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2024/3/6

Golang 取得AWS CloudWatch metric統計資料

Go以Google API Client Libraries來取得CloudWatch metric統計資料。


事前要求

參考「AWS EC2 建立instance」建立一個instance,為CloudWatch指標的統計資料對象。

參考「Golang 建立AWS CloudWatch API client」建立CloudWatch API client。


取得metric統計資料

呼叫cloudwatch.Client.GetMetricStatistics,傳入cloudwatch.GetMetricStatisticsInput參數來取得metric統計資料。

cloudwatch.GetMetricStatisticsInput欄位如下:

  • MetricName - 填入指標(metric)名稱。
  • StartTime - 統計起始時間。
  • EndTime - 統計結束時間。
  • Period - 統計時間刻度,單位為秒,例如600即為600秒,也就是每10分鐘統計一次。
  • NamceSpace - Metrics分類名稱,項下有多種指標。參考namcespace列表。
  • Statistics - 統計指標,例如平均值(Average)、最大值(Maximum)。
  • Dimensions - 用來識別指標對象的名值對參數,Name為維度名稱,Value為值。參考EC2的metric dimensions。例如這邊要查循的維度為InstanceId,值為instance的id。

main.go

package main

import (
    "context"
    "fmt"
    "time"

    "github.com/aws/aws-sdk-go-v2/aws"
    "github.com/aws/aws-sdk-go-v2/config"
    "github.com/aws/aws-sdk-go-v2/service/cloudwatch"
    "github.com/aws/aws-sdk-go-v2/service/cloudwatch/types"
)

func main() {
    ctx := context.TODO()
    client := NewCloudWatchClient(ctx)

    output, err := client.GetMetricStatistics(ctx, &cloudwatch.GetMetricStatisticsInput{
        MetricName: aws.String("CPUUtilization"),
        StartTime:  aws.Time(time.Date(2024, 3, 5, 14, 0, 0, 0, time.UTC)), // 2024-03-05T14:00:00Z
        EndTime:    aws.Time(time.Date(2024, 3, 5, 15, 0, 0, 0, time.UTC)), // 2024-03-05T15:00:00Z
        Period:     aws.Int32(600),
        Namespace:  aws.String("AWS/EC2"),
        Statistics: []types.Statistic{types.StatisticAverage},
        Dimensions: []types.Dimension{
            {
                Name:  aws.String("InstanceId"),
                Value: aws.String("i-015766eb6a31d3413"),
            },
        },
    })
    if err != nil {
        panic(err)
    }

    for _, point := range output.Datapoints {
        fmt.Println(*point.Timestamp)
        fmt.Println(*point.Average)
        fmt.Println(point.Unit)
        fmt.Println("========================================")
    }
}

func NewCloudWatchClient(ctx context.Context) *cloudwatch.Client {
    cfg, err := config.LoadDefaultConfig(
        ctx,
        config.WithRegion("ap-northeast-1"),
    )
    if err != nil {
        panic(err)
    }

    return cloudwatch.NewFromConfig(cfg) // Create an Amazon CloudWatch service client
}

github



測試

執行Go應用程式印出以下。

2024-03-05 14:30:00 +0000 UTC
0.25065857909898137
Percent
========================================
2024-03-05 14:20:00 +0000 UTC
0.23285130082378647
Percent
========================================
2024-03-05 14:50:00 +0000 UTC
0.2331328594860565
Percent
========================================
2024-03-05 14:10:00 +0000 UTC
0.23200473950299177
Percent
========================================
2024-03-05 14:00:00 +0000 UTC
0.2306822395253995
Percent
========================================
2024-03-05 14:40:00 +0000 UTC
0.2328424871449593
Percent
========================================


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