Guido van Rossum | 0039d7b | 1999-01-12 20:19:27 +0000 | [diff] [blame] | 1 | # -*- Mode: Python; tab-width: 4 -*- |
| 2 | # $Id$ |
| 3 | # Author: Sam Rushing <rushing@nightmare.com> |
| 4 | |
| 5 | # ====================================================================== |
| 6 | # Copyright 1996 by Sam Rushing |
| 7 | # |
| 8 | # All Rights Reserved |
| 9 | # |
| 10 | # Permission to use, copy, modify, and distribute this software and |
| 11 | # its documentation for any purpose and without fee is hereby |
| 12 | # granted, provided that the above copyright notice appear in all |
| 13 | # copies and that both that copyright notice and this permission |
| 14 | # notice appear in supporting documentation, and that the name of Sam |
| 15 | # Rushing not be used in advertising or publicity pertaining to |
| 16 | # distribution of the software without specific, written prior |
| 17 | # permission. |
| 18 | # |
| 19 | # SAM RUSHING DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 20 | # INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN |
| 21 | # NO EVENT SHALL SAM RUSHING BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 22 | # CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS |
| 23 | # OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, |
| 24 | # NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 25 | # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 26 | # ====================================================================== |
| 27 | |
| 28 | import select |
| 29 | import socket |
| 30 | import string |
| 31 | import sys |
| 32 | |
| 33 | import os |
| 34 | if os.name == 'nt': |
| 35 | EWOULDBLOCK = 10035 |
| 36 | EINPROGRESS = 10036 |
| 37 | EALREADY = 10037 |
| 38 | ECONNRESET = 10054 |
| 39 | ENOTCONN = 10057 |
| 40 | else: |
| 41 | from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, ENOTCONN |
| 42 | |
| 43 | socket_map = {} |
| 44 | |
| 45 | def poll (timeout=0.0, ignore_expt=1): |
| 46 | if socket_map: |
| 47 | sockets = socket_map.keys() |
| 48 | r = filter (lambda x: x.readable(), sockets) |
| 49 | w = filter (lambda x: x.writable(), sockets) |
| 50 | if ignore_expt: |
| 51 | e = [] |
| 52 | else: |
| 53 | e = sockets[:] |
| 54 | |
| 55 | (r,w,e) = select.select (r,w,e, timeout) |
| 56 | |
| 57 | for x in e: |
| 58 | try: |
| 59 | x.handle_expt_event() |
| 60 | except: |
| 61 | x.handle_error (sys.exc_type, sys.exc_value, sys.exc_traceback) |
| 62 | for x in r: |
| 63 | try: |
| 64 | x.handle_read_event() |
| 65 | except: |
| 66 | x.handle_error (sys.exc_type, sys.exc_value, sys.exc_traceback) |
| 67 | for x in w: |
| 68 | try: |
| 69 | x.handle_write_event() |
| 70 | except: |
| 71 | x.handle_error (sys.exc_type, sys.exc_value, sys.exc_traceback) |
| 72 | |
| 73 | def poll2 (timeout=0.0): |
| 74 | import poll |
| 75 | # timeout is in milliseconds |
| 76 | timeout = int(timeout*1000) |
| 77 | if socket_map: |
| 78 | fd_map = {} |
| 79 | for s in socket_map.keys(): |
| 80 | fd_map[s.fileno()] = s |
| 81 | l = [] |
| 82 | for fd, s in fd_map.items(): |
| 83 | flags = 0 |
| 84 | if s.readable(): |
| 85 | flags = poll.POLLIN |
| 86 | if s.writable(): |
| 87 | flags = flags | poll.POLLOUT |
| 88 | if flags: |
| 89 | l.append (fd, flags) |
| 90 | r = poll.poll (l, timeout) |
| 91 | print r |
| 92 | for fd, flags in r: |
| 93 | s = fd_map[fd] |
| 94 | try: |
| 95 | if (flags & poll.POLLIN): |
| 96 | s.handle_read_event() |
| 97 | if (flags & poll.POLLOUT): |
| 98 | s.handle_write_event() |
| 99 | if (flags & poll.POLLERR): |
| 100 | s.handle_expt_event() |
| 101 | except: |
| 102 | apply (s.handle_error, sys.exc_info()) |
| 103 | |
| 104 | |
| 105 | def loop (timeout=30.0, use_poll=0): |
