Signaling server

Used for negotiations of WebRTC channel between Connector Extension or headless radix connect and Radix Wallet. Its client is implemented in radix-connect-webrtc inside SignalingClient or in babylon ios wallet example

Architecture

The server uses a distributed architecture where multiple instances can run simultaneously, communicating through Redis pub/sub. This allows for:

• Horizontal scalability
• High availability
• Load balancing
• Session persistence

Message Types Supported

• WebRTC Offers
• WebRTC Answers
• ICE Candidates
• Connection status updates

Negotiation diagram

sequenceDiagram
    participant Client1 as Client 1 (Wallet)
    participant SS as Signaling Server
    participant Redis as Redis PubSub
    participant Client2 as Client 2 (Extension)

    Note over Client1,Client2: Client 1 connects first
    Client1->>SS: WS Connect (connectionId, source=wallet, target=extension)
    SS->>Redis: Set data (connectionId:extension, clientId1)
    SS->>Redis: Subscribe to clientId1 channel
    SS-->>Client1: Connection established

    Note over Client1,Client2: Client 2 connects later
    Client2->>SS: WS Connect (connectionId, source=extension, target=wallet)
    SS->>Redis: Get data (connectionId:wallet)
    SS->>Redis: Set data (connectionId:wallet, clientId2)
    SS->>Redis: Subscribe to clientId2 channel
    
    Note over SS: Found existing client
    SS->>Redis: Publish to clientId1 {"info": "remoteClientJustConnected"}
    SS-->>Client2: {"info": "remoteClientIsAlreadyConnected"}
    Redis-->>Client1: {"info": "remoteClientJustConnected"}

    Note over Client1,Client2: Channel established, ready for WebRTC signaling 

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Development Setup

yarn install

Running Docker Containers

You'll need docker installed on your machine to run this!

Build the image

docker-compose build

Start the dev server and Redis instance

make up

Running Tests

make up-test - run two local Signaling Server instances and redis instance yarn test - execute tests

Additional commands

Build and start dev server

make up-build

Stream logs

make logs

Stop the server

make down

Build and start production build

make up-prod