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