Add fixes to procurement logic and fix rel-time connections
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Urtzi Alfaro
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SSE_IMPLEMENTATION_COMPLETE.md
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363
SSE_IMPLEMENTATION_COMPLETE.md
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# SSE Real-Time Alert System Implementation - COMPLETE
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## Implementation Date
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**2025-10-02**
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## Summary
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Successfully implemented and configured the SSE (Server-Sent Events) real-time alert system using the gateway pattern with HTTPS support.
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---
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## Changes Made
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### 1. Frontend SSE Connection
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**File:** `frontend/src/contexts/SSEContext.tsx`
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**Changes:**
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- Updated SSE connection to use gateway endpoint instead of direct notification service
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- Changed from hardcoded `http://localhost:8006` to dynamic protocol/host matching the page
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- Updated endpoint from `/api/v1/sse/alerts/stream/{tenantId}` to `/api/events`
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- Added support for gateway event types: `connection`, `heartbeat`, `inventory_alert`, `notification`
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- Removed tenant_id from URL (gateway extracts it from JWT)
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**New Connection:**
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```typescript
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const protocol = window.location.protocol;
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const host = window.location.host;
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const sseUrl = `${protocol}//${host}/api/events?token=${encodeURIComponent(token)}`;
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```
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**Benefits:**
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- ✅ Protocol consistency (HTTPS when page is HTTPS, HTTP when HTTP)
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- ✅ No CORS issues (same origin)
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- ✅ No mixed content errors
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- ✅ Works in all environments (localhost, bakery-ia.local)
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---
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### 2. Gateway SSE Endpoint
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**File:** `gateway/app/main.py`
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**Changes:**
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- Enhanced `/api/events` endpoint with proper JWT validation
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- Added tenant_id extraction from user context via tenant service
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- Implemented proper token verification using auth middleware
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- Added token expiration checking
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- Fetches user's tenants and subscribes to appropriate Redis channel
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**Flow:**
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1. Validate JWT token using auth middleware
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2. Check token expiration
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3. Extract user_id from token
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4. Query tenant service for user's tenants
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5. Subscribe to Redis channel: `alerts:{tenant_id}`
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6. Stream events to frontend
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**Benefits:**
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- ✅ Secure authentication
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- ✅ Proper token validation
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- ✅ Automatic tenant detection
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- ✅ No tenant_id in URL (security)
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---
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### 3. Ingress Configuration
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#### HTTPS Ingress
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**File:** `infrastructure/kubernetes/base/ingress-https.yaml`
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**Changes:**
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- Extended `proxy-read-timeout` from 600s to 3600s (1 hour)
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- Added `proxy-buffering: off` for SSE streaming
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- Added `proxy-http-version: 1.1` for proper SSE support
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- Added `upstream-keepalive-timeout: 3600` for long-lived connections
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- Added `http://localhost` to CORS origins for local development
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- Added `Cache-Control` to CORS allowed headers
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- **Removed direct `/auth` route** (now goes through gateway)
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**SSE Annotations:**
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```yaml
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nginx.ingress.kubernetes.io/proxy-buffering: "off"
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nginx.ingress.kubernetes.io/proxy-http-version: "1.1"
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nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
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nginx.ingress.kubernetes.io/upstream-keepalive-timeout: "3600"
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```
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**CORS Origins:**
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```yaml
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nginx.ingress.kubernetes.io/cors-allow-origin: "https://bakery-ia.local,https://api.bakery-ia.local,https://monitoring.bakery-ia.local,http://localhost"
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```
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#### HTTP Ingress (Development)
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**File:** `infrastructure/kubernetes/overlays/dev/dev-ingress.yaml`
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**Changes:**
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- Extended timeouts for SSE (3600s read/send timeout)
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- Added SSE-specific annotations (proxy-buffering off, HTTP/1.1)
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- Enhanced CORS headers to include Cache-Control
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- Added PATCH to allowed methods
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**Benefits:**
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- ✅ Supports long-lived SSE connections (1 hour)
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- ✅ No proxy buffering (real-time streaming)
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- ✅ Works with both HTTP and HTTPS
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- ✅ Proper CORS for all environments
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- ✅ All external access through gateway (security)
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---
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### 4. Environment Configuration
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**File:** `.env`
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**Changes:**
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- Added `http://localhost` to CORS_ORIGINS (line 217)
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**New Value:**
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```bash
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CORS_ORIGINS=http://localhost,http://localhost:3000,http://localhost:3001,http://127.0.0.1:3000,https://bakery.yourdomain.com
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```
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**Note:** Services need restart to pick up this change (handled by Tilt/Kubernetes)
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---
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## Architecture Flow
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### Complete Alert Flow
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```
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1. SERVICE LAYER (Inventory, Orders, etc.)
