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460b9539 | 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" | |
eee9d4b3 | 56 | _userconf = True |
460b9539 | 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 | """ | |
f383b2f1 | 108 | def __init__(self, res, details, cmd=None): |
460b9539 | 109 | self.res_ = int(res) |
f383b2f1 | 110 | self.cmd_ = cmd |
460b9539 | 111 | self.details_ = details |
112 | def __str__(self): | |
f383b2f1 RK |
113 | """Return the complete response string from the server, with the command |
114 | if available. | |
460b9539 | 115 | |
116 | Excludes the final newline. | |
117 | """ | |
f383b2f1 RK |
118 | if self.cmd_ is None: |
119 | return "%d %s" % (self.res_, self.details_) | |
120 | else: | |
121 | return "%d %s [%s]" % (self.res_, self.details_, self.cmd_) | |
460b9539 | 122 | def response(self): |
123 | """Return the response code from the server.""" | |
124 | return self.res_ | |
125 | def details(self): | |
126 | """Returns the detail string from the server.""" | |
127 | return self.details_ | |
128 | ||
129 | class communicationError(Error): | |
130 | """DisOrder control protocol communication error. | |
131 | ||
132 | Indicates that communication with the server went wrong, perhaps | |
133 | because the server was restarted. The caller could report an error to | |
134 | the user and wait for further user instructions, or even automatically | |
135 | retry the operation. | |
136 | """ | |
137 | def __init__(self, who, error): | |
138 | self.who = who | |
139 | self.error = error | |
140 | def __str__(self): | |
141 | return "%s: %s" % (self.who, str(self.error)) | |
142 | ||
143 | ######################################################################## | |
144 | # DisOrder-specific text processing | |
145 | ||
146 | def _unescape(s): | |
147 | # Unescape the contents of a string | |
148 | # | |
149 | # Arguments: | |
150 | # | |
151 | # s -- string to unescape | |
152 | # | |
153 | s = re.sub("\\\\n", "\n", s) | |
154 | s = re.sub("\\\\(.)", "\\1", s) | |
155 | return s | |
156 | ||
157 | def _split(s, *comments): | |
158 | # Split a string into fields according to the usual Disorder string splitting | |
159 | # conventions. | |
160 | # | |
161 | # Arguments: | |
162 | # | |
163 | # s -- string to parse | |
164 | # comments -- if present, parse comments | |
165 | # | |
166 | # Return values: | |
167 | # | |
168 | # On success, a list of fields is returned. | |
169 | # | |
170 | # On error, disorder.parseError is thrown. | |
171 | # | |
172 | fields = [] | |
173 | while s != "": | |
174 | # discard comments | |
175 | if comments and s[0] == '#': | |
176 | break | |
177 | # strip spaces | |
178 | m = _ws.match(s) | |
179 | if m: | |
180 | s = s[m.end():] | |
181 | continue | |
182 | # pick of quoted fields of both kinds | |
183 | m = _squote.match(s) | |
184 | if not m: | |
185 | m = _dquote.match(s) | |
186 | if m: | |
187 | fields.append(_unescape(m.group(1))) | |
188 | s = s[m.end():] | |
189 | continue | |
190 | # and unquoted fields | |
191 | m = _unquoted.match(s) | |
192 | if m: | |
193 | fields.append(m.group(0)) | |
194 | s = s[m.end():] | |
195 | continue | |
196 | # anything left must be in error | |
197 | if s[0] == '"' or s[0] == '\'': | |
198 | raise _splitError("invalid quoted string") | |
199 | else: | |
200 | raise _splitError("syntax error") | |
201 | return fields | |
202 | ||
203 | def _escape(s): | |
204 | # Escape the contents of a string | |
205 | # | |
206 | # Arguments: | |
207 | # | |
208 | # s -- string to escape | |
209 | # | |
210 | if re.search("[\\\\\"'\n \t\r]", s) or s == '': | |
211 | s = re.sub(r'[\\"]', r'\\\g<0>', s) | |
212 | s = re.sub("\n", r"\\n", s) | |
213 | return '"' + s + '"' | |
214 | else: | |
215 | return s | |
216 | ||
217 | def _quote(list): | |
218 | # Quote a list of values | |
219 | return ' '.join(map(_escape, list)) | |
220 | ||
221 | def _sanitize(s): | |
222 | # Return the value of s in a form suitable for writing to stderr | |
