[client,relay] Add QUIC support (#2962)

relay/server/server.go

@@ -3,13 +3,17 @@ package server
 import (
 	"context"
 	"crypto/tls"
+	"sync"
 
-	log "github.com/sirupsen/logrus"
+	"github.com/hashicorp/go-multierror"
 	"go.opentelemetry.io/otel/metric"
 
+	nberrors "github.com/netbirdio/netbird/client/errors"
 	"github.com/netbirdio/netbird/relay/auth"
 	"github.com/netbirdio/netbird/relay/server/listener"
+	"github.com/netbirdio/netbird/relay/server/listener/quic"
 	"github.com/netbirdio/netbird/relay/server/listener/ws"
+	quictls "github.com/netbirdio/netbird/relay/tls"
 )
 
 // ListenerConfig is the configuration for the listener.
@@ -24,8 +28,8 @@ type ListenerConfig struct {
 // It is the gate between the WebSocket listener and the Relay server logic.
 // In a new HTTP connection, the server will accept the connection and pass it to the Relay server via the Accept method.
 type Server struct {
-	relay      *Relay
-	wSListener listener.Listener
+	relay     *Relay
+	listeners []listener.Listener
 }
 
 // NewServer creates a new relay server instance.
@@ -39,35 +43,63 @@ func NewServer(meter metric.Meter, exposedAddress string, tlsSupport bool, authV
 		return nil, err
 	}
 	return &Server{
-		relay: relay,
+		relay:     relay,
+		listeners: make([]listener.Listener, 0, 2),
 	}, nil
 }
 
 // Listen starts the relay server.
 func (r *Server) Listen(cfg ListenerConfig) error {
-	r.wSListener = &ws.Listener{
+	wSListener := &ws.Listener{
 		Address:   cfg.Address,
 		TLSConfig: cfg.TLSConfig,
 	}
+	r.listeners = append(r.listeners, wSListener)
 
-	wslErr := r.wSListener.Listen(r.relay.Accept)
-	if wslErr != nil {
-		log.Errorf("failed to bind ws server: %s", wslErr)
+	tlsConfigQUIC, err := quictls.ServerQUICTLSConfig(cfg.TLSConfig)
+	if err != nil {
+		return err
 	}
 
-	return wslErr
+	quicListener := &quic.Listener{
+		Address:   cfg.Address,
+		TLSConfig: tlsConfigQUIC,
+	}
+
+	r.listeners = append(r.listeners, quicListener)
+
+	errChan := make(chan error, len(r.listeners))
+	wg := sync.WaitGroup{}
+	for _, l := range r.listeners {
+		wg.Add(1)
+		go func(listener listener.Listener) {
+			defer wg.Done()
+			errChan <- listener.Listen(r.relay.Accept)
+		}(l)
+	}
+
+	wg.Wait()
+	close(errChan)
+	var multiErr *multierror.Error
+	for err := range errChan {
+		multiErr = multierror.Append(multiErr, err)
+	}
+
+	return nberrors.FormatErrorOrNil(multiErr)
 }
 
 // Shutdown stops the relay server. If there are active connections, they will be closed gracefully. In case of a context,
 // the connections will be forcefully closed.
-func (r *Server) Shutdown(ctx context.Context) (err error) {
-	// stop service new connections
-	if r.wSListener != nil {
-		err = r.wSListener.Shutdown(ctx)
-	}
-
+func (r *Server) Shutdown(ctx context.Context) error {
 	r.relay.Shutdown(ctx)
-	return
+
+	var multiErr *multierror.Error
+	for _, l := range r.listeners {
+		if err := l.Shutdown(ctx); err != nil {
+			multiErr = multierror.Append(multiErr, err)
+		}
+	}
+	return nberrors.FormatErrorOrNil(multiErr)
 }
 
 // InstanceURL returns the instance URL of the relay server.