Method GetDatum

internal/metrics/metric.go:151–181

GetDatum returns the datum named by a sequence of string label values from a Metric. If the sequence of label values does not yet exist, it is created.

(labelvalues ...string)

// GetDatum returns the datum named by a sequence of string label values from a
// Metric.  If the sequence of label values does not yet exist, it is created.
func (m *Metric) GetDatum(labelvalues ...string) (d datum.Datum, err error) {
	if len(labelvalues) != len(m.Keys) {
		return nil, errors.Errorf("Label values requested (%q) not same length as keys for metric %v", labelvalues, m)
	}
	m.Lock()
	defer m.Unlock()
	if lv := m.FindLabelValueOrNil(labelvalues); lv != nil {
		d = lv.Value
	} else {
		// TODO Check m.Limit and expire old data
		switch m.Type {
		case Int:
			d = datum.NewInt()
		case Float:
			d = datum.NewFloat()
		case String:
			d = datum.NewString()
		case Buckets:
			buckets := m.Buckets
			if buckets == nil {
				buckets = make([]datum.Range, 0)
			}
			d = datum.NewBuckets(buckets)
		}
		lv := &LabelValue{Labels: labelvalues, Value: d}
		if err := m.AppendLabelValue(lv); err != nil {
			return nil, err
		}
	}
	return d, nil
}

// RemoveOldestDatum scans the Metric's LabelValues for the Datum with the oldest timestamp, and removes it.
func (m *Metric) RemoveOldestDatum() {