
'transport': self,
'protocol': self._protocol,
})
self._force_close(exc)
def _force_close(self, exc):
if self._conn_lost:
return
if self._buffer:
self._buffer.clear()
self._loop.remove_writer(self._sock_fd)
if not self._closing:
self._closing = True
self._loop.remove_reader(self._sock_fd)
self._conn_lost += 1
self._loop.call_soon(self._call_connection_lost, exc)
def _call_connection_lost(self, exc):
try:
self._protocol.connection_lost(exc)
finally:
self._sock.close()
self._sock = None
self._protocol = None
self._loop = None
server = self._server
if server is not None:
server._detach()
self._server = None
def get_write_buffer_size(self):
return len(self._buffer)
class _SelectorSocketTransport(_SelectorTransport):
def __init__(self, loop, sock, protocol, waiter=None,
extra=None, server=None):
super().__init__(loop, sock, protocol, extra, server)
self._eof = False
self._paused = False
self._loop.add_reader(self._sock_fd, self._read_ready)
self._loop.call_soon(self._protocol.connection_made, self)
if waiter is not None:
# wait until protocol.connection_made() has been called
self._loop.call_soon(waiter._set_result_unless_cancelled, None)
def pause_reading(self):
if self._closing:
raise RuntimeError('Cannot pause_reading() when closing')
if self._paused:
raise RuntimeError('Already paused')
self._paused = True
self._loop.remove_reader(self._sock_fd)
if self._loop.get_debug():
logger.debug("%r pauses reading", self)
def resume_reading(self):
if not self._paused:
raise RuntimeError('Not paused')
self._paused = False
if self._closing:
return
self._loop.add_reader(self._sock_fd, self._read_ready)
if self._loop.get_debug():
logger.debug("%r resumes reading", self)
def _read_ready(self):
try:
data = self._sock.recv(self.max_size)
except (BlockingIOError, InterruptedError):
pass
except Exception as exc:
self._fatal_error(exc, 'Fatal read error on socket transport')
else:
if data:
self._protocol.data_received(data)
else:
if self._loop.get_debug():
logger.debug("%r received EOF", self)
keep_open = self._protocol.eof_received()
if keep_open:
# We're keeping the connection open so the
# protocol can write more, but we still can't
# receive more, so remove the reader callback.
self._loop.remove_reader(self._sock_fd)
else:
self.close()
def write(self, data):
if not isinstance(data, (bytes, bytearray, memoryview)):
raise TypeError('data argument must be byte-ish (%r)',
type(data))
if self._eof:
raise RuntimeError('Cannot call write() after write_eof()')
if not data:
return
if self._conn_lost:
if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES:
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logger.warning('socket.send() raised exception.')
self._conn_lost += 1
return
if not self._buffer:
# Optimization: try to send now.
try:
n = self._sock.send(data)
except (BlockingIOError, InterruptedError):
pass
except Exception as exc:
self._fatal_error(exc, 'Fatal write error on socket transport')
return
else:
data = data[n:]
if not data:
return
# Not all was written; register write handler.
self._loop.add_writer(self._sock_fd, self._write_ready)
# Add it to the buffer.
self._buffer.extend(data)
self._maybe_pause_protocol()
def _write_ready(self):
assert self._buffer, 'Data should not be empty'
try:
n = self._sock.send(self._buffer)
except (BlockingIOError, InterruptedError):
pass
except Exception as exc:
self._loop.remove_writer(self._sock_fd)
self._buffer.clear()
self._fatal_error(exc, 'Fatal write error on socket transport')
else:
if n:
del self._buffer[:n]
self._maybe_resume_protocol() # May append to buffer.
if not self._buffer:
self._loop.remove_writer(self._sock_fd)
if self._closing:
self._call_connection_lost(None)
elif self._eof:
self._sock.shutdown(socket.SHUT_WR)
def write_eof(self):
if self._eof:
return
self._eof = True
if not self._buffer:
self._sock.shutdown(socket.SHUT_WR)
def can_write_eof(self):
return True
class _SelectorSslTransport(_SelectorTransport):
_buffer_factory = bytearray
def __init__(self, loop, rawsock, protocol, sslcontext, waiter=None,
server_side=False, server_hostname=None,
extra=None, server=None):
if ssl is None:
raise RuntimeError('stdlib ssl module not available')
if server_side:
if not sslcontext:
raise ValueError('Server side ssl needs a valid SSLContext')
else:
if not sslcontext:
