Go websocket EOF bug

清疚 2022-11-05 00:48 168阅读 0赞

## 背景 ##

使用的 `golang.org/x/net/websocket` 包，前端一发来消息就报错

if err = websocket.Message.Receive(ws, &msg); err != nil { 
    	vlog.Error("接收消息错误：", err)
    	return
    }

报错：

接收消息错误： EOF

## 排查 ##

先排除了下网络问题，发现是OK的。

反复看了下代码,感觉没啥问题啊，于是搜了个demo。  
https://www.cnblogs.com/lanyangsh/p/9190296.html

改了下：

package main
    
    import (  
        "fmt"   
        "golang.org/x/net/websocket" 
        "log"  
        "net/http"  
    )
    func Echo(ws *websocket.Conn) {   
        var err error  
        for {   
            var reply string  
            //websocket接受信息 
            if err = websocket.Message.Receive(ws, &reply); err != nil {   
                fmt.Println("receive failed:", err)  
                break  
            }
            fmt.Println("reveived from client: " + reply)
            msg := "received:" + reply
            fmt.Println("send to client:" + msg)
            //这里是发送消息
            if err = websocket.Message.Send(ws, msg); err != nil { 
                fmt.Println("send failed:", err)
                break
            }
        }
    }
    
    func main() { 
        //接受websocket的路由地址
        http.Handle("/websocket", websocket.Handler(Echo))
        if err := http.ListenAndServe(":1234", nil); err != nil { 
            log.Fatal("ListenAndServe:", err)
        }
    }

前端：

<!DOCTYPE html>
     <html>
    <head>
        <meta charset="utf-8"/>
        <title>go测试socket</title>
    </head>
    <body>
        <script type="text/javascript">
            var sock = null;
            var wsuri = "ws://127.0.0.1:8635/turntable";
            window.onload = function() {
                console.log("onload");
                sock = new WebSocket(wsuri);
                sock.onopen = function() {
                    console.log("connected to " + wsuri);
                }
                sock.onclose = function(e) {
                    console.log("connection closed (" + e.code + ")");
                }
                sock.onmessage = function(e) {
                    console.log("message received: " + e.data);
                }
            };
            function send() {
                var msg = document.getElementById('message').value;
                sock.send(msg);
            };
        </script>
        <h1>WebSocket Echo Test</h1>
        <form>
            <p>
                Message: <input id="message" type="text" value="Hello, world!">
            </p>
        </form>
        <button onclick="send();">Send Message</button>
    </body>
    </html>

然后发现自己调用是好的。发给前端，让他本机调用，也是好的。

于是。。。前端发现是自己的定时器时间没写，所以一连就断开了。。。

## 总结 ##

*  先排除基本问题，比如网络、防火墙。
 *  写demo，验证问题在哪里。
 *  EOF是断开就会触发。