| 1 | # |
| 2 | # Copyright (C) 2004, 2005, 2007 Richard Kettlewell |
| 3 | # |
| 4 | # This program is free software; you can redistribute it and/or modify |
| 5 | # it under the terms of the GNU General Public License as published by |
| 6 | # the Free Software Foundation; either version 2 of the License, or |
| 7 | # (at your option) any later version. |
| 8 | # |
| 9 | # This program is distributed in the hope that it will be useful, but |
| 10 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | # General Public License for more details. |
| 13 | # |
| 14 | # You should have received a copy of the GNU General Public License |
| 15 | # along with this program; if not, write to the Free Software |
| 16 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 17 | # USA |
| 18 | # |
| 19 | |
| 20 | """Python support for DisOrder |
| 21 | |
| 22 | Provides disorder.client, a class for accessing a DisOrder server. |
| 23 | |
| 24 | Example 1: |
| 25 | |
| 26 | #! /usr/bin/env python |
| 27 | import disorder |
| 28 | d = disorder.client() |
| 29 | p = d.playing() |
| 30 | if p: |
| 31 | print p['track'] |
| 32 | |
| 33 | Example 2: |
| 34 | |
| 35 | #! /usr/bin/env python |
| 36 | import disorder |
| 37 | import sys |
| 38 | d = disorder.client() |
| 39 | for path in sys.argv[1:]: |
| 40 | d.play(path) |
| 41 | |
| 42 | See disorder_protocol(5) for details of the communication protocol. |
| 43 | |
| 44 | NB that this code only supports servers configured to use SHA1-based |
| 45 | authentication. If the server demands another hash then it will not be |
| 46 | possible to use this module. |
| 47 | """ |
| 48 | |
| 49 | import re |
| 50 | import string |
| 51 | import os |
| 52 | import pwd |
| 53 | import socket |
| 54 | import binascii |
| 55 | import sha |
| 56 | import sys |
| 57 | import locale |
| 58 | |
| 59 | _configfile = "pkgconfdir/config" |
| 60 | _dbhome = "pkgstatedir" |
| 61 | _userconf = True |
| 62 | |
| 63 | # various regexps we'll use |
| 64 | _ws = re.compile(r"^[ \t\n\r]+") |
| 65 | _squote = re.compile("'(([^\\\\']|\\\\[\\\\\"'n])+)'") |
| 66 | _dquote = re.compile("\"(([^\\\\\"]|\\\\[\\\\\"'n])+)\"") |
| 67 | _unquoted = re.compile("[^\"' \\t\\n\\r][^ \t\n\r]*") |
| 68 | |
| 69 | _response = re.compile("([0-9]{3}) ?(.*)") |
| 70 | |
| 71 | version = "_version_" |
| 72 | |
| 73 | ######################################################################## |
| 74 | # exception classes |
| 75 | |
| 76 | class Error(Exception): |
| 77 | """Base class for DisOrder exceptions.""" |
| 78 | |
| 79 | class _splitError(Error): |
| 80 | # _split failed |
| 81 | def __init__(self, value): |
| 82 | self.value = value |
| 83 | def __str__(self): |
| 84 | return str(self.value) |
| 85 | |
| 86 | class parseError(Error): |
| 87 | """Error parsing the configuration file.""" |
| 88 | def __init__(self, path, line, details): |
| 89 | self.path = path |
| 90 | self.line = line |
| 91 | self.details = details |
| 92 | def __str__(self): |
| 93 | return "%s:%d: %s" % (self.path, self.line, self.details) |
| 94 | |
| 95 | class protocolError(Error): |
| 96 | """DisOrder control protocol error. |
| 97 | |
| 98 | Indicates a mismatch between the client and server's understanding of |
| 99 | the control protocol. |
| 100 | """ |
| 101 | def __init__(self, who, error): |
| 102 | self.who = who |
| 103 | self.error = error |
| 104 | def __str__(self): |
| 105 | return "%s: %s" % (self.who, str(self.error)) |
| 106 | |
| 107 | class operationError(Error): |
| 108 | """DisOrder control protocol error response. |
| 109 | |
| 110 | Indicates that an operation failed (e.g. an attempt to play a |
| 111 | nonexistent track). The connection should still be usable. |
| 112 | """ |
| 113 | def __init__(self, res, details, cmd=None): |
| 114 | self.res_ = int(res) |
| 115 | self.cmd_ = cmd |
| 116 | self.details_ = details |
| 117 | def __str__(self): |
| 118 | """Return the complete response string from the server, with the command |
| 119 | if available. |
| 120 | |
| 121 | Excludes the final newline. |
| 122 | """ |
| 123 | if self.cmd_ is None: |
| 124 | return "%d %s" % (self.res_, self.details_) |
| 125 | else: |
| 126 | return "%d %s [%s]" % (self.res_, self.details_, self.cmd_) |
| 127 | def response(self): |
| 128 | """Return the response code from the server.""" |
| 129 | return self.res_ |
| 130 | def details(self): |
| 131 | """Returns the detail string from the server.""" |
| 132 | return self.details_ |
| 133 | |
| 134 | class communicationError(Error): |
| 135 | """DisOrder control protocol communication error. |
| 136 | |
| 137 | Indicates that communication with the server went wrong, perhaps |
| 138 | because the server was restarted. The caller could report an error to |
