REFACTOR: MUSIC LIBRARYgit status #91

media/library.py

@@ -0,0 +1,70 @@
+import logging
+
+from database import MusicDatabase
+from media.item import item_builders, item_loaders, item_id_generators
+from media.file import FileItem
+from media.url import URLItem
+from media.url_from_playlist import PlaylistURLItem
+from media.radio import RadioItem
+from database import MusicDatabase
+import variables as var
+
+
+class MusicLibrary(dict):
+    def __init__(self, db: MusicDatabase):
+        super().__init__()
+        self.db = db
+        self.log = logging.getLogger("bot")
+
+    def get_item_by_id(self, bot, id):
+        if id in self:
+            return self[id]
+
+        # if not cached, query the database
+        item = self.fetch(bot, id)
+        if item is not None:
+            self[id] = item
+            self.log.debug("library: music found in database: %s" % item.format_debug_string())
+            return item
+
+    def get_item(self, bot, **kwargs):
+        # kwargs should provide type and id, and parameters to build the item if not existed in the library.
+        # if cached
+        id = item_id_generators[kwargs['type']](**kwargs)
+        if id in self:
+            return self[id]
+
+        # if not cached, query the database
+        item = self.fetch(bot, id)
+        if item is not None:
+            self[id] = item
+            self.log.debug("library: music found in database: %s" % item.format_debug_string())
+            return item
+
+        # if not in the database, build one
+        self[id] = item_builders[kwargs['type']](bot, **kwargs) # newly built item will not be saved immediately
+        return self[id]
+
+    def fetch(self, bot, id):
+        music_dicts = self.db.query_music(id=id)
+        if music_dicts:
+            music_dict = music_dicts[0]
+            type = music_dict['type']
+            self[id] = item_loaders[type](bot, music_dict)
+            return self[id]
+        else:
+            return None
+
+    def save(self, id):
+        self.log.debug("library: music save into database: %s" % self[id].format_debug_string())
+        self.db.insert_music(self[id].to_dict())
+
+    def delete(self, id):
+        self.db.delete_music(id=id)
+
+    def free(self, id):
+        if id in self:
+            del self[id]
+
+    def free_all(self):
+        self.clear()