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Stream a command stderr and stdout throught websockets
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| package main | |
| import ( | |
| "bufio" | |
| "fmt" | |
| "github.com/gorilla/websocket" | |
| "io" | |
| "log" | |
| "net/http" | |
| "os/exec" | |
| ) | |
| var html = []byte( | |
| `<html> | |
| <body> | |
| <h1>blah.exe</h1> | |
| <code></code> | |
| <script> | |
| var ws = new WebSocket("ws://127.0.0.1:8000/ws") | |
| ws.onmessage = function(e) { | |
| document.querySelector("code").innerHTML += e.data + "<br>" | |
| } | |
| </script> | |
| </body> | |
| </html> | |
| `) | |
| var upgrader = websocket.Upgrader{ | |
| ReadBufferSize: 1024, | |
| WriteBufferSize: 1024, | |
| } | |
| func main() { | |
| http.HandleFunc("/ws", cmdToResponse) | |
| http.HandleFunc("/", serveHtml) | |
| log.Println("Listening on :8000") | |
| err := http.ListenAndServe(":8000", nil) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| } | |
| func cmdToResponse(w http.ResponseWriter, r *http.Request) { | |
| ws, err := upgrader.Upgrade(w, r, nil) | |
| if err != nil { | |
| w.Write([]byte(fmt.Sprintf("", err))) | |
| return | |
| } | |
| defer ws.Close() | |
| // discard received messages | |
| go func(c *websocket.Conn) { | |
| for { | |
| if _, _, err := c.NextReader(); err != nil { | |
| c.Close() | |
| break | |
| } | |
| } | |
| }(ws) | |
| ws.WriteMessage(1, []byte("Starting...\n")) | |
| // execute and get a pipe | |
| cmd := exec.Command("blah.exe") | |
| stdout, err := cmd.StdoutPipe() | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| stderr, err := cmd.StderrPipe() | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| if err := cmd.Start(); err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| s := bufio.NewScanner(io.MultiReader(stdout, stderr)) | |
| for s.Scan() { | |
| ws.WriteMessage(1, s.Bytes()) | |
| } | |
| if err := cmd.Wait(); err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| ws.WriteMessage(1, []byte("Finished\n")) | |
| } | |
| func serveHtml(w http.ResponseWriter, r *http.Request) { | |
| w.Write(html) | |
| } |
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