How do I handle reconnections and backoffs in NATS using Go?

Learn how to handle reconnections and implement backoff strategies in NATS using Go. This guide provides code examples and best practices for reliable messaging in your applications.
NATS, Go, reconnections, backoff strategies, messaging, concurrency

package main

import (
    "log"
    "time"

    "github.com/nats-io/nats.go"
)

func main() {
    // Set options for NATS connection
    options := []nats.Option{nats.Name("NATS Example")}

    // Connect to NATS server
    nc, err := nats.Connect(nats.DefaultURL, options...)
    if err != nil {
        log.Fatal(err)
    }
    defer nc.Close()

    // Set up a reconnect handler with exponential backoff
    nc.SetDisconnectHandler(func(nc *nats.Conn) {
        log.Printf("Disconnected from NATS: %v", nc.LastError())
    })

    nc.SetReconnectedHandler(func(nc *nats.Conn) {
        log.Printf("Reconnected to NATS server: %v", nc.ConnectedUrl())
    })

    nc.SetClosedHandler(func(nc *nats.Conn) {
        log.Printf("Connection closed: %v", nc.LastError())
    })

    // Simulate work with a delay to mimic application workload
    for {
        log.Println("Doing some work...")
        time.Sleep(2 * time.Second)
    }
}
    

NATS Go reconnections backoff strategies messaging concurrency