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// Copyright 2018, OpenCensus 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 trace_test
import (
"context"
"testing"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/trace"
)
func TestTraceExemplar(t *testing.T) {
m := stats.Float64("measure."+t.Name(), "", stats.UnitDimensionless)
v := &view.View{
Measure: m,
Aggregation: view.Distribution(0, 1, 2, 3),
}
view.Register(v)
ctx := context.Background()
ctx, span := trace.StartSpan(ctx, t.Name(), trace.WithSampler(trace.AlwaysSample()))
stats.Record(ctx, m.M(1.5))
span.End()
rows, err := view.RetrieveData(v.Name)
if err != nil {
t.Fatal(err)
}
if len(rows) == 0 {
t.Fatal("len(rows) = 0; want > 0")
}
dd := rows[0].Data.(*view.DistributionData)
if got := len(dd.ExemplarsPerBucket); got < 3 {
t.Fatalf("len(dd.ExemplarsPerBucket) = %d; want >= 2", got)
}
exemplar := dd.ExemplarsPerBucket[2]
if exemplar == nil {
t.Fatal("Expected exemplar")
}
if got, want := exemplar.Value, 1.5; got != want {
t.Fatalf("exemplar.Value = %v; got %v", got, want)
}
if _, ok := exemplar.Attachments["trace_id"]; !ok {
t.Fatalf("exemplar.Attachments = %v; want trace_id key", exemplar.Attachments)
}
if _, ok := exemplar.Attachments["span_id"]; !ok {
t.Fatalf("exemplar.Attachments = %v; want span_id key", exemplar.Attachments)
}
}
func TestTraceExemplar_notSampled(t *testing.T) {
m := stats.Float64("measure."+t.Name(), "", stats.UnitDimensionless)
v := &view.View{
Measure: m,
Aggregation: view.Distribution(0, 1, 2, 3),
}
view.Register(v)
ctx := context.Background()
ctx, span := trace.StartSpan(ctx, t.Name(), trace.WithSampler(trace.NeverSample()))
stats.Record(ctx, m.M(1.5))
span.End()
rows, err := view.RetrieveData(v.Name)
if err != nil {
t.Fatal(err)
}
if len(rows) == 0 {
t.Fatal("len(rows) = 0; want > 0")
}
dd := rows[0].Data.(*view.DistributionData)
if got := len(dd.ExemplarsPerBucket); got < 3 {
t.Fatalf("len(buckets) = %d; want >= 2", got)
}
exemplar := dd.ExemplarsPerBucket[2]
if exemplar == nil {
t.Fatal("Expected exemplar")
}
if got, want := exemplar.Value, 1.5; got != want {
t.Fatalf("exemplar.Value = %v; got %v", got, want)
}
if _, ok := exemplar.Attachments["trace_id"]; ok {
t.Fatalf("exemplar.Attachments = %v; want no trace_id", exemplar.Attachments)
}
if _, ok := exemplar.Attachments["span_id"]; ok {
t.Fatalf("exemplar.Attachments = %v; want span_id key", exemplar.Attachments)
}
}