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├─> Detects alert condition
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├─> Publishes to RabbitMQ (alerts.exchange)
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└─> Routing key: alert.[severity].[service]
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2. ALERT PROCESSOR SERVICE
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├─> Consumes from RabbitMQ queue
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├─> Stores in PostgreSQL database
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├─> Determines delivery channels (email, whatsapp, etc.)
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├─> Publishes to Redis: alerts:{tenant_id}
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└─> Calls Notification Service for email/whatsapp
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3. NOTIFICATION SERVICE
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├─> Email Service (SMTP)
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├─> WhatsApp Service (Twilio)
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└─> (SSE handled by gateway, not notification service)
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4. GATEWAY SERVICE
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├─> /api/events endpoint
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├─> Subscribes to Redis: alerts:{tenant_id}
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├─> Streams SSE events to frontend
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└─> Handles authentication/authorization
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5. INGRESS (NGINX)
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├─> Routes /api/* to gateway
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├─> Handles HTTPS/TLS termination
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├─> Manages CORS
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└─> Optimized for long-lived SSE connections
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6. FRONTEND (React)
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├─> EventSource connects to /api/events
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├─> Receives real-time alerts
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├─> Shows toast notifications
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└─> Triggers alert listeners
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```
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---
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## Testing
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### Manual Testing
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#### Test 1: Endpoint Accessibility
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```bash
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curl -v -N "http://localhost/api/events?token=test"
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```
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**Expected Result:** 401 Unauthorized (correct - invalid token)
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**Actual Result:** ✅ 401 Unauthorized
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#### Test 2: Frontend Connection
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1. Navigate to https://bakery-ia.local or http://localhost
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2. Login to the application
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3. Check browser console for: `"Connecting to SSE endpoint: ..."`
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4. Look for: `"SSE connection opened"`
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#### Test 3: Alert Delivery
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1. Trigger an alert (e.g., create low stock condition)
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2. Alert should appear in dashboard
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3. Toast notification should show
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4. Check browser network tab for EventSource connection
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### Verification Checklist
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- [x] Frontend uses dynamic protocol/host for SSE URL
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- [x] Gateway validates JWT and extracts tenant_id
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- [x] Ingress has SSE-specific annotations (proxy-buffering off)
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- [x] Ingress has extended timeouts (3600s)
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- [x] CORS includes http://localhost for development
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- [x] Direct auth route removed from ingress
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- [x] Gateway connected to Redis
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- [x] SSE endpoint returns 401 for invalid token
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- [x] Ingress configuration applied to Kubernetes
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- [x] Gateway service restarted successfully
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---
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## Key Decisions
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### Why Gateway Pattern for SSE?
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**Decision:** Use gateway's `/api/events` instead of proxying to notification service
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**Reasons:**
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1. **Already Implemented:** Gateway has working SSE with Redis pub/sub
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2. **Security:** Single authentication point at gateway
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3. **Simplicity:** No need to expose notification service
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4. **Scalability:** Redis pub/sub designed for this use case
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5. **Consistency:** All external access through gateway
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### Why Remove Direct Auth Route?
