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globaldns_provider.go
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/
globaldns_provider.go
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package globaldns
import (
"bytes"
"context"
"fmt"
"text/template"
"github.com/rancher/rancher/pkg/controllers/management/globalnamespacerbac"
"github.com/rancher/rancher/pkg/namespace"
"github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/rancher/types/config"
"github.com/sirupsen/logrus"
"k8s.io/api/core/v1"
"k8s.io/api/extensions/v1beta1"
k8srbacV1 "k8s.io/api/rbac/v1beta1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes/scheme"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
extv1beta1 "k8s.io/client-go/kubernetes/typed/extensions/v1beta1"
rbacv1 "k8s.io/client-go/kubernetes/typed/rbac/v1beta1"
)
const (
Route53DNSProvider = "route53"
CloudflareDNSProvider = "cloudflare"
GlobaldnsProviderLauncher = "mgmt-global-dns-provider-launcher"
)
type ProviderLauncher struct {
GlobalDNSproviders v3.GlobalDNSProviderInterface
GlobalDNSproviderLister v3.GlobalDNSProviderLister
Deployments extv1beta1.DeploymentInterface
ServiceAccounts corev1.ServiceAccountInterface
ClusterRoles rbacv1.ClusterRoleInterface
ClusterRoleBindings rbacv1.ClusterRoleBindingInterface
managementContext *config.ManagementContext
}
func newGlobalDNSProviderLauncher(ctx context.Context, mgmt *config.ManagementContext) *ProviderLauncher {
n := &ProviderLauncher{
GlobalDNSproviders: mgmt.Management.GlobalDNSProviders(namespace.GlobalNamespace),
GlobalDNSproviderLister: mgmt.Management.GlobalDNSProviders(namespace.GlobalNamespace).Controller().Lister(),
Deployments: mgmt.K8sClient.ExtensionsV1beta1().Deployments(namespace.GlobalNamespace),
ServiceAccounts: mgmt.K8sClient.CoreV1().ServiceAccounts(namespace.GlobalNamespace),
ClusterRoles: mgmt.K8sClient.RbacV1beta1().ClusterRoles(),
ClusterRoleBindings: mgmt.K8sClient.RbacV1beta1().ClusterRoleBindings(),
managementContext: mgmt,
}
return n
}
//sync is called periodically and on real updates
func (n *ProviderLauncher) sync(key string, obj *v3.GlobalDNSProvider) (runtime.Object, error) {
if obj == nil || obj.DeletionTimestamp != nil {
return nil, nil
}
metaAccessor, err := meta.Accessor(obj)
if err != nil {
return nil, err
}
creatorID, ok := metaAccessor.GetAnnotations()[globalnamespacerbac.CreatorIDAnn]
if !ok {
return nil, fmt.Errorf("GlobalDNS %v has no creatorId annotation", metaAccessor.GetName())
}
//check if provider already running for this GlobalDNSProvider.
if n.isProviderAlreadyRunning(obj) {
logrus.Infof("GlobaldnsProviderLauncher: Found a running external-dns deployment for this provider %v , skip creating a new one", obj.Name)
return nil, nil
}
//create svcAcct and rbac entities if not created already
err = n.createExternalDNSServiceAccount()
if err != nil {
return nil, err
}
err = n.createExternalDNSClusterRole()
if err != nil {
return nil, err
}
err = n.createExternalDNSClusterRoleBinding()
if err != nil {
return nil, err
}
//handle external-dns deployment
if obj.Spec.Route53ProviderConfig != nil {
return n.handleRoute53Provider(obj)
}
if obj.Spec.CloudflareProviderConfig != nil {
return n.handleCloudflareProvider(obj)
}
if err := globalnamespacerbac.CreateRoleAndRoleBinding(globalnamespacerbac.GlobalDNSProviderResource, obj.Name,
obj.UID, obj.Spec.Members, creatorID, n.managementContext); err != nil {
return nil, err
}
return nil, nil
}
func (n *ProviderLauncher) handleRoute53Provider(obj *v3.GlobalDNSProvider) (runtime.Object, error) {
//create external-dns route53 provider
data := map[string]interface{}{
"awsAccessKey": obj.Spec.Route53ProviderConfig.AccessKey,
"awsSecretKey": obj.Spec.Route53ProviderConfig.SecretKey,
"route53Domain": obj.Spec.Route53ProviderConfig.RootDomain,
"deploymentName": obj.Name,
}
if err := n.createExternalDNSDeployment(obj, data, Route53DeploymentTemplate, Route53DNSProvider); err != nil {
return nil, err
}
return nil, nil
}
func (n *ProviderLauncher) handleCloudflareProvider(obj *v3.GlobalDNSProvider) (runtime.Object, error) {
//create external-dns cloudflare provider
data := map[string]interface{}{
"apiKey": obj.Spec.CloudflareProviderConfig.APIKey,
"apiEmail": obj.Spec.CloudflareProviderConfig.APIEmail,
"cloudflareDomain": obj.Spec.CloudflareProviderConfig.RootDomain,
"deploymentName": obj.Name,
}
if err := n.createExternalDNSDeployment(obj, data, CloudflareDeploymentTemplate, CloudflareDNSProvider); err != nil {
