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December 11, 2015 16:09
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Serving stdout using websockets and Go.
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| package main | |
| import ( | |
| "code.google.com/p/go.net/websocket" | |
| "flag" | |
| "log" | |
| "net/http" | |
| "os" | |
| ) | |
| var connections map[*websocket.Conn]bool | |
| var stream chan []byte | |
| var registration chan *websocket.Conn | |
| func reader() { | |
| for { | |
| buf := make([]byte, 16) | |
| if _, err := os.Stdin.Read(buf); err != nil { | |
| log.Fatal(err) | |
| } | |
| stream <- buf | |
| } | |
| } | |
| func server() { | |
| for { | |
| select { | |
| case ws := <-registration: | |
| connections[ws] = true | |
| case msg := <-stream: | |
| for ws := range connections { | |
| if _, err := ws.Write(msg); err != nil { | |
| ws.Close() | |
| delete(connections, ws) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| func handleWebSocket(ws *websocket.Conn) { | |
| buf := make([]byte, 1) | |
| registration <- ws | |
| for { | |
| if _, err := ws.Read(buf); err != nil { | |
| break | |
| } | |
| } | |
| } | |
| func handleMain(w http.ResponseWriter, r *http.Request) { | |
| body := "<!DOCTYPE html>\n<html lang='en'>" + | |
| "<head><meta charset=\"utf-8\"><title>stdout</title>" + | |
| "<script>" + | |
| "window.onload = function () {" + | |
| "conn = new WebSocket(\"ws://\"+window.location.host+\"/ws\");" + | |
| "conn.onmessage = function(evt) {" + | |
| "var dump = document.getElementById(\"dump\");" + | |
| "dump.innerHTML = dump.innerHTML + evt.data;" + | |
| "window.scrollTo(0, document.body.scrollHeight);}}" + | |
| "</script>" + | |
| "</head>" + | |
| "<body>" + | |
| "<pre id=\"dump\"></pre>" + | |
| "</body>" + | |
| "</html>" | |
| w.Write([]byte(body)) | |
| } | |
| func main() { | |
| connections = make(map[*websocket.Conn]bool) | |
| stream = make(chan []byte) | |
| registration = make(chan *websocket.Conn) | |
| addr := flag.String("p", ":8080", "socket to listen on") | |
| flag.Parse() | |
| http.Handle("/ws", websocket.Handler(handleWebSocket)) | |
| http.HandleFunc("/", handleMain) | |
| go server() | |
| go reader() | |
| log.Fatal(http.ListenAndServe(*addr, nil)) | |
| } |
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