def get_basic_release(mbid):
"""
Make sure release and its dependencies are present and contain required data.
@param mbid: a string containing a MusicBrainz ID of an artist
@return: a CachedReleaseGroup object containing required minimal data set
"""
release_group = CachedReleaseGroup.view('artists/releases',include_docs=True, key=mbid).one()
if not release_group:
# TODO: optimize? its just one additional request on rare ocassions tho..
try:
t = mmda_logger('mb','request','artist mbid of release',mbid)
mb_release = mb_query.getReleaseById(mbid, MB_RELEASE_ARTIST)
artist_mbid = extractUuid(mb_release.artist.id)
mmda_logger('mb','result','artist mbid',artist_mbid,t)
except WebServiceError, e:
# TODO: add error handling here
mmda_logger('mb-release','ERROR',e)
raise e
else:
get_basic_artist(artist_mbid)
release_group = CachedReleaseGroup.view('artists/releases',include_docs=True, key=mbid).one()
def _create_shallow_releases_mb(mb_artist):
"""
Create CachedReleaseGroup documents using basic MusicBrainz data fetched with artist.
@param mb_artist: a musicbrainz2.model.Artist object
"""
mb_releases = mb_artist.getReleases()
artist_mbid = extractUuid(mb_artist.id)
# magical place where all data is cached/processed before database commit
there_will_be_dragons = {}
for mb_release in mb_releases:
group_mbid = extractUuid(mb_release.releaseGroup.id)
release_mbid = extractUuid(mb_release.id)
# its ugly, but we fill this only once (place for future improvements)
if group_mbid not in there_will_be_dragons:
release_group = {}
release_group['_id'] = group_mbid
release_group['artist_mbid'] = artist_mbid
release_group['artist_name'] = mb_artist.name
release_group['title'] = mb_release.releaseGroup.title
# small fix: in some rare cases, ReleaseGroup at Musicbrainz has no 'type' property
release_group['release_type'] = decruft_mb(mb_release.releaseGroup.type) if mb_release.releaseGroup.type else 'Other'
release_group['releases'] = {}
there_will_be_dragons[group_mbid] = release_group
else:
release_group = there_will_be_dragons[group_mbid]
# store only basic information about release event
mb_release_events = []
for mb_event in mb_release.getReleaseEvents():
event = {}
if mb_event.date:
event['date'] = mb_event.date
if mb_event.format:
event['format'] = decruft_mb(mb_event.format)
if mb_event.country:
event['country'] = mb_event.country
if event:
mb_release_events.append(event)
release_group['releases'][release_mbid] = {
'title':mb_release.title,
'tracks_count':mb_release.tracksCount,
'release_events':mb_release_events,
'cache_state':{'mb':[1,datetime.utcnow()]}
}
# primary release is the one with earliest release date (place for future improvements)
mb_earliest_release_date = mb_release.getEarliestReleaseEvent().getDate() if mb_release.getEarliestReleaseEvent() else None
if 'primary' not in release_group or release_group['primary'][1] == None or mb_earliest_release_date < release_group['primary'][1]:
release_group['primary'] = [release_mbid, mb_earliest_release_date]
# just to make sure no old data is left..
old_cached_release_groups = get_db('artists').view('artists/release_groups', key=artist_mbid)
for group in old_cached_release_groups:
del get_db('artists')[group['id']]
for release_group in there_will_be_dragons.itervalues():
cached_release_group = CachedReleaseGroup.wrap(release_group) # TODO: think if wrap is the best way of dealing with this
cached_release_group.cache_state['mb'] = [1,datetime.utcnow()]
cached_release_group.save() # TODO: add try in case of ResourceConflict?
mmda_logger('db','store', cached_release_group)
