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/
agent_controller.go
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/
agent_controller.go
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// Copyright 2018 Oracle and/or its affiliates. All rights reserved.
//
// 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 backup
import (
"context"
"fmt"
"sync"
"time"
"github.com/golang/glog"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
field "k8s.io/apimachinery/pkg/util/validation/field"
wait "k8s.io/apimachinery/pkg/util/wait"
corev1informers "k8s.io/client-go/informers/core/v1"
kubernetes "k8s.io/client-go/kubernetes"
scheme "k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
corev1listers "k8s.io/client-go/listers/core/v1"
cache "k8s.io/client-go/tools/cache"
record "k8s.io/client-go/tools/record"
workqueue "k8s.io/client-go/util/workqueue"
backuputil "github.com/oracle/mysql-operator/pkg/api/backup"
"github.com/oracle/mysql-operator/pkg/apis/mysql/v1alpha1"
backuphandler "github.com/oracle/mysql-operator/pkg/backup"
executor "github.com/oracle/mysql-operator/pkg/backup/executor"
controllerutils "github.com/oracle/mysql-operator/pkg/controllers/util"
clientset "github.com/oracle/mysql-operator/pkg/generated/clientset/versioned/typed/mysql/v1alpha1"
informersv1alpha1 "github.com/oracle/mysql-operator/pkg/generated/informers/externalversions/mysql/v1alpha1"
listersv1alpha1 "github.com/oracle/mysql-operator/pkg/generated/listers/mysql/v1alpha1"
kubeutil "github.com/oracle/mysql-operator/pkg/util/kube"
metrics "github.com/oracle/mysql-operator/pkg/util/metrics"
)
const agentControllerAgentName = "agent-backup-controller"
// AgentController handles the excution of Backups on a specific
// mysql-agent. It is run in each mysql-agent.
type AgentController struct {
// podName is the name of the pod the controller is running in.
podName string
kubeClient kubernetes.Interface
client clientset.BackupsGetter
syncHandler func(key string) error
// podLister is able to list/get Pods from a shared informer's store.
podLister corev1listers.PodLister
// podListerSynced returns true if the Pod shared informer has synced at
// least once.
podListerSynced cache.InformerSynced
// clusterLister is able to list/get Clusters from a shared informer's
// store.
clusterLister listersv1alpha1.ClusterLister
// clusterListerSynced returns true if the Cluster shared informer has
// synced at least once.
clusterListerSynced cache.InformerSynced
// backupLister is able to list/get Backups from a shared informer's
// store.
backupLister listersv1alpha1.BackupLister
// backupListerSynced returns true if the Backup shared informer has
// synced at least once.
backupListerSynced cache.InformerSynced
queue workqueue.RateLimitingInterface
// recorder is an event recorder for recording Event resources to the
// Kubernetes API.
recorder record.EventRecorder
// conditionUpdater updates the conditions of Backups.
conditionUpdater ConditionUpdater
}
// NewAgentController constructs a new AgentController.
func NewAgentController(
kubeClient kubernetes.Interface,
client clientset.BackupsGetter,
backupInformer informersv1alpha1.BackupInformer,
clusterInformer informersv1alpha1.ClusterInformer,
podInformer corev1informers.PodInformer,
podName string,
) *AgentController {
// Create event broadcaster.
