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clean.go
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clean.go
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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package ecs
import (
"errors"
"fmt"
"log"
"os"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ecs"
)
const (
Type = "ecs"
clusterPrefix = "aoc-testing"
taskDefPrefix = "taskdef"
)
var logger = log.New(os.Stdout, fmt.Sprintf("[%s] ", Type), log.LstdFlags)
var errServiceTooNewError = errors.New("service is not past the expiration date")
func Clean(sess *session.Session, expirationDate time.Time) error {
logger.Printf("Begin to clean ECS Task Definitions")
client := ecs.New(sess)
var nextToken *string
for {
lci := &ecs.ListClustersInput{NextToken: nextToken}
lco, err := client.ListClusters(lci)
if err != nil {
return err
}
dci := &ecs.DescribeClustersInput{Clusters: lco.ClusterArns}
dco, err := client.DescribeClusters(dci)
if err != nil {
return err
}
for _, cluster := range dco.Clusters {
if strings.HasPrefix(*cluster.ClusterName, clusterPrefix) {
/**
I would prefer to use multi errors here instead of exiting immediately. This would allow us to
build a list of errors and still iterate through the clusters rather than failing fast.
This should be a follow-on fix.
As of now: failing fast gives us better insight into edge cases where the resource cleaner may be
failing rather than having to log dive a successful run.
TODO: use mutli errs and don't fail fast
*/
if *cluster.ActiveServicesCount > 0 {
err := deleteServices(client, expirationDate, cluster.ClusterArn)
if err != nil && errors.Is(err, errServiceTooNewError) {
logger.Printf("skipping %s deletion: cluster service not past expiration date",
*cluster.ClusterName)
continue
} else if err != nil {
return fmt.Errorf("unable to remove all services in cluster %s due to %w", *cluster.ClusterName, err)
}
}
logger.Printf("Trying to delete cluster %s", *cluster.ClusterName)
dlci := &ecs.DeleteClusterInput{Cluster: cluster.ClusterArn}
if _, err = client.DeleteCluster(dlci); err != nil {
return fmt.Errorf("unable to delete cluster %s due to %w", *cluster.ClusterName, err)
} else {
logger.Printf("Deleted cluster %s successfully", *cluster.ClusterName)
}
}
}
if lco.NextToken == nil {
break
}
nextToken = lco.NextToken
}
return nil
}
func deleteServices(client *ecs.ECS, expirationDate time.Time, clusterArn *string) error {
var nextToken *string
var remainingServices int
for {
lsi := &ecs.ListServicesInput{Cluster: clusterArn, NextToken: nextToken}
lso, err := client.ListServices(lsi)
if err != nil {
return err
}
dsi := &ecs.DescribeServicesInput{Cluster: clusterArn, Services: lso.ServiceArns}
dso, err := client.DescribeServices(dsi)
if err != nil {
return err
}
remainingServices += len(dso.Services)
for _, service := range dso.Services {
if expirationDate.After(*service.CreatedAt) {
logger.Printf("Trying to delete service %s created on %v", *service.ServiceName, *service.CreatedAt)
if service.TaskDefinition != nil {
if err = deleteTaskDefinition(client, expirationDate, service.TaskDefinition); err != nil {
return err
}
}
dlsi := &ecs.DeleteServiceInput{Cluster: clusterArn, Service: service.ServiceName, Force: aws.Bool(true)}
if _, err = client.DeleteService(dlsi); err != nil {
return err
}
logger.Printf("Deleted service %s successfully", *service.ServiceName)
remainingServices--
} else {
return errServiceTooNewError
}
}
if lso.NextToken == nil {
break
}
nextToken = lso.NextToken
}
if remainingServices > 0 {
return fmt.Errorf("failed to delete all services")
}
return nil
}
func deleteTaskDefinition(client *ecs.ECS, expirationDate time.Time, taskDefinitionArn *string) error {
dtdi := &ecs.DescribeTaskDefinitionInput{TaskDefinition: taskDefinitionArn}
dtdo, err := client.DescribeTaskDefinition(dtdi)
if err != nil {
return err
}
taskDefinition := dtdo.TaskDefinition
if strings.HasPrefix(*taskDefinition.Family, taskDefPrefix) && expirationDate.After(*taskDefinition.RegisteredAt) {
logger.Printf("Trying to de-register task definition %s registered on %v", *taskDefinition.Family, *taskDefinition.RegisteredAt)
drtdi := &ecs.DeregisterTaskDefinitionInput{TaskDefinition: taskDefinitionArn}
if _, err = client.DeregisterTaskDefinition(drtdi); err != nil {
return err
}
logger.Printf("De-registered task definition %s successfully", *taskDefinition.Family)
}
return nil
}