sima/lib/webserv.py

   1 # -*- coding: utf-8 -*-
   2 # Copyright (c) 2009-2014 Jack Kaliko <kaliko@azylum.org>
   3 #
   4 #  This file is part of sima
   5 #
   6 #  sima is free software: you can redistribute it and/or modify
   7 #  it under the terms of the GNU General Public License as published by
   8 #  the Free Software Foundation, either version 3 of the License, or
   9 #  (at your option) any later version.
  10 #
  11 #  sima is distributed in the hope that it will be useful,
  12 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 #  GNU General Public License for more details.
  15 #
  16 #  You should have received a copy of the GNU General Public License
  17 #  along with sima.  If not, see <http://www.gnu.org/licenses/>.
  18 #
  19 #
  20 """
  21 Fetching similar artists from last.fm web services
  22 """
  23
  24 # standard library import
  25 import random
  26
  27 from collections import deque
  28 from hashlib import md5
  29
  30 # third parties components
  31
  32 # local import
  33 from .plugin import Plugin
  34 from .track import Track
  35 from .meta import Artist
  36 from ..utils.utils import WSError
  37
  38 def cache(func):
  39     """Caching decorator"""
  40     def wrapper(*args, **kwargs):
  41         #pylint: disable=W0212,C0111
  42         cls = args[0]
  43         similarities = [art for art in args[1]]
  44         hashedlst = md5(''.join(similarities).encode('utf-8')).hexdigest()
  45         if hashedlst in cls._cache.get('asearch'):
  46             cls.log.debug('cached request')
  47             results = cls._cache.get('asearch').get(hashedlst)
  48         else:
  49             results = func(*args, **kwargs)
  50             cls.log.debug('caching request')
  51             cls._cache.get('asearch').update({hashedlst:list(results)})
  52         random.shuffle(results)
  53         return results
  54     return wrapper
  55
  56
  57 class WebService(Plugin):
  58     """similar artists webservice
  59     """
  60
  61     def __init__(self, daemon):
  62         Plugin.__init__(self, daemon)
  63         self.daemon_conf = daemon.config
  64         self.sdb = daemon.sdb
  65         self.history = daemon.short_history
  66         ##
  67         self.to_add = list()
  68         self._cache = None
  69         self._flush_cache()
  70         wrapper = {
  71                 'track': self._track,
  72                 'top': self._top,
  73                 'album': self._album,
  74                 }
  75         self.queue_mode = wrapper.get(self.plugin_conf.get('queue_mode'))
  76         self.ws = None
  77
  78     def _flush_cache(self):
  79         """
  80         Both flushes and instanciates _cache
  81         """
  82         name = self.__class__.__name__
  83         if isinstance(self._cache, dict):
  84             self.log.info('{0}: Flushing cache!'.format(name))
  85         else:
  86             self.log.info('{0}: Initialising cache!'.format(name))
  87         self._cache = {
  88                 'asearch': dict(),
  89                 'tsearch': dict(),
  90                 }
  91
  92     def _cleanup_cache(self):
  93         """Avoid bloated cache
  94         """
  95         for _, val in self._cache.items():
  96             if isinstance(val, dict):
  97                 while len(val) > 150:
  98                     val.popitem()
  99
 100     def get_history(self, artist):
 101         """Constructs list of Track for already played titles for an artist.
 102         """
 103         duration = self.daemon_conf.getint('sima', 'history_duration')
 104         tracks_from_db = self.sdb.get_history(duration=duration, artist=artist)
 105         # Construct Track() objects list from database history
 106         played_tracks = [Track(artist=tr[-1], album=tr[1], title=tr[2],
 107                                file=tr[3]) for tr in tracks_from_db]
 108         return played_tracks
 109
 110     def filter_track(self, tracks):
 111         """