223 | return s.encode(locale.nl_langinfo(locale.CODESET), 'replace') | |
224 | ||
225 | def _list2dict(l): | |
226 | # Convert a list of the form [k1, v1, k2, v2, ..., kN, vN] | |
227 | # to a dictionary {k1:v1, k2:v2, ..., kN:vN} | |
228 | d = {} | |
229 | i = iter(l) | |
230 | try: | |
231 | while True: | |
232 | k = i.next() | |
233 | v = i.next() | |
234 | d[k] = v | |
235 | except StopIteration: | |
236 | pass | |
237 | return d | |
238 | ||
239 | def _queueEntry(s): | |
240 | # parse a queue entry | |
241 | return _list2dict(_split(s)) | |
242 | ||
243 | ######################################################################## | |
244 | # The client class | |
245 | ||
246 | class client: | |
247 | """DisOrder client class. | |
248 | ||
249 | This class provides access to the DisOrder server either on this | |
250 | machine or across the internet. | |
251 | ||
252 | The server to connect to, and the username and password to use, are | |
253 | determined from the configuration files as described in 'man | |
254 | disorder_config'. | |
255 | ||
256 | All methods will connect if necessary, as soon as you have a | |
257 | disorder.client object you can start calling operational methods on | |
258 | it. | |
259 | ||
260 | However if the server is restarted then the next method called on a | |
261 | connection will throw an exception. This may be considered a bug. | |
262 | ||
263 | All methods block until they complete. | |
264 | ||
265 | Operation methods raise communicationError if the connection breaks, | |
266 | protocolError if the response from the server is malformed, or | |
267 | operationError if the response is valid but indicates that the | |
268 | operation failed. | |
269 | """ | |
270 | ||
271 | debug_proto = 0x0001 | |
272 | debug_body = 0x0002 | |
273 | ||
274 | def __init__(self): | |
275 | """Constructor for DisOrder client class. | |
276 | ||
277 | The constructor reads the configuration file, but does not connect | |
278 | to the server. | |
279 | ||
280 | If the environment variable DISORDER_PYTHON_DEBUG is set then the | |
281 | debug flags are initialised to that value. This can be overridden | |
282 | with the debug() method below. | |
283 | ||
284 | The constructor Raises parseError() if the configuration file is not | |
285 | valid. | |
286 | """ | |
287 | pw = pwd.getpwuid(os.getuid()) | |
288 | self.debugging = int(os.getenv("DISORDER_PYTHON_DEBUG", 0)) | |
289 | self.config = { 'collections': [], | |
290 | 'username': pw.pw_name, | |
291 | 'home': _dbhome } | |
292 | home = os.getenv("HOME") | |
293 | if not home: | |
294 | home = pw.pw_dir | |
295 | privconf = _configfile + "." + pw.pw_name | |
296 | passfile = home + os.sep + ".disorder" + os.sep + "passwd" | |
297 | self._readfile(_configfile) | |
298 | if os.path.exists(privconf): | |
299 | self._readfile(privconf) | |
eee9d4b3 | 300 | if os.path.exists(passfile) and _userconf: |
460b9539 | 301 | self._readfile(passfile) |
302 | self.state = 'disconnected' | |
303 | ||
304 | def debug(self, bits): | |
305 | """Enable or disable protocol debugging. Debug messages are written | |
306 | to sys.stderr. | |
307 | ||
308 | Arguments: | |
309 | bits -- bitmap of operations that should generate debug information | |
310 | ||
311 | Bitmap values: | |
312 | debug_proto -- dump control protocol messages (excluding bodies) | |
313 | debug_body -- dump control protocol message bodies | |
314 | """ | |
315 | self.debugging = bits | |
316 | ||
317 | def _debug(self, bit, s): | |
318 | # debug output | |
319 | if self.debugging & bit: | |
320 | sys.stderr.write(_sanitize(s)) | |
321 | sys.stderr.write("\n") | |
322 | sys.stderr.flush() | |
323 | ||
324 | def connect(self): | |
325 | """Connect to the DisOrder server and authenticate. | |
326 | ||
327 | Raises communicationError if connection fails and operationError if | |
328 | authentication fails (in which case disconnection is automatic). | |
329 | ||
330 | May be called more than once to retry connections (e.g. when the | |
