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secretcontroller.go
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/
secretcontroller.go
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// Copyright 2018 Istio 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 secretcontroller
import (
"fmt"
"time"
corev1 "k8s.io/api/core/v1"
meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/workqueue"
"istio.io/istio/pkg/kube"
"istio.io/istio/pkg/log"
)
const (
mcLabel = "istio/multiCluster"
maxRetries = 5
)
// LoadKubeConfig is a unit test override variable for loading the k8s config.
// DO NOT USE - TEST ONLY.
var LoadKubeConfig = clientcmd.Load
var ValidateClientConfig = clientcmd.Validate
// CreateInterfaceFromClusterConfig is a unit test override variable for interface create.
// DO NOT USE - TEST ONLY.
var CreateInterfaceFromClusterConfig = kube.CreateInterfaceFromClusterConfig
// addSecretCallback prototype for the add secret callback function.
type addSecretCallback func(clientset kubernetes.Interface, dataKey string) error
// removeSecretCallback prototype for the remove secret callback function.
type removeSecretCallback func(dataKey string) error
// Controller is the controller implementation for Secret resources
type Controller struct {
kubeclientset kubernetes.Interface
namespace string
cs *ClusterStore
queue workqueue.RateLimitingInterface
informer cache.SharedIndexInformer
addCallback addSecretCallback
removeCallback removeSecretCallback
}
// RemoteCluster defines cluster structZZ
type RemoteCluster struct {
secretName string
}
// ClusterStore is a collection of clusters
type ClusterStore struct {
remoteClusters map[string]*RemoteCluster
}
// newClustersStore initializes data struct to store clusters information
func newClustersStore() *ClusterStore {
remoteClusters := make(map[string]*RemoteCluster)
return &ClusterStore{
remoteClusters: remoteClusters,
}
}
// NewController returns a new secret controller
func NewController(
kubeclientset kubernetes.Interface,
namespace string,
cs *ClusterStore,
addCallback addSecretCallback,
removeCallback removeSecretCallback) *Controller {
secretsInformer := cache.NewSharedIndexInformer(
&cache.ListWatch{
ListFunc: func(opts meta_v1.ListOptions) (runtime.Object, error) {
opts.LabelSelector = mcLabel + "=true"
return kubeclientset.CoreV1().Secrets(namespace).List(opts)
},
WatchFunc: func(opts meta_v1.ListOptions) (watch.Interface, error) {
opts.LabelSelector = mcLabel + "=true"
return kubeclientset.CoreV1().Secrets(namespace).Watch(opts)
},
},
&corev1.Secret{}, 0, cache.Indexers{},
)
queue := workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter())
controller := &Controller{
kubeclientset: kubeclientset,
namespace: namespace,
cs: cs,
informer: secretsInformer,
queue: queue,
addCallback: addCallback,
removeCallback: removeCallback,
}
log.Info("Setting up event handlers")
secretsInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
log.Infof("Processing add: %s", key)
if err == nil {
queue.Add(key)
}
},
DeleteFunc: func(obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
log.Infof("Processing delete: %s", key)
if err == nil {
queue.Add(key)
}
},
})
return controller
}
// Run starts the controller until it receives a message over stopCh
func (c *Controller) Run(stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
defer c.queue.ShutDown()
log.Info("Starting Secrets controller")
go c.informer.Run(stopCh)
// Wait for the caches to be synced before starting workers
log.Info("Waiting for informer caches to sync")
if !cache.WaitForCacheSync(stopCh, c.informer.HasSynced) {
utilruntime.HandleError(fmt.Errorf("timed out waiting for caches to sync"))
return
}
wait.Until(c.runWorker, 5*time.Second, stopCh)
}
// StartSecretController creates the secret controller.
func StartSecretController(k8s kubernetes.Interface,
addCallback addSecretCallback,
removeCallback removeSecretCallback,
namespace string) error {
stopCh := make(chan struct{})
clusterStore := newClustersStore()
controller := NewController(k8s, namespace, clusterStore, addCallback, removeCallback)
go controller.Run(stopCh)
return nil
}
func (c *Controller) runWorker() {
for c.processNextItem() {
// continue looping
}
}
func (c *Controller) processNextItem() bool {
secretName, quit := c.queue.Get()
if quit {
return false
}
defer c.queue.Done(secretName)
err := c.processItem(secretName.(string))
if err == nil {
// No error, reset the ratelimit counters
c.queue.Forget(secretName)
} else if c.queue.NumRequeues(secretName) < maxRetries {
log.Errorf("Error processing %s (will retry): %v", secretName, err)
c.queue.AddRateLimited(secretName)
} else {
log.Errorf("Error processing %s (giving up): %v", secretName, err)
c.queue.Forget(secretName)
utilruntime.HandleError(err)
}
return true
}
func (c *Controller) processItem(secretName string) error {
obj, exists, err := c.informer.GetIndexer().GetByKey(secretName)
if err != nil {
return fmt.Errorf("error fetching object %s error: %v", secretName, err)
}
if exists {
c.addMemberCluster(secretName, obj.(*corev1.Secret))
} else {
c.deleteMemberCluster(secretName)
}
return nil
}
func (c *Controller) addMemberCluster(secretName string, s *corev1.Secret) {
for clusterID, kubeConfig := range s.Data {
// clusterID must be unique even across multiple secrets
if _, ok := c.cs.remoteClusters[clusterID]; !ok {
if len(kubeConfig) == 0 {
log.Infof("Data '%s' in the secret %s in namespace %s is empty, and disregarded ",
clusterID, secretName, s.Namespace)
continue
}
clientConfig, err := LoadKubeConfig(kubeConfig)
if err != nil {
log.Infof("Data '%s' in the secret %s in namespace %s is not a kubeconfig: %v",
clusterID, secretName, s.Namespace, err)
continue
}
if err := ValidateClientConfig(*clientConfig); err != nil {
log.Errorf("Data '%s' in the secret %s in namespace %s is not a valid kubeconfig: %v",
clusterID, secretName, s.Namespace, err)
continue
}
log.Infof("Adding new cluster member: %s", clusterID)
c.cs.remoteClusters[clusterID] = &RemoteCluster{}
c.cs.remoteClusters[clusterID].secretName = secretName
client, err := CreateInterfaceFromClusterConfig(clientConfig)
if err != nil {
log.Errorf("error during create of kubernetes client interface for cluster: %s %v", clusterID, err)
continue
}
err = c.addCallback(client, clusterID)
if err != nil {
log.Errorf("error during create of clusterID: %s %v", clusterID, err)
}
} else {
log.Infof("Cluster %s in the secret %s in namespace %s already exists",
clusterID, c.cs.remoteClusters[clusterID].secretName, s.Namespace)
}
}
log.Infof("Number of remote clusters: %d", len(c.cs.remoteClusters))
}
func (c *Controller) deleteMemberCluster(secretName string) {
for clusterID, cluster := range c.cs.remoteClusters {
if cluster.secretName == secretName {
log.Infof("Deleting cluster member: %s", clusterID)
err := c.removeCallback(clusterID)
if err != nil {
log.Errorf("error during cluster delete: %s %v", clusterID, err)
}
delete(c.cs.remoteClusters, clusterID)
}
}
log.Infof("Number of remote clusters: %d", len(c.cs.remoteClusters))
}