sima/lib/webserv.py

   1 # -*- coding: utf-8 -*-
   2 # Copyright (c) 2009-2015 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, MetaContainer
  36 from ..utils.utils import WSError, WSNotFound
  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.name 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     # pylint: disable=bad-builtin
  61
  62     def __init__(self, daemon):
  63         Plugin.__init__(self, daemon)
  64         self.daemon_conf = daemon.config
  65         self.sdb = daemon.sdb
  66         self.history = daemon.short_history
  67         ##
  68         self.to_add = list()
  69         self._cache = None
  70         self._flush_cache()
  71         wrapper = {'track': self._track,
  72                    'top': self._top,
  73                    'album': self._album,}
  74         self.queue_mode = wrapper.get(self.plugin_conf.get('queue_mode'))
  75         self.ws = None
  76
  77     def _flush_cache(self):
  78         """
  79         Both flushes and instanciates _cache
  80         """
  81         name = self.__class__.__name__
  82         if isinstance(self._cache, dict):
  83             self.log.info('{0}: Flushing cache!'.format(name))
  84         else:
  85             self.log.info('{0}: Initialising cache!'.format(name))
  86         self._cache = {'asearch': dict(),
  87                        'tsearch': dict(),}
  88
  89     def _cleanup_cache(self):
  90         """Avoid bloated cache
  91         """
  92         for _, val in self._cache.items():
  93             if isinstance(val, dict):
  94                 while len(val) > 150:
  95                     val.popitem()
  96
  97     def get_history(self, artist):
  98         """Constructs list of Track for already played titles for an artist.
  99         """
 100         duration = self.daemon_conf.getint('sima', 'history_duration')
 101         tracks_from_db = self.sdb.get_history(duration=duration, artist=artist)
 102         # Construct Track() objects list from database history
 103         played_tracks = [Track(artist=tr[-1], album=tr[1], title=tr[2],
 104                                file=tr[3]) for tr in tracks_from_db]
 105         return played_tracks
 106
 107     def filter_track(self, tracks):
 108         """
 109         Extract one unplayed track from a Track object list.
 110             * not in history
 111             * not already in the queue
 112             * not blacklisted
 113         """
 114         artist = tracks[0].artist
 115         black_list = self.player.queue + self.to_add
 116         not_in_hist = list(set(tracks) - set(self.get_history(artist=artist)))
 117         if self.plugin_conf.get('queue_mode') != 'top' and not not_in_hist:
 118             self.log.debug('All tracks already played for "{}"'.format(artist))
 119         random.shuffle(not_in_hist)
 120         candidate = []
 121         for trk in [_ for _ in not_in_hist if _ not in black_list]:
 122             # Should use albumartist heuristic as well
 123             if self.plugin_conf.getboolean('single_album'): # pylint: disable=no-member
 124                 if (trk.album == self.player.current.album or
 125                         trk.album in [tr.album for tr in self.to_add]):
 126                     self.log.debug('Found unplayed track ' +
 127                                    'but from an album already queued: %s', trk)
 128                     continue
 129             candidate.append(trk)
 130         if not candidate:
 131             return False
 132         self.to_add.append(random.choice(candidate))
 133         return True
 134
 135     def _get_artists_list_reorg(self, alist):
 136         """
 137         Move around items in artists_list in order to play first not recently
 138         played artists
 139         """
 140         hist = list()
 141         duration = self.daemon_conf.getint('sima', 'history_duration')
 142         for art in self.sdb.get_artists_history(alist, duration=duration):
 143             if art not in hist:
 144                 hist.insert(0, art)
 145         reorg = [art for art in alist if art not in hist]
 146         reorg.extend(hist)
 147         return reorg
 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('max_art') # pylint: disable=no-member
 156         if dynamic <= 0:
 157             dynamic = 100
 158         results = list()
 159         similarities.reverse()
 160         while (len(results) < dynamic
 161                and len(similarities) > 0):
 162             art_pop = similarities.pop()
 163             res = self.player.search_artist(art_pop)
 164             if res:
 165                 results.append(res)
 166         return results
 167
 168     def ws_similar_artists(self, artist):
 169         """
