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How to use Kind method of websocket Package

Best Testkube code snippet using websocket.Kind

socket.go

Source:socket.go

...46	msgDelay = 10 * time.Millisecond47)48// Message is the wire format for the websocket connection to the browser.49// It is used for both sending output messages and receiving commands, as50// distinguished by the Kind field.51type Message struct {52	Id      string // client-provided unique id for the process53	Kind    string // in: "run", "kill" out: "stdout", "stderr", "end"54	Body    string55	Options *Options `json:",omitempty"`56}57// Options specify additional message options.58type Options struct {59	Race bool // use -race flag when building code (for "run" only)60}61// NewHandler returns a websocket server which checks the origin of requests.62func NewHandler(origin *url.URL) websocket.Server {63	return websocket.Server{64		Config:    websocket.Config{Origin: origin},65		Handshake: handshake,66		Handler:   websocket.Handler(socketHandler),67	}68}69// handshake checks the origin of a request during the websocket handshake.70func handshake(c *websocket.Config, req *http.Request) error {71	o, err := websocket.Origin(c, req)72	if err != nil {73		log.Println("bad websocket origin:", err)74		return websocket.ErrBadWebSocketOrigin75	}76	_, port, err := net.SplitHostPort(c.Origin.Host)77	if err != nil {78		log.Println("bad websocket origin:", err)79		return websocket.ErrBadWebSocketOrigin80	}81	ok := c.Origin.Scheme == o.Scheme && (c.Origin.Host == o.Host || c.Origin.Host == net.JoinHostPort(o.Host, port))82	if !ok {83		log.Println("bad websocket origin:", o)84		return websocket.ErrBadWebSocketOrigin85	}86	log.Println("accepting connection from:", req.RemoteAddr)87	return nil88}89// socketHandler handles the websocket connection for a given present session.90// It handles transcoding Messages to and from JSON format, and starting91// and killing processes.92func socketHandler(c *websocket.Conn) {93	in, out := make(chan *Message), make(chan *Message)94	errc := make(chan error, 1)95	// Decode messages from client and send to the in channel.96	go func() {97		dec := json.NewDecoder(c)98		for {99			var m Message100			if err := dec.Decode(&m); err != nil {101				errc <- err102				return103			}104			in <- &m105		}106	}()107	// Receive messages from the out channel and encode to the client.108	go func() {109		enc := json.NewEncoder(c)110		for m := range out {111			if err := enc.Encode(m); err != nil {112				errc <- err113				return114			}115		}116	}()117	defer close(out)118	// Start and kill processes and handle errors.119	proc := make(map[string]*process)120	for {121		select {122		case m := <-in:123			switch m.Kind {124			case "run":125				log.Println("running snippet from:", c.Request().RemoteAddr)126				proc[m.Id].Kill()127				proc[m.Id] = startProcess(m.Id, m.Body, out, m.Options)128			case "kill":129				proc[m.Id].Kill()130			}131		case err := <-errc:132			if err != io.EOF {133				// A encode or decode has failed; bail.134				log.Println(err)135			}136			// Shut down any running processes.137			for _, p := range proc {138				p.Kill()139			}140			return141		}142	}143}144// process represents a running process.145type process struct {146	out  chan<- *Message147	done chan struct{} // closed when wait completes148	run  *exec.Cmd149	path string150}151// startProcess builds and runs the given program, sending its output152// and end event as Messages on the provided channel.153func startProcess(id, body string, dest chan<- *Message, opt *Options) *process {154	var (155		done = make(chan struct{})156		out  = make(chan *Message)157		p    = &process{out: out, done: done}158	)159	go func() {160		defer close(done)161		for m := range buffer(limiter(out, p), time.After) {162			m.Id = id163			dest <- m164		}165	}()166	var err error167	if path, args := shebang(body); path != "" {168		if RunScripts {169			err = p.startProcess(path, args, body)170		} else {171			err = errors.New("script execution is not allowed")172		}173	} else {174		err = p.start(body, opt)175	}176	if err != nil {177		p.end(err)178		return nil179	}180	go func() {181		p.end(p.run.Wait())182	}()183	return p184}185// end sends an "end" message to the client, containing the process id and the186// given error value. It also removes the