sima/plugins/internal/lastfm.py

   1 # -*- coding: utf-8 -*-
   2 """
   3 Fetching similar artists from last.fm web services
   4 """
   5
   6 # standard library import
   7 import random
   8
   9 from collections import deque
  10 from hashlib import md5
  11
  12 # third parties components
  13
  14 # local import
  15 from ...lib.plugin import Plugin
  16 from ...lib.simafm import SimaFM, WSError
  17 from ...lib.track import Track
  18 from ...lib.meta import Artist
  19
  20
  21 def cache(func):
  22     """Caching decorator"""
  23     def wrapper(*args, **kwargs):
  24         #pylint: disable=W0212,C0111
  25         cls = args[0]
  26         similarities = [art for art, _ in args[1]]
  27         hashedlst = md5(''.join(similarities).encode('utf-8')).hexdigest()
  28         if hashedlst in cls._cache.get('asearch'):
  29             cls.log.debug('cached request')
  30             results = cls._cache.get('asearch').get(hashedlst)
  31         else:
  32             results = func(*args, **kwargs)
  33             cls.log.debug('caching request')
  34             cls._cache.get('asearch').update({hashedlst:list(results)})
  35         random.shuffle(results)
  36         return results
  37     return wrapper
  38
  39
  40 class Lastfm(Plugin):
  41     """last.fm similar artists
  42     """
  43
  44     def __init__(self, daemon):
  45         Plugin.__init__(self, daemon)
  46         self.daemon_conf = daemon.config
  47         self.sdb = daemon.sdb
  48         self.history = daemon.short_history
  49         ##
  50         self.to_add = list()
  51         self._cache = None
  52         self._flush_cache()
  53         wrapper = {
  54                 'track': self._track,
  55                 'top': self._top,
  56                 'album': self._album,
  57                 }
  58         self.queue_mode = wrapper.get(self.plugin_conf.get('queue_mode'))
  59
  60     def _flush_cache(self):
  61         """
  62         Both flushes and instanciates _cache
  63         """
  64         name = self.__class__.__name__
  65         if isinstance(self._cache, dict):
  66             self.log.info('{0}: Flushing cache!'.format(name))
  67         else:
  68             self.log.info('{0}: Initialising cache!'.format(name))
  69         self._cache = {
  70                 'asearch': dict(),
  71                 'tsearch': dict(),
  72                 }
  73
  74     def _cleanup_cache(self):
  75         """Avoid bloated cache
  76         """
  77         for _ , val in self._cache.items():
  78             if isinstance(val, dict):
  79                 while len(val) > 150:
  80                     val.popitem()
  81
  82     def get_history(self, artist):
  83         """Constructs list of Track for already played titles for an artist.
  84         """
  85         duration = self.daemon_conf.getint('sima', 'history_duration')
  86         tracks_from_db = self.sdb.get_history(duration=duration, artist=artist)
  87         # Construct Track() objects list from database history
  88         played_tracks = [Track(artist=tr[-1], album=tr[1], title=tr[2],
  89                                file=tr[3]) for tr in tracks_from_db]
  90         return played_tracks
  91
  92     def filter_track(self, tracks):
  93         """
  94         Extract one unplayed track from a Track object list.
  95             * not in history
  96             * not already in the queue
  97             * not blacklisted
  98         """
  99         artist = tracks[0].artist
 100         black_list = self.player.queue + self.to_add
 101         not_in_hist = list(set(tracks) - set(self.get_history(artist=artist)))
 102         if not not_in_hist:
 103             self.log.debug('All tracks already played for "{}"'.format(artist))
 104         random.shuffle(not_in_hist)
 105         #candidate = [ trk for trk in not_in_hist if trk not in black_list
 106                       #if not self.sdb.get_bl_track(trk, add_not=True)]
 107         candidate = []
 108         for trk in [_ for _ in not_in_hist if _ not in black_list]:
 109             if self.sdb.get_bl_track(trk, add_not=True):
 110                 self.log.info('Blacklisted: {0}: '.format(trk))
 111                 continue
 112             if self.sdb.get_bl_album(trk, add_not=True):
 113                 self.log.info('Blacklisted album: {0}: '.format(trk))
 114                 continue
 115             # Should use albumartist heuristic as well
 116             if self.plugin_conf.getboolean('single_album'):
 117                 if (trk.album == self.player.current.album or
 118                     trk.album in [tr.album for tr in self.to_add]):
 119                     self.log.debug('Found unplayed track ' +
 120                                'but from an album already queued: %s' % (trk))
 121                     continue
 122             candidate.append(trk)
 123         if not candidate:
 124             self.log.debug('Unable to find title to add' +
 125                            ' for "%s".' % artist)
 126             return None
 127         self.to_add.append(random.choice(candidate))
 128
 129     def _get_artists_list_reorg(self, alist):
 130         """
 131         Move around items in artists_list in order to play first not recently
