Apply commented improvements

- skip shutdown of gRPC server if failed to start
- minor refactoring

internal/rpc/endpoints_server.go

@@ -10,17 +10,26 @@ type endpointsServer struct {
 }
 
 func (e endpointsServer) GetEndpoints(_ context.Context, _ *GetEndpointsRequest) (*GetEndpointsResponse, error) {
-	eps := make([]*Endpoint, 0)
-	for _, ep := range e.endpointsManager.StartedEndpoints() {
-		eps = append(eps, &Endpoint{
+	eps := rpcEndpointsFromEndpoints(e.endpointsManager.StartedEndpoints())
+	return &GetEndpointsResponse{
+		Endpoints: *eps,
+	}, nil
+}
+
+func rpcEndpointsFromEndpoints(eps []endpoints.Endpoint) *[]*Endpoint {
+	out := make([]*Endpoint, 0)
+	for _, ep := range eps {
+		out = append(out, rpcEndpointFromEndpoint(ep))
+	}
+	return &out
+}
+
+func rpcEndpointFromEndpoint(ep endpoints.Endpoint) *Endpoint {
+	return &Endpoint{
 		Id:            ep.Id().String(),
 		Name:          ep.Name(),
 		Handler:       ep.Handler(),
 		ListenAddress: ep.Listen(),
 		Port:          int32(ep.Port()),
-		})
 	}
-	return &GetEndpointsResponse{
-		Endpoints: eps,
-	}, nil
 }

internal/rpc/grpc_api.go

@@ -23,6 +23,7 @@ type inetmockAPI struct {
 	endpointManager endpoints.EndpointManager
 	registry        plugins.HandlerRegistry
 	logger          logging.Logger
+	serverRunning   bool
 }
 
 func NewINetMockAPI(
@@ -56,6 +57,12 @@ func (i *inetmockAPI) StartServer() (err error) {
 }
 
 func (i *inetmockAPI) StopServer() {
+	if !i.serverRunning {
+		i.logger.Info(
+			"Skipping API server shutdown because server is not running",
+		)
+		return
+	}
 	gracefulStopChan := make(chan struct{})
 	go func() {
 		i.server.GracefulStop()
@@ -70,7 +77,9 @@ func (i *inetmockAPI) StopServer() {
 }
 
 func (i *inetmockAPI) startServerAsync(listener net.Listener) {
+	i.serverRunning = true
 	if err := i.server.Serve(listener); err != nil {
+		i.serverRunning = false
 		i.logger.Error(
 			"failed to start INetMock API",
 			zap.Error(err),