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controller.go
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controller.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-2019 Datadog, Inc.
package extendeddaemonsetreplicaset
import (
"context"
"fmt"
"math/rand"
"strings"
"time"
"github.com/go-logr/logr"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apiequality "k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
utilserrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/flowcontrol"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
datadoghqv1alpha1 "github.com/DataDog/extendeddaemonset/api/v1alpha1"
"github.com/DataDog/extendeddaemonset/controllers/extendeddaemonsetreplicaset/conditions"
"github.com/DataDog/extendeddaemonset/controllers/extendeddaemonsetreplicaset/strategy"
"github.com/DataDog/extendeddaemonset/pkg/controller/utils"
)
// Reconciler is the internal reconciler for ExtendedDaemonSetReplicaSet.
type Reconciler struct {
options ReconcilerOptions
client client.Client
scheme *runtime.Scheme
log logr.Logger
recorder record.EventRecorder
failedPodsBackOff *flowcontrol.Backoff
}
// ReconcilerOptions provides options read from command line.
type ReconcilerOptions struct {
IsNodeAffinitySupported bool
}
// NewReconciler returns a reconciler for DatadogAgent.
func NewReconciler(options ReconcilerOptions, client client.Client, scheme *runtime.Scheme, log logr.Logger, recorder record.EventRecorder) (*Reconciler, error) {
return &Reconciler{
options: options,
client: client,
scheme: scheme,
log: log,
recorder: recorder,
failedPodsBackOff: flowcontrol.NewBackOff(10*time.Second, 15*time.Minute),
}, nil
}
// Reconcile reads that state of the cluster for a ExtendedDaemonSetReplicaSet object and makes changes based on the state read
// and what is in the ExtendedDaemonSetReplicaSet.Spec.
func (r *Reconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
now := metav1.NewTime(time.Now())
rand := rand.Uint32()
reqLogger := r.log.WithValues("Req.NS", request.Namespace, "Req.Name", request.Name, "Req.TS", now.Unix(), "Req.Rand", rand)
reqLogger.Info("Reconciling ExtendedDaemonSetReplicaSet")
// Fetch the ExtendedDaemonSetReplicaSet replicaSetInstance
replicaSetInstance, needReturn, err := r.retrievedReplicaSet(request)
if needReturn {
return reconcile.Result{}, err
}
// First retrieve the Parent DDaemonset
daemonsetInstance, err := r.getDaemonsetOwner(replicaSetInstance)
if err != nil {
return reconcile.Result{}, err
}
if !datadoghqv1alpha1.IsDefaultedExtendedDaemonSet(daemonsetInstance) {
message := "Parent ExtendedDaemonSet is not defaulted, requeuing"
reqLogger.Info(message)
err = fmt.Errorf("parent ExtendedDaemonSet is not defaulted")
newStatus := replicaSetInstance.Status.DeepCopy()
// Updating the status with a new condition will trigger a new Event on the ExtendedDaemonSet-controller
// and so the ExtendedDamonset will be defaulted.
// It is better to only update a Resource Kind from its own controller, to avoid conccurent update.
conditions.UpdateErrorCondition(newStatus, now, err, message)
err = r.updateReplicaSet(replicaSetInstance, newStatus)
return reconcile.Result{RequeueAfter: time.Second}, err
}
lastResyncTimeStampCond := conditions.GetExtendedDaemonSetReplicaSetStatusCondition(&replicaSetInstance.Status, datadoghqv1alpha1.ConditionTypeLastFullSync)
if lastResyncTimeStampCond != nil {
nextSyncTS := lastResyncTimeStampCond.LastUpdateTime.Add(daemonsetInstance.Spec.Strategy.ReconcileFrequency.Duration)
if nextSyncTS.After(now.Time) {
requeueDuration := nextSyncTS.Sub(now.Time)
// reqLogger.V(1).Info("Reconcile, skip this resync", "requeueAfter", requeueDuration)
return reconcile.Result{RequeueAfter: requeueDuration}, nil
}
}
// retrieved and build information for the strategy
strategyParams, err := r.buildStrategyParams(reqLogger, daemonsetInstance, replicaSetInstance)
if err != nil {
return reconcile.Result{}, err
}
// now apply the strategy depending on the ReplicaSet state
strategyResult, err := r.applyStrategy(reqLogger, daemonsetInstance, now, strategyParams)
newStatus := strategyResult.NewStatus
result := strategyResult.Result
// for the reste of the actions we will try to execute as many actions as we can so we will store possible errors in a list
// each action can be executed in parallel.
