| """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 selectors |
| import socket |
| import warnings |
| import weakref |
| 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 protocols |
| from . import sslproto |
| from . import transports |
| from . import trsock |
| 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() |
| self._transports = weakref.WeakValueDictionary() |
| |
| 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, |
| ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT): |
| ssl_protocol = sslproto.SSLProtocol( |
| self, protocol, sslcontext, waiter, |
| server_side, server_hostname, |
| ssl_handshake_timeout=ssl_handshake_timeout) |
| _SelectorSocketTransport(self, rawsock, ssl_protocol, |
| extra=extra, server=server) |
| return ssl_protocol._app_transport |
| |
| 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 _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 = socket.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 None: |
| return |
| |
| 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, backlog=100, |
| ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT): |
| self._add_reader(sock.fileno(), self._accept_connection, |
| protocol_factory, sock, sslcontext, server, backlog, |
| ssl_handshake_timeout) |
| |
| def _accept_connection( |
| self, protocol_factory, sock, |
| sslcontext=None, server=None, backlog=100, |
| ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT): |
| # 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': trsock.TransportSocket(sock), |
| }) |
| self._remove_reader(sock.fileno()) |
| self.call_later(constants.ACCEPT_RETRY_DELAY, |
| self._start_serving, |
| protocol_factory, sock, sslcontext, server, |
| backlog, ssl_handshake_timeout) |
| 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, |
| ssl_handshake_timeout) |
| self.create_task(accept) |
| |
| async def _accept_connection2( |
| self, protocol_factory, conn, extra, |
| sslcontext=None, server=None, |
| ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT): |
| protocol = None |
| transport = None |
| try: |
| protocol = protocol_factory() |
| waiter = self.create_future() |
| if sslcontext: |
| transport = self._make_ssl_transport( |
| conn, protocol, sslcontext, waiter=waiter, |
| server_side=True, extra=extra, server=server, |
| ssl_handshake_timeout=ssl_handshake_timeout) |
| else: |
| transport = self._make_socket_transport( |
| conn, protocol, waiter=waiter, extra=extra, |
| server=server) |
| |
| try: |
| await waiter |
| except BaseException: |
| transport.close() |
| raise |
| # It's now up to the protocol to handle the connection. |
| |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| if self._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 _ensure_fd_no_transport(self, fd): |
| fileno = fd |
| if not isinstance(fileno, int): |
| try: |
| fileno = int(fileno.fileno()) |
| except (AttributeError, TypeError, ValueError): |
| # This code matches selectors._fileobj_to_fd function. |
| raise ValueError(f"Invalid file object: {fd!r}") from None |
| try: |
| transport = self._transports[fileno] |
| except KeyError: |
| pass |
| else: |
| if not transport.is_closing(): |
| raise RuntimeError( |
| f'File descriptor {fd!r} is used by transport ' |
| f'{transport!r}') |
| |
| def _add_reader(self, fd, callback, *args): |
| self._check_closed() |
| handle = events.Handle(callback, args, self, None) |
| 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() |
| return handle |
| |
| def _remove_reader(self, fd): |
| 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): |
| self._check_closed() |
| handle = events.Handle(callback, args, self, None) |
| 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() |
| return handle |
| |
| 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 add_reader(self, fd, callback, *args): |
| """Add a reader callback.""" |
| self._ensure_fd_no_transport(fd) |
| self._add_reader(fd, callback, *args) |
| |
| def remove_reader(self, fd): |
| """Remove a reader callback.""" |
| self._ensure_fd_no_transport(fd) |
| return self._remove_reader(fd) |
| |
| def add_writer(self, fd, callback, *args): |
| """Add a writer callback..""" |
| self._ensure_fd_no_transport(fd) |
| self._add_writer(fd, callback, *args) |
| |
| def remove_writer(self, fd): |
| """Remove a writer callback.""" |
| self._ensure_fd_no_transport(fd) |
| return self._remove_writer(fd) |
| |
| async 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. |
| """ |
| base_events._check_ssl_socket(sock) |
| if self._debug and sock.gettimeout() != 0: |
| raise ValueError("the socket must be non-blocking") |
| try: |
| return sock.recv(n) |
| except (BlockingIOError, InterruptedError): |
| pass |
| fut = self.create_future() |
| fd = sock.fileno() |
| self._ensure_fd_no_transport(fd) |
| handle = self._add_reader(fd, self._sock_recv, fut, sock, n) |
| fut.add_done_callback( |
