meter: disable auto sorting labels
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
This commit is contained in:
@@ -4,8 +4,8 @@ package meter
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import (
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"io"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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@@ -117,6 +117,39 @@ func BuildLabels(labels ...string) []string {
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return labels
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}
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var spool = newStringsPool(500)
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type stringsPool struct {
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p *sync.Pool
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c int
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}
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func newStringsPool(size int) *stringsPool {
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p := &stringsPool{c: size}
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p.p = &sync.Pool{
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New: func() interface{} {
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return &strings.Builder{}
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},
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}
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return p
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}
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func (p *stringsPool) Cap() int {
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return p.c
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}
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func (p *stringsPool) Get() *strings.Builder {
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return p.p.Get().(*strings.Builder)
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}
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func (p *stringsPool) Put(b *strings.Builder) {
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if b.Cap() > p.c {
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return
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}
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b.Reset()
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p.p.Put(b)
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}
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// BuildName used to combine metric with labels.
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// If labels count is odd, drop last element
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func BuildName(name string, labels ...string) string {
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@@ -125,8 +158,6 @@ func BuildName(name string, labels ...string) string {
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}
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if len(labels) > 2 {
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sort.Sort(byKey(labels))
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idx := 0
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for {
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if labels[idx] == labels[idx+2] {
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@@ -141,7 +172,9 @@ func BuildName(name string, labels ...string) string {
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}
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}
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var b strings.Builder
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b := spool.Get()
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defer spool.Put(b)
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_, _ = b.WriteString(name)
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_, _ = b.WriteRune('{')
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for idx := 0; idx < len(labels); idx += 2 {
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@@ -149,8 +182,9 @@ func BuildName(name string, labels ...string) string {
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_, _ = b.WriteRune(',')
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}
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_, _ = b.WriteString(labels[idx])
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_, _ = b.WriteString(`=`)
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_, _ = b.WriteString(strconv.Quote(labels[idx+1]))
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_, _ = b.WriteString(`="`)
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_, _ = b.WriteString(labels[idx+1])
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_, _ = b.WriteRune('"')
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}
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_, _ = b.WriteRune('}')
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