var errs []error
if err != nil {
errs = append(errs, err)
}
var desc string
status := corev1.ConditionTrue
if len(strategyResult.UnscheduledNodesDueToResourcesConstraints) > 0 {
desc = fmt.Sprintf("nodes:%s", strings.Join(strategyResult.UnscheduledNodesDueToResourcesConstraints, ";"))
} else {
status = corev1.ConditionFalse
}
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(newStatus, now, datadoghqv1alpha1.ConditionTypeUnschedule, status, "", desc, false, false)
// start actions on pods
requeueAfter := 5 * time.Second
if daemonsetInstance.Spec.Strategy.ReconcileFrequency != nil {
requeueAfter = daemonsetInstance.Spec.Strategy.ReconcileFrequency.Duration
}
lastPodDeletionCondition := conditions.GetExtendedDaemonSetReplicaSetStatusCondition(newStatus, datadoghqv1alpha1.ConditionTypePodDeletion)
if lastPodDeletionCondition != nil && now.Sub(lastPodDeletionCondition.LastUpdateTime.Time) < requeueAfter {
reqLogger.V(1).Info("Delay pods deletion", "deplay", requeueAfter, "since", now.Sub(lastPodDeletionCondition.LastUpdateTime.Time))
result.RequeueAfter = requeueAfter
} else {
errs = append(errs, deletePods(reqLogger, r.client, strategyParams.PodByNodeName, strategyResult.PodsToDelete)...)
if len(strategyResult.PodsToDelete) > 0 {
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(newStatus, now, datadoghqv1alpha1.ConditionTypePodDeletion, corev1.ConditionTrue, "", "pods deleted", false, true)
}
}
lastPodCreationCondition := conditions.GetExtendedDaemonSetReplicaSetStatusCondition(newStatus, datadoghqv1alpha1.ConditionTypePodCreation)
if lastPodCreationCondition != nil && now.Sub(lastPodCreationCondition.LastUpdateTime.Time) < daemonsetInstance.Spec.Strategy.ReconcileFrequency.Duration {
reqLogger.V(1).Info("Delay pods creation", "deplay:", requeueAfter, "since", now.Sub(lastPodDeletionCondition.LastUpdateTime.Time))
result.RequeueAfter = requeueAfter
} else {
errs = append(errs, createPods(reqLogger, r.client, r.scheme, r.options.IsNodeAffinitySupported, replicaSetInstance, strategyResult.PodsToCreate)...)
if len(strategyResult.PodsToCreate) > 0 {
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(newStatus, now, datadoghqv1alpha1.ConditionTypePodCreation, corev1.ConditionTrue, "", "pods created", false, true)
}
}
err = utilserrors.NewAggregate(errs)
conditions.UpdateErrorCondition(newStatus, now, err, "")
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(newStatus, now, datadoghqv1alpha1.ConditionTypeLastFullSync, corev1.ConditionTrue, "", "full sync", true, true)
reqLogger.V(1).Info("Updating ExtendedDaemonSetReplicaSet status")
err = r.updateReplicaSet(replicaSetInstance, newStatus)
// Garbage collect the failedPodsBackOff map once per minute,
// i.e. whenever the seconds [0,59] is less than the reconcile frequency
if now.Time.Second() < int(daemonsetInstance.Spec.Strategy.ReconcileFrequency.Duration.Seconds()) {
// Garbage collect records that have aged past the maxDuration (here: 15min)
r.failedPodsBackOff.GC()
}
return result, err
}
func (r *Reconciler) buildStrategyParams(logger logr.Logger, daemonset *datadoghqv1alpha1.ExtendedDaemonSet, replicaset *datadoghqv1alpha1.ExtendedDaemonSetReplicaSet) (*strategy.Parameters, error) {
rsStatus := retrieveReplicaSetStatus(daemonset, replicaset.Name)
// Retrieve the Node associated to the replicaset (with node selector)
nodeList, podList, err := r.getPodAndNodeList(logger, daemonset, replicaset)
if err != nil {
return nil, err
}
strategyParams := &strategy.Parameters{
EDSName: daemonset.Name,
Strategy: &daemonset.Spec.Strategy,
Replicaset: replicaset,
ReplicaSetStatus: string(rsStatus),
Logger: logger.WithValues("strategy", rsStatus),
NewStatus: replicaset.Status.DeepCopy(),
}
var nodesFilter []string
if daemonset.Status.Canary != nil {
strategyParams.CanaryNodes = daemonset.Status.Canary.Nodes
if daemonset.Status.ActiveReplicaSet == replicaset.Name {
nodesFilter = strategyParams.CanaryNodes
}
}
// Associate Pods to Nodes
strategyParams.NodeByName, strategyParams.PodByNodeName, strategyParams.PodToCleanUp, strategyParams.UnscheduledPods = r.FilterAndMapPodsByNode(logger.WithValues("status", string(rsStatus)), replicaset, nodeList, podList, nodesFilter)
return strategyParams, nil
}
func (r *Reconciler) applyStