How to implement a WebSocket client for real-time communication in Go?

To implement a WebSocket client for real-time communication in Go, you can follow the steps below:

Import the necessary packages:

import (
	"log"
	"net/url"
	"os"
	"os/signal"

	"github.com/gorilla/websocket"
)

Create a websocket.Dialer instance:

var upgrader = websocket.Upgrader{}

func main() {
	interrupt := make(chan os.Signal, 1)
	signal.Notify(interrupt, os.Interrupt)

	u := url.URL{Scheme: "ws", Host: "localhost:8080", Path: "/ws"}
	log.Println("Connecting to", u.String())

	c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
	if err != nil {
		log.Fatal("dial:", err)
	}
	defer c.Close()

Implement a separate goroutine to read messages from the WebSocket connection:

	go func() {
		defer c.Close()
		for {
			_, message, err := c.ReadMessage()
			if err != nil {
				log.Println("read:", err)
				return
			}
			log.Printf("received: %s\n", message)
		}
	}()

Implement a goroutine to send messages to the WebSocket connection:

	for {
		select {
		case <-interrupt:
			log.Println("interrupt")

			err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
			if err != nil {
				log.Println("write close:", err)
				return
			}
			select {
			case <-done:
			case <-time.After(time.Second):
			}
			return
		}
	}

Finally, in the main() function, handle any errors and run an infinite loop to keep the client running:

	func main() {
		// ... previous code ...

		for {
			// ... previous code ...

			err = c.WriteMessage(websocket.TextMessage, []byte("Hello, server!"))
			if err != nil {
				log.Println("write:", err)
				return
			}

			// ... previous code ...
		}
	}

Make sure to replace the localhost:8080 in the u variable with the actual WebSocket server's address. Additionally, handle any errors appropriately based on your use case.

That's it! You now have a basic WebSocket client implemented in Go.