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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package metric
import (
"context"
"fmt"
"strings"
"testing"
"github.com/go-logr/logr/funcr"
"github.com/go-logr/logr/testr"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel"
api "go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/metric/noop"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
)
func TestMeterConcurrentSafe(t *testing.T) {
const name = "TestMeterConcurrentSafe meter"
mp := NewMeterProvider()
done := make(chan struct{})
go func() {
defer close(done)
_ = mp.Meter(name)
}()
_ = mp.Meter(name)
<-done
}
func TestForceFlushConcurrentSafe(t *testing.T) {
mp := NewMeterProvider()
done := make(chan struct{})
go func() {
defer close(done)
_ = mp.ForceFlush(context.Background())
}()
_ = mp.ForceFlush(context.Background())
<-done
}
func TestShutdownConcurrentSafe(t *testing.T) {
mp := NewMeterProvider()
done := make(chan struct{})
go func() {
defer close(done)
_ = mp.Shutdown(context.Background())
}()
_ = mp.Shutdown(context.Background())
<-done
}
func TestMeterAndShutdownConcurrentSafe(t *testing.T) {
const name = "TestMeterAndShutdownConcurrentSafe meter"
mp := NewMeterProvider()
done := make(chan struct{})
go func() {
defer close(done)
_ = mp.Shutdown(context.Background())
}()
_ = mp.Meter(name)
<-done
}
func TestMeterDoesNotPanicForEmptyMeterProvider(t *testing.T) {
mp := MeterProvider{}
assert.NotPanics(t, func() { _ = mp.Meter("") })
}
func TestForceFlushDoesNotPanicForEmptyMeterProvider(t *testing.T) {
mp := MeterProvider{}
assert.NotPanics(t, func() { _ = mp.ForceFlush(context.Background()) })
}
func TestShutdownDoesNotPanicForEmptyMeterProvider(t *testing.T) {
mp := MeterProvider{}
assert.NotPanics(t, func() { _ = mp.Shutdown(context.Background()) })
}
func TestMeterProviderReturnsSameMeter(t *testing.T) {
mp := MeterProvider{}
mtr := mp.Meter("")
assert.Same(t, mtr, mp.Meter(""))
assert.NotSame(t, mtr, mp.Meter("diff"))
}
func TestEmptyMeterName(t *testing.T) {
var buf strings.Builder
warnLevel := 1
l := funcr.New(func(prefix, args string) {
_, _ = buf.WriteString(fmt.Sprint(prefix, args))
}, funcr.Options{Verbosity: warnLevel})
otel.SetLogger(l)
mp := NewMeterProvider()
mp.Meter("")
assert.Contains(t, buf.String(), `"level"=1 "msg"="Invalid Meter name." "name"=""`)
}
func TestMeterProviderReturnsNoopMeterAfterShutdown(t *testing.T) {
mp := NewMeterProvider()
m := mp.Meter("")
_, ok := m.(noop.Meter)
assert.False(t, ok, "Meter from running MeterProvider is NoOp")
require.NoError(t, mp.Shutdown(context.Background()))
m = mp.Meter("")
_, ok = m.(noop.Meter)
assert.Truef(t, ok, "Meter from shutdown MeterProvider is not NoOp: %T", m)
}
func TestMeterProviderMixingOnRegisterErrors(t *testing.T) {
otel.SetLogger(testr.New(t))
rdr0 := NewManualReader()
mp0 := NewMeterProvider(WithReader(rdr0))
rdr1 := NewManualReader()
mp1 := NewMeterProvider(WithReader(rdr1))
// Meters with the same scope but different MeterProviders.
m0 := mp0.Meter("TestMeterProviderMixingOnRegisterErrors")
m1 := mp1.Meter("TestMeterProviderMixingOnRegisterErrors")
m0Gauge, err := m0.Float64ObservableGauge("float64Gauge")
require.NoError(t, err)
m1Gauge, err := m1.Int64ObservableGauge("int64Gauge")
require.NoError(t, err)
_, err = m0.RegisterCallback(
func(_ context.Context, o api.Observer) error {
o.ObserveFloat64(m0Gauge, 2)
// Observe an instrument from a different MeterProvider.
o.ObserveInt64(m1Gauge, 1)
return nil
},
m0Gauge, m1Gauge,
)
assert.Error(
t,
err,
"Instrument registered with Meter from different MeterProvider",
)
var data metricdata.ResourceMetrics
_ = rdr0.Collect(context.Background(), &data)
// Only the metrics from mp0 should be produced.
assert.Len(t, data.ScopeMetrics, 1)
err = rdr1.Collect(context.Background(), &data)
assert.NoError(t, err, "Errored when collect should be a noop")
assert.Empty(
t, data.ScopeMetrics,
"Metrics produced for instrument collected by different MeterProvider",
)
}
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