/
eks.go
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/
eks.go
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package eks
import (
"fmt"
"os/exec"
"strings"
"github.com/aws/aws-sdk-go/aws/client"
session2 "github.com/jenkins-x/jx/v2/pkg/cloud/amazon/session"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/cloudformation"
"github.com/aws/aws-sdk-go/service/eks"
"github.com/aws/aws-sdk-go/service/eks/eksiface"
"github.com/jenkins-x/jx/v2/pkg/cluster"
"github.com/pkg/errors"
)
// eksAPIHandler contains some functions to interact with and serves as an abstraction of the EKS API
type eksAPIHandler struct {
eks eksiface.EKSAPI
}
// NewEKSAPIHandler will return an eksAPIHandler with configured credentials
func NewEKSAPIHandler(awsSession client.ConfigProvider, eksapi ...eksiface.EKSAPI) (*eksAPIHandler, error) {
if len(eksapi) == 1 {
return &eksAPIHandler{
eks: eksapi[0],
}, nil
}
return &eksAPIHandler{
eks: eks.New(awsSession),
}, nil
}
// EksClusterExists checks if EKS cluster with given name exists in given region.
func (e *eksAPIHandler) EksClusterExists(clusterName string, profile string, region string) (bool, error) {
region, err := session2.ResolveRegion(profile, region)
if err != nil {
return false, err
}
cmd := exec.Command("eksctl", "get", "cluster", "--region", region) //nolint:gosec
output, err := cmd.CombinedOutput()
if err != nil {
return false, err
}
for i, line := range strings.Split(string(output), "\n") {
if i == 0 {
continue
}
if strings.HasPrefix(line, clusterName+"\t") {
return true, nil
}
}
return false, nil
}
// DescribeCluster will attempt to describe the given cluster and return a simplified cluster.Cluster struct
func (e *eksAPIHandler) DescribeCluster(clusterName string) (*cluster.Cluster, string, error) {
output, err := e.eks.DescribeCluster(&eks.DescribeClusterInput{
Name: aws.String(clusterName),
})
if err != nil {
return nil, "", err
}
cl := &cluster.Cluster{
Name: *output.Cluster.Name,
Labels: aws.StringValueMap(output.Cluster.Tags),
Status: *output.Cluster.Status,
}
if output.Cluster.Endpoint != nil {
cl.Location = *output.Cluster.Endpoint
}
return cl, *output.Cluster.Arn, err
}
// ListClusters will list all clusters existing in configured region and describe each one to return enhanced data
func (e *eksAPIHandler) ListClusters() ([]*cluster.Cluster, error) {
var nextToken *string = nil
var clusters []*cluster.Cluster
for {
output, err := e.eks.ListClusters(&eks.ListClustersInput{
NextToken: nextToken,
})
if err != nil {
return nil, err
}
for _, c := range output.Clusters {
describeClusters, _, err := e.DescribeCluster(*c)
if err != nil {
return nil, err
}
clusters = append(clusters, describeClusters)
}
if output.NextToken == nil {
return clusters, err
}
if output.NextToken != nil {
nextToken = output.NextToken
}
}
}
func (e eksAPIHandler) GetClusterAsEKSCluster(clusterName string) (*eks.Cluster, error) {
output, err := e.eks.DescribeCluster(&eks.DescribeClusterInput{
Name: aws.String(clusterName),
})
if err != nil {
return nil, errors.Wrapf(err, "error describing EKS cluster %s", clusterName)
}
return output.Cluster, nil
}
// AddTagsToCluster adds tags to an EKS cluster
func (e *eksAPIHandler) AddTagsToCluster(clusterName string, tags map[string]*string) error {
_, clusterARN, err := e.DescribeCluster(clusterName)
if err != nil {
return err
}
_, err = e.eks.TagResource(&eks.TagResourceInput{
ResourceArn: aws.String(clusterARN),
Tags: tags,
})
if err != nil {
return err
}
return nil
}
// EksClusterObsoleteStackExists detects if there is obsolete CloudFormation stack for given EKS cluster.
//
// If EKS cluster creation process is interrupted, there will be CloudFormation stack in ROLLBACK_COMPLETE state left.
// Such dead stack prevents eksctl from creating cluster with the same name. This is common activity then to remove stacks
// like this and this function performs this action.
func (e *eksAPIHandler) EksClusterObsoleteStackExists(clusterName string, profile string, region string) (bool, error) {
session, err := session2.NewAwsSession(profile, region)
if err != nil {
return false, err
}
cloudformationService := cloudformation.New(session)
stacks, err := cloudformationService.ListStacks(&cloudformation.ListStacksInput{
StackStatusFilter: []*string{aws.String("ROLLBACK_COMPLETE")},
})
if err != nil {
return false, err
}
for _, stack := range stacks.StackSummaries {
if *stack.StackName == EksctlStackName(clusterName) {
return true, nil
}
}
return false, nil
}
// CleanUpObsoleteEksClusterStack removes dead eksctl CloudFormation stack associated with given EKS cluster name.
func (e *eksAPIHandler) CleanUpObsoleteEksClusterStack(clusterName string, profile string, region string) error {
session, err := session2.NewAwsSession(profile, region)
if err != nil {
return err
}
cloudformationService := cloudformation.New(session)
_, err = cloudformationService.DeleteStack(&cloudformation.DeleteStackInput{
StackName: aws.String(EksctlStackName(clusterName)),
})
return err
}
// EksctlStackName generates CloudFormation stack name for given EKS cluster name. This function follows eksctl
// naming convention.
func EksctlStackName(clusterName string) string {
return fmt.Sprintf("eksctl-%s-cluster", clusterName)
}