 170         Retrieve similar artists from WebServive.
 171         """
 172         # initialize artists deque list to construct from DB
 173         as_art = deque()
 174         as_artists = self.ws.get_similar(artist=artist)
 175         self.log.debug('Requesting {} for {!r}'.format(self.ws.name, artist))
 176         try:
 177             [as_art.append(art) for art in as_artists]
 178         except WSNotFound as err:
 179             self.log.warning('{}: {}'.format(self.ws.name, err))
 180             if artist.mbid:
 181                 self.log.debug('Trying without MusicBrainzID')
 182                 try:
 183                     return self.ws_similar_artists(Artist(name=artist.name))
 184                 except WSNotFound as err:
 185                     self.log.debug('{}: {}'.format(self.ws.name, err))
 186         except WSError as err:
 187             self.log.warning('{}: {}'.format(self.ws.name, err))
 188         if as_art:
 189             self.log.debug('Fetched {} artist(s)'.format(len(as_art)))
 190         return as_art
 191
 192     def get_recursive_similar_artist(self):
 193         """Check against local player for similar artists (recursive w/ history)
 194         """
 195         if not self.player.playlist:
 196             return
 197         history = list(self.history)
 198         history = self.player.queue + history
 199         history = deque(history)
 200         last_trk = history.popleft() # remove
 201         extra_arts = list()
 202         ret_extra = list()
 203         depth = 0
 204         while depth < self.plugin_conf.getint('depth'): # pylint: disable=no-member
 205             if len(history) == 0:
 206                 break
 207             trk = history.popleft()
 208             if (trk.Artist in extra_arts
 209                     or trk.Artist == last_trk.Artist):
 210                 continue
 211             extra_arts.append(trk.Artist)
 212             depth += 1
 213         self.log.debug('EXTRA ARTS: %s', '/'.join(map(str, extra_arts)))
 214         for artist in extra_arts:
 215             self.log.debug('Looking for artist similar '
 216                            'to "{}" as well'.format(artist))
 217             similar = self.ws_similar_artists(artist=artist)
 218             if not similar:
 219                 continue
 220             ret_extra.extend(self.get_artists_from_player(similar))
 221
 222         if last_trk.Artist in ret_extra:
 223             ret_extra.remove(last_trk.Artist)
 224         if ret_extra:
 225             self.log.debug('similar artist(s) found: %s',
 226                            ' / '.join(map(str, MetaContainer(ret_extra))))
 227         return ret_extra
 228
 229     def get_local_similar_artists(self):
 230         """Check against local player for similar artists
 231         """
 232         if not self.player.playlist:
 233             return []
 234         tolookfor = self.player.playlist[-1].Artist
 235         self.log.info('Looking for artist similar to "{}"'.format(tolookfor))
 236         self.log.debug(repr(tolookfor))
 237         similar = self.ws_similar_artists(tolookfor)
 238         if not similar:
 239             self.log.info('Got nothing from {0}!'.format(self.ws.name))
 240             return []
 241         self.log.info('First five similar artist(s): %s...',
 242                       ' / '.join(map(str, list(similar)[:5])))
 243         self.log.info('Looking availability in music library')
 244         ret = MetaContainer(self.get_artists_from_player(similar))
 245         if ret:
 246             self.log.debug('regular found in library: %s',
 247                            ' / '.join(map(str, ret)))
 248         else:
 249             self.log.debug('Got nothing similar from library!')
 250         ret_extra = None
 251         if len(self.history) >= 2:
 252             if self.plugin_conf.getint('depth') > 1: # pylint: disable=no-member
 253                 ret_extra = self.get_recursive_similar_artist()
 254         if ret_extra:
 255             # get them reorg to pick up best element
 256             ret_extra = self._get_artists_list_reorg(ret_extra)
 257             # tries to pickup less artist from extra art
 258             if len(ret) < 4:
 259                 ret_extra = MetaContainer(ret_extra)
 260             else:
 261                 ret_extra = MetaContainer(ret_extra[:max(4, len(ret))//2])
 262             if ret_extra:
 263                 self.log.debug('extra found in library: %s',
 264                                ' / '.join(map(str, ret_extra)))
 265             ret = ret | ret_extra
 266         if not ret:
 267             self.log.warning('Got nothing from music library.')
 268             return []
 269         queued_artists = MetaContainer([trk.Artist for trk in self.player.queue])
 270         self.log.trace('Already queued: {}'.format(queued_artists))
 271         self.log.trace('Candidate: {}'.format(ret))
 272         if ret & queued_artists:
 273             self.log.debug('Removing already queued artists: '
 274                            '{0}'.format('/'.join(map(str, ret & queued_artists))))
 275             ret = ret - queued_artists
 276         if self.player.current and self.player.current.Artist in ret:
 277             self.log.debug('Removing current artist: {0}'.format(self.player.current.Artist))
 278             ret = ret -  MetaContainer([self.player.current.Artist])
 279         # Move around similars items to get in unplayed|not recently played
 280         # artist first.
 281         self.log.info('Got {} artists in library'.format(len(ret)))
 282         candidates = self._get_artists_list_reorg(list(ret))
 283         if candidates:
 284             self.log.info(' / '.join(map(str, candidates)))
 285         return candidates
 286
 287     def _get_album_history(self, artist=None):
 288         """Retrieve album history"""
 289         duration = self.daemon_conf.getint('sima', 'history_duration')
 290         albums_list = set()
 291         for trk in self.sdb.get_history(artist=artist.name, duration=duration):
 292             albums_list.add(trk[1])
 293         return albums_list
 294
 295     def find_album(self, artists):
 296         """Find albums to queue.
