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kops.go
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kops.go
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package kops
import (
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
"github.com/kris-nova/logger"
"github.com/pkg/errors"
api "github.com/weaveworks/eksctl/pkg/apis/eksctl.io/v1alpha5"
"github.com/weaveworks/eksctl/pkg/vpc"
"k8s.io/kops/pkg/resources/aws"
"k8s.io/kops/upup/pkg/fi/cloudup/awsup"
)
// Wrapper for interacting with a kops cluster
type Wrapper struct {
clusterName string
cloud awsup.AWSCloud
}
// NewWrapper constructs a kops wrapper for a given EKS cluster config and kops cluster
func NewWrapper(region, kopsClusterName string) (*Wrapper, error) {
cloud, err := awsup.NewAWSCloud(region, nil)
if err != nil {
return nil, err
}
return &Wrapper{kopsClusterName, cloud}, nil
}
func (k *Wrapper) isOwned(t *ec2.Tag) bool {
return *t.Key == "kubernetes.io/cluster/"+k.clusterName && *t.Value == "owned"
}
func (k *Wrapper) topologyOf(s *ec2.Subnet) api.SubnetTopology {
for _, t := range s.Tags {
if *t.Key == "SubnetType" && *t.Value == "Private" {
return api.SubnetTopologyPrivate
}
}
return api.SubnetTopologyPublic // "Utility", "Public" or unspecified
}
// UseVPC finds VPC and subnets that give kops cluster uses and add those to EKS cluster config
func (k *Wrapper) UseVPC(ec2API ec2iface.EC2API, spec *api.ClusterConfig) error {
spec.VPC.CIDR = nil // ensure to reset the CIDR
allSubnets, err := aws.ListSubnets(k.cloud, k.clusterName)
if err != nil {
return err
}
subnetsByTopology := map[api.SubnetTopology][]*ec2.Subnet{
api.SubnetTopologyPrivate: {},
api.SubnetTopologyPublic: {},
}
for _, subnet := range allSubnets {
if subnet.Type != ec2.ResourceTypeSubnet {
continue
}
subnet := subnet.Obj.(*ec2.Subnet)
for _, tag := range subnet.Tags {
if k.isOwned(tag) {
t := k.topologyOf(subnet)
subnetsByTopology[t] = append(subnetsByTopology[t], subnet)
}
}
}
for t, subnets := range subnetsByTopology {
if err := vpc.ImportSubnets(ec2API, spec, t, subnets); err != nil {
return err
}
}
logger.Debug("subnets = %#v", spec.VPC.Subnets)
if err := spec.HasSufficientSubnets(); err != nil {
return errors.Wrapf(err, "using VPC from kops cluster %q", k.clusterName)
}
return nil
}