mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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125 lines
3.3 KiB
Go
125 lines
3.3 KiB
Go
// Copyright 2019, OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metric_test
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import (
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"context"
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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"go.opentelemetry.io/otel/api/core"
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"go.opentelemetry.io/otel/api/key"
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"go.opentelemetry.io/otel/api/metric"
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export "go.opentelemetry.io/otel/sdk/export/metric"
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sdk "go.opentelemetry.io/otel/sdk/metric"
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"go.opentelemetry.io/otel/sdk/metric/aggregator/gauge"
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)
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type monotoneBatcher struct {
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t *testing.T
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collections int
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currentValue *core.Number
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currentTime *time.Time
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}
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func (m *monotoneBatcher) AggregatorFor(rec export.Record) export.Aggregator {
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return gauge.New()
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}
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func (m *monotoneBatcher) Export(_ context.Context, record export.Record, agg export.Aggregator) {
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require.Equal(m.t, "my.gauge.name", record.Descriptor().Name())
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require.Equal(m.t, 1, len(record.Labels()))
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require.Equal(m.t, "a", string(record.Labels()[0].Key))
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require.Equal(m.t, "b", record.Labels()[0].Value.Emit())
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gauge := agg.(*gauge.Aggregator)
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val := gauge.AsNumber()
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ts := gauge.Timestamp()
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m.currentValue = &val
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m.currentTime = &ts
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m.collections++
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}
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func TestMonotoneGauge(t *testing.T) {
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ctx := context.Background()
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batcher := &monotoneBatcher{
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t: t,
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}
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sdk := sdk.New(batcher)
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gauge := sdk.NewInt64Gauge("my.gauge.name", metric.WithMonotonic(true))
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handle := gauge.AcquireHandle(sdk.Labels(key.String("a", "b")))
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require.Nil(t, batcher.currentTime)
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require.Nil(t, batcher.currentValue)
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before := time.Now()
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handle.Set(ctx, 1)
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// Until collection, expect nil.
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require.Nil(t, batcher.currentTime)
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require.Nil(t, batcher.currentValue)
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sdk.Collect(ctx)
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require.NotNil(t, batcher.currentValue)
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require.Equal(t, core.NewInt64Number(1), *batcher.currentValue)
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require.True(t, before.Before(*batcher.currentTime))
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before = *batcher.currentTime
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// Collect would ordinarily flush the record, except we're using a handle.
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sdk.Collect(ctx)
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require.Equal(t, 2, batcher.collections)
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// Increase the value to 2.
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handle.Set(ctx, 2)
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sdk.Collect(ctx)
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require.Equal(t, 3, batcher.collections)
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require.Equal(t, core.NewInt64Number(2), *batcher.currentValue)
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require.True(t, before.Before(*batcher.currentTime))
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before = *batcher.currentTime
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sdk.Collect(ctx)
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require.Equal(t, 4, batcher.collections)
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// Try to lower the value to 1, it will fail.
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handle.Set(ctx, 1)
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sdk.Collect(ctx)
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// The value and timestamp are both unmodified
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require.Equal(t, 5, batcher.collections)
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require.Equal(t, core.NewInt64Number(2), *batcher.currentValue)
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require.Equal(t, before, *batcher.currentTime)
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// Update with the same value, update the timestamp.
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handle.Set(ctx, 2)
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sdk.Collect(ctx)
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require.Equal(t, 6, batcher.collections)
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require.Equal(t, core.NewInt64Number(2), *batcher.currentValue)
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require.True(t, before.Before(*batcher.currentTime))
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}
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