forked from open-telemetry/opentelemetry-go-contrib
/
fallback_sampler_test.go
74 lines (58 loc) · 2.18 KB
/
fallback_sampler_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 xray
import (
"testing"
"time"
"github.com/stretchr/testify/assert"
"go.opentelemetry.io/otel/sdk/trace"
)
// assert sampling using fallback sampler.
func TestSampleUsingFallbackSampler(t *testing.T) {
fs := NewFallbackSampler()
assert.NotEmpty(t, fs.defaultSampler)
assert.Equal(t, fs.quotaBalance, 1.0)
sd := fs.ShouldSample(trace.SamplingParameters{})
assert.Equal(t, trace.RecordAndSample, sd.Decision)
}
// assert that we only borrow 1 req/sec.
func TestBorrowOnePerSecond(t *testing.T) {
fs := NewFallbackSampler()
borrowed := fs.take(time.Unix(1500000000, 0), 1.0)
// assert that borrowing one per second
assert.True(t, borrowed)
borrowed = fs.take(time.Unix(1500000000, 0), 1.0)
// assert that borrowing again is false during that second
assert.False(t, borrowed)
borrowed = fs.take(time.Unix(1500000001, 0), 1.0)
// assert that borrowing again in next second
assert.True(t, borrowed)
}
// assert that when elapsedTime is high quotaBalance should still be close to 1.
func TestBorrowWithLargeElapsedTime(t *testing.T) {
fs := NewFallbackSampler()
borrowed := fs.take(time.Unix(1500000000, 0), 1.0)
// assert that borrowing one per second
assert.True(t, borrowed)
// Increase the time by 9 seconds
borrowed = fs.take(time.Unix(1500000009, 0), 1.0)
assert.True(t, borrowed)
assert.Equal(t, fs.quotaBalance, 0.0)
}
// assert fallback sampling description.
func TestFallbackSamplerDescription(t *testing.T) {
fs := NewFallbackSampler()
s := fs.Description()
assert.Equal(t, s, "FallbackSampler{fallback sampling with sampling config of 1 req/sec and 5% of additional requests}")
}