Gorilla WebSocket与golang.org/x/net/websocket的比较

根据 Gorilla Websockets项目,无法使用 golang.org/x/net/websocket </ strong>发送ping和pong。 同时,以下内容在 golang.org/x/net/的项目页面上 websocket :</ p>


软件包websocket为RFC 6455中指定的WebSocket协议实现了客户端和服务器。</ p>
</ blockquote> \ n

我有点困惑。 golang.org/x/net/websocket </ strong>实现RFC 6455,但是尽管在 RFC 6455-部分控制框架 </ p>

所以,如果我使用 golang.org / x / net / websocket </ strong>软件包。 超时后连接会中止吗? 换句话说,在这里如何确保连接不会中断。</ p>
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原文

According Gorilla Websockets Project it is not possible to send pings and pongs using golang.org/x/net/websocket. At the same time, the following is on the project page of golang.org/x/net/websocket:

Package websocket implements a client and server for the WebSocket protocol as specified in RFC 6455.

I am a little confused. golang.org/x/net/websocket implements RFC 6455 but can not send control frames (cancel, ping, pong) although this is specified in RFC 6455 - Section Control Frames

So what will happen if I use golang.org/x/net/websocket package. Will the connection abort after a timeout? In other words, how is it ensured here that the connection does not break off.

1个回答




根据大猩猩Websockets项目,无法使用golang.org/x/net/websocket发送ping和pong </ p>
</ blockquote>

Gorilla自述文件有所不同。 它说golang.org/x/net软件包不能发送ping </ em>或接收pong </ em>。 并不是说该软件包不会发送Pong。</ p>

golang.org/x/net软件包会通过将Pong发送给对等方来自动响应从对等方收到的ping, 和大猩猩包一样。 这两个软件包都可以与使用ping和pongs的对等方正常工作,以保持连接状态。</ p>

使用golang.org/x/net/websocket软件包的应用程序不能使用pings和pongs 使连接保持活动状态。 无法发送ping。 无法检测到已收到乒乓球。</ p>
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原文

According Gorilla Websockets Project it is not possible to send pings and pongs using golang.org/x/net/websocket

The Gorilla README says something different. It says that the golang.org/x/net package cannot send a ping or receive a pong. It does not say that the package will not send a pong.

The golang.org/x/net package automatically responds to a ping received from the peer by sending a pong to the peer, as does the Gorilla package. Both packages work correctly with a peer that's using ping and pongs to keep the connection alive.

An application that uses the golang.org/x/net/websocket package cannot employ pings and pongs to keep the connection alive. There's no way to send the ping. There's no way to detect that the pong was received.

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<div class="post-text" itemprop="text"> <p>I'm using Go (Golang) 1.4.2 with Gorilla WebSockets behind an nginx 1.4.6 reverse proxy. My WebSockets are disconnecting after about a minute of having the page open. Same behavior occurs on Chrome and Firefox.</p> <p>At first, I had problems connecting the server and client with WebSockets. Then, I read that I needed to tweak my nginx configuration. This is what I have.</p> <pre><code>server { listen 80; server_name example.com; proxy_pass_header Server; location / { proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forward-Proto $scheme; proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; proxy_pass http://127.0.0.1:1234; } } </code></pre> <p>My Go code is basically echoing back the client's message. (Errors omitted for brevity). This is my <code>HandleFunc</code>.</p> <pre><code>var up = websocket.Upgrader{ ReadBufferSize: 1024, WriteBufferSize: 1024, } ws, _ := up.Upgrade(resp, req, nil) defer ws.Close() var s struct { Foo string Bar string } for { ws.ReadJSON(&amp;s) ws.WriteJSON(s) } </code></pre> <p>The JavaScript is pretty simple as well.</p> <pre><code>var ws = new WebSocket("ws://example.com/ws/"); ws.addEventListener("message", function(evnt) { console.log(JSON.parse(evnt.data)); }); var s = { Foo: "hello", Bar: "world" }; ws.send(JSON.stringify(s)); </code></pre> <p>Go is reporting <code>websocket: close 1006 unexpected EOF</code>. I know that when I leave or refresh the page <code>ReadJSON</code> returns <code>EOF</code>, but this appears to be a different error. Also, the unexpected EOF happens by itself after about a minute of having the page open.</p> <p>I have an <code>onerror</code> function in JavaScript. That event doesn't fire, but <code>onclose</code> fires instead.</p> </div>