binary, if present.187func (p *process) end(err error) {188	if p.path != "" {189		defer os.RemoveAll(p.path)190	}191	m := &Message{Kind: "end"}192	if err != nil {193		m.Body = err.Error()194	}195	p.out <- m196	close(p.out)197}198// A killer provides a mechanism to terminate a process.199// The Kill method returns only once the process has exited.200type killer interface {201	Kill()202}203// limiter returns a channel that wraps the given channel.204// It receives Messages from the given channel and sends them to the returned205// channel until it passes msgLimit messages, at which point it will kill the206// process and pass only the "end" message.207// When the given channel is closed, or when the "end" message is received,208// it closes the returned channel.209func limiter(in <-chan *Message, p killer) <-chan *Message {210	out := make(chan *Message)211	go func() {212		defer close(out)213		n := 0214		for m := range in {215			switch {216			case n < msgLimit || m.Kind == "end":217				out <- m218				if m.Kind == "end" {219					return220				}221			case n == msgLimit:222				// Kill in a goroutine as Kill will not return223				// until the process' output has been224				// processed, and we're doing that in this loop.225				go p.Kill()226			default:227				continue // don't increment228			}229			n++230		}231	}()232	return out233}234// buffer returns a channel that wraps the given channel. It receives messages235// from the given channel and sends them to the returned channel.236// Message bodies are gathered over the period msgDelay and coalesced into a237// single Message before they are passed on. Messages of the same kind are238// coalesced; when a message of a different kind is received, any buffered239// messages are flushed. When the given channel is closed, buffer flushes the240// remaining buffered messages and closes the returned channel.241// The timeAfter func should be time.After. It exists for testing.242func buffer(in <-chan *Message, timeAfter func(time.Duration) <-chan time.Time) <-chan *Message {243	out := make(chan *Message)244	go func() {245		defer close(out)246		var (247			tc    <-chan time.Time248			buf   []byte249			kind  string250			flush = func() {251				if len(buf) == 0 {252					return253				}254				out <- &Message{Kind: kind, Body: safeString(buf)}255				buf = buf[:0] // recycle buffer256				kind = ""257			}258		)259		for {260			select {261			case m, ok := <-in:262				if !ok {263					flush()264					return265				}266				if m.Kind == "end" {267					flush()268					out <- m269					return270				}271				if kind != m.Kind {272					flush()273					kind = m.Kind274					if tc == nil {275						tc = timeAfter(msgDelay)276					}277				}278				buf = append(buf, m.Body...)279			case <-tc:280				flush()281				tc = nil282			}283		}284	}()285	return out286}287// Kill stops the process if it is running and waits for it to exit.288func (p *process) Kill() {289	if p == nil || p.run == nil {290		return291	}292	p.run.Process.Kill()293	<-p.done // block until process exits294}295// shebang looks for a shebang ('#!') at the beginning of the passed string.296// If found, it returns the path and args after the shebang.297// args includes the command as args[0].298func shebang(body string) (path string, args []string) {299	body = strings.TrimSpace(body)300	if !strings.HasPrefix(body, "#!") {301		return "", nil302	}303	if i := strings.Index(body, "\n"); i >= 0 {304		body = body[:i]305	}306	fs := strings.Fields(body[2:])307	return fs[0], fs308}309// startProcess starts a given program given its path and passing the given body310// to the command standard input.311func (p *process) startProcess(path string, args []string, body string) error {312	cmd := &exec.Cmd{313		Path:   path,314		Args:   args,315		Stdin:  strings.NewReader(body),316		Stdout: &messageWriter{kind: "stdout", out: p.out},317		Stderr: &messageWriter{kind: "stderr", out: p.out},318	}319	if err := cmd.Start(); err != nil {320		return err321	}322	p.run = cmd323	return nil324}325// start builds and starts the given program, sending its output to p.out,326// and stores the running *exec.Cmd in the run field.327func (p *process) start(body string, opt *Options) error {328	// We "go build" and then exec the binary so that the329	// resultant *exec.Cmd is a handle to the user's program330	// (rather than the go tool