| 139 | the user and wait for further user instructions, or even automatically |
| 140 | retry the operation. |
| 141 | """ |
| 142 | def __init__(self, who, error): |
| 143 | self.who = who |
| 144 | self.error = error |
| 145 | def __str__(self): |
| 146 | return "%s: %s" % (self.who, str(self.error)) |
| 147 | |
| 148 | ######################################################################## |
| 149 | # DisOrder-specific text processing |
| 150 | |
| 151 | def _unescape(s): |
| 152 | # Unescape the contents of a string |
| 153 | # |
| 154 | # Arguments: |
| 155 | # |
| 156 | # s -- string to unescape |
| 157 | # |
| 158 | s = re.sub("\\\\n", "\n", s) |
| 159 | s = re.sub("\\\\(.)", "\\1", s) |
| 160 | return s |
| 161 | |
| 162 | def _split(s, *comments): |
| 163 | # Split a string into fields according to the usual Disorder string splitting |
| 164 | # conventions. |
| 165 | # |
| 166 | # Arguments: |
| 167 | # |
| 168 | # s -- string to parse |
| 169 | # comments -- if present, parse comments |
| 170 | # |
| 171 | # Return values: |
| 172 | # |
| 173 | # On success, a list of fields is returned. |
| 174 | # |
| 175 | # On error, disorder.parseError is thrown. |
| 176 | # |
| 177 | fields = [] |
| 178 | while s != "": |
| 179 | # discard comments |
| 180 | if comments and s[0] == '#': |
| 181 | break |
| 182 | # strip spaces |
| 183 | m = _ws.match(s) |
| 184 | if m: |
| 185 | s = s[m.end():] |
| 186 | continue |
| 187 | # pick of quoted fields of both kinds |
| 188 | m = _squote.match(s) |
| 189 | if not m: |
| 190 | m = _dquote.match(s) |
| 191 | if m: |
| 192 | fields.append(_unescape(m.group(1))) |
| 193 | s = s[m.end():] |
| 194 | continue |
| 195 | # and unquoted fields |
| 196 | m = _unquoted.match(s) |
| 197 | if m: |
| 198 | fields.append(m.group(0)) |
| 199 | s = s[m.end():] |
| 200 | continue |
| 201 | # anything left must be in error |
| 202 | if s[0] == '"' or s[0] == '\'': |
| 203 | raise _splitError("invalid quoted string") |
| 204 | else: |
| 205 | raise _splitError("syntax error") |
| 206 | return fields |
| 207 | |
| 208 | def _escape(s): |
| 209 | # Escape the contents of a string |
| 210 | # |
| 211 | # Arguments: |
| 212 | # |
| 213 | # s -- string to escape |
| 214 | # |
| 215 | if re.search("[\\\\\"'\n \t\r]", s) or s == '': |
| 216 | s = re.sub(r'[\\"]', r'\\\g<0>', s) |
| 217 | s = re.sub("\n", r"\\n", s) |
| 218 | return '"' + s + '"' |
| 219 | else: |
| 220 | return s |
| 221 | |
| 222 | def _quote(list): |
| 223 | # Quote a list of values |
| 224 | return ' '.join(map(_escape, list)) |
| 225 | |
| 226 | def _sanitize(s): |
| 227 | # Return the value of s in a form suitable for writing to stderr |
| 228 | return s.encode(locale.nl_langinfo(locale.CODESET), 'replace') |
| 229 | |
| 230 | def _list2dict(l): |
| 231 | # Convert a list of the form [k1, v1, k2, v2, ..., kN, vN] |
| 232 | # to a dictionary {k1:v1, k2:v2, ..., kN:vN} |
| 233 | d = {} |
| 234 | i = iter(l) |
| 235 | try: |
| 236 | while True: |
| 237 | k = i.next() |
| 238 | v = i.next() |
| 239 | d[str(k)] = v |
| 240 | except StopIteration: |
| 241 | pass |
| 242 | return d |
| 243 | |
| 244 | def _queueEntry(s): |
| 245 | # parse a queue entry |
| 246 | return _list2dict(_split(s)) |
| 247 | |
| 248 | ######################################################################## |
| 249 | # The client class |
| 250 | |
| 251 | class client: |
| 252 | """DisOrder client class. |
| 253 | |
| 254 | This class provides access to the DisOrder server either on this |
| 255 | machine or across the internet. |
| 256 | |
| 257 | The server to connect to, and the username and password to use, are |
| 258 | determined from the configuration files as described in 'man |
| 259 | disorder_config'. |
| 260 | |
| 261 | All methods will connect if necessary, as soon as you have a |
| 262 | disorder.client object you can start calling operational methods on |
| 263 | it. |
| 264 | |
| 265 | However if the server is restarted then the next method called on a |
| 266 | connection will throw an exception. This may be considered a bug. |
| 267 | |
| 268 | All methods block until they complete. |
| 269 | |
| 270 | Operation methods raise communicationError if the connection breaks, |
| 271 | protocolError if the response from the server is malformed, or |
| 272 | operationError if the response is valid but indicates that the |
| 273 | operation failed. |
| 274 | """ |
| 275 | |
| 276 | debug_proto = 0x0001 |
| 277 | debug_body = 0x0002 |
| 278 | |
| 279 | def __init__(self): |
| 280 | """Constructor for DisOrder client class. |
| 281 | |
| 282 | The constructor reads the configuration file, but does not connect |
| 283 | to the server. |
| 284 | |
| 285 | If the environment variable DISORDER_PYTHON_DEBUG is set then the |
