Hone Relay

WebSocket relay server for Hone cross-device sync. Routes messages between devices in shared rooms with offline buffering and persistent delta storage.

How It Works

Device A ──WebSocket──► Relay ◄──WebSocket── Device B
               │
               ├─ authenticate (token-based)
               ├─ join room
               ├─ route messages (unicast / broadcast / host)
               ├─ buffer for offline devices
               └─ persist deltas (SQLite)

1. Devices connect via WebSocket and authenticate with a signed token
2. Devices join a shared room (identified by room ID)
3. Messages are routed between devices in the same room
4. If a device is offline, messages are buffered and delivered on reconnect
5. Deltas are persisted to SQLite for durable sync state

Building

Requires Bun:

bun install

Running

# With environment variables
HONE_AUTH_SECRET=your-secret-here bun run src/app.ts

# Or with a config file
cp relay.conf.example relay.conf
# Edit relay.conf with your settings
bun run src/app.ts

Configuration

Configuration is read from relay.conf (key=value format), with environment variable overrides taking precedence.

Env Variable	Config Key	Default	Description
HONE_RELAY_HOST	host	0.0.0.0	Bind address
HONE_RELAY_PORT	port	8443	HTTP server port (WS = port + 1)
HONE_AUTH_SECRET	auth.secret	(empty)	Token signing secret
HONE_RELAY_SQLITE_PATH	sqlite.path	./relay.db	SQLite database path
HONE_RELAY_MAX_ROOMS	max.rooms	1000	Maximum concurrent rooms
HONE_RELAY_MAX_CLIENTS_PER_ROOM	max.clients.per.room	10	Max devices per room
HONE_RELAY_BUFFER_TTL	buffer.ttl.seconds	300	Offline message buffer TTL

Docker

docker build -t hone-relay .
docker run -p 8443:8443 -e HONE_AUTH_SECRET=your-secret hone-relay

Testing

bun test

Architecture

• src/app.ts — Server entry point, WebSocket message routing
• src/auth.ts — Token-based device authentication
• src/ws-hub.ts — WebSocket connection management
• src/rooms.ts — Room membership and lifecycle
• src/buffer.ts — Offline message buffering
• src/delta-store.ts — SQLite-backed persistent delta storage
• src/config.ts — Configuration parsing (file + env vars)
• src/rate-limit.ts — Per-IP rate limiting

License

MIT