process).331	// This makes Kill work.332	path, err := ioutil.TempDir("", "present-")333	if err != nil {334		return err335	}336	p.path = path // to be removed by p.end337	out := "prog"338	if runtime.GOOS == "windows" {339		out = "prog.exe"340	}341	bin := filepath.Join(path, out)342	// write body to x.go files343	a := txtar.Parse([]byte(body))344	if len(a.Comment) != 0 {345		a.Files = append(a.Files, txtar.File{Name: "prog.go", Data: a.Comment})346		a.Comment = nil347	}348	hasModfile := false349	for _, f := range a.Files {350		err = ioutil.WriteFile(filepath.Join(path, f.Name), f.Data, 0666)351		if err != nil {352			return err353		}354		if f.Name == "go.mod" {355			hasModfile = true356		}357	}358	// build x.go, creating x359	args := []string{"go", "build", "-tags", "OMIT"}360	if opt != nil && opt.Race {361		p.out <- &Message{362			Kind: "stderr",363			Body: "Running with race detector.\n",364		}365		args = append(args, "-race")366	}367	args = append(args, "-o", bin)368	cmd := p.cmd(path, args...)369	if !hasModfile {370		cmd.Env = append(cmd.Env, "GO111MODULE=off")371	}372	cmd.Stdout = cmd.Stderr // send compiler output to stderr373	if err := cmd.Run(); err != nil {374		return err375	}376	// run x377	if isNacl() {378		cmd, err = p.naclCmd(bin)379		if err != nil {380			return err381		}382	} else {383		cmd = p.cmd("", bin)384	}385	if opt != nil && opt.Race {386		cmd.Env = append(cmd.Env, "GOMAXPROCS=2")387	}388	if err := cmd.Start(); err != nil {389		// If we failed to exec, that might be because they built390		// a non-main package instead of an executable.391		// Check and report that.392		if name, err := packageName(body); err == nil && name != "main" {393			return errors.New(`executable programs must use "package main"`)394		}395		return err396	}397	p.run = cmd398	return nil399}400// cmd builds an *exec.Cmd that writes its standard output and error to the401// process' output channel.402func (p *process) cmd(dir string, args ...string) *exec.Cmd {403	cmd := exec.Command(args[0], args[1:]...)404	cmd.Dir = dir405	cmd.Env = Environ()406	cmd.Stdout = &messageWriter{kind: "stdout", out: p.out}407	cmd.Stderr = &messageWriter{kind: "stderr", out: p.out}408	return cmd409}410func isNacl() bool {411	for _, v := range append(Environ(), os.Environ()...) {412		if v == "GOOS=nacl" {413			return true414		}415	}416	return false417}418// naclCmd returns an *exec.Cmd that executes bin under native client.419func (p *process) naclCmd(bin string) (*exec.Cmd, error) {420	pwd, err := os.Getwd()421	if err != nil {422		return nil, err423	}424	var args []string425	env := []string{426		"NACLENV_GOOS=" + runtime.GOOS,427		"NACLENV_GOROOT=/go",428		"NACLENV_NACLPWD=" + strings.Replace(pwd, runtime.GOROOT(), "/go", 1),429	}430	switch runtime.GOARCH {431	case "amd64":432		env = append(env, "NACLENV_GOARCH=amd64p32")433		args = []string{"sel_ldr_x86_64"}434	case "386":435		env = append(env, "NACLENV_GOARCH=386")436		args = []string{"sel_ldr_x86_32"}437	case "arm":438		env = append(env, "NACLENV_GOARCH=arm")439		selLdr, err := exec.LookPath("sel_ldr_arm")440		if err != nil {441			return nil, err442		}443		args = []string{"nacl_helper_bootstrap_arm", selLdr, "--reserved_at_zero=0xXXXXXXXXXXXXXXXX"}444	default:445		return nil, errors.New("native client does not support GOARCH=" + runtime.GOARCH)446	}447	cmd := p.cmd("", append(args, "-l", "/dev/null", "-S", "-e", bin)...)448	cmd.Env = append(cmd.Env, env...)449	return cmd, nil450}451func packageName(body string) (string, error) {452	f, err := parser.ParseFile(token.NewFileSet(), "prog.go",453		strings.NewReader(body), parser.PackageClauseOnly)454	if err != nil {455		return "", err456	}457	return f.Name.String(), nil458}459// messageWriter is an io.Writer that converts all writes to Message sends on460// the out channel with the specified id and kind.461type messageWriter struct {462	kind string463	out  chan<- *Message464}465func (w *messageWriter) Write(b []byte) (n int, err error) {466	w.out <- &Message{Kind: w.kind, Body: safeString(b)}467	return len(b), nil468}469// safeString returns b as a valid UTF-8 string.470func safeString(b []byte) string {471	if utf8.Valid(b) {472		return string(b)473	}474	var buf bytes.Buffer475	for len(b) > 0 {476		r, size := utf8.DecodeRune(b)477		b = b[size:]478		buf.WriteRune(r)479	}480	return buf.String()...

