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// Copyright 2018 Google LLC
//
// 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 testutil
import (
"log"
"time"
"go.opencensus.io/plugin/ocgrpc"
"go.opencensus.io/stats/view"
"go.opencensus.io/trace"
)
// TestExporter is a test utility exporter. It should be created with NewtestExporter.
type TestExporter struct {
Spans []*trace.SpanData
Stats chan *view.Data
}
// NewTestExporter creates a TestExporter and registers it with OpenCensus.
func NewTestExporter() *TestExporter {
te := &TestExporter{Stats: make(chan *view.Data)}
view.RegisterExporter(te)
view.SetReportingPeriod(time.Millisecond)
if err := view.Register(ocgrpc.DefaultClientViews...); err != nil {
log.Fatal(err)
}
trace.RegisterExporter(te)
trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
return te
}
// ExportSpan exports a span.
func (te *TestExporter) ExportSpan(s *trace.SpanData) {
te.Spans = append(te.Spans, s)
}
// ExportView exports a view.
func (te *TestExporter) ExportView(vd *view.Data) {
if len(vd.Rows) > 0 {
select {
case te.Stats <- vd:
default:
}
}
}
// Unregister unregisters the exporter from OpenCensus.
func (te *TestExporter) Unregister() {
view.UnregisterExporter(te)
trace.UnregisterExporter(te)
view.SetReportingPeriod(0) // reset to default value
}
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