sima/lib/webserv.py

   1 # -*- coding: utf-8 -*-
   2 # Copyright (c) 2009-2020 kaliko <kaliko@azylum.org>
   3 # Copyright (c) 2019 sacha <sachahony@gmail.com>
   4 #
   5 #  This file is part of sima
   6 #
   7 #  sima is free software: you can redistribute it and/or modify
   8 #  it under the terms of the GNU General Public License as published by
   9 #  the Free Software Foundation, either version 3 of the License, or
  10 #  (at your option) any later version.
  11 #
  12 #  sima is distributed in the hope that it will be useful,
  13 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 #  GNU General Public License for more details.
  16 #
  17 #  You should have received a copy of the GNU General Public License
  18 #  along with sima.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20 #
  21 """
  22 Fetching similar artists from last.fm web services
  23 """
  24
  25 # standard library import
  26 import random
  27
  28 from collections import deque
  29 from hashlib import md5
  30
  31 # third parties components
  32
  33 # local import
  34 from .plugin import AdvancedPlugin
  35 from .meta import Artist, MetaContainer
  36 from ..utils.utils import WSError, WSNotFound, WSTimeout
  37
  38
  39 def cache(func):
  40     """Caching decorator"""
  41     def wrapper(*args, **kwargs):
  42         #pylint: disable=W0212,C0111
  43         cls = args[0]
  44         similarities = [art.name for art in args[1]]
  45         hashedlst = md5(''.join(similarities).encode('utf-8')).hexdigest()
  46         if hashedlst in cls._cache.get('asearch'):
  47             cls.log.debug('cached request')
  48             results = cls._cache.get('asearch').get(hashedlst)
  49         else:
  50             results = func(*args, **kwargs)
  51             cls.log.debug('caching request')
  52             cls._cache.get('asearch').update({hashedlst: list(results)})
  53         random.shuffle(results)
  54         return results
  55     return wrapper
  56
  57
  58 class WebService(AdvancedPlugin):
  59     """similar artists webservice
  60     """
  61
  62     def __init__(self, daemon):
  63         super().__init__(daemon)
  64         self.history = daemon.short_history
  65         ##
  66         self._cache = None
  67         self._flush_cache()
  68         wrapper = {'track': self._track,
  69                    'top': self._top,
  70                    'album': self._album}
  71         self.queue_mode = wrapper.get(self.plugin_conf.get('queue_mode'))
  72         self.ws = None
  73         self.ws_retry = 0
  74
  75     def _flush_cache(self):
  76         """
  77         Both flushes and instanciates _cache
  78         """
  79         name = self.__class__.__name__
  80         if isinstance(self._cache, dict):
  81             self.log.info('%s: Flushing cache!', name)
  82         else:
  83             self.log.info('%s: Initialising cache!', name)
  84         self._cache = {'asearch': dict(),
  85                        'tsearch': dict()}
  86
  87     def _cleanup_cache(self):
  88         """Avoid bloated cache
  89         """
  90         for _, val in self._cache.items():
  91             if isinstance(val, dict):
  92                 while len(val) > 150:
  93                     val.popitem()
  94
  95     @cache
  96     def get_artists_from_player(self, similarities):
  97         """
  98         Look in player library for availability of similar artists in
  99         similarities
 100         """
 101         dynamic = self.plugin_conf.getint('max_art')
 102         if dynamic <= 0:
 103             dynamic = 100
 104         results = list()
 105         similarities.reverse()
 106         while (len(results) < dynamic and similarities):
 107             art_pop = similarities.pop()
 108             res = self.player.search_artist(art_pop)
 109             if res:
 110                 results.append(res)
 111         return results
 112
 113     def ws_similar_artists(self, artist):
 114         """
