113 lines
2.6 KiB
Go
113 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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"reflect"
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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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// DefaultMetricPrefix holds the string that prepends to all metrics
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DefaultMetricPrefix = "micro_"
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// DefaultLabelPrefix holds the string that prepends to all labels
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DefaultLabelPrefix = "micro_"
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// DefaultSummaryQuantiles is the default spread of stats for summary
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DefaultSummaryQuantiles = []float64{0.5, 0.9, 0.97, 0.99, 1}
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// DefaultSummaryWindow is the default window for summary
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DefaultSummaryWindow = 5 * time.Minute
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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(opts ...Option) error
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Counter(name string, labels ...string) Counter
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FloatCounter(name string, labels ...string) FloatCounter
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Gauge(name string, fn func() float64, labels ...string) Gauge
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Set(opts ...Option) Meter
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Histogram(name string, labels ...string) Histogram
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Summary(name string, labels ...string) Summary
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SummaryExt(name string, window time.Duration, quantiles []float64, labels ...string) Summary
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Write(w io.Writer, opts ...Option) 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 byKey []string
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func (k byKey) Len() int { return len(k) / 2 }
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func (k byKey) Less(i, j int) bool { return k[i*2] < k[j*2] }
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func (k byKey) Swap(i, j int) {
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k[i*2], k[i*2+1], k[j*2], k[j*2+1] = k[j*2], k[j*2+1], k[i*2], k[i*2+1]
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}
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func Sort(slice *[]string) {
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bk := byKey(*slice)
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if bk.Len() <= 1 {
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return
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}
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sort.Sort(bk)
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v := reflect.ValueOf(slice).Elem()
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cnt := 0
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key := 0
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val := 1
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for key < v.Len() {
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if len(bk) > key+2 && bk[key] == bk[key+2] {
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key += 2
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val += 2
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continue
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}
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v.Index(cnt).Set(v.Index(key))
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cnt++
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v.Index(cnt).Set(v.Index(val))
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cnt++
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key += 2
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val += 2
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}
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v.SetLen(cnt)
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}
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