ekristen/aws-nuke

package resources

import (
    "context"
    "fmt"
    "strings"
    "time"

    "github.com/sirupsen/logrus"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/service/cloudformation"
    "github.com/aws/aws-sdk-go/service/cloudformation/cloudformationiface"

    "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 CloudFormationStackSetResource = "CloudFormationStackSet"

func init() {
    registry.Register(&registry.Registration{
        Name:     CloudFormationStackSetResource,
        Scope:    nuke.Account,
        Resource: &CloudFormationStackSet{},
        Lister:   &CloudFormationStackSetLister{},
    })
}

type CloudFormationStackSetLister struct{}

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

    svc := cloudformation.New(opts.Session)

    params := &cloudformation.ListStackSetsInput{
        Status: aws.String(cloudformation.StackSetStatusActive),
    }
    resources := make([]resource.Resource, 0)

    for {
        resp, err := svc.ListStackSets(params)
        if err != nil {
            return nil, err
        }
        for _, stackSetSummary := range resp.Summaries {
            resources = append(resources, &CloudFormationStackSet{
                svc:             svc,
                stackSetSummary: stackSetSummary,
                sleepDuration:   10 * time.Second,
            })
        }

        if resp.NextToken == nil {
            break
        }

        params.NextToken = resp.NextToken
    }

    return resources, nil
}

type CloudFormationStackSet struct {
    svc             cloudformationiface.CloudFormationAPI
    stackSetSummary *cloudformation.StackSetSummary
    sleepDuration   time.Duration
}

func (cfs *CloudFormationStackSet) findStackInstances() (map[string][]string, error) {
    accounts := make(map[string][]string)

    input := &cloudformation.ListStackInstancesInput{
        StackSetName: cfs.stackSetSummary.StackSetName,
    }

    for {
        resp, err := cfs.svc.ListStackInstances(input)
        if err != nil {
            return nil, err
        }
        for _, stackInstanceSummary := range resp.Summaries {
            if regions, ok := accounts[*stackInstanceSummary.Account]; !ok {
                accounts[*stackInstanceSummary.Account] = []string{*stackInstanceSummary.Region}
            } else {
                accounts[*stackInstanceSummary.Account] = append(regions, *stackInstanceSummary.Region)
            }
        }

        if resp.NextToken == nil {
            break
        }

        input.NextToken = resp.NextToken
    }

    return accounts, nil
}

func (cfs *CloudFormationStackSet) waitForStackSetOperation(operationID string) error {
    for {
        result, err := cfs.svc.DescribeStackSetOperation(&cloudformation.DescribeStackSetOperationInput{
            StackSetName: cfs.stackSetSummary.StackSetName,
            OperationId:  &operationID,
        })
        if err != nil {
            return err
        }
        logrus.Infof("Got stackInstance operation status on stackSet=%s operationID=%s status=%s",
            *cfs.stackSetSummary.StackSetName, operationID, *result.StackSetOperation.Status)

        if *result.StackSetOperation.Status == cloudformation.StackSetOperationResultStatusSucceeded {
            return nil
        } else if *result.StackSetOperation.Status == cloudformation.StackSetOperationResultStatusFailed ||
            *result.StackSetOperation.Status == cloudformation.StackSetOperationResultStatusCancelled {
            return fmt.Errorf("unable to delete stackSet=%s operationID=%s status=%s",
                *cfs.stackSetSummary.StackSetName, operationID, *result.StackSetOperation.Status)
        } else {
            logrus.Infof("Waiting on stackSet=%s operationID=%s status=%s",
                *cfs.stackSetSummary.StackSetName, operationID, *result.StackSetOperation.Status)

            time.Sleep(cfs.sleepDuration)
        }
    }
}

func (cfs *CloudFormationStackSet) deleteStackInstances(accountID string, regions []string) error {
    logrus.Infof("Deleting stack instance accountID=%s regions=%s", accountID, strings.Join(regions, ","))
    regionsInput := make([]*string, len(regions))
    for i, region := range regions {
        regionsInput[i] = aws.String(region)
        fmt.Printf("region=%s i=%d\n", region, i)
    }
    result, err := cfs.svc.DeleteStackInstances(&cloudformation.DeleteStackInstancesInput{
        StackSetName: cfs.stackSetSummary.StackSetName,
        Accounts:     []*string{&accountID},
        Regions:      regionsInput,
        // this will remove the stack set instance from the stackset, but will leave the stack
        // in the account/region it was deployed to
        RetainStacks: aws.Bool(true),
    })

    fmt.Printf("got result=%v err=%v\n", result, err)

    if result == nil {
        return fmt.Errorf("got null result")
    }
    if err != nil {
        return err
    }

    return cfs.waitForStackSetOperation(*result.OperationId)
}

func (cfs *CloudFormationStackSet) Remove(_ context.Context) error {
    accounts, err := cfs.findStackInstances()
    if err != nil {
        return err
    }
    for accountID, regions := range accounts {
        err := cfs.deleteStackInstances(accountID, regions)
        if err != nil {
            return err
        }
    }
    _, err = cfs.svc.DeleteStackSet(&cloudformation.DeleteStackSetInput{
        StackSetName: cfs.stackSetSummary.StackSetName,
    })
    return err
}

func (cfs *CloudFormationStackSet) Properties() types.Properties {
    properties := types.NewProperties()
    properties.Set("Name", cfs.stackSetSummary.StackSetName)
    properties.Set("StackSetId", cfs.stackSetSummary.StackSetId)

    return properties
}

func (cfs *CloudFormationStackSet) String() string {
    return *cfs.stackSetSummary.StackSetName
}