121 lines
4.3 KiB
Python
121 lines
4.3 KiB
Python
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"""
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WebSocket Connection Manager for Training Service
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Manages WebSocket connections and broadcasts RabbitMQ events to connected clients
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"""
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import asyncio
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import json
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from typing import Dict, Set
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from fastapi import WebSocket
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import structlog
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logger = structlog.get_logger()
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class WebSocketConnectionManager:
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"""
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Simple WebSocket connection manager.
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Manages connections per job_id and broadcasts messages to all connected clients.
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"""
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def __init__(self):
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# Structure: {job_id: {websocket_id: WebSocket}}
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self._connections: Dict[str, Dict[int, WebSocket]] = {}
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self._lock = asyncio.Lock()
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# Store latest event for each job to provide initial state
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self._latest_events: Dict[str, dict] = {}
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async def connect(self, job_id: str, websocket: WebSocket) -> None:
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"""Register a new WebSocket connection for a job"""
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await websocket.accept()
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async with self._lock:
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if job_id not in self._connections:
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self._connections[job_id] = {}
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ws_id = id(websocket)
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self._connections[job_id][ws_id] = websocket
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# Send initial state if available
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if job_id in self._latest_events:
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try:
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await websocket.send_json({
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"type": "initial_state",
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"job_id": job_id,
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"data": self._latest_events[job_id]
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})
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except Exception as e:
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logger.warning("Failed to send initial state to new connection", error=str(e))
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logger.info("WebSocket connected",
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job_id=job_id,
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websocket_id=ws_id,
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total_connections=len(self._connections[job_id]))
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async def disconnect(self, job_id: str, websocket: WebSocket) -> None:
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"""Remove a WebSocket connection"""
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async with self._lock:
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if job_id in self._connections:
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ws_id = id(websocket)
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self._connections[job_id].pop(ws_id, None)
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# Clean up empty job connections
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if not self._connections[job_id]:
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del self._connections[job_id]
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logger.info("WebSocket disconnected",
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job_id=job_id,
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websocket_id=ws_id,
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remaining_connections=len(self._connections.get(job_id, {})))
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async def broadcast(self, job_id: str, message: dict) -> int:
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"""
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Broadcast a message to all connections for a specific job.
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Returns the number of successful broadcasts.
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"""
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# Store the latest event for this job to provide initial state to new connections
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if message.get('type') != 'initial_state': # Don't store initial_state messages
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self._latest_events[job_id] = message
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if job_id not in self._connections:
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logger.debug("No active connections for job", job_id=job_id)
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return 0
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connections = list(self._connections[job_id].values())
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successful_sends = 0
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failed_websockets = []
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for websocket in connections:
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try:
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await websocket.send_json(message)
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successful_sends += 1
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except Exception as e:
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logger.warning("Failed to send message to WebSocket",
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job_id=job_id,
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error=str(e))
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failed_websockets.append(websocket)
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# Clean up failed connections
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if failed_websockets:
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async with self._lock:
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for ws in failed_websockets:
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ws_id = id(ws)
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self._connections[job_id].pop(ws_id, None)
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if successful_sends > 0:
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logger.info("Broadcasted message to WebSocket clients",
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job_id=job_id,
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message_type=message.get('type'),
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successful_sends=successful_sends,
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failed_sends=len(failed_websockets))
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return successful_sends
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def get_connection_count(self, job_id: str) -> int:
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"""Get the number of active connections for a job"""
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return len(self._connections.get(job_id, {}))
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# Global singleton instance
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websocket_manager = WebSocketConnectionManager()
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