export qlog files if the QLOGDIR env is set in interop client and server

interop/client/main.go

@@ -13,6 +13,7 @@ import (
 
 	"golang.org/x/sync/errgroup"
 
+	"github.com/lucas-clemente/quic-go"
 	"github.com/lucas-clemente/quic-go/http3"
 	"github.com/lucas-clemente/quic-go/internal/protocol"
 	"github.com/lucas-clemente/quic-go/interop/http09"
@@ -60,9 +61,18 @@ func runTestcase(testcase string) error {
 	flag.Parse()
 	urls := flag.Args()
 
+	getLogWriter, err := utils.GetQLOGWriter()
+	if err != nil {
+		return err
+	}
+	quicConf := &quic.Config{GetLogWriter: getLogWriter}
+
 	switch testcase {
 	case "http3":
-		r := &http3.RoundTripper{TLSClientConfig: tlsConf}
+		r := &http3.RoundTripper{
+			TLSClientConfig: tlsConf,
+			QuicConfig:      quicConf,
+		}
 		defer r.Close()
 		return downloadFiles(r, urls)
 	case "handshake", "transfer", "retry":
@@ -76,7 +86,10 @@ func runTestcase(testcase string) error {
 		return errUnsupported
 	}
 
-	r := &http09.RoundTripper{TLSClientConfig: tlsConf}
+	r := &http09.RoundTripper{
+		TLSClientConfig: tlsConf,
+		QuicConfig:      quicConf,
+	}
 	defer r.Close()
 	return downloadFiles(r, urls)
 }