 115         Retrieve similar artists from WebServive.
 116         """
 117         # initialize artists deque list to construct from DB
 118         as_art = deque()
 119         as_artists = self.ws.get_similar(artist=artist)
 120         self.log.debug('Requesting %s for %r', self.ws.name, artist)
 121         try:
 122             [as_art.append(art) for art in as_artists]
 123         except WSNotFound as err:
 124             self.log.warning('%s: %s', self.ws.name, err)
 125             if artist.mbid:
 126                 self.log.debug('Trying without MusicBrainzID')
 127                 try:
 128                     return self.ws_similar_artists(Artist(name=artist.name))
 129                 except WSNotFound as err:
 130                     self.log.debug('%s: %s', self.ws.name, err)
 131         except WSTimeout as err:
 132             self.log.warning('%s: %s', self.ws.name, err)
 133             if self.ws_retry < 3:
 134                 self.ws_retry += 1
 135                 self.log.warning('%s: retrying', self.ws.name)
 136                 as_art = self.ws_similar_artists(artist)
 137             else:
 138                 self.log.warning('%s: stop retrying', self.ws.name)
 139             self.ws_retry = 0
 140         except WSError as err:
 141             self.log.warning('%s: %s', self.ws.name, err)
 142         if as_art:
 143             self.log.debug('Fetched %d artist(s)', len(as_art))
 144         return as_art
 145
 146     def get_recursive_similar_artist(self):
 147         """Check against local player for similar artists (recursive w/ history)
 148         """
 149         if not self.player.playlist:
 150             return []
 151         history = list(self.history)
 152         # In random play mode use complete playlist to filter
 153         if self.player.playmode.get('random'):
 154             history = self.player.playlist + history
 155         else:
 156             history = self.player.queue + history
 157         history = deque(history)
 158         last_trk = history.popleft()  # remove
 159         extra_arts = list()
 160         ret_extra = list()
 161         depth = 0
 162         while depth < self.plugin_conf.getint('depth'):
 163             if not history:
 164                 break
 165             trk = history.popleft()
 166             if (trk.Artist in extra_arts
 167                     or trk.Artist == last_trk.Artist):
 168                 continue
 169             extra_arts.append(trk.Artist)
 170             depth += 1
 171         self.log.debug('EXTRA ARTS: %s', '/'.join(map(str, extra_arts)))
 172         for artist in extra_arts:
 173             self.log.debug('Looking for artist similar '
 174                            'to "%s" as well', artist)
 175             similar = self.ws_similar_artists(artist=artist)
 176             if not similar:
 177                 continue
 178             ret_extra.extend(self.get_artists_from_player(similar))
 179
 180         if last_trk.Artist in ret_extra:
 181             ret_extra.remove(last_trk.Artist)
 182         if ret_extra:
 183             self.log.debug('similar artist(s) found: %s',
 184                            ' / '.join(map(str, MetaContainer(ret_extra))))
 185         return ret_extra
 186
 187     def get_local_similar_artists(self):
 188         """Check against local player for similar artists
 189         """
 190         if not self.player.playlist:
 191             return []
 192         tolookfor = self.player.playlist[-1].Artist
 193         self.log.info('Looking for artist similar to "%s"', tolookfor)
 194         self.log.debug('%r', tolookfor)
 195         similar = self.ws_similar_artists(tolookfor)
 196         if not similar:
 197             self.log.info('Got nothing from %s!', self.ws.name)
 198             return []
 199         self.log.info('First five similar artist(s): %s...',
 200                       ' / '.join(map(str, list(similar)[:5])))
 201         self.log.info('Looking availability in music library')
 202         ret = MetaContainer(self.get_artists_from_player(similar))
 203         if ret:
 204             self.log.debug('regular found in library: %s',
 205                            ' / '.join(map(str, ret)))
 206         else:
 207             self.log.debug('Got nothing similar from library!')
 208         ret_extra = None
 209         if len(self.history) >= 2:
 210             if self.plugin_conf.getint('depth') > 1:
 211                 ret_extra = self.get_recursive_similar_artist()
 212         if ret_extra:
 213             # get them reorg to pick up best element
 214             ret_extra = self.get_reorg_artists_list(ret_extra)
 215             # tries to pickup less artist from extra art
 216             if len(ret) > 4:
 217                 ret_extra = MetaContainer(ret_extra[:max(4, len(ret))//2])
 218             if ret_extra:
 219                 self.log.debug('extra found in library: %s',
 220                                ' / '.join(map(str, ret_extra)))
 221             ret = ret | ret_extra
 222         if not ret:
 223             self.log.warning('Got nothing from music library.')
 224             return []
 225         # In random play mode use complete playlist to filter
 226         if self.player.playmode.get('random'):
 227             queued_artists = MetaContainer([trk.Artist for trk
 228                                             in self.player.playlist])
 229         else:
 230             queued_artists = MetaContainer([trk.Artist for trk
 231                                             in self.player.queue])
 232         self.log.trace('Already queued: %s', queued_artists)
 233         self.log.trace('Candidate: %s', ret)
 234         if ret & queued_artists:
 235             self.log.debug('Removing already queued artists: '
 236                            '%s', '/'.join(map(str, ret & queued_artists)))
 237             ret = ret - queued_artists
 238         current = self.player.current
 239         if current and current.Artist in ret:
 240             self.log.debug('Removing current artist: %s', current.Artist)
 241             ret = ret - MetaContainer([current.Artist])
 242         # Move around similars items to get in unplayed|not recently played
 243         # artist first.