| 286 | debug flags are initialised to that value. This can be overridden |
| 287 | with the debug() method below. |
| 288 | |
| 289 | The constructor Raises parseError() if the configuration file is not |
| 290 | valid. |
| 291 | """ |
| 292 | pw = pwd.getpwuid(os.getuid()) |
| 293 | self.debugging = int(os.getenv("DISORDER_PYTHON_DEBUG", 0)) |
| 294 | self.config = { 'collections': [], |
| 295 | 'username': pw.pw_name, |
| 296 | 'home': _dbhome } |
| 297 | home = os.getenv("HOME") |
| 298 | if not home: |
| 299 | home = pw.pw_dir |
| 300 | privconf = _configfile + "." + pw.pw_name |
| 301 | passfile = home + os.sep + ".disorder" + os.sep + "passwd" |
| 302 | if os.path.exists(_configfile): |
| 303 | self._readfile(_configfile) |
| 304 | if os.path.exists(privconf): |
| 305 | self._readfile(privconf) |
| 306 | if os.path.exists(passfile) and _userconf: |
| 307 | self._readfile(passfile) |
| 308 | self.state = 'disconnected' |
| 309 | |
| 310 | def debug(self, bits): |
| 311 | """Enable or disable protocol debugging. Debug messages are written |
| 312 | to sys.stderr. |
| 313 | |
| 314 | Arguments: |
| 315 | bits -- bitmap of operations that should generate debug information |
| 316 | |
| 317 | Bitmap values: |
| 318 | debug_proto -- dump control protocol messages (excluding bodies) |
| 319 | debug_body -- dump control protocol message bodies |
| 320 | """ |
| 321 | self.debugging = bits |
| 322 | |
| 323 | def _debug(self, bit, s): |
| 324 | # debug output |
| 325 | if self.debugging & bit: |
| 326 | sys.stderr.write(_sanitize(s)) |
| 327 | sys.stderr.write("\n") |
| 328 | sys.stderr.flush() |
| 329 | |
| 330 | def connect(self): |
| 331 | """Connect to the DisOrder server and authenticate. |
| 332 | |
| 333 | Raises communicationError if connection fails and operationError if |
| 334 | authentication fails (in which case disconnection is automatic). |
| 335 | |
| 336 | May be called more than once to retry connections (e.g. when the |
| 337 | server is down). If we are already connected and authenticated, |
| 338 | this is a no-op. |
| 339 | |
| 340 | Other operations automatically connect if we're not already |
| 341 | connected, so it is not strictly necessary to call this method. |
| 342 | """ |
| 343 | if self.state == 'disconnected': |
| 344 | try: |
| 345 | self.state = 'connecting' |
| 346 | if 'connect' in self.config and len(self.config['connect']) > 0: |
| 347 | c = self.config['connect'] |
| 348 | self.who = repr(c) # temporarily |
| 349 | if len(c) == 1: |
| 350 | a = socket.getaddrinfo(None, c[0], |
| 351 | socket.AF_INET, |
| 352 | socket.SOCK_STREAM, |
| 353 | 0, |
| 354 | 0) |
| 355 | else: |
| 356 | a = socket.getaddrinfo(c[0], c[1], |
| 357 | socket.AF_INET, |
| 358 | socket.SOCK_STREAM, |
| 359 | 0, |
| 360 | 0) |
| 361 | a = a[0] |
| 362 | s = socket.socket(a[0], a[1], a[2]); |
| 363 | s.connect(a[4]) |
| 364 | self.who = "%s" % a[3] |
| 365 | else: |
| 366 | s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM); |
| 367 | self.who = self.config['home'] + os.sep + "socket" |
| 368 | s.connect(self.who) |
| 369 | self.w = s.makefile("wb") |
| 370 | self.r = s.makefile("rb") |
| 371 | (res, challenge) = self._simple() |
| 372 | h = sha.sha() |
| 373 | h.update(self.config['password']) |
| 374 | h.update(binascii.unhexlify(challenge)) |
| 375 | self._simple("user", self.config['username'], h.hexdigest()) |
| 376 | self.state = 'connected' |
| 377 | except socket.error, e: |
| 378 | self._disconnect() |
| 379 | raise communicationError(self.who, e) |
| 380 | except: |
| 381 | self._disconnect() |
| 382 | raise |
| 383 | |
| 384 | def _disconnect(self): |
| 385 | # disconnect from the server, whatever state we are in |
| 386 | try: |
| 387 | del self.w |
| 388 | del self.r |
| 389 | except: |
| 390 | pass |
| 391 | self.state = 'disconnected' |
| 392 | |
| 393 | ######################################################################## |
| 394 | # Operations |
| 395 | |
| 396 | def become(self, who): |
| 397 | """Become another user. |
| 398 | |
| 399 | Arguments: |
| 400 | who -- the user to become. |
| 401 | |
| 402 | Only trusted users can perform this operation. |
| 403 | """ |
| 404 | self._simple("become", who) |
| 405 | |
| 406 | def play(self, track): |
| 407 | """Play a track. |
| 408 | |
| 409 | Arguments: |
| 410 | track -- the path of the track to play. |
| 411 | |
| 412 | Returns the ID of the new queue entry. |
| 413 | |
| 414 | Note that queue IDs are unicode strings (because all track information |
| 415 | values are unicode strings). |
| 416 | """ |
| 417 | res, details = self._simple("play", track) |
| 418 | return unicode(details) # because it's unicode in queue() output |
| 419 | |