# Client side may pass ssl=True to use a default
# context; in that case the sslcontext passed is None.
# The default is the same as used by urllib with
# cadefault=True.
if hasattr(ssl, '_create_stdlib_context'):
sslcontext = ssl._create_stdlib_context(
cert_reqs=ssl.CERT_REQUIRED,
check_hostname=bool(server_hostname))
else:
# Fallback for Python 3.3.
sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
sslcontext.options |= ssl.OP_NO_SSLv2
sslcontext.set_default_verify_paths()
sslcontext.verify_mode = ssl.CERT_REQUIRED
wrap_kwargs = {
'server_side': server_side,
'do_handshake_on_connect': False,
}
if server_hostname and not server_side and ssl.HAS_SNI:
wrap_kwargs['server_hostname'] = server_hostname
sslsock = sslcontext.wrap_socket(rawsock, **wrap_kwargs)
super().__init__(loop, sslsock, protocol, extra, server)
self._server_hostname = server_hostname
self._waiter = waiter
self._rawsock = rawsock
self._sslcontext = sslcontext
self._paused = False
# SSL-specific extra info. (peercert is set later)
self._extra.update(sslcontext=sslcontext)
if self._loop.get_debug():
logger.debug("%r starts SSL handshake", self)
start_time = self._loop.time()
else:
start_time = None
self._on_handshake(start_time)
def _on_handshake(self, start_time):
try:
self._sock.do_handshake()
except ssl.SSLWantReadError:
self._loop.add_reader(self._sock_fd,
self._on_handshake, start_time)
return
except ssl.SSLWantWriteError:
self._loop.add_writer(self._sock_fd,
self._on_handshake, start_time)
return
except BaseException as exc:
if self._loop.get_debug():
logger.warning("%r: SSL handshake failed",
self, exc_info=True)
self._loop.remove_reader(self._sock_fd)
self._loop.remove_writer(self._sock_fd)
self._sock.close()
if self._waiter is not None:
self._waiter.set_exception(exc)
if isinstance(exc, Exception):
return
else:
raise
self._loop.remove_reader(self._sock_fd)
self._loop.remove_writer(self._sock_fd)
peercert = self._sock.getpeercert()
if not hasattr(self._sslcontext, 'check_hostname'):
# Verify hostname if requested, Python 3.4+ uses check_hostname
# and checks the hostname in do_handshake()
if (self._server_hostname and
self._sslcontext.verify_mode != ssl.CERT_NONE):
try:
ssl.match_hostname(peercert, self._server_hostname)
except Exception as exc:
if self._loop.get_debug():
logger.warning("%r: SSL handshake failed "
"on matching the hostname",
self, exc_info=True)
self._sock.close()
if self._waiter is not None:
self._waiter.set_exception(exc)
return
# Add extra info that becomes available after handshake.
self._extra.update(peercert=peercert,
cipher=self._sock.cipher(),
compression=self._sock.compression(),
)
self._read_wants_write = False
self._write_wants_read = False
self._loop.add_reader(self._sock_fd, self._read_ready)
self._loop.call_soon(self._protocol.connection_made, self)
if self._waiter is not None:
# wait until protocol.connection_made() has been called
self._loop.call_soon(self._waiter._set_result_unless_cancelled,
None)
if self._loop.get_debug():
dt = self._loop.time() - start_time
logger.debug("%r: SSL handshake took %.1f ms", self, dt * 1e3)
def pause_reading(self):
