main.go

package main

import (
	"bufio"
	"flag"
	"fmt"
 	"log"
 	"math/rand"
 	"os"
 	"time"
 	"golang.org/x/net/websocket"
)

type Message struct {
	Text string `json:"text"`
}

var (
 	port = flag.String("port", "9123", "port used for ws connection")
)

func connect() (*websocket.Conn, error) {
	return websocket.Dial(fmt.Sprintf("ws://localhost:%s", *port), "", mockedIP())
}

func mockedIP() string {
	var arr [4]int
 	for i := 0; i < 4; i++ {
   		rand.Seed(time.Now().UnixNano())
   		arr[i] = rand.Intn(256)
 	}
 	
 	return fmt.Sprintf("http://%d.%d.%d.%d", arr[0], arr[1], arr[2], arr[3])
}


func main() {
	flag.Parse()
	// connect
 	ws, err := connect()
 	if err != nil {
   		log.Fatal(err)
 	}
 	defer ws.Close()
	// receive
 	
 	var m Message
 	
 	go func() {
  	
  		for {
    		err := websocket.JSON.Receive(ws, &m)
    		if err != nil {
      			fmt.Println("Error receiving message: ", err.Error())
      			break
    		}
    		fmt.Println("Message: ", m)
  		}
 	}()

	// send
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
   		text := scanner.Text()
   		if text == "" {
     		continue
   		}
   		m := Message{
     		Text: text,
   		}
   		err = websocket.JSON.Send(ws, m)
   		if err != nil {
     		fmt.Println("Error sending message: ", err.Error())
     		break
   		}
 	}	
}