103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
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package main
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import (
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"io"
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"net"
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"net/http"
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"net/url"
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"github.com/surge/glog"
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"golang.org/x/net/websocket"
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)
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func DefaultListenAndServeWebsocket() error {
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if err := AddWebsocketHandler("/mqtt", "test.mosquitto.org:1883"); err != nil {
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return err
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}
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return ListenAndServeWebsocket(":1234")
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}
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func AddWebsocketHandler(urlPattern string, uri string) error {
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glog.Debugf("AddWebsocketHandler urlPattern=%s, uri=%s", urlPattern, uri)
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u, err := url.Parse(uri)
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if err != nil {
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glog.Errorf("surgemq/main: %v", err)
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return err
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}
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h := func(ws *websocket.Conn) {
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WebsocketTcpProxy(ws, u.Scheme, u.Host)
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}
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http.Handle(urlPattern, websocket.Handler(h))
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return nil
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}
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/* start a listener that proxies websocket <-> tcp */
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func ListenAndServeWebsocket(addr string) error {
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return http.ListenAndServe(addr, nil)
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}
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/* starts an HTTPS listener */
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func ListenAndServeWebsocketSecure(addr string, cert string, key string) error {
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return http.ListenAndServeTLS(addr, cert, key, nil)
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}
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/* copy from websocket to writer, this copies the binary frames as is */
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func io_copy_ws(src *websocket.Conn, dst io.Writer) (int, error) {
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var buffer []byte
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count := 0
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for {
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err := websocket.Message.Receive(src, &buffer)
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if err != nil {
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return count, err
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}
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n := len(buffer)
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count += n
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i, err := dst.Write(buffer)
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if err != nil || i < 1 {
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return count, err
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}
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}
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return count, nil
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}
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/* copy from reader to websocket, this copies the binary frames as is */
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func io_ws_copy(src io.Reader, dst *websocket.Conn) (int, error) {
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buffer := make([]byte, 2048)
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count := 0
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for {
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n, err := src.Read(buffer)
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if err != nil || n < 1 {
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return count, err
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}
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count += n
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err = websocket.Message.Send(dst, buffer[0:n])
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if err != nil {
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return count, err
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}
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}
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return count, nil
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}
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/* handler that proxies websocket <-> unix domain socket */
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func WebsocketTcpProxy(ws *websocket.Conn, nettype string, host string) error {
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client, err := net.Dial(nettype, host)
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if err != nil {
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return err
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}
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defer client.Close()
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defer ws.Close()
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chDone := make(chan bool)
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go func() {
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io_ws_copy(client, ws)
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chDone <- true
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}()
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go func() {
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io_copy_ws(ws, client)
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chDone <- true
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}()
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<-chDone
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return nil
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}
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