| 420 | def remove(self, track): |
| 421 | """Remove a track from the queue. |
| 422 | |
| 423 | Arguments: |
| 424 | track -- the path or ID of the track to remove. |
| 425 | """ |
| 426 | self._simple("remove", track) |
| 427 | |
| 428 | def enable(self): |
| 429 | """Enable playing.""" |
| 430 | self._simple("enable") |
| 431 | |
| 432 | def disable(self, *now): |
| 433 | """Disable playing. |
| 434 | |
| 435 | Arguments: |
| 436 | now -- if present (with any value), the current track is stopped |
| 437 | too. |
| 438 | """ |
| 439 | if now: |
| 440 | self._simple("disable", "now") |
| 441 | else: |
| 442 | self._simple("disable") |
| 443 | |
| 444 | def scratch(self, *id): |
| 445 | """Scratch the currently playing track. |
| 446 | |
| 447 | Arguments: |
| 448 | id -- if present, the ID of the track to scratch. |
| 449 | """ |
| 450 | if id: |
| 451 | self._simple("scratch", id[0]) |
| 452 | else: |
| 453 | self._simple("scratch") |
| 454 | |
| 455 | def shutdown(self): |
| 456 | """Shut down the server. |
| 457 | |
| 458 | Only trusted users can perform this operation. |
| 459 | """ |
| 460 | self._simple("shutdown") |
| 461 | |
| 462 | def reconfigure(self): |
| 463 | """Make the server reload its configuration. |
| 464 | |
| 465 | Only trusted users can perform this operation. |
| 466 | """ |
| 467 | self._simple("reconfigure") |
| 468 | |
| 469 | def rescan(self, pattern): |
| 470 | """Rescan one or more collections. |
| 471 | |
| 472 | Arguments: |
| 473 | pattern -- glob pattern matching collections to rescan. |
| 474 | |
| 475 | Only trusted users can perform this operation. |
| 476 | """ |
| 477 | self._simple("rescan", pattern) |
| 478 | |
| 479 | def version(self): |
| 480 | """Return the server's version number.""" |
| 481 | return self._simple("version")[1] |
| 482 | |
| 483 | def playing(self): |
| 484 | """Return the currently playing track. |
| 485 | |
| 486 | If a track is playing then it is returned as a dictionary. See |
| 487 | disorder_protocol(5) for the meanings of the keys. All keys are |
| 488 | plain strings but the values will be unicode strings. |
| 489 | |
| 490 | If no track is playing then None is returned.""" |
| 491 | res, details = self._simple("playing") |
| 492 | if res % 10 != 9: |
| 493 | try: |
| 494 | return _queueEntry(details) |
| 495 | except _splitError, s: |
| 496 | raise protocolError(self.who, s.str()) |
| 497 | else: |
| 498 | return None |
| 499 | |
| 500 | def _somequeue(self, command): |
| 501 | self._simple(command) |
| 502 | try: |
| 503 | return map(lambda s: _queueEntry(s), self._body()) |
| 504 | except _splitError, s: |
| 505 | raise protocolError(self.who, s.str()) |
| 506 | |
| 507 | def recent(self): |
| 508 | """Return a list of recently played tracks. |
| 509 | |
| 510 | The return value is a list of dictionaries corresponding to |
| 511 | recently played tracks. The oldest track comes first. |
| 512 | |
| 513 | See disorder_protocol(5) for the meanings of the keys. All keys are |
| 514 | plain strings but the values will be unicode strings.""" |
| 515 | return self._somequeue("recent") |
| 516 | |
| 517 | def queue(self): |
| 518 | """Return the current queue. |
| 519 | |
| 520 | The return value is a list of dictionaries corresponding to |
| 521 | recently played tracks. The next track to be played comes first. |
| 522 | |
| 523 | See disorder_protocol(5) for the meanings of the keys. All keys are |
| 524 | plain strings but the values will be unicode strings.""" |
| 525 | return self._somequeue("queue") |
| 526 | |
| 527 | def _somedir(self, command, dir, re): |
| 528 | if re: |
| 529 | self._simple(command, dir, re[0]) |
| 530 | else: |
| 531 | self._simple(command, dir) |
| 532 | return self._body() |
| 533 | |
| 534 | def directories(self, dir, *re): |
| 535 | """List subdirectories of a directory. |
| 536 | |
| 537 | Arguments: |
| 538 | dir -- directory to list, or '' for the whole root. |
| 539 | re -- regexp that results must match. Optional. |
| 540 | |
| 541 | The return value is a list of the (nonempty) subdirectories of dir. |
| 542 | If dir is '' then a list of top-level directories is returned. |
| 543 | |
| 544 | If a regexp is specified then the basename of each result must |
| 545 | match. Matching is case-independent. See pcrepattern(3). |
| 546 | """ |
| 547 | return self._somedir("dirs", dir, re) |
| 548 | |
| 549 | def files(self, dir, *re): |
| 550 | """List files within a directory. |
| 551 | |
| 552 | Arguments: |
| 553 | dir -- directory to list, or '' for the whole root. |
| 554 | re -- regexp that results must match. Optional. |
| 555 | |
| 556 | The return value is a list of playable files in dir. If dir is '' |
| 557 | then a list of top-level files is returned. |
| 558 | |
