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main.go
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main.go
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// Copyright 2017, 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.
// Command stackdriver is an example program that collects data for
// video size. Collected data is exported to
// Stackdriver Monitoring.
package main
import (
"context"
"fmt"
"log"
"time"
"contrib.go.opencensus.io/exporter/stackdriver"
"contrib.go.opencensus.io/exporter/stackdriver/monitoredresource"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
)
// Create measures. The program will record measures for the size of
// processed videos and the nubmer of videos marked as spam.
var videoSize = stats.Int64("my.org/measure/video_size", "size of processed videos", stats.UnitBytes)
func main() {
ctx := context.Background()
// Collected view data will be reported to Stackdriver Monitoring API
// via the Stackdriver exporter.
//
// In order to use the Stackdriver exporter, enable Stackdriver Monitoring API
// at https://console.cloud.google.com/apis/dashboard.
//
// Once API is enabled, you can use Google Application Default Credentials
// to setup the authorization.
// See https://developers.google.com/identity/protocols/application-default-credentials
// for more details.
exporter, err := stackdriver.NewExporter(stackdriver.Options{
ProjectID: "your-project-id", // Google Cloud Console project ID for stackdriver.
MonitoredResource: monitoredresource.Autodetect(),
})
if err != nil {
log.Fatal(err)
}
view.RegisterExporter(exporter)
// Set reporting period to report data at every second.
view.SetReportingPeriod(1 * time.Second)
// Create view to see the processed video size cumulatively.
// Subscribe will allow view data to be exported.
// Once no longer need, you can unsubscribe from the view.
if err := view.Register(&view.View{
Name: "my.org/views/video_size_cum",
Description: "processed video size over time",
Measure: videoSize,
Aggregation: view.Distribution(0, 1<<16, 1<<32),
}); err != nil {
log.Fatalf("Cannot subscribe to the view: %v", err)
}
processVideo(ctx)
// Wait for a duration longer than reporting duration to ensure the stats
// library reports the collected data.
fmt.Println("Wait longer than the reporting duration...")
time.Sleep(1 * time.Minute)
}
func processVideo(ctx context.Context) {
// Do some processing and record stats.
stats.Record(ctx, videoSize.M(25648))
}