Kind

Using AI Code Generation

1import (2func main() {3    fmt.Println(websocket.TextMessage)4    fmt.Println(websocket.BinaryMessage)5    fmt.Println(websocket.CloseMessage)6    fmt.Println(websocket.PingMessage)7    fmt.Println(websocket.PongMessage)8}

Kind

Using AI Code Generation

1import (  2var upgrader = websocket.Upgrader{  3    CheckOrigin: func(r *http.Request) bool {4    },5}6func main() {  7    http.HandleFunc(“/ws”, handleConnections)8    http.ListenAndServe(“:8080”, nil)9}10func handleConnections(w http.ResponseWriter, r *http.Request) {  11    ws, err := upgrader.Upgrade(w, r, nil)12    if err != nil {13        log.Fatal(err)14    }15    defer ws.Close()16    for {17        err := ws.ReadJSON(&msg)18        if err != nil {19            log.Printf(“error: %v”, err)20        }21    }22}23import (  24var addr = flag.String(“addr”, “:8080”, “http service address”)  25var homeTempl = template.Must(template.ParseFiles(“home.html”))26func home(w http.ResponseWriter, r *http.Request) {  27    if r.URL.Path != “/” {28        http.Error(w, “Not found”, 404)29    }30    if r.Method != “GET” {31        http.Error(w, “Method not allowed”, 405)32    }33    homeTempl.Execute(w, r.Host)34}35func serveWs(w http.ResponseWriter, r *http.Request) {  36    conn, err := (&websocket.Upgrader{CheckOrigin: func(r *http.Request) bool { return true }}).Upgrade(w, r, nil)37    if err != nil {38        log.Println(err)39    }40    defer conn.Close()41    for {42        _, p, err := conn.ReadMessage()43        if err != nil {44            log.Println(err)45        }46        fmt.Println(string

Kind

Using AI Code Generation

1import (2func main() {3    if err != nil {4        fmt.Println("Error in connection")5    }6    fmt.Println("Connected")7    var msg = make([]byte, 512)8    for {9        n, err = ws.Read(msg)10        if err != nil {11            fmt.Println("Error in reading")12        }13        fmt.Println(string(msg[:n]))14    }15}16import (17var upgrader = websocket.Upgrader{}18func main() {19    http.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) {20        conn, err := upgrader.Upgrade(w, r, nil)21        if err != nil {22            log.Println(err)23        }24        for {25            messageType, p, err := conn.ReadMessage()26            if err != nil {27                log.Println(err)28            }29            log.Printf("Received: %s", p)30            if err := conn.WriteMessage(messageType, p); err != nil {31                log.Println(err)32            }33        }34    })35    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {36        http.ServeFile(w, r, "index.html")37    })38    http.ListenAndServe(":8080", nil)39}40import (

