feat(08-01): Health monitoring & logging infrastructure
- Set up Winston structured logging with console and file outputs - Create GET /api/health endpoint with uptime, database status, response times - Add request logging middleware (method, path, statusCode, duration) - Create health monitoring module with database connectivity checks - Log all HTTP requests with timing information - Log auth events (login, register) and data modifications - Replace console.log/error with structured logger calls - Update backend README with logging configuration documentation - Add tests for health endpoint and logging middleware - Logs directory: logs/combined.log and logs/error.log Deliverables met: ✓ Structured logging (Winston) integrated ✓ Enhanced health endpoint with uptime & database info ✓ Request logging middleware attached to all routes ✓ Comprehensive logging documentation in README.md ✓ Tests passing for health and logging functionality ✓ All critical operations logged with context
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@@ -8,7 +8,8 @@ The Gravl backend is a Node.js/Express application that provides:
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- REST API for exercise data management
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- User authentication and authorization
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- Integration with frontend via HTTP
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- Health check endpoint for deployment monitoring
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- Structured logging for monitoring and debugging
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- Health check endpoint with system metrics for deployment monitoring
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---
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@@ -56,6 +57,64 @@ See `.env.example` (if available) for all supported variables.
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---
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## Logging & Monitoring
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### Structured Logging (Winston)
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The backend uses Winston for structured logging with multiple transports:
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**Console Output (Development):**
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- Human-readable format with timestamps and color coding
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- Logs all INFO, WARN, ERROR, and DEBUG messages
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**File Output:**
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- `logs/combined.log` — All application logs
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- `logs/error.log` — Error-level logs only
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- Max file size: 5MB with 5 file rotation
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**Log Levels:**
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- `debug` — Development debugging info
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- `info` — General information events
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- `warn` — Warning conditions
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- `error` — Error conditions
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**Example Log Format:**
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```
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2026-03-03 18:21:00 [info] User registered { userId: 42, email: user@example.com }
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2026-03-03 18:21:15 [info] HTTP Request { method: 'GET', path: '/api/health', statusCode: 200, duration: '12ms' }
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```
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### Request Logging Middleware
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All HTTP requests are automatically logged with:
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- HTTP method and path
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- Response status code
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- Request duration (milliseconds)
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- Client IP address
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- User-Agent
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Example:
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```
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[info] HTTP Request { method: 'POST', path: '/api/logs', statusCode: 200, duration: '45ms' }
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```
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### Accessing Logs
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**Local Development:**
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```bash
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npm run dev # Logs print to console in real-time
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tail -f logs/combined.log # Follow all logs
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tail -f logs/error.log # Follow errors only
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```
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**Docker Container:**
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```bash
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docker logs -f gravl-backend # Real-time logs
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docker logs --tail 100 gravl-backend # Last 100 lines
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```
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---
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## API Endpoints
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### Health Check (Monitoring & Deployment)
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@@ -64,23 +123,46 @@ See `.env.example` (if available) for all supported variables.
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GET /api/health
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```
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Used by deployment scripts to verify the backend is running and responsive.
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Comprehensive health endpoint that returns system status, uptime, and database connectivity. Used by deployment scripts to verify backend is operational.
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**Response:**
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**Response (Healthy):**
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```json
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{
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"status": "ok",
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"timestamp": "2026-03-03T18:21:00Z"
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"status": "healthy",
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"uptime": 3600,
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"timestamp": "2026-03-03T18:21:00.000Z",
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"database": {
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"connected": true,
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"responseTime": "15ms"
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}
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}
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```
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**Status Codes:**
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- `200 OK` — Backend is healthy
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- `500 Internal Server Error` — Backend has errors (check logs)
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**Response (Degraded):**
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```json
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{
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"status": "degraded",
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"uptime": 3600,
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"timestamp": "2026-03-03T18:21:00.000Z",
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"database": {
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"connected": false,
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"error": "Connection timeout"
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}
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}
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```
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### Other Endpoints
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**Status Values:**
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- `healthy` — All systems operational (HTTP 200)
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- `degraded` — Some systems degraded but functional (HTTP 200)
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- `unhealthy` — Critical systems down (HTTP 503)
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(Document your API endpoints here; placeholder for now)
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**Response Fields:**
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- `status` — Overall health status
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- `uptime` — Seconds since application started
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- `timestamp` — ISO 8601 timestamp of check
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- `database.connected` — Boolean database connectivity status
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- `database.responseTime` — Database query response time
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- `database.error` — Error message if connection failed (optional)
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---
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@@ -91,6 +173,15 @@ npm test # Run all tests
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npm run test:watch # Run tests in watch mode
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```
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### Health & Logging Tests
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The test suite includes:
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- Health endpoint status validation
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- Uptime tracking accuracy
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- Database connectivity checking
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- Request logging middleware functionality
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- Error handling for database failures
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---
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## Docker
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@@ -110,6 +201,11 @@ docker run -p 3001:3001 \
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gravl-backend:latest
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```
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**Viewing logs from container:**
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```bash
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docker logs -f gravl-backend
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```
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### With Docker Compose
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See the root `docker-compose.yml` for multi-container setup.
