func main()

in cmd/datasource-syncer/main.go [61:167]
83 lines of code
17 McCabe index (conditional complexity)

func main() {
	flag.Parse()

	logger := log.NewJSONLogger(log.NewSyncWriter(os.Stderr))
	logger = log.With(logger, "ts", log.DefaultTimestampUTC)
	logger = log.With(logger, "caller", log.DefaultCaller)

	if !fips140.Enabled() {
		_ = logger.Log("msg", "FIPS mode not enabled")
		os.Exit(1)
	}

	if len(*datasourceUIDList) == 0 {
		//nolint:errcheck
		level.Error(logger).Log("msg", "--datasource-uid must be set")
		os.Exit(1)
	}

	if *grafanaAPIToken == "" {
		envToken := os.Getenv("GRAFANA_SERVICE_ACCOUNT_TOKEN")
		if envToken == "" {
			//nolint:errcheck
			level.Error(logger).Log("msg", "--grafana-api-token or the environment variable GRAFANA_SERVICE_ACCOUNT_TOKEN must be set")
			os.Exit(1)
		}
		grafanaAPIToken = &envToken
	}
	if *grafanaEndpoint == "" {
		//nolint:errcheck
		level.Error(logger).Log("msg", "--grafana-api-endpoint must be set")
		os.Exit(1)
	}

	if *projectID == "" {
		//nolint:errcheck
		level.Error(logger).Log("msg", "--project-id must be set")
		os.Exit(1)
	}

	client, err := getTLSClient(*certFile, *keyFile, *caFile, *insecureSkipVerify)
	if err != nil {
		//nolint:errcheck
		level.Error(logger).Log("msg", "couldn't create client", "err", err)
		os.Exit(1)
	}

	grafanaClient, err := grafana.New(*grafanaEndpoint, grafana.Config{
		APIKey: *grafanaAPIToken,
		Client: client,
	})
	if err != nil {
		//nolint:errcheck
		level.Error(logger).Log("msg", "couldn't create grafana client", "err", err)
		os.Exit(1)
	}

	token, err := getOAuth2Token(*credentialsFile)
	if err != nil {
		//nolint:errcheck
		level.Error(logger).Log("msg", "couldn't get Google OAuth2 token", "err", err)
		os.Exit(1)
	}

	dsSuccessfullyUpdated := []string{}
	dsErrors := []string{}
	datasourceUIDs := strings.Split(*datasourceUIDList, ",")
	for _, datasourceUID := range datasourceUIDs {
		datasourceUID = strings.TrimSpace(datasourceUID)
		if datasourceUID == "" {
			continue
		}

		dataSource, err := grafanaClient.DataSourceByUID(datasourceUID)
		if err != nil {
			dsErrors = append(dsErrors, datasourceUID)
			//nolint:errcheck
			level.Error(logger).Log("msg", fmt.Sprintf("error fetching data source config of data source uid: %s", datasourceUID), "err", err)
			continue
		}

		dataSource, err = buildUpdateDataSourceRequest(*dataSource, token)
		if err != nil {
			dsErrors = append(dsErrors, datasourceUID)
			//nolint:errcheck
			level.Error(logger).Log("msg", fmt.Sprintf("couldn't build data source update request for data source uid: %s", datasourceUID), "err", err)
			continue
		}

		err = grafanaClient.UpdateDataSourceByUID(dataSource)
		if err != nil {
			dsErrors = append(dsErrors, datasourceUID)
			//nolint:errcheck
			level.Error(logger).Log("msg", fmt.Sprintf("couldn't send update data source request to data source id: %s", datasourceUID), "err", err)
			continue
		}
		dsSuccessfullyUpdated = append(dsSuccessfullyUpdated, datasourceUID)
	}
	if len(dsSuccessfullyUpdated) != 0 {
		//nolint:errcheck
		level.Info(logger).Log("msg", fmt.Sprintf("Updated Grafana data source uids: %s", dsSuccessfullyUpdated))
	}
	if len(dsErrors) != 0 {
		//nolint:errcheck
		level.Error(logger).Log("msg", fmt.Sprintf("Failed to update Grafana data source uids: %s", dsErrors))
		os.Exit(1)
	}
}