Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 1 | """Event loop using a proactor and related classes. |
| 2 | |
| 3 | A proactor is a "notify-on-completion" multiplexer. Currently a |
| 4 | proactor is only implemented on Windows with IOCP. |
| 5 | """ |
| 6 | |
Victor Stinner | 8dffc45 | 2014-01-25 15:32:06 +0100 | [diff] [blame] | 7 | __all__ = ['BaseProactorEventLoop'] |
| 8 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 9 | import socket |
| 10 | |
| 11 | from . import base_events |
| 12 | from . import constants |
| 13 | from . import futures |
| 14 | from . import transports |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 15 | from .log import logger |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 16 | |
| 17 | |
Yury Selivanov | 3cb9914 | 2014-02-18 18:41:13 -0500 | [diff] [blame] | 18 | class _ProactorBasePipeTransport(transports._FlowControlMixin, |
| 19 | transports.BaseTransport): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 20 | """Base class for pipe and socket transports.""" |
| 21 | |
| 22 | def __init__(self, loop, sock, protocol, waiter=None, |
| 23 | extra=None, server=None): |
| 24 | super().__init__(extra) |
| 25 | self._set_extra(sock) |
| 26 | self._loop = loop |
| 27 | self._sock = sock |
| 28 | self._protocol = protocol |
| 29 | self._server = server |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 30 | self._buffer = None # None or bytearray. |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 31 | self._read_fut = None |
| 32 | self._write_fut = None |
Victor Stinner | 915bcb0 | 2014-02-01 22:49:59 +0100 | [diff] [blame] | 33 | self._pending_write = 0 |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 34 | self._conn_lost = 0 |
| 35 | self._closing = False # Set when close() called. |
| 36 | self._eof_written = False |
| 37 | if self._server is not None: |
| 38 | self._server.attach(self) |
| 39 | self._loop.call_soon(self._protocol.connection_made, self) |
| 40 | if waiter is not None: |
| 41 | self._loop.call_soon(waiter.set_result, None) |
| 42 | |
| 43 | def _set_extra(self, sock): |
| 44 | self._extra['pipe'] = sock |
| 45 | |
| 46 | def close(self): |
| 47 | if self._closing: |
| 48 | return |
| 49 | self._closing = True |
| 50 | self._conn_lost += 1 |
| 51 | if not self._buffer and self._write_fut is None: |
| 52 | self._loop.call_soon(self._call_connection_lost, None) |
| 53 | if self._read_fut is not None: |
| 54 | self._read_fut.cancel() |
| 55 | |
Victor Stinner | 0ee29c2 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 56 | def _fatal_error(self, exc, message='Fatal error on pipe transport'): |
Victor Stinner | 63b4d4b | 2014-01-29 13:12:03 -0800 | [diff] [blame] | 57 | if not isinstance(exc, (BrokenPipeError, ConnectionResetError)): |
Yury Selivanov | 569efa2 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 58 | self._loop.call_exception_handler({ |
Victor Stinner | 0ee29c2 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 59 | 'message': message, |
Yury Selivanov | 569efa2 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 60 | 'exception': exc, |
| 61 | 'transport': self, |
| 62 | 'protocol': self._protocol, |
| 63 | }) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 64 | self._force_close(exc) |
| 65 | |
| 66 | def _force_close(self, exc): |
| 67 | if self._closing: |
| 68 | return |
| 69 | self._closing = True |
| 70 | self._conn_lost += 1 |
| 71 | if self._write_fut: |
| 72 | self._write_fut.cancel() |
| 73 | if self._read_fut: |
| 74 | self._read_fut.cancel() |
| 75 | self._write_fut = self._read_fut = None |
Victor Stinner | 915bcb0 | 2014-02-01 22:49:59 +0100 | [diff] [blame] | 76 | self._pending_write = 0 |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 77 | self._buffer = None |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 78 | self._loop.call_soon(self._call_connection_lost, exc) |
| 79 | |
| 80 | def _call_connection_lost(self, exc): |
| 81 | try: |
| 82 | self._protocol.connection_lost(exc) |
| 83 | finally: |
| 84 | # XXX If there is a pending overlapped read on the other |
| 85 | # end then it may fail with ERROR_NETNAME_DELETED if we |
| 86 | # just close our end. First calling shutdown() seems to |
| 87 | # cure it, but maybe using DisconnectEx() would be better. |
| 88 | if hasattr(self._sock, 'shutdown'): |
| 89 | self._sock.shutdown(socket.SHUT_RDWR) |
| 90 | self._sock.close() |
