add webtransport tunnel

dialer/http3/wt/client.go

@@ -0,0 +1,58 @@
+package wt
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+
+	"github.com/go-gost/core/logger"
+	wt_util "github.com/go-gost/x/internal/util/wt"
+	wt "github.com/quic-go/webtransport-go"
+)
+
+type Client struct {
+	host    string
+	path    string
+	header  http.Header
+	dialer  *wt.Dialer
+	session *wt.Session
+	log     logger.Logger
+}
+
+func (c *Client) Dial(ctx context.Context, addr string) (net.Conn, error) {
+	ok := false
+	if c.session != nil {
+		select {
+		case <-c.session.Context().Done():
+		default:
+			ok = true
+		}
+	}
+	if !ok {
+		url := url.URL{
+			Scheme: "https",
+			Host:   c.host,
+			Path:   c.path,
+		}
+		resp, session, err := c.dialer.Dial(ctx, url.String(), c.header)
+		if err != nil {
+			return nil, err
+		}
+
+		if c.log.IsLevelEnabled(logger.TraceLevel) {
+			dump, _ := httputil.DumpResponse(resp, false)
+			c.log.Trace(string(dump))
+		}
+
+		c.session = session
+	}
+
+	stream, err := c.session.OpenStream()
+	if err != nil {
+		return nil, err
+	}
+
+	return wt_util.Conn(c.session, stream), nil
+}