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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package metric // import "go.opentelemetry.io/otel/sdk/metric"
import (
"context"
"runtime"
"sync"
"testing"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
)
func TestFixedSizeExemplarConcurrentSafe(t *testing.T) {
// Tests https://github.com/open-telemetry/opentelemetry-go/issues/5814
t.Setenv("OTEL_METRICS_EXEMPLAR_FILTER", "always_on")
r := NewManualReader()
m := NewMeterProvider(WithReader(r)).Meter("exemplar-concurrency")
// Use two instruments to get concurrent access to any shared globals.
i0, err := m.Int64Counter("counter.0")
require.NoError(t, err)
i1, err := m.Int64Counter("counter.1")
require.NoError(t, err)
ctx, cancel := context.WithCancel(context.Background())
add := func() {
i0.Add(ctx, 1)
i1.Add(ctx, 2)
}
goRoutines := max(10, runtime.NumCPU())
var wg sync.WaitGroup
for n := 0; n < goRoutines; n++ {
wg.Add(1)
go func() {
defer wg.Done()
for {
select {
case <-ctx.Done():
return
default:
require.NotPanics(t, add)
}
}
}()
}
const collections = 100
var rm metricdata.ResourceMetrics
for c := 0; c < collections; c++ {
require.NotPanics(t, func() { _ = r.Collect(ctx, &rm) })
}
cancel()
wg.Wait()
}
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