Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 1 | """Event loop using a selector and related classes. |
| 2 | |
| 3 | A selector is a "notify-when-ready" multiplexer. For a subclass which |
| 4 | also includes support for signal handling, see the unix_events sub-module. |
| 5 | """ |
| 6 | |
Victor Stinner | 8dffc45 | 2014-01-25 15:32:06 +0100 | [diff] [blame] | 7 | __all__ = ['BaseSelectorEventLoop'] |
| 8 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 9 | import collections |
Guido van Rossum | 3317a13 | 2013-11-01 14:12:50 -0700 | [diff] [blame] | 10 | import errno |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 11 | import functools |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 12 | import socket |
Victor Stinner | 231b404 | 2015-01-14 00:19:09 +0100 | [diff] [blame] | 13 | import sys |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 14 | try: |
| 15 | import ssl |
| 16 | except ImportError: # pragma: no cover |
| 17 | ssl = None |
| 18 | |
| 19 | from . import base_events |
| 20 | from . import constants |
| 21 | from . import events |
| 22 | from . import futures |
| 23 | from . import selectors |
| 24 | from . import transports |
Victor Stinner | 231b404 | 2015-01-14 00:19:09 +0100 | [diff] [blame] | 25 | from . import sslproto |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 26 | from .log import logger |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 27 | |
| 28 | |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 29 | def _test_selector_event(selector, fd, event): |
| 30 | # Test if the selector is monitoring 'event' events |
| 31 | # for the file descriptor 'fd'. |
| 32 | try: |
| 33 | key = selector.get_key(fd) |
| 34 | except KeyError: |
| 35 | return False |
| 36 | else: |
| 37 | return bool(key.events & event) |
| 38 | |
| 39 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 40 | class BaseSelectorEventLoop(base_events.BaseEventLoop): |
| 41 | """Selector event loop. |
| 42 | |
| 43 | See events.EventLoop for API specification. |
| 44 | """ |
| 45 | |
| 46 | def __init__(self, selector=None): |
| 47 | super().__init__() |
| 48 | |
| 49 | if selector is None: |
| 50 | selector = selectors.DefaultSelector() |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 51 | logger.debug('Using selector: %s', selector.__class__.__name__) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 52 | self._selector = selector |
| 53 | self._make_self_pipe() |
| 54 | |
| 55 | def _make_socket_transport(self, sock, protocol, waiter=None, *, |
| 56 | extra=None, server=None): |
| 57 | return _SelectorSocketTransport(self, sock, protocol, waiter, |
| 58 | extra, server) |
| 59 | |
Victor Stinner | 15cc678 | 2015-01-09 00:09:10 +0100 | [diff] [blame] | 60 | def _make_ssl_transport(self, rawsock, protocol, sslcontext, waiter=None, |
| 61 | *, server_side=False, server_hostname=None, |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 62 | extra=None, server=None): |
Victor Stinner | 231b404 | 2015-01-14 00:19:09 +0100 | [diff] [blame] | 63 | if not sslproto._is_sslproto_available(): |
| 64 | return self._make_legacy_ssl_transport( |
| 65 | rawsock, protocol, sslcontext, waiter, |
| 66 | server_side=server_side, server_hostname=server_hostname, |
| 67 | extra=extra, server=server) |
| 68 | |
| 69 | ssl_protocol = sslproto.SSLProtocol(self, protocol, sslcontext, waiter, |
| 70 | server_side, server_hostname) |
| 71 | _SelectorSocketTransport(self, rawsock, ssl_protocol, |
| 72 | extra=extra, server=server) |
| 73 | return ssl_protocol._app_transport |
| 74 | |
| 75 | def _make_legacy_ssl_transport(self, rawsock, protocol, sslcontext, |
| 76 | waiter, *, |
| 77 | server_side=False, server_hostname=None, |
| 78 | extra=None, server=None): |
| 79 | # Use the legacy API: SSL_write, SSL_read, etc. The legacy API is used |
| 80 | # on Python 3.4 and older, when ssl.MemoryBIO is not available. |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 81 | return _SelectorSslTransport( |
| 82 | self, rawsock, protocol, sslcontext, waiter, |
| 83 | server_side, server_hostname, extra, server) |
| 84 | |
| 85 | def _make_datagram_transport(self, sock, protocol, |
Victor Stinner | bfff45d | 2014-07-08 23:57:31 +0200 | [diff] [blame] | 86 | address=None, waiter=None, extra=None): |
| 87 | return _SelectorDatagramTransport(self, sock, protocol, |
| 88 | address, waiter, extra) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 89 | |
| 90 | def close(self): |
Victor Stinner | 956de69 | 2014-12-26 21:07:52 +0100 | [diff] [blame] | 91 | if self.is_running(): |
Victor Stinner | 5e63120 | 2014-11-21 00:23:27 +0100 | [diff] [blame] | 92 | raise RuntimeError("Cannot close a running event loop") |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 93 | if self.is_closed(): |
| 94 | return |
| 95 | self._close_self_pipe() |
Victor Stinner | 5e63120 | 2014-11-21 00:23:27 +0100 | [diff] [blame] | 96 | super().close() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 97 | if self._selector is not None: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 98 | self._selector.close() |
| 99 | self._selector = None |
| 100 | |
| 101 | def _socketpair(self): |
| 102 | raise NotImplementedError |
| 103 | |
| 104 | def _close_self_pipe(self): |
| 105 | self.remove_reader(self._ssock.fileno()) |
| 106 | self._ssock.close() |
| 107 | self._ssock = None |
| 108 | self._csock.close() |
| 109 | self._csock = None |
| 110 | self._internal_fds -= 1 |
| 111 | |
| 112 | def _make_self_pipe(self): |
| 113 | # A self-socket, really. :-) |
| 114 | self._ssock, self._csock = self._socketpair() |
| 115 | self._ssock.setblocking(False) |
| 116 | self._csock.setblocking(False) |
| 117 | self._internal_fds += 1 |
| 118 | self.add_reader(self._ssock.fileno(), self._read_from_self) |
| 119 | |
Victor Stinner | fe5649c | 2014-07-17 22:43:40 +0200 | [diff] [blame] | 120 | def _process_self_data(self, data): |
| 121 | pass |
| 122 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 123 | def _read_from_self(self): |
Victor Stinner | 54c4b8e | 2014-06-19 12:59:15 +0200 | [diff] [blame] | 124 | while True: |
| 125 | try: |
| 126 | data = self._ssock.recv(4096) |
| 127 | if not data: |
| 128 | break |
Victor Stinner | fe5649c | 2014-07-17 22:43:40 +0200 | [diff] [blame] | 129 | self._process_self_data(data) |
Victor Stinner | 54c4b8e | 2014-06-19 12:59:15 +0200 | [diff] [blame] | 130 | except InterruptedError: |
| 131 | continue |
| 132 | except BlockingIOError: |
| 133 | break |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 134 | |
| 135 | def _write_to_self(self): |
Guido van Rossum | 3d139d8 | 2014-05-06 14:42:40 -0700 | [diff] [blame] | 136 | # This may be called from a different thread, possibly after |
| 137 | # _close_self_pipe() has been called or even while it is |
| 138 | # running. Guard for self._csock being None or closed. When |
| 139 | # a socket is closed, send() raises OSError (with errno set to |
| 140 | # EBADF, but let's not rely on the exact error code). |
| 141 | csock = self._csock |
| 142 | if csock is not None: |
| 143 | try: |
Victor Stinner | fe5649c | 2014-07-17 22:43:40 +0200 | [diff] [blame] | 144 | csock.send(b'\0') |
Guido van Rossum | 3d139d8 | 2014-05-06 14:42:40 -0700 | [diff] [blame] | 145 | except OSError: |
Victor Stinner | 65dd69a | 2014-07-25 22:36:05 +0200 | [diff] [blame] | 146 | if self._debug: |
| 147 | logger.debug("Fail to write a null byte into the " |
| 148 | "self-pipe socket", |
| 149 | exc_info=True) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 150 | |
Guido van Rossum | 28dff0d | 2013-11-01 14:22:30 -0700 | [diff] [blame] | 151 | def _start_serving(self, protocol_factory, sock, |
| 152 | sslcontext=None, server=None): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 153 | self.add_reader(sock.fileno(), self._accept_connection, |
Guido van Rossum | 28dff0d | 2013-11-01 14:22:30 -0700 | [diff] [blame] | 154 | protocol_factory, sock, sslcontext, server) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 155 | |
Guido van Rossum | 28dff0d | 2013-11-01 14:22:30 -0700 | [diff] [blame] | 156 | def _accept_connection(self, protocol_factory, sock, |
| 157 | sslcontext=None, server=None): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 158 | try: |
| 159 | conn, addr = sock.accept() |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 160 | if self._debug: |
| 161 | logger.debug("%r got a new connection from %r: %r", |
| 162 | server, addr, conn) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 163 | conn.setblocking(False) |
Guido van Rossum | 3317a13 | 2013-11-01 14:12:50 -0700 | [diff] [blame] | 164 | except (BlockingIOError, InterruptedError, ConnectionAbortedError): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 165 | pass # False alarm. |
Guido van Rossum | 3317a13 | 2013-11-01 14:12:50 -0700 | [diff] [blame] | 166 | except OSError as exc: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 167 | # There's nowhere to send the error, so just log it. |
Guido van Rossum | 3317a13 | 2013-11-01 14:12:50 -0700 | [diff] [blame] | 168 | if exc.errno in (errno.EMFILE, errno.ENFILE, |
| 169 | errno.ENOBUFS, errno.ENOMEM): |
| 170 | # Some platforms (e.g. Linux keep reporting the FD as |
| 171 | # ready, so we remove the read handler temporarily. |
| 172 | # We'll try again in a while. |
Yury Selivanov | ff827f0 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 173 | self.call_exception_handler({ |
| 174 | 'message': 'socket.accept() out of system resource', |
| 175 | 'exception': exc, |
| 176 | 'socket': sock, |
| 177 | }) |
Guido van Rossum | 3317a13 | 2013-11-01 14:12:50 -0700 | [diff] [blame] | 178 | self.remove_reader(sock.fileno()) |
| 179 | self.call_later(constants.ACCEPT_RETRY_DELAY, |
| 180 | self._start_serving, |
Guido van Rossum | 28dff0d | 2013-11-01 14:22:30 -0700 | [diff] [blame] | 181 | protocol_factory, sock, sslcontext, server) |
Guido van Rossum | 3317a13 | 2013-11-01 14:12:50 -0700 | [diff] [blame] | 182 | else: |
| 183 | raise # The event loop will catch, log and ignore it. |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 184 | else: |
Victor Stinner | 29ad011 | 2015-01-15 00:04:21 +0100 | [diff] [blame^] | 185 | protocol = protocol_factory() |
Guido van Rossum | 28dff0d | 2013-11-01 14:22:30 -0700 | [diff] [blame] | 186 | if sslcontext: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 187 | self._make_ssl_transport( |
Victor Stinner | 29ad011 | 2015-01-15 00:04:21 +0100 | [diff] [blame^] | 188 | conn, protocol, sslcontext, |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 189 | server_side=True, extra={'peername': addr}, server=server) |
| 190 | else: |
| 191 | self._make_socket_transport( |
Victor Stinner | 29ad011 | 2015-01-15 00:04:21 +0100 | [diff] [blame^] | 192 | conn, protocol , extra={'peername': addr}, |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 193 | server=server) |
| 194 | # It's now up to the protocol to handle the connection. |
| 195 | |
| 196 | def add_reader(self, fd, callback, *args): |
| 197 | """Add a reader callback.""" |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 198 | self._check_closed() |
Yury Selivanov | ff827f0 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 199 | handle = events.Handle(callback, args, self) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 200 | try: |
| 201 | key = self._selector.get_key(fd) |
| 202 | except KeyError: |
| 203 | self._selector.register(fd, selectors.EVENT_READ, |
| 204 | (handle, None)) |
| 205 | else: |
| 206 | mask, (reader, writer) = key.events, key.data |
| 207 | self._selector.modify(fd, mask | selectors.EVENT_READ, |
| 208 | (handle, writer)) |
| 209 | if reader is not None: |
| 210 | reader.cancel() |
| 211 | |
| 212 | def remove_reader(self, fd): |
| 213 | """Remove a reader callback.""" |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 214 | if self.is_closed(): |
Victor Stinner | eeeebcd | 2014-03-06 00:52:53 +0100 | [diff] [blame] | 215 | return False |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 216 | try: |
| 217 | key = self._selector.get_key(fd) |
| 218 | except KeyError: |
| 219 | return False |
| 220 | else: |
| 221 | mask, (reader, writer) = key.events, key.data |
| 222 | mask &= ~selectors.EVENT_READ |
| 223 | if not mask: |
| 224 | self._selector.unregister(fd) |
| 225 | else: |
| 226 | self._selector.modify(fd, mask, (None, writer)) |
| 227 | |
| 228 | if reader is not None: |
| 229 | reader.cancel() |
| 230 | return True |
| 231 | else: |
| 232 | return False |
| 233 | |
| 234 | def add_writer(self, fd, callback, *args): |
| 235 | """Add a writer callback..""" |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 236 | self._check_closed() |
Yury Selivanov | ff827f0 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 237 | handle = events.Handle(callback, args, self) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 238 | try: |
| 239 | key = self._selector.get_key(fd) |
| 240 | except KeyError: |
| 241 | self._selector.register(fd, selectors.EVENT_WRITE, |
| 242 | (None, handle)) |
| 243 | else: |
| 244 | mask, (reader, writer) = key.events, key.data |
| 245 | self._selector.modify(fd, mask | selectors.EVENT_WRITE, |
| 246 | (reader, handle)) |
| 247 | if writer is not None: |
| 248 | writer.cancel() |
| 249 | |
| 250 | def remove_writer(self, fd): |
| 251 | """Remove a writer callback.""" |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 252 | if self.is_closed(): |
Victor Stinner | eeeebcd | 2014-03-06 00:52:53 +0100 | [diff] [blame] | 253 | return False |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 254 | try: |
| 255 | key = self._selector.get_key(fd) |
| 256 | except KeyError: |
| 257 | return False |
| 258 | else: |
| 259 | mask, (reader, writer) = key.events, key.data |
| 260 | # Remove both writer and connector. |
| 261 | mask &= ~selectors.EVENT_WRITE |
| 262 | if not mask: |
| 263 | self._selector.unregister(fd) |
| 264 | else: |
| 265 | self._selector.modify(fd, mask, (reader, None)) |
| 266 | |
| 267 | if writer is not None: |
| 268 | writer.cancel() |
| 269 | return True |
| 270 | else: |
| 271 | return False |
| 272 | |
| 273 | def sock_recv(self, sock, n): |
Victor Stinner | d143209 | 2014-06-19 17:11:49 +0200 | [diff] [blame] | 274 | """Receive data from the socket. |
| 275 | |
| 276 | The return value is a bytes object representing the data received. |
| 277 | The maximum amount of data to be received at once is specified by |
| 278 | nbytes. |
| 279 | |
| 280 | This method is a coroutine. |
| 281 | """ |
Victor Stinner | 9c9f1f1 | 2014-07-29 23:08:17 +0200 | [diff] [blame] | 282 | if self.get_debug() and sock.gettimeout() != 0: |
| 283 | raise ValueError("the socket must be non-blocking") |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 284 | fut = futures.Future(loop=self) |
| 285 | self._sock_recv(fut, False, sock, n) |
| 286 | return fut |
| 287 | |
| 288 | def _sock_recv(self, fut, registered, sock, n): |
Victor Stinner | 2877346 | 2014-02-13 09:24:37 +0100 | [diff] [blame] | 289 | # _sock_recv() can add itself as an I/O callback if the operation can't |
Yury Selivanov | b0b0e62 | 2014-02-18 22:27:48 -0500 | [diff] [blame] | 290 | # be done immediately. Don't use it directly, call sock_recv(). |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 291 | fd = sock.fileno() |
| 292 | if registered: |
| 293 | # Remove the callback early. It should be rare that the |
| 294 | # selector says the fd is ready but the call still returns |
| 295 | # EAGAIN, and I am willing to take a hit in that case in |
| 296 | # order to simplify the common case. |
| 297 | self.remove_reader(fd) |
| 298 | if fut.cancelled(): |
| 299 | return |
| 300 | try: |
| 301 | data = sock.recv(n) |
| 302 | except (BlockingIOError, InterruptedError): |
| 303 | self.add_reader(fd, self._sock_recv, fut, True, sock, n) |
| 304 | except Exception as exc: |
| 305 | fut.set_exception(exc) |
| 306 | else: |
| 307 | fut.set_result(data) |
| 308 | |
| 309 | def sock_sendall(self, sock, data): |
Victor Stinner | d143209 | 2014-06-19 17:11:49 +0200 | [diff] [blame] | 310 | """Send data to the socket. |
| 311 | |
| 312 | The socket must be connected to a remote socket. This method continues |
| 313 | to send data from data until either all data has been sent or an |
| 314 | error occurs. None is returned on success. On error, an exception is |
| 315 | raised, and there is no way to determine how much data, if any, was |
| 316 | successfully processed by the receiving end of the connection. |
| 317 | |
| 318 | This method is a coroutine. |
| 319 | """ |
Victor Stinner | 9c9f1f1 | 2014-07-29 23:08:17 +0200 | [diff] [blame] | 320 | if self.get_debug() and sock.gettimeout() != 0: |
| 321 | raise ValueError("the socket must be non-blocking") |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 322 | fut = futures.Future(loop=self) |
| 323 | if data: |
| 324 | self._sock_sendall(fut, False, sock, data) |
| 325 | else: |
| 326 | fut.set_result(None) |
| 327 | return fut |
| 328 | |
| 329 | def _sock_sendall(self, fut, registered, sock, data): |
| 330 | fd = sock.fileno() |
| 331 | |
| 332 | if registered: |
| 333 | self.remove_writer(fd) |
| 334 | if fut.cancelled(): |
| 335 | return |
| 336 | |
| 337 | try: |
| 338 | n = sock.send(data) |
| 339 | except (BlockingIOError, InterruptedError): |
| 340 | n = 0 |
| 341 | except Exception as exc: |
| 342 | fut.set_exception(exc) |
| 343 | return |
| 344 | |
| 345 | if n == len(data): |
| 346 | fut.set_result(None) |
| 347 | else: |
| 348 | if n: |
| 349 | data = data[n:] |
| 350 | self.add_writer(fd, self._sock_sendall, fut, True, sock, data) |
| 351 | |
| 352 | def sock_connect(self, sock, address): |
Victor Stinner | d143209 | 2014-06-19 17:11:49 +0200 | [diff] [blame] | 353 | """Connect to a remote socket at address. |
| 354 | |
| 355 | The address must be already resolved to avoid the trap of hanging the |
| 356 | entire event loop when the address requires doing a DNS lookup. For |
| 357 | example, it must be an IP address, not an hostname, for AF_INET and |
| 358 | AF_INET6 address families. Use getaddrinfo() to resolve the hostname |
| 359 | asynchronously. |
| 360 | |
| 361 | This method is a coroutine. |
| 362 | """ |
Victor Stinner | 9c9f1f1 | 2014-07-29 23:08:17 +0200 | [diff] [blame] | 363 | if self.get_debug() and sock.gettimeout() != 0: |
| 364 | raise ValueError("the socket must be non-blocking") |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 365 | fut = futures.Future(loop=self) |
Victor Stinner | 2877346 | 2014-02-13 09:24:37 +0100 | [diff] [blame] | 366 | try: |
| 367 | base_events._check_resolved_address(sock, address) |
| 368 | except ValueError as err: |
| 369 | fut.set_exception(err) |
| 370 | else: |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 371 | self._sock_connect(fut, sock, address) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 372 | return fut |
| 373 | |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 374 | def _sock_connect(self, fut, sock, address): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 375 | fd = sock.fileno() |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 376 | try: |
| 377 | while True: |
| 378 | try: |
| 379 | sock.connect(address) |
| 380 | except InterruptedError: |
| 381 | continue |
| 382 | else: |
| 383 | break |
| 384 | except BlockingIOError: |
| 385 | fut.add_done_callback(functools.partial(self._sock_connect_done, |
Victor Stinner | 3531d90 | 2015-01-09 01:42:52 +0100 | [diff] [blame] | 386 | fd)) |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 387 | self.add_writer(fd, self._sock_connect_cb, fut, sock, address) |
| 388 | except Exception as exc: |
| 389 | fut.set_exception(exc) |
| 390 | else: |
| 391 | fut.set_result(None) |
| 392 | |
Victor Stinner | 3531d90 | 2015-01-09 01:42:52 +0100 | [diff] [blame] | 393 | def _sock_connect_done(self, fd, fut): |
| 394 | self.remove_writer(fd) |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 395 | |
| 396 | def _sock_connect_cb(self, fut, sock, address): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 397 | if fut.cancelled(): |
| 398 | return |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 399 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 400 | try: |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 401 | err = sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR) |
| 402 | if err != 0: |
| 403 | # Jump to any except clause below. |
| 404 | raise OSError(err, 'Connect call failed %s' % (address,)) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 405 | except (BlockingIOError, InterruptedError): |
Victor Stinner | d5aeccf9 | 2014-08-31 15:07:57 +0200 | [diff] [blame] | 406 | # socket is still registered, the callback will be retried later |
| 407 | pass |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 408 | except Exception as exc: |
| 409 | fut.set_exception(exc) |
| 410 | else: |
| 411 | fut.set_result(None) |
| 412 | |
| 413 | def sock_accept(self, sock): |
Victor Stinner | d143209 | 2014-06-19 17:11:49 +0200 | [diff] [blame] | 414 | """Accept a connection. |
| 415 | |
| 416 | The socket must be bound to an address and listening for connections. |
| 417 | The return value is a pair (conn, address) where conn is a new socket |
| 418 | object usable to send and receive data on the connection, and address |
| 419 | is the address bound to the socket on the other end of the connection. |
| 420 | |
| 421 | This method is a coroutine. |
| 422 | """ |
Victor Stinner | 9c9f1f1 | 2014-07-29 23:08:17 +0200 | [diff] [blame] | 423 | if self.get_debug() and sock.gettimeout() != 0: |
| 424 | raise ValueError("the socket must be non-blocking") |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 425 | fut = futures.Future(loop=self) |
| 426 | self._sock_accept(fut, False, sock) |
| 427 | return fut |
| 428 | |
| 429 | def _sock_accept(self, fut, registered, sock): |
| 430 | fd = sock.fileno() |
| 431 | if registered: |
| 432 | self.remove_reader(fd) |
| 433 | if fut.cancelled(): |
| 434 | return |
| 435 | try: |
| 436 | conn, address = sock.accept() |
| 437 | conn.setblocking(False) |
| 438 | except (BlockingIOError, InterruptedError): |
| 439 | self.add_reader(fd, self._sock_accept, fut, True, sock) |
| 440 | except Exception as exc: |
| 441 | fut.set_exception(exc) |
| 442 | else: |
| 443 | fut.set_result((conn, address)) |
| 444 | |
| 445 | def _process_events(self, event_list): |
| 446 | for key, mask in event_list: |
| 447 | fileobj, (reader, writer) = key.fileobj, key.data |
| 448 | if mask & selectors.EVENT_READ and reader is not None: |
| 449 | if reader._cancelled: |
| 450 | self.remove_reader(fileobj) |
| 451 | else: |
| 452 | self._add_callback(reader) |
| 453 | if mask & selectors.EVENT_WRITE and writer is not None: |
| 454 | if writer._cancelled: |
| 455 | self.remove_writer(fileobj) |
| 456 | else: |
| 457 | self._add_callback(writer) |
| 458 | |
| 459 | def _stop_serving(self, sock): |
| 460 | self.remove_reader(sock.fileno()) |
| 461 | sock.close() |
| 462 | |
| 463 | |
Yury Selivanov | c098241 | 2014-02-18 18:41:13 -0500 | [diff] [blame] | 464 | class _SelectorTransport(transports._FlowControlMixin, |
| 465 | transports.Transport): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 466 | |
| 467 | max_size = 256 * 1024 # Buffer size passed to recv(). |
| 468 | |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 469 | _buffer_factory = bytearray # Constructs initial value for self._buffer. |
| 470 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 471 | def __init__(self, loop, sock, protocol, extra, server=None): |
Victor Stinner | 004adb9 | 2014-11-05 15:27:41 +0100 | [diff] [blame] | 472 | super().__init__(extra, loop) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 473 | self._extra['socket'] = sock |
| 474 | self._extra['sockname'] = sock.getsockname() |
| 475 | if 'peername' not in self._extra: |
| 476 | try: |
| 477 | self._extra['peername'] = sock.getpeername() |
| 478 | except socket.error: |
| 479 | self._extra['peername'] = None |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 480 | self._sock = sock |
| 481 | self._sock_fd = sock.fileno() |
| 482 | self._protocol = protocol |
| 483 | self._server = server |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 484 | self._buffer = self._buffer_factory() |
Guido van Rossum | 2546a17 | 2013-10-18 10:10:36 -0700 | [diff] [blame] | 485 | self._conn_lost = 0 # Set when call to connection_lost scheduled. |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 486 | self._closing = False # Set when close() called. |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 487 | if self._server is not None: |
Victor Stinner | b28dbac | 2014-07-11 22:52:21 +0200 | [diff] [blame] | 488 | self._server._attach() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 489 | |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 490 | def __repr__(self): |
Victor Stinner | 0e34dc3 | 2014-10-12 09:52:11 +0200 | [diff] [blame] | 491 | info = [self.__class__.__name__] |
| 492 | if self._sock is None: |
| 493 | info.append('closed') |
| 494 | elif self._closing: |
| 495 | info.append('closing') |
| 496 | info.append('fd=%s' % self._sock_fd) |
Victor Stinner | b261475 | 2014-08-25 23:20:52 +0200 | [diff] [blame] | 497 | # test if the transport was closed |
| 498 | if self._loop is not None: |
| 499 | polling = _test_selector_event(self._loop._selector, |
| 500 | self._sock_fd, selectors.EVENT_READ) |
| 501 | if polling: |
| 502 | info.append('read=polling') |
| 503 | else: |
| 504 | info.append('read=idle') |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 505 | |
Victor Stinner | b261475 | 2014-08-25 23:20:52 +0200 | [diff] [blame] | 506 | polling = _test_selector_event(self._loop._selector, |
Victor Stinner | 15cc678 | 2015-01-09 00:09:10 +0100 | [diff] [blame] | 507 | self._sock_fd, |
| 508 | selectors.EVENT_WRITE) |
Victor Stinner | b261475 | 2014-08-25 23:20:52 +0200 | [diff] [blame] | 509 | if polling: |
| 510 | state = 'polling' |
| 511 | else: |
| 512 | state = 'idle' |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 513 | |
Victor Stinner | b261475 | 2014-08-25 23:20:52 +0200 | [diff] [blame] | 514 | bufsize = self.get_write_buffer_size() |
| 515 | info.append('write=<%s, bufsize=%s>' % (state, bufsize)) |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 516 | return '<%s>' % ' '.join(info) |
| 517 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 518 | def abort(self): |
| 519 | self._force_close(None) |
| 520 | |
| 521 | def close(self): |
| 522 | if self._closing: |
| 523 | return |
| 524 | self._closing = True |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 525 | self._loop.remove_reader(self._sock_fd) |
| 526 | if not self._buffer: |
Guido van Rossum | 2546a17 | 2013-10-18 10:10:36 -0700 | [diff] [blame] | 527 | self._conn_lost += 1 |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 528 | self._loop.call_soon(self._call_connection_lost, None) |
| 529 | |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 530 | def _fatal_error(self, exc, message='Fatal error on transport'): |
Guido van Rossum | 2546a17 | 2013-10-18 10:10:36 -0700 | [diff] [blame] | 531 | # Should be called from exception handler only. |
Victor Stinner | 231b404 | 2015-01-14 00:19:09 +0100 | [diff] [blame] | 532 | if isinstance(exc, (BrokenPipeError, |
| 533 | ConnectionResetError, ConnectionAbortedError)): |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 534 | if self._loop.get_debug(): |
