ekristen/aws-nuke

package resources

import (
    "context"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/service/cloudwatch"

    "github.com/ekristen/libnuke/pkg/registry"
    "github.com/ekristen/libnuke/pkg/resource"
    "github.com/ekristen/libnuke/pkg/types"

    "github.com/ekristen/aws-nuke/v3/pkg/nuke"
)

const CloudWatchAlarmResource = "CloudWatchAlarm"

func init() {
    registry.Register(&registry.Registration{
        Name:     CloudWatchAlarmResource,
        Scope:    nuke.Account,
        Resource: &CloudWatchAlarm{},
        Lister:   &CloudWatchAlarmLister{},
    })
}

type CloudWatchAlarmLister struct{}

func (l *CloudWatchAlarmLister) List(_ context.Context, o interface{}) ([]resource.Resource, error) {
    opts := o.(*nuke.ListerOpts)

    svc := cloudwatch.New(opts.Session)
    resources := make([]resource.Resource, 0)

    params := &cloudwatch.DescribeAlarmsInput{
        MaxRecords: aws.Int64(100),
    }

    for {
        output, err := svc.DescribeAlarms(params)
        if err != nil {
            return nil, err
        }

        for _, metricAlarm := range output.MetricAlarms {
            tags, err := GetAlarmTags(svc, metricAlarm.AlarmArn)
            if err != nil {
                return nil, err
            }
            resources = append(resources, &CloudWatchAlarm{
                svc:       svc,
                alarmName: metricAlarm.AlarmName,
                tags:      tags,
            })
        }

        if output.NextToken == nil {
            break
        }

        params.NextToken = output.NextToken
    }

    return resources, nil
}

func GetAlarmTags(svc *cloudwatch.CloudWatch, arn *string) ([]*cloudwatch.Tag, error) {
    resp, err := svc.ListTagsForResource(&cloudwatch.ListTagsForResourceInput{ResourceARN: arn})
    if err != nil {
        return nil, err
    }

    return resp.Tags, nil
}

type CloudWatchAlarm struct {
    svc       *cloudwatch.CloudWatch
    alarmName *string
    tags      []*cloudwatch.Tag
}

func (f *CloudWatchAlarm) Remove(_ context.Context) error {
    _, err := f.svc.DeleteAlarms(&cloudwatch.DeleteAlarmsInput{
        AlarmNames: []*string{f.alarmName},
    })

    return err
}

func (f *CloudWatchAlarm) Properties() types.Properties {
    properties := types.NewProperties()
    properties.Set("Name", f.alarmName)

    for _, tag := range f.tags {
        properties.SetTag(tag.Key, tag.Value)
    }
    return properties
}

func (f *CloudWatchAlarm) String() string {
    return *f.alarmName
}