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.to_add = list()
  67         self._cache = None
  68         self._flush_cache()
  69         wrapper = {'track': self._track,
  70                    'top': self._top,
  71                    'album': self._album}
  72         self.queue_mode = wrapper.get(self.plugin_conf.get('queue_mode'))
  73         self.ws = None
  74         self.ws_retry = 0
  75
  76     def _flush_cache(self):
  77         """
  78         Both flushes and instanciates _cache
  79         """
  80         name = self.__class__.__name__
  81         if isinstance(self._cache, dict):
  82             self.log.info('%s: Flushing cache!', name)
  83         else:
  84             self.log.info('%s: Initialising cache!', name)
  85         self._cache = {'asearch': dict(),
  86                        'tsearch': dict()}
  87
  88     def _cleanup_cache(self):
  89         """Avoid bloated cache
  90         """
  91         for _, val in self._cache.items():
  92             if isinstance(val, dict):
  93                 while len(val) > 150:
  94                     val.popitem()
  95
  96     @cache
  97     def get_artists_from_player(self, similarities):
  98         """
  99         Look in player library for availability of similar artists in
 100         similarities
 101         """
 102         dynamic = self.plugin_conf.getint('max_art')
 103         if dynamic <= 0:
 104             dynamic = 100
 105         results = list()
 106         similarities.reverse()
 107         while (len(results) < dynamic and similarities):
 108             art_pop = similarities.pop()
 109             res = self.player.search_artist(art_pop)
 110             if res:
 111                 results.append(res)
 112         return results
 113
 114     def ws_similar_artists(self, artist):
 115         """
 116         Retrieve similar artists from WebServive.
 117         """
 118         # initialize artists deque list to construct from DB
 119         as_art = deque()
 120         as_artists = self.ws.get_similar(artist=artist)
 121         self.log.debug('Requesting %s for %r', self.ws.name, artist)
 122         try:
 123             [as_art.append(art) for art in as_artists]
 124         except WSNotFound as err:
 125             self.log.warning('%s: %s', self.ws.name, err)
 126             if artist.mbid:
 127                 self.log.debug('Trying without MusicBrainzID')
 128                 try:
 129                     return self.ws_similar_artists(Artist(name=artist.name))
 130                 except WSNotFound as err:
 131                     self.log.debug('%s: %s', self.ws.name, err)
 132         except WSTimeout as err:
 133             self.log.warning('%s: %s', self.ws.name, err)
 134             if self.ws_retry < 3:
 135                 self.ws_retry += 1
 136                 self.log.warning('%s: retrying', self.ws.name)
 137                 as_art = self.ws_similar_artists(artist)
 138             else:
 139                 self.log.warning('%s: stop retrying', self.ws.name)
 140             self.ws_retry = 0
 141         except WSError as err:
 142             self.log.warning('%s: %s', self.ws.name, err)
 143         if as_art:
 144             self.log.debug('Fetched %d artist(s)', len(as_art))
 145         return as_art
 146
 147     def get_recursive_similar_artist(self):
 148         """Check against local player for similar artists (recursive w/ history)
 149         """
 150         if not self.player.playlist:
 151             return []
 152         history = list(self.history)
 153         # In random play mode use complete playlist to filter
 154         if self.player.playmode.get('random'):
 155             history = self.player.playlist + history
 156         else:
 157             history = self.player.queue + history
 158         history = deque(history)
 159         last_trk = history.popleft()  # remove
 160         extra_arts = list()
 161         ret_extra = list()
 162         depth = 0
 163         while depth < self.plugin_conf.getint('depth'):
 164             if not history:
 165                 break
 166             trk = history.popleft()
 167             if (trk.Artist in extra_arts
 168                     or trk.Artist == last_trk.Artist):
 169                 continue
 170             extra_arts.append(trk.Artist)
 171             depth += 1
 172         self.log.debug('EXTRA ARTS: %s', '/'.join(map(str, extra_arts)))
 173         for artist in extra_arts:
 174             self.log.debug('Looking for artist similar '
 175                            'to "%s" as well', artist)
 176             similar = self.ws_similar_artists(artist=artist)
 177             if not similar:
 178                 continue
 179             ret_extra.extend(self.get_artists_from_player(similar))
 180
 181         if last_trk.Artist in ret_extra:
 182             ret_extra.remove(last_trk.Artist)
 183         if ret_extra:
 184             self.log.debug('similar artist(s) found: %s',
 185                            ' / '.join(map(str, MetaContainer(ret_extra))))
 186         return ret_extra
 187
 188     def get_local_similar_artists(self):
 189         """Check against local player for similar artists
 190         """
 191         if not self.player.playlist:
 192             return []
 193         tolookfor = self.player.playlist[-1].Artist
 194         self.log.info('Looking for artist similar to "%s"', tolookfor)
 195         self.log.debug('%r', tolookfor)
 196         similar = self.ws_similar_artists(tolookfor)
 197         if not similar:
 198             self.log.info('Got nothing from %s!', self.ws.name)
 199             return []
 200         self.log.info('First five similar artist(s): %s...',
 201                       ' / '.join(map(str, list(similar)[:5])))
 202         self.log.info('Looking availability in music library')
 203         ret = MetaContainer(self.get_artists_from_player(similar))
 204         if ret:
 205             self.log.debug('regular found in library: %s',
 206                            ' / '.join(map(str, ret)))
 207         else:
 208             self.log.debug('Got nothing similar from library!')
 209         ret_extra = None
 210         if len(self.history) >= 2:
 211             if self.plugin_conf.getint('depth') > 1:
 212                 ret_extra = self.get_recursive_similar_artist()
 213         if ret_extra:
 214             # get them reorg to pick up best element
 215             ret_extra = self.get_reorg_artists_list(ret_extra)
 216             # tries to pickup less artist from extra art
 217             if len(ret) > 4:
 218                 ret_extra = MetaContainer(ret_extra[:max(4, len(ret))//2])
 219             if ret_extra:
 220                 self.log.debug('extra found in library: %s',
 221                                ' / '.join(map(str, ret_extra)))
 222             ret = ret | ret_extra
 223         if not ret:
 224             self.log.warning('Got nothing from music library.')
 225             return []
 226         # In random play mode use complete playlist to filter
 227         if self.player.playmode.get('random'):
 228             queued_artists = MetaContainer([trk.Artist for trk
 229                                             in self.player.playlist])
 230         else:
 231             queued_artists = MetaContainer([trk.Artist for trk
 232                                             in self.player.queue])
 233         self.log.trace('Already queued: %s', queued_artists)
 234         self.log.trace('Candidate: %s', ret)
 235         if ret & queued_artists:
 236             self.log.debug('Removing already queued artists: '
 237                            '%s', '/'.join(map(str, ret & queued_artists)))
 238             ret = ret - queued_artists
 239         current = self.player.current
 240         if current and current.Artist in ret:
 241             self.log.debug('Removing current artist: %s', current.Artist)
 242             ret = ret - MetaContainer([current.Artist])
 243         # Move around similars items to get in unplayed|not recently played
 244         # artist first.
 245         self.log.info('Got %d artists in library', len(ret))
 246         candidates = self.get_reorg_artists_list(ret)
 247         if candidates:
 248             self.log.info(' / '.join(map(str, candidates)))
 249         return candidates
 250
 251     def _get_album_history(self, artist):
 252         """Retrieve album history"""
 253         albums_list = set()
 254         for trk in self.get_history(artist=artist.name):
 255             if not trk.album:
 256                 continue
 257             albums_list.add(trk.album)
 258         return albums_list
 259
 260     def find_album(self, artists):
 261         """Find albums to queue.