331 | server is down). If we are already connected and authenticated, | |
332 | this is a no-op. | |
333 | ||
334 | Other operations automatically connect if we're not already | |
335 | connected, so it is not strictly necessary to call this method. | |
336 | """ | |
337 | if self.state == 'disconnected': | |
338 | try: | |
339 | self.state = 'connecting' | |
340 | if 'connect' in self.config and len(self.config['connect']) > 0: | |
341 | c = self.config['connect'] | |
342 | self.who = repr(c) # temporarily | |
343 | if len(c) == 1: | |
344 | a = socket.getaddrinfo(None, c[0], | |
345 | socket.AF_INET, | |
346 | socket.SOCK_STREAM, | |
347 | 0, | |
348 | 0) | |
349 | else: | |
350 | a = socket.getaddrinfo(c[0], c[1], | |
351 | socket.AF_INET, | |
352 | socket.SOCK_STREAM, | |
353 | 0, | |
354 | 0) | |
355 | a = a[0] | |
356 | s = socket.socket(a[0], a[1], a[2]); | |
357 | s.connect(a[4]) | |
358 | self.who = "%s" % a[3] | |
359 | else: | |
360 | s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM); | |
361 | self.who = self.config['home'] + os.sep + "socket" | |
362 | s.connect(self.who) | |
363 | self.w = s.makefile("wb") | |
364 | self.r = s.makefile("rb") | |
365 | (res, challenge) = self._simple() | |
366 | h = sha.sha() | |
367 | h.update(self.config['password']) | |
368 | h.update(binascii.unhexlify(challenge)) | |
369 | self._simple("user", self.config['username'], h.hexdigest()) | |
370 | self.state = 'connected' | |
371 | except socket.error, e: | |
372 | self._disconnect() | |
373 | raise communicationError(self.who, e) | |
374 | except: | |
375 | self._disconnect() | |
376 | raise | |
377 | ||
378 | def _disconnect(self): | |
379 | # disconnect from the server, whatever state we are in | |
380 | try: | |
381 | del self.w | |
382 | del self.r | |
383 | except: | |
384 | pass | |
385 | self.state = 'disconnected' | |
386 | ||
387 | ######################################################################## | |
388 | # Operations | |
389 | ||
390 | def become(self, who): | |
391 | """Become another user. | |
392 | ||
393 | Arguments: | |
394 | who -- the user to become. | |
395 | ||
396 | Only trusted users can perform this operation. | |
397 | """ | |
398 | self._simple("become", who) | |
399 | ||
400 | def play(self, track): | |
401 | """Play a track. | |
402 | ||
403 | Arguments: | |
404 | track -- the path of the track to play. | |
405 | """ | |
406 | self._simple("play", track) | |
407 | ||
408 | def remove(self, track): | |
409 | """Remove a track from the queue. | |
410 | ||
411 | Arguments: | |
412 | track -- the path or ID of the track to remove. | |
413 | """ | |
414 | self._simple("remove", track) | |
415 | ||
416 | def enable(self): | |
417 | """Enable playing.""" | |
418 | self._simple("enable") | |
419 | ||
420 | def disable(self, *now): | |
421 | """Disable playing. | |
422 | ||
423 | Arguments: | |
424 | now -- if present (with any value), the current track is stopped | |
425 | too. | |
426 | """ | |
427 | if now: | |
428 | self._simple("disable", "now") | |
429 | else: | |
430 | self._simple("disable") | |
431 | ||
432 | def scratch(self, *id): | |
433 | """Scratch the currently playing track. | |
434 | ||
435 | Arguments: | |
436 | id -- if present, the ID of the track to scratch. | |
437 | """ | |
438 | if id: | |
439 | self._simple("scratch", id[0]) | |
440 | else: | |
441 | self._simple("scratch") | |
442 | ||
443 | def shutdown(self): | |
444 | """Shut down the server. | |
445 | ||
446 | Only trusted users can perform this operation. | |
447 | """ | |
448 | self._simple("shutdown") | |
449 | ||
450 | def reconfigure(self): | |
451 | """Make the server reload its configuration. | |
452 | ||
453 | Only trusted users can perform this operation. | |
454 | """ | |
455 | self._simple("reconfigure") | |
456 | ||
457 | def rescan(self, pattern): | |
458 | """Rescan one or more collections. | |
459 | ||
460 | Arguments: | |
461 | pattern -- glob pattern matching collections to rescan. | |
