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460b9539 | 1 | # |
79cbb91d | 2 | # Copyright (C) 2004, 2005, 2007 Richard Kettlewell |
460b9539 | 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 | ||
79cbb91d RK |
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. | |
460b9539 | 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" | |
eee9d4b3 | 61 | _userconf = True |
460b9539 | 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 | """ | |
f383b2f1 | 113 | def __init__(self, res, details, cmd=None): |
460b9539 | 114 | self.res_ = int(res) |
f383b2f1 | 115 | self.cmd_ = cmd |
460b9539 | 116 | self.details_ = details |
117 | def __str__(self): | |
f383b2f1 RK |
118 | """Return the complete response string from the server, with the command |
119 | if available. | |
460b9539 | 120 | |
121 | Excludes the final newline. | |
122 | """ | |
f383b2f1 RK |
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_) | |
460b9539 | 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() | |
f5eb2aff | 239 | d[str(k)] = v |
460b9539 | 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" | |
f5eb2aff RK |
302 | if os.path.exists(_configfile): |
303 | self._readfile(_configfile) | |
460b9539 | 304 | if os.path.exists(privconf): |
305 | self._readfile(privconf) | |
eee9d4b3 | 306 | if os.path.exists(passfile) and _userconf: |
460b9539 | 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. | |
81e440ce RK |
411 | |
412 | Returns the ID of the new queue entry. | |
79cbb91d RK |
413 | |
414 | Note that queue IDs are unicode strings (because all track information | |
415 | values are unicode strings). | |
460b9539 | 416 | """ |
81e440ce RK |
417 | res, details = self._simple("play", track) |
418 | return unicode(details) # because it's unicode in queue() output | |
460b9539 | 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 | ||
79cbb91d RK |
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 | ||
460b9539 | 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 | |
79cbb91d RK |
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.""" | |
460b9539 | 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 | |
79cbb91d RK |
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.""" | |
460b9539 | 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 | ||
79cbb91d | 606 | The return value is the preference. |
460b9539 | 607 | """ |
608 | ret, details = self._simple("get", track, key) | |
fb1bc1f5 RK |
609 | if ret == 555: |
610 | return None | |
611 | else: | |
612 | return details | |
460b9539 | 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 | """ | |
f383b2f1 | 680 | self._simple("search", _quote(words)) |
460b9539 | 681 | return self._body() |
682 | ||
31773020 RK |
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 | ||
460b9539 | 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 | ||
81e440ce RK |
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 | ||
460b9539 | 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 | ||
f35e5800 RK |
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) | |
fb1bc1f5 RK |
831 | if ret == 555: |
832 | return None | |
833 | else: | |
834 | return details | |
f35e5800 | 835 | |
460b9539 | 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): | |
f383b2f1 RK |
866 | # Quote and send a command |
867 | # | |
868 | # Returns the encoded command. | |
460b9539 | 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() | |
f383b2f1 | 876 | return encoded |
460b9539 | 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 | # | |
fb1bc1f5 | 890 | # On success or 'normal' errors returns response as a (code, details) tuple |
460b9539 | 891 | # |
892 | # On error raise operationError | |
893 | if self.state == 'disconnected': | |
894 | self.connect() | |
895 | if command: | |
f383b2f1 RK |
896 | cmd = self._send(*command) |
897 | else: | |
898 | cmd = None | |
460b9539 | 899 | res, details = self._response() |
fb1bc1f5 | 900 | if res / 100 == 2 or res == 555: |
460b9539 | 901 | return res, details |
f383b2f1 | 902 | raise operationError(res, details, cmd) |
460b9539 | 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: |