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111 lines
1.7 KiB
Go
111 lines
1.7 KiB
Go
package obfssh
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"net"
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"net/http"
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"sync"
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"time"
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"github.com/fangdingjun/go-log/v5"
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"github.com/gorilla/websocket"
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)
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type wsConn struct {
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*websocket.Conn
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buf *bytes.Buffer
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mu *sync.Mutex
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ch chan struct{}
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}
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var _ net.Conn = &wsConn{}
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// NewWSConn dial to websocket server and return net.Conn
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func NewWSConn(p string) (net.Conn, error) {
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conn, resp, err := websocket.DefaultDialer.Dial(p, nil)
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if err != nil {
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return nil, err
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}
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resp.Body.Close()
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if resp.StatusCode != http.StatusSwitchingProtocols {
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return nil, fmt.Errorf("http status %d", resp.StatusCode)
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}
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c := &wsConn{Conn: conn,
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buf: bytes.NewBuffer(nil),
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mu: new(sync.Mutex),
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ch: make(chan struct{}),
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}
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go c.readLoop()
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return c, nil
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}
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func (wc *wsConn) readLoop() {
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for {
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_, data, err := wc.ReadMessage()
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if err != nil {
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log.Debugln(err)
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close(wc.ch)
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break
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}
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wc.mu.Lock()
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wc.buf.Write(data)
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wc.mu.Unlock()
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select {
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case wc.ch <- struct{}{}:
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default:
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}
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}
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}
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func (wc *wsConn) Read(buf []byte) (int, error) {
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wc.mu.Lock()
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n, err := wc.buf.Read(buf)
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if err == nil {
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wc.mu.Unlock()
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return n, err
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}
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wc.mu.Unlock()
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if err != io.EOF {
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return 0, err
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}
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// EOF, no data avaliable, read again
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select {
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case _, ok := <-wc.ch:
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if !ok {
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return 0, errors.New("connection closed")
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}
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}
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wc.mu.Lock()
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defer wc.mu.Unlock()
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return wc.buf.Read(buf)
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}
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func (wc *wsConn) Write(buf []byte) (int, error) {
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err := wc.WriteMessage(websocket.BinaryMessage, buf)
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return len(buf), err
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}
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func (wc *wsConn) SetDeadline(t time.Time) error {
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if err := wc.SetReadDeadline(t); err != nil {
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return err
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}
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if err := wc.SetWriteDeadline(t); err != nil {
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return err
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}
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return nil
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}
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