| 535 | logger.debug("%r: %s", self, message, exc_info=True) |
| 536 | else: |
Yury Selivanov | ff827f0 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 537 | self._loop.call_exception_handler({ |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 538 | 'message': message, |
Yury Selivanov | ff827f0 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 539 | 'exception': exc, |
| 540 | 'transport': self, |
| 541 | 'protocol': self._protocol, |
| 542 | }) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 543 | self._force_close(exc) |
| 544 | |
| 545 | def _force_close(self, exc): |
Guido van Rossum | 2546a17 | 2013-10-18 10:10:36 -0700 | [diff] [blame] | 546 | if self._conn_lost: |
| 547 | return |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 548 | if self._buffer: |
| 549 | self._buffer.clear() |
| 550 | self._loop.remove_writer(self._sock_fd) |
Guido van Rossum | 2546a17 | 2013-10-18 10:10:36 -0700 | [diff] [blame] | 551 | if not self._closing: |
| 552 | self._closing = True |
| 553 | self._loop.remove_reader(self._sock_fd) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 554 | self._conn_lost += 1 |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 555 | self._loop.call_soon(self._call_connection_lost, exc) |
| 556 | |
| 557 | def _call_connection_lost(self, exc): |
| 558 | try: |
| 559 | self._protocol.connection_lost(exc) |
| 560 | finally: |
| 561 | self._sock.close() |
| 562 | self._sock = None |
| 563 | self._protocol = None |
| 564 | self._loop = None |
| 565 | server = self._server |
| 566 | if server is not None: |
Victor Stinner | b28dbac | 2014-07-11 22:52:21 +0200 | [diff] [blame] | 567 | server._detach() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 568 | self._server = None |
| 569 | |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 570 | def get_write_buffer_size(self): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 571 | return len(self._buffer) |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 572 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 573 | |
| 574 | class _SelectorSocketTransport(_SelectorTransport): |
| 575 | |
| 576 | def __init__(self, loop, sock, protocol, waiter=None, |
| 577 | extra=None, server=None): |
| 578 | super().__init__(loop, sock, protocol, extra, server) |
| 579 | self._eof = False |
| 580 | self._paused = False |
| 581 | |
| 582 | self._loop.add_reader(self._sock_fd, self._read_ready) |
| 583 | self._loop.call_soon(self._protocol.connection_made, self) |
| 584 | if waiter is not None: |
Victor Stinner | bfff45d | 2014-07-08 23:57:31 +0200 | [diff] [blame] | 585 | # wait until protocol.connection_made() has been called |
Victor Stinner | 799a60c | 2014-07-07 18:08:22 +0200 | [diff] [blame] | 586 | self._loop.call_soon(waiter._set_result_unless_cancelled, None) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 587 | |
Guido van Rossum | 57497ad | 2013-10-18 07:58:20 -0700 | [diff] [blame] | 588 | def pause_reading(self): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 589 | if self._closing: |
| 590 | raise RuntimeError('Cannot pause_reading() when closing') |
| 591 | if self._paused: |
| 592 | raise RuntimeError('Already paused') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 593 | self._paused = True |
| 594 | self._loop.remove_reader(self._sock_fd) |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 595 | if self._loop.get_debug(): |
| 596 | logger.debug("%r pauses reading", self) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 597 | |
Guido van Rossum | 57497ad | 2013-10-18 07:58:20 -0700 | [diff] [blame] | 598 | def resume_reading(self): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 599 | if not self._paused: |
| 600 | raise RuntimeError('Not paused') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 601 | self._paused = False |
| 602 | if self._closing: |
| 603 | return |
| 604 | self._loop.add_reader(self._sock_fd, self._read_ready) |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 605 | if self._loop.get_debug(): |
| 606 | logger.debug("%r resumes reading", self) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 607 | |
| 608 | def _read_ready(self): |
| 609 | try: |
| 610 | data = self._sock.recv(self.max_size) |
| 611 | except (BlockingIOError, InterruptedError): |
| 612 | pass |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 613 | except Exception as exc: |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 614 | self._fatal_error(exc, 'Fatal read error on socket transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 615 | else: |
| 616 | if data: |
| 617 | self._protocol.data_received(data) |
| 618 | else: |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 619 | if self._loop.get_debug(): |
| 620 | logger.debug("%r received EOF", self) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 621 | keep_open = self._protocol.eof_received() |
Guido van Rossum | 1f683bb | 2013-10-30 14:36:58 -0700 | [diff] [blame] | 622 | if keep_open: |
| 623 | # We're keeping the connection open so the |
| 624 | # protocol can write more, but we still can't |
| 625 | # receive more, so remove the reader callback. |
| 626 | self._loop.remove_reader(self._sock_fd) |
| 627 | else: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 628 | self.close() |
| 629 | |
| 630 | def write(self, data): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 631 | if not isinstance(data, (bytes, bytearray, memoryview)): |
| 632 | raise TypeError('data argument must be byte-ish (%r)', |
| 633 | type(data)) |
| 634 | if self._eof: |
| 635 | raise RuntimeError('Cannot call write() after write_eof()') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 636 | if not data: |
| 637 | return |
| 638 | |
| 639 | if self._conn_lost: |
| 640 | if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES: |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 641 | logger.warning('socket.send() raised exception.') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 642 | self._conn_lost += 1 |
| 643 | return |
| 644 | |
| 645 | if not self._buffer: |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 646 | # Optimization: try to send now. |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 647 | try: |
| 648 | n = self._sock.send(data) |
| 649 | except (BlockingIOError, InterruptedError): |
Guido van Rossum | 2546a17 | 2013-10-18 10:10:36 -0700 | [diff] [blame] | 650 | pass |
| 651 | except Exception as exc: |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 652 | self._fatal_error(exc, 'Fatal write error on socket transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 653 | return |
| 654 | else: |
| 655 | data = data[n:] |
| 656 | if not data: |
| 657 | return |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 658 | # Not all was written; register write handler. |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 659 | self._loop.add_writer(self._sock_fd, self._write_ready) |
