forked from TrueCloudLab/distribution
e3c37a46e2
at the first iteration, only the following metrics are collected:
- HTTP metrics of each API endpoint
- cache counter for request/hit/miss
- histogram of storage actions, including:
GetContent, PutContent, Stat, List, Move, and Delete
Signed-off-by: tifayuki <tifayuki@gmail.com>
85 lines
2.2 KiB
Go
85 lines
2.2 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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// StartTimer begins a timer observation at the callsite. When the target
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// operation is completed, the caller should call the return done func().
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func StartTimer(timer Timer) (done func()) {
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start := time.Now()
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return func() {
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timer.Update(time.Since(start))
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}
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}
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// Timer is a metric that allows collecting the duration of an action in seconds
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type Timer interface {
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// Update records an observation, duration, and converts to the target
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// units.
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Update(duration time.Duration)
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// UpdateSince will add the duration from the provided starting time to the
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// timer's summary with the precisions that was used in creation of the timer
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UpdateSince(time.Time)
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}
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// LabeledTimer is a timer that must have label values populated before use.
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type LabeledTimer interface {
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WithValues(labels ...string) *labeledTimerObserver
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}
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type labeledTimer struct {
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m *prometheus.HistogramVec
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}
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type labeledTimerObserver struct {
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m prometheus.Observer
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}
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func (lbo *labeledTimerObserver) Update(duration time.Duration) {
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lbo.m.Observe(duration.Seconds())
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}
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func (lbo *labeledTimerObserver) UpdateSince(since time.Time) {
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lbo.m.Observe(time.Since(since).Seconds())
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}
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func (lt *labeledTimer) WithValues(labels ...string) *labeledTimerObserver {
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return &labeledTimerObserver{m: lt.m.WithLabelValues(labels...)}
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}
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func (lt *labeledTimer) Describe(c chan<- *prometheus.Desc) {
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lt.m.Describe(c)
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}
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func (lt *labeledTimer) Collect(c chan<- prometheus.Metric) {
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lt.m.Collect(c)
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}
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type timer struct {
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m prometheus.Observer
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}
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func (t *timer) Update(duration time.Duration) {
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t.m.Observe(duration.Seconds())
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}
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func (t *timer) UpdateSince(since time.Time) {
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t.m.Observe(time.Since(since).Seconds())
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}
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func (t *timer) Describe(c chan<- *prometheus.Desc) {
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c <- t.m.(prometheus.Metric).Desc()
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}
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func (t *timer) Collect(c chan<- prometheus.Metric) {
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// Are there any observers that don't implement Collector? It is really
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// unclear what the point of the upstream change was, but we'll let this
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// panic if we get an observer that doesn't implement collector. In this
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// case, we should almost always see metricVec objects, so this should
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// never panic.
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t.m.(prometheus.Collector).Collect(c)
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}
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