 262         """
 263         self.to_add = list()
 264         nb_album_add = 0
 265         target_album_to_add = self.plugin_conf.getint('album_to_add')
 266         for artist in artists:
 267             album = self.album_candidate(artist, unplayed=True)
 268             if not album:
 269                 continue
 270             nb_album_add += 1
 271             candidates = self.player.find_tracks(album)
 272             if self.plugin_conf.getboolean('shuffle_album'):
 273                 random.shuffle(candidates)
 274             # this allows to select a maximum number of track from the album
 275             # a value of 0 (default) means keep all
 276             nbtracks = self.plugin_conf.getint('track_to_add_from_album')
 277             if nbtracks > 0:
 278                 candidates = candidates[0:nbtracks]
 279             self.to_add.extend(candidates)
 280             if nb_album_add == target_album_to_add:
 281                 return
 282
 283     def find_top(self, artists):
 284         """
 285         find top tracks for artists in artists list.
 286         """
 287         self.to_add = list()
 288         nbtracks_target = self.plugin_conf.getint('track_to_add')
 289         for artist in artists:
 290             if len(self.to_add) == nbtracks_target:
 291                 return
 292             self.log.info('Looking for a top track for %s', artist)
 293             titles = deque()
 294             try:
 295                 titles = [t for t in self.ws.get_toptrack(artist)]
 296             except WSError as err:
 297                 self.log.warning('%s: %s', self.ws.name, err)
 298                 continue
 299             for trk in titles:
 300                 found = self.player.search_track(artist, trk.title)
 301                 if found:
 302                     random.shuffle(found)
 303                     top_trk = self.filter_track(found)
 304                     if top_trk:
 305                         self.to_add.append(top_trk)
 306                         break
 307
 308     def _track(self):
 309         """Get some tracks for track queue mode
 310         """
 311         artists = self.get_local_similar_artists()
 312         nbtracks_target = self.plugin_conf.getint('track_to_add')
 313         for artist in artists:
 314             self.log.debug('Trying to find titles to add for "%r"', artist)
 315             found = self.player.find_tracks(artist)
 316             if not found:
 317                 self.log.debug('Found nothing to queue for %s', artist)
 318                 continue
 319             random.shuffle(found)
 320             # find tracks not in history for artist
 321             track_candidate = self.filter_track(found)
 322             if track_candidate:
 323                 self.to_add.append(track_candidate)
 324             if len(self.to_add) == nbtracks_target:
 325                 break
 326         if not self.to_add:
 327             self.log.debug('Found no tracks to queue!')
 328             return
 329         for track in self.to_add:
 330             self.log.info('%s candidates: %s', track, self.ws.name)
 331
 332     def _album(self):
 333         """Get albums for album queue mode
 334         """
 335         artists = self.get_local_similar_artists()
 336         self.find_album(artists)
 337
 338     def _top(self):
 339         """Get some tracks for top track queue mode
 340         """
 341         artists = self.get_local_similar_artists()
 342         self.find_top(artists)
 343         for track in self.to_add:
 344             self.log.info('%s candidates: %s', self.ws.name, track)
 345
 346     def callback_need_track(self):
 347         self._cleanup_cache()
 348         if not self.player.playlist:
 349             self.log.info('No last track, cannot queue')
 350             return None
 351         if not self.player.playlist[-1].artist:
 352             self.log.warning('No artist set for the last track in queue')
 353             self.log.debug(repr(self.player.current))
 354             return None
 355         self.queue_mode()
 356         msg = ' '.join(['{0}: {1:>3d}'.format(k, v) for
 357                         k, v in sorted(self.ws.stats.items())])
 358         self.log.debug('http stats: ' + msg)
 359         candidates = self.to_add
 360         self.to_add = list()
 361         if self.plugin_conf.get('queue_mode') != 'album':
 362             random.shuffle(candidates)
 363         return candidates
 364
 365     def callback_player_database(self):
 366         self._flush_cache()
 367
 368 # VIM MODLINE
 369 # vim: ai ts=4 sw=4 sts=4 expandtab