# XXX This is a bit icky, given the comment at the top of
# _read_ready(). Is it possible to evoke a deadlock? I don't
# know, although it doesn't look like it; write() will still
# accept more data for the buffer and eventually the app will
# call resume_reading() again, and things will flow again.
if self._closing:
raise RuntimeError('Cannot pause_reading() when closing')
if self._paused:
raise RuntimeError('Already paused')
self._paused = True
self._loop.remove_reader(self._sock_fd)
if self._loop.get_debug():
logger.debug("%r pauses reading", self)
def resume_reading(self):
if not self._paused:
raise RuntimeError('Not paused')
self._paused = False
if self._closing:
return
self._loop.add_reader(self._sock_fd, self._read_ready)
if self._loop.get_debug():
logger.debug("%r resumes reading", self)
def _read_ready(self):
if self._write_wants_read:
self._write_wants_read = False
self._write_ready()
if self._buffer:
self._loop.add_writer(self._sock_fd, self._write_ready)
try:
data = self._sock.recv(self.max_size)
except (BlockingIOError, InterruptedError, ssl.SSLWantReadError):
pass
except ssl.SSLWantWriteError:
self._read_wants_write = True
self._loop.remove_reader(self._sock_fd)
self._loop.add_writer(self._sock_fd, self._write_ready)
except Exception as exc:
self._fatal_error(exc, 'Fatal read error on SSL transport')
else:
if data:
self._protocol.data_received(data)
else:
try:
if self._loop.get_debug():
logger.debug("%r received EOF", self)
keep_open = self._protocol.eof_received()
if keep_open:
logger.warning('returning true from eof_received() '
'has no effect when using ssl')
finally:
self.close()
def _write_ready(self):
if self._read_wants_write:
self._read_wants_write = False
self._read_ready()
if not (self._paused or self._closing):
self._loop.add_reader(self._sock_fd, self._read_ready)
if self._buffer:
try:
n = self._sock.send(self._buffer)
except (BlockingIOError, InterruptedError, ssl.SSLWantWriteError):
n = 0
except ssl.SSLWantReadError:
n = 0
self._loop.remove_writer(self._sock_fd)
self._write_wants_read = True
except Exception as exc:
self._loop.remove_writer(self._sock_fd)
self._buffer.clear()
self._fatal_error(exc, 'Fatal write error on SSL transport')
return
if n:
del self._buffer[:n]
self._maybe_resume_protocol() # May append to buffer.
if not self._buffer:
self._loop.remove_writer(self._sock_fd)
if self._closing:
self._call_connection_lost(None)
def write(self, data):
if not isinstance(data, (bytes, bytearray, memoryview)):
raise TypeError('data argument must be byte-ish (%r)',
type(data))
if not data:
return
if self._conn_lost:
if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES:
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logger.warning('socket.send() raised exception.')
self._conn_lost += 1
return
if not self._buffer:
self._loop.add_writer(self._sock_fd, self._write_ready)
# Add it to the buffer.
self._buffer.extend(data)
self._maybe_pause_protocol()
def can_write_eof(self):
return False
class _SelectorDatagramTransport(_SelectorTransport):
_buffer_factory = collections.deque
def __init__(self, loop, sock, protocol, address=None,
waiter=None, extra=None):
super().__init__(loop, sock, protocol, extra)
self._address = address
self._loop.add_reader(self._sock_fd, self._read_ready)
self._loop.call_soon(self._protocol.connection_made, self)
if waiter is not None:
# wait until protocol.connection_made() has been called
self._loop.call_soon(waiter._set_result_unless_cancelled, None)
def get_write_buffer_size(self):
return sum(len(data) for data, _ in self._buffer)
def _read_ready(self):
try:
data, addr = self._sock.recvfrom(self.max_size)
except (BlockingIOError, InterruptedError):
pass
except OSError as exc:
self._protocol.error_received(exc)
except Exception as exc:
self._fatal_error(exc, 'Fatal read error on datagram transport')
else:
self._protocol.datagram_received(data, addr)
def sendto(self, data, addr=None):
if not isinstance(data, (bytes, bytearray, memoryview)):
raise TypeError('data argument must be byte-ish (%r)',
type(data))
if not data:
return
if self._address and addr not in (None, self._address):
raise ValueError('Invalid address: must be None or %s' %
(self._address,))
if self._conn_lost and self._address:
if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES:
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logger.warning('socket.send() raised exception.')
self._conn_lost += 1
return
if not self._buffer:
# Attempt to send it right away first.
try:
if self._address:
self._sock.send(data)
else:
self._sock.sendto(data, addr)
return
except (BlockingIOError, InterruptedError):
self._loop.add_writer(self._sock_fd, self._sendto_ready)
except OSError as exc:
self._protocol.error_received(exc)
return
except Exception as exc:
self._fatal_error(exc,
'Fatal write error on datagram transport')
return
# Ensure that what we buffer is immutable.
self._buffer.append((bytes(data), addr))
self._maybe_pause_protocol()
def _sendto_ready(self):
while self._buffer:
data, addr = self._buffer.popleft()
try:
if self._address:
self._sock.send(data)
else:
self._sock.sendto(data, addr)
except (BlockingIOError, InterruptedError):
self._buffer.appendleft((data, addr)) # Try again later.
break
except OSError as exc:
self._protocol.error_received(exc)
return
except Exception as exc:
self._fatal_error(exc,
'Fatal write error on datagram transport')
return
self._maybe_resume_protocol() # May append to buffer.
if not self._buffer:
self._loop.remove_writer(self._sock_fd)
if self._closing:
self._call_connection_lost(None)