Method metricMetadata

web/api/v1/api.go:1465–1536

(r *http.Request)

}

func (api *API) metricMetadata(r *http.Request) apiFuncResult {
	metrics := map[string]map[metadata.Metadata]struct{}{}

	limit := -1
	if s := r.FormValue("limit"); s != "" {
		var err error
		if limit, err = strconv.Atoi(s); err != nil {
			return apiFuncResult{nil, &apiError{errorBadData, errors.New("limit must be a number")}, nil, nil}
		}
	}
	limitPerMetric := -1
	if s := r.FormValue("limit_per_metric"); s != "" {
		var err error
		if limitPerMetric, err = strconv.Atoi(s); err != nil {
			return apiFuncResult{nil, &apiError{errorBadData, errors.New("limit_per_metric must be a number")}, nil, nil}
		}
	}

	metric := r.FormValue("metric")
	for _, tt := range api.targetRetriever(r.Context()).TargetsActive() {
		for _, t := range tt {
			if metric == "" {
				for _, mm := range t.ListMetadata() {
					m := metadata.Metadata{Type: mm.Type, Help: mm.Help, Unit: mm.Unit}
					ms, ok := metrics[mm.MetricFamily]

					if limitPerMetric > 0 && len(ms) >= limitPerMetric {
						continue
					}

					if !ok {
						ms = map[metadata.Metadata]struct{}{}
						metrics[mm.MetricFamily] = ms
					}
					ms[m] = struct{}{}
				}
				continue
			}

			if md, ok := t.GetMetadata(metric); ok {
				m := metadata.Metadata{Type: md.Type, Help: md.Help, Unit: md.Unit}
				ms, ok := metrics[md.MetricFamily]

				if limitPerMetric > 0 && len(ms) >= limitPerMetric {
					continue
				}

				if !ok {
					ms = map[metadata.Metadata]struct{}{}
					metrics[md.MetricFamily] = ms
				}
				ms[m] = struct{}{}
			}
		}
	}

	// Put the elements from the pseudo-set into a slice for marshaling.
	res := map[string][]metadata.Metadata{}