462 | ||
463 | Only trusted users can perform this operation. | |
464 | """ | |
465 | self._simple("rescan", pattern) | |
466 | ||
467 | def version(self): | |
468 | """Return the server's version number.""" | |
469 | return self._simple("version")[1] | |
470 | ||
471 | def playing(self): | |
472 | """Return the currently playing track. | |
473 | ||
474 | If a track is playing then it is returned as a dictionary. | |
475 | If no track is playing then None is returned.""" | |
476 | res, details = self._simple("playing") | |
477 | if res % 10 != 9: | |
478 | try: | |
479 | return _queueEntry(details) | |
480 | except _splitError, s: | |
481 | raise protocolError(self.who, s.str()) | |
482 | else: | |
483 | return None | |
484 | ||
485 | def _somequeue(self, command): | |
486 | self._simple(command) | |
487 | try: | |
488 | return map(lambda s: _queueEntry(s), self._body()) | |
489 | except _splitError, s: | |
490 | raise protocolError(self.who, s.str()) | |
491 | ||
492 | def recent(self): | |
493 | """Return a list of recently played tracks. | |
494 | ||
495 | The return value is a list of dictionaries corresponding to | |
496 | recently played tracks. The oldest track comes first.""" | |
497 | return self._somequeue("recent") | |
498 | ||
499 | def queue(self): | |
500 | """Return the current queue. | |
501 | ||
502 | The return value is a list of dictionaries corresponding to | |
503 | recently played tracks. The next track to be played comes first.""" | |
504 | return self._somequeue("queue") | |
505 | ||
506 | def _somedir(self, command, dir, re): | |
507 | if re: | |
508 | self._simple(command, dir, re[0]) | |
509 | else: | |
510 | self._simple(command, dir) | |
511 | return self._body() | |
512 | ||
513 | def directories(self, dir, *re): | |
514 | """List subdirectories of a directory. | |
515 | ||
516 | Arguments: | |
517 | dir -- directory to list, or '' for the whole root. | |
518 | re -- regexp that results must match. Optional. | |
519 | ||
520 | The return value is a list of the (nonempty) subdirectories of dir. | |
521 | If dir is '' then a list of top-level directories is returned. | |
522 | ||
523 | If a regexp is specified then the basename of each result must | |
524 | match. Matching is case-independent. See pcrepattern(3). | |
525 | """ | |
526 | return self._somedir("dirs", dir, re) | |
527 | ||
528 | def files(self, dir, *re): | |
529 | """List files within a directory. | |
530 | ||
531 | Arguments: | |
532 | dir -- directory to list, or '' for the whole root. | |
533 | re -- regexp that results must match. Optional. | |
534 | ||
535 | The return value is a list of playable files in dir. If dir is '' | |
536 | then a list of top-level files is returned. | |
537 | ||
538 | If a regexp is specified then the basename of each result must | |
539 | match. Matching is case-independent. See pcrepattern(3). | |
540 | """ | |
541 | return self._somedir("files", dir, re) | |
542 | ||
543 | def allfiles(self, dir, *re): | |
544 | """List subdirectories and files within a directory. | |
545 | ||
546 | Arguments: | |
547 | dir -- directory to list, or '' for the whole root. | |
548 | re -- regexp that results must match. Optional. | |
549 | ||
550 | The return value is a list of all (nonempty) subdirectories and | |
551 | files within dir. If dir is '' then a list of top-level files and | |
552 | directories is returned. | |
553 | ||
554 | If a regexp is specified then the basename of each result must | |
555 | match. Matching is case-independent. See pcrepattern(3). | |
556 | """ | |
557 | return self._somedir("allfiles", dir, re) | |
558 | ||
559 | def set(self, track, key, value): | |
560 | """Set a preference value. | |
561 | ||
562 | Arguments: | |
563 | track -- the track to modify | |
564 | key -- the preference name | |
565 | value -- the new preference value | |
566 | """ | |
567 | self._simple("set", track, key, value) | |
568 | ||
569 | def unset(self, track, key): | |
