From f7534989771a614d4ff850f3226c263036d3bec8 Mon Sep 17 00:00:00 2001 From: mijinummi Date: Sat, 30 May 2026 04:16:02 +0100 Subject: [PATCH] docs(repo): remove scratch artifacts and consolidate canonical documentation --- SSE_IMPLEMENTATION.md | 214 -------------------------- backend/IMPLEMENTATION_COMPLETE.md | 232 ----------------------------- 2 files changed, 446 deletions(-) delete mode 100644 SSE_IMPLEMENTATION.md delete mode 100644 backend/IMPLEMENTATION_COMPLETE.md diff --git a/SSE_IMPLEMENTATION.md b/SSE_IMPLEMENTATION.md deleted file mode 100644 index 86cb2fe3..00000000 --- a/SSE_IMPLEMENTATION.md +++ /dev/null @@ -1,214 +0,0 @@ -# Real-Time Event Streaming Implementation - -This document summarizes the implementation of Issue #134: Backend SSE Stream Updates. - -## What Was Built - -A production-ready **Server-Sent Events (SSE)** system for real-time payment stream updates in FlowFi. - -## Quick Links - -- **Quick Start**: [`backend/SSE_README.md`](backend/SSE_README.md) -- **Full Implementation Guide**: [`backend/docs/SSE_IMPLEMENTATION.md`](backend/docs/SSE_IMPLEMENTATION.md) -- **Architecture Diagrams**: [`backend/docs/SSE_ARCHITECTURE.md`](backend/docs/SSE_ARCHITECTURE.md) -- **Production Checklist**: [`backend/PRODUCTION_CHECKLIST.md`](backend/PRODUCTION_CHECKLIST.md) -- **Complete Summary**: [`ISSUE_134_SUMMARY.md`](ISSUE_134_SUMMARY.md). - -## Try It Now - -```bash -# 1. Start the backend -cd backend -npm run dev - -# 2. In another terminal, subscribe to events -curl -N http://localhost:3001/events/subscribe?all=true - -# 3. In a third terminal, create a stream -curl -X POST http://localhost:3001/streams \ - -H "Content-Type: application/json" \ - -d '{ - "sender": "GABC...", - "recipient": "GDEF...", - "tokenAddress": "CUSDC...", - "ratePerSecond": "1000000", - "depositedAmount": "86400000000", - "startTime": 1708560000 - }' - -# You'll see the event in terminal 2! -``` - -Or open the visual test client: -```bash -open backend/test-sse-client.html -``` - -## API Endpoints - -### Subscribe to Events -``` -GET /events/subscribe?streams=1&streams=2 -GET /events/subscribe?users=GABC... -GET /events/subscribe?all=true -``` - -### Connection Statistics -``` -GET /events/stats -``` - -## Event Types - -- `stream.created` - New stream created -- `stream.topped_up` - Stream received additional funds -- `stream.withdrawn` - Funds withdrawn from stream -- `stream.cancelled` - Stream cancelled -- `stream.completed` - Stream completed - -## Client Integration - -### JavaScript -```javascript -const eventSource = new EventSource( - 'http://localhost:3001/events/subscribe?streams=1' -); - -eventSource.addEventListener('stream.created', (e) => { - const data = JSON.parse(e.data); - console.log('New stream:', data); -}); -``` - -### React -```typescript -import { useStreamEvents } from '@/hooks/useStreamEvents'; - -function StreamDashboard({ streamId }) { - const { events, connected } = useStreamEvents({ - streamIds: [streamId] - }); - - return ( -
-
Status: {connected ? '🟢 Connected' : '🔴 Disconnected'}
- {events.map((event, i) => ( -
{event.type}: {JSON.stringify(event.data)}
- ))} -
- ); -} -``` - -See [`backend/examples/useStreamEvents.tsx`](backend/examples/useStreamEvents.tsx) for the complete React hook. - -## Architecture - -``` -Blockchain Indexer - ↓ - Backend API - ↓ - SSE Service ──→ Client 1 - ↓ ──→ Client 2 - ↓ ──→ Client 3 - Redis Pub/Sub (for scaling) -``` - -## Performance - -- **10,000 connections** = ~100MB memory -- **1,000 events/sec** = minimal CPU impact -- **Per-connection overhead** = ~10KB - -## Production Readiness - -### Implemented ✅ -- Subscription filtering (by stream, user, or all) -- Automatic client cleanup on disconnect -- Connection statistics endpoint -- Error handling and validation -- OpenAPI documentation -- Test client and examples -- Reconnection strategy - -### Next Steps for Production -- Add JWT authentication -- Implement per-IP rate limits -- Add Redis for horizontal scaling -- Configure reverse proxy (nginx) -- Set up monitoring and alerts - -See [`backend/PRODUCTION_CHECKLIST.md`](backend/PRODUCTION_CHECKLIST.md) for the complete deployment guide. - -## Files Created - -### Core Implementation -- `backend/src/services/sse.service.ts` - SSE connection manager -- `backend/src/controllers/sse.controller.ts` - Subscription endpoint -- `backend/src/routes/events.routes.ts` - Events routes - -### Documentation -- `backend/docs/SSE_IMPLEMENTATION.md` - Full technical guide -- `backend/docs/SSE_ARCHITECTURE.md` - Architecture diagrams -- `backend/SSE_README.md` - Quick start guide -- `backend/IMPLEMENTATION_COMPLETE.md` - Implementation details -- `backend/PRODUCTION_CHECKLIST.md` - Deployment checklist - -### Examples & Testing -- `backend/examples/useStreamEvents.tsx` - Production-ready React hook -- `backend/services/indexer-integration.example.ts` - Blockchain integration example -- `backend/test-sse-client.html` - Visual test client - -## Next Integration Steps - -1. **Connect to Blockchain Indexer** - ```typescript - import { handleBlockchainEvent } from './services/indexer-integration.example.js'; - - // When your indexer detects a blockchain event - stellar.on('StreamCreated', (event) => { - handleBlockchainEvent({ - eventType: 'CREATED', - streamId: event.stream_id, - sender: event.sender, - recipient: event.recipient, - // ... other fields - }); - }); - ``` - -2. **Add to Frontend** - - Copy `backend/examples/useStreamEvents.tsx` to `frontend/src/hooks/` - - Use in dashboard components - - Display real-time balance updates - -3. **Deploy to Production** - - Follow `backend/PRODUCTION_CHECKLIST.md` - - Add authentication middleware - - Configure Redis for scaling - - Set up monitoring - -## Acceptance Criteria ✅ - -All requirements from Issue #134 have been met: - -- ✅ Clients can subscribe and see new events without full page reload -- ✅ Reconnection and backoff strategies documented -- ✅ Load implications documented (capacity, memory, CPU) -- ✅ Security implications documented (auth, rate limiting, DDoS) -- ✅ Gateway broadcasts events to subscribed clients -- ✅ Subscription filtering implemented - -## Support - -For questions or issues: -1. Check the documentation in `backend/docs/` -2. Review examples in `backend/examples/` -3. Test with `backend/test-sse-client.html` -4. See `ISSUE_134_SUMMARY.md` for complete overview - ---- - -**Status**: ✅ Complete and ready for integration -**Last Updated**: 2026-02-22 diff --git a/backend/IMPLEMENTATION_COMPLETE.md b/backend/IMPLEMENTATION_COMPLETE.md deleted file mode 100644 index dc708fac..00000000 --- a/backend/IMPLEMENTATION_COMPLETE.md +++ /dev/null @@ -1,232 +0,0 @@ -# Issue #134: Backend SSE Stream Updates - Implementation Complete ✅ - -## Summary - -Implemented **Server-Sent Events (SSE)** for real-time stream updates in FlowFi backend. - -## Architecture Decision - -**SSE over WebSockets** because: -- ✅ Unidirectional (server → client) matches DeFi streaming use case -- ✅ Simpler: automatic reconnection, HTTP-based, easier debugging -- ✅ Lower overhead for broadcasting updates -- ✅ Better infrastructure compatibility (HTTP/2, proxies, load balancers) -- ✅ Native browser support with EventSource API - -## Implementation - -### Core Components - -1. **SSE Service** (`src/services/sse.service.ts`) - - Client connection management - - Subscription filtering (by stream, user, or all) - - Targeted broadcasting - - Automatic cleanup on disconnect - -2. **SSE Controller** (`src/controllers/sse.controller.ts`) - - Handles `/events/subscribe` endpoint - - Validates subscription parameters with Zod - - Manages SSE connection headers - -3. **Events Routes** (`src/routes/events.routes.ts`) - - `GET /events/subscribe` - Subscribe to events - - `GET /events/stats` - Connection statistics - - Full OpenAPI documentation - -4. **Integration** (`src/controllers/stream.controller.ts`) - - Broadcasts events when streams are created/updated - - Notifies both sender and recipient - -### Event Types - -| Event | Description | -|-------|-------------| -| `stream.created` | New stream created | -| `stream.topped_up` | Stream received funds | -| `stream.withdrawn` | Funds withdrawn | -| `stream.cancelled` | Stream cancelled | -| `stream.completed` | Stream completed | - -## API Usage - -### Subscribe to Specific Streams -```bash -curl -N http://localhost:3001/events/subscribe?streams=1&streams=2 -``` - -### Subscribe to User Events -```bash -curl -N http://localhost:3001/events/subscribe?users=GABC... -``` - -### Subscribe to All Events -```bash -curl -N http://localhost:3001/events/subscribe?all=true -``` - -### Get Connection Stats -```bash -curl http://localhost:3001/events/stats -``` - -## Client Examples - -### JavaScript -```javascript -const eventSource = new EventSource( - 'http://localhost:3001/events/subscribe?streams=1' -); - -eventSource.addEventListener('stream.created', (e) => { - const data = JSON.parse(e.data); - console.log('New stream:', data); -}); -``` - -### React Hook -See `examples/useStreamEvents.tsx` for production-ready React hook with: -- Automatic reconnection with exponential backoff -- Event history management -- Connection state tracking -- TypeScript support - -## Testing - -1. **HTML Test Client**: `test-sse-client.html` - - Visual connection status - - Event log with timestamps - - Test stream creation button - -2. **Manual Testing**: - ```bash - # Terminal 1: Start backend - npm run dev - - # Terminal 2: Subscribe to events - curl -N http://localhost:3001/events/subscribe?all=true - - # Terminal 3: Create a stream - curl -X POST http://localhost:3001/streams \ - -H "Content-Type: application/json" \ - -d '{"sender":"GABC...","recipient":"GDEF...","tokenAddress":"CUSDC...","ratePerSecond":"1000000","depositedAmount":"86400000000","startTime":1708560000}' - ``` - -## Reconnection Strategy - -### Browser Default -- Automatic reconnection with exponential backoff -- Initial: ~1s, Max: ~30s - -### Production Implementation -```javascript -class SSEClient { - retryDelay = 1000; - maxRetryDelay = 30000; - - reconnect() { - setTimeout(() => { - this.connect(); - this.retryDelay = Math.min(this.retryDelay * 2, this.maxRetryDelay); - }, this.retryDelay); - } -} -``` - -## Load & Security - -### Capacity (Single Instance) -- **10,000 connections**: ~100MB memory -- **1,000 events/sec**: Minimal CPU -- **Per-connection overhead**: ~10KB - -### Security Recommendations -- [ ] Add JWT authentication -- [ ] Implement per-IP connection limits -- [ ] Use reverse proxy for DDoS protection -- [ ] Monitor connection count - -### Horizontal Scaling -For multi-instance deployments, add Redis pub/sub: -```typescript -// Publisher -redis.publish('stream-events', JSON.stringify({ event, data })); - -// Subscriber -subscriber.on('message', (channel, message) => { - const { event, data } = JSON.parse(message); - sseService.broadcast(event, data); -}); -``` - -## Documentation - -- **Full Guide**: `docs/SSE_IMPLEMENTATION.md` -- **Integration Example**: `services/indexer-integration.example.ts` -- **React Hook**: `examples/useStreamEvents.tsx` -- **Test Client**: `test-sse-client.html` - -## Acceptance Criteria ✅ - -- [x] Clients can subscribe and see new events without full page reload -- [x] Reconnection strategy documented (exponential backoff, 1s-30s) -- [x] Load implications documented (10K connections = 100MB) -- [x] Security implications documented (auth, rate limiting, DDoS) -- [x] Event broadcasting system implemented -- [x] Subscription filtering (stream, user, all) -- [x] Connection statistics endpoint -- [x] OpenAPI documentation -- [x] Test client provided -- [x] Production examples (React hook) - -## Next Steps - -1. **Integrate with Blockchain Indexer** - - Use `handleBlockchainEvent()` from `indexer-integration.example.ts` - - Connect to Stellar event listener - -2. **Add Authentication** - ```typescript - router.get('/subscribe', verifyToken, subscribe); - ``` - -3. **Production Deployment** - - Add Redis for horizontal scaling - - Configure reverse proxy (nginx) - - Set up monitoring/alerts - -4. **Frontend Integration** - - Copy `useStreamEvents.tsx` to frontend - - Add to stream dashboard components - - Display real-time balance updates - -## Files Created - -``` -backend/ -├── src/ -│ ├── services/ -│ │ ├── sse.service.ts # Core SSE service -│ │ └── indexer-integration.example.ts # Integration example -│ ├── controllers/ -│ │ └── sse.controller.ts # SSE endpoint -│ └── routes/ -│ └── events.routes.ts # Events routes -├── docs/ -│ └── SSE_IMPLEMENTATION.md # Full documentation -├── examples/ -│ └── useStreamEvents.tsx # React hook -├── test-sse-client.html # Test client -├── SSE_README.md # Quick start -└── IMPLEMENTATION_COMPLETE.md # This file -``` - -## Files Modified - -- `src/app.ts` - Added events routes -- `src/controllers/stream.controller.ts` - Added SSE broadcasting - ---- - -**Status**: ✅ Ready for production with authentication and Redis scaling -**Tested**: ✅ Manual testing with curl and HTML client -**Documented**: ✅ Complete with examples and best practices