| functools.partial(self._sock_read_done, fd, handle=handle)) |
| return await fut |
| |
| def _sock_read_done(self, fd, fut, handle=None): |
| if handle is None or not handle.cancelled(): |
| self.remove_reader(fd) |
| |
| def _sock_recv(self, fut, 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(). |
| if fut.done(): |
| return |
| try: |
| data = sock.recv(n) |
| except (BlockingIOError, InterruptedError): |
| return # try again next time |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| fut.set_exception(exc) |
| else: |
| fut.set_result(data) |
| |
| async def sock_recv_into(self, sock, buf): |
| """Receive data from the socket. |
| |
| The received data is written into *buf* (a writable buffer). |
| The return value is the number of bytes written. |
| """ |
| base_events._check_ssl_socket(sock) |
| if self._debug and sock.gettimeout() != 0: |
| raise ValueError("the socket must be non-blocking") |
| try: |
| return sock.recv_into(buf) |
| except (BlockingIOError, InterruptedError): |
| pass |
| fut = self.create_future() |
| fd = sock.fileno() |
| self._ensure_fd_no_transport(fd) |
| handle = self._add_reader(fd, self._sock_recv_into, fut, sock, buf) |
| fut.add_done_callback( |
| functools.partial(self._sock_read_done, fd, handle=handle)) |
| return await fut |
| |
| def _sock_recv_into(self, fut, sock, buf): |
| # _sock_recv_into() can add itself as an I/O callback if the operation |
| # can't be done immediately. Don't use it directly, call |
| # sock_recv_into(). |
| if fut.done(): |
| return |
| try: |
| nbytes = sock.recv_into(buf) |
| except (BlockingIOError, InterruptedError): |
| return # try again next time |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| fut.set_exception(exc) |
| else: |
| fut.set_result(nbytes) |
| |
| async 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. |
| """ |
| base_events._check_ssl_socket(sock) |
| if self._debug and sock.gettimeout() != 0: |
| raise ValueError("the socket must be non-blocking") |
| try: |
| n = sock.send(data) |
| except (BlockingIOError, InterruptedError): |
| n = 0 |
| |
| if n == len(data): |
| # all data sent |
| return |
| |
| fut = self.create_future() |
| fd = sock.fileno() |
| self._ensure_fd_no_transport(fd) |
| # use a trick with a list in closure to store a mutable state |
| handle = self._add_writer(fd, self._sock_sendall, fut, sock, |
| memoryview(data), [n]) |
| fut.add_done_callback( |
| functools.partial(self._sock_write_done, fd, handle=handle)) |
| return await fut |
| |
| def _sock_sendall(self, fut, sock, view, pos): |
| if fut.done(): |
| # Future cancellation can be scheduled on previous loop iteration |
| return |
| start = pos[0] |
| try: |
| n = sock.send(view[start:]) |
| except (BlockingIOError, InterruptedError): |
| return |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| fut.set_exception(exc) |
| return |
| |
| start += n |
| |
| if start == len(view): |
| fut.set_result(None) |
| else: |
| pos[0] = start |
| |
| async def sock_connect(self, sock, address): |
| """Connect to a remote socket at address. |
| |
| This method is a coroutine. |
| """ |
| base_events._check_ssl_socket(sock) |
| if self._debug and sock.gettimeout() != 0: |
| raise ValueError("the socket must be non-blocking") |
| |
| if not hasattr(socket, 'AF_UNIX') or sock.family != socket.AF_UNIX: |
| resolved = await self._ensure_resolved( |
| address, family=sock.family, type=sock.type, proto=sock.proto, |
| loop=self, |
| ) |
| _, _, _, _, address = resolved[0] |
| |
| fut = self.create_future() |
| self._sock_connect(fut, sock, address) |
| return await fut |
| |
| def _sock_connect(self, fut, sock, address): |
| fd = sock.fileno() |
| try: |
| sock.connect(address) |
| except (BlockingIOError, InterruptedError): |
| # Issue #23618: When the C function connect() fails with EINTR, the |
| # connection runs in background. We have to wait until the socket |
| # becomes writable to be notified when the connection succeed or |
| # fails. |
| self._ensure_fd_no_transport(fd) |
| handle = self._add_writer( |
| fd, self._sock_connect_cb, fut, sock, address) |
| fut.add_done_callback( |
| functools.partial(self._sock_write_done, fd, handle=handle)) |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| fut.set_exception(exc) |
| else: |
| fut.set_result(None) |
| |
| def _sock_write_done(self, fd, fut, handle=None): |
| if handle is None or not handle.cancelled(): |
| self.remove_writer(fd) |
| |
| def _sock_connect_cb(self, fut, sock, address): |
| if fut.done(): |
| return |
| |
| try: |
| err = sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR) |
| if err != 0: |
| # Jump to any except clause below. |
| raise OSError(err, f'Connect call failed {address}') |
| except (BlockingIOError, InterruptedError): |
| # socket is still registered, the callback will be retried later |
| pass |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| fut.set_exception(exc) |
