/
main.go
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/
main.go
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// Copyright 2019 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
//
// https://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.
//go:build go1.8
// +build go1.8
// Sample opencensus_spanner_quickstart contains a sample application that
// uses Google Spanner Go client, and reports metrics
// and traces for the outgoing requests.
package main
import (
"context"
"log"
"cloud.google.com/go/spanner"
"contrib.go.opencensus.io/exporter/stackdriver"
"go.opencensus.io/trace"
)
func main() {
ctx := context.Background()
// Enable OpenCensus exporters to export traces and metrics
// to Stackdriver Monitoring and Tracing.
// Exporters use Application Default Credentials to authenticate.
// See https://developers.google.com/identity/protocols/application-default-credentials
// for more details.
exporter, err := stackdriver.NewExporter(stackdriver.Options{})
if err != nil {
log.Fatal(err)
}
// Flush must be called before main() exits to ensure metrics are recorded.
defer exporter.Flush()
trace.RegisterExporter(exporter)
if err := exporter.StartMetricsExporter(); err != nil {
log.Fatalf("Error starting metric exporter: %v", err)
}
defer exporter.StopMetricsExporter()
// Use trace.AlwaysSample() to always record traces. The
// default sampler skips some traces to conserve resources,
// but can make it hard to debug test traffic. So, remove
// the following line before pushing to production.
trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
// This database must exist.
databaseName := "projects/your-project-id/instances/your-instance-id/databases/your-database-id"
client, err := spanner.NewClient(ctx, databaseName)
if err != nil {
log.Fatalf("Failed to create client %v", err)
}
defer client.Close()
_, err = client.Apply(ctx, []*spanner.Mutation{
spanner.Insert("Users",
[]string{"name", "email"},
[]interface{}{"alice", "a@example.com"})})
if err != nil {
log.Printf("Failed to insert: %v", err)
}
}