/
actuator_delete.go
176 lines (142 loc) · 5.5 KB
/
actuator_delete.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package bastion
import (
"context"
"fmt"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/gardener/gardener/extensions/pkg/controller"
"github.com/gardener/gardener/extensions/pkg/util"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
reconcilerutils "github.com/gardener/gardener/pkg/controllerutils/reconciler"
"github.com/go-logr/logr"
"github.com/gardener/gardener-extension-provider-aws/pkg/apis/aws/helper"
awsclient "github.com/gardener/gardener-extension-provider-aws/pkg/aws/client"
)
func (a *actuator) Delete(ctx context.Context, log logr.Logger, bastion *extensionsv1alpha1.Bastion, cluster *controller.Cluster) error {
awsClient, err := a.getAWSClient(ctx, bastion, cluster.Shoot)
if err != nil {
return util.DetermineError(fmt.Errorf("failed to create AWS client: %w", err), helper.KnownCodes)
}
opt, err := DetermineOptions(ctx, bastion, cluster, awsClient)
if err != nil {
return util.DetermineError(fmt.Errorf("failed to setup AWS client options: %w", err), helper.KnownCodes)
}
// resolve security group name to its ID
group, err := getSecurityGroup(ctx, awsClient, opt.VPCID, opt.BastionSecurityGroupName)
if err != nil {
return util.DetermineError(fmt.Errorf("failed to list security groups: %w", err), helper.KnownCodes)
}
// if the security group still exists, remove it from the worker's security group
if group != nil {
opt.BastionSecurityGroupID = *group.GroupId
if err := removeWorkerPermissions(ctx, log, awsClient, opt); err != nil {
return util.DetermineError(fmt.Errorf("failed to remove bastion host from worker security group: %w", err), helper.KnownCodes)
}
}
if err := removeBastionInstance(ctx, log, awsClient, opt); err != nil {
return util.DetermineError(fmt.Errorf("failed to remove bastion instance: %w", err), helper.KnownCodes)
}
terminated, err := instanceIsTerminated(ctx, awsClient, opt)
if err != nil {
return util.DetermineError(fmt.Errorf("failed to check for bastion instance: %w", err), helper.KnownCodes)
}
if !terminated {
return &reconcilerutils.RequeueAfterError{
RequeueAfter: 10 * time.Second,
Cause: fmt.Errorf("bastion instance is still terminating"),
}
}
if err := removeSecurityGroup(ctx, log, awsClient, opt); err != nil {
return util.DetermineError(fmt.Errorf("failed to remove security group: %w", err), helper.KnownCodes)
}
return nil
}
func (a *actuator) ForceDelete(_ context.Context, _ logr.Logger, _ *extensionsv1alpha1.Bastion, _ *controller.Cluster) error {
return nil
}
func removeWorkerPermissions(ctx context.Context, logger logr.Logger, awsClient *awsclient.Client, opt *Options) error {
workerSecurityGroup, err := getSecurityGroup(ctx, awsClient, opt.VPCID, opt.WorkerSecurityGroupName)
if err != nil {
return fmt.Errorf("failed to fetch worker security group: %w", err)
}
// if for some reason the worker's SG is already gone, that's fine, no need to cleanup any further
if workerSecurityGroup == nil {
return nil
}
permission := workerSecurityGroupPermission(opt)
if securityGroupHasPermissions(workerSecurityGroup.IpPermissions, permission) {
logger.Info("Removing SSH ingress from worker nodes")
_, err = awsClient.EC2.RevokeSecurityGroupIngressWithContext(ctx, &ec2.RevokeSecurityGroupIngressInput{
GroupId: aws.String(opt.WorkerSecurityGroupID),
IpPermissions: []*ec2.IpPermission{permission},
})
}
return err
}
// instanceIsTerminated returns true if a machine is in Terminated state.
func instanceIsTerminated(ctx context.Context, awsClient *awsclient.Client, opt *Options) (bool, error) {
instances, err := awsClient.EC2.DescribeInstancesWithContext(ctx, &ec2.DescribeInstancesInput{
Filters: []*ec2.Filter{
{
Name: aws.String("tag:Name"),
Values: []*string{aws.String(opt.InstanceName)},
},
},
})
if err != nil {
return false, err
}
for _, reservation := range instances.Reservations {
for _, instance := range reservation.Instances {
if *instance.State.Code != InstanceStateTerminated {
return false, nil
}
}
}
return true, nil
}
func removeBastionInstance(ctx context.Context, logger logr.Logger, awsClient *awsclient.Client, opt *Options) error {
instance, err := getFirstMatchingInstance(ctx, awsClient, []*ec2.Filter{
{
Name: aws.String("tag:Name"),
Values: []*string{aws.String(opt.InstanceName)},
},
})
if err != nil {
return fmt.Errorf("failed to list instances: %w", err)
}
// nothing to do
if instance == nil {
return nil
}
logger.Info("Terminating bastion instance")
_, err = awsClient.EC2.TerminateInstancesWithContext(ctx, &ec2.TerminateInstancesInput{
InstanceIds: aws.StringSlice([]string{*instance.InstanceId}),
})
if err != nil {
return fmt.Errorf("failed to terminate instance: %w", err)
}
return nil
}
func removeSecurityGroup(ctx context.Context, logger logr.Logger, awsClient *awsclient.Client, opt *Options) error {
group, err := getSecurityGroup(ctx, awsClient, opt.VPCID, opt.BastionSecurityGroupName)
if err != nil {
return fmt.Errorf("failed to list security groups: %w", err)
}
// nothing to do
if group == nil {
return nil
}
logger.Info("Removing security group")
_, err = awsClient.EC2.DeleteSecurityGroupWithContext(ctx, &ec2.DeleteSecurityGroupInput{
GroupId: group.GroupId,
})
if err != nil {
return fmt.Errorf("failed to remove security group: %w", err)
}
return nil
}