Creating your first WebSocket server

In this recipe, we will learn how to write a WebSocket server, which is a TCP application listening on port 8080 that allows connected clients to send messages to each other.

How to do it…

1. Install the github.com/gorilla/websocket package using the go get command, as follows: 

$ go get github.com/gorilla/websocket

2. Create websocket-server.go where we will upgrade an HTTP request to WebSocket, read the JSON message from the client, and broadcast it to all of the connected clients, as follows:

package main 
import 
(
  "log"
  "net/http"
  "github.com/gorilla/websocket"
)
var clients = make(map[*websocket.Conn]bool)
var broadcast = make(chan Message) 
var upgrader = websocket.Upgrader{}
type Message struct 
{
  Message string `json:"message"`
}
func HandleClients(w http.ResponseWriter, r *http.Request) 
{
  go broadcastMessagesToClients()
  websocket, err := upgrader.Upgrade(w, r, nil)
  if err != nil 
  {
    log.Fatal("error upgrading GET request to a 
    websocket...