| 106 | |
| 107 | if use_poll: |
| 108 | poll_fun = poll2 |
| 109 | else: |
| 110 | poll_fun = poll |
| 111 | |
| 112 | while socket_map: |
| 113 | poll_fun (timeout) |
| 114 | |
| 115 | class dispatcher: |
| 116 | debug = 0 |
| 117 | connected = 0 |
| 118 | accepting = 0 |
| 119 | closing = 0 |
| 120 | addr = None |
| 121 | |
| 122 | def __init__ (self, sock=None): |
| 123 | if sock: |
| 124 | self.set_socket (sock) |
| 125 | # I think it should inherit this anyway |
| 126 | self.socket.setblocking (0) |
| 127 | self.connected = 1 |
| 128 | |
| 129 | def __repr__ (self): |
| 130 | try: |
| 131 | status = [] |
| 132 | if self.accepting and self.addr: |
| 133 | status.append ('listening') |
| 134 | elif self.connected: |
| 135 | status.append ('connected') |
| 136 | if self.addr: |
| 137 | status.append ('%s:%d' % self.addr) |
| 138 | return '<%s %s at %x>' % ( |
| 139 | self.__class__.__name__, |
| 140 | string.join (status, ' '), |
| 141 | id(self) |
| 142 | ) |
| 143 | except: |
| 144 | try: |
| 145 | ar = repr(self.addr) |
| 146 | except: |
| 147 | ar = 'no self.addr!' |
| 148 | |
| 149 | return '<__repr__ (self) failed for object at %x (addr=%s)>' % (id(self),ar) |
| 150 | |
| 151 | def add_channel (self): |
| 152 | self.log ('adding channel %s' % self) |
| 153 | socket_map [self] = 1 |
| 154 | |
| 155 | def del_channel (self): |
| 156 | if socket_map.has_key (self): |
| 157 | self.log ('closing channel %d:%s' % (self.fileno(), self)) |
| 158 | del socket_map [self] |
| 159 | |
| 160 | def create_socket (self, family, type): |
| 161 | self.family_and_type = family, type |
| 162 | self.socket = socket.socket (family, type) |
| 163 | self.socket.setblocking(0) |
| 164 | self.add_channel() |
| 165 | |
| 166 | def set_socket (self, socket): |
| 167 | self.socket = socket |
| 168 | self.add_channel() |
| 169 | |
| 170 | def set_reuse_addr (self): |
| 171 | # try to re-use a server port if possible |
| 172 | try: |
| 173 | self.socket.setsockopt ( |
| 174 | socket.SOL_SOCKET, socket.SO_REUSEADDR, |
| 175 | self.socket.getsockopt (socket.SOL_SOCKET, socket.SO_REUSEADDR) | 1 |
| 176 | ) |
| 177 | except: |
| 178 | pass |
| 179 | |
| 180 | # ================================================== |
| 181 | # predicates for select() |
| 182 | # these are used as filters for the lists of sockets |
| 183 | # to pass to select(). |
| 184 | # ================================================== |
| 185 | |
| 186 | def readable (self): |
| 187 | return 1 |
| 188 | |
| 189 | if os.name == 'mac': |
| 190 | # The macintosh will select a listening socket for |
| 191 | # write if you let it. What might this mean? |
| 192 | def writable (self): |
| 193 | return not self.accepting |
| 194 | else: |
| 195 | def writable (self): |
| 196 | return 1 |
| 197 | |
| 198 | # ================================================== |
| 199 | # socket object methods. |
| 200 | # ================================================== |
| 201 | |
| 202 | def listen (self, num): |
| 203 | self.accepting = 1 |
| 204 | if os.name == 'nt' and num > 5: |
| 205 | num = 1 |
| 206 | return self.socket.listen (num) |
| 207 | |
| 208 | def bind (self, addr): |
| 209 | self.addr = addr |
| 210 | return self.socket.bind (addr) |
| 211 | |
| 212 | def connect (self, address): |
| 213 | try: |
| 214 | self.socket.connect (address) |
| 215 | except socket.error, why: |
| 216 | if why[0] in (EINPROGRESS, EALREADY, EWOULDBLOCK): |
| 217 | return |
| 218 | else: |
| 219 | raise socket.error, why |
| 220 | self.connected = 1 |
| 221 | self.handle_connect() |
| 222 | |
| 223 | def accept (self): |
| 224 | try: |
| 225 | conn, addr = self.socket.accept() |