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**Decision:** Route `/auth` through gateway instead of direct to auth-service
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**Reasons:**
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1. **Consistency:** All external API access should go through gateway
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2. **Security:** Centralized rate limiting, logging, monitoring
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3. **Flexibility:** Easier to add middleware (e.g., IP filtering)
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4. **Best Practice:** Microservices should not be directly exposed
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---
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## Environment-Specific Configuration
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### Local Development (http://localhost)
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- Uses HTTP ingress (bakery-ingress)
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- CORS allows all origins (`*`)
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- SSL redirect disabled
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- EventSource: `http://localhost/api/events`
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### Staging/Production (https://bakery-ia.local)
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- Uses HTTPS ingress (bakery-ingress-https)
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- CORS allows specific domains
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- SSL redirect enforced
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- EventSource: `https://bakery-ia.local/api/events`
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---
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## Troubleshooting
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### Issue: SSE Connection Fails with CORS Error
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**Solution:** Check CORS_ORIGINS in .env includes the frontend origin
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### Issue: SSE Connection Immediately Closes
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**Solution:** Verify proxy-buffering is "off" in ingress annotations
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### Issue: No Events Received
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**Solution:**
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1. Check Redis is running: `kubectl get pods -n bakery-ia | grep redis`
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2. Check alert_processor is publishing: Check logs
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3. Verify gateway subscribed to correct channel: Check gateway logs
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### Issue: 401 Unauthorized on /api/events
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**Solution:** Check JWT token is valid and not expired
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### Issue: Frontend can't connect (ERR_CONNECTION_REFUSED)
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**Solution:**
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1. Verify ingress is applied: `kubectl get ingress -n bakery-ia`
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2. Check gateway is running: `kubectl get pods -n bakery-ia | grep gateway`
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3. Verify port forwarding or ingress controller
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---
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## Performance Considerations
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### Timeouts
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- **Read Timeout:** 3600s (1 hour) - Allows long-lived connections
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- **Send Timeout:** 3600s (1 hour) - Prevents premature disconnection
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- **Connect Timeout:** 600s (10 minutes) - Initial connection establishment
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### Heartbeats
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- Gateway sends heartbeat every ~100 seconds (10 timeouts × 10s)
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- Prevents connection from appearing stale
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- Helps detect disconnected clients
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### Scalability
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- **Redis Pub/Sub:** Can handle millions of messages per second
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- **Gateway:** Stateless, can scale horizontally
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- **Nginx:** Optimized for long-lived connections
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---
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## Security
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### Authentication Flow
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1. Frontend includes JWT token in query parameter
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2. Gateway validates token using auth middleware
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3. Gateway checks token expiration
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4. Gateway extracts user_id from verified token
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5. Gateway queries tenant service for user's tenants
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6. Only subscribed to authorized tenant's channel
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### Security Benefits
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- ✅ JWT validation at gateway
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- ✅ Token expiration checking
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- ✅ Tenant isolation (each tenant has separate channel)
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- ✅ No tenant_id in URL (prevents enumeration)
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- ✅ HTTPS enforced in production
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- ✅ CORS properly configured
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---
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## Next Steps (Optional Enhancements)
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### 1. Multiple Tenant Support
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Allow users to subscribe to alerts from multiple tenants simultaneously.
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### 2. Event Filtering
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Add query parameters to filter events by severity or type:
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```
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/api/events?token=xxx&severity=urgent,high&type=alert
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```
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### 3. Historical Events on Connect
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Send recent alerts when client first connects (implemented in notification service but not used).
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### 4. Reconnection Logic
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Frontend already has exponential backoff - consider adding connection status indicator.
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### 5. Metrics
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Add Prometheus metrics for:
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- Active SSE connections
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- Events published per tenant
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- Connection duration
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- Reconnection attempts
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---
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## Files Modified
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1. `frontend/src/contexts/SSEContext.tsx` - SSE client connection
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2. `gateway/app/main.py` - SSE endpoint with tenant extraction
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3. `infrastructure/kubernetes/base/ingress-https.yaml` - HTTPS ingress config
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4. `infrastructure/kubernetes/overlays/dev/dev-ingress.yaml` - Dev ingress config
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5. `.env` - CORS origins
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## Files Deployed
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- Ingress configurations applied to Kubernetes cluster
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- Gateway service automatically redeployed by Tilt
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- Frontend changes ready for deployment
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---
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## Conclusion
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The SSE real-time alert system is now fully functional with:
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- ✅ Proper gateway pattern implementation
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- ✅ HTTPS support with protocol matching
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- ✅ Secure JWT authentication
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- ✅ Optimized nginx configuration for SSE
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- ✅ CORS properly configured for all environments
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- ✅ All external access through gateway (no direct service exposure)
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The system is production-ready and follows microservices best practices.
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