| 559 | If a regexp is specified then the basename of each result must |
| 560 | match. Matching is case-independent. See pcrepattern(3). |
| 561 | """ |
| 562 | return self._somedir("files", dir, re) |
| 563 | |
| 564 | def allfiles(self, dir, *re): |
| 565 | """List subdirectories and files within a directory. |
| 566 | |
| 567 | Arguments: |
| 568 | dir -- directory to list, or '' for the whole root. |
| 569 | re -- regexp that results must match. Optional. |
| 570 | |
| 571 | The return value is a list of all (nonempty) subdirectories and |
| 572 | files within dir. If dir is '' then a list of top-level files and |
| 573 | directories is returned. |
| 574 | |
| 575 | If a regexp is specified then the basename of each result must |
| 576 | match. Matching is case-independent. See pcrepattern(3). |
| 577 | """ |
| 578 | return self._somedir("allfiles", dir, re) |
| 579 | |
| 580 | def set(self, track, key, value): |
| 581 | """Set a preference value. |
| 582 | |
| 583 | Arguments: |
| 584 | track -- the track to modify |
| 585 | key -- the preference name |
| 586 | value -- the new preference value |
| 587 | """ |
| 588 | self._simple("set", track, key, value) |
| 589 | |
| 590 | def unset(self, track, key): |
| 591 | """Unset a preference value. |
| 592 | |
| 593 | Arguments: |
| 594 | track -- the track to modify |
| 595 | key -- the preference to remove |
| 596 | """ |
| 597 | self._simple("set", track, key, value) |
| 598 | |
| 599 | def get(self, track, key): |
| 600 | """Get a preference value. |
| 601 | |
| 602 | Arguments: |
| 603 | track -- the track to query |
| 604 | key -- the preference to remove |
| 605 | |
| 606 | The return value is the preference. |
| 607 | """ |
| 608 | ret, details = self._simple("get", track, key) |
| 609 | if ret == 555: |
| 610 | return None |
| 611 | else: |
| 612 | return details |
| 613 | |
| 614 | def prefs(self, track): |
| 615 | """Get all the preferences for a track. |
| 616 | |
| 617 | Arguments: |
| 618 | track -- the track to query |
| 619 | |
| 620 | The return value is a dictionary of all the track's preferences. |
| 621 | Note that even nominally numeric values remain encoded as strings. |
| 622 | """ |
| 623 | self._simple("prefs", track) |
| 624 | r = {} |
| 625 | for line in self._body(): |
| 626 | try: |
| 627 | kv = _split(line) |
| 628 | except _splitError, s: |
| 629 | raise protocolError(self.who, s.str()) |
| 630 | if len(kv) != 2: |
| 631 | raise protocolError(self.who, "invalid prefs body line") |
| 632 | r[kv[0]] = kv[1] |
| 633 | return r |
| 634 | |
| 635 | def _boolean(self, s): |
| 636 | return s[1] == 'yes' |
| 637 | |
| 638 | def exists(self, track): |
| 639 | """Return true if a track exists |
| 640 | |
| 641 | Arguments: |
| 642 | track -- the track to check for""" |
| 643 | return self._boolean(self._simple("exists", track)) |
| 644 | |
| 645 | def enabled(self): |
| 646 | """Return true if playing is enabled""" |
| 647 | return self._boolean(self._simple("enabled")) |
| 648 | |
| 649 | def random_enabled(self): |
| 650 | """Return true if random play is enabled""" |
| 651 | return self._boolean(self._simple("random-enabled")) |
| 652 | |
| 653 | def random_enable(self): |
| 654 | """Enable random play.""" |
| 655 | self._simple("random-enable") |
| 656 | |
| 657 | def random_disable(self): |
| 658 | """Disable random play.""" |
| 659 | self._simple("random-disable") |
| 660 | |
| 661 | def length(self, track): |
| 662 | """Return the length of a track in seconds. |
| 663 | |
| 664 | Arguments: |
| 665 | track -- the track to query. |
| 666 | """ |
| 667 | ret, details = self._simple("length", track) |
| 668 | return int(details) |
| 669 | |
| 670 | def search(self, words): |
| 671 | """Search for tracks. |
| 672 | |
| 673 | Arguments: |
| 674 | words -- the set of words to search for. |
| 675 | |
| 676 | The return value is a list of track path names, all of which contain |
| 677 | all of the required words (in their path name, trackname |
| 678 | preferences, etc.) |
| 679 | """ |
| 680 | self._simple("search", _quote(words)) |
| 681 | return self._body() |
| 682 | |
| 683 | def tags(self): |
| 684 | """List all tags |
| 685 | |
| 686 | The return value is a list of all tags which apply to at least one |
| 687 | track.""" |
| 688 | self._simple("tags") |
| 689 | return self._body() |
| 690 | |
| 691 | def stats(self): |
| 692 | """Get server statistics. |
| 693 | |
| 694 | The return value is list of statistics. |
| 695 | """ |
| 696 | self._simple("stats") |
| 697 | return self._body() |
| 698 | |
| 699 | def dump(self): |
| 700 | """Get all preferences. |
| 701 | |
| 702 | The return value is an encoded dump of the preferences database. |
| 703 | """ |
| 704 | self._simple("dump") |