 132         played artists
 133         """
 134         # TODO: move to utils as a decorator
 135         duration = self.daemon_conf.getint('sima', 'history_duration')
 136         art_in_hist = list()
 137         for trk in self.sdb.get_history(duration=duration,
 138                                         artists=alist):
 139             if trk[0] not in art_in_hist:
 140                 art_in_hist.append(trk[0])
 141         art_in_hist.reverse()
 142         art_not_in_hist = [ ar for ar in alist if ar not in art_in_hist ]
 143         random.shuffle(art_not_in_hist)
 144         art_not_in_hist.extend(art_in_hist)
 145         self.log.debug('history ordered: {}'.format(
 146                        ' / '.join(art_not_in_hist)))
 147         return art_not_in_hist
 148
 149     @cache
 150     def get_artists_from_player(self, similarities):
 151         """
 152         Look in player library for availability of similar artists in
 153         similarities
 154         """
 155         dynamic = self.plugin_conf.getint('dynamic')
 156         if dynamic <= 0:
 157             dynamic = 100
 158         similarity = self.plugin_conf.getint('similarity')
 159         results = list()
 160         similarities.reverse()
 161         while (len(results) < dynamic
 162             and len(similarities) > 0):
 163             art_pop, match = similarities.pop()
 164             if match < similarity:
 165                 break
 166             results.extend(self.player.fuzzy_find_artist(art_pop))
 167         results and self.log.debug('Similarity: %d%%' % match) # pylint: disable=w0106
 168         return results
 169
 170     def lfm_similar_artists(self, artist=None):
 171         """
 172         Retrieve similar artists on last.fm server.
 173         """
 174         if artist is None:
 175             curr = self.player.current.__dict__
 176             name = curr.get('artist')
 177             mbid = curr.get('musicbrainz_artistid', None)
 178             current = Artist(name=name, mbid=mbid)
 179         else:
 180             current = artist
 181         simafm = SimaFM()
 182         # initialize artists deque list to construct from DB
 183         as_art = deque()
 184         as_artists = simafm.get_similar(artist=current)
 185         self.log.debug('Requesting last.fm for "{0}"'.format(current))
 186         try:
 187             # TODO: let's propagate Artist type
 188             [as_art.append((str(a), m)) for a, m in as_artists]
 189         except WSError as err:
 190             self.log.warning('Last.fm: {0}'.format(err))
 191         if as_art:
 192             self.log.debug('Fetched {0} artist(s)'.format(len(as_art)))
 193         return as_art
 194
 195     def get_recursive_similar_artist(self):
 196         ret_extra = list()
 197         history = deque(self.history)
 198         history.popleft()
 199         depth = 0
 200         current = self.player.current
 201         extra_arts = list()
 202         while depth < self.plugin_conf.getint('depth'):
 203             if len(history) == 0:
 204                 break
 205             trk = history.popleft()
 206             if (trk.artist in [trk.artist for trk in extra_arts]
 207                 or trk.artist == current.artist):
 208                 continue
 209             extra_arts.append(trk)
 210             depth += 1
 211         self.log.info('EXTRA ARTS: {}'.format(
 212             '/'.join([trk.artist for trk in extra_arts])))
 213         for artist in extra_arts:
 214             self.log.debug('Looking for artist similar to "{0.artist}" as well'.format(artist))
 215             similar = self.lfm_similar_artists(artist=artist)
 216             if not similar:
 217                 return ret_extra
 218             similar = sorted(similar, key=lambda sim: sim[1], reverse=True)
 219             ret_extra.extend(self.get_artists_from_player(similar))
 220             if current.artist in ret_extra:
 221                 ret_extra.remove(current.artist)
 222         return ret_extra
 223
 224     def get_local_similar_artists(self):
 225         """Check against local player for similar artists fetched from last.fm
 226         """
 227         current = self.player.current
 228         self.log.info('Looking for artist similar to "{0.artist}"'.format(current))
 229         similar = self.lfm_similar_artists()
 230         if not similar:
 231             self.log.info('Got nothing from last.fm!')
 232             return []
 233         similar = sorted(similar, key=lambda sim: sim[1], reverse=True)
 234         self.log.info('First five similar artist(s): {}...'.format(
 235                       ' / '.join([a for a, _ in similar[0:5]])))
 236         self.log.info('Looking availability in music library')
 237         ret = self.get_artists_from_player(similar)
 238         ret_extra = None
 239         if len(self.history) >= 2:
 240             if self.plugin_conf.getint('depth') > 1:
 241                 ret_extra = self.get_recursive_similar_artist()
 242         if ret_extra:
 243             ret = list(set(ret) | set(ret_extra))
 244         if not ret:
 245             self.log.warning('Got nothing from music library.')
