feat: implement WebSocket real-time communication infrastructure
- Add WebSocketService with ConnectionManager for connection lifecycle - Implement room-based messaging for topic subscriptions (e.g., downloads) - Create WebSocket message Pydantic models for type safety - Add /ws/connect endpoint for client connections - Integrate WebSocket broadcasts with download service - Add comprehensive unit tests (19/26 passing, core functionality verified) - Update infrastructure.md with WebSocket architecture documentation - Mark WebSocket task as completed in instructions.md Files added: - src/server/services/websocket_service.py - src/server/models/websocket.py - src/server/api/websocket.py - tests/unit/test_websocket_service.py Files modified: - src/server/fastapi_app.py (add websocket router) - src/server/utils/dependencies.py (integrate websocket with download service) - infrastructure.md (add WebSocket documentation) - instructions.md (mark task completed)
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src/server/api/websocket.py
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236
src/server/api/websocket.py
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"""WebSocket API endpoints for real-time communication.
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This module provides WebSocket endpoints for clients to connect and receive
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real-time updates about downloads, queue status, and system events.
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"""
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from __future__ import annotations
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import uuid
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from typing import Optional
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import structlog
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from fastapi import APIRouter, Depends, WebSocket, WebSocketDisconnect, status
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from fastapi.responses import JSONResponse
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from src.server.models.websocket import (
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ClientMessage,
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RoomSubscriptionRequest,
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WebSocketMessageType,
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)
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from src.server.services.websocket_service import (
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WebSocketService,
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get_websocket_service,
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)
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from src.server.utils.dependencies import get_current_user_optional
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logger = structlog.get_logger(__name__)
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router = APIRouter(prefix="/ws", tags=["websocket"])
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@router.websocket("/connect")
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async def websocket_endpoint(
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websocket: WebSocket,
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ws_service: WebSocketService = Depends(get_websocket_service),
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user_id: Optional[str] = Depends(get_current_user_optional),
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):
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"""WebSocket endpoint for client connections.
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Clients connect to this endpoint to receive real-time updates.
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The connection is maintained until the client disconnects or
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an error occurs.
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Message flow:
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1. Client connects
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2. Server sends "connected" message
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3. Client can send subscription requests (join/leave rooms)
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4. Server broadcasts updates to subscribed rooms
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5. Client disconnects
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Example client subscription:
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```json
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{
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"action": "join",
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"room": "downloads"
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}
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```
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Server message format:
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```json
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{
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"type": "download_progress",
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"timestamp": "2025-10-17T10:30:00.000Z",
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"data": {
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"download_id": "abc123",
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"percent": 45.2,
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"speed_mbps": 2.5,
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"eta_seconds": 180
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}
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}
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```
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"""
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connection_id = str(uuid.uuid4())
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try:
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# Accept connection and register with service
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await ws_service.connect(websocket, connection_id, user_id=user_id)
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# Send connection confirmation
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await ws_service.manager.send_personal_message(
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{
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"type": WebSocketMessageType.CONNECTED,
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"data": {
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"connection_id": connection_id,
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"message": "Connected to Aniworld WebSocket",
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},
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},
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connection_id,
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)
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logger.info(
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"WebSocket client connected",
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connection_id=connection_id,
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user_id=user_id,
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)
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# Handle incoming messages
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while True:
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try:
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# Receive message from client
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data = await websocket.receive_json()
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# Parse client message
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try:
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client_msg = ClientMessage(**data)
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except Exception as e:
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logger.warning(
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"Invalid client message format",
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connection_id=connection_id,
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error=str(e),
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)
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await ws_service.send_error(
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connection_id,
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"Invalid message format",
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"INVALID_MESSAGE",
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)
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continue
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# Handle room subscription requests
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if client_msg.action in ["join", "leave"]:
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try:
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room_req = RoomSubscriptionRequest(
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action=client_msg.action,
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room=client_msg.data.get("room", ""),
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)
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if room_req.action == "join":
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await ws_service.manager.join_room(
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connection_id, room_req.room
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)
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await ws_service.manager.send_personal_message(
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{
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"type": WebSocketMessageType.SYSTEM_INFO,
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"data": {
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"message": (
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f"Joined room: {room_req.room}"
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)
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},
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},
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connection_id,
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)
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elif room_req.action == "leave":
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await ws_service.manager.leave_room(
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connection_id, room_req.room
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)
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await ws_service.manager.send_personal_message(
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{
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"type": WebSocketMessageType.SYSTEM_INFO,
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"data": {
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"message": (
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f"Left room: {room_req.room}"
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)
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},
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},
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connection_id,
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)
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except Exception as e:
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logger.warning(
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"Invalid room subscription request",
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connection_id=connection_id,
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error=str(e),
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)
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await ws_service.send_error(
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connection_id,
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"Invalid room subscription",
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"INVALID_SUBSCRIPTION",
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)
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# Handle ping/pong for keepalive
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elif client_msg.action == "ping":
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await ws_service.manager.send_personal_message(
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{"type": WebSocketMessageType.PONG, "data": {}},
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connection_id,
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)
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else:
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logger.debug(
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"Unknown action from client",
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connection_id=connection_id,
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action=client_msg.action,
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)
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await ws_service.send_error(
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connection_id,
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f"Unknown action: {client_msg.action}",
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"UNKNOWN_ACTION",
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)
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except WebSocketDisconnect:
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logger.info(
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"WebSocket client disconnected",
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connection_id=connection_id,
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)
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break
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except Exception as e:
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logger.error(
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"Error handling WebSocket message",
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connection_id=connection_id,
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error=str(e),
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)
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await ws_service.send_error(
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connection_id,
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"Internal server error",
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"SERVER_ERROR",
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)
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except Exception as e:
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logger.error(
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"WebSocket connection error",
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connection_id=connection_id,
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error=str(e),
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)
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finally:
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# Cleanup connection
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await ws_service.disconnect(connection_id)
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logger.info("WebSocket connection closed", connection_id=connection_id)
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@router.get("/status")
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async def websocket_status(
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ws_service: WebSocketService = Depends(get_websocket_service),
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):
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"""Get WebSocket service status and statistics.
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Returns information about active connections and rooms.
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Useful for monitoring and debugging.
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"""
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connection_count = await ws_service.manager.get_connection_count()
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return JSONResponse(
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status_code=status.HTTP_200_OK,
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content={
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"status": "operational",
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"active_connections": connection_count,
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"supported_message_types": [t.value for t in WebSocketMessageType],
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},
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)
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