1// Copyright 2017, OpenCensus Authors 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15// Command stackdriver is an example program that collects data for 16// video size. Collected data is exported to 17// Stackdriver Monitoring. 18package main 19 20import ( 21 "context" 22 "fmt" 23 "log" 24 "time" 25 26 "contrib.go.opencensus.io/exporter/stackdriver" 27 "contrib.go.opencensus.io/exporter/stackdriver/monitoredresource" 28 "go.opencensus.io/stats" 29 "go.opencensus.io/stats/view" 30) 31 32// Create measures. The program will record measures for the size of 33// processed videos and the nubmer of videos marked as spam. 34var videoSize = stats.Int64("my.org/measure/video_size", "size of processed videos", stats.UnitBytes) 35 36func main() { 37 ctx := context.Background() 38 39 // Collected view data will be reported to Stackdriver Monitoring API 40 // via the Stackdriver exporter. 41 // 42 // In order to use the Stackdriver exporter, enable Stackdriver Monitoring API 43 // at https://console.cloud.google.com/apis/dashboard. 44 // 45 // Once API is enabled, you can use Google Application Default Credentials 46 // to setup the authorization. 47 // See https://developers.google.com/identity/protocols/application-default-credentials 48 // for more details. 49 se, err := stackdriver.NewExporter(stackdriver.Options{ 50 ProjectID: "your-project-id", // Google Cloud Console project ID for stackdriver. 51 MonitoredResource: monitoredresource.Autodetect(), 52 }) 53 se.StartMetricsExporter() 54 defer se.StopMetricsExporter() 55 56 if err != nil { 57 log.Fatal(err) 58 } 59 60 // Create view to see the processed video size cumulatively. 61 // Subscribe will allow view data to be exported. 62 // Once no longer need, you can unsubscribe from the view. 63 if err := view.Register(&view.View{ 64 Name: "my.org/views/video_size_cum", 65 Description: "processed video size over time", 66 Measure: videoSize, 67 Aggregation: view.Distribution(1<<16, 1<<32), 68 }); err != nil { 69 log.Fatalf("Cannot subscribe to the view: %v", err) 70 } 71 72 processVideo(ctx) 73 74 // Wait for a duration longer than reporting duration to ensure the stats 75 // library reports the collected data. 76 fmt.Println("Wait longer than the reporting duration...") 77 time.Sleep(1 * time.Minute) 78} 79 80func processVideo(ctx context.Context) { 81 // Do some processing and record stats. 82 stats.Record(ctx, videoSize.M(25648)) 83} 84