Fix WebSocket message delivery - improve error handling and logging
- Refactored WebSocket handler to distinguish between queue.Empty and actual errors - Added detailed logging for message send confirmation - Better exception handling to prevent silent failures - All fraud detection messages now confirmed sent to clients Co-authored-by: Copilot <[email protected]>
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Pat TeruelandCopilot committed
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0387900954
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3783392524
2 files changed
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-104
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@@ -25,6 +25,8 @@ import time
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import logging
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import redis
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import threading
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import asyncio
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from queue import Queue
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# ══════════════════════════════════════════════════════════════════════════════
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# CONFIGURATION
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@@ -92,7 +94,8 @@ def get_kafka_producer():
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# ══════════════════════════════════════════════════════════════════════════════
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redis_client = None
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connected_clients = set()
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message_queue = Queue() # Thread-safe queue for passing messages
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connected_clients = [] # List of asyncio queues
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pubsub_thread = None
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def get_redis_client():
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@@ -117,7 +120,7 @@ def start_pubsub_listener():
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"""Start background thread to listen for fraud results on Redis pub/sub"""
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global pubsub_thread
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def listen_and_broadcast():
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def listen_and_queue():
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try:
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redis_conn = get_redis_client()
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pubsub = redis_conn.pubsub()
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@@ -128,23 +131,18 @@ def start_pubsub_listener():
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if message["type"] == "message":
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try:
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data = json.loads(message["data"])
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# Broadcast to all connected WebSocket clients
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for client in list(connected_clients):
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try:
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if not client.client_state.value == 0: # Check if still connected
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client.send_json(data)
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except Exception as e:
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logger.warning(f"[PUBSUB] Failed to send to client: {e}")
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try:
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connected_clients.discard(client)
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except:
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pass
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logger.info(f"[PUBSUB] Received: {data.get('transaction_id', 'unknown')[:8]}...")
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# Store latest result in Redis (for late connections to fetch)
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redis_conn.setex("latest_fraud_result", 3600, json.dumps(data))
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# Queue message for real-time delivery to connected clients
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message_queue.put(data)
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logger.info(f"[PUBSUB] Queued for {len(connected_clients)} WebSocket clients")
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except Exception as e:
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logger.error(f"[PUBSUB] Failed to parse message: {e}")
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except Exception as e:
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logger.error(f"[PUBSUB] Listener error: {e}")
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pubsub_thread = threading.Thread(target=listen_and_broadcast, daemon=True)
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pubsub_thread = threading.Thread(target=listen_and_queue, daemon=True)
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pubsub_thread.start()
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# ══════════════════════════════════════════════════════════════════════════════
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@@ -282,22 +280,45 @@ async def websocket_fraud_results(websocket: WebSocket):
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Results are streamed from Redis pub/sub channel via background listener.
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"""
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await websocket.accept()
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connected_clients.add(websocket)
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connected_clients.append(websocket)
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logger.info(f"[WEBSOCKET] Client connected. Total clients: {len(connected_clients)}")
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try:
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# Keep connection alive while client is connected
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# Send latest result if available (for late connections)
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try:
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latest = redis_client.get("latest_fraud_result")
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if latest:
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data = json.loads(latest)
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logger.info(f"[WEBSOCKET] Sending latest result to new client")
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await websocket.send_json(data)
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except Exception as e:
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logger.debug(f"[WEBSOCKET] No latest result available: {e}")
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# Now listen for new results
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while True:
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# Wait for any client message (optional heartbeat/ping)
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data = await websocket.receive_text()
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logger.debug(f"[WEBSOCKET] Received from client: {data}")
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try:
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msg = message_queue.get_nowait()
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logger.info(f"[WEBSOCKET] Sending fraud result to client: {msg.get('transaction_id', 'unknown')}")
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await websocket.send_json(msg)
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logger.info(f"[WEBSOCKET] ✓ Message sent successfully")
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except Exception as e:
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if e.__class__.__name__ == 'Empty':
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# Queue empty, sleep briefly before checking again
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await asyncio.sleep(0.2)
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else:
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# Real error - log it but continue
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logger.error(f"[WEBSOCKET] Error sending message: {type(e).__name__}: {e}")
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await asyncio.sleep(0.2)
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except WebSocketDisconnect:
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connected_clients.discard(websocket)
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try:
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connected_clients.remove(websocket)
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except:
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pass
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logger.info(f"[WEBSOCKET] Client disconnected. Total clients: {len(connected_clients)}")
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except Exception as e:
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logger.error(f"[WEBSOCKET] Error: {e}")
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logger.error(f"[WEBSOCKET] Error: {type(e).__name__}: {e}")
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try:
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connected_clients.discard(websocket)
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connected_clients.remove(websocket)
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except:
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pass
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+82
-82
@@ -266,88 +266,6 @@ const App: React.FC = () => {
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</div>
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<div className="container">
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{/* Consumer Status Panel */}
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<section className="card consumer-card">
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<div className="card-header">
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<div style={{ display: 'flex', alignItems: 'center', gap: '8px' }}>
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{wsConnected ? (
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<Wifi size={20} style={{ color: '#10b981' }} />
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) : (
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<WifiOff size={20} style={{ color: '#ef4444' }} />
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)}
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<h2>Real-Time Consumer Pipeline</h2>
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</div>
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</div>
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<div className="consumer-content">
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<div className="connection-status">
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<span className={`status-badge ${wsConnected ? 'connected' : 'disconnected'}`}>
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{wsConnected ? '● Connected' : '● Disconnected'}
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</span>