return nil, err
}
return nil, nil
}
func (n *ProviderLauncher) isProviderAlreadyRunning(obj *v3.GlobalDNSProvider) bool {
existingDep, err := n.Deployments.Get(obj.Name, metav1.GetOptions{})
if (err != nil && k8serrors.IsNotFound(err)) || existingDep == nil {
return false
} else if err != nil && !k8serrors.IsNotFound(err) {
logrus.Errorf("GlobaldnsProviderLauncher: Error listing external-dns %v Deployment %v", obj.Name, err)
return false
}
return true
}
func (n *ProviderLauncher) createExternalDNSServiceAccount() error {
decode := scheme.Codecs.UniversalDeserializer().Decode
//create svcAcct and bindings
_, err := n.ServiceAccounts.Get("external-dns", metav1.GetOptions{})
if err != nil && !k8serrors.IsNotFound(err) {
return fmt.Errorf("GlobaldnsProviderLauncher: Error listing external-dns ServiceAccount %v", err)
} else if k8serrors.IsNotFound(err) {
svcAcctObj, _, err := decode([]byte(ExternalDNSServiceAcct), nil, nil)
if err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher: Error decoding external-dns ServiceAccount to Kubernetes Object: %v", err)
}
svcAcct := svcAcctObj.(*v1.ServiceAccount)
_, err = n.ServiceAccounts.Create(svcAcct)
if err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher: Error creating external-dns ServiceAccount: %v ", err)
}
}
return nil
}
func (n *ProviderLauncher) createExternalDNSClusterRole() error {
decode := scheme.Codecs.UniversalDeserializer().Decode
_, err := n.ClusterRoles.Get("external-dns", metav1.GetOptions{})
if err != nil && !k8serrors.IsNotFound(err) {
return fmt.Errorf("GlobaldnsProviderLauncher: Error listing external-dns ClusterRole %v", err)
} else if k8serrors.IsNotFound(err) {
crObj, _, err := decode([]byte(ExternalDNSClusterRole), nil, nil)
if err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher: Error decoding external-dns ClusterRole to Kubernetes Object: %v", err)
}
cr := crObj.(*k8srbacV1.ClusterRole)
_, err = n.ClusterRoles.Create(cr)
if err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher: Error creating external-dns ClusterRole: %v ", err)
}
}
return nil
}
func (n *ProviderLauncher) createExternalDNSClusterRoleBinding() error {
decode := scheme.Codecs.UniversalDeserializer().Decode
_, err := n.ClusterRoleBindings.Get("external-dns-viewer", metav1.GetOptions{})
if err != nil && !k8serrors.IsNotFound(err) {
return fmt.Errorf("GlobaldnsProviderLauncher: Error listing external-dns-viewer ClusterRoleBinding %v", err)
} else if k8serrors.IsNotFound(err) {
crBindingObj, _, err := decode([]byte(ExternalDNSClusterRoleBinding), nil, nil)
if err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher; Error decoding external-dns-viewer ClusterRoleBinding to Kubernetes Object: %v", err)
}
crBinding := crBindingObj.(*k8srbacV1.ClusterRoleBinding)
_, err = n.ClusterRoleBindings.Create(crBinding)
if err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher: Error creating external-dns-viewer ClusterRoleBinding: %v ", err)
}
}
return nil
}
func (n *ProviderLauncher) createExternalDNSDeployment(obj *v3.GlobalDNSProvider, data map[string]interface{}, globalDNSTemplate, globalDNSName string) error {
//create external-dns provider
externalDNSTemplate := template.Must(template.New(globalDNSName).Parse(globalDNSTemplate))
var output bytes.Buffer
//create external-dns cloudflare provider
if err := externalDNSTemplate.Execute(&output, data); err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher: Error parsing the external-dns/%s deployment template: %v", globalDNSName, err)
}
decode := scheme.Codecs.UniversalDeserializer().Decode
deployObj, _, err := decode(output.Bytes(), nil, nil)
if err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher: Error decoding external-dns/%s deployment template to Kubernetes Object: %v", globalDNSName, err)
}
deployment := deployObj.(*v1beta1.Deployment)
//set ownerRef to the dnsProvider CR
controller := true
ownerRef := []metav1.OwnerReference{{
Name: obj.Name,
APIVersion: "v3",
UID: obj.UID,
Kind: obj.Kind,
Controller: &controller,
}}
deployment.ObjectMeta.OwnerReferences = ownerRef
deploymentCreated, err := n.Deployments.Create(deployment)
if err != nil {
return fmt.Errorf("GlobaldnsProviderLauncher: Error creating external-dns deployment for %s provider: %v ", globalDNSName, err)
}
logrus.Infof("GlobaldnsProviderLauncher: Created %s external-dns provider deployment %v", globalDNSName, deploymentCreated.Name)
return nil
}