| 660 | |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 661 | # Add it to the buffer. |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 662 | self._buffer.extend(data) |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 663 | self._maybe_pause_protocol() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 664 | |
| 665 | def _write_ready(self): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 666 | assert self._buffer, 'Data should not be empty' |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 667 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 668 | try: |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 669 | n = self._sock.send(self._buffer) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 670 | except (BlockingIOError, InterruptedError): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 671 | pass |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 672 | except Exception as exc: |
| 673 | self._loop.remove_writer(self._sock_fd) |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 674 | self._buffer.clear() |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 675 | self._fatal_error(exc, 'Fatal write error on socket transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 676 | else: |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 677 | if n: |
| 678 | del self._buffer[:n] |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 679 | self._maybe_resume_protocol() # May append to buffer. |
| 680 | if not self._buffer: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 681 | self._loop.remove_writer(self._sock_fd) |
| 682 | if self._closing: |
| 683 | self._call_connection_lost(None) |
| 684 | elif self._eof: |
| 685 | self._sock.shutdown(socket.SHUT_WR) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 686 | |
| 687 | def write_eof(self): |
| 688 | if self._eof: |
| 689 | return |
| 690 | self._eof = True |
| 691 | if not self._buffer: |
| 692 | self._sock.shutdown(socket.SHUT_WR) |
| 693 | |
| 694 | def can_write_eof(self): |
| 695 | return True |
| 696 | |
| 697 | |
| 698 | class _SelectorSslTransport(_SelectorTransport): |
| 699 | |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 700 | _buffer_factory = bytearray |
| 701 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 702 | def __init__(self, loop, rawsock, protocol, sslcontext, waiter=None, |
| 703 | server_side=False, server_hostname=None, |
| 704 | extra=None, server=None): |
Guido van Rossum | 28dff0d | 2013-11-01 14:22:30 -0700 | [diff] [blame] | 705 | if ssl is None: |
| 706 | raise RuntimeError('stdlib ssl module not available') |
| 707 | |
Victor Stinner | 231b404 | 2015-01-14 00:19:09 +0100 | [diff] [blame] | 708 | if not sslcontext: |
| 709 | sslcontext = sslproto._create_transport_context(server_side, server_hostname) |
Guido van Rossum | 28dff0d | 2013-11-01 14:22:30 -0700 | [diff] [blame] | 710 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 711 | wrap_kwargs = { |
| 712 | 'server_side': server_side, |
| 713 | 'do_handshake_on_connect': False, |
| 714 | } |
Benjamin Peterson | 7243b57 | 2014-11-23 17:04:34 -0600 | [diff] [blame] | 715 | if server_hostname and not server_side: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 716 | wrap_kwargs['server_hostname'] = server_hostname |
| 717 | sslsock = sslcontext.wrap_socket(rawsock, **wrap_kwargs) |
| 718 | |
| 719 | super().__init__(loop, sslsock, protocol, extra, server) |
| 720 | |
| 721 | self._server_hostname = server_hostname |
| 722 | self._waiter = waiter |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 723 | self._sslcontext = sslcontext |
| 724 | self._paused = False |
| 725 | |
| 726 | # SSL-specific extra info. (peercert is set later) |
| 727 | self._extra.update(sslcontext=sslcontext) |
| 728 | |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 729 | if self._loop.get_debug(): |
| 730 | logger.debug("%r starts SSL handshake", self) |
| 731 | start_time = self._loop.time() |
| 732 | else: |
| 733 | start_time = None |
| 734 | self._on_handshake(start_time) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 735 | |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 736 | def _on_handshake(self, start_time): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 737 | try: |
| 738 | self._sock.do_handshake() |
| 739 | except ssl.SSLWantReadError: |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 740 | self._loop.add_reader(self._sock_fd, |
| 741 | self._on_handshake, start_time) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 742 | return |
| 743 | except ssl.SSLWantWriteError: |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 744 | self._loop.add_writer(self._sock_fd, |
| 745 | self._on_handshake, start_time) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 746 | return |
| 747 | except BaseException as exc: |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 748 | if self._loop.get_debug(): |
| 749 | logger.warning("%r: SSL handshake failed", |
| 750 | self, exc_info=True) |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 751 | self._loop.remove_reader(self._sock_fd) |
| 752 | self._loop.remove_writer(self._sock_fd) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 753 | self._sock.close() |
Victor Stinner | 177e9f0 | 2015-01-14 16:56:20 +0100 | [diff] [blame] | 754 | if self._waiter is not None and not self._waiter.cancelled(): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 755 | self._waiter.set_exception(exc) |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 756 | if isinstance(exc, Exception): |
| 757 | return |
| 758 | else: |
| 759 | raise |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 760 | |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 761 | self._loop.remove_reader(self._sock_fd) |
| 762 | self._loop.remove_writer(self._sock_fd) |
| 763 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 764 | peercert = self._sock.getpeercert() |
Christian Heimes | 6d8c1ab | 2013-12-06 00:23:13 +0100 | [diff] [blame] | 765 | if not hasattr(self._sslcontext, 'check_hostname'): |
| 766 | # Verify hostname if requested, Python 3.4+ uses check_hostname |
| 767 | # and checks the hostname in do_handshake() |
| 768 | if (self._server_hostname and |
| 769 | self._sslcontext.verify_mode != ssl.CERT_NONE): |
| 770 | try: |
| 771 | ssl.match_hostname(peercert, self._server_hostname) |
| 772 | except Exception as exc: |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 773 | if self._loop.get_debug(): |
| 774 | logger.warning("%r: SSL handshake failed " |
| 775 | "on matching the hostname", |
| 776 | self, exc_info=True) |
Christian Heimes | 6d8c1ab | 2013-12-06 00:23:13 +0100 | [diff] [blame] | 777 | self._sock.close() |
Victor Stinner | b92626d | 2015-01-14 17:13:28 +0100 | [diff] [blame] | 778 | if (self._waiter is not None |
| 779 | and not self._waiter.cancelled()): |
