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