Golang WebSocket客户端,获取结果后关闭连接

<div class="post-text" itemprop="text"> <p>How I can implement this kind of scenario:</p> <p>1.I have LoginHandler which receives some user data - email and signedXml:</p> <pre><code>func LoginHandler(c *gin.Context) { var ( err error data LoginPost ) if err = c.BindJSON(&amp;data); err != nil { c.JSON(http.StatusBadRequest, gin.H{"status": "error"}) return } ... c.JSON(http.StatusOK, gin.H{"status": "ok"}) } </code></pre> <p>2.I need to send signedXml to another server via websocket</p> <p>3.Save result (success or error)</p> <p>4.Close connection</p> <p>Every HTTP request will open connection, send 1 message, get 1 result and finally close socket. I was trying with channel, but no success. Is this possible to implement my case?</p> <p><strong>UPDATE</strong></p> <pre><code>package main import ( "log" "net/url" "github.com/gorilla/mux" "github.com/gorilla/websocket" "net/http" ) func indexHandler(w http.ResponseWriter, r *http.Request) { message := r.FormValue("message") w.Write([]byte(message)) } func postHandler(w http.ResponseWriter, r *http.Request) { var ( message = r.FormValue("message") u = url.URL{Scheme: "ws", Host: "echo.websocket.org", Path: "/"} err error out []byte conn *websocket.Conn ) log.Printf("message: %s ", message) log.Printf("connecting to %s ", u.String()) conn, _, err = websocket.DefaultDialer.Dial(u.String(), nil) if err != nil { log.Fatal("dial:", err) } log.Println("write") if err = conn.WriteMessage(websocket.TextMessage, []byte(message)); err != nil { log.Fatal("write:", err) } log.Println("read") if _, out, err = conn.ReadMessage(); err != nil { log.Fatal("read:", err) } w.Write(out) log.Println("close") conn.Close() } func main() { r := mux.NewRouter() r.HandleFunc("/", indexHandler).Methods("GET") r.HandleFunc("/post", postHandler).Methods("POST") http.Handle("/", r) http.ListenAndServe(":8080", nil) } </code></pre> </div>

发送后如何保持Websocket连接处于OPEN就绪状态?

<div class="post-text" itemprop="text"> <p>I am new to websockets. </p> <p>In my setup I have a trivial websocket server written in Go (<a href="https://play.golang.org/p/H6ctw_tFlx" rel="nofollow noreferrer">playground</a>)</p> <p>I make a <code>WebSocket</code> object, set up its <code>onmessage</code> callback and call its <code>send</code> method to test.</p> <pre><code>var w = new WebSocket("ws://localhost:12345/echo") w.onmessage = (msg) =&gt; { console.log(msg.data) } w.onopen = () =&gt; { w.send("Hello") // this fires OK } </code></pre> <p>What I expect to happen based on the server code is to receive the "Hello" message and to keep sending "yahoo" every 1.5s to the client. What actually happens is "Hello" is sent, but none of the "yahoo"'s make it thru. It seems somewhere along the WebSocket.readystate becomes 3 (CLOSED). </p> <p>To clarify, the server receives and prints "Hello" then actually fires a "yahoo" message every 1.5s, but the connection is closed by then so the <code>onmessage</code> callback never fires.</p> <p>Am I missing or misunderstanding anything? </p> <p>EDIT: Ran across <a href="https://github.com/gorilla/websocket#gorilla-websocket-compared-with-other-packages" rel="nofollow noreferrer">comparison github.com/gorilla vs. golang.org/x/net</a>, claims golang.org/x/net websocket implementation does not support pong. This may be the confirmation of it.</p> <p>EDIT: Package golang.org/x/net/websocket closes the websocket connection when the handler ServeHTTP function returns. By default a websocket connection is tied to an instance of the handler.</p> </div>

