func (a *API) FetchMetricCluster(cid CIDType, extras string) (*MetricCluster, error) {
	if cid == nil || *cid == "" {
		return nil, fmt.Errorf("Invalid metric cluster CID [none]")
	}

	clusterCID := string(*cid)

	matched, err := regexp.MatchString(config.MetricClusterCIDRegex, clusterCID)
	if err != nil {
		return nil, err
	}
	if !matched {
		return nil, fmt.Errorf("Invalid metric cluster CID [%s]", clusterCID)
	}

	reqURL := url.URL{
		Path: clusterCID,
	}

	extra := ""
	switch extras {
	case "metrics":
		extra = "_matching_metrics"
	case "uuids":
		extra = "_matching_uuid_metrics"
	}

	if extra != "" {
		q := url.Values{}
		q.Set("extra", extra)
		reqURL.RawQuery = q.Encode()
	}

	result, err := a.Get(reqURL.String())
	if err != nil {
		return nil, err
	}

	if a.Debug {
		a.Log.Printf("[DEBUG] fetch metric cluster, received JSON: %s", string(result))
	}

	cluster := &MetricCluster{}
	if err := json.Unmarshal(result, cluster); err != nil {
		return nil, err
	}

	return cluster, nil
}
func (a *API) FetchMetricCluster(cid CIDType, extras string) (*MetricCluster, error) {
	if cid == nil || *cid == "" {
		return nil, fmt.Errorf("Invalid metric cluster CID [none]")
	}

	clusterCID := string(*cid)

	matched, err := regexp.MatchString(config.MetricClusterCIDRegex, clusterCID)
	if err != nil {
		return nil, err
	}
	if !matched {
		return nil, fmt.Errorf("Invalid metric cluster CID [%s]", clusterCID)
	}

	reqURL := url.URL{
		Path: clusterCID,
	}

	extra := ""
	switch extras {
	case "metrics":
		extra = "_matching_metrics"
	case "uuids":
		extra = "_matching_uuid_metrics"
	}

	if extra != "" {
		q := url.Values{}
		q.Set("extra", extra)
		reqURL.RawQuery = q.Encode()
	}

	result, err := a.Get(reqURL.String())
	if err != nil {
		return nil, err
	}

	if a.Debug {
		a.Log.Printf("[DEBUG] fetch metric cluster, received JSON: %s", string(result))
	}

	cluster := &MetricCluster{}
	if err := json.Unmarshal(result, cluster); err != nil {
		return nil, err
	}

	return cluster, nil
}
// FetchMetricCluster retrieves metric cluster with passed cid.