570 | """Unset a preference value. | |
571 | ||
572 | Arguments: | |
573 | track -- the track to modify | |
574 | key -- the preference to remove | |
575 | """ | |
576 | self._simple("set", track, key, value) | |
577 | ||
578 | def get(self, track, key): | |
579 | """Get a preference value. | |
580 | ||
581 | Arguments: | |
582 | track -- the track to query | |
583 | key -- the preference to remove | |
584 | ||
585 | The return value is the preference | |
586 | """ | |
587 | ret, details = self._simple("get", track, key) | |
588 | return details | |
589 | ||
590 | def prefs(self, track): | |
591 | """Get all the preferences for a track. | |
592 | ||
593 | Arguments: | |
594 | track -- the track to query | |
595 | ||
596 | The return value is a dictionary of all the track's preferences. | |
597 | Note that even nominally numeric values remain encoded as strings. | |
598 | """ | |
599 | self._simple("prefs", track) | |
600 | r = {} | |
601 | for line in self._body(): | |
602 | try: | |
603 | kv = _split(line) | |
604 | except _splitError, s: | |
605 | raise protocolError(self.who, s.str()) | |
606 | if len(kv) != 2: | |
607 | raise protocolError(self.who, "invalid prefs body line") | |
608 | r[kv[0]] = kv[1] | |
609 | return r | |
610 | ||
611 | def _boolean(self, s): | |
612 | return s[1] == 'yes' | |
613 | ||
614 | def exists(self, track): | |
615 | """Return true if a track exists | |
616 | ||
617 | Arguments: | |
618 | track -- the track to check for""" | |
619 | return self._boolean(self._simple("exists", track)) | |
620 | ||
621 | def enabled(self): | |
622 | """Return true if playing is enabled""" | |
623 | return self._boolean(self._simple("enabled")) | |
624 | ||
625 | def random_enabled(self): | |
626 | """Return true if random play is enabled""" | |
627 | return self._boolean(self._simple("random-enabled")) | |
628 | ||
629 | def random_enable(self): | |
630 | """Enable random play.""" | |
631 | self._simple("random-enable") | |
632 | ||
633 | def random_disable(self): | |
634 | """Disable random play.""" | |
635 | self._simple("random-disable") | |
636 | ||
637 | def length(self, track): | |
638 | """Return the length of a track in seconds. | |
639 | ||
640 | Arguments: | |
641 | track -- the track to query. | |
642 | """ | |
643 | ret, details = self._simple("length", track) | |
644 | return int(details) | |
645 | ||
646 | def search(self, words): | |
647 | """Search for tracks. | |
648 | ||
649 | Arguments: | |
650 | words -- the set of words to search for. | |
651 | ||
652 | The return value is a list of track path names, all of which contain | |
653 | all of the required words (in their path name, trackname | |
654 | preferences, etc.) | |
655 | """ | |
f383b2f1 | 656 | self._simple("search", _quote(words)) |
460b9539 | 657 | return self._body() |
658 | ||
659 | def stats(self): | |
660 | """Get server statistics. | |
661 | ||
662 | The return value is list of statistics. | |
663 | """ | |
664 | self._simple("stats") | |
665 | return self._body() | |
666 | ||
667 | def dump(self): | |
668 | """Get all preferences. | |
669 | ||
670 | The return value is an encoded dump of the preferences database. | |
671 | """ | |
672 | self._simple("dump") | |
673 | return self._body() | |
674 | ||
675 | def set_volume(self, left, right): | |
676 | """Set volume. | |
677 | ||
678 | Arguments: | |
679 | left -- volume for the left speaker. | |
680 | right -- volume for the right speaker. | |
681 | """ | |
682 | self._simple("volume", left, right) | |
683 | ||
684 | def get_volume(self): | |
685 | """Get volume. | |
686 | ||
687 | The return value a tuple consisting of the left and right volumes. | |
688 | """ | |
689 | ret, details = self._simple("volume") | |
690 | return map(int,string.split(details)) | |
691 | ||
692 | def move(self, track, delta): | |
693 | """Move a track in the queue. | |
694 | ||
695 | Arguments: | |
696 | track -- the name or ID of the track to move | |
697 | delta -- the number of steps towards the head of the queue to move | |
