stop delay timers in the proxy when it is closed

integrationtests/tools/proxy/proxy.go

@@ -87,6 +87,9 @@ type QuicProxy struct {
 	dropPacket  DropCallback
 	delayPacket DelayCallback
 
+	timerID uint64
+	timers  map[uint64]*time.Timer
+
 	// Mapping from client addresses (as host:port) to connection
 	clientDict map[string]*connection
 
@@ -127,6 +130,7 @@ func NewQuicProxy(local string, opts *Opts) (*QuicProxy, error) {
 		serverAddr:  raddr,
 		dropPacket:  packetDropper,
 		delayPacket: packetDelayer,
+		timers:      make(map[uint64]*time.Timer),
 		logger:      utils.DefaultLogger.WithPrefix("proxy"),
 	}
 
@@ -144,6 +148,9 @@ func (p *QuicProxy) Close() error {
 			return err
 		}
 	}
+	for _, t := range p.timers {
+		t.Stop()
+	}
 	return p.conn.Close()
 }
 
@@ -206,10 +213,19 @@ func (p *QuicProxy) runProxy() error {
 			if p.logger.Debug() {
 				p.logger.Debugf("delaying incoming packet (%d bytes) to %s by %s", n, conn.ServerConn.RemoteAddr(), delay)
 			}
-			time.AfterFunc(delay, func() {
+
-				// TODO: handle error
+			p.mutex.Lock()
-				_, _ = conn.ServerConn.Write(raw)
+			p.timerID++
+			id := p.timerID
+			timer := time.AfterFunc(delay, func() {
+				_, _ = conn.ServerConn.Write(raw) // TODO: handle error
+
+				p.mutex.Lock()
+				delete(p.timers, id)
+				p.mutex.Unlock()
 			})
+			p.timers[id] = timer
+			p.mutex.Unlock()
 		} else {
 			if p.logger.Debug() {
 				p.logger.Debugf("forwarding incoming packet (%d bytes) to %s", n, conn.ServerConn.RemoteAddr())
@@ -243,10 +259,18 @@ func (p *QuicProxy) runConnection(conn *connection) error {
 			if p.logger.Debug() {
 				p.logger.Debugf("delaying outgoing packet (%d bytes) to %s by %s", n, conn.ClientAddr, delay)
 			}
-			time.AfterFunc(delay, func() {
+
-				// TODO: handle error
+			p.mutex.Lock()
-				_, _ = p.conn.WriteToUDP(raw, conn.ClientAddr)
+			p.timerID++
+			id := p.timerID
+			timer := time.AfterFunc(delay, func() {
+				_, _ = p.conn.WriteToUDP(raw, conn.ClientAddr) // TODO: handle error
+				p.mutex.Lock()
+				delete(p.timers, id)
+				p.mutex.Unlock()
 			})
+			p.timers[id] = timer
+			p.mutex.Unlock()
 		} else {
 			if p.logger.Debug() {
 				p.logger.Debugf("forwarding outgoing packet (%d bytes) to %s", n, conn.ClientAddr)