def get_cache_key(self):
"""Construct a cache key from genre + user + time"""
request_items = to_dict(request.args)
request_items.pop('limit', None)
request_items.pop('offset', None)
key = extract_key(request.path, request_items.items())
return key
def get_full_trending_playlists(request, args, strategy):
offset, limit = format_offset(args), format_limit(args, TRENDING_LIMIT)
current_user_id, time = args.get("user_id"), args.get("time", "week")
time = "week" if time not in ["week", "month", "year"] else time
# If we have a user_id, we call into `get_trending_playlist`
# which fetches the cached unpopulated tracks and then
# populates metadata. Otherwise, just
# retrieve the last cached value.
#
# If current_user_id,
# apply limit + offset inside the cached calculation.
# Otherwise, apply it here.
if current_user_id:
args = {
'time': time,
'with_tracks': True,
'limit': limit,
'offset': offset
}
decoded = decode_string_id(current_user_id)
args["current_user_id"] = decoded
playlists = get_trending_playlists(args, strategy)
else:
args = {
'time': time,
'with_tracks': True,
}
key = get_trending_cache_key(to_dict(request.args), request.path)
playlists = use_redis_cache(
key, TRENDING_TTL_SEC,
lambda: get_trending_playlists(args, strategy))
playlists = playlists[offset:limit + offset]
return playlists
def get_full_recommended_tracks(request, args, strategy):
# Attempt to use the cached tracks list
if args["user_id"] is not None:
full_recommended = get_recommended_tracks(args, strategy)
else:
key = get_trending_cache_key(to_dict(request.args), request.path)
full_recommended = use_redis_cache(
key, TRENDING_TTL_SEC,
lambda: get_recommended_tracks(args, strategy))
return full_recommended
def get_full_trending(request, args, strategy):
offset = format_offset(args)
limit = format_limit(args, TRENDING_LIMIT)
key = get_trending_cache_key(to_dict(request.args), request.path)
# Attempt to use the cached tracks list
if args['user_id'] is not None:
full_trending = get_trending(args, strategy)
else:
full_trending = use_redis_cache(key, TRENDING_TTL_SEC,
lambda: get_trending(args, strategy))
trending_tracks = full_trending[offset:limit + offset]
return trending_tracks
def get_underground_trending(request, args, strategy):
offset, limit = format_offset(args), format_limit(args, TRENDING_LIMIT)
current_user_id = args.get("user_id")
args = {'limit': limit, 'offset': offset}
# If user ID, let _get_underground_trending
# handle caching + limit + offset
if current_user_id:
decoded = decode_string_id(current_user_id)
args["current_user_id"] = decoded
trending = _get_underground_trending(args, strategy)
else:
# If no user ID, fetch all cached tracks
# and perform pagination here, passing
# no args so we get the full list of tracks.
key = get_trending_cache_key(to_dict(request.args), request.path)
trending = use_redis_cache(
key, TRENDING_TTL_SEC,
lambda: _get_underground_trending({}, strategy))
trending = trending[offset:limit + offset]
return trending