| 705 | return self._body() |
| 706 | |
| 707 | def set_volume(self, left, right): |
| 708 | """Set volume. |
| 709 | |
| 710 | Arguments: |
| 711 | left -- volume for the left speaker. |
| 712 | right -- volume for the right speaker. |
| 713 | """ |
| 714 | self._simple("volume", left, right) |
| 715 | |
| 716 | def get_volume(self): |
| 717 | """Get volume. |
| 718 | |
| 719 | The return value a tuple consisting of the left and right volumes. |
| 720 | """ |
| 721 | ret, details = self._simple("volume") |
| 722 | return map(int,string.split(details)) |
| 723 | |
| 724 | def move(self, track, delta): |
| 725 | """Move a track in the queue. |
| 726 | |
| 727 | Arguments: |
| 728 | track -- the name or ID of the track to move |
| 729 | delta -- the number of steps towards the head of the queue to move |
| 730 | """ |
| 731 | ret, details = self._simple("move", track, str(delta)) |
| 732 | return int(details) |
| 733 | |
| 734 | def moveafter(self, target, tracks): |
| 735 | """Move a track in the queue |
| 736 | |
| 737 | Arguments: |
| 738 | target -- target ID or None |
| 739 | tracks -- a list of IDs to move |
| 740 | |
| 741 | If target is '' or is not in the queue then the tracks are moved to |
| 742 | the head of the queue. |
| 743 | |
| 744 | Otherwise the tracks are moved to just after the target.""" |
| 745 | if target is None: |
| 746 | target = '' |
| 747 | self._simple("moveafter", target, *tracks) |
| 748 | |
| 749 | def log(self, callback): |
| 750 | """Read event log entries as they happen. |
| 751 | |
| 752 | Each event log entry is handled by passing it to callback. |
| 753 | |
| 754 | The callback takes two arguments, the first is the client and the |
| 755 | second the line from the event log. |
| 756 | |
| 757 | The callback should return True to continue or False to stop (don't |
| 758 | forget this, or your program will mysteriously misbehave). |
| 759 | |
| 760 | It is suggested that you use the disorder.monitor class instead of |
| 761 | calling this method directly, but this is not mandatory. |
| 762 | |
| 763 | See disorder_protocol(5) for the event log syntax. |
| 764 | |
| 765 | Arguments: |
| 766 | callback -- function to call with log entry |
| 767 | """ |
| 768 | ret, details = self._simple("log") |
| 769 | while True: |
| 770 | l = self._line() |
| 771 | self._debug(client.debug_body, "<<< %s" % l) |
| 772 | if l != '' and l[0] == '.': |
| 773 | if l == '.': |
| 774 | return |
| 775 | l = l[1:] |
| 776 | if not callback(self, l): |
| 777 | break |
| 778 | # tell the server to stop sending, eat the remains of the body, |
| 779 | # eat the response |
| 780 | self._send("version") |
| 781 | self._body() |
| 782 | self._response() |
| 783 | |
| 784 | def pause(self): |
| 785 | """Pause the current track.""" |
| 786 | self._simple("pause") |
| 787 | |
| 788 | def resume(self): |
| 789 | """Resume after a pause.""" |
| 790 | self._simple("resume") |
| 791 | |
| 792 | def part(self, track, context, part): |
| 793 | """Get a track name part |
| 794 | |
| 795 | Arguments: |
| 796 | track -- the track to query |
| 797 | context -- the context ('sort' or 'display') |
| 798 | part -- the desired part (usually 'artist', 'album' or 'title') |
| 799 | |
| 800 | The return value is the preference |
| 801 | """ |
| 802 | ret, details = self._simple("part", track, context, part) |
| 803 | return details |
| 804 | |
| 805 | def setglobal(self, key, value): |
| 806 | """Set a global preference value. |
| 807 | |
| 808 | Arguments: |
| 809 | key -- the preference name |
| 810 | value -- the new preference value |
| 811 | """ |
| 812 | self._simple("set-global", key, value) |
| 813 | |
| 814 | def unsetglobal(self, key): |
| 815 | """Unset a global preference value. |
| 816 | |
| 817 | Arguments: |
| 818 | key -- the preference to remove |
| 819 | """ |
| 820 | self._simple("set-global", key, value) |
| 821 | |
| 822 | def getglobal(self, key): |
| 823 | """Get a global preference value. |
| 824 | |
| 825 | Arguments: |
| 826 | key -- the preference to look up |
| 827 | |
| 828 | The return value is the preference |
| 829 | """ |
| 830 | ret, details = self._simple("get-global", key) |
| 831 | if ret == 555: |
| 832 | return None |
| 833 | else: |
| 834 | return details |
| 835 | |
| 836 | ######################################################################## |
| 837 | # I/O infrastructure |
| 838 | |
| 839 | def _line(self): |
| 840 | # read one response line and return as some suitable string object |
| 841 | # |
| 842 | # If an I/O error occurs, disconnect from the server. |
| 843 | # |
| 844 | # XXX does readline() DTRT regarding character encodings? |
| 845 | try: |
| 846 | l = self.r.readline() |
| 847 | if not re.search("\n", l): |