Kind

Using AI Code Generation

1import (2func main() {3    if err != nil {4        panic(err)5    }6    fmt.Println(ws.Config().Origin)7    fmt.Println(ws.Config().Location)8    fmt.Println(ws.Config().Protocol)9    fmt.Println(ws.Config().Version)10    fmt.Println(ws.Config().Header)11    fmt.Println(ws.Config().UserAgent())12    fmt.Println(ws.Config().Origin.Scheme)13    fmt.Println(ws.Config().Origin.Host)14    fmt.Println(ws.Config().Origin.Path)15    fmt.Println(ws.Config().Origin.RawQuery)16    fmt.Println(ws.Config().Origin.Fragment)17    fmt.Println(ws.Config().Location.Scheme)18    fmt.Println(ws.Config().Location.Host)19    fmt.Println(ws.Config().Location.Path)20    fmt.Println(ws.Config().Location.RawQuery)21    fmt.Println(ws.Config().Location.Fragment)22    fmt.Println(ws.Config().Protocol[0])23    fmt.Println(ws.Config().Version)24    fmt.Println(ws.Config().Header["User-Agent"][0])25    fmt.Println(ws.Config().Header["Origin"][0])26    fmt.Println(ws.Config().Header["Sec-WebSocket-Key"][0])27    fmt.Println(ws.Config().Header["Sec-WebSocket-Version"][0])28    fmt.Println(ws.Config().Header["Sec-WebSocket-Extensions"][0])29    fmt.Println(ws.Config().Header["Sec-WebSocket-Accept"][0])30    fmt.Println(ws.Config().Header["Upgrade"][0])31    fmt.Println(ws.Config().Header["Connection"][0])32}33permessage-deflate; client_max_window_bits

Kind

Using AI Code Generation

1import (2func main() {3	if err != nil {4		fmt.Println(err)5	}6	fmt.Println(ws.Config().Origin)7	fmt.Println(ws.Config().Location)8	fmt.Println(ws.Config().Protocol)9	fmt.Println(ws.Config().Header)10	fmt.Println(ws.Config().Version)11	fmt.Println(ws.Config().HandshakeTimeout)12	fmt.Println(ws.Config().TlsConfig)13	fmt.Println(ws.Config().Origin)14	fmt.Println(ws.Config().Location)15	fmt.Println(ws.Config().Protocol)16	fmt.Println(ws.Config().Header)17	fmt.Println(ws.Config().Version)18	fmt.Println(ws.Config().HandshakeTimeout)19	fmt.Println(ws.Config().TlsConfig)20}

Kind

Using AI Code Generation

1import (2type WebSocket struct {3}4func (ws WebSocket) Kind() string {5}6func main() {7	ws := WebSocket{"ws"}8	fmt.Println(ws.Kind())9}10import (11type WebSocket struct {12}13func (ws WebSocket) Kind() string {14}15func main() {16	ws := WebSocket{"ws"}17	fmt.Println(ws.Kind())18}19import (20type WebSocket struct {21}22func (ws WebSocket) Kind() string {23}24func main() {25	ws := WebSocket{"ws"}26	fmt.Println(ws.Kind())27}28import (29type WebSocket struct {30}31func (ws WebSocket) Kind() string {32}33func main() {34	ws := WebSocket{"ws"}35	fmt.Println(ws.Kind())36}37import (38type WebSocket struct {39}40func (ws WebSocket) Kind() string {41}42func main() {43	ws := WebSocket{"ws"}44	fmt.Println(ws.Kind())

Kind

Using AI Code Generation

1import (2func main() {3    fmt.Println(ws.Kind())4}5Your name to display (optional):6Your name to display (optional):7Your name to display (optional):

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