尝试大改，可读性有点差的版本，基本做到能实时处理弹幕

store/mongo.py

@@ -1,26 +0,0 @@
-import pymongo
-
-from config.helper import config
-
-class MongoStore:
-    def __init__(self):
-        self.client = pymongo.MongoClient(config()['mongo']['uri'])
-        self.db = self.client[config()['mongo']['dbname']]
-    
-    def close(self):
-        self.client.close()
-    
-    def set_collection(self, collection):
-        self.collection = self.db[collection]
-    
-    def replace_one(self, condition, data, upsert=True):
-        return self.collection.replace_one(condition, data, upsert=upsert)
-    
-    def insert_one(self, data):
-        return self.collection.insert_one(data)
-
-    def insert_many(self, data):
-        return self.collection.insert_many(data)
-
-    def exists(self, condition):
-        return self.collection.count_documents(condition, limit = 1) != 0