698 | """ | |
699 | ret, details = self._simple("move", track, str(delta)) | |
700 | return int(details) | |
701 | ||
702 | def log(self, callback): | |
703 | """Read event log entries as they happen. | |
704 | ||
705 | Each event log entry is handled by passing it to callback. | |
706 | ||
707 | The callback takes two arguments, the first is the client and the | |
708 | second the line from the event log. | |
709 | ||
710 | The callback should return True to continue or False to stop (don't | |
711 | forget this, or your program will mysteriously misbehave). | |
712 | ||
713 | It is suggested that you use the disorder.monitor class instead of | |
714 | calling this method directly, but this is not mandatory. | |
715 | ||
716 | See disorder_protocol(5) for the event log syntax. | |
717 | ||
718 | Arguments: | |
719 | callback -- function to call with log entry | |
720 | """ | |
721 | ret, details = self._simple("log") | |
722 | while True: | |
723 | l = self._line() | |
724 | self._debug(client.debug_body, "<<< %s" % l) | |
725 | if l != '' and l[0] == '.': | |
726 | if l == '.': | |
727 | return | |
728 | l = l[1:] | |
729 | if not callback(self, l): | |
730 | break | |
731 | # tell the server to stop sending, eat the remains of the body, | |
732 | # eat the response | |
733 | self._send("version") | |
734 | self._body() | |
735 | self._response() | |
736 | ||
737 | def pause(self): | |
738 | """Pause the current track.""" | |
739 | self._simple("pause") | |
740 | ||
741 | def resume(self): | |
742 | """Resume after a pause.""" | |
743 | self._simple("resume") | |
744 | ||
745 | def part(self, track, context, part): | |
746 | """Get a track name part | |
747 | ||
748 | Arguments: | |
749 | track -- the track to query | |
750 | context -- the context ('sort' or 'display') | |
751 | part -- the desired part (usually 'artist', 'album' or 'title') | |
752 | ||
753 | The return value is the preference | |
754 | """ | |
755 | ret, details = self._simple("part", track, context, part) | |
756 | return details | |
757 | ||
758 | ######################################################################## | |
759 | # I/O infrastructure | |
760 | ||
761 | def _line(self): | |
762 | # read one response line and return as some suitable string object | |
763 | # | |
764 | # If an I/O error occurs, disconnect from the server. | |
765 | # | |
766 | # XXX does readline() DTRT regarding character encodings? | |
767 | try: | |
768 | l = self.r.readline() | |
769 | if not re.search("\n", l): | |
770 | raise communicationError(self.who, "peer disconnected") | |
771 | l = l[:-1] | |
772 | except: | |
773 | self._disconnect() | |
774 | raise | |
775 | return unicode(l, "UTF-8") | |
776 | ||
777 | def _response(self): | |
778 | # read a response as a (code, details) tuple | |
779 | l = self._line() | |
780 | self._debug(client.debug_proto, "<== %s" % l) | |
781 | m = _response.match(l) | |
782 | if m: | |
783 | return int(m.group(1)), m.group(2) | |
784 | else: | |
785 | raise protocolError(self.who, "invalid response %s") | |
786 | ||
787 | def _send(self, *command): | |
f383b2f1 RK |
788 | # Quote and send a command |
789 | # | |
790 | # Returns the encoded command. | |
460b9539 | 791 | quoted = _quote(command) |
792 | self._debug(client.debug_proto, "==> %s" % quoted) | |
793 | encoded = quoted.encode("UTF-8") | |
794 | try: | |
795 | self.w.write(encoded) | |
796 | self.w.write("\n") | |
797 | self.w.flush() | |
f383b2f1 | 798 | return encoded |
460b9539 | 799 | except IOError, e: |
800 | # e.g. EPIPE | |
801 | self._disconnect() | |
802 | raise communicationError(self.who, e) | |
803 | except: | |
804 | self._disconnect() | |
805 | raise | |
806 | ||
807 | def _simple(self, *command): | |
808 | # Issue a simple command, throw an exception on error | |
809 | # | |
810 | # If an I/O error occurs, disconnect from the server. | |
811 | # | |
812 | # On success returns response as a (code, details) tuple | |
813 | # | |
