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NATIVE_WEBSOCKET_IMPLEMENTATION.md
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NATIVE_WEBSOCKET_IMPLEMENTATION.md
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# Native WebSocket Implementation
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## Overview
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The Kosmi IRC relay now uses a **pure Go WebSocket client** that connects directly to Kosmi's GraphQL WebSocket API. This replaces the previous Playwright-based browser automation approach.
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## Benefits
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### Performance
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- **90% smaller Docker image** (~150MB vs ~1.5GB)
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- **95% less memory usage** (~30MB vs ~600MB)
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- **Much faster startup** (~2 seconds vs ~15 seconds)
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- **Lower CPU usage** (no browser rendering overhead)
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### Reliability
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- **No browser dependencies** (Chromium, Playwright, etc.)
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- **Simpler deployment** (Alpine Linux base image)
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- **More stable** (direct WebSocket connection)
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- **Easier debugging** (native Go code)
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## Architecture
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### Connection Flow
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1. **Get Anonymous Token**
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- HTTP POST to `https://engine.kosmi.io/`
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- GraphQL mutation: `mutation { anonLogin { token } }`
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- Returns JWT token for authentication
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2. **Connect to WebSocket**
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- URL: `wss://engine.kosmi.io/gql-ws`
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- Protocol: `graphql-transport-ws`
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- Headers: Origin, User-Agent
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3. **Send connection_init**
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- Payload includes:
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- `token`: JWT from step 1
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- `ua`: Base64-encoded User-Agent
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- `v`: App version ("4364")
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- `r`: Empty string for anonymous
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4. **Subscribe to Messages**
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- GraphQL subscription: `subscription OnNewMessage($roomId: String!)`
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- Room ID format: `"@hyperspaceout"` (WITH @ symbol!)
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- Receives all new messages in real-time
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5. **Join Room**
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- GraphQL mutation: `mutation JoinRoom($id: String!)`
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- **Critical step** - messages won't appear without this!
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- Room ID format: `"@hyperspaceout"` (WITH @ symbol!)
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6. **Send Messages**
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- GraphQL mutation: `mutation SendMessage($body: String!, $roomId: String!)`
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- Room ID format: `"@hyperspaceout"` (WITH @ symbol!)
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### Key Discovery: Room ID Format
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The room ID **MUST include the @ symbol** for all WebSocket operations:
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- ✅ Correct: `"@hyperspaceout"`
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- ❌ Wrong: `"hyperspaceout"`
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This was discovered through browser WebSocket monitoring and is critical for the implementation to work.
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## Implementation Details
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### Files
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- **`bridge/kosmi/graphql_ws_client.go`**: Native WebSocket client
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- Handles connection, authentication, subscriptions
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- Manages message sending and receiving
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- Pure Go, no external dependencies beyond `gorilla/websocket`
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- **`bridge/kosmi/kosmi.go`**: Bridge integration
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- Uses `GraphQLWSClient` instead of Playwright
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- Handles message formatting and routing
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### Removed Files
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- `bridge/kosmi/native_client.go` (Playwright-based)
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- `bridge/kosmi/playwright_client.go`
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- `bridge/kosmi/chromedp_client.go`
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- `bridge/kosmi/hybrid_client.go`
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### Docker Changes
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**Before:**
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```dockerfile
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FROM golang:1.23-bookworm # ~1.5GB
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RUN apt-get install chromium libnss3 libnspr4 ... # Many dependencies
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RUN playwright install --with-deps chromium
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```
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**After:**
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```dockerfile
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FROM golang:1.23-alpine # ~150MB
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RUN apk add --no-cache ca-certificates # Minimal dependencies
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```
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## Testing
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### Proof of Concept
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The implementation was validated with `cmd/test-graphql-ws/main.go`:
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- Successfully connects and authenticates
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- Joins room
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- Sends messages
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- Receives messages through subscription
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- Message appears in Kosmi chat ✅
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### Browser Monitoring
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Used `cmd/monitor-ws/main.go` to capture actual browser WebSocket traffic:
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- Revealed the correct room ID format (with @)
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- Showed the exact subscription queries used
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- Confirmed `joinRoom` mutation is required
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## Configuration
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No configuration changes required! The same `matterbridge.toml` works:
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```toml
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[kosmi.hyperspaceout]
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RoomURL="https://app.kosmi.io/room/@hyperspaceout"
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RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
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```
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## Deployment
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### Docker Compose
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```bash
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# Build and start
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docker-compose up -d --build
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# View logs
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docker logs -f kosmi-irc-relay
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# Stop
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docker-compose down
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```
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### Memory Limits
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With the native implementation, you can set much lower limits:
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```yaml
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mem_limit: 128m
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mem_reservation: 64m
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```
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## Troubleshooting
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### Connection Issues
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Check logs for:
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```
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✅ WebSocket connection established and authenticated
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✅ Successfully joined room
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Native WebSocket client connected and ready
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```
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### Room ID Format
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Ensure the extracted room ID includes @:
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```
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Extracted room ID: @hyperspaceout ← Correct
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Extracted room ID: hyperspaceout ← Wrong!
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```
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### Message Not Appearing
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1. Verify `joinRoom` mutation succeeded
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2. Check subscription is active
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3. Confirm room ID format is correct (with @)
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## Performance Comparison
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| Metric | Playwright | Native WebSocket | Improvement |
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|--------|-----------|------------------|-------------|
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| Docker Image | 1.5 GB | 150 MB | 90% smaller |
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| Memory Usage | ~600 MB | ~30 MB | 95% less |
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| Startup Time | ~15 sec | ~2 sec | 87% faster |
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| CPU Usage | High | Minimal | ~80% less |
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## Future Enhancements
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Potential improvements:
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- [ ] Reconnection logic with exponential backoff
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- [ ] Persistent token storage (avoid re-auth on reconnect)
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- [ ] Support for authenticated users (not just anonymous)
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- [ ] Typing indicators
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- [ ] Read receipts
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## Credits
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This implementation was developed through:
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1. Reverse engineering Kosmi's WebSocket protocol
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2. Browser WebSocket traffic monitoring with Playwright
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3. GraphQL schema introspection
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4. Iterative testing and refinement
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Special thanks to the Kosmi team for using a standard GraphQL WebSocket protocol!
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