feat(chat): support mp/playlist chat

app/service/subscribers/chat.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from .base import RedisSubscriber
+
+if TYPE_CHECKING:
+    from app.router.chat.server import ChatServer
+
+
+JOIN_CHANNEL = "chat:room:joined"
+EXIT_CHANNEL = "chat:room:left"
+
+
+class ChatSubscriber(RedisSubscriber):
+    def __init__(self):
+        super().__init__()
+        self.room_subscriber: dict[int, list[int]] = {}
+        self.chat_server: "ChatServer | None" = None
+
+    async def start_subscribe(self):
+        await self.subscribe(JOIN_CHANNEL)
+        self.add_handler(JOIN_CHANNEL, self.on_join_room)
+        await self.subscribe(EXIT_CHANNEL)
+        self.add_handler(EXIT_CHANNEL, self.on_leave_room)
+        self.start()
+
+    async def on_join_room(self, c: str, s: str):
+        channel_id, user_id = s.split(":")
+        if self.chat_server is None:
+            return
+        await self.chat_server.join_room_channel(int(channel_id), int(user_id))
+
+    async def on_leave_room(self, c: str, s: str):
+        channel_id, user_id = s.split(":")
+        if self.chat_server is None:
+            return
+        await self.chat_server.leave_room_channel(int(channel_id), int(user_id))