func initCoreComponents()

in api/init.go [84:138]
46 lines of code
12 McCabe index (conditional complexity)

func initCoreComponents() error {
	if config.MetricLogFlushIntervalSec() > 0 {
		if err := metric.InitTask(); err != nil {
			return err
		}
	}

	systemStatInterval := config.SystemStatCollectIntervalMs()
	loadStatInterval := systemStatInterval
	cpuStatInterval := systemStatInterval
	memStatInterval := systemStatInterval

	if config.LoadStatCollectIntervalMs() > 0 {
		loadStatInterval = config.LoadStatCollectIntervalMs()
	}
	if config.CpuStatCollectIntervalMs() > 0 {
		cpuStatInterval = config.CpuStatCollectIntervalMs()
	}
	if config.MemoryStatCollectIntervalMs() > 0 {
		memStatInterval = config.MemoryStatCollectIntervalMs()
	}

	if loadStatInterval > 0 {
		system_metric.InitLoadCollector(loadStatInterval)
	}
	if cpuStatInterval > 0 {
		system_metric.InitCpuCollector(cpuStatInterval)
	}
	if memStatInterval > 0 {
		system_metric.InitMemoryCollector(memStatInterval)
	}

	if config.UseCacheTime() {
		util.StartTimeTicker()
	}

	if config.MetricExportHTTPAddr() != "" {
		httpAddr := config.MetricExportHTTPAddr()
		httpPath := config.MetricExportHTTPPath()

		l, err := net.Listen("tcp", httpAddr)
		if err != nil {
			return fmt.Errorf("init metric exporter http server err: %s", err.Error())
		}

		http.Handle(httpPath, metric_exporter.HTTPHandler())
		go func() {
			_ = http.Serve(l, nil)
		}()

		return nil
	}

	return nil
}