128 lines
2.6 KiB
Go
128 lines
2.6 KiB
Go
// Package meter is for instrumentation
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package meter
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import (
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"io"
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"sort"
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"time"
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)
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var (
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// DefaultMeter is the default meter
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DefaultMeter Meter = NewMeter()
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// DefaultAddress data will be made available on this host:port
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DefaultAddress = ":9090"
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// DefaultPath the meter endpoint where the Meter data will be made available
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DefaultPath = "/metrics"
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// timingObjectives is the default spread of stats we maintain for timings / histograms:
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//defaultTimingObjectives = map[float64]float64{0.0: 0, 0.5: 0.05, 0.75: 0.04, 0.90: 0.03, 0.95: 0.02, 0.98: 0.001, 1: 0}
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// default metric prefix
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DefaultMetricPrefix = "micro_"
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// default label prefix
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DefaultLabelPrefix = "micro_"
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)
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// Meter is an interface for collecting and instrumenting metrics
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type Meter interface {
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Name() string
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Init(...Option) error
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Counter(string, ...Option) Counter
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FloatCounter(string, ...Option) FloatCounter
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Gauge(string, func() float64, ...Option) Gauge
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Set(...Option) Meter
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Histogram(string, ...Option) Histogram
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Summary(string, ...Option) Summary
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SummaryExt(string, time.Duration, []float64, ...Option) Summary
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Write(io.Writer, bool) error
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Options() Options
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String() string
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}
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// Counter is a counter
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type Counter interface {
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Add(int)
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Dec()
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Get() uint64
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Inc()
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Set(uint64)
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}
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// FloatCounter is a float64 counter
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type FloatCounter interface {
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Add(float64)
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Get() float64
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Set(float64)
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Sub(float64)
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}
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// Gauge is a float64 gauge
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type Gauge interface {
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Get() float64
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}
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// Histogram is a histogram for non-negative values with automatically created buckets
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type Histogram interface {
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Reset()
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Update(float64)
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UpdateDuration(time.Time)
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// VisitNonZeroBuckets(f func(vmrange string, count uint64))
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}
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// Summary is the summary
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type Summary interface {
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Update(float64)
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UpdateDuration(time.Time)
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}
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type Labels struct {
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keys []string
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vals []string
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}
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func (ls Labels) Len() int {
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return len(ls.keys)
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}
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func (ls Labels) Swap(i, j int) {
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ls.keys[i], ls.keys[j] = ls.keys[j], ls.keys[i]
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ls.vals[i], ls.vals[j] = ls.vals[j], ls.vals[i]
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}
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func (ls Labels) Less(i, j int) bool {
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return ls.vals[i] < ls.vals[j]
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}
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func (ls Labels) Sort() {
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sort.Sort(ls)
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}
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func (ls Labels) Append(nls Labels) Labels {
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for n := range nls.keys {
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ls.keys = append(ls.keys, nls.keys[n])
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ls.vals = append(ls.vals, nls.vals[n])
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}
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return ls
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}
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type LabelIter struct {
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labels Labels
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cnt int
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cur int
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}
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func (ls Labels) Iter() *LabelIter {
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ls.Sort()
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return &LabelIter{labels: ls, cnt: len(ls.keys)}
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}
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func (iter *LabelIter) Next(k, v *string) bool {
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if iter.cur+1 > iter.cnt {
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return false
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}
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*k = iter.labels.keys[iter.cur]
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*v = iter.labels.vals[iter.cur]
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iter.cur++
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return true
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}
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