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types.go
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/
types.go
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package otel
import (
"context"
"strings"
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/generic"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric"
sdk "go.opentelemetry.io/otel/sdk/metric"
xmetrics "github.com/heroku/x/go-kit/metrics"
)
var (
_ metrics.Counter = (*Counter)(nil)
_ metrics.Gauge = (*Gauge)(nil)
_ metrics.Histogram = (*Histogram)(nil)
)
// Counter is a counter.
type Counter struct {
metric.Float64Counter
name string
labels []string
attributes attribute.Set
p *Provider
}
// Add implements metrics.Counter.
func (c *Counter) Add(delta float64) {
c.Float64Counter.Add(c.p.cfg.ctx, delta, metric.WithAttributeSet(c.attributes))
}
// With implements metrics.Counter.
func (c *Counter) With(labelValues ...string) metrics.Counter {
lvs := append(append([]string(nil), c.labels...), labelValues...)
return c.p.newCounter(c.name, lvs...)
}
// NewCounter creates a new Counter.
func (p *Provider) NewCounter(name string) metrics.Counter {
return p.newCounter(prefixName(p.cfg.prefix, name))
}
func (p *Provider) newCounter(name string, labelValues ...string) metrics.Counter {
p.mu.Lock()
defer p.mu.Unlock()
k := keyName(name, labelValues...)
m := p.meterProvider.Meter(name)
if _, ok := p.counters[k]; !ok {
c, _ := m.Float64Counter(name)
p.counters[k] = &Counter{
Float64Counter: c,
labels: labelValues,
attributes: makeAttributes(labelValues),
p: p,
name: name,
}
}
return p.counters[k]
}
// Gauge is a gauge.
type Gauge struct {
*generic.Gauge
observer metric.Float64Observable
name string
labels []string
attributes attribute.Set
p *Provider
}
// NewGauge implements metrics.Provider.
func (p *Provider) NewGauge(name string) metrics.Gauge {
return p.newGauge(prefixName(p.cfg.prefix, name))
}
func (p *Provider) newGauge(name string, labelValues ...string) metrics.Gauge {
p.mu.Lock()
defer p.mu.Unlock()
k := keyName(name, labelValues...)
m := p.meterProvider.Meter(name)
attributes := makeAttributes(labelValues)
if _, ok := p.gauges[k]; !ok {
gg := generic.NewGauge(name)
callback := func(_ context.Context, result metric.Float64Observer) error {
result.Observe(gg.Value(), metric.WithAttributeSet(attributes))
return nil
}
g, _ := m.Float64ObservableGauge(name, metric.WithFloat64Callback(callback))
p.gauges[k] = &Gauge{
Gauge: gg,
observer: g,
labels: labelValues,
attributes: attributes,
name: name,
p: p,
}
}
return p.gauges[k]
}
// With implements metrics.Gauge.
func (g *Gauge) With(labelValues ...string) metrics.Gauge {
lvs := append(append([]string(nil), g.labels...), labelValues...)
return g.p.newGauge(g.name, lvs...)
}
// Set implements metrics.Gauge.
func (g *Gauge) Set(value float64) {
g.Gauge.Set(value)
}
// Add implements metrics.Gauge.
func (g *Gauge) Add(delta float64) {
g.Gauge.Add(delta)
}
// Histogram is a histogram.
type Histogram struct {
metric.Float64Histogram
stream sdk.Stream
labels []string
attributes attribute.Set
p *Provider
}
func (p *Provider) NewExplicitHistogram(name string, fn xmetrics.DistributionFunc) metrics.Histogram {
stream := sdk.Stream{
Name: prefixName(p.cfg.prefix, name),
Aggregation: sdk.AggregationExplicitBucketHistogram{
Boundaries: fn(),
},
}
return p.newHistogram(stream)
}
// NewHistogram implements metrics.Provider.
func (p *Provider) NewHistogram(name string, buckets int) metrics.Histogram {
if buckets <= 0 {
buckets = defaultExponentialHistogramMaxSize
}
stream := sdk.Stream{
Name: prefixName(p.cfg.prefix, name),
Aggregation: sdk.AggregationBase2ExponentialHistogram{
MaxSize: int32(buckets),
MaxScale: defaultExponentialHistogramMaxScale,
},
}
return p.newHistogram(stream)
}
func (p *Provider) newHistogram(stream sdk.Stream, labelValues ...string) metrics.Histogram {
p.mu.Lock()
defer p.mu.Unlock()
name := stream.Name
k := keyName(name, labelValues...)
m := p.meterProvider.Meter(name)
if _, ok := p.histograms[k]; !ok {
h, _ := m.Float64Histogram(name)
p.viewCache.Store(stream)
p.histograms[k] = &Histogram{
Float64Histogram: h,
stream: stream,
labels: labelValues,
attributes: makeAttributes(labelValues),
p: p,
}
}
return p.histograms[k]
}
// With implements metrics.Histogram.
func (h *Histogram) With(labelValues ...string) metrics.Histogram {
lvs := append(append([]string(nil), h.labels...), labelValues...)
return h.p.newHistogram(h.stream, lvs...)
}
// Observe implements metrics.Histogram.
func (h *Histogram) Observe(value float64) {
h.Record(h.p.cfg.ctx, value, metric.WithAttributeSet(h.attributes))
}
// NewCardinalityCounter implements metrics.Provider.
func (p *Provider) NewCardinalityCounter(name string) xmetrics.CardinalityCounter {
return xmetrics.NewHLLCounter(name)
}
func prefixName(prefix, name string) string {
if prefix == "" {
return name
}
return prefix + "." + name
}
// keyName is used as the map key for counters, gauges, and histograms
// and incorporates the name and the labelValues.
func keyName(name string, labelValues ...string) string {
if len(labelValues) == 0 {
return name
}
l := len(labelValues)
parts := make([]string, 0, l/2)
for i := 0; i < l; i += 2 {
parts = append(parts, labelValues[i]+":"+labelValues[i+1])
}
return name + "." + strings.Join(parts, ".")
}
// makeAttributes is used to convert labels into attribute.KeyValues.
func makeAttributes(labels []string) attribute.Set {
attributes := make([]attribute.KeyValue, len(labels))
if len(labels)%2 != 0 {
labels = append(labels, "unknown")
}
for i := 0; i < len(labels); i += 2 {
attributes = append(attributes, attribute.String(labels[i], labels[i+1]))
}
return attribute.NewSet(attributes...)
}