diff options
Diffstat (limited to 'Lib/asyncio/selector_events.py')
| -rw-r--r-- | Lib/asyncio/selector_events.py | 1069 |
1 files changed, 1069 insertions, 0 deletions
diff --git a/Lib/asyncio/selector_events.py b/Lib/asyncio/selector_events.py new file mode 100644 index 0000000000..4bd6dc8d1c --- /dev/null +++ b/Lib/asyncio/selector_events.py @@ -0,0 +1,1069 @@ +"""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 functools +import socket +import sys +import warnings +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 +from . import sslproto +from .coroutines import coroutine +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() + 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=None, + *, server_side=False, server_hostname=None, + extra=None, server=None): + if not sslproto._is_sslproto_available(): + return self._make_legacy_ssl_transport( + rawsock, protocol, sslcontext, waiter, + server_side=server_side, server_hostname=server_hostname, + extra=extra, server=server) + + ssl_protocol = sslproto.SSLProtocol(self, protocol, sslcontext, waiter, + server_side, server_hostname) + _SelectorSocketTransport(self, rawsock, ssl_protocol, + extra=extra, server=server) + return ssl_protocol._app_transport + + def _make_legacy_ssl_transport(self, rawsock, protocol, sslcontext, + waiter, *, + server_side=False, server_hostname=None, + extra=None, server=None): + # Use the legacy API: SSL_write, SSL_read, etc. The legacy API is used + # on Python 3.4 and older, when ssl.MemoryBIO is not available. + 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_running(): + raise RuntimeError("Cannot close a running event loop") + if self.is_closed(): + return + self._close_self_pipe() + super().close() + 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. + 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: + extra = {'peername': addr} + accept = self._accept_connection2(protocol_factory, conn, extra, + sslcontext, server) + self.create_task(accept) + + @coroutine + def _accept_connection2(self, protocol_factory, conn, extra, + sslcontext=None, server=None): + protocol = None + transport = None + try: + protocol = protocol_factory() + waiter = futures.Future(loop=self) + if sslcontext: + transport = self._make_ssl_transport( + conn, protocol, sslcontext, waiter=waiter, + server_side=True, extra=extra, server=server) + else: + transport = self._make_socket_transport( + conn, protocol, waiter=waiter, extra=extra, + server=server) + + try: + yield from waiter + except: + transport.close() + raise + + # It's now up to the protocol to handle the connection. + except Exception as exc: + if self.get_debug(): + context = { + 'message': ('Error on transport creation ' + 'for incoming connection'), + 'exception': exc, + } + if protocol is not None: + context['protocol'] = protocol + if transport is not None: + context['transport'] = transport + self.call_exception_handler(context) + + 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, sock, address) + return fut + + def _sock_connect(self, fut, sock, address): + fd = sock.fileno() + try: + while True: + try: + sock.connect(address) + except InterruptedError: + continue + else: + break + except BlockingIOError: + fut.add_done_callback(functools.partial(self._sock_connect_done, + fd)) + self.add_writer(fd, self._sock_connect_cb, fut, sock, address) + except Exception as exc: + fut.set_exception(exc) + else: + fut.set_result(None) + + def _sock_connect_done(self, fd, fut): + self.remove_writer(fd) + + def _sock_connect_cb(self, fut, sock, address): + if fut.cancelled(): + return + + try: + err = sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR) + if err != 0: + # Jump to any except clause below. + raise OSError(err, 'Connect call failed %s' % (address,)) + except (BlockingIOError, InterruptedError): + # socket is still registered, the callback will be retried later + pass + 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. + + # Attribute used in the destructor: it must be set even if the constructor + # is not called (see _SelectorSslTransport which may start by raising an + # exception) + _sock = None + + def __init__(self, loop, sock, protocol, extra=None, server=None): + super().__init__(extra, loop) + 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._sock = sock + self._sock_fd = sock.fileno() + self._protocol = protocol + self._protocol_connected = True + 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__] + if self._sock is None: + info.append('closed') + elif self._closing: + info.append('closing') + info.append('fd=%s' % self._sock_fd) + # test if the transport was closed + if self._loop is not None: + 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) + + # On Python 3.3 and older, objects with a destructor part of a reference + # cycle are never destroyed. It's not more the case on Python 3.4 thanks + # to the PEP 442. + if sys.version_info >= (3, 4): + def __del__(self): + if self._sock is not None: + warnings.warn("unclosed transport %r" % self, ResourceWarning) + self._sock.close() + + def _fatal_error(self, exc, message='Fatal error on transport'): + # Should be called from exception handler only. + if isinstance(exc, (BrokenPipeError, + ConnectionResetError, ConnectionAbortedError)): + 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: + if self._protocol_connected: + 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.call_soon(self._protocol.connection_made, self) + # only start reading when connection_made() has been called + self._loop.call_soon(self._loop.add_reader, + self._sock_fd, self._read_ready) + if waiter is not None: + # only wake up the waiter when 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: + 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 not sslcontext: + sslcontext = sslproto._create_transport_context(server_side, server_hostname) + + wrap_kwargs = { + 'server_side': server_side, + 'do_handshake_on_connect': False, + } + if server_hostname and not server_side: + wrap_kwargs['server_hostname'] = server_hostname + sslsock = sslcontext.wrap_socket(rawsock, **wrap_kwargs) + + super().__init__(loop, sslsock, protocol, extra, server) + # the protocol connection is only made after the SSL handshake + self._protocol_connected = False + + self._server_hostname = server_hostname + self._waiter = waiter + 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 _wakeup_waiter(self, exc=None): + if self._waiter is None: + return + if not self._waiter.cancelled(): + if exc is not None: + self._waiter.set_exception(exc) + else: + self._waiter.set_result(None) + self._waiter = None + + 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() + self._wakeup_waiter(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() + self._wakeup_waiter(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._protocol_connected = True + self._loop.call_soon(self._protocol.connection_made, self) + # only wake up the waiter when connection_made() has been called + self._loop.call_soon(self._wakeup_waiter) + + 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: + 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.call_soon(self._protocol.connection_made, self) + # only start reading when connection_made() has been called + self._loop.call_soon(self._loop.add_reader, + self._sock_fd, self._read_ready) + if waiter is not None: + # only wake up the waiter when 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: + 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) |