glog.V(4).Info("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.Infof)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: agentControllerAgentName})
c := &AgentController{
podName: podName,
kubeClient: kubeClient,
client: client,
clusterLister: clusterInformer.Lister(),
clusterListerSynced: clusterInformer.Informer().HasSynced,
backupLister: backupInformer.Lister(),
backupListerSynced: backupInformer.Informer().HasSynced,
podLister: podInformer.Lister(),
podListerSynced: podInformer.Informer().HasSynced,
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "backup"),
recorder: recorder,
conditionUpdater: &conditionUpdater{client: client},
}
c.syncHandler = c.processBackup
backupInformer.Informer().AddEventHandler(
cache.ResourceEventHandlerFuncs{
UpdateFunc: func(oldObj, newObj interface{}) {
new := newObj.(*v1alpha1.Backup)
_, cond := backuputil.GetBackupCondition(&new.Status, v1alpha1.BackupComplete)
if cond != nil && cond.Status == corev1.ConditionTrue {
glog.V(2).Infof("Backup %q is Complete, skipping.", kubeutil.NamespaceAndName(new))
return
}
_, cond = backuputil.GetBackupCondition(&new.Status, v1alpha1.BackupRunning)
if cond != nil && cond.Status == corev1.ConditionTrue {
glog.V(2).Infof("Backup %q is Running, skipping.", kubeutil.NamespaceAndName(new))
return
}
_, cond = backuputil.GetBackupCondition(&new.Status, v1alpha1.BackupScheduled)
if cond != nil && cond.Status == corev1.ConditionTrue && new.Spec.ScheduledMember == c.podName {
key, err := cache.MetaNamespaceKeyFunc(new)
if err != nil {
glog.Errorf("Error creating queue key, item not added to queue: %v", err)
return
}
c.queue.Add(key)
glog.V(2).Infof("Backup %q queued", kubeutil.NamespaceAndName(new))
return
}
glog.V(2).Infof("Backup %q is not Scheduled, skipping.", kubeutil.NamespaceAndName(new))
},
},
)
return c
}
// Run is a blocking function that runs the specified number of worker
// goroutines to process items in the work queue. It will return when it
// receives on the stopCh channel.
func (controller *AgentController) Run(ctx context.Context, numWorkers int) error {
var wg sync.WaitGroup
defer func() {
glog.Info("Waiting for workers to finish their work")
controller.queue.ShutDown()
// We have to wait here in the deferred function instead of at the
// bottom of the function body because we have to shut down the queue
// in order for the workers to shut down gracefully, and we want to shut
// down the queue via defer and not at the end of the body.
wg.Wait()
glog.Info("All workers have finished")
}()
glog.Info("Starting AgentController")
defer glog.Info("Shutting down AgentController")
glog.Info("Waiting for caches to sync")
if !controllerutils.WaitForCacheSync(agentControllerAgentName, ctx.Done(),
controller.clusterListerSynced,
controller.backupListerSynced,
controller.podListerSynced) {
return errors.New("timed out waiting for caches to sync")
}
glog.Info("Caches are synced")
wg.Add(numWorkers)
for i := 0; i < numWorkers; i++ {
go func() {
wait.Until(controller.runWorker, time.Second, ctx.Done())
wg.Done()
}()
}
<-ctx.Done()
return nil
}
func (controller *AgentController) runWorker() {
// Continually take items off the queue (waits if it's empty) until we get a
// shutdown signal from the queue.
for controller.processNextWorkItem() {
}
}
func (controller *AgentController) processNextWorkItem() bool {
key, quit := controller.queue.Get()
if quit {
return false
}
// Always call done on this item, since if it fails we'll add it back with
// rate-limiting below.
defer controller.queue.Done(key)
err := controller.syncHandler(key.(string))
if err == nil {
// If you had no error, tell the queue to stop tracking history for your
// key. This will reset things like failure counts for per-item rate
// limiting.
controller.queue.Forget(key)
return true
}
glog.Errorf("Error in syncHandler, re-adding %q to queue: %+v", key, err)
// We had an error processing the item so add it back into the queue for
// re-processing with rate-limiting.
controller.queue.AddRateLimited(key)
return true
}
func (controller *AgentController) processBackup(key string) error {
ns, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return errors.Wrap(err, "error splitting queue key")
}
// Get resource from store.
backup, err := controller.backupLister.Backups(ns).Get(name)
if err != nil {
return errors.Wrap(err, "error getting Backup")
}
// Don't modify items in the cache.
backup = backup.DeepCopy()
// Set defaults (incl. operator version label).
backup = backup.EnsureDefaults()
var creds *corev1.Secret
validationErr := backup.Validate()
if validationErr == nil {
// If there are no basic validation errors check the referenced
// resources exist.
validationErrs := field.ErrorList{}
fldPath := field.NewPath("spec")
// Check the referenced Cluster exists.
