Add initial relay code

relay/client/dialer/tcp/tcp.go

@@ -0,0 +1,7 @@
+package tcp
+
+import "net"
+
+func Dial(address string) (net.Conn, error) {
+	return net.Dial("tcp", address)
+}

relay/client/dialer/ws/client_conn.go

@@ -0,0 +1,56 @@
+package ws
+
+import (
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+type Conn struct {
+	*websocket.Conn
+}
+
+func NewConn(wsConn *websocket.Conn) net.Conn {
+	return &Conn{
+		wsConn,
+	}
+}
+
+func (c *Conn) Read(b []byte) (n int, err error) {
+	t, r, err := c.NextReader()
+	if err != nil {
+		return 0, err
+	}
+
+	if t != websocket.BinaryMessage {
+		return 0, fmt.Errorf("unexpected message type")
+	}
+
+	return r.Read(b)
+}
+
+func (c *Conn) Write(b []byte) (int, error) {
+	err := c.WriteMessage(websocket.BinaryMessage, b)
+	return len(b), err
+}
+
+func (c *Conn) SetDeadline(t time.Time) error {
+	errR := c.SetReadDeadline(t)
+	errW := c.SetWriteDeadline(t)
+
+	if errR != nil {
+		return errR
+	}
+
+	if errW != nil {
+		return errW
+	}
+	return nil
+}
+
+func (c *Conn) Close() error {
+	_ = c.WriteControl(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""), time.Now().Add(time.Second*5))
+	return c.Conn.Close()
+}

relay/client/dialer/ws/ws.go

@@ -0,0 +1,18 @@
+package ws
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/gorilla/websocket"
+)
+
+func Dial(address string) (net.Conn, error) {
+	addr := fmt.Sprintf("ws://" + address)
+	wsConn, _, err := websocket.DefaultDialer.Dial(addr, nil)
+	if err != nil {
+		return nil, err
+	}
+	conn := NewConn(wsConn)
+	return conn, nil
+}