Docker GO build返回非零代码:1

<div class="post-text" itemprop="text"> <p>Docker command to build</p> <p><code>sudo docker build -t gpst .</code></p> <pre> ubuntu@ip-172-31-9-252:~/goyo/GO/goyo.in/gpstracker$ sudo docker build -t gpst . Sending build context to Docker daemon 1.819MB Step 1/10 : FROM golang:1.8 ---&gt; a8ef0d2260ca Step 2/10 : RUN mkdir -p /go/src/goyo.in/gpstracker ---&gt; Using cache ---&gt; 70f242e31c63 Step 3/10 : WORKDIR /go/src/goyo.in/gpstracker ---&gt; Using cache ---&gt; a1609e2d1463 Step 4/10 : COPY . /go/src/goyo.in/gpstracker ---&gt; 2c90614f0f5b Step 5/10 : RUN go get github.com/codegangsta/gin ---&gt; Running in aae1a6e5d8bc ---&gt; e808aee68694 Removing intermediate container aae1a6e5d8bc Step 6/10 : RUN go-wrapper download # "go get -d -v ./..." ---&gt; Running in 427b2c574de7 + exec go get -v -d github.com/go-playground/log (download) github.com/go-playground/errors (download) github.com/tidwall/tile38 (download) package github.com/tidwall/tile38/client: cannot find package "github.com/tidwall/tile38/client" in any of: /usr/local/go/src/github.com/tidwall/tile38/client (from $GOROOT) /go/src/github.com/tidwall/tile38/client (from $GOPATH) github.com/garyburd/redigo (download) github.com/googollee/go-socket.io (download) github.com/googollee/go-engine.io (download) github.com/gorilla/websocket (download) github.com/rs/cors (download) github.com/jasonlvhit/gocron (download) github.com/NaySoftware/go-fcm (download) Fetching https://golang.org/x/net/context?go-get=1 Parsing meta tags from https://golang.org/x/net/context?go-get=1 (status code 200) get "golang.org/x/net/context": found meta tag main.metaImport{Prefix:"golang.org/x/net", VCS:"git", RepoRoot:"https://go.googlesource.com/net"} at https://golang.org/x/net/context?go-get=1 get "golang.org/x/net/context": verifying non-authoritative meta tag Fetching https://golang.org/x/net?go-get=1 Parsing meta tags from https://golang.org/x/net?go-get=1 (status code 200) golang.org/x/net (download) Fetching https://google.golang.org/grpc?go-get=1 Parsing meta tags from https://google.golang.org/grpc?go-get=1 (status code 200) get "google.golang.org/grpc": found meta tag main.metaImport{Prefix:"google.golang.org/grpc", VCS:"git", RepoRoot:"https://github.com/grpc/grpc-go"} at https://google.golang.org/grpc?go-get=1 google.golang.org/grpc (download) Fetching https://golang.org/x/text/secure/bidirule?go-get=1 Parsing meta tags from https://golang.org/x/text/secure/bidirule?go-get=1 (status code 200) get "golang.org/x/text/secure/bidirule": found meta tag main.metaImport{Prefix:"golang.org/x/text", VCS:"git", RepoRoot:"https://go.googlesource.com/text"} at https://golang.org/x/text/secure/bidirule?go-get=1 get "golang.org/x/text/secure/bidirule": verifying non-authoritative meta tag Fetching https://golang.org/x/text?go-get=1 Parsing meta tags from https://golang.org/x/text?go-get=1 (status code 200) golang.org/x/text (download) Fetching https://golang.org/x/text/unicode/bidi?go-get=1 Parsing meta tags from https://golang.org/x/text/unicode/bidi?go-get=1 (status code 200) get "golang.org/x/text/unicode/bidi": found meta tag main.metaImport{Prefix:"golang.org/x/text", VCS:"git", RepoRoot:"https://go.googlesource.com/text"} at https://golang.org/x/text/unicode/bidi?go-get=1 get "golang.org/x/text/unicode/bidi": verifying non-authoritative meta tag Fetching https://golang.org/x/text/unicode/norm?go-get=1 Parsing meta tags from https://golang.org/x/text/unicode/norm?go-get=1 (status code 200) get "golang.org/x/text/unicode/norm": found meta tag main.metaImport{Prefix:"golang.org/x/text", VCS:"git", RepoRoot:"https://go.googlesource.com/text"} at https://golang.org/x/text/unicode/norm?go-get=1 get "golang.org/x/text/unicode/norm": verifying non-authoritative meta tag github.com/golang/protobuf (download) Fetching https://google.golang.org/genproto/googleapis/rpc/status?go-get=1 Parsing meta tags from https://google.golang.org/genproto/googleapis/rpc/status?go-get=1 (status code 200) get "google.golang.org/genproto/googleapis/rpc/status": found meta tag main.metaImport{Prefix:"google.golang.org/genproto", VCS:"git", RepoRoot:"https://github.com/google/go-genproto"} at https://google.golang.org/genproto/googleapis/rpc/status?go-get=1 get "google.golang.org/genproto/googleapis/rpc/status": verifying non-authoritative meta tag Fetching https://google.golang.org/genproto?go-get=1 Parsing meta tags from https://google.golang.org/genproto?go-get=1 (status code 200) google.golang.org/genproto (download) The command '/bin/sh -c go-wrapper download # "go get -d -v ./..."' returned a non-zero code: 1 </pre> </div>

