48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
package metrics
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import (
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"time"
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"github.com/prometheus/client_golang/prometheus"
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)
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// Timer assumes the metrics is partitioned by one label
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type Timer struct {
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startTime map[string]time.Time
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metrics *prometheus.HistogramVec
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measureUnit time.Duration
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labelKey string
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}
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func NewTimer(metrics *prometheus.HistogramVec, unit time.Duration, labelKey string) *Timer {
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return &Timer{
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startTime: make(map[string]time.Time),
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measureUnit: unit,
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metrics: metrics,
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labelKey: labelKey,
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}
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}
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func (i *Timer) Start(labelVal string) {
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i.startTime[labelVal] = time.Now()
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}
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func (i *Timer) End(labelVal string) time.Duration {
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if start, ok := i.startTime[labelVal]; ok {
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return Latency(start, time.Now())
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}
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return 0
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}
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func (i *Timer) Observe(measurement time.Duration, labelVal string) {
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metricsLabels := prometheus.Labels{i.labelKey: labelVal}
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i.metrics.With(metricsLabels).Observe(float64(measurement / i.measureUnit))
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}
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func (i *Timer) EndAndObserve(labelVal string) {
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i.Observe(i.End(labelVal), labelVal)
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}
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func Latency(startTime, endTime time.Time) time.Duration {
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return endTime.Sub(startTime)
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}
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