 112         Extract one unplayed track from a Track object list.
 113             * not in history
 114             * not already in the queue
 115             * not blacklisted
 116         """
 117         artist = tracks[0].artist
 118         black_list = self.player.queue + self.to_add
 119         not_in_hist = list(set(tracks) - set(self.get_history(artist=artist)))
 120         if self.plugin_conf.get('queue_mode') != 'top' and not not_in_hist:
 121             self.log.debug('All tracks already played for "{}"'.format(artist))
 122         random.shuffle(not_in_hist)
 123         candidate = []
 124         for trk in [_ for _ in not_in_hist if _ not in black_list]:
 125             # Should use albumartist heuristic as well
 126             if self.plugin_conf.getboolean('single_album'):
 127                 if (trk.album == self.player.current.album or
 128                     trk.album in [tr.album for tr in self.to_add]):
 129                     self.log.debug('Found unplayed track ' +
 130                                'but from an album already queued: %s' % (trk))
 131                     continue
 132             candidate.append(trk)
 133         if not candidate:
 134             return False
 135         self.to_add.append(random.choice(candidate))
 136         return True
 137
 138     def _get_artists_list_reorg(self, alist):
 139         """
 140         Move around items in artists_list in order to play first not recently
 141         played artists
 142         """
 143         # TODO: move to utils as a decorator
 144         duration = self.daemon_conf.getint('sima', 'history_duration')
 145         art_in_hist = list()
 146         for trk in self.sdb.get_history(duration=duration,
 147                                         artists=alist):
 148             if trk[0] not in art_in_hist:
 149                 art_in_hist.append(trk[0])
 150         art_in_hist.reverse()
 151         art_not_in_hist = [ar for ar in alist if ar not in art_in_hist]
 152         random.shuffle(art_not_in_hist)
 153         art_not_in_hist.extend(art_in_hist)
 154         self.log.info('{}'.format(
 155                        ' / '.join(art_not_in_hist)))
 156         return art_not_in_hist
 157
 158     @cache
 159     def get_artists_from_player(self, similarities):
 160         """
 161         Look in player library for availability of similar artists in
 162         similarities
 163         """
 164         dynamic = self.plugin_conf.getint('max_art')
 165         if dynamic <= 0:
 166             dynamic = 100
 167         results = list()
 168         similarities.reverse()
 169         while (len(results) < dynamic
 170             and len(similarities) > 0):
 171             art_pop = similarities.pop()
 172             results.extend(self.player.fuzzy_find_artist(art_pop))
 173         return results
 174
 175     def ws_similar_artists(self, artist=None):
 176         """
 177         Retrieve similar artists from WebServive.
 178         """
 179         if artist is None:
 180             curr = self.player.current.__dict__
 181             name = curr.get('artist')
 182             mbid = curr.get('musicbrainz_artistid', None)
 183             current = Artist(name=name, mbid=mbid)
 184         else:
 185             current = artist
 186         # initialize artists deque list to construct from DB
 187         as_art = deque()
 188         as_artists = self.ws().get_similar(artist=current)
 189         self.log.debug('Requesting {1} for "{0}"'.format(current,
 190                         self.ws.name))
 191         try:
 192             # TODO: let's propagate Artist type
 193             [as_art.append(str(art)) for art in as_artists]
 194         except WSError as err:
 195             self.log.warning('{0}: {1}'.format(self.ws.name, err))
 196         if as_art:
 197             self.log.debug('Fetched {0} artist(s)'.format(len(as_art)))
 198         return as_art
 199
 200     def get_recursive_similar_artist(self):
 201         ret_extra = list()
 202         history = deque(self.history)
 203         history.popleft()
 204         depth = 0
 205         current = self.player.current
 206         extra_arts = list()
 207         while depth < self.plugin_conf.getint('depth'):
 208             if len(history) == 0:
 209                 break
 210             trk = history.popleft()
 211             if (trk.artist in [trk.artist for trk in extra_arts]
 212                 or trk.artist == current.artist):
 213                 continue
 214             extra_arts.append(trk)
 215             depth += 1
 216         self.log.info('EXTRA ARTS: {}'.format(
 217             '/'.join([trk.artist for trk in extra_arts])))
 218         for artist in extra_arts:
 219             self.log.debug(
 220                     'Looking for artist similar to "{0.artist}" as well'.format(
 221                         artist))
 222             similar = self.ws_similar_artists(artist=artist)
 223             if not similar:
 224                 return ret_extra
 225             ret_extra.extend(self.get_artists_from_player(similar))
 226             if current.artist in ret_extra:
 227                 ret_extra.remove(current.artist)
 228         return ret_extra
 229
 230     def get_local_similar_artists(self):
 231         """Check against local player for similar artists
 232         """
 233         current = self.player.current
 234         self.log.info('Looking for artist similar to "{0.artist}"'.format(current))
 235         similar = self.ws_similar_artists()
 236         if not similar:
 237             self.log.info('Got nothing from {0}!'.format(self.ws.name))
 238             return []
 239         self.log.info('First five similar artist(s): {}...'.format(
 240                       ' / '.join([a for a in list(similar)[0:5]])))
 241         self.log.info('Looking availability in music library')
 242         ret = self.get_artists_from_player(similar)
 243         ret_extra = None
 244         if len(self.history) >= 2:
 245             if self.plugin_conf.getint('depth') > 1:
 246                 ret_extra = self.get_recursive_similar_artist()
 247         if ret_extra:
 248             ret = list(set(ret) | set(ret_extra))
 249         if not ret:
 250             self.log.warning('Got nothing from music library.')
 251             self.log.warning('Try running in debug mode to guess why...')
 252             return []
 253         self.log.info('Got {} artists in library'.format(len(ret)))
 254         # Move around similars items to get in unplayed|not recently played
 255         # artist first.
 256         return self._get_artists_list_reorg(ret)
 257
 258     def _get_album_history(self, artist=None):
 259         """Retrieve album history"""
 260         duration = self.daemon_conf.getint('sima', 'history_duration')
 261         albums_list = set()
 262         for trk in self.sdb.get_history(artist=artist, duration=duration):
 263             albums_list.add(trk[1])
 264         return albums_list
 265
 266     def find_album(self, artists):
 267         """Find albums to queue.