Gorilla Websocket没有收到消息

<div class="post-text" itemprop="text"> <p>I am building a gateway in Golang that communicates with Gorilla websockets.</p> <p>I am running it on Ubuntu 16.04, and testing it currently with a .NET console app.</p> <p>Using Wireshark on Windows and sniffit on Ubuntu have determined that <em>messages are being sent correctly from the Windows client and received by the Ubuntu box</em>.</p> <p>In my code, however, sometimes after a few successful messages, and sometimes after none, my gateway is failing to read the message (still sitting at <code>_, msg, errCon := conn.ReadMessage()</code>)</p> <p>An example of the output will be:</p> <blockquote> <p>2018/03/27 02:38:06 Awaiting Message ... 2018/03/27 02:38:07 Message received: main.AdminRequest{Data:"{\"SomeDataHeader\":\"SomeData\"}", Requestor:"user", Type:"JustDoSomethingRequest", Ukey:"talca"} 2018/03/27 02:38:07 {"SomeDataHeader":"SomeData"} 2018/03/27 02:38:07 Awaiting Message ...</p> </blockquote> <p>As I have previously said, it may receive a few messages like this, but, despite network traffic on both ends continuing, no more messages will be received</p> <p>I am fairly new with Golang, and working under the assumption that I am missing something.</p> <p><strike>I have trimmed out error handling and the like for the sake of brevity in the code below, but this is an example of the failing code.</strike></p> <p><strong>EDIT</strong> As requested I have added Golang full code, and C# client code below (although, as I stated, Wireshark and sniffit have determined that data is going over the wire)</p> <pre><code>package main import ( "fmt" "net/http" "github.com/gorilla/websocket" "encoding/json" "log" ) var upgrader = websocket.Upgrader{ ReadBufferSize: 1024, WriteBufferSize: 1024, CheckOrigin: func(r *http.Request) bool { return true }, } type AdminRequest struct { Data string `json:"Data"` Requestor string `json:"Requestor"` Type string `json:"Type"` Ukey string `json:"Ukey"` } func main() { http.HandleFunc("/a", func(w http.ResponseWriter, r *http.Request) { var conn, _ = upgrader.Upgrade(w, r, nil) go func(conn *websocket.Conn) { for { _, _, err := conn.ReadMessage() if err != nil { log.Println("Close: "+ err.Error()) conn.Close() return } } }(conn) go func(conn *websocket.Conn) { for { log.Println("Awaiting Message ...") _, msg, errCon := conn.ReadMessage() if errCon != nil { log.Println("Read Error:", errCon) break } log.Println("Message received: ") var r AdminRequest if err := json.Unmarshal(msg, &amp;r); err != nil { log.Println("Error: " + err.Error()); return; } fmt.Printf("%#v ", r) log.Println(r.Data); } }(conn) }) http.ListenAndServe(":3000", nil) } </code></pre> <p>C# Code:</p> <pre><code>public class Client : IDisposable { private ClientWebSocket _socket; string _address; int _port; public Client(string address) { _address = address; _socket = new ClientWebSocket(); } public async void SetupForReceivingStuffs() { while (_socket.State == WebSocketState.Open) { ArraySegment&lt;byte&gt; receivedBytes = new ArraySegment&lt;byte&gt;(new byte[1024]); WebSocketReceiveResult result = await _socket.ReceiveAsync(receivedBytes, CancellationToken.None); Console.WriteLine(Encoding.UTF8.GetString(receivedBytes.Array, 0, result.Count)); } } public async void SetupForSendingStuffs(ConcurrentQueue&lt;AdminRequest&gt; queue) { while (_socket.State == WebSocketState.Open) { AdminRequest next; while (queue.Count &gt; 0) { if (queue.TryDequeue(out next)) { await Send(next); } } await Task.Yield(); } } public async Task Connect() { while (_socket.State != WebSocketState.Open) { try { _socket = new ClientWebSocket(); await _socket.ConnectAsync(new Uri(_address), CancellationToken.None); Console.WriteLine("Socket state: " + _socket.State); } catch (Exception ex) { //Not getting hit Console.WriteLine(ex.Message); Console.WriteLine(ex.StackTrace); } } } public Task Send&lt;TData&gt;(TData data) { string text = JsonConvert.SerializeObject(data); var encoded = Encoding.UTF8.GetBytes(text); var buffer = new ArraySegment&lt;Byte&gt;(encoded, 0, encoded.Length); return _socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None); } public void Dispose() { _socket.Dispose(); } } </code></pre> <p>Called by:</p> <pre><code>class Program { static ConcurrentQueue&lt;AdminRequest&gt; _toSend; static void Main(string[] args) { _toSend = new ConcurrentQueue&lt;AdminRequest&gt;(); Client client = new Client("ws:/(myip):(myport)/a"); client.Connect().Wait(); //client.SetupForReceivingStuffs(); client.SetupForSendingStuffs(_toSend); WriteInstructions(); LoopAuto(); Console.WriteLine("Bye"); } private static void LoopAuto() { DateTime nextMessage = DateTime.Now; while (true) { if (DateTime.Now &lt; nextMessage) continue; Console.WriteLine("Next"); nextMessage = DateTime.Now.AddSeconds(2); _toSend.Enqueue(new AdminRequest { Data = "{\"SomeDataHeader\":\"SomeData\"}", Requestor = "user", Type = "JustDoSomethingRequest", Ukey = "talca" }); } } private static ConsoleKeyInfo LoopManual() { ConsoleKeyInfo info; do { info = Console.ReadKey(true); if (info.KeyChar == '1') { _toSend.Enqueue(new AdminRequest { Data = "{\"SomeDataHeader\":\"SomeData\"}", Requestor = "user", Type = "JustDoSomethingRequest", Ukey = "talca" }); } else if (info.KeyChar == 'i') { WriteInstructions(); } } while (info.KeyChar != 'x'); return info; } private static void WriteInstructions() { Console.WriteLine("1. Send New Message"); Console.WriteLine("i. Instructions (these lines)"); Console.WriteLine("x: Exit"); } } </code></pre> </div>

