func main()

in alertmanager/server.go [32:74]
36 lines of code
3 McCabe index (conditional complexity)

func main() {
	port := flag.String("port", defaultPort, fmt.Sprintf("Port to listen for requests. Default is %s", defaultPort))
	alertmanagerConfPath := flag.String("alertmanager-conf", defaultAlertmanagerConfigPath, fmt.Sprintf("Path to alertmanager configuration file. Default is %s", defaultAlertmanagerConfigPath))
	alertmanagerURL := flag.String("alertmanagerURL", defaultAlertmanagerURL, fmt.Sprintf("URL of the alertmanager instance that is being used. Default is %s", defaultAlertmanagerURL))
	matcherLabel := flag.String("multitenant-label", "", "LabelName to use for enabling multitenancy through route matching. Leave empty for single tenant use cases.")
	templateDirPath := flag.String("template-directory", defaultTemplateDir, fmt.Sprintf("Directory where template files are stored. Default is %s", defaultTemplateDir))
	deleteRoutesByDefault := flag.Bool("delete-route-with-receiver", false, fmt.Sprintf("When a receiver is deleted, also delete all references in the route tree. Otherwise deleting before modifying tree will throw error."))
	flag.Parse()

	if !strings.HasSuffix(*templateDirPath, "/") {
		*templateDirPath += "/"
	}

	tenancy := &alert.TenancyConfig{
		RestrictorLabel: *matcherLabel,
	}

	e := echo.New()
	e.Use(middleware.CORS())
	e.Use(middleware.Logger())

	fileLocks, err := alert.NewFileLocker(alert.NewDirectoryClient(*templateDirPath))
	if err != nil {
		panic(fmt.Errorf("error configuring file configmanager: %v", err))
	}

	config := client.ClientConfig{
		ConfigPath:      *alertmanagerConfPath,
		AlertmanagerURL: *alertmanagerURL,
		FsClient:        fsclient.NewFSClient("/"),
		Tenancy:         tenancy,
		DeleteRoutes:    *deleteRoutesByDefault,
	}
	receiverClient := client.NewClient(config)
	templateClient := client.NewTemplateClient(fsclient.NewFSClient(*templateDirPath), fileLocks)

	handlers.RegisterBaseHandlers(e)
	handlers.RegisterV0Handlers(e, receiverClient)
	handlers.RegisterV1Handlers(e, receiverClient, templateClient)

	glog.Infof("Alertmanager Config server listening on port: %s\n", *port)
	e.Logger.Fatal(e.Start(fmt.Sprintf(":%s", *port)))
}