| 226 | return conn, addr |
| 227 | except socket.error, why: |
| 228 | if why[0] == EWOULDBLOCK: |
| 229 | pass |
| 230 | else: |
| 231 | raise socket.error, why |
| 232 | |
| 233 | def send (self, data): |
| 234 | try: |
| 235 | result = self.socket.send (data) |
| 236 | return result |
| 237 | except socket.error, why: |
| 238 | if why[0] == EWOULDBLOCK: |
| 239 | return 0 |
| 240 | else: |
| 241 | raise socket.error, why |
| 242 | return 0 |
| 243 | |
| 244 | def recv (self, buffer_size): |
| 245 | try: |
| 246 | data = self.socket.recv (buffer_size) |
| 247 | if not data: |
| 248 | # a closed connection is indicated by signaling |
| 249 | # a read condition, and having recv() return 0. |
| 250 | self.handle_close() |
| 251 | return '' |
| 252 | else: |
| 253 | return data |
| 254 | except socket.error, why: |
| 255 | # winsock sometimes throws ENOTCONN |
| 256 | if why[0] in [ECONNRESET, ENOTCONN]: |
| 257 | self.handle_close() |
| 258 | return '' |
| 259 | else: |
| 260 | raise socket.error, why |
| 261 | |
| 262 | def close (self): |
| 263 | self.del_channel() |
| 264 | self.socket.close() |
| 265 | self.connected = 0 |
| 266 | |
| 267 | # cheap inheritance, used to pass all other attribute |
| 268 | # references to the underlying socket object. |
| 269 | def __getattr__ (self, attr): |
| 270 | if attr != 'socket': |
| 271 | return getattr (self.socket, attr) |
| 272 | else: |
| 273 | raise AttributeError, attr |
| 274 | |
| 275 | def log (self, message): |
| 276 | print 'log:', message |
| 277 | |
| 278 | def handle_read_event (self): |
| 279 | if self.accepting: |
| 280 | # for an accepting socket, getting a read implies |
| 281 | # that we are connected |
| 282 | if not self.connected: |
| 283 | self.connected = 1 |
| 284 | self.handle_accept() |
| 285 | elif not self.connected: |
| 286 | self.handle_connect() |
| 287 | self.connected = 1 |
| 288 | self.handle_read() |
| 289 | else: |
| 290 | self.handle_read() |
| 291 | |
| 292 | def handle_write_event (self): |
| 293 | # getting a write implies that we are connected |
| 294 | if not self.connected: |
| 295 | self.handle_connect() |
| 296 | self.connected = 1 |
| 297 | self.handle_write() |
| 298 | |
| 299 | def handle_expt_event (self): |
| 300 | self.handle_expt() |
| 301 | |
| 302 | def handle_error (self, *info): |
| 303 | (t,v,tb) = info |
| 304 | (file,fun,line), tbinfo = compact_traceback (t,v,tb) |
| 305 | |
| 306 | # sometimes a user repr method will crash. |
| 307 | try: |
| 308 | self_repr = repr (self) |
| 309 | except: |
| 310 | self_repr = '<__repr__ (self) failed for object at %0x>' % id(self) |
| 311 | |
| 312 | print ( |
| 313 | 'uncaptured python exception, closing channel %s (%s:%s %s)' % ( |
| 314 | self_repr, |
| 315 | str(t), |
| 316 | str(v), |
| 317 | tbinfo |
| 318 | ) |
| 319 | ) |
| 320 | del t,v,tb |
| 321 | self.close() |
| 322 | |
| 323 | def handle_expt (self): |
| 324 | self.log ('unhandled exception') |
| 325 | |
| 326 | def handle_read (self): |
| 327 | self.log ('unhandled read event') |
| 328 | |
| 329 | def handle_write (self): |
| 330 | self.log ('unhandled write event') |
| 331 | |
| 332 | def handle_connect (self): |
| 333 | self.log ('unhandled connect event') |
| 334 | |
| 335 | def handle_oob (self): |
| 336 | self.log ('unhandled out-of-band event') |
| 337 | |
| 338 | def handle_accept (self): |
| 339 | self.log ('unhandled accept event') |
| 340 | |
| 341 | def handle_close (self): |
| 342 | self.log ('unhandled close event') |
| 343 | self.close() |
| 344 | |
| 345 | # --------------------------------------------------------------------------- |
| 346 | # adds simple buffered output capability, useful for simple clients. |