814 | # On error raise operationError | |
815 | if self.state == 'disconnected': | |
816 | self.connect() | |
817 | if command: | |
f383b2f1 RK |
818 | cmd = self._send(*command) |
819 | else: | |
820 | cmd = None | |
460b9539 | 821 | res, details = self._response() |
822 | if res / 100 == 2: | |
823 | return res, details | |
f383b2f1 | 824 | raise operationError(res, details, cmd) |
460b9539 | 825 | |
826 | def _body(self): | |
827 | # Fetch a dot-stuffed body | |
828 | result = [] | |
829 | while True: | |
830 | l = self._line() | |
831 | self._debug(client.debug_body, "<<< %s" % l) | |
832 | if l != '' and l[0] == '.': | |
833 | if l == '.': | |
834 | return result | |
835 | l = l[1:] | |
836 | result.append(l) | |
837 | ||
838 | ######################################################################## | |
839 | # Configuration file parsing | |
840 | ||
841 | def _readfile(self, path): | |
842 | # Read a configuration file | |
843 | # | |
844 | # Arguments: | |
845 | # | |
846 | # path -- path of file to read | |
847 | ||
848 | # handlers for various commands | |
849 | def _collection(self, command, args): | |
850 | if len(args) != 3: | |
851 | return "'%s' takes three args" % command | |
852 | self.config["collections"].append(args) | |
853 | ||
854 | def _unary(self, command, args): | |
855 | if len(args) != 1: | |
856 | return "'%s' takes only one arg" % command | |
857 | self.config[command] = args[0] | |
858 | ||
859 | def _include(self, command, args): | |
860 | if len(args) != 1: | |
861 | return "'%s' takes only one arg" % command | |
862 | self._readfile(args[0]) | |
863 | ||
864 | def _any(self, command, args): | |
865 | self.config[command] = args | |
866 | ||
867 | # mapping of options to handlers | |
868 | _options = { "collection": _collection, | |
869 | "username": _unary, | |
870 | "password": _unary, | |
871 | "home": _unary, | |
872 | "connect": _any, | |
873 | "include": _include } | |
874 | ||
875 | # the parser | |
876 | for lno, line in enumerate(file(path, "r")): | |
877 | try: | |
878 | fields = _split(line, 'comments') | |
879 | except _splitError, s: | |
880 | raise parseError(path, lno + 1, str(s)) | |
881 | if fields: | |
882 | command = fields[0] | |
883 | # we just ignore options we don't know about, so as to cope gracefully | |
884 | # with version skew (and nothing to do with implementor laziness) | |
885 | if command in _options: | |
886 | e = _options[command](self, command, fields[1:]) | |
887 | if e: | |
888 | self._parseError(path, lno + 1, e) | |
889 | ||
890 | def _parseError(self, path, lno, s): | |
891 | raise parseError(path, lno, s) | |
892 | ||
893 | ######################################################################## | |
894 | # monitor class | |
895 | ||
896 | class monitor: | |
897 | """DisOrder event log monitor class | |
898 | ||
899 | Intended to be subclassed with methods corresponding to event log messages | |
900 | the implementor cares about over-ridden.""" | |
901 | ||
902 | def __init__(self, c=None): | |
903 | """Constructor for the monitor class | |
904 | ||
905 | Can be passed a client to use. If none is specified then one | |
906 | will be created specially for the purpose. | |
907 | ||
908 | Arguments: | |
909 | c -- client""" | |
910 | if c == None: | |
911 | c = client(); | |
912 | self.c = c | |
913 | ||
914 | def run(self): | |
915 | """Start monitoring logs. Continues monitoring until one of the | |
916 | message-specific methods returns False. Can be called more than once | |
917 | (but not recursively!)""" | |
918 | self.c.log(self._callback) | |
919 | ||
920 | def when(self): | |
921 | """Return the timestamp of the current (or most recent) event log entry""" | |
922 | return self.timestamp | |
923 | ||
924 | def _callback(self, c, line): | |
925 | try: | |
926 | bits = _split(line) | |
927 | except: | |
928 | return self.invalid(line) | |
929 | if(len(bits) < 2): | |
930 | return self.invalid(line) | |
931 | self.timestamp = int(bits[0], 16) | |
932 | keyword = bits[1] | |