_, err := controller.clusterLister.Clusters(ns).Get(backup.Spec.Cluster.Name)
if err != nil {
if !apierrors.IsNotFound(err) {
return err
}
validationErrs = append(validationErrs,
field.NotFound(fldPath.Child("cluster").Child("name"), backup.Spec.Cluster.Name))
}
// TODO(apryde) when we have more storage providers this will need to be abstracted away.
creds, err = controller.kubeClient.CoreV1().Secrets(ns).Get(backup.Spec.StorageProvider.S3.CredentialsSecret.Name, metav1.GetOptions{})
if err != nil {
if !apierrors.IsNotFound(err) {
return errors.Wrap(err, "getting backup credentials secret")
}
validationErrs = append(validationErrs,
field.NotFound(fldPath.Child("storageProvider", "s3", "credentialsSecret", "name"), backup.Spec.StorageProvider.S3.CredentialsSecret.Name))
}
if len(validationErrs) > 0 {
validationErr = validationErrs.ToAggregate()
}
}
// If the Backup is not valid emit an event to that effect and mark
// it as failed.
// TODO(apryde): Maybe we should add an UpdateFunc to the backupInformer
// and support users fixing validation errors via updates (rather than
// recreation).
if validationErr != nil {
controller.recorder.Eventf(backup, corev1.EventTypeWarning, "FailedValidation", validationErr.Error())
// NOTE: We only return an error here if we fail to set the condition
// (rather than on validation failure) as we don't want to retry.
return controller.conditionUpdater.Update(backup, &v1alpha1.BackupCondition{
Type: v1alpha1.BackupFailed,
Status: corev1.ConditionFalse,
Reason: "FailedValidation",
Message: validationErr.Error(),
})
}
err = controller.performBackup(backup, creds)
if err != nil {
return err
}
return nil
}
func (controller *AgentController) performBackup(backup *v1alpha1.Backup, creds *corev1.Secret) error {
// Update backup phase to started.
started := time.Now()
if err := controller.conditionUpdater.Update(backup, &v1alpha1.BackupCondition{
Type: v1alpha1.BackupRunning,
Status: corev1.ConditionTrue,
}); err != nil {
return err
}
// TODO: Should backuphandler.NewConfiguredRunner accept a map[string][]byte
// instead?
credsMap := make(map[string]string, len(creds.Data))
for k, v := range creds.Data {
credsMap[k] = string(v)
}
runner, err := backuphandler.NewConfiguredRunner(backup.Spec.Executor, executor.DefaultCreds(), backup.Spec.StorageProvider, credsMap)
if err != nil {
controller.recorder.Event(backup, corev1.EventTypeWarning, "ExecutionFailed", err.Error())
return controller.conditionUpdater.Update(backup, &v1alpha1.BackupCondition{
Type: v1alpha1.BackupFailed,
Status: corev1.ConditionFalse,
Reason: "ExecutionFailed",
Message: err.Error(),
})
}
key, err := runner.Backup(fmt.Sprintf("%s-%s", backup.Spec.Cluster.Name, backup.Name))
if err != nil {
controller.recorder.Event(backup, corev1.EventTypeWarning, "ExecutionFailed", err.Error())
return controller.conditionUpdater.Update(backup, &v1alpha1.BackupCondition{
Type: v1alpha1.BackupFailed,
Status: corev1.ConditionFalse,
Reason: "ExecutionFailed",
Message: err.Error(),
})
}
finished := time.Now()
// Get (updated) resource from store.
backup, err = controller.backupLister.Backups(backup.GetNamespace()).Get(backup.GetName())
if err != nil {
return errors.Wrap(err, "error getting Backup")
}
// Don't modify items in the cache.
backup = backup.DeepCopy()
// Set defaults (incl. operator version label).
backup = backup.EnsureDefaults()
backup.Status.TimeStarted = metav1.Time{Time: started}
backup.Status.TimeCompleted = metav1.Time{Time: finished}
backup.Status.Outcome = v1alpha1.BackupOutcome{Location: key}
backuputil.UpdateBackupCondition(&backup.Status, &v1alpha1.BackupCondition{
Type: v1alpha1.BackupComplete,
Status: corev1.ConditionTrue,
})
backup, err = controller.client.Backups(backup.Namespace).Update(backup)
if err != nil {
return errors.Wrapf(err, "failed to mark Backup %q as complete", kubeutil.NamespaceAndName(backup))
}
metrics.IncEventCounter(clusterBackupCount)
glog.Infof("Backup %q succeeded in %v", backup.Name, finished.Sub(started))
controller.recorder.Event(backup, corev1.EventTypeNormal, "Complete", "Backup complete")
return nil
}