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WebSocket & API Implementation Summary

Overview

Production-ready WebSocket support and comprehensive REST API have been successfully implemented for the Crypto API Monitoring System.

Files Created/Updated

1. `/home/user/crypto-dt-source/api/websocket.py` (NEW)

Comprehensive WebSocket implementation with:

Features:

WebSocket Endpoint: /ws/live - Real-time monitoring updates
Connection Manager: Handles multiple concurrent WebSocket connections
Message Types:
- connection_established - Sent when client connects
- status_update - Periodic system status (every 10 seconds)
- new_log_entry - Real-time log notifications
- rate_limit_alert - Rate limit warnings (≥80% usage)
- provider_status_change - Provider status change notifications
- ping - Heartbeat to keep connections alive (every 30 seconds)

Connection Management:

Auto-disconnect on errors
Graceful connection cleanup
Connection metadata tracking
Client ID assignment

Background Tasks:

Periodic broadcast loop (10-second intervals)
Heartbeat loop (30-second intervals)
Automatic rate limit monitoring
Status update broadcasting

2. `/home/user/crypto-dt-source/api/endpoints.py` (NEW)

Comprehensive REST API endpoints with:

Endpoint Categories:

Providers (/api/providers)

GET /api/providers - List all providers (with category filter)
GET /api/providers/{provider_name} - Get specific provider
GET /api/providers/{provider_name}/stats - Get provider statistics

System Status (/api/status)

GET /api/status - Current system status
GET /api/status/metrics - System metrics history

Rate Limits (/api/rate-limits)

GET /api/rate-limits - All provider rate limits
GET /api/rate-limits/{provider_name} - Specific provider rate limit

Logs (/api/logs)

GET /api/logs/{log_type} - Get logs (connection, failure, collection, rate_limit)

Alerts (/api/alerts)

GET /api/alerts - List alerts with filtering
POST /api/alerts/{alert_id}/acknowledge - Acknowledge alert

Scheduler (/api/scheduler)

GET /api/scheduler/status - Scheduler status
POST /api/scheduler/trigger/{job_id} - Trigger job immediately

Database (/api/database)

GET /api/database/stats - Database statistics
GET /api/database/health - Database health check

Analytics (/api/analytics)

GET /api/analytics/failures - Failure analysis

Configuration (/api/config)

GET /api/config/stats - Configuration statistics

3. `/home/user/crypto-dt-source/app.py` (UPDATED)

Production-ready FastAPI application with:

Application Configuration:

Title: Crypto API Monitoring System
Version: 2.0.0
Host: 0.0.0.0
Port: 7860
Documentation: Swagger UI at /docs, ReDoc at /redoc

Startup Sequence:

Initialize database (create tables)
Configure rate limiters for all providers
Populate database with provider configurations
Start WebSocket background tasks
Start task scheduler

Shutdown Sequence:

Stop task scheduler
Stop WebSocket background tasks
Close all WebSocket connections
Clean up resources

CORS Configuration:

Allow all origins (configurable for production)
Allow all methods
Allow all headers
Credentials enabled

Root Endpoints:

GET / - API information and endpoint listing
GET /health - Comprehensive health check
GET /info - Detailed system information

Middleware:

CORS middleware
Global exception handler

WebSocket Usage Example

JavaScript Client:

const ws = new WebSocket('ws://localhost:7860/ws/live');

ws.onopen = () => {
    console.log('Connected to WebSocket');
};

ws.onmessage = (event) => {
    const message = JSON.parse(event.data);

    switch(message.type) {
        case 'connection_established':
            console.log('Client ID:', message.client_id);
            break;

        case 'status_update':
            console.log('System Status:', message.system_metrics);
            break;

        case 'rate_limit_alert':
            console.warn(`Rate limit alert: ${message.provider} at ${message.percentage}%`);
            break;

        case 'provider_status_change':
            console.log(`Provider ${message.provider}: ${message.old_status} → ${message.new_status}`);
            break;

        case 'ping':
            // Respond with pong
            ws.send(JSON.stringify({ type: 'pong' }));
            break;
    }
};

ws.onclose = () => {
    console.log('Disconnected from WebSocket');
};

ws.onerror = (error) => {
    console.error('WebSocket error:', error);
};

Python Client:

import asyncio
import websockets
import json

async def websocket_client():
    uri = "ws://localhost:7860/ws/live"

    async with websockets.connect(uri) as websocket:
        while True:
            message = await websocket.recv()
            data = json.loads(message)

            if data['type'] == 'status_update':
                print(f"Status: {data['system_metrics']}")

            elif data['type'] == 'ping':
                # Respond with pong
                await websocket.send(json.dumps({'type': 'pong'}))

asyncio.run(websocket_client())

REST API Usage Examples

Get System Status:

curl http://localhost:7860/api/status

Get All Providers:

curl http://localhost:7860/api/providers

Get Provider Statistics:

curl http://localhost:7860/api/providers/CoinGecko/stats?hours=24

Get Rate Limits:

curl http://localhost:7860/api/rate-limits

Get Recent Logs:

curl "http://localhost:7860/api/logs/connection?hours=1&limit=100"

Get Alerts:

curl "http://localhost:7860/api/alerts?acknowledged=false&hours=24"

Acknowledge Alert:

curl -X POST http://localhost:7860/api/alerts/1/acknowledge

Trigger Scheduler Job:

curl -X POST http://localhost:7860/api/scheduler/trigger/health_checks

Running the Application

Development:

cd /home/user/crypto-dt-source
python3 app.py

Production (with Gunicorn):

gunicorn app:app -w 4 -k uvicorn.workers.UvicornWorker --bind 0.0.0.0:7860

Docker:

docker build -t crypto-monitor .
docker run -p 7860:7860 crypto-monitor

Testing

Health Check:

curl http://localhost:7860/health

Expected response:

{
  "status": "healthy",
  "timestamp": "2025-11-11T00:30:00.000000",
  "components": {
    "database": {"status": "healthy"},
    "scheduler": {"status": "running"},
    "websocket": {"status": "running", "active_connections": 0},
    "providers": {"total": 8, "online": 0, "degraded": 0, "offline": 0}
  }
}

WebSocket Stats:

curl http://localhost:7860/ws/stats

API Documentation:

Open browser to: http://localhost:7860/docs

Features Implemented

WebSocket Features:

✅ Real-time status updates (10-second intervals) ✅ Connection management (multiple clients) ✅ Heartbeat/ping-pong (30-second intervals) ✅ Auto-disconnect on errors ✅ Message broadcasting ✅ Client metadata tracking ✅ Background task management

REST API Features:

✅ Provider management endpoints ✅ System status and metrics ✅ Rate limit monitoring ✅ Log retrieval (multiple types) ✅ Alert management ✅ Scheduler control ✅ Database statistics ✅ Failure analytics ✅ Configuration stats

Application Features:

✅ FastAPI with full documentation ✅ CORS middleware (all origins) ✅ Database initialization on startup ✅ Rate limiter configuration ✅ Scheduler startup/shutdown ✅ WebSocket background tasks ✅ Graceful shutdown handling ✅ Global exception handling ✅ Comprehensive logging ✅ Health check endpoint ✅ System info endpoint

Architecture

┌─────────────────────────────────────────────────────────────┐
│                     FastAPI Application                      │
│                      (app.py:7860)                          │
├─────────────────────────────────────────────────────────────┤
│                                                              │
│  ┌──────────────────┐  ┌───────────────────┐              │
│  │  REST API        │  │  WebSocket        │              │
│  │  /api/*          │  │  /ws/live         │              │
│  │  (endpoints.py)  │  │  (websocket.py)   │              │
│  └────────┬─────────┘  └─────────┬─────────┘              │
│           │                       │                         │
│           └───────────┬───────────┘                         │
│                       │                                     │
├───────────────────────┼─────────────────────────────────────┤
│                       ▼                                     │
│  ┌─────────────────────────────────────────────────────┐  │
│  │           Core Services Layer                        │  │
│  ├─────────────────────────────────────────────────────┤  │
│  │  • Database Manager (db_manager)                     │  │
│  │  • Task Scheduler (task_scheduler)                   │  │
│  │  • Rate Limiter (rate_limiter)                       │  │
│  │  • Configuration (config)                            │  │
│  │  • Health Checker (health_checker)                   │  │
│  └─────────────────────────────────────────────────────┘  │
│                       │                                     │
├───────────────────────┼─────────────────────────────────────┤
│                       ▼                                     │
│  ┌─────────────────────────────────────────────────────┐  │
│  │              Data Layer                              │  │
│  ├─────────────────────────────────────────────────────┤  │
│  │  • SQLite Database (data/api_monitor.db)            │  │
│  │  • Providers, Logs, Metrics, Alerts                 │  │
│  └─────────────────────────────────────────────────────┘  │
│                                                              │
└─────────────────────────────────────────────────────────────┘

WebSocket Message Flow

Client                  Server                  Background Tasks
  │                       │                            │
  ├─────── Connect ──────>│                            │
  │<── connection_est. ───┤                            │
  │                       │                            │
  │                       │<──── Status Update ────────┤
  │<── status_update ─────┤      (10s interval)        │
  │                       │                            │
  │                       │<──── Heartbeat ────────────┤
  │<───── ping ───────────┤      (30s interval)        │
  ├────── pong ──────────>│                            │
  │                       │                            │
  │                       │<──── Rate Alert ───────────┤
  │<── rate_limit_alert ──┤      (when >80%)           │
  │                       │                            │
  │                       │<──── Provider Change ──────┤
  │<── provider_status ───┤      (on change)           │
  │                       │                            │
  ├──── Disconnect ──────>│                            │
  │                       │                            │

Dependencies

All required packages are in requirements.txt:

fastapi
uvicorn[standard]
websockets
sqlalchemy
apscheduler
aiohttp
python-dotenv

Security Considerations

CORS: Currently set to allow all origins. In production, specify allowed origins:
```
allow_origins=["https://yourdomain.com"]
```
API Keys: Masked in responses using _mask_key() method
Rate Limiting: Built-in per-provider rate limiting
WebSocket Authentication: Can be added by implementing token validation in connection handler
Database: SQLite is suitable for development. Consider PostgreSQL for production.

Monitoring & Observability

Logs: Comprehensive logging via utils.logger
Health Checks: /health endpoint with component status
Metrics: System metrics tracked in database
Alerts: Built-in alerting system
WebSocket Stats: /ws/stats endpoint

Next Steps (Optional Enhancements)

Add WebSocket authentication
Implement topic-based subscriptions
Add message queuing (Redis/RabbitMQ)
Implement horizontal scaling
Add Prometheus metrics export
Implement rate limiting per WebSocket client
Add message replay capability
Implement WebSocket reconnection logic
Add GraphQL API support
Implement API versioning

Troubleshooting

WebSocket won't connect:

Check firewall settings
Verify port 7860 is accessible
Check CORS configuration

Database errors:

Ensure data/ directory exists
Check file permissions
Verify SQLite is installed

Scheduler not starting:

Check database initialization
Verify provider configurations
Check logs for errors

High memory usage:

Limit number of WebSocket connections
Implement connection pooling
Adjust database cleanup settings

Implementation Date: 2025-11-11 Version: 2.0.0 Status: Production Ready ✅