 244         self.log.info('Got %d artists in library', len(ret))
 245         candidates = self.get_reorg_artists_list(ret)
 246         if candidates:
 247             self.log.info(' / '.join(map(str, candidates)))
 248         return candidates
 249
 250     def find_album(self, artists):
 251         """Find albums to queue.
 252         """
 253         to_add = list()
 254         nb_album_add = 0
 255         target_album_to_add = self.plugin_conf.getint('album_to_add')
 256         for artist in artists:
 257             album = self.album_candidate(artist, unplayed=True)
 258             if not album:
 259                 continue
 260             nb_album_add += 1
 261             candidates = self.player.find_tracks(album)
 262             if not candidates:
 263                 continue
 264             if self.plugin_conf.getboolean('shuffle_album'):
 265                 random.shuffle(candidates)
 266             # this allows to select a maximum number of track from the album
 267             # a value of 0 (default) means keep all
 268             nbtracks = self.plugin_conf.getint('track_to_add_from_album')
 269             if nbtracks > 0:
 270                 candidates = candidates[0:nbtracks]
 271             to_add.extend(candidates)
 272             if nb_album_add == target_album_to_add:
 273                 return to_add
 274
 275     def find_top(self, artists):
 276         """
 277         find top tracks for artists in artists list.
 278         """
 279         to_add = list()
 280         nbtracks_target = self.plugin_conf.getint('track_to_add')
 281         for artist in artists:
 282             if len(to_add) == nbtracks_target:
 283                 return to_add
 284             self.log.info('Looking for a top track for %s', artist)
 285             titles = deque()
 286             try:
 287                 titles = [t for t in self.ws.get_toptrack(artist)]
 288             except WSError as err:
 289                 self.log.warning('%s: %s', self.ws.name, err)
 290                 continue
 291             for trk in titles:
 292                 found = self.player.search_track(artist, trk.title)
 293                 if found:
 294                     random.shuffle(found)
 295                     top_trk = self.filter_track(found, to_add)
 296                     if top_trk:
 297                         to_add.append(top_trk)
 298                         break
 299
 300     def _track(self):
 301         """Get some tracks for track queue mode
 302
 303         :return: list of Tracks
 304         """
 305         to_add = []
 306         artists = self.get_local_similar_artists()
 307         nbtracks_target = self.plugin_conf.getint('track_to_add')
 308         for artist in artists:
 309             self.log.debug('Trying to find titles to add for "%r"', artist)
 310             found = self.player.find_tracks(artist)
 311             if not found:
 312                 self.log.debug('Found nothing to queue for %s', artist)
 313                 continue
 314             random.shuffle(found)
 315             # find tracks not in history for artist
 316             track_candidate = self.filter_track(found, to_add)
 317             if track_candidate:
 318                 to_add.append(track_candidate)
 319                 self.log.info('%s plugin chose: %s',
 320                               self.ws.name, track_candidate)
 321             if len(to_add) == nbtracks_target:
 322                 break
 323         return to_add
 324
 325     def _album(self):
 326         """Get albums for album queue mode
 327
 328         :return: list of Tracks
 329         """
 330         artists = self.get_local_similar_artists()
 331         return self.find_album(artists)
 332
 333     def _top(self):
 334         """Get some tracks for top track queue mode
 335
 336         :return: list of Tracks
 337         """
 338         artists = self.get_local_similar_artists()
 339         chosen = self.find_top(artists)
 340         for track in chosen:
 341             self.log.info('%s candidates: %s', self.ws.name, track)
 342         return chosen
 343
 344     def callback_need_track(self):
 345         self._cleanup_cache()
 346         if not self.player.playlist:
 347             self.log.info('No last track, cannot queue')
 348             return None
 349         if not self.player.playlist[-1].artist:
 350             self.log.warning('No artist set for the last track in queue')
 351             self.log.debug(repr(self.player.current))
 352             return None
 353         candidates = self.queue_mode()
 354         msg = ' '.join(['{0}: {1:>3d}'.format(k, v) for
 355                         k, v in sorted(self.ws.stats.items())])
 356         self.log.debug('http stats: ' + msg)
 357         if not candidates:
 358             self.log.info('%s plugin found nothing to queue', self.ws.name)
 359         if self.plugin_conf.get('queue_mode') != 'album':
 360             random.shuffle(candidates)
 361         return candidates
 362
 363     def callback_player_database(self):
 364         self._flush_cache()
 365
 366 # VIM MODLINE
 367 # vim: ai ts=4 sw=4 sts=4 expandtab