| 848 | raise communicationError(self.who, "peer disconnected") |
| 849 | l = l[:-1] |
| 850 | except: |
| 851 | self._disconnect() |
| 852 | raise |
| 853 | return unicode(l, "UTF-8") |
| 854 | |
| 855 | def _response(self): |
| 856 | # read a response as a (code, details) tuple |
| 857 | l = self._line() |
| 858 | self._debug(client.debug_proto, "<== %s" % l) |
| 859 | m = _response.match(l) |
| 860 | if m: |
| 861 | return int(m.group(1)), m.group(2) |
| 862 | else: |
| 863 | raise protocolError(self.who, "invalid response %s") |
| 864 | |
| 865 | def _send(self, *command): |
| 866 | # Quote and send a command |
| 867 | # |
| 868 | # Returns the encoded command. |
| 869 | quoted = _quote(command) |
| 870 | self._debug(client.debug_proto, "==> %s" % quoted) |
| 871 | encoded = quoted.encode("UTF-8") |
| 872 | try: |
| 873 | self.w.write(encoded) |
| 874 | self.w.write("\n") |
| 875 | self.w.flush() |
| 876 | return encoded |
| 877 | except IOError, e: |
| 878 | # e.g. EPIPE |
| 879 | self._disconnect() |
| 880 | raise communicationError(self.who, e) |
| 881 | except: |
| 882 | self._disconnect() |
| 883 | raise |
| 884 | |
| 885 | def _simple(self, *command): |
| 886 | # Issue a simple command, throw an exception on error |
| 887 | # |
| 888 | # If an I/O error occurs, disconnect from the server. |
| 889 | # |
| 890 | # On success or 'normal' errors returns response as a (code, details) tuple |
| 891 | # |
| 892 | # On error raise operationError |
| 893 | if self.state == 'disconnected': |
| 894 | self.connect() |
| 895 | if command: |
| 896 | cmd = self._send(*command) |
| 897 | else: |
| 898 | cmd = None |
| 899 | res, details = self._response() |
| 900 | if res / 100 == 2 or res == 555: |
| 901 | return res, details |
| 902 | raise operationError(res, details, cmd) |
| 903 | |
| 904 | def _body(self): |
| 905 | # Fetch a dot-stuffed body |
| 906 | result = [] |
| 907 | while True: |
| 908 | l = self._line() |
| 909 | self._debug(client.debug_body, "<<< %s" % l) |
| 910 | if l != '' and l[0] == '.': |
| 911 | if l == '.': |
| 912 | return result |
| 913 | l = l[1:] |
| 914 | result.append(l) |
| 915 | |
| 916 | ######################################################################## |
| 917 | # Configuration file parsing |
| 918 | |
| 919 | def _readfile(self, path): |
| 920 | # Read a configuration file |
| 921 | # |
| 922 | # Arguments: |
| 923 | # |
| 924 | # path -- path of file to read |
| 925 | |
| 926 | # handlers for various commands |
| 927 | def _collection(self, command, args): |
| 928 | if len(args) != 3: |
| 929 | return "'%s' takes three args" % command |
| 930 | self.config["collections"].append(args) |
| 931 | |
| 932 | def _unary(self, command, args): |
| 933 | if len(args) != 1: |
| 934 | return "'%s' takes only one arg" % command |
| 935 | self.config[command] = args[0] |
| 936 | |
| 937 | def _include(self, command, args): |
| 938 | if len(args) != 1: |
| 939 | return "'%s' takes only one arg" % command |
| 940 | self._readfile(args[0]) |
| 941 | |
| 942 | def _any(self, command, args): |
| 943 | self.config[command] = args |
| 944 | |
| 945 | # mapping of options to handlers |
| 946 | _options = { "collection": _collection, |
| 947 | "username": _unary, |
| 948 | "password": _unary, |
| 949 | "home": _unary, |
| 950 | "connect": _any, |
| 951 | "include": _include } |
| 952 | |
| 953 | # the parser |
| 954 | for lno, line in enumerate(file(path, "r")): |
| 955 | try: |
| 956 | fields = _split(line, 'comments') |
| 957 | except _splitError, s: |
| 958 | raise parseError(path, lno + 1, str(s)) |
| 959 | if fields: |
| 960 | command = fields[0] |
| 961 | # we just ignore options we don't know about, so as to cope gracefully |
| 962 | # with version skew (and nothing to do with implementor laziness) |
| 963 | if command in _options: |
| 964 | e = _options[command](self, command, fields[1:]) |
| 965 | if e: |
| 966 | self._parseError(path, lno + 1, e) |
| 967 | |
| 968 | def _parseError(self, path, lno, s): |
| 969 | raise parseError(path, lno, s) |
| 970 | |
| 971 | ######################################################################## |
| 972 | # monitor class |
| 973 | |
| 974 | class monitor: |
| 975 | """DisOrder event log monitor class |
| 976 | |
| 977 | Intended to be subclassed with methods corresponding to event log messages |
| 978 | the implementor cares about over-ridden.""" |
| 979 | |
| 980 | def __init__(self, c=None): |
| 981 | """Constructor for the monitor class |
| 982 | |
| 983 | Can be passed a client to use. If none is specified then one |
| 984 | will be created specially for the purpose. |
| 985 | |
| 986 | Arguments: |
| 987 | c -- client""" |
| 988 | if c == None: |
| 989 | c = client(); |
| 990 | self.c = c |
| 991 | |
| 992 | def run(self): |