| else: |
| fut.set_result(None) |
| |
| async 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. |
| """ |
| base_events._check_ssl_socket(sock) |
| if self._debug and sock.gettimeout() != 0: |
| raise ValueError("the socket must be non-blocking") |
| fut = self.create_future() |
| self._sock_accept(fut, sock) |
| return await fut |
| |
| def _sock_accept(self, fut, sock): |
| fd = sock.fileno() |
| try: |
| conn, address = sock.accept() |
| conn.setblocking(False) |
| except (BlockingIOError, InterruptedError): |
| self._ensure_fd_no_transport(fd) |
| handle = self._add_reader(fd, self._sock_accept, fut, sock) |
| fut.add_done_callback( |
| functools.partial(self._sock_read_done, fd, handle=handle)) |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| fut.set_exception(exc) |
| else: |
| fut.set_result((conn, address)) |
| |
| async def _sendfile_native(self, transp, file, offset, count): |
| del self._transports[transp._sock_fd] |
| resume_reading = transp.is_reading() |
| transp.pause_reading() |
| await transp._make_empty_waiter() |
| try: |
| return await self.sock_sendfile(transp._sock, file, offset, count, |
| fallback=False) |
| finally: |
| transp._reset_empty_waiter() |
| if resume_reading: |
| transp.resume_reading() |
| self._transports[transp._sock_fd] = transp |
| |
| 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'] = trsock.TransportSocket(sock) |
| try: |
| self._extra['sockname'] = sock.getsockname() |
| except OSError: |
| self._extra['sockname'] = None |
| 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_connected = False |
| self.set_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() |
| loop._transports[self._sock_fd] = self |
| |
| def __repr__(self): |
| info = [self.__class__.__name__] |
| if self._sock is None: |
| info.append('closed') |
| elif self._closing: |
| info.append('closing') |
| info.append(f'fd={self._sock_fd}') |
| # test if the transport was closed |
| if self._loop is not None and not self._loop.is_closed(): |
| 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(f'write=<{state}, bufsize={bufsize}>') |
| return '<{}>'.format(' '.join(info)) |
| |
| def abort(self): |
| self._force_close(None) |
| |
| def set_protocol(self, protocol): |
| self._protocol = protocol |
| self._protocol_connected = True |
| |
| def get_protocol(self): |
| return self._protocol |
| |
| def is_closing(self): |
| return self._closing |
| |
| 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._remove_writer(self._sock_fd) |
| self._loop.call_soon(self._call_connection_lost, None) |
| |
| def __del__(self, _warn=warnings.warn): |
| if self._sock is not None: |
| _warn(f"unclosed transport {self!r}", ResourceWarning, source=self) |
| self._sock.close() |
| |
| def _fatal_error(self, exc, message='Fatal error on transport'): |
| # Should be called from exception handler only. |
| if isinstance(exc, OSError): |
| 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) |
| |
| def _add_reader(self, fd, callback, *args): |
| if self._closing: |
| return |
| |
| self._loop._add_reader(fd, callback, *args) |
| |
| |
| class _SelectorSocketTransport(_SelectorTransport): |
| |
| _start_tls_compatible = True |
| _sendfile_compatible = constants._SendfileMode.TRY_NATIVE |
| |
| def __init__(self, loop, sock, protocol, waiter=None, |
| extra=None, server=None): |
| |
| self._read_ready_cb = None |
| super().__init__(loop, sock, protocol, extra, server) |
| self._eof = False |
| self._paused = False |
| self._empty_waiter = None |
| |
| # Disable the Nagle algorithm -- small writes will be |
| # sent without waiting for the TCP ACK. This generally |
| # decreases the latency (in some cases significantly.) |
| base_events._set_nodelay(self._sock) |
| |
| self._loop.call_soon(self._protocol.connection_made, self) |
| # only start reading when connection_made() has been called |
| self._loop.call_soon(self._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(futures._set_result_unless_cancelled, |
| waiter, None) |
| |
| def set_protocol(self, protocol): |
| if isinstance(protocol, protocols.BufferedProtocol): |
| self._read_ready_cb = self._read_ready__get_buffer |
| else: |
| self._read_ready_cb = self._read_ready__data_received |
| |
| super().set_protocol(protocol) |
| |
| def is_reading(self): |
| return not self._paused and not self._closing |
| |
| def pause_reading(self): |
| if self._closing or self._paused: |
| return |
| 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 self._closing or not self._paused: |
| return |
| self._paused = False |
| self._add_reader(self._sock_fd, self._read_ready) |
| if self._loop.get_debug(): |
| logger.debug("%r resumes reading", self) |
| |
| def _read_ready(self): |
| self._read_ready_cb() |
| |
| def _read_ready__get_buffer(self): |
| if self._conn_lost: |
| return |
| |
| try: |
| buf = self._protocol.get_buffer(-1) |
| if not len(buf): |