如何从golang的websocket服务器向客户端主动发送消息

<div class="post-text" itemprop="text"> <p>I'm a newcomer for the golang and websocket.</p> <p>I'm trying to write a websocket server which can send the messages actively to client once the handshake is done.</p> <p>but my server will just only send the message to the client when got the request from the client.</p> <p>Does anyone know how to implement this feature or where can I find the related answer for that? </p> <p>Thank you so much.</p> <p>the source code is as follows:</p> <pre><code>package main import ( "log" "net/http" ) func handler(w http.ResponseWriter, req *http.Request) { w.Header().Set("Content-Type", "text/plain") w.Write([]byte("Hi, the handshake is completed. ")) w.Write([]byte("Let's start to talk something. ")) } func main() { http.HandleFunc("/", handler) log.Printf("Start to listen on 443.") err := http.ListenAndServeTLS(":443", "server.crt", "server.key", nil) log.Fatal(err) } </code></pre> </div>

go安装iris失败, package github.com/kataras/iris: exit status 128

今天想安装个iris框架,执行命令行:go get -u -v github.com/kataras/iris 后就卡住了, 过了好久命令行提示如下: ``` PS C:\Users\dewff> go get -u github.com\kataras\iris # cd .; git clone https://github.com/kataras/iris D:\go_workspace\src\github.com\kataras\iris Cloning into 'D:\go_workspace\src\github.com\kataras\iris'... fatal: early EOF fatal: The remote end hung up unexpectedly fatal: index-pack failed error: RPC failed; curl 18 transfer closed with outstanding read data remaining package github.com/kataras/iris: exit status 128 ``` 我的git环境变量也配了,再任意目录下都可执行git --version 求大神告知啥原因????