 268         """
 269         self.to_add = list()
 270         nb_album_add = 0
 271         target_album_to_add = self.plugin_conf.getint('album_to_add')
 272         for artist in artists:
 273             self.log.info('Looking for an album to add for "%s"...' % artist)
 274             albums = self.player.find_albums(artist)
 275             # str conversion while Album type is not propagated
 276             albums = [str(album) for album in albums]
 277             if albums:
 278                 self.log.debug('Albums candidate: {0:s}'.format(
 279                                ' / '.join(albums)))
 280             else: continue
 281             # albums yet in history for this artist
 282             albums = set(albums)
 283             albums_yet_in_hist = albums & self._get_album_history(artist=artist)
 284             albums_not_in_hist = list(albums - albums_yet_in_hist)
 285             # Get to next artist if there are no unplayed albums
 286             if not albums_not_in_hist:
 287                 self.log.info('No album found for "%s"' % artist)
 288                 continue
 289             album_to_queue = str()
 290             random.shuffle(albums_not_in_hist)
 291             for album in albums_not_in_hist:
 292                 tracks = self.player.find_album(artist, album)
 293                 # Look if one track of the album is already queued
 294                 # Good heuristic, at least enough to guess if the whole album is
 295                 # already queued.
 296                 if tracks[0] in self.player.queue:
 297                     self.log.debug('"%s" already queued, skipping!' %
 298                             tracks[0].album)
 299                     continue
 300                 album_to_queue = album
 301             if not album_to_queue:
 302                 self.log.info('No album found for "%s"' % artist)
 303                 continue
 304             self.log.info('{2} album candidate: {0} - {1}'.format(
 305                            artist, album_to_queue, self.ws.name))
 306             nb_album_add += 1
 307             self.to_add.extend(self.player.find_album(artist, album_to_queue))
 308             if nb_album_add == target_album_to_add:
 309                 return True
 310
 311     def find_top(self, artists):
 312         """
 313         find top tracks for artists in artists list.
 314         """
 315         self.to_add = list()
 316         nbtracks_target = self.plugin_conf.getint('track_to_add')
 317         webserv = self.ws()
 318         for artist in artists:
 319             artist = Artist(name=artist)
 320             if len(self.to_add) == nbtracks_target:
 321                 return True
 322             self.log.info('Looking for a top track for {0}'.format(artist))
 323             titles = deque()
 324             try:
 325                 titles = [t for t in webserv.get_toptrack(artist)]
 326             except WSError as err:
 327                 self.log.warning('{0}: {1}'.format(self.ws.name, err))
 328             if self.ws.ratelimit:
 329                 self.log.info('{0.name} ratelimit: {0.ratelimit}'.format(self.ws))
 330             for trk in titles:
 331                 found = self.player.fuzzy_find_track(artist.name, trk.title)
 332                 if found:
 333                     self.log.debug('{0}'.format(found[0]))
 334                     if self.filter_track(found):
 335                         break
 336
 337     def _track(self):
 338         """Get some tracks for track queue mode
 339         """
 340         artists = self.get_local_similar_artists()
 341         nbtracks_target = self.plugin_conf.getint('track_to_add')
 342         for artist in artists:
 343             self.log.debug('Trying to find titles to add for "{}"'.format(
 344                            artist))
 345             found = self.player.find_track(artist)
 346             if not found:
 347                 self.log.debug('Found nothing to queue for {0}'.format(artist))
 348                 continue
 349             # find tracks not in history for artist
 350             self.filter_track(found)
 351             if len(self.to_add) == nbtracks_target:
 352                 break
 353         if not self.to_add:
 354             self.log.debug('Found no tracks to queue, is your ' +
 355                             'history getting too large?')
 356             return None
 357         for track in self.to_add:
 358             self.log.info('{1} candidates: {0!s}'.format(track, self.ws.name))
 359
 360     def _album(self):
 361         """Get albums for album queue mode
 362         """
 363         artists = self.get_local_similar_artists()
 364         self.find_album(artists)
 365
 366     def _top(self):
 367         """Get some tracks for top track queue mode
 368         """
 369         artists = self.get_local_similar_artists()
 370         self.find_top(artists)
 371         for track in self.to_add:
 372             self.log.info('{1} candidates: {0!s}'.format(track, self.ws.name))
 373
 374     def callback_need_track(self):
 375         self._cleanup_cache()
 376         if not self.player.current:
 377             self.log.info('No current track, cannot queue')
 378             return None
 379         if not self.player.current.artist:
 380             self.log.warning('No artist set for the current track')
 381             self.log.debug(repr(self.player.current))
 382             return None
 383         self.queue_mode()
 384         msg = ' '.join(['{0}: {1:>3d}'.format(k, v) for
 385                         k, v in sorted(self.ws.stats.items())])
 386         self.log.debug(msg)
 387         candidates = self.to_add
 388         self.to_add = list()
 389         if self.plugin_conf.get('queue_mode') != 'album':
 390             random.shuffle(candidates)
 391         return candidates
 392
 393     def callback_player_database(self):
 394         self._flush_cache()
 395
 396 # VIM MODLINE
 397 # vim: ai ts=4 sw=4 sts=4 expandtab