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actuator.go
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actuator.go
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// Copyright © 2018 The Kubernetes Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License 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 cluster
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/elb"
"github.com/golang/glog"
"github.com/pkg/errors"
"k8s.io/client-go/tools/clientcmd"
providerconfigv1 "sigs.k8s.io/cluster-api-provider-aws/cloud/aws/providerconfig/v1alpha1"
service "sigs.k8s.io/cluster-api-provider-aws/cloud/aws/services"
"sigs.k8s.io/cluster-api-provider-aws/cloud/aws/services/certificates"
ec2svc "sigs.k8s.io/cluster-api-provider-aws/cloud/aws/services/ec2"
elbsvc "sigs.k8s.io/cluster-api-provider-aws/cloud/aws/services/elb"
clusterv1 "sigs.k8s.io/cluster-api/pkg/apis/cluster/v1alpha1"
client "sigs.k8s.io/cluster-api/pkg/client/clientset_generated/clientset/typed/cluster/v1alpha1"
controllerError "sigs.k8s.io/cluster-api/pkg/controller/error"
)
// Actuator is responsible for performing cluster reconciliation
type Actuator struct {
codec codec
clustersGetter client.ClustersGetter
servicesGetter service.Getter
}
// ActuatorParams holds parameter information for Actuator
type ActuatorParams struct {
Codec codec
ClustersGetter client.ClustersGetter
ServicesGetter service.Getter
}
// NewActuator creates a new Actuator
func NewActuator(params ActuatorParams) (*Actuator, error) {
res := &Actuator{
codec: params.Codec,
clustersGetter: params.ClustersGetter,
servicesGetter: params.ServicesGetter,
}
if res.servicesGetter == nil {
res.servicesGetter = new(defaultServicesGetter)
}
return res, nil
}
// Reconcile reconciles a cluster and is invoked by the Cluster Controller
func (a *Actuator) Reconcile(cluster *clusterv1.Cluster) (reterr error) {
glog.Infof("Reconciling cluster %v.", cluster.Name)
// Get a cluster api client for the namespace of the cluster.
clusterClient := a.clustersGetter.Clusters(cluster.Namespace)
// Load provider config.
config, err := a.loadProviderConfig(cluster)
if err != nil {
return errors.Errorf("failed to load cluster provider config: %v", err)
}
// Load provider status.
status, err := a.loadProviderStatus(cluster)
if err != nil {
return errors.Errorf("failed to load cluster provider status: %v", err)
}
// Store some config parameters in the status.
status.Region = config.Region
if len(status.CACertificate) == 0 {
caCert, caKey, err := certificates.NewCertificateAuthority()
if err != nil {
return errors.Wrap(err, "Failed to generate a CA for the control plane")
}
status.CACertificate = certificates.EncodeCertPEM(caCert)
status.CAPrivateKey = certificates.EncodePrivateKeyPEM(caKey)
}
// Always defer storing the cluster status. In case any of the calls below fails or returns an error
// the cluster state might have partial changes that should be stored.
defer func() {
// TODO(vincepri): remove this after moving to tag-discovery based approach.
if err := a.storeProviderStatus(clusterClient, cluster, status); err != nil {
glog.Errorf("failed to store provider status for cluster %q: %v", cluster.Name, err)
}
}()
// Create new aws session.
sess := a.servicesGetter.Session(config)
// Load ec2 client.
ec2 := a.servicesGetter.EC2(sess)
if err := ec2.ReconcileNetwork(cluster.Name, &status.Network); err != nil {
return errors.Errorf("unable to reconcile network: %v", err)
}
if err := ec2.ReconcileBastion(cluster.Name, config.SSHKeyName, status); err != nil {
return errors.Errorf("unable to reconcile network: %v", err)
}
// Load elb client.
elb := a.servicesGetter.ELB(sess)
if err := elb.ReconcileLoadbalancers(cluster.Name, &status.Network); err != nil {
return errors.Errorf("unable to reconcile load balancers: %v", err)
}
return nil
}
// Delete deletes a cluster and is invoked by the Cluster Controller
func (a *Actuator) Delete(cluster *clusterv1.Cluster) error {
glog.Infof("Deleting cluster %v.", cluster.Name)
// Get a cluster api client for the namespace of the cluster.
clusterClient := a.clustersGetter.Clusters(cluster.Namespace)
// Load provider config.
config, err := a.loadProviderConfig(cluster)
if err != nil {
return errors.Errorf("failed to load cluster provider config: %v", err)
}
// Load provider status.
status, err := a.loadProviderStatus(cluster)
if err != nil {
return errors.Errorf("failed to load cluster provider status: %v", err)
}
// Store some config parameters in the status.
status.Region = config.Region
// Always defer storing the cluster status. In case any of the calls below fails or returns an error
// the cluster state might have partial changes that should be stored.
defer func() {
// TODO(vincepri): remove this after moving to tag-discovery based approach.
