Created
May 19, 2021 04:41
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websocket example on go, echo
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>signaling</title> | |
| </head> | |
| <body> | |
| <div class="websocketControl"> | |
| <button class="websocketControl_openCloseButton">open</button> | |
| </div> | |
| <div class="input"> | |
| <input type="text"> | |
| <button class="input_sendButton">send</button> | |
| </div> | |
| <div class="output"> | |
| </div> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| package main | |
| import ( | |
| "net/http" | |
| "time" | |
| "github.com/gorilla/websocket" | |
| "github.com/labstack/echo/v4" | |
| "github.com/rs/zerolog" | |
| "github.com/rs/zerolog/log" | |
| ) | |
| var upgrader = websocket.Upgrader{} | |
| func signalingServer(c echo.Context) error { | |
| w := c.Response() | |
| r := c.Request() | |
| conn, err := upgrader.Upgrade(w, r, nil) | |
| if err != nil { | |
| return err | |
| } | |
| defer conn.Close() | |
| log.Debug().Msg("websocket start!") | |
| for { | |
| mt, p, err := conn.ReadMessage() | |
| if err != nil { | |
| return err | |
| } | |
| rcvmsg := string(p) | |
| log.Debug().Str("p", rcvmsg).Msg("received") | |
| err = conn.WriteMessage(mt, ([]byte)(rcvmsg + rcvmsg)) | |
| if err != nil { | |
| return err | |
| } | |
| } | |
| } | |
| func main() { | |
| e := echo.New() | |
| zerolog.TimeFieldFormat = time.RFC3339Nano | |
| zerolog.SetGlobalLevel(zerolog.DebugLevel) | |
| e.GET("/hello", func(c echo.Context) error { | |
| return c.HTML(http.StatusOK, "<h1>hello</h1>") | |
| }) | |
| e.GET("/ws", signalingServer) | |
| e.Static("/", "./web") | |
| e.Logger.Fatal(e.Start(":8080")) | |
| } |
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| "use strict"; | |
| let ws = null; | |
| const print = ((output) => { | |
| return (msg) => { | |
| const d = document.createElement("div"); | |
| d.textContent = msg; | |
| output.appendChild(d); | |
| output.scroll(0, output.scrollHeight); | |
| }; | |
| })(document.querySelector("div.output")); | |
| const initWebsocket = (websocket) => { | |
| websocket.addEventListener("open", () => print("open")); | |
| websocket.addEventListener("close", () => { | |
| print("close"); | |
| ws = null; | |
| }); | |
| websocket.addEventListener("message", (event) => { | |
| print("response: " + event.data); | |
| }); | |
| websocket.addEventListener("error", (event) => { | |
| console.log("error:", event.data); | |
| }); | |
| return websocket; | |
| }; | |
| document | |
| .querySelector(".websocketControl_openCloseButton") | |
| .addEventListener("click", (event) => { | |
| console.log("openClose button clicked", ws == null); | |
| if (ws == null) { | |
| // open websocket | |
| ws = new WebSocket("ws://localhost:8080/ws"); | |
| initWebsocket(ws); | |
| // change button text for close | |
| event.target.innerText = "close"; | |
| } else { | |
| ws.close(); | |
| // change button text for open | |
| event.target.innerText = "open"; | |
| } | |
| }); | |
| document | |
| .querySelector(".input_sendButton") | |
| .addEventListener("click", (event) => { | |
| if (ws == null) { | |
| print("ws is null"); | |
| return; | |
| } | |
| const input = document.querySelector("input"); | |
| print("send: " + input.value); | |
| ws.send(input.value); | |
| return; | |
| }); |
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