| 91 | server = self._server |
| 92 | if server is not None: |
| 93 | server.detach(self) |
| 94 | self._server = None |
| 95 | |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 96 | def get_write_buffer_size(self): |
Victor Stinner | 915bcb0 | 2014-02-01 22:49:59 +0100 | [diff] [blame] | 97 | size = self._pending_write |
| 98 | if self._buffer is not None: |
| 99 | size += len(self._buffer) |
| 100 | return size |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 101 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 102 | |
| 103 | class _ProactorReadPipeTransport(_ProactorBasePipeTransport, |
| 104 | transports.ReadTransport): |
| 105 | """Transport for read pipes.""" |
| 106 | |
| 107 | def __init__(self, loop, sock, protocol, waiter=None, |
| 108 | extra=None, server=None): |
| 109 | super().__init__(loop, sock, protocol, waiter, extra, server) |
| 110 | self._read_fut = None |
| 111 | self._paused = False |
| 112 | self._loop.call_soon(self._loop_reading) |
| 113 | |
Guido van Rossum | 57497ad | 2013-10-18 07:58:20 -0700 | [diff] [blame] | 114 | def pause_reading(self): |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 115 | if self._closing: |
| 116 | raise RuntimeError('Cannot pause_reading() when closing') |
| 117 | if self._paused: |
| 118 | raise RuntimeError('Already paused') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 119 | self._paused = True |
| 120 | |
Guido van Rossum | 57497ad | 2013-10-18 07:58:20 -0700 | [diff] [blame] | 121 | def resume_reading(self): |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 122 | if not self._paused: |
| 123 | raise RuntimeError('Not paused') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 124 | self._paused = False |
| 125 | if self._closing: |
| 126 | return |
| 127 | self._loop.call_soon(self._loop_reading, self._read_fut) |
| 128 | |
| 129 | def _loop_reading(self, fut=None): |
| 130 | if self._paused: |
| 131 | return |
| 132 | data = None |
| 133 | |
| 134 | try: |
| 135 | if fut is not None: |
| 136 | assert self._read_fut is fut or (self._read_fut is None and |
| 137 | self._closing) |
| 138 | self._read_fut = None |
| 139 | data = fut.result() # deliver data later in "finally" clause |
| 140 | |
| 141 | if self._closing: |
| 142 | # since close() has been called we ignore any read data |
| 143 | data = None |
| 144 | return |
| 145 | |
| 146 | if data == b'': |
| 147 | # we got end-of-file so no need to reschedule a new read |
| 148 | return |
| 149 | |
| 150 | # reschedule a new read |
| 151 | self._read_fut = self._loop._proactor.recv(self._sock, 4096) |
| 152 | except ConnectionAbortedError as exc: |
| 153 | if not self._closing: |
Victor Stinner | 0ee29c2 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 154 | self._fatal_error(exc, 'Fatal read error on pipe transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 155 | except ConnectionResetError as exc: |
| 156 | self._force_close(exc) |
| 157 | except OSError as exc: |
Victor Stinner | 0ee29c2 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 158 | self._fatal_error(exc, 'Fatal read error on pipe transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 159 | except futures.CancelledError: |
| 160 | if not self._closing: |
| 161 | raise |
| 162 | else: |
| 163 | self._read_fut.add_done_callback(self._loop_reading) |
| 164 | finally: |
| 165 | if data: |
| 166 | self._protocol.data_received(data) |
| 167 | elif data is not None: |
| 168 | keep_open = self._protocol.eof_received() |
| 169 | if not keep_open: |
| 170 | self.close() |
| 171 | |
| 172 | |
Victor Stinner | b60e9ca | 2014-01-31 14:18:18 +0100 | [diff] [blame] | 173 | class _ProactorBaseWritePipeTransport(_ProactorBasePipeTransport, |
Victor Stinner | 915bcb0 | 2014-02-01 22:49:59 +0100 | [diff] [blame] | 174 | transports.WriteTransport): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 175 | """Transport for write pipes.""" |
| 176 | |
| 177 | def write(self, data): |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 178 | if not isinstance(data, (bytes, bytearray, memoryview)): |
| 179 | raise TypeError('data argument must be byte-ish (%r)', |
| 180 | type(data)) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 181 | if self._eof_written: |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 182 | raise RuntimeError('write_eof() already called') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 183 | |
| 184 | if not data: |
| 185 | return |
| 186 | |
| 187 | if self._conn_lost: |
| 188 | if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES: |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 189 | logger.warning('socket.send() raised exception.') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 190 | self._conn_lost += 1 |
| 191 | return |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 192 | |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 193 | # Observable states: |
| 194 | # 1. IDLE: _write_fut and _buffer both None |
| 195 | # 2. WRITING: _write_fut set; _buffer None |
| 196 | # 3. BACKED UP: _write_fut set; _buffer a bytearray |
| 197 | # We always copy the data, so the caller can't modify it |
| 198 | # while we're still waiting for the I/O to happen. |
| 199 | if self._write_fut is None: # IDLE -> WRITING |
| 200 | assert self._buffer is None |
| 201 | # Pass a copy, except if it's already immutable. |
| 202 | self._loop_writing(data=bytes(data)) |
| 203 | # XXX Should we pause the protocol at this point |
| 204 | # if len(data) > self._high_water? (That would |
| 205 | # require keeping track of the number of bytes passed |
| 206 | # to a send() that hasn't finished yet.) |
| 207 | elif not self._buffer: # WRITING -> BACKED UP |
| 208 | # Make a mutable copy which we can extend. |
| 209 | self._buffer = bytearray(data) |
| 210 | self._maybe_pause_protocol() |
| 211 | else: # BACKED UP |
| 212 | # Append to buffer (also copies). |
| 213 | self._buffer.extend(data) |
| 214 | self._maybe_pause_protocol() |
| 215 | |
| 216 | def _loop_writing(self, f=None, data=None): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 217 | try: |
| 218 | assert f is self._write_fut |
| 219 | self._write_fut = None |
Victor Stinner | 915bcb0 | 2014-02-01 22:49:59 +0100 | [diff] [blame] | 220 | self._pending_write = 0 |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 221 | if f: |
| 222 | f.result() |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 223 | if data is None: |
| 224 | data = self._buffer |
| 225 | self._buffer = None |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 226 | if not data: |
| 227 | if self._closing: |
| 228 | self._loop.call_soon(self._call_connection_lost, None) |
| 229 | if self._eof_written: |
| 230 | self._sock.shutdown(socket.SHUT_WR) |
Victor Stinner | 915bcb0 | 2014-02-01 22:49:59 +0100 | [diff] [blame] | 231 | # Now that we've reduced the buffer size, tell the |
| 232 | # protocol to resume writing if it was paused. Note that |
| 233 | # we do this last since the callback is called immediately |
| 234 | # and it may add more data to the buffer (even causing the |
| 235 | # protocol to be paused again). |
| 236 | self._maybe_resume_protocol() |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 237 | else: |
| 238 | self._write_fut = self._loop._proactor.send(self._sock, data) |
Victor Stinner | 915bcb0 | 2014-02-01 22:49:59 +0100 | [diff] [blame] | 239 | if not self._write_fut.done(): |
| 240 | assert self._pending_write == 0 |
| 241 | self._pending_write = len(data) |
| 242 | self._write_fut.add_done_callback(self._loop_writing) |
| 243 | self._maybe_pause_protocol() |
| 244 | else: |
| 245 | self._write_fut.add_done_callback(self._loop_writing) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 246 | except ConnectionResetError as exc: |
| 247 | self._force_close(exc) |
| 248 | except OSError as exc: |
Victor Stinner | 0ee29c2 | 2014-02-19 01:40:41 +0100 | [diff] [blame] | 249 | self._fatal_error(exc, 'Fatal write error on pipe transport') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 250 | |
| 251 | def can_write_eof(self): |
| 252 | return True |
| 253 | |
| 254 | def write_eof(self): |
| 255 | self.close() |
| 256 | |
| 257 | def abort(self): |
| 258 | self._force_close(None) |
| 259 | |
| 260 | |
Victor Stinner | b60e9ca | 2014-01-31 14:18:18 +0100 | [diff] [blame] | 261 | class _ProactorWritePipeTransport(_ProactorBaseWritePipeTransport): |
| 262 | def __init__(self, *args, **kw): |
| 263 | super().__init__(*args, **kw) |
| 264 | self._read_fut = self._loop._proactor.recv(self._sock, 16) |
| 265 | self._read_fut.add_done_callback(self._pipe_closed) |
| 266 | |
| 267 | def _pipe_closed(self, fut): |
| 268 | if fut.cancelled(): |
| 269 | # the transport has been closed |
| 270 | return |
Victor Stinner | 83bdfa0 | 2014-02-04 08:57:48 +0100 | [diff] [blame] | 271 | assert fut.result() == b'' |
