1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
// 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 helloworld is an example program that collects data for
// video size.
package main
import (
"context"
"fmt"
"log"
"math/rand"
"time"
"go.opencensus.io/examples/exporter"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
"go.opencensus.io/trace"
)
var (
// frontendKey allows us to breakdown the recorded data
// by the frontend used when uploading the video.
frontendKey tag.Key
// videoSize will measure the size of processed videos.
videoSize *stats.Int64Measure
)
func main() {
ctx := context.Background()
// Register an exporter to be able to retrieve
// the data from the subscribed views.
e, err := exporter.NewLogExporter(exporter.Options{ReportingInterval: time.Second})
if err != nil {
log.Fatal(err)
}
e.Start()
defer e.Stop()
defer e.Close()
trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
frontendKey = tag.MustNewKey("example.com/keys/frontend")
videoSize = stats.Int64("example.com/measure/video_size", "size of processed videos", stats.UnitBytes)
view.SetReportingPeriod(2 * time.Second)
// Create view to see the processed video size
// distribution broken down by frontend.
// Register will allow view data to be exported.
if err := view.Register(&view.View{
Name: "example.com/views/video_size",
Description: "processed video size over time",
TagKeys: []tag.Key{frontendKey},
Measure: videoSize,
Aggregation: view.Distribution(1<<16, 1<<32),
}); err != nil {
log.Fatalf("Cannot register view: %v", err)
}
// Process the video.
process(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(4 * time.Second)
}
// process processes the video and instruments the processing
// by creating a span and collecting metrics about the operation.
func process(ctx context.Context) {
ctx, err := tag.New(ctx,
tag.Insert(frontendKey, "mobile-ios9.3.5"),
)
if err != nil {
log.Fatal(err)
}
ctx, span := trace.StartSpan(ctx, "example.com/ProcessVideo")
defer span.End()
// Process video.
// Record the processed video size.
// Sleep for [1,10] milliseconds to fake work.
time.Sleep(time.Duration(rand.Intn(10)+1) * time.Millisecond)
stats.Record(ctx, videoSize.M(25648))
}
|
