func NewService()

in internal/metrics/service.go [33:73]

• 35 lines of code
• 8 McCabe index (conditional complexity)

func NewService(resource *MonitoredResource, views []*view.View) (*Service, error) {
	err := view.Register(views...)
	if err != nil {
		return nil, err
	}

	if !metadata.OnGCE() {
		view.SetReportingPeriod(5 * time.Second)
		pe, err := prometheus.NewExporter(prometheus.Options{})
		if err != nil {
			return nil, fmt.Errorf("prometheus.NewExporter: %w", err)
		}
		view.RegisterExporter(pe)
		return &Service{pExporter: pe}, nil
	}

	projID, err := metadata.ProjectID()
	if err != nil {
		return nil, err
	}
	if resource == nil {
		return nil, errors.New("resource is required, got nil")
	}
	sde, err := stackdriver.NewExporter(stackdriver.Options{
		ProjectID:         projID,
		MonitoredResource: resource,
		ReportingInterval: time.Minute, // Minimum interval for Stackdriver is 1 minute.
	})
	if err != nil {
		return nil, err
	}

	// Minimum interval for Stackdriver is 1 minute.
	view.SetReportingPeriod(time.Minute)
	// Start the metrics exporter.
	if err := sde.StartMetricsExporter(); err != nil {
		return nil, err
	}

	return &Service{sdExporter: sde}, nil
}