make it possible to monitor if the webhook server has been started

Signed-off-by: Stefan Büringer buringerst@vmware.com

pkg/webhook/server.go

@@ -87,6 +87,10 @@ type Server struct {
 	// defaultingOnce ensures that the default fields are only ever set once.
 	defaultingOnce sync.Once
 
+	// started is set to true immediately before the server is started
+	// and thus can be used to check if the server has been started
+	started bool
+
 	// mu protects access to the webhook map & setFields for Start, Register, etc
 	mu sync.Mutex
 }
@@ -272,6 +276,9 @@ func (s *Server) Start(ctx context.Context) error {
 		close(idleConnsClosed)
 	}()
 
+	s.mu.Lock()
+	s.started = true
+	s.mu.Unlock()
 	if err := srv.Serve(listener); err != nil && err != http.ErrServerClosed {
 		return err
 	}
@@ -280,6 +287,13 @@ func (s *Server) Start(ctx context.Context) error {
 	return nil
 }
 
+// Started returns if the server has been started
+func (s *Server) Started() bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.started
+}
+
 // InjectFunc injects the field setter into the server.
 func (s *Server) InjectFunc(f inject.Func) error {
 	s.setFields = f

pkg/webhook/server_test.go

@@ -137,6 +137,8 @@ var _ = Describe("Webhook Server", func() {
 				return ioutil.ReadAll(resp.Body)
 			}).Should(Equal([]byte("gadzooks!")))
 
+			Expect(server.Started()).To(BeTrue())
+
 			ctxCancel()
 			Eventually(doneCh, "4s").Should(BeClosed())
 		})