Created
October 12, 2012 14:01
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Websocket proxy
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <meta http-equiv="content-type" content="text/html; charset=utf-8"> | |
| <title>Websockproxy test</title> | |
| <script type="text/javascript" charset="utf-8"> | |
| window.onload = function () { | |
| var ws = new WebSocket('ws://' + document.location.host + '/ws'); | |
| ws.onopen = function (ev) { | |
| }; | |
| ws.onclose = function (ev) { | |
| }; | |
| ws.onmessage = function (ev) { | |
| content.innerHTML = ev.data; | |
| }; | |
| ws.onerror = function (ev) { | |
| }; | |
| var input = document.getElementById("selector"); | |
| var contnt = document.getElementById("content"); | |
| input.onchange = function () { | |
| if (!input.value) { | |
| content.innerHTML = ''; | |
| } else { | |
| ws.send(input.value + '\n'); | |
| } | |
| } | |
| }; | |
| </script> | |
| </head> | |
| <body> | |
| URL: <input id="selector" type="search" style="width:600px"> | |
| <hr> | |
| <div id="content"></div> | |
| </body> | |
| </html> |
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| package main | |
| import ( | |
| "bufio" | |
| "code.google.com/p/go.net/websocket" | |
| "fmt" | |
| "io" | |
| "io/ioutil" | |
| "net/http" | |
| ) | |
| func readWebsocket(ws *websocket.Conn) (chan string, chan error) { | |
| cMessages := make(chan string, 32) | |
| cErr := make(chan error) | |
| go func() { | |
| defer fmt.Println("Websocket reader closed") | |
| r := bufio.NewReader(ws) | |
| for { | |
| msg, err := r.ReadBytes('\n') | |
| if err != nil { | |
| cErr <- err | |
| return | |
| } | |
| cMessages <- string(msg[:len(msg)-1]) | |
| } | |
| }() | |
| return cMessages, cErr | |
| } | |
| func getPage(url string) []byte { | |
| fmt.Printf("Get page: %s\n", url) | |
| resp, err := http.Get(url) | |
| if err != nil { | |
| return []byte(err.Error()) | |
| } | |
| content, err := ioutil.ReadAll(resp.Body) | |
| if err != nil { | |
| return []byte(err.Error()) | |
| } | |
| return content | |
| } | |
| func clientHandler(ws *websocket.Conn) { | |
| defer fmt.Println("Client disconnected") | |
| wsmsg, wserr := readWebsocket(ws) | |
| for { | |
| select { | |
| case msg := <-wsmsg: | |
| ws.Write(getPage(msg)) | |
| case err := <-wserr: | |
| if err == io.EOF { | |
| return | |
| } | |
| panic(err) | |
| } | |
| } | |
| } | |
| func main() { | |
| http.Handle("/", http.FileServer(http.Dir("/home/husio/websockproxy"))) | |
| http.Handle("/ws", websocket.Handler(clientHandler)) | |
| if err := http.ListenAndServe(":8080", nil); err != nil { | |
| panic(err) | |
| } | |
| } |
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