restic/vendor/cloud.google.com/go/spanner/oc_test.go

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// 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 spanner
import (
"testing"
"time"
"cloud.google.com/go/spanner/internal/testutil"
"go.opencensus.io/plugin/ocgrpc"
statsview "go.opencensus.io/stats/view"
"golang.org/x/net/context"
"google.golang.org/api/option"
"google.golang.org/grpc"
)
func TestOCStats(t *testing.T) {
// Check that stats are being exported.
te := &testExporter{c: make(chan *statsview.Data)}
statsview.RegisterExporter(te)
defer statsview.UnregisterExporter(te)
statsview.SetReportingPeriod(time.Millisecond)
if err := ocgrpc.ClientRequestCountView.Subscribe(); err != nil {
t.Fatal(err)
}
ms := testutil.NewMockCloudSpanner(t, trxTs)
ms.Serve()
ctx := context.Background()
c, err := NewClient(ctx, "projects/P/instances/I/databases/D",
option.WithEndpoint(ms.Addr()),
option.WithGRPCDialOption(grpc.WithInsecure()),
option.WithoutAuthentication())
if err != nil {
t.Fatal(err)
}
defer c.Close()
c.Single().ReadRow(ctx, "Users", Key{"alice"}, []string{"email"})
// Wait until we see data from the view.
select {
case <-te.c:
case <-time.After(1 * time.Second):
t.Fatal("no stats were exported before timeout")
}
}
type testExporter struct {
c chan *statsview.Data
}
func (e *testExporter) ExportView(vd *statsview.Data) {
if len(vd.Rows) > 0 {
select {
case e.c <- vd:
default:
}
}
}