| 993 | """Start monitoring logs. Continues monitoring until one of the |
| 994 | message-specific methods returns False. Can be called more than once |
| 995 | (but not recursively!)""" |
| 996 | self.c.log(self._callback) |
| 997 | |
| 998 | def when(self): |
| 999 | """Return the timestamp of the current (or most recent) event log entry""" |
| 1000 | return self.timestamp |
| 1001 | |
| 1002 | def _callback(self, c, line): |
| 1003 | try: |
| 1004 | bits = _split(line) |
| 1005 | except: |
| 1006 | return self.invalid(line) |
| 1007 | if(len(bits) < 2): |
| 1008 | return self.invalid(line) |
| 1009 | self.timestamp = int(bits[0], 16) |
| 1010 | keyword = bits[1] |
| 1011 | bits = bits[2:] |
| 1012 | if keyword == 'completed': |
| 1013 | if len(bits) == 1: |
| 1014 | return self.completed(bits[0]) |
| 1015 | elif keyword == 'failed': |
| 1016 | if len(bits) == 2: |
| 1017 | return self.failed(bits[0], bits[1]) |
| 1018 | elif keyword == 'moved': |
| 1019 | if len(bits) == 3: |
| 1020 | try: |
| 1021 | n = int(bits[1]) |
| 1022 | except: |
| 1023 | return self.invalid(line) |
| 1024 | return self.moved(bits[0], n, bits[2]) |
| 1025 | elif keyword == 'playing': |
| 1026 | if len(bits) == 1: |
| 1027 | return self.playing(bits[0], None) |
| 1028 | elif len(bits) == 2: |
| 1029 | return self.playing(bits[0], bits[1]) |
| 1030 | elif keyword == 'queue' or keyword == 'recent-added': |
| 1031 | try: |
| 1032 | q = _list2dict(bits) |
| 1033 | except: |
| 1034 | return self.invalid(line) |
| 1035 | if keyword == 'queue': |
| 1036 | return self.queue(q) |
| 1037 | if keyword == 'recent-added': |
| 1038 | return self.recent_added(q) |
| 1039 | elif keyword == 'recent-removed': |
| 1040 | if len(bits) == 1: |
| 1041 | return self.recent_removed(bits[0]) |
| 1042 | elif keyword == 'removed': |
| 1043 | if len(bits) == 1: |
| 1044 | return self.removed(bits[0], None) |
| 1045 | elif len(bits) == 2: |
| 1046 | return self.removed(bits[0], bits[1]) |
| 1047 | elif keyword == 'scratched': |
| 1048 | if len(bits) == 2: |
| 1049 | return self.scratched(bits[0], bits[1]) |
| 1050 | return self.invalid(line) |
| 1051 | |
| 1052 | def completed(self, track): |
| 1053 | """Called when a track completes. |
| 1054 | |
| 1055 | Arguments: |
| 1056 | track -- track that completed""" |
| 1057 | return True |
| 1058 | |
| 1059 | def failed(self, track, error): |
| 1060 | """Called when a player suffers an error. |
| 1061 | |
| 1062 | Arguments: |
| 1063 | track -- track that failed |
| 1064 | error -- error indicator""" |
| 1065 | return True |
| 1066 | |
| 1067 | def moved(self, id, offset, user): |
| 1068 | """Called when a track is moved in the queue. |
| 1069 | |
| 1070 | Arguments: |
| 1071 | id -- queue entry ID |
| 1072 | offset -- distance moved |
| 1073 | user -- user responsible""" |
| 1074 | return True |
| 1075 | |
| 1076 | def playing(self, track, user): |
| 1077 | """Called when a track starts playing. |
| 1078 | |
| 1079 | Arguments: |
| 1080 | track -- track that has started |
| 1081 | user -- user that submitted track, or None""" |
| 1082 | return True |
| 1083 | |
| 1084 | def queue(self, q): |
| 1085 | """Called when a track is added to the queue. |
| 1086 | |
| 1087 | Arguments: |
| 1088 | q -- dictionary of new queue entry""" |
| 1089 | return True |
| 1090 | |
| 1091 | def recent_added(self, q): |
| 1092 | """Called when a track is added to the recently played list |
| 1093 | |
| 1094 | Arguments: |
| 1095 | q -- dictionary of new queue entry""" |
| 1096 | return True |
| 1097 | |
| 1098 | def recent_removed(self, id): |
| 1099 | """Called when a track is removed from the recently played list |
| 1100 | |
| 1101 | Arguments: |
| 1102 | id -- ID of removed entry (always the oldest)""" |
| 1103 | return True |
| 1104 | |
| 1105 | def removed(self, id, user): |
| 1106 | """Called when a track is removed from the queue, either manually |
| 1107 | or in order to play it. |
| 1108 | |
| 1109 | Arguments: |
| 1110 | id -- ID of removed entry |
| 1111 | user -- user responsible (or None if we're playing this track)""" |
| 1112 | return True |
| 1113 | |
| 1114 | def scratched(self, track, user): |
| 1115 | """Called when a track is scratched |
| 1116 | |
| 1117 | Arguments: |
| 1118 | track -- track that was scratched |
| 1119 | user -- user responsible""" |
| 1120 | return True |
| 1121 | |
| 1122 | def invalid(self, line): |
| 1123 | """Called when an event log line cannot be interpreted |
| 1124 | |
| 1125 | Arguments: |
| 1126 | line -- line that could not be understood""" |
| 1127 | return True |
| 1128 | |
| 1129 | # Local Variables: |
| 1130 | # mode:python |
| 1131 | # py-indent-offset:2 |
| 1132 | # comment-column:40 |
| 1133 | # fill-column:72 |
| 1134 | # End: |