91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
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package telemetry
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import (
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"fmt"
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"io"
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"sort"
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"sync"
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"sync/atomic"
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)
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// Counter 单调递增的累计指标(整数语义,内部用 float64 位以 atomic 操作)。
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type Counter struct {
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metricName string
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help string
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labelNames []string
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mu sync.RWMutex
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values map[string]*counterChild // key = labelKey(...)
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}
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type counterChild struct {
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labels Labels
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bits atomic.Uint64 // float64
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}
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func newCounter(name, help string, labelNames []string) *Counter {
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return &Counter{
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metricName: name,
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help: help,
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labelNames: append([]string(nil), labelNames...),
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values: make(map[string]*counterChild),
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}
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}
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// Inc 计数 +1。
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func (c *Counter) Inc(labels Labels) { c.Add(1, labels) }
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// Add 累加 v(v 必须 >= 0)。
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func (c *Counter) Add(v float64, labels Labels) {
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if v < 0 {
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return
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}
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child := c.getOrCreate(labels)
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for {
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bits := child.bits.Load()
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cur := float64frombits(bits)
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next := float64bits(cur + v)
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if child.bits.CompareAndSwap(bits, next) {
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return
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}
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}
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}
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func (c *Counter) getOrCreate(labels Labels) *counterChild {
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key := labelKey(c.labelNames, labels)
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c.mu.RLock()
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if child, ok := c.values[key]; ok {
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c.mu.RUnlock()
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return child
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}
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c.mu.RUnlock()
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c.mu.Lock()
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defer c.mu.Unlock()
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if child, ok := c.values[key]; ok {
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return child
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}
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child := &counterChild{labels: copyLabels(labels, c.labelNames)}
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c.values[key] = child
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return child
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}
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func (c *Counter) collect(w io.Writer) {
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fmt.Fprintf(w, "# HELP %s %s\n", c.metricName, c.help)
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fmt.Fprintf(w, "# TYPE %s counter\n", c.metricName)
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c.mu.RLock()
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keys := make([]string, 0, len(c.values))
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for k := range c.values {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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defer c.mu.RUnlock()
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for _, k := range keys {
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child := c.values[k]
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val := float64frombits(child.bits.Load())
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writeMetricLine(w, c.metricName, child.labels, val)
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}
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}
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