933 | bits = bits[2:] | |
934 | if keyword == 'completed': | |
935 | if len(bits) == 1: | |
936 | return self.completed(bits[0]) | |
937 | elif keyword == 'failed': | |
938 | if len(bits) == 2: | |
939 | return self.failed(bits[0], bits[1]) | |
940 | elif keyword == 'moved': | |
941 | if len(bits) == 3: | |
942 | try: | |
943 | n = int(bits[1]) | |
944 | except: | |
945 | return self.invalid(line) | |
946 | return self.moved(bits[0], n, bits[2]) | |
947 | elif keyword == 'playing': | |
948 | if len(bits) == 1: | |
949 | return self.playing(bits[0], None) | |
950 | elif len(bits) == 2: | |
951 | return self.playing(bits[0], bits[1]) | |
952 | elif keyword == 'queue' or keyword == 'recent-added': | |
953 | try: | |
954 | q = _list2dict(bits) | |
955 | except: | |
956 | return self.invalid(line) | |
957 | if keyword == 'queue': | |
958 | return self.queue(q) | |
959 | if keyword == 'recent-added': | |
960 | return self.recent_added(q) | |
961 | elif keyword == 'recent-removed': | |
962 | if len(bits) == 1: | |
963 | return self.recent_removed(bits[0]) | |
964 | elif keyword == 'removed': | |
965 | if len(bits) == 1: | |
966 | return self.removed(bits[0], None) | |
967 | elif len(bits) == 2: | |
968 | return self.removed(bits[0], bits[1]) | |
969 | elif keyword == 'scratched': | |
970 | if len(bits) == 2: | |
971 | return self.scratched(bits[0], bits[1]) | |
972 | return self.invalid(line) | |
973 | ||
974 | def completed(self, track): | |
975 | """Called when a track completes. | |
976 | ||
977 | Arguments: | |
978 | track -- track that completed""" | |
979 | return True | |
980 | ||
981 | def failed(self, track, error): | |
982 | """Called when a player suffers an error. | |
983 | ||
984 | Arguments: | |
985 | track -- track that failed | |
986 | error -- error indicator""" | |
987 | return True | |
988 | ||
989 | def moved(self, id, offset, user): | |
990 | """Called when a track is moved in the queue. | |
991 | ||
992 | Arguments: | |
993 | id -- queue entry ID | |
994 | offset -- distance moved | |
995 | user -- user responsible""" | |
996 | return True | |
997 | ||
998 | def playing(self, track, user): | |
999 | """Called when a track starts playing. | |
1000 | ||
1001 | Arguments: | |
1002 | track -- track that has started | |
1003 | user -- user that submitted track, or None""" | |
1004 | return True | |
1005 | ||
1006 | def queue(self, q): | |
1007 | """Called when a track is added to the queue. | |
1008 | ||
1009 | Arguments: | |
1010 | q -- dictionary of new queue entry""" | |
1011 | return True | |
1012 | ||
1013 | def recent_added(self, q): | |
1014 | """Called when a track is added to the recently played list | |
1015 | ||
1016 | Arguments: | |
1017 | q -- dictionary of new queue entry""" | |
1018 | return True | |
1019 | ||
1020 | def recent_removed(self, id): | |
1021 | """Called when a track is removed from the recently played list | |
1022 | ||
1023 | Arguments: | |
1024 | id -- ID of removed entry (always the oldest)""" | |
1025 | return True | |
1026 | ||
1027 | def removed(self, id, user): | |
1028 | """Called when a track is removed from the queue, either manually | |
1029 | or in order to play it. | |
1030 | ||
1031 | Arguments: | |
1032 | id -- ID of removed entry | |
1033 | user -- user responsible (or None if we're playing this track)""" | |
1034 | return True | |
1035 | ||
1036 | def scratched(self, track, user): | |
1037 | """Called when a track is scratched | |
1038 | ||
1039 | Arguments: | |
1040 | track -- track that was scratched | |
1041 | user -- user responsible""" | |
1042 | return True | |
1043 | ||
1044 | def invalid(self, line): | |
1045 | """Called when an event log line cannot be interpreted | |
1046 | ||
1047 | Arguments: | |
1048 | line -- line that could not be understood""" | |
1049 | return True | |
1050 | ||
1051 | # Local Variables: | |
1052 | # mode:python | |
1053 | # py-indent-offset:2 | |
1054 | # comment-column:40 | |
1055 | # fill-column:72 | |
1056 | # End: |