导入github.com/influxdb/influxdb/client/v2包时缺少符号

<div class="post-text" itemprop="text"> <p>Setting up a web socket on google cloud in Golang, and import code that works fine on my local machine does not work on the cloud. </p> <p>I have:</p> <pre><code>import "github.com/influxdb/influxdb/client/v2" </code></pre> <p>and have run </p> <pre><code>go get "github.com/influxdb/influxdb/client/v2" </code></pre> <p>Upon running go run server.go I get:</p> <pre><code># command-line-arguments ./pi_server.go:47: undefined: client.NewClient ./pi_server.go:47: undefined: client.Config </code></pre> <p>Full code below, excluding const declarations and html:</p> <pre><code>package main import ( "flag" "html/template" "log" "net/http" "github.com/gorilla/websocket" "fmt" "net/url" "github.com/influxdb/influxdb/client/v2" "time" ) var addr = flag.String("addr", "localhost:8080", "http service address") var upgrader = websocket.Upgrader{} // use default options func echo(w http.ResponseWriter, r *http.Request) { //Influx init u,err := url.Parse("http://localhost:8086") checkError(err) influx_c := client.NewClient(client.Config{ URL: u, Username: username, Password: password, }) bp,err := client.NewBatchPoints(client.BatchPointsConfig{ Database: MyDB, Precision: "s", }) tags := map[string]string{"my_sensor_id": my_sensor_id} //end influx init c, err := upgrader.Upgrade(w, r, nil) if err != nil { log.Print("upgrade:", err) return } defer c.Close() for { mt, message, err := c.ReadMessage() if err != nil { log.Println("read:", err) break } log.Printf("recv: %s", message) /* write to influx here */ fields := map[string]interface{}{ "random_int": message, "other_stuff": 69696, } pt,err := client.NewPoint("test_collection", tags, fields, time.Now()) checkError(err) bp.AddPoint(pt) influx_c.Write(bp) err = c.WriteMessage(mt, message) if err != nil { log.Println("write:", err) break } } } func home(w http.ResponseWriter, r *http.Request) { homeTemplate.Execute(w, "ws://"+r.Host+"/echo", ) } func main() { flag.Parse() log.SetFlags(0) http.HandleFunc("/echo", echo) http.HandleFunc("/", home) log.Fatal(http.ListenAndServe(*addr, nil)) } </code></pre> </div>

转到Gorilla Websocket〜在ping / pong上失败(用户断开连接)调用功能吗?

<div class="post-text" itemprop="text"> <p>I'm writing a chat program with Golang and Gorilla's Websocket toolkit.</p> <p>I'm wondering if there is a way to run a function whenever a user disconnects or a ping/pong message fails. I need this to remove them from variables and such. Is there any easy way to do this?</p> </div>

使用Golang扩展WebSocket连接

<div class="post-text" itemprop="text"> <pre><code> func handleConn(w http.ResponseWriter, r *http.Request) { ws, err := upgrader.Upgrade(w, r, nil) if err != nil { if _, ok := err.(websocket.HandshakeError); !ok { log.Println(err) } return } go writer(ws) reader(r, ws) } func main() { http.HandleFunc("/", handleConn) } </code></pre> <p>I am trying to build a high scaling websocket server using golang. Since there is lack of support in native go websocket package, i am using <a href="https://github.com/gorilla/websocket" rel="nofollow noreferrer">https://github.com/gorilla/websocket</a>. </p> <p>For every connection, a goroutine will be spawned to take care of writes to it. For scaling huge number of connections. Let's say if I have 1M concurrent connections then there should be 1M goroutines will be running on the server.</p> <p><strong>Hardware Specification:</strong></p> <p>16 GB Ram</p> <p>4 Core CPU</p> <p>2.5 GHz Intel Core i5</p> <p>will it work for large number of connections without affecting the performance?</p> </div>

如何使用Golang Gorilla / mux托管并发Websocket连接?