Christian Heimes | 6d8c1ab | 2013-12-06 00:23:13 +0100 | [diff] [blame] | 780 | self._waiter.set_exception(exc) |
| 781 | return |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 782 | |
| 783 | # Add extra info that becomes available after handshake. |
| 784 | self._extra.update(peercert=peercert, |
| 785 | cipher=self._sock.cipher(), |
| 786 | compression=self._sock.compression(), |
| 787 | ) |
| 788 | |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 789 | self._read_wants_write = False |
| 790 | self._write_wants_read = False |
| 791 | self._loop.add_reader(self._sock_fd, self._read_ready) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 792 | self._loop.call_soon(self._protocol.connection_made, self) |
| 793 | if self._waiter is not None: |
Victor Stinner | bfff45d | 2014-07-08 23:57:31 +0200 | [diff] [blame] | 794 | # wait until protocol.connection_made() has been called |
Victor Stinner | a9acbe8 | 2014-07-05 15:29:41 +0200 | [diff] [blame] | 795 | self._loop.call_soon(self._waiter._set_result_unless_cancelled, |
| 796 | None) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 797 | |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 798 | if self._loop.get_debug(): |
| 799 | dt = self._loop.time() - start_time |
| 800 | logger.debug("%r: SSL handshake took %.1f ms", self, dt * 1e3) |
| 801 | |
Guido van Rossum | 57497ad | 2013-10-18 07:58:20 -0700 | [diff] [blame] | 802 | def pause_reading(self): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 803 | # XXX This is a bit icky, given the comment at the top of |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 804 | # _read_ready(). Is it possible to evoke a deadlock? I don't |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 805 | # know, although it doesn't look like it; write() will still |
| 806 | # accept more data for the buffer and eventually the app will |
Guido van Rossum | 57497ad | 2013-10-18 07:58:20 -0700 | [diff] [blame] | 807 | # call resume_reading() again, and things will flow again. |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 808 | |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 809 | if self._closing: |
| 810 | raise RuntimeError('Cannot pause_reading() when closing') |
| 811 | if self._paused: |
| 812 | raise RuntimeError('Already paused') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 813 | self._paused = True |
| 814 | self._loop.remove_reader(self._sock_fd) |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 815 | if self._loop.get_debug(): |
| 816 | logger.debug("%r pauses reading", self) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 817 | |
Guido van Rossum | 57497ad | 2013-10-18 07:58:20 -0700 | [diff] [blame] | 818 | def resume_reading(self): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 819 | if not self._paused: |
Andrew Svetlov | 3207a03 | 2014-05-27 21:24:43 +0300 | [diff] [blame] | 820 | raise RuntimeError('Not paused') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 821 | self._paused = False |
| 822 | if self._closing: |
| 823 | return |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 824 | self._loop.add_reader(self._sock_fd, self._read_ready) |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 825 | if self._loop.get_debug(): |
| 826 | logger.debug("%r resumes reading", self) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 827 | |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 828 | def _read_ready(self): |
| 829 | if self._write_wants_read: |
| 830 | self._write_wants_read = False |
| 831 | self._write_ready() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 832 | |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 833 | if self._buffer: |
| 834 | self._loop.add_writer(self._sock_fd, self._write_ready) |
| 835 | |
| 836 | try: |
| 837 | data = self._sock.recv(self.max_size) |
| 838 | except (BlockingIOError, InterruptedError, ssl.SSLWantReadError): |
| 839 | pass |
| 840 | except ssl.SSLWantWriteError: |
| 841 | self._read_wants_write = True |
| 842 | self._loop.remove_reader(self._sock_fd) |
| 843 | self._loop.add_writer(self._sock_fd, self._write_ready) |
| 844 | except Exception as exc: |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 845 | self._fatal_error(exc, 'Fatal read error on SSL transport') |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 846 | else: |
| 847 | if data: |
| 848 | self._protocol.data_received(data) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 849 | else: |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 850 | try: |
Victor Stinner | e912e65 | 2014-07-12 03:11:53 +0200 | [diff] [blame] | 851 | if self._loop.get_debug(): |
| 852 | logger.debug("%r received EOF", self) |
Guido van Rossum | 3a70392 | 2013-11-01 14:19:35 -0700 | [diff] [blame] | 853 | keep_open = self._protocol.eof_received() |
| 854 | if keep_open: |
| 855 | logger.warning('returning true from eof_received() ' |
| 856 | 'has no effect when using ssl') |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 857 | finally: |
| 858 | self.close() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 859 | |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 860 | def _write_ready(self): |
| 861 | if self._read_wants_write: |
| 862 | self._read_wants_write = False |
| 863 | self._read_ready() |
| 864 | |
| 865 | if not (self._paused or self._closing): |
| 866 | self._loop.add_reader(self._sock_fd, self._read_ready) |
| 867 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 868 | if self._buffer: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 869 | try: |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 870 | n = self._sock.send(self._buffer) |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame] | 871 | except (BlockingIOError, InterruptedError, ssl.SSLWantWriteError): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 872 | n = 0 |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 873 | except ssl.SSLWantReadError: |
| 874 | n = 0 |
| 875 | self._loop.remove_writer(self._sock_fd) |
| 876 | self._write_wants_read = True |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 877 | except Exception as exc: |
| 878 | self._loop.remove_writer(self._sock_fd) |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 879 | self._buffer.clear() |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 880 | self._fatal_error(exc, 'Fatal write error on SSL transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 881 | return |
| 882 | |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 883 | if n: |
| 884 | del self._buffer[:n] |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 885 | |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 886 | self._maybe_resume_protocol() # May append to buffer. |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 887 | |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 888 | if not self._buffer: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 889 | self._loop.remove_writer(self._sock_fd) |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 890 | if self._closing: |