| 272 | if self._closing: |
| 273 | assert self._read_fut is None |
| 274 | return |
Victor Stinner | b60e9ca | 2014-01-31 14:18:18 +0100 | [diff] [blame] | 275 | assert fut is self._read_fut, (fut, self._read_fut) |
| 276 | self._read_fut = None |
Victor Stinner | b60e9ca | 2014-01-31 14:18:18 +0100 | [diff] [blame] | 277 | if self._write_fut is not None: |
Victor Stinner | 6f24d83 | 2014-02-20 10:33:01 +0100 | [diff] [blame] | 278 | self._force_close(BrokenPipeError()) |
Victor Stinner | b60e9ca | 2014-01-31 14:18:18 +0100 | [diff] [blame] | 279 | else: |
| 280 | self.close() |
| 281 | |
| 282 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 283 | class _ProactorDuplexPipeTransport(_ProactorReadPipeTransport, |
Victor Stinner | b60e9ca | 2014-01-31 14:18:18 +0100 | [diff] [blame] | 284 | _ProactorBaseWritePipeTransport, |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 285 | transports.Transport): |
| 286 | """Transport for duplex pipes.""" |
| 287 | |
| 288 | def can_write_eof(self): |
| 289 | return False |
| 290 | |
| 291 | def write_eof(self): |
| 292 | raise NotImplementedError |
| 293 | |
| 294 | |
| 295 | class _ProactorSocketTransport(_ProactorReadPipeTransport, |
Victor Stinner | b60e9ca | 2014-01-31 14:18:18 +0100 | [diff] [blame] | 296 | _ProactorBaseWritePipeTransport, |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 297 | transports.Transport): |
| 298 | """Transport for connected sockets.""" |
| 299 | |
| 300 | def _set_extra(self, sock): |
| 301 | self._extra['socket'] = sock |
| 302 | try: |
| 303 | self._extra['sockname'] = sock.getsockname() |
| 304 | except (socket.error, AttributeError): |
| 305 | pass |
| 306 | if 'peername' not in self._extra: |
| 307 | try: |
| 308 | self._extra['peername'] = sock.getpeername() |
| 309 | except (socket.error, AttributeError): |
| 310 | pass |
| 311 | |
| 312 | def can_write_eof(self): |
| 313 | return True |
| 314 | |
| 315 | def write_eof(self): |
| 316 | if self._closing or self._eof_written: |
| 317 | return |
| 318 | self._eof_written = True |
| 319 | if self._write_fut is None: |
| 320 | self._sock.shutdown(socket.SHUT_WR) |
| 321 | |
| 322 | |
| 323 | class BaseProactorEventLoop(base_events.BaseEventLoop): |
| 324 | |
| 325 | def __init__(self, proactor): |
| 326 | super().__init__() |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 327 | logger.debug('Using proactor: %s', proactor.__class__.__name__) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 328 | self._proactor = proactor |
| 329 | self._selector = proactor # convenient alias |
Victor Stinner | 7de2646 | 2014-01-11 00:03:21 +0100 | [diff] [blame] | 330 | self._self_reading_future = None |
| 331 | self._accept_futures = {} # socket file descriptor => Future |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 332 | proactor.set_loop(self) |
| 333 | self._make_self_pipe() |
| 334 | |
| 335 | def _make_socket_transport(self, sock, protocol, waiter=None, |
| 336 | extra=None, server=None): |
| 337 | return _ProactorSocketTransport(self, sock, protocol, waiter, |
| 338 | extra, server) |
| 339 | |
| 340 | def _make_duplex_pipe_transport(self, sock, protocol, waiter=None, |
| 341 | extra=None): |
| 342 | return _ProactorDuplexPipeTransport(self, |
| 343 | sock, protocol, waiter, extra) |
| 344 | |
| 345 | def _make_read_pipe_transport(self, sock, protocol, waiter=None, |
| 346 | extra=None): |
| 347 | return _ProactorReadPipeTransport(self, sock, protocol, waiter, extra) |
| 348 | |
| 349 | def _make_write_pipe_transport(self, sock, protocol, waiter=None, |
Victor Stinner | b60e9ca | 2014-01-31 14:18:18 +0100 | [diff] [blame] | 350 | extra=None): |
| 351 | # We want connection_lost() to be called when other end closes |
| 352 | return _ProactorWritePipeTransport(self, |
| 353 | sock, protocol, waiter, extra) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 354 | |
| 355 | def close(self): |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 356 | if self.is_closed(): |
| 357 | return |
Victor Stinner | f328c7d | 2014-06-23 01:02:37 +0200 | [diff] [blame^] | 358 | super().close() |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 359 | self._stop_accept_futures() |
| 360 | self._close_self_pipe() |
| 361 | self._proactor.close() |
| 362 | self._proactor = None |
| 363 | self._selector = None |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 364 | |