<div class="post-text" itemprop="text"> <p>thanks in advance for any help or advice! </p> <p>I am building a chess application, the frontend is in Reactjs and backend is a server written in Golang using Gorilla mux library. The backend is a chess engine for the human user to play against. The react frontend creates a WebSocket connection with the server in the top-level constructor. </p> <p>The app works well for a single connection. However, upon opening a second browser tab, the first browser tab's Websocket connection is lost. </p> <p>The server reports the error, </p> <pre><code>read error: websocket: close 1001 (going away) </code></pre> <p>and then,</p> <pre><code>read error: read tcp 127.0.0.1:8081-\u003e127.0.0.1:64146: use of closed network connection </code></pre> <p>I've looked at the Gorrilla/mux documentation for websockets and am reading/writing all from the same function in order to avoid concurrent reads or writes on the same connection. </p> <p>React frontend constructor is here: </p> <pre><code>class Game extends React.Component { constructor(props) { super(props); this.state = { history: [{ position: this.props.chess.fen(), move: "", }], ply: 0, selectedSq: null, engineName: "", engineAuthor: "", uciOK: false, isReady: false, engineThinking: false, playersTurn: true, playerColor: WHITE, }; this.ws = websocketConnect("ws://localhost:8081/uci"); this.ws.onmessage = (event) =&gt; { const msg = event.data this.processEngineMessage(msg) } } </code></pre> <p>It is referencing websocket.js which is here: </p> <pre><code>export function websocketConnect(url) { const ws = new WebSocket(url); ws.addEventListener('open', (event) =&gt; { ws.send('uci'); }); return ws; } </code></pre> <p>Goland Websocket package is here</p> <pre><code>package websocket import ( "net/http" "github.com/namsral/flag" log "github.com/sirupsen/logrus" "github.com/gorilla/websocket" ) type WebsocketServer struct { upgrader websocket.Upgrader addr *string conn *websocket.Conn } func NewWebsocketServer() *WebsocketServer { w := new(WebsocketServer) w.addr = flag.String("addr", "localhost:8081", "http service address") flag.Parse() w.upgrader = websocket.Upgrader{} // use default options http.HandleFunc("/uci", w.uciHandler) return w } func (w *WebsocketServer) uciHandler(rw http.ResponseWriter, r *http.Request) { var err error log.Error("upgrading to websocket connection") w.upgrader.CheckOrigin = func(r *http.Request) bool { return true } w.conn, err = w.upgrader.Upgrade(rw, r, nil) if err != nil { log.Print("upgrade:", err) return } go w.UCI(rw, r) } func (w *WebsocketServer) Start() { log.Info("starting websocket server") http.ListenAndServe(*w.addr, nil) } func (w *WebsocketServer) CloseConnection() { w.conn.Close() } func (w *WebsocketServer) StartReader(channel chan string) { for { _, message, err := w.conn.ReadMessage() if err != nil { log.Println("read error:", err) break } log.Printf("recv: %s", message) channel &lt;- string(message) } } func (w *WebsocketServer) Write(msg string) { err := w.conn.WriteMessage(websocket.TextMessage, []byte(msg)) if err != nil { log.Println("write:", err) } } </code></pre> <p>Full code here: server: <a href="https://github.com/tonyOreglia/glee" rel="nofollow noreferrer">https://github.com/tonyOreglia/glee</a> frontend: <a href="https://github.com/tonyOreglia/chess-board-react" rel="nofollow noreferrer">https://github.com/tonyOreglia/chess-board-react</a></p> <p>I am hoping to be able to support multiple concurrent users using the website. It is currently hosted on DigitalOcean.</p> </div>

MySQL 8.0.19安装教程(windows 64位)

话不多说直接开干 目录 1-先去官网下载点击的MySQL的下载​ 2-配置初始化的my.ini文件的文件 3-初始化MySQL 4-安装MySQL服务 + 启动MySQL 服务 5-连接MySQL + 修改密码 先去官网下载点击的MySQL的下载 下载完成后解压 解压完是这个样子 配置初始化的my.ini文件的文件 ...

Python+OpenCV计算机视觉

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