if err := a.storeProviderStatus(clusterClient, cluster, status); err != nil {
glog.Errorf("failed to store provider status for cluster %q: %v", cluster.Name, err)
}
}()
// Create new aws session.
sess := a.servicesGetter.Session(config)
// Load ec2 client.
ec2 := a.servicesGetter.EC2(sess)
// Load elb client.
elb := a.servicesGetter.ELB(sess)
if err := elb.DeleteLoadbalancers(cluster.Name, &status.Network); err != nil {
return errors.Errorf("unable to delete load balancers: %v", err)
}
if err := ec2.DeleteBastion(cluster.Name, status); err != nil {
return errors.Errorf("unable to delete bastion: %v", err)
}
if err := ec2.DeleteNetwork(cluster.Name, &status.Network); err != nil {
glog.Errorf("Error deleting cluster %v: %v.", cluster.Name, err)
return &controllerError.RequeueAfterError{
RequeueAfter: 5 * 1000 * 1000 * 1000,
}
}
return nil
}
// GetIP returns the IP of a machine, but this is going away.
func (a *Actuator) GetIP(cluster *clusterv1.Cluster, machine *clusterv1.Machine) (string, error) {
// Load provider status.
status, err := a.loadProviderStatus(cluster)
if err != nil {
return "", errors.Errorf("failed to load cluster provider status: %v", err)
}
if status.Network.APIServerELB.DNSName != "" {
return status.Network.APIServerELB.DNSName, nil
}
// Load provider config.
config, err := a.loadProviderConfig(cluster)
if err != nil {
return "", errors.Errorf("failed to load cluster provider config: %v", err)
}
sess := a.servicesGetter.Session(config)
elb := a.servicesGetter.ELB(sess)
dnsName, err := elb.GetAPIServerDNSName(cluster.Name)
if err != nil {
return "", errors.Wrap(err, "failed to get DNS name for load balancer")
}
return dnsName, nil
}
// GetKubeConfig returns the kubeconfig after the bootstrap process is complete.
func (a *Actuator) GetKubeConfig(cluster *clusterv1.Cluster, machine *clusterv1.Machine) (string, error) {
// Load provider status.
status, err := a.loadProviderStatus(cluster)
if err != nil {
return "", errors.Errorf("failed to load cluster provider status: %v", err)
}
cert, err := certificates.DecodeCertPEM(status.CACertificate)
if err != nil {
return "", errors.Wrap(err, "failed to decode CA Cert")
}
if cert == nil {
return "", errors.New("certificate not found in status")
}
key, err := certificates.DecodePrivateKeyPEM(status.CAPrivateKey)
if err != nil {
return "", errors.Wrap(err, "failed to decode private key")
}
if key == nil {
return "", errors.New("key not found in status")
}
dnsName, err := a.GetIP(cluster, machine)
if err != nil {
return "", errors.Wrap(err, "failed to get DNS address")
}
server := fmt.Sprintf("https://%s:6443", dnsName)
cfg, err := certificates.NewKubeconfig(server, cert, key)
if err != nil {
return "", errors.Wrap(err, "failed to generate a kubeconfig")
}
yaml, err := clientcmd.Write(*cfg)
if err != nil {
return "", errors.Wrap(err, "failed to serialize config to yaml")
}
return string(yaml), nil
}
func (a *Actuator) loadProviderConfig(cluster *clusterv1.Cluster) (*providerconfigv1.AWSClusterProviderConfig, error) {
providerConfig := &providerconfigv1.AWSClusterProviderConfig{}
err := a.codec.DecodeFromProviderConfig(cluster.Spec.ProviderConfig, providerConfig)
return providerConfig, err
}
func (a *Actuator) loadProviderStatus(cluster *clusterv1.Cluster) (*providerconfigv1.AWSClusterProviderStatus, error) {
providerStatus := &providerconfigv1.AWSClusterProviderStatus{}
err := a.codec.DecodeProviderStatus(cluster.Status.ProviderStatus, providerStatus)
return providerStatus, err
}
func (a *Actuator) storeProviderStatus(clusterClient client.ClusterInterface, cluster *clusterv1.Cluster, status *providerconfigv1.AWSClusterProviderStatus) error {
raw, err := a.codec.EncodeProviderStatus(status)
if err != nil {
return errors.Errorf("failed to encode provider status: %v", err)
}
cluster.Status.ProviderStatus = raw
if _, err := clusterClient.UpdateStatus(cluster); err != nil {
return err
}
return nil
}
type defaultServicesGetter struct{}
func (d *defaultServicesGetter) Session(clusterConfig *providerconfigv1.AWSClusterProviderConfig) *session.Session {
return session.Must(session.NewSession(aws.NewConfig().WithRegion(clusterConfig.Region)))
}
func (d *defaultServicesGetter) EC2(session *session.Session) service.EC2Interface {
return ec2svc.NewService(ec2.New(session))
}
func (d *defaultServicesGetter) ELB(session *session.Session) service.ELBInterface {
return elbsvc.NewService(elb.New(session))
}