big update

db.py

@@ -0,0 +1,33 @@
+from ZODB import DB
+from ZODB.Connection import Connection
+from ZODB.FileStorage import FileStorage
+from persistent import Persistent
+from persistent.mapping import PersistentMapping
+from transaction import commit
+from telegram import Message, Chat
+
+
+def get_conn(read_only=False) -> Connection:
+    storage = FileStorage('users.fs', read_only=read_only)
+    db = DB(storage)
+    conn = db.open()
+    if not hasattr(conn.root, 'subscribers'):
+        conn.root.subscribers = PersistentMapping()
+    return conn
+
+
+class Subscriber(Persistent):
+    def __init__(self, user_id, name):
+        self.uid = user_id
+        self.name = name
+
+    def update_from_message(self, m: Message):
+        self.name = Subscriber.get_name(m.chat)
+
+    @classmethod
+    def get_name(cls, chat: Chat):
+        return f'{chat.first_name or ""} {chat.last_name or ""} {chat.title or ""}'.strip()
+
+    @classmethod
+    def from_chat(cls, chat: Chat):
+        return cls(chat.id, cls.get_name(chat))