| 891 | self._call_connection_lost(None) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 892 | |
| 893 | def write(self, data): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 894 | if not isinstance(data, (bytes, bytearray, memoryview)): |
| 895 | raise TypeError('data argument must be byte-ish (%r)', |
| 896 | type(data)) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 897 | if not data: |
| 898 | return |
| 899 | |
| 900 | if self._conn_lost: |
| 901 | if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES: |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 902 | logger.warning('socket.send() raised exception.') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 903 | self._conn_lost += 1 |
| 904 | return |
| 905 | |
Guido van Rossum | 2b57016 | 2013-11-01 14:18:02 -0700 | [diff] [blame] | 906 | if not self._buffer: |
| 907 | self._loop.add_writer(self._sock_fd, self._write_ready) |
| 908 | |
| 909 | # Add it to the buffer. |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 910 | self._buffer.extend(data) |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 911 | self._maybe_pause_protocol() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 912 | |
| 913 | def can_write_eof(self): |
| 914 | return False |
| 915 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 916 | |
| 917 | class _SelectorDatagramTransport(_SelectorTransport): |
| 918 | |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 919 | _buffer_factory = collections.deque |
| 920 | |
Victor Stinner | bfff45d | 2014-07-08 23:57:31 +0200 | [diff] [blame] | 921 | def __init__(self, loop, sock, protocol, address=None, |
| 922 | waiter=None, extra=None): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 923 | super().__init__(loop, sock, protocol, extra) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 924 | self._address = address |
| 925 | self._loop.add_reader(self._sock_fd, self._read_ready) |
| 926 | self._loop.call_soon(self._protocol.connection_made, self) |
Victor Stinner | bfff45d | 2014-07-08 23:57:31 +0200 | [diff] [blame] | 927 | if waiter is not None: |
| 928 | # wait until protocol.connection_made() has been called |
| 929 | self._loop.call_soon(waiter._set_result_unless_cancelled, None) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 930 | |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 931 | def get_write_buffer_size(self): |
| 932 | return sum(len(data) for data, _ in self._buffer) |
| 933 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 934 | def _read_ready(self): |
| 935 | try: |
| 936 | data, addr = self._sock.recvfrom(self.max_size) |
| 937 | except (BlockingIOError, InterruptedError): |
| 938 | pass |
Guido van Rossum | 2335de7 | 2013-11-15 16:51:48 -0800 | [diff] [blame] | 939 | except OSError as exc: |
| 940 | self._protocol.error_received(exc) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 941 | except Exception as exc: |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 942 | self._fatal_error(exc, 'Fatal read error on datagram transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 943 | else: |
| 944 | self._protocol.datagram_received(data, addr) |
| 945 | |
| 946 | def sendto(self, data, addr=None): |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 947 | if not isinstance(data, (bytes, bytearray, memoryview)): |
| 948 | raise TypeError('data argument must be byte-ish (%r)', |
| 949 | type(data)) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 950 | if not data: |
| 951 | return |
| 952 | |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 953 | if self._address and addr not in (None, self._address): |
| 954 | raise ValueError('Invalid address: must be None or %s' % |
| 955 | (self._address,)) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 956 | |
| 957 | if self._conn_lost and self._address: |
| 958 | if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES: |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 959 | logger.warning('socket.send() raised exception.') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 960 | self._conn_lost += 1 |
| 961 | return |
| 962 | |
| 963 | if not self._buffer: |
| 964 | # Attempt to send it right away first. |
| 965 | try: |
| 966 | if self._address: |
| 967 | self._sock.send(data) |
| 968 | else: |
| 969 | self._sock.sendto(data, addr) |
| 970 | return |
Guido van Rossum | 2546a17 | 2013-10-18 10:10:36 -0700 | [diff] [blame] | 971 | except (BlockingIOError, InterruptedError): |
| 972 | self._loop.add_writer(self._sock_fd, self._sendto_ready) |
Guido van Rossum | 2335de7 | 2013-11-15 16:51:48 -0800 | [diff] [blame] | 973 | except OSError as exc: |
| 974 | self._protocol.error_received(exc) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 975 | return |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 976 | except Exception as exc: |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 977 | self._fatal_error(exc, |
| 978 | 'Fatal write error on datagram transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 979 | return |
| 980 | |
Guido van Rossum | a5062c5 | 2013-11-27 14:12:48 -0800 | [diff] [blame] | 981 | # Ensure that what we buffer is immutable. |
| 982 | self._buffer.append((bytes(data), addr)) |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 983 | self._maybe_pause_protocol() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 984 | |
| 985 | def _sendto_ready(self): |
| 986 | while self._buffer: |
| 987 | data, addr = self._buffer.popleft() |
| 988 | try: |
| 989 | if self._address: |
| 990 | self._sock.send(data) |
| 991 | else: |
| 992 | self._sock.sendto(data, addr) |
Guido van Rossum | 2546a17 | 2013-10-18 10:10:36 -0700 | [diff] [blame] | 993 | except (BlockingIOError, InterruptedError): |
| 994 | self._buffer.appendleft((data, addr)) # Try again later. |
| 995 | break |
Guido van Rossum | 2335de7 | 2013-11-15 16:51:48 -0800 | [diff] [blame] | 996 | except OSError as exc: |
| 997 | self._protocol.error_received(exc) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 998 | return |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 999 | except Exception as exc: |
Victor Stinner | 065ca25 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 1000 | self._fatal_error(exc, |
| 1001 | 'Fatal write error on datagram transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 1002 | return |
| 1003 | |
Guido van Rossum | 355491d | 2013-10-18 15:17:11 -0700 | [diff] [blame] | 1004 | self._maybe_resume_protocol() # May append to buffer. |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 1005 | if not self._buffer: |
| 1006 | self._loop.remove_writer(self._sock_fd) |
| 1007 | if self._closing: |
| 1008 | self._call_connection_lost(None) |