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cloudformation_stack.go
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cloudformation_stack.go
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package operation
import (
"context"
"fmt"
"regexp"
"runtime"
"strings"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/cloudformation/types"
"github.com/go-to-k/delstack/internal/io"
"github.com/go-to-k/delstack/pkg/client"
"golang.org/x/sync/errgroup"
"golang.org/x/sync/semaphore"
)
var _ IOperator = (*CloudFormationStackOperator)(nil)
const StackNameRule = `^arn:aws:cloudformation:[^:]*:[0-9]*:stack/([^/]*)/.*$`
var StackNameRuleRegExp = regexp.MustCompile(StackNameRule)
type CloudFormationStackOperator struct {
config aws.Config
client client.ICloudFormation
resources []*types.StackResourceSummary
targetResourceTypes []string
}
func NewCloudFormationStackOperator(config aws.Config, client client.ICloudFormation, targetResourceTypes []string) *CloudFormationStackOperator {
return &CloudFormationStackOperator{
config: config,
client: client,
resources: []*types.StackResourceSummary{},
targetResourceTypes: targetResourceTypes,
}
}
func (o *CloudFormationStackOperator) AddResource(resource *types.StackResourceSummary) {
o.resources = append(o.resources, resource)
}
func (o *CloudFormationStackOperator) GetResourcesLength() int {
return len(o.resources)
}
func (o *CloudFormationStackOperator) DeleteResources(ctx context.Context) error {
eg, ctx := errgroup.WithContext(ctx)
sem := semaphore.NewWeighted(int64(runtime.NumCPU()))
for _, stack := range o.resources {
stack := stack
if err := sem.Acquire(ctx, 1); err != nil {
return err
}
eg.Go(func() error {
defer sem.Release(1)
stackName := StackNameRuleRegExp.ReplaceAllString(aws.ToString(stack.PhysicalResourceId), `$1`)
isRootStack := false
operatorFactory := NewOperatorFactory(o.config)
operatorCollection := NewOperatorCollection(o.config, operatorFactory, o.targetResourceTypes)
operatorManager := NewOperatorManager(operatorCollection)
return o.DeleteCloudFormationStack(ctx, aws.String(stackName), isRootStack, operatorManager)
})
}
return eg.Wait()
}
func (o *CloudFormationStackOperator) DeleteCloudFormationStack(ctx context.Context, stackName *string, isRootStack bool, operatorManager IOperatorManager) error {
isSuccess, err := o.deleteStackNormally(ctx, stackName, isRootStack)
if err != nil {
return err
}
if isSuccess {
return nil
}
stackResourceSummaries, err := o.client.ListStackResources(ctx, stackName)
if err != nil {
return err
}
operatorManager.SetOperatorCollection(stackName, stackResourceSummaries)
if err := operatorManager.CheckResourceCounts(); err != nil {
return err
}
if err := operatorManager.DeleteResourceCollection(ctx); err != nil {
return err
}
if err := o.client.DeleteStack(ctx, stackName, operatorManager.GetLogicalResourceIds()); err != nil {
return err
}
return nil
}
func (o *CloudFormationStackOperator) deleteStackNormally(ctx context.Context, stackName *string, isRootStack bool) (bool, error) {
stacksBeforeDelete, err := o.client.DescribeStacks(ctx, stackName)
if err != nil {
return false, err
}
if len(stacksBeforeDelete) == 0 && isRootStack {
errMsg := fmt.Sprintf("%s stack not found.", *stackName)
return false, fmt.Errorf("NotExistsError: %v", errMsg)
}
if len(stacksBeforeDelete) == 0 {
return true, nil
}
if stacksBeforeDelete[0].EnableTerminationProtection != nil && *stacksBeforeDelete[0].EnableTerminationProtection {
return false, fmt.Errorf("TerminationProtectionIsEnabled: %v", *stackName)
}
if err := o.client.DeleteStack(ctx, stackName, []string{}); err != nil {
return false, err
}
stacksAfterDelete, err := o.client.DescribeStacks(ctx, stackName)
if err != nil {
return false, err
}
if len(stacksAfterDelete) == 0 {
io.Logger.Info().Msg("No resources were DELETE_FAILED.")
return true, nil
}
if stacksAfterDelete[0].StackStatus != "DELETE_FAILED" {
return false, fmt.Errorf("StackStatusError: StackStatus is expected to be DELETE_FAILED, but %v: %v", stacksAfterDelete[0].StackStatus, *stackName)
}
return false, nil
}
func (o *CloudFormationStackOperator) ListStacksFilteredByKeyword(ctx context.Context, keyword *string) ([]string, error) {
filteredStacks := []string{}
// Except StackStatusDeleteComplete and xxInProgress
stackStatusFilter := []types.StackStatus{
types.StackStatusCreateFailed,
types.StackStatusCreateComplete,
types.StackStatusRollbackFailed,
types.StackStatusRollbackComplete,
types.StackStatusDeleteFailed,
types.StackStatusUpdateComplete,
types.StackStatusUpdateFailed,
types.StackStatusUpdateRollbackFailed,
types.StackStatusUpdateRollbackComplete,
types.StackStatusImportComplete,
types.StackStatusImportRollbackInProgress,
types.StackStatusImportRollbackFailed,
types.StackStatusImportRollbackComplete,
}
stackSummaries, err := o.client.ListStacks(ctx, stackStatusFilter)
if err != nil {
return filteredStacks, err
}
lowerKeyword := strings.ToLower(*keyword)
for _, stackSummary := range stackSummaries {
// pass the nested child stacks
if stackSummary.RootId != nil {
continue
}
// for case-insensitive
lowerStackName := strings.ToLower(*stackSummary.StackName)
if strings.Contains(lowerStackName, lowerKeyword) {
filteredStacks = append(filteredStacks, *stackSummary.StackName)
}
}
return filteredStacks, nil
}