| 365 | def sock_recv(self, sock, n): |
| 366 | return self._proactor.recv(sock, n) |
| 367 | |
| 368 | def sock_sendall(self, sock, data): |
| 369 | return self._proactor.send(sock, data) |
| 370 | |
| 371 | def sock_connect(self, sock, address): |
Victor Stinner | 1b0580b | 2014-02-13 09:24:37 +0100 | [diff] [blame] | 372 | try: |
| 373 | base_events._check_resolved_address(sock, address) |
| 374 | except ValueError as err: |
| 375 | fut = futures.Future(loop=self) |
| 376 | fut.set_exception(err) |
| 377 | return fut |
| 378 | else: |
| 379 | return self._proactor.connect(sock, address) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 380 | |
| 381 | def sock_accept(self, sock): |
| 382 | return self._proactor.accept(sock) |
| 383 | |
| 384 | def _socketpair(self): |
| 385 | raise NotImplementedError |
| 386 | |
| 387 | def _close_self_pipe(self): |
Victor Stinner | 7de2646 | 2014-01-11 00:03:21 +0100 | [diff] [blame] | 388 | if self._self_reading_future is not None: |
| 389 | self._self_reading_future.cancel() |
| 390 | self._self_reading_future = None |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 391 | self._ssock.close() |
| 392 | self._ssock = None |
| 393 | self._csock.close() |
| 394 | self._csock = None |
| 395 | self._internal_fds -= 1 |
| 396 | |
| 397 | def _make_self_pipe(self): |
| 398 | # A self-socket, really. :-) |
| 399 | self._ssock, self._csock = self._socketpair() |
| 400 | self._ssock.setblocking(False) |
| 401 | self._csock.setblocking(False) |
| 402 | self._internal_fds += 1 |
| 403 | self.call_soon(self._loop_self_reading) |
| 404 | |
| 405 | def _loop_self_reading(self, f=None): |
| 406 | try: |
| 407 | if f is not None: |
| 408 | f.result() # may raise |
| 409 | f = self._proactor.recv(self._ssock, 4096) |
| 410 | except: |
| 411 | self.close() |
| 412 | raise |
| 413 | else: |
Victor Stinner | 7de2646 | 2014-01-11 00:03:21 +0100 | [diff] [blame] | 414 | self._self_reading_future = f |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 415 | f.add_done_callback(self._loop_self_reading) |
| 416 | |
| 417 | def _write_to_self(self): |
| 418 | self._csock.send(b'x') |
| 419 | |
| 420 | def _start_serving(self, protocol_factory, sock, ssl=None, server=None): |
Guido van Rossum | ebb8e58 | 2013-12-04 12:12:07 -0800 | [diff] [blame] | 421 | if ssl: |
| 422 | raise ValueError('IocpEventLoop is incompatible with SSL.') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 423 | |
| 424 | def loop(f=None): |
| 425 | try: |
| 426 | if f is not None: |
| 427 | conn, addr = f.result() |
| 428 | protocol = protocol_factory() |
| 429 | self._make_socket_transport( |
| 430 | conn, protocol, |
| 431 | extra={'peername': addr}, server=server) |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 432 | if self.is_closed(): |
| 433 | return |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 434 | f = self._proactor.accept(sock) |
Yury Selivanov | 569efa2 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 435 | except OSError as exc: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 436 | if sock.fileno() != -1: |
Yury Selivanov | 569efa2 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 437 | self.call_exception_handler({ |
| 438 | 'message': 'Accept failed', |
| 439 | 'exception': exc, |
| 440 | 'socket': sock, |
| 441 | }) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 442 | sock.close() |
| 443 | except futures.CancelledError: |
| 444 | sock.close() |
| 445 | else: |
Victor Stinner | 7de2646 | 2014-01-11 00:03:21 +0100 | [diff] [blame] | 446 | self._accept_futures[sock.fileno()] = f |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 447 | f.add_done_callback(loop) |
| 448 | |
| 449 | self.call_soon(loop) |
| 450 | |
| 451 | def _process_events(self, event_list): |
| 452 | pass # XXX hard work currently done in poll |
| 453 | |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 454 | def _stop_accept_futures(self): |
Victor Stinner | 7de2646 | 2014-01-11 00:03:21 +0100 | [diff] [blame] | 455 | for future in self._accept_futures.values(): |
| 456 | future.cancel() |
Victor Stinner | bb2fc5b | 2014-06-10 10:23:10 +0200 | [diff] [blame] | 457 | self._accept_futures.clear() |
| 458 | |
| 459 | def _stop_serving(self, sock): |
| 460 | self._stop_accept_futures() |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 461 | self._proactor._stop_serving(sock) |
| 462 | sock.close() |