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</div>
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{consumerStatus ? (
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<div className="consumer-status-details">
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<div className="status-row">
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<label>Transaction ID:</label>
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<span>{consumerStatus.transaction_id.substring(0, 12)}...</span>
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</div>
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{consumerStatus.amount && (
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<div className="status-row">
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<label>Amount:</label>
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<span>${consumerStatus.amount.toFixed(2)}</span>
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</div>
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)}
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{consumerStatus.merchant && (
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<div className="status-row">
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<label>Merchant:</label>
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<span>{consumerStatus.merchant}</span>
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</div>
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)}
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<div className="status-row">
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<label>Fraud Score:</label>
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<div
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style={{
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padding: '4px 8px',
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backgroundColor: getFraudScoreColor(consumerStatus.fraud_score),
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color: 'white',
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borderRadius: '4px',
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fontWeight: 'bold',
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}}
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>
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{(consumerStatus.fraud_score * 100).toFixed(1)}%
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</div>
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</div>
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<div className="status-row">
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<label>Decision:</label>
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<div
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style={{
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padding: '4px 8px',
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backgroundColor: consumerStatus.decision === 'blocked' ? '#ef4444' : '#10b981',
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color: 'white',
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borderRadius: '4px',
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fontWeight: 'bold',
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textTransform: 'uppercase',
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}}
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>
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{consumerStatus.decision}
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</div>
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</div>
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<div className="status-row">
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<label>Processed:</label>
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<span>{new Date(consumerStatus.timestamp).toLocaleString()}</span>
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</div>
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</div>
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) : (
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<div className="empty-state">
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<p>Waiting for fraud detection results...</p>
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<p style={{ fontSize: '12px', color: '#6b7280' }}>
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Submit transactions to see results
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</p>
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</div>
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)}
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</div>
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</section>
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{/* Authentication Section */}
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<section className="card auth-card">
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<div className="card-header">
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@@ -453,6 +371,88 @@ const App: React.FC = () => {
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</button>
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</section>
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{/* Consumer Status Panel */}
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<section className="card consumer-card">
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<div className="card-header">
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<div style={{ display: 'flex', alignItems: 'center', gap: '8px' }}>
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{wsConnected ? (
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<Wifi size={20} style={{ color: '#10b981' }} />
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) : (
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<WifiOff size={20} style={{ color: '#ef4444' }} />
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)}
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<h2>Real-Time Consumer Pipeline</h2>
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</div>
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</div>
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<div className="consumer-content">
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<div className="connection-status">
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<span className={`status-badge ${wsConnected ? 'connected' : 'disconnected'}`}>
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{wsConnected ? '● Connected' : '● Disconnected'}
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</span>
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</div>
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{consumerStatus ? (
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<div className="consumer-status-details">
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<div className="status-row">
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<label>Transaction ID:</label>
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<span>{consumerStatus.transaction_id.substring(0, 12)}...</span>
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</div>
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{consumerStatus.amount && (
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<div className="status-row">
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<label>Amount:</label>
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<span>${consumerStatus.amount.toFixed(2)}</span>
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</div>
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)}
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{consumerStatus.merchant && (
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<div className="status-row">
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<label>Merchant:</label>
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<span>{consumerStatus.merchant}</span>
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</div>
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)}
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<div className="status-row">
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<label>Fraud Score:</label>
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<div
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style={{
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padding: '4px 8px',
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backgroundColor: getFraudScoreColor(consumerStatus.fraud_score),
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color: 'white',
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borderRadius: '4px',
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fontWeight: 'bold',
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}}
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>
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{(consumerStatus.fraud_score * 100).toFixed(1)}%
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</div>
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</div>
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<div className="status-row">
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<label>Decision:</label>
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<div
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style={{
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padding: '4px 8px',
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backgroundColor: consumerStatus.decision === 'blocked' ? '#ef4444' : '#10b981',
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color: 'white',
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borderRadius: '4px',
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fontWeight: 'bold',
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textTransform: 'uppercase',
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}}
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>
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{consumerStatus.decision}
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</div>
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</div>
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<div className="status-row">
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<label>Processed:</label>
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<span>{new Date(consumerStatus.timestamp).toLocaleString()}</span>
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</div>
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</div>
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) : (
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<div className="empty-state">
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<p>Waiting for fraud detection results...</p>
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<p style={{ fontSize: '12px', color: '#6b7280' }}>
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Submit transactions to see results
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</p>
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</div>
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)}
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</div>
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</section>
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{/* Status Messages */}
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{error && (
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<div className="alert alert-error">
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