| raise RuntimeError('get_buffer() returned an empty buffer') |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| self._fatal_error( |
| exc, 'Fatal error: protocol.get_buffer() call failed.') |
| return |
| |
| try: |
| nbytes = self._sock.recv_into(buf) |
| except (BlockingIOError, InterruptedError): |
| return |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| self._fatal_error(exc, 'Fatal read error on socket transport') |
| return |
| |
| if not nbytes: |
| self._read_ready__on_eof() |
| return |
| |
| try: |
| self._protocol.buffer_updated(nbytes) |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| self._fatal_error( |
| exc, 'Fatal error: protocol.buffer_updated() call failed.') |
| |
| def _read_ready__data_received(self): |
| if self._conn_lost: |
| return |
| try: |
| data = self._sock.recv(self.max_size) |
| except (BlockingIOError, InterruptedError): |
| return |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| self._fatal_error(exc, 'Fatal read error on socket transport') |
| return |
| |
| if not data: |
| self._read_ready__on_eof() |
| return |
| |
| try: |
| self._protocol.data_received(data) |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| self._fatal_error( |
| exc, 'Fatal error: protocol.data_received() call failed.') |
| |
| def _read_ready__on_eof(self): |
| if self._loop.get_debug(): |
| logger.debug("%r received EOF", self) |
| |
| try: |
| keep_open = self._protocol.eof_received() |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| self._fatal_error( |
| exc, 'Fatal error: protocol.eof_received() call failed.') |
| return |
| |
| 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(f'data argument must be a bytes-like object, ' |
| f'not {type(data).__name__!r}') |
| if self._eof: |
| raise RuntimeError('Cannot call write() after write_eof()') |
| if self._empty_waiter is not None: |
| raise RuntimeError('unable to write; sendfile is in progress') |
| 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 (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException 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' |
| |
| if self._conn_lost: |
| return |
| try: |
| n = self._sock.send(self._buffer) |
| except (BlockingIOError, InterruptedError): |
| pass |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException as exc: |
| self._loop._remove_writer(self._sock_fd) |
| self._buffer.clear() |
| self._fatal_error(exc, 'Fatal write error on socket transport') |
| if self._empty_waiter is not None: |
| self._empty_waiter.set_exception(exc) |
| 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._empty_waiter is not None: |
| self._empty_waiter.set_result(None) |
| if self._closing: |
| self._call_connection_lost(None) |
| elif self._eof: |
| self._sock.shutdown(socket.SHUT_WR) |
| |
| def write_eof(self): |
| if self._closing or self._eof: |
| return |
| self._eof = True |
| if not self._buffer: |
| self._sock.shutdown(socket.SHUT_WR) |
| |
| def can_write_eof(self): |
| return True |
| |
| def _call_connection_lost(self, exc): |
| super()._call_connection_lost(exc) |
| if self._empty_waiter is not None: |
| self._empty_waiter.set_exception( |
| ConnectionError("Connection is closed by peer")) |
| |
| def _make_empty_waiter(self): |
| if self._empty_waiter is not None: |
| raise RuntimeError("Empty waiter is already set") |
| self._empty_waiter = self._loop.create_future() |
| if not self._buffer: |
| self._empty_waiter.set_result(None) |
| return self._empty_waiter |
| |
| def _reset_empty_waiter(self): |
| self._empty_waiter = None |
| |
| |
| 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._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(futures._set_result_unless_cancelled, |
| waiter, None) |
| |
| def get_write_buffer_size(self): |
| return sum(len(data) for data, _ in self._buffer) |
| |
| def _read_ready(self): |
| if self._conn_lost: |
| return |
| try: |
| data, addr = self._sock.recvfrom(self.max_size) |
| except (BlockingIOError, InterruptedError): |
| pass |
| except OSError as exc: |
| self._protocol.error_received(exc) |
| except (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException 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(f'data argument must be a bytes-like object, ' |
| f'not {type(data).__name__!r}') |
| if not data: |
| return |
| |
| if self._address: |
| if addr not in (None, self._address): |
| raise ValueError( |
| f'Invalid address: must be None or {self._address}') |
| addr = 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._extra['peername']: |
| 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 (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException 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._extra['peername']: |
| 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 (SystemExit, KeyboardInterrupt): |
| raise |
| except BaseException 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) |
