Go SSE Demo


package main
 
import (
	"fmt"
	"github.com/r3labs/sse/v2"
	"gopkg.in/antage/eventsource.v1"
	"log"
	"net/http"
	"sync"
	"time"
)
 
func testServer() {
	es := eventsource.New(nil, nil)
	defer es.Close()
 
	http.Handle("/", http.FileServer(http.Dir("./")))
	http.Handle("/events", es)
	go func() {
 
		for {
			// 每2秒发送一条当前时间消息，并打印对应客户端数量
			es.SendEventMessage(fmt.Sprintf("hello, now is: %s", time.Now()), "", "")
			log.Printf("Hello has been sent (consumers: %d)", es.ConsumersCount())
			time.Sleep(2 * time.Second)
		}
		//log.Printf("ES Server Close")
		//es.Close()
	}()
 
	log.Println("Open URL http://127.0.0.1:9990/1.html in your browser.")
	err := http.ListenAndServe(":9990", nil)
	if err != nil {
		log.Fatal(err)
	}
}
 
func testClient() {
	client := sse.NewClient("http://127.0.0.1:9990/events")
 
	//proxyUrl, _ := url.Parse("http://127.0.0.1:9934")
	//client.Connection.Transport = &http.Transport{
	//	TLSClientConfig: &tls.Config{
	//		InsecureSkipVerify: true,
	//	},
	//	Proxy: http.ProxyURL(proxyUrl),
	//}
	fmt.Println("开始订阅")
	client.Subscribe("messages", func(msg *sse.Event) {
		// Got some data!
		v := string(msg.Data)
		fmt.Println("收到消息:" + v)
	})
}
 
func main() {
	wg := sync.WaitGroup{}
	wg.Add(1)
 
	go testServer()
	go testClient()
 
	wg.Wait()
}

html端 1.html


<!DOCTYPE html>
<html>
<head>
    <title>SSE test</title>
    <script type="text/javascript">
        window.addEventListener("DOMContentLoaded", function () {            
            var evsrc = new EventSource("http://127.0.0.1:9990/events");
            var msgEvent = function (ev) {                
                document.getElementById("log")
                    .insertAdjacentHTML("beforeend", "
" + ev.data + "
");

}
evsrc.onmessage = msgEvent;
//evsrc.addEventListener("message", msgEvent)
evsrc.onerror = function (ev) {
console.log("readyState = " + ev.currentTarget.readyState);
}
})
</script>
</head>
<body>
<h1>SSE test</h1>
<div>
<ul id="log">
</ul>
</div>
</body>
</html>

网页端效果