Resilient WebSocket Client for Go

resilientws is a lightweight and resilient WebSocket client library built in Go, designed for real-time data streaming applications that require automatic reconnection, subscription resumption, and heartbeat management.

Feature

• Connection Management — Establish and maintain a resilient WebSocket connection using the provided configuration (Headers, TLSConfig, Proxy, Logger, PingInterval, PongTimeout, MessageQueueSize).
• Automatic Reconnection — Automatically reconnect to the WebSocket server if the connection is lost, with configurable retry intervals.
• Production Ready Backoff — Intelligent backoff strategy that applies to all reconnection scenarios, including after successful connections that later disconnect, preventing tight reconnection loops.
• Subscribe Handler — Invoke the SubscribeHandler function after each successful connection or reconnection event.
• Message Handler — Handle incoming messages from the WebSocket server.
• Ping/Pong Mechanism — Send ping messages at the configured PingInterval to keep the connection alive, using the PingHandler function.
• Event Handling — Provide callbacks for connection, reconnection, and error events (onConnected, onReconnecting, onError).
• Message Queue — Maintain a queue of messages to be sent when the connection is reestablished after a disconnection.
• Connection Stability Monitoring — Automatically resets backoff counters after connections remain stable for a configurable duration.

Installation

go get github.com/ipanardian/resilientws

Usage

Basic Configuration

ws := &resilientws.Resws{
    RecBackoffMin:            1 * time.Second,     // Minimum backoff duration
    RecBackoffMax:            30 * time.Second,    // Maximum backoff duration  
    RecBackoffFactor:         1.5,                // Backoff multiplier
    BackoffType:              resilientws.BackoffTypeJitter, // Backoff strategy
    MessageHandler: func(msgType int, msg []byte) {
        log.Printf("Received: %s", string(msg))
    },
}

ws.OnConnected(func(url string) {
    log.Printf("Connected to %s", url)
})

ws.OnReconnecting(func(duration time.Duration) {
    log.Printf("Reconnecting in %v", duration)
})

ws.OnError(func(err error) {
    log.Printf("Error: %v", err)
})

ws.Dial("wss://example.com/ws")
defer ws.Close()

Check the example directory for more detailed usage examples.

License

resilientws is licensed under the MIT License.

resilientws inspired by recws