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reducer_test.go
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reducer_test.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package reducer_test
import (
"context"
"testing"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric/instrument"
"go.opentelemetry.io/otel/sdk/instrumentation"
metricsdk "go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
"go.opentelemetry.io/otel/sdk/metric/processor/basic"
"go.opentelemetry.io/otel/sdk/metric/processor/processortest"
"go.opentelemetry.io/otel/sdk/metric/processor/reducer"
"go.opentelemetry.io/otel/sdk/metric/sdkapi"
"go.opentelemetry.io/otel/sdk/resource"
)
var (
kvs1 = []attribute.KeyValue{
attribute.Int("A", 1),
attribute.Int("B", 2),
attribute.Int("C", 3),
}
kvs2 = []attribute.KeyValue{
attribute.Int("A", 1),
attribute.Int("B", 0),
attribute.Int("C", 3),
}
)
type testFilter struct{}
func (testFilter) AttributeFilterFor(_ *sdkapi.Descriptor) attribute.Filter {
return func(attr attribute.KeyValue) bool {
return attr.Key == "A" || attr.Key == "C"
}
}
func generateData(t *testing.T, impl sdkapi.MeterImpl) {
ctx := context.Background()
meter := sdkapi.WrapMeterImpl(impl)
counter, err := meter.SyncFloat64().Counter("counter.sum")
require.NoError(t, err)
counter.Add(ctx, 100, kvs1...)
counter.Add(ctx, 100, kvs2...)
counterObserver, err := meter.AsyncInt64().Counter("observer.sum")
require.NoError(t, err)
err = meter.RegisterCallback([]instrument.Asynchronous{counterObserver}, func(ctx context.Context) {
counterObserver.Observe(ctx, 10, kvs1...)
counterObserver.Observe(ctx, 10, kvs2...)
})
require.NoError(t, err)
}
func TestFilterProcessor(t *testing.T) {
testProc := processortest.NewProcessor(
processortest.AggregatorSelector(),
attribute.DefaultEncoder(),
)
accum := metricsdk.NewAccumulator(
reducer.New(testFilter{}, processortest.NewCheckpointer(testProc)),
)
generateData(t, accum)
accum.Collect(context.Background())
require.EqualValues(t, map[string]float64{
"counter.sum/A=1,C=3/": 200,
"observer.sum/A=1,C=3/": 20,
}, testProc.Values())
}
// Test a filter with the ../basic Processor.
func TestFilterBasicProcessor(t *testing.T) {
basicProc := basic.New(processortest.AggregatorSelector(), aggregation.CumulativeTemporalitySelector())
accum := metricsdk.NewAccumulator(
reducer.New(testFilter{}, basicProc),
)
exporter := processortest.New(basicProc, attribute.DefaultEncoder())
generateData(t, accum)
basicProc.StartCollection()
accum.Collect(context.Background())
if err := basicProc.FinishCollection(); err != nil {
t.Error(err)
}
res := resource.NewSchemaless(attribute.String("R", "V"))
require.NoError(t, exporter.Export(context.Background(), res, processortest.OneInstrumentationLibraryReader(instrumentation.Scope{
Name: "test",
}, basicProc.Reader())))
require.EqualValues(t, map[string]float64{
"counter.sum/A=1,C=3/R=V": 200,
"observer.sum/A=1,C=3/R=V": 20,
}, exporter.Values())
}