ekristen/aws-nuke

package resources

import (
    "context"

    "fmt"

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

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

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

const ECSClusterInstanceResource = "ECSClusterInstance"

func init() {
    registry.Register(&registry.Registration{
        Name:     ECSClusterInstanceResource,
        Scope:    nuke.Account,
        Resource: &ECSClusterInstance{},
        Lister:   &ECSClusterInstanceLister{},
    })
}

type ECSClusterInstanceLister struct{}

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

    svc := ecs.New(opts.Session)
    resources := make([]resource.Resource, 0)
    var clusters []*string

    clusterParams := &ecs.ListClustersInput{
        MaxResults: aws.Int64(100),
    }

    // Iterate over clusters to ensure we dont presume its always default associations
    for {
        output, err := svc.ListClusters(clusterParams)
        if err != nil {
            return nil, err
        }

        clusters = append(clusters, output.ClusterArns...)

        if output.NextToken == nil {
            break
        }

        clusterParams.NextToken = output.NextToken
    }

    // Iterate over known clusters and discover their instances
    // to prevent assuming default is always used
    for _, clusterArn := range clusters {
        instanceParams := &ecs.ListContainerInstancesInput{
            Cluster:    clusterArn,
            MaxResults: aws.Int64(100),
        }
        output, err := svc.ListContainerInstances(instanceParams)
        if err != nil {
            return nil, err
        }

        for _, instanceArn := range output.ContainerInstanceArns {
            resources = append(resources, &ECSClusterInstance{
                svc:         svc,
                instanceARN: instanceArn,
                clusterARN:  clusterArn,
            })
        }

        if output.NextToken == nil {
            break
        }

        instanceParams.NextToken = output.NextToken
    }

    return resources, nil
}

type ECSClusterInstance struct {
    svc         *ecs.ECS
    instanceARN *string
    clusterARN  *string
}

func (f *ECSClusterInstance) Remove(_ context.Context) error {
    _, err := f.svc.DeregisterContainerInstance(&ecs.DeregisterContainerInstanceInput{
        Cluster:           f.clusterARN,
        ContainerInstance: f.instanceARN,
        Force:             aws.Bool(true),
    })

    return err
}

func (f *ECSClusterInstance) String() string {
    return fmt.Sprintf("%s -> %s", *f.instanceARN, *f.clusterARN)
}