netbird/relay/client/dialer/ws/conn.go

package ws

import (
	"context"
	"fmt"
	"net"
	"time"

	"nhooyr.io/websocket"
)

type Conn struct {
	ctx context.Context
	*websocket.Conn
	remoteAddr WebsocketAddr
}

func NewConn(wsConn *websocket.Conn, serverAddress string) net.Conn {
	return &Conn{
		ctx:        context.Background(),
		Conn:       wsConn,
		remoteAddr: WebsocketAddr{serverAddress},
	}
}

func (c *Conn) Read(b []byte) (n int, err error) {
	t, ioReader, err := c.Conn.Reader(c.ctx)
	if err != nil {
		// todo use ErrClosedByServer
		return 0, err
	}

	if t != websocket.MessageBinary {
		return 0, fmt.Errorf("unexpected message type")
	}

	return ioReader.Read(b)
}

func (c *Conn) Write(b []byte) (n int, err error) {
	err = c.Conn.Write(c.ctx, websocket.MessageBinary, b)
	return 0, err
}

func (c *Conn) RemoteAddr() net.Addr {
	return c.remoteAddr
}

func (c *Conn) LocalAddr() net.Addr {
	return WebsocketAddr{addr: "unknown"}
}

func (c *Conn) SetReadDeadline(t time.Time) error {
	return fmt.Errorf("SetReadDeadline is not implemented")
}

func (c *Conn) SetWriteDeadline(t time.Time) error {
	return fmt.Errorf("SetWriteDeadline is not implemented")
}

func (c *Conn) SetDeadline(t time.Time) error {
	return fmt.Errorf("SetDeadline is not implemented")
}

func (c *Conn) Close() error {
	return c.Conn.CloseNow()
}