Method labelValues

web/api/v1/api.go:852–948

(r *http.Request)

}

func (api *API) labelValues(r *http.Request) (result apiFuncResult) {
	ctx := r.Context()
	name := route.Param(ctx, "name")

	if strings.HasPrefix(name, "U__") {
		name = model.UnescapeName(name, model.ValueEncodingEscaping)
	}

	if !model.UTF8Validation.IsValidLabelName(name) {
		return apiFuncResult{nil, &apiError{errorBadData, fmt.Errorf("invalid label name: %q", name)}, nil, nil}
	}

	limit, err := parseLimitParam(r.FormValue("limit"))
	if err != nil {
		return invalidParamError(err, "limit")
	}

	start, err := parseTimeParam(r, "start", MinTime)
	if err != nil {
		return invalidParamError(err, "start")
	}
	end, err := parseTimeParam(r, "end", MaxTime)
	if err != nil {
		return invalidParamError(err, "end")
	}

	matcherSets, err := api.parseMatchersParam(r.Form["match[]"])
	if err != nil {
		return apiFuncResult{nil, &apiError{errorBadData, err}, nil, nil}
	}

	hints := &storage.LabelHints{
		Limit: toHintLimit(limit),
	}

	q, err := api.Queryable.Querier(timestamp.FromTime(start), timestamp.FromTime(end))
	if err != nil {
		return apiFuncResult{nil, &apiError{errorExec, err}, nil, nil}
	}
	// From now on, we must only return with a finalizer in the result (to
	// be called by the caller) or call q.Close ourselves (which is required
	// in the case of a panic).
	defer func() {
		if result.finalizer == nil {
			q.Close()
		}
	}()
	closer := func() {
		q.Close()
	}

	var (
		vals     []string
		warnings annotations.Annotations
	)
	if len(matcherSets) > 1 {
		var callWarnings annotations.Annotations
		labelValuesSet := make(map[string]struct{})