// 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(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[1] 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(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[1] 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) } }