feat: embed terasu inside

vendor/golang.org/x/net/http2/transport.go

@@ -31,6 +31,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/fumiama/terasu"
 	"golang.org/x/net/http/httpguts"
 	"golang.org/x/net/http2/hpack"
 	"golang.org/x/net/idna"
@@ -3275,13 +3276,22 @@ func traceGot1xxResponseFunc(trace *httptrace.ClientTrace) func(int, textproto.M
 // dialTLSWithContext uses tls.Dialer, added in Go 1.15, to open a TLS
 // connection.
 func (t *Transport) dialTLSWithContext(ctx context.Context, network, addr string, cfg *tls.Config) (*tls.Conn, error) {
-	dialer := &tls.Dialer{
-		Config: cfg,
-	}
+	dialer := &net.Dialer{}
 	cn, err := dialer.DialContext(ctx, network, addr)
 	if err != nil {
 		return nil, err
 	}
-	tlsCn := cn.(*tls.Conn) // DialContext comment promises this will always succeed
+	tlsCn := tls.Client(terasu.NewConn(cn), cfg)
+	if deadline, ok := ctx.Deadline(); ok {
+		cn.SetDeadline(deadline)
+	}
+	err = tlsCn.Handshake()
+	if _, ok := ctx.Deadline(); ok {
+		cn.SetDeadline(time.Time{})
+	}
+	if err != nil {
+		cn.Close()
+		return nil, err
+	}
 	return tlsCn, nil
 }