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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package global // import "go.opentelemetry.io/otel/internal/global"
import (
"context"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/metric/embedded"
)
type testMeterProvider struct {
embedded.MeterProvider
count int
}
func (p *testMeterProvider) Meter(name string, opts ...metric.MeterOption) metric.Meter {
p.count++
return &testMeter{}
}
type testMeter struct {
embedded.Meter
afCount int
afUDCount int
afGauge int
aiCount int
aiUDCount int
aiGauge int
sfCount int
sfUDCount int
sfHist int
sfGauge int
siCount int
siUDCount int
siHist int
siGauge int
callbacks []metric.Callback
}
func (m *testMeter) Int64Counter(name string, options ...metric.Int64CounterOption) (metric.Int64Counter, error) {
m.siCount++
return &testCountingIntInstrument{}, nil
}
func (m *testMeter) Int64UpDownCounter(name string, options ...metric.Int64UpDownCounterOption) (metric.Int64UpDownCounter, error) {
m.siUDCount++
return &testCountingIntInstrument{}, nil
}
func (m *testMeter) Int64Histogram(name string, options ...metric.Int64HistogramOption) (metric.Int64Histogram, error) {
m.siHist++
return &testCountingIntInstrument{}, nil
}
func (m *testMeter) Int64Gauge(name string, options ...metric.Int64GaugeOption) (metric.Int64Gauge, error) {
m.siGauge++
return &testCountingIntInstrument{}, nil
}
func (m *testMeter) Int64ObservableCounter(name string, options ...metric.Int64ObservableCounterOption) (metric.Int64ObservableCounter, error) {
m.aiCount++
return &testCountingIntInstrument{}, nil
}
func (m *testMeter) Int64ObservableUpDownCounter(name string, options ...metric.Int64ObservableUpDownCounterOption) (metric.Int64ObservableUpDownCounter, error) {
m.aiUDCount++
return &testCountingIntInstrument{}, nil
}
func (m *testMeter) Int64ObservableGauge(name string, options ...metric.Int64ObservableGaugeOption) (metric.Int64ObservableGauge, error) {
m.aiGauge++
return &testCountingIntInstrument{}, nil
}
func (m *testMeter) Float64Counter(name string, options ...metric.Float64CounterOption) (metric.Float64Counter, error) {
m.sfCount++
return &testCountingFloatInstrument{}, nil
}
func (m *testMeter) Float64UpDownCounter(name string, options ...metric.Float64UpDownCounterOption) (metric.Float64UpDownCounter, error) {
m.sfUDCount++
return &testCountingFloatInstrument{}, nil
}
func (m *testMeter) Float64Histogram(name string, options ...metric.Float64HistogramOption) (metric.Float64Histogram, error) {
m.sfHist++
return &testCountingFloatInstrument{}, nil
}
func (m *testMeter) Float64Gauge(name string, options ...metric.Float64GaugeOption) (metric.Float64Gauge, error) {
m.sfGauge++
return &testCountingFloatInstrument{}, nil
}
func (m *testMeter) Float64ObservableCounter(name string, options ...metric.Float64ObservableCounterOption) (metric.Float64ObservableCounter, error) {
m.afCount++
return &testCountingFloatInstrument{}, nil
}
func (m *testMeter) Float64ObservableUpDownCounter(name string, options ...metric.Float64ObservableUpDownCounterOption) (metric.Float64ObservableUpDownCounter, error) {
m.afUDCount++
return &testCountingFloatInstrument{}, nil
}
func (m *testMeter) Float64ObservableGauge(name string, options ...metric.Float64ObservableGaugeOption) (metric.Float64ObservableGauge, error) {
m.afGauge++
return &testCountingFloatInstrument{}, nil
}
// RegisterCallback captures the function that will be called during Collect.
func (m *testMeter) RegisterCallback(f metric.Callback, i ...metric.Observable) (metric.Registration, error) {
m.callbacks = append(m.callbacks, f)
return testReg{
f: func(idx int) func() {
return func() { m.callbacks[idx] = nil }
}(len(m.callbacks) - 1),
}, nil
}
type testReg struct {
embedded.Registration
f func()
}
func (r testReg) Unregister() error {
r.f()
return nil
}
// This enables async collection.
func (m *testMeter) collect() {
ctx := context.Background()
o := observationRecorder{ctx: ctx}
for _, f := range m.callbacks {
if f == nil {
// Unregister.
continue
}
_ = f(ctx, o)
}
}
type observationRecorder struct {
embedded.Observer
ctx context.Context
}
func (o observationRecorder) ObserveFloat64(i metric.Float64Observable, value float64, _ ...metric.ObserveOption) {
iImpl, ok := i.(*testCountingFloatInstrument)
if ok {
iImpl.observe()
}
}
func (o observationRecorder) ObserveInt64(i metric.Int64Observable, value int64, _ ...metric.ObserveOption) {
iImpl, ok := i.(*testCountingIntInstrument)
if ok {
iImpl.observe()
}
}
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