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@@ -150,18 +246,21 @@ That guide includes:
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### Health Check Configuration
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The backend exposes a health check endpoint at `GET /api/health`. The deployment script (`scripts/deploy.sh`) waits up to 60 seconds for this endpoint to return HTTP 200.
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The backend exposes a comprehensive health check endpoint at `GET /api/health`. The deployment script (`scripts/deploy.sh`) waits up to 60 seconds for this endpoint to return HTTP 200.
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**In your backend code:**
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```javascript
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app.get('/api/health', (req, res) => {
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res.json({ status: 'ok', timestamp: new Date().toISOString() });
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// Auto-integrated in src/index.js
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app.get('/api/health', async (req, res) => {
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const health = await getHealthStatus(pool);
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const statusCode = health.status === 'healthy' ? 200 : 503;
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res.status(statusCode).json(health);
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});
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```
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**Deployment timeout:** 60 seconds (12 retries × 5 seconds)
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- If this endpoint takes >5 seconds to respond, deployment will timeout
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- Ensure health check is lightweight (no expensive DB queries)
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- Health check is lightweight and includes database connectivity test
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---
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@@ -170,37 +269,21 @@ app.get('/api/health', (req, res) => {
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```
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backend/
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├── src/
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│ ├── index.js # Server entry point
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│ ├── routes/ # API endpoints
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│ ├── controllers/ # Business logic
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│ ├── models/ # Data models (if using ORM)
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│ └── middleware/ # Express middleware
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├── test/ # Test files
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├── Dockerfile # Container image definition
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├── package.json # Dependencies
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└── README.md # This file
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```
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---
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## Logs
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### Local Development
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```bash
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npm run dev # Logs to stdout
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```
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### Docker Container
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```bash
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docker logs gravl-backend # Current logs
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docker logs -f gravl-backend # Follow logs in real-time
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docker logs --tail 50 gravl-backend # Last 50 lines
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```
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### In Deployment
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All deploy activity is logged to `logs/deploy.log` at the root:
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```bash
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tail logs/deploy.log
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│ ├── index.js # Server entry point
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│ ├── utils/
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│ │ ├── logger.js # Winston logger configuration
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│ │ └── health.js # Health monitoring utilities
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│ ├── middleware/
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│ │ └── requestLogger.js # HTTP request logging middleware
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│ ├── routes/ # API endpoints
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│ ├── controllers/ # Business logic
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│ ├── models/ # Data models (if using ORM)
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│ └── services/ # External integrations
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├── test/ # Test files
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├── logs/ # Log files (created at runtime)
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├── Dockerfile # Container image definition
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├── package.json # Dependencies
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└── README.md # This file
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```
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---
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@@ -220,19 +303,42 @@ tail logs/deploy.log
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2. **Backend code has a syntax error**
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```bash
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npm run dev # Look for error messages
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npm run dev # Look for error messages in logs
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tail -f logs/error.log
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```
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3. **Health check endpoint is not implemented**
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- Ensure `app.get('/api/health', ...)` is in src/index.js
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3. **Database connection is failing**
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- Backend is stuck trying to connect to DB
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- Check `DB_HOST`, `DB_PORT`, `DB_USER`, `DB_PASSWORD` in `.env`
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- Ensure database is running and accessible
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4. **Database connection is failing**
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- Backend might be stuck trying to connect to DB
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- Check `DATABASE_URL` in `.env`
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- Ensure database is running
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4. **Logs directory not writable**
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```bash
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mkdir -p logs
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chmod 755 logs
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```
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See **[`docs/DEPLOYMENT.md`](../docs/DEPLOYMENT.md#troubleshooting)** for more deployment troubleshooting.
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### Checking Logs for Errors
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**Console (Development):**
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```bash
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npm run dev # Full logs with colors
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```
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**Log Files:**
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```bash
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tail -50 logs/combined.log # Last 50 lines of all logs
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tail -50 logs/error.log # Last 50 lines of errors only
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grep "ERROR" logs/combined.log # Find all error messages
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```
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**Docker:**
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```bash
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docker logs gravl-backend | grep ERROR
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```
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---
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## Contributing
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@@ -251,3 +357,4 @@ See the root project README or CONTRIBUTING.md for guidelines on:
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---
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*Last updated: 2026-03-03*
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*Phase 08-01: Health Monitoring & Logging Infrastructure*
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Reference in New Issue
Block a user