pedidos-express/routes/chat.py

import asyncio
import json
import logging
from fastapi import Query, Request, HTTPException, Depends, APIRouter, WebSocket, WebSocketDisconnect
from fastapi.responses import JSONResponse
from fastapi.security import HTTPAuthorizationCredentials
from pydantic import BaseModel, ConfigDict
from broadcaster import Broadcast

from models.chat import ChatCompletionRequest
from models.user import User
from services.openai_service.openai_service import generate_completion
from auth.security import get_current_user
from config.messages import SuccessResponse
from redis import Redis

logger = logging.getLogger(__name__)
chat_router = APIRouter()

redis_client = Redis(host='localhost', port=6379, db=0, decode_responses=True)




@chat_router.websocket("/ws")
async def chat_irc_endpoint(websocket: WebSocket):
    """WebSocket endpoint for real-time chat interactions"""
    global connected_users
    
    
    # Backend de broadcast con Redis
    broadcast = Broadcast("redis://localhost:6379")
    logger.info("New WebSocket connection attempt")
    logger.debug(f"WebSocket query params: {websocket.query_params}")

    current_user = await get_current_user(
        HTTPAuthorizationCredentials(
            scheme="Bearer",
            credentials=websocket.query_params.get("token", "")
        )
    )
    if not current_user:
        await websocket.close(code=1008)  # Policy Violation
        return

    await websocket.accept()
    logger.info(f"User {current_user.email} connected to WebSocket chat.")

    username = None
    async def reader():
        """Lee mensajes desde Redis y los manda al WebSocket"""
        logger.info("Iniciando lector de mensajes")
        async with broadcast.subscribe(channel="chat") as subscriber:
            logger.info("Subscribed to Redis channel 'chat'")
            logger.debug("Starting message read loop")
            async for event in subscriber:
                try:
                    logger.debug(f"Broadcasting message to WebSocket: {event.message}")
                    await websocket.send_text(event.message)
                except Exception:
                    logger.error("Error sending message to WebSocket, closing connection.")
                    break
    await broadcast.connect()
    reader_task = asyncio.create_task(reader())


    try:
        while True:
            try:
                
                data = await asyncio.wait_for(websocket.receive_text(), timeout=30.0)
                payload = json.loads(data)
                event_type = payload.get("type")
                logger.debug(f"Received event: {event_type} with payload: {payload}")
                if event_type == "join":
                    logger.info(f"User {payload['username']} joined the chat.")
                    data = {
                        "mail": current_user.email,
                        "username": payload["username"]
                    }
                    redis_client.sadd("connected_users", json.dumps(data))
                    response = {"type": "join", "username": payload["username"]}

                elif event_type == "message":
                    logger.debug(f"Message from {payload['username']}: {payload['message']}")
                    message_username = payload["username"]
                    message = payload["message"]
                    response = {"type": "message", "username": message_username, "message": message}

                elif event_type == "leave":
                    logger.info(f"User {payload['username']} left the chat.")
                    message_username = payload["username"]
                    
                    users = redis_client.smembers("connected_users")
                    for user in users:
                        user_data = json.loads(user)
                        if user_data["username"] == message_username:
                            redis_client.srem("connected_users", user)
                            break
                    response = {"type": "leave", "username": message_username}
                    await websocket.close()
                    break
                elif event_type == "ai_message":
                    logger.debug(f"IA Message from {payload['username']}: {payload['messages']}")
                    message_username = payload["username"]
                    messages = payload["messages"]
                    response_content = await generate_completion(messages, current_user)
                    response = {"type": "message", "username": "IAKlein", "message": response_content}
                elif event_type == "mention":
                    logger.debug(f"Mention to {payload['username']}")
                    mention_username = payload["username"]
                    logger.debug(f"Mention username: {mention_username}, Current username: {username}")
                    await broadcast.publish(channel="chat", message=json.dumps({"type": "mentioned", "username": mention_username}))
                    continue
                elif event_type == "pong":
                    logger.debug(f"Received pong from user {current_user.email}")
                    continue

                # Publicar en Redis
                await broadcast.publish(channel="chat", message=json.dumps(response))

            except asyncio.TimeoutError:
                await websocket.send_text(json.dumps({"type": "ping"}))

    except WebSocketDisconnect:
        logger.info(f"User {current_user.email} disconnected from WebSocket chat.")
        
        users = redis_client.smembers("connected_users")
        for user in users:
            user_data = json.loads(user)
            if user_data["mail"] == current_user.email:
                redis_client.srem("connected_users", user)
                break
        response = {"type": "leave", "username": user_data["username"]}
        await broadcast.publish(channel="chat", message=json.dumps(response))

    finally:
        reader_task.cancel()
        await broadcast.disconnect()


@chat_router.get("/users")
async def get_connected_users(q: str = Query(...), _: User = Depends(get_current_user)):
    """Get a list of connected users (solo local al worker)"""
    # return {"users": [user.username for user in connected_users if q.lower() in user.username.lower()]}
    all_users = redis_client.smembers("connected_users")
    all_users = [json.loads(user)["username"] for user in all_users]
    filtered_users = [user for user in all_users if q.lower() in user.lower()]
    return {"users": filtered_users}