 297         """
 298         self.to_add = list()
 299         nb_album_add = 0
 300         target_album_to_add = self.plugin_conf.getint('album_to_add') # pylint: disable=no-member
 301         for artist in artists:
 302             self.log.info('Looking for an album to add for "%s"...' % artist)
 303             albums = self.player.search_albums(artist)
 304             # str conversion while Album type is not propagated
 305             albums = [str(album) for album in albums]
 306             if albums:
 307                 self.log.debug('Albums candidate: %s', ' / '.join(albums))
 308             else: continue
 309             # albums yet in history for this artist
 310             albums = set(albums)
 311             albums_yet_in_hist = albums & self._get_album_history(artist=artist)
 312             albums_not_in_hist = list(albums - albums_yet_in_hist)
 313             # Get to next artist if there are no unplayed albums
 314             if not albums_not_in_hist:
 315                 self.log.info('No album found for "%s"' % artist)
 316                 continue
 317             album_to_queue = str()
 318             random.shuffle(albums_not_in_hist)
 319             for album in albums_not_in_hist:
 320                 tracks = self.player.find_album(artist, album)
 321                 # Look if one track of the album is already queued
 322                 # Good heuristic, at least enough to guess if the whole album is
 323                 # already queued.
 324                 if tracks[0] in self.player.queue:
 325                     self.log.debug('"%s" already queued, skipping!', tracks[0].album)
 326                     continue
 327                 album_to_queue = album
 328             if not album_to_queue:
 329                 self.log.info('No album found for "%s"', artist)
 330                 continue
 331             self.log.info('%s album candidate: %s - %s', self.ws.name, artist, album_to_queue)
 332             nb_album_add += 1
 333             self.to_add.extend(self.player.find_album(artist, album_to_queue))
 334             if nb_album_add == target_album_to_add:
 335                 return True
 336
 337     def find_top(self, artists):
 338         """
 339         find top tracks for artists in artists list.
 340         """
 341         self.to_add = list()
 342         nbtracks_target = self.plugin_conf.getint('track_to_add') # pylint: disable=no-member
 343         for artist in artists:
 344             if len(self.to_add) == nbtracks_target:
 345                 return True
 346             self.log.info('Looking for a top track for {0}'.format(artist))
 347             titles = deque()
 348             try:
 349                 titles = [t for t in self.ws.get_toptrack(artist)]
 350             except WSError as err:
 351                 self.log.warning('%s: %s', self.ws.name, err)
 352             for trk in titles:
 353                 found = self.player.fuzzy_find_track(artist, trk.title)
 354                 random.shuffle(found)
 355                 if found:
 356                     self.log.debug('%s', found[0])
 357                     if self.filter_track(found):
 358                         break
 359
 360     def _track(self):
 361         """Get some tracks for track queue mode
 362         """
 363         artists = self.get_local_similar_artists()
 364         nbtracks_target = self.plugin_conf.getint('track_to_add') # pylint: disable=no-member
 365         for artist in artists:
 366             self.log.debug('Trying to find titles to add for "%r"', artist)
 367             found = self.player.find_track(artist)
 368             random.shuffle(found)
 369             if not found:
 370                 self.log.debug('Found nothing to queue for {0}'.format(artist))
 371                 continue
 372             # find tracks not in history for artist
 373             self.filter_track(found)
 374             if len(self.to_add) == nbtracks_target:
 375                 break
 376         if not self.to_add:
 377             self.log.debug('Found no tracks to queue!')
 378             return None
 379         for track in self.to_add:
 380             self.log.info('{1} candidates: {0!s}'.format(track, self.ws.name))
 381
 382     def _album(self):
 383         """Get albums for album queue mode
 384         """
 385         artists = self.get_local_similar_artists()
 386         self.find_album(artists)
 387
 388     def _top(self):
 389         """Get some tracks for top track queue mode
 390         """
 391         artists = self.get_local_similar_artists()
 392         self.find_top(artists)
 393         for track in self.to_add:
 394             self.log.info('{1} candidates: {0!s}'.format(track, self.ws.name))
 395
 396     def callback_need_track(self):
 397         self._cleanup_cache()
 398         if len(self.player.playlist) == 0:
 399             self.log.info('No last track, cannot queue')
 400             return None
 401         if not self.player.playlist[-1].artist:
 402             self.log.warning('No artist set for the last track in queue')
 403             self.log.debug(repr(self.player.current))
 404             return None
 405         self.queue_mode()
 406         msg = ' '.join(['{0}: {1:>3d}'.format(k, v) for
 407                         k, v in sorted(self.ws.stats.items())])
 408         self.log.debug('http stats: ' + msg)
 409         candidates = self.to_add
 410         self.to_add = list()
 411         if self.plugin_conf.get('queue_mode') != 'album':
 412             random.shuffle(candidates)
 413         return candidates
 414
 415     def callback_player_database(self):
 416         self._flush_cache()
 417
 418 # VIM MODLINE
 419 # vim: ai ts=4 sw=4 sts=4 expandtab