| 347 | # [for more sophisticated usage use asynchat.async_chat] |
| 348 | # --------------------------------------------------------------------------- |
| 349 | |
| 350 | class dispatcher_with_send (dispatcher): |
| 351 | def __init__ (self, sock=None): |
| 352 | dispatcher.__init__ (self, sock) |
| 353 | self.out_buffer = '' |
| 354 | |
| 355 | def initiate_send (self): |
| 356 | num_sent = 0 |
| 357 | num_sent = dispatcher.send (self, self.out_buffer[:512]) |
| 358 | self.out_buffer = self.out_buffer[num_sent:] |
| 359 | |
| 360 | def handle_write (self): |
| 361 | self.initiate_send() |
| 362 | |
| 363 | def writable (self): |
| 364 | return (not self.connected) or len(self.out_buffer) |
| 365 | |
| 366 | def send (self, data): |
| 367 | if self.debug: |
| 368 | self.log ('sending %s' % repr(data)) |
| 369 | self.out_buffer = self.out_buffer + data |
| 370 | self.initiate_send() |
| 371 | |
| 372 | # --------------------------------------------------------------------------- |
| 373 | # used for debugging. |
| 374 | # --------------------------------------------------------------------------- |
| 375 | |
| 376 | def compact_traceback (t,v,tb): |
| 377 | tbinfo = [] |
| 378 | while 1: |
| 379 | tbinfo.append ( |
| 380 | tb.tb_frame.f_code.co_filename, |
| 381 | tb.tb_frame.f_code.co_name, |
| 382 | str(tb.tb_lineno) |
| 383 | ) |
| 384 | tb = tb.tb_next |
| 385 | if not tb: |
| 386 | break |
| 387 | |
| 388 | file, function, line = tbinfo[-1] |
| 389 | info = '[' + string.join ( |
| 390 | map ( |
| 391 | lambda x: string.join (x, '|'), |
| 392 | tbinfo |
| 393 | ), |
| 394 | '] [' |
| 395 | ) + ']' |
| 396 | return (file, function, line), info |
| 397 | |
| 398 | def close_all (): |
| 399 | global socket_map |
| 400 | for x in socket_map.keys(): |
| 401 | x.socket.close() |
| 402 | socket_map.clear() |
| 403 | |
| 404 | # Asynchronous File I/O: |
| 405 | # |
| 406 | # After a little research (reading man pages on various unixen, and |
| 407 | # digging through the linux kernel), I've determined that select() |
| 408 | # isn't meant for doing doing asynchronous file i/o. |
| 409 | # Heartening, though - reading linux/mm/filemap.c shows that linux |
| 410 | # supports asynchronous read-ahead. So _MOST_ of the time, the data |
| 411 | # will be sitting in memory for us already when we go to read it. |
| 412 | # |
| 413 | # What other OS's (besides NT) support async file i/o? [VMS?] |
| 414 | # |
| 415 | # Regardless, this is useful for pipes, and stdin/stdout... |
| 416 | |
| 417 | import os |
| 418 | if os.name == 'posix': |
| 419 | import fcntl |
| 420 | import FCNTL |
| 421 | |
| 422 | class file_wrapper: |
| 423 | # here we override just enough to make a file |
| 424 | # look like a socket for the purposes of asyncore. |
| 425 | def __init__ (self, fd): |
| 426 | self.fd = fd |
| 427 | |
| 428 | def recv (self, *args): |
| 429 | return apply (os.read, (self.fd,)+args) |
| 430 | |
| 431 | def write (self, *args): |
| 432 | return apply (os.write, (self.fd,)+args) |
| 433 | |
| 434 | def close (self): |
| 435 | return os.close (self.fd) |
| 436 | |
| 437 | def fileno (self): |
| 438 | return self.fd |
| 439 | |
| 440 | class file_dispatcher (dispatcher): |
| 441 | def __init__ (self, fd): |
| 442 | dispatcher.__init__ (self) |
| 443 | self.connected = 1 |
| 444 | # set it to non-blocking mode |
| 445 | flags = fcntl.fcntl (fd, FCNTL.F_GETFL, 0) |
| 446 | flags = flags | FCNTL.O_NONBLOCK |
| 447 | fcntl.fcntl (fd, FCNTL.F_SETFL, flags) |
| 448 | self.set_file (fd) |
| 449 | |
| 450 | def set_file (self, fd): |
| 451 | self.socket = file_wrapper (fd) |
| 452 | self.add_channel() |
| 453 | #not really |