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library.py
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library.py
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from __future__ import unicode_literals
import collections
import itertools
import logging
import operator
import re
from mopidy import backend, models
import uritools
from . import Extension, translator
QUERY_CHAR_RE = re.compile(r'([+!(){}\[\]^"~*?:\\]|\&\&|\|\|)')
QUERY_MAPPING = {
'any': None,
'album': 'title',
'albumartist': 'creator',
'date': 'date'
}
logger = logging.getLogger(__name__)
def _find(mapping, keys, default=None):
for key in keys:
if key in mapping:
return mapping[key]
return default
def _query(*args, **kwargs):
terms = []
for field, value in itertools.chain(args, kwargs.items()):
if not value:
continue
elif isinstance(value, basestring):
values = [_quote(value)]
else:
values = [_quote(v) for v in value]
if len(values) == 1:
term = values[0]
else:
term = '(%s)' % ' OR '.join(values)
terms.append(field + ':' + term if field else term)
return ' AND '.join(terms)
def _quote(term):
term = QUERY_CHAR_RE.sub(r'\\\1', term)
# only quote if term contains whitespace, since date:"2014-01-01"
# will raise an error
if any(c.isspace() for c in term):
term = '"' + term + '"'
return term
def _trackref(track):
return models.Ref.track(name=track.name, uri=track.uri)
class InternetArchiveLibraryProvider(backend.LibraryProvider):
root_directory = models.Ref.directory(
uri=uritools.uricompose(Extension.ext_name),
name='Internet Archive'
)
def __init__(self, config, backend):
super(InternetArchiveLibraryProvider, self).__init__(backend)
self.__config = ext_config = config[Extension.ext_name]
self.__search_filter = {
'format': ext_config['audio_formats'],
'-collection': ext_config['exclude_collections'],
'-mediatype': ext_config['exclude_mediatypes']
}
self.__tracks = {} # track cache for faster lookup
def browse(self, uri):
parts = uritools.urisplit(uri)
if parts.query:
return self.__browse_collection(parts.path, **parts.getquerydict())
elif parts.path:
return self.__browse_item(self.backend.client.getitem(parts.path))
else:
return self.__browse_root()
def lookup(self, uri):
try:
return [self.__tracks[uri]]
except KeyError:
logger.debug("track lookup cache miss for %r", uri)
try:
_, _, identifier, _, filename = uritools.urisplit(uri)
tracks = self.__gettracks(self.backend.client.getitem(identifier))
self.__tracks = trackmap = {t.uri: t for t in tracks}
return [trackmap[uri]] if filename else tracks
except Exception as e:
logger.error('Lookup failed for %s: %s', uri, e)
return []
def refresh(self, uri=None):
if self.backend.client.cache:
self.backend.client.cache.clear()
self.__tracks.clear()
def search(self, query=None, uris=None, exact=False):
if exact:
return None # exact queries not supported
terms = []
for field, values in (query.iteritems() if query else []):
if field not in QUERY_MAPPING:
return None # no result if unmapped field
else:
terms.extend((QUERY_MAPPING[field], v) for v in values)
if uris:
ids = filter(None, [uritools.urisplit(uri).path for uri in uris])
terms.append(('collection', tuple(ids)))
result = self.backend.client.search(
_query(*terms, **self.__search_filter),
fields=['identifier', 'title', 'creator', 'date'],
sort=self.__config['search_order'],
rows=self.__config['search_limit']
)
return models.SearchResult(
uri=uritools.uricompose(Extension.ext_name, query=result.query),
albums=map(translator.album, result)
)
def __browse_collection(self, identifier, q=[], sort=['downloads desc']):
if identifier:
query = _query(collection=identifier, **self.__search_filter),
else:
query = ' AND '.join(q) + ' AND ' + _query(**self.__search_filter)
return map(translator.ref, self.backend.client.search(
query,
fields=['identifier', 'title', 'mediatype', 'creator'],
rows=self.__config['browse_limit'],
sort=sort
))
def __browse_item(self, item):
metadata = item['metadata']
if metadata.get('mediatype') != 'collection':
return list(map(_trackref, self.__gettracks(item)))
elif 'members' in item:
return list(map(translator.ref, item['members']))
else:
return self.__browse_views(metadata['identifier'])
# tracks = self.__lookup(identifier)
# self.__tracks = {t.uri: t for t in tracks} # cache tracks
# return [models.Ref.track(uri=t.uri, name=t.name) for t in tracks]
def __browse_views(self, identifier, scheme=Extension.ext_name):
refs = []
for order, name in self.__config['browse_views'].items():
uri = uritools.uricompose(scheme, path=identifier, query={
'sort': order
})
refs.append(models.Ref.directory(name=name, uri=uri))
return refs
def __browse_root(self):
collections = self.__config['collections']
objs = {obj['identifier']: obj for obj in self.backend.client.search(
_query(identifier=collections, mediatype='collection'),
fields=['identifier', 'title', 'mediatype', 'creator'],
rows=len(collections)
)}
# keep order from config
refs = []
for identifier in collections:
try:
obj = objs[identifier]
except KeyError:
logger.warn('Internet Archive collection "%s" not found',
identifier)
else:
refs.append(translator.ref(obj))
return refs
def __gettracks(self, item, namegetter=operator.itemgetter('name')):
client = self.backend.client
metadata = item['metadata']
files = collections.defaultdict(dict)
# HACK: not all files have "mtime", but reverse-sorting on
# filename tends to preserve "l(e)ast derived" versions,
# e.g. "filename.mp3" over "filename_vbr.mp3"
for file in sorted(item['files'], key=namegetter, reverse=True):
original = str(file.get('original', file['name']))
files[file['format']][original] = file
images = []
for file in _find(files, self.__config['image_formats'], {}).values():
images.append(client.geturl(metadata['identifier'], file['name']))
album = translator.album(metadata, images)
tracks = []
for file in _find(files, self.__config['audio_formats'], {}).values():
tracks.append(translator.track(metadata, file, album))
tracks.sort(key=lambda t: (t.track_no or 0, t.uri))
return tracks