p2p/simulations: fix staticcheck warnings (#20322)

p2p/simulations/http.go

@@ -384,12 +384,6 @@ func (s *Server) StreamNetworkEvents(w http.ResponseWriter, req *http.Request) {
 	sub := s.network.events.Subscribe(events)
 	defer sub.Unsubscribe()
 
-	// stop the stream if the client goes away
-	var clientGone <-chan bool
-	if cn, ok := w.(http.CloseNotifier); ok {
-		clientGone = cn.CloseNotify()
-	}
-
 	// write writes the given event and data to the stream like:
 	//
 	// event: <event>
@@ -455,6 +449,7 @@ func (s *Server) StreamNetworkEvents(w http.ResponseWriter, req *http.Request) {
 		}
 	}
 
+	clientGone := req.Context().Done()
 	for {
 		select {
 		case event := <-events:
@@ -710,7 +705,7 @@ func (s *Server) wrapHandler(handler http.HandlerFunc) httprouter.Handle {
 		w.Header().Set("Access-Control-Allow-Origin", "*")
 		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
 
-		ctx := context.Background()
+		ctx := req.Context()
 
 		if id := params.ByName("nodeid"); id != "" {
 			var nodeID enode.ID