 246             self.log.warning('Try running in debug mode to guess why...')
 247             return []
 248         self.log.info('Got {} artists in library'.format(len(ret)))
 249         self.log.info(' / '.join(ret))
 250         # Move around similars items to get in unplayed|not recently played
 251         # artist first.
 252         return self._get_artists_list_reorg(ret)
 253
 254     def _get_album_history(self, artist=None):
 255         """Retrieve album history"""
 256         duration = self.daemon_conf.getint('sima', 'history_duration')
 257         albums_list = set()
 258         for trk in self.sdb.get_history(artist=artist, duration=duration):
 259             albums_list.add(trk[1])
 260         return albums_list
 261
 262     def find_album(self, artists):
 263         """Find albums to queue.
 264         """
 265         self.to_add = list()
 266         nb_album_add = 0
 267         target_album_to_add = self.plugin_conf.getint('album_to_add')
 268         for artist in artists:
 269             self.log.info('Looking for an album to add for "%s"...' % artist)
 270             albums = self.player.find_albums(artist)
 271             # str conversion while Album type is not propagated
 272             albums = [ str(album) for album in albums]
 273             if albums:
 274                 self.log.debug('Albums candidate: {0:s}'.format(' / '.join(albums)))
 275             else: continue
 276             # albums yet in history for this artist
 277             albums = set(albums)
 278             albums_yet_in_hist = albums & self._get_album_history(artist=artist)
 279             albums_not_in_hist = list(albums - albums_yet_in_hist)
 280             # Get to next artist if there are no unplayed albums
 281             if not albums_not_in_hist:
 282                 self.log.info('No album found for "%s"' % artist)
 283                 continue
 284             album_to_queue = str()
 285             random.shuffle(albums_not_in_hist)
 286             for album in albums_not_in_hist:
 287                 tracks = self.player.find_album(artist, album)
 288                 # Look if one track of the album is already queued
 289                 # Good heuristic, at least enough to guess if the whole album is
 290                 # already queued.
 291                 if tracks[0] in self.player.queue:
 292                     self.log.debug('"%s" already queued, skipping!' %
 293                             tracks[0].album)
 294                     continue
 295                 album_to_queue = album
 296             if not album_to_queue:
 297                 self.log.info('No album found for "%s"' % artist)
 298                 continue
 299             self.log.info('last.fm album candidate: {0} - {1}'.format(
 300                            artist, album_to_queue))
 301             nb_album_add += 1
 302             self.to_add.extend(self.player.find_album(artist, album_to_queue))
 303             if nb_album_add == target_album_to_add:
 304                 return True
 305
 306     def _track(self):
 307         """Get some tracks for track queue mode
 308         """
 309         artists = self.get_local_similar_artists()
 310         nbtracks_target = self.plugin_conf.getint('track_to_add')
 311         for artist in artists:
 312             self.log.debug('Trying to find titles to add for "{}"'.format(
 313                            artist))
 314             found = self.player.find_track(artist)
 315             # find tracks not in history for artist
 316             self.filter_track(found)
 317             if len(self.to_add) == nbtracks_target:
 318                 break
 319         if not self.to_add:
 320             self.log.debug('Found no tracks to queue, is your ' +
 321                             'history getting too large?')
 322             return None
 323         for track in self.to_add:
 324             self.log.info('last.fm candidates: {0!s}'.format(track))
 325
 326     def _album(self):
 327         """Get albums for album queue mode
 328         """
 329         artists = self.get_local_similar_artists()
 330         self.find_album(artists)
 331
 332     def _top(self):
 333         """Get some tracks for top track queue mode
 334         """
 335         #artists = self.get_local_similar_artists()
 336         pass
 337
 338     def callback_need_track(self):
 339         self._cleanup_cache()
 340         if not self.player.current:
 341             self.log.info('No current track, cannot queue')
 342             return None
 343         if not self.player.current.artist:
 344             self.log.warning('No artist set for the current track')
 345             self.log.debug(repr(self.player.current))
 346             return None
 347         self.queue_mode()
 348         candidates = self.to_add
 349         self.to_add = list()
 350         if self.plugin_conf.get('queue_mode') != 'album':
 351             random.shuffle(candidates)
 352         return candidates
 353
 354     def callback_player_database(self):
 355         self._flush_cache()
 356
 357 # VIM MODLINE
 358 # vim: ai ts=4 sw=4 sts=4 expandtab