initial commit

Signed-off-by: Derek McQuay <derekmcquay@gmail.com>

vendor/cloud.google.com/go/internal/testutil/go18.go

@@ -0,0 +1,64 @@
+// Copyright 2018 Google Inc. All Rights Reserved.
+//
+// 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.
+
+// +build go1.8
+
+package testutil
+
+import (
+	"log"
+	"time"
+
+	"go.opencensus.io/plugin/ocgrpc"
+	"go.opencensus.io/stats/view"
+	"go.opencensus.io/trace"
+)
+
+type TestExporter struct {
+	Spans []*trace.SpanData
+	Stats chan *view.Data
+}
+
+func NewTestExporter() *TestExporter {
+	te := &TestExporter{Stats: make(chan *view.Data)}
+
+	view.RegisterExporter(te)
+	view.SetReportingPeriod(time.Millisecond)
+	if err := view.Register(ocgrpc.ClientRequestCountView); err != nil {
+		log.Fatal(err)
+	}
+
+	trace.RegisterExporter(te)
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
+
+	return te
+}
+
+func (te *TestExporter) ExportSpan(s *trace.SpanData) {
+	te.Spans = append(te.Spans, s)
+}
+
+func (te *TestExporter) ExportView(vd *view.Data) {
+	if len(vd.Rows) > 0 {
+		select {
+		case te.Stats <- vd:
+		default:
+		}
+	}
+}
+
+func (te *TestExporter) Unregister() {
+	view.UnregisterExporter(te)
+	trace.UnregisterExporter(te)
+}