# -*- coding: utf-8 -*-
+"""
+Fetching similar artists from last.fm web services
+"""
# standart library import
-#from select import select
+import random
+
+from collections import deque
+from itertools import dropwhile
+from hashlib import md5
# third parties componants
# local import
from ..lib.plugin import Plugin
+from ..lib.simafm import SimaFM, XmlFMHTTPError, XmlFMNotFound, XmlFMError
+from ..lib.track import Track
+
+
+def cache(func):
+ """Caching decorator"""
+ def wrapper(*args, **kwargs):
+ #pylint: disable=W0212,C0111
+ cls = args[0]
+ similarities = [art + str(match) for art, match in args[1]]
+ hashedlst = md5(''.join(similarities).encode('utf-8')).hexdigest()
+ if hashedlst in cls._cache.get('asearch'):
+ cls.log.debug('cached request')
+ results = cls._cache.get('asearch').get(hashedlst)
+ else:
+ results = func(*args, **kwargs)
+ cls._cache.get('asearch').update({hashedlst:list(results)})
+ random.shuffle(results)
+ return results
+ return wrapper
+
+def blacklist(artist=False, album=False, track=False):
+ field = (bl for bl in (artist, album, track))
+ def decorated(func):
+ def wrapper(*args, **kwargs):
+ cls = args[0]
+ bl_fun = (cls._Plugin__daemon.sdb.get_bl_artist,
+ cls._Plugin__daemon.sdb.get_bl_album,
+ cls._Plugin__daemon.sdb.get_bl_track,)
+ #bl_getter = next(fn for fn, bl in zip(bl_fun, field) if bl is True)
+ bl_getter = next(dropwhile(lambda _: not next(field), bl_fun))
+ results = func(*args, **kwargs)
+ cls.log.debug('using {0} as bl filter'.format(bl_getter.__name__))
+ for elem in results:
+ if bl_getter(elem, add_not=True):
+ cls.log.info('Blacklisted: {0}'.format(elem))
+ results.remove(elem)
+ return results
+ return wrapper
+ return decorated
+
-class Last(Plugin):
+class Lastfm(Plugin):
"""last.fm similar artists
"""
- pass
+ def __init__(self, daemon):
+ Plugin.__init__(self, daemon)
+ self.daemon_conf = daemon.config
+ self.sdb = daemon.sdb
+ self.history = daemon.short_history
+ ##
+ self.to_add = list()
+ self._cache = None
+ self._flush_cache()
+ wrapper = {
+ 'track': self._track,
+ 'top': self._top,
+ 'album': self._album,
+ }
+ self.queue_mode = wrapper.get(self.plugin_conf.get('queue_mode'))
+
+ def _flush_cache(self):
+ """
+ Both flushes and instanciates _cache
+ """
+ if isinstance(self._cache, dict):
+ self.log.info('Lastfm: Flushing cache!')
+ else:
+ self.log.info('Lastfm: Initialising cache!')
+ self._cache = {
+ 'artists': None,
+ 'asearch': dict(),
+ 'tsearch': dict(),
+ }
+ self._cache['artists'] = frozenset(self.player.list('artist'))
+
+ def _cleanup_cache(self):
+ """Avoid bloated cache
+ """
+ for _ , val in self._cache.items():
+ if isinstance(val, dict):
+ while len(val) > 150:
+ val.popitem()
+
+ def get_history(self, artist):
+ """Constructs list of Track for already played titles for an artist.
+ """
+ duration = self.daemon_conf.getint('sima', 'history_duration')
+ tracks_from_db = self.sdb.get_history(duration=duration, artist=artist)
+ # Construct Track() objects list from database history
+ played_tracks = [Track(artist=tr[-1], album=tr[1], title=tr[2],
+ file=tr[3]) for tr in tracks_from_db]
+ return played_tracks
+
+ def filter_track(self, tracks):
+ """
+ Extract one unplayed track from a Track object list.
+ * not in history
+ * not already in the queue
+ """
+ artist = tracks[0].artist
+ black_list = self.player.queue + self.to_add
+ not_in_hist = list(set(tracks) - set(self.get_history(artist=artist)))
+ if not not_in_hist:
+ self.log.debug('All tracks already played for "{}"'.format(artist))
+ random.shuffle(not_in_hist)
+ candidate = [ trk for trk in not_in_hist if trk not in black_list ]
+ if not candidate:
+ self.log.debug('Unable to find title to add' +
+ ' for "%s".' % artist)
+ return None
+ self.to_add.append(random.choice(candidate))
+
+ def _get_artists_list_reorg(self, alist):
+ """
+ Move around items in artists_list in order to play first not recently
+ played artists
+ """
+ # TODO: move to utils as a decorator
+ duration = self.daemon_conf.getint('sima', 'history_duration')
+ art_in_hist = list()
+ for trk in self.sdb.get_history(duration=duration,
+ artists=alist):
+ if trk[0] not in art_in_hist:
+ art_in_hist.append(trk[0])
+ art_in_hist.reverse()
+ art_not_in_hist = [ ar for ar in alist if ar not in art_in_hist ]
+ random.shuffle(art_not_in_hist)
+ art_not_in_hist.extend(art_in_hist)
+ self.log.debug('history ordered: {}'.format(
+ ' / '.join(art_not_in_hist)))
+ return art_not_in_hist
+
+ @blacklist(artist=True)
+ @cache
+ def get_artists_from_player(self, similarities):
+ """
+ Look in player library for availability of similar artists in
+ similarities
+ """
+ dynamic = int(self.plugin_conf.get('dynamic'))
+ if dynamic <= 0:
+ dynamic = 100
+ similarity = int(self.plugin_conf.get('similarity'))
+ results = list()
+ similarities.reverse()
+ while (len(results) < dynamic
+ and len(similarities) > 0):
+ art_pop, match = similarities.pop()
+ if match < similarity:
+ break
+ results.extend(self.player.fuzzy_find(art_pop))
+ results and self.log.debug('Similarity: %d%%' % match) # pylint: disable=w0106
+ return results
+
+ def lfm_similar_artists(self, artist=None):
+ """
+ Retrieve similar artists on last.fm server.
+ """
+ if artist is None:
+ current = self.player.current
+ else:
+ current = artist
+ simafm = SimaFM()
+ # initialize artists deque list to construct from DB
+ as_art = deque()
+ as_artists = simafm.get_similar(artist=current.artist)
+ self.log.debug('Requesting last.fm for "{0.artist}"'.format(current))
+ try:
+ [as_art.append((a, m)) for a, m in as_artists]
+ except XmlFMHTTPError as err:
+ self.log.warning('last.fm http error: %s' % err)
+ except XmlFMNotFound as err:
+ self.log.warning("last.fm: %s" % err)
+ except XmlFMError as err:
+ self.log.warning('last.fm module error: %s' % err)
+ if as_art:
+ self.log.debug('Fetched %d artist(s) from last.fm' % len(as_art))
+ return as_art
+
+ def get_recursive_similar_artist(self):
+ history = deque(self.history)
+ history.popleft()
+ ret_extra = list()
+ depth = 0
+ current = self.player.current
+ extra_arts = list()
+ while depth < int(self.plugin_conf.get('depth')):
+ trk = history.popleft()
+ if trk.artist in [trk.artist for trk in extra_arts]:
+ continue
+ extra_arts.append(trk)
+ depth += 1
+ if len(history) == 0:
+ break
+ self.log.info('EXTRA ARTS: {}'.format(
+ '/'.join([trk.artist for trk in extra_arts])))
+ for artist in extra_arts:
+ self.log.debug('Looking for artist similar to "{0.artist}" as well'.format(artist))
+ similar = self.lfm_similar_artists(artist=artist)
+ similar = sorted(similar, key=lambda sim: sim[1], reverse=True)
+ ret_extra.extend(self.get_artists_from_player(similar))
+ if current.artist in ret_extra:
+ ret_extra.remove(current.artist)
+ return ret_extra
+
+ def get_local_similar_artists(self):
+ """Check against local player for similar artists fetched from last.fm
+ """
+ current = self.player.current
+ self.log.info('Looking for artist similar to "{0.artist}"'.format(current))
+ similar = self.lfm_similar_artists()
+ if not similar:
+ self.log.info('Got nothing from last.fm!')
+ return []
+ similar = sorted(similar, key=lambda sim: sim[1], reverse=True)
+ self.log.info('First five similar artist(s): {}...'.format(
+ ' / '.join([a for a, m in similar[0:5]])))
+ self.log.info('Looking availability in music library')
+ ret = self.get_artists_from_player(similar)
+ ret_extra = None
+ if len(self.history) >= 2:
+ ret_extra = self.get_recursive_similar_artist()
+ if not ret:
+ self.log.warning('Got nothing from music library.')
+ self.log.warning('Try running in debug mode to guess why...')
+ return []
+ if ret_extra:
+ ret = list(set(ret) | set(ret_extra))
+ self.log.info('Got {} artists in library'.format(len(ret)))
+ self.log.info(' / '.join(ret))
+ # Move around similars items to get in unplayed|not recently played
+ # artist first.
+ return self._get_artists_list_reorg(ret)
+
+ def _track(self):
+ """Get some tracks for track queue mode
+ """
+ artists = self.get_local_similar_artists()
+ nbtracks_target = int(self.plugin_conf.get('track_to_add'))
+ for artist in artists:
+ self.log.debug('Trying to find titles to add for "{}"'.format(
+ artist))
+ found = self.player.find_track(artist)
+ # find tracks not in history for artist
+ self.filter_track(found)
+ if len(self.to_add) == nbtracks_target:
+ break
+ if not self.to_add:
+ self.log.debug('Found no unplayed tracks, is your ' +
+ 'history getting too large?')
+ return None
+ for track in self.to_add:
+ self.log.info('last.fm candidate: {0!s}'.format(track))
+
+ def _album(self):
+ """Get albums for album queue mode
+ """
+ #artists = self.get_local_similar_artists()
+ pass
+
+ def _top(self):
+ """Get some tracks for top track queue mode
+ """
+ #artists = self.get_local_similar_artists()
+ pass
+
+ def callback_need_track(self):
+ self._cleanup_cache()
+ if not self.player.current:
+ self.log.info('Not currently playing track, cannot queue')
+ return None
+ self.queue_mode()
+ candidates = self.to_add
+ self.to_add = list()
+ return candidates
+
+ def callback_player_database(self):
+ self._flush_cache()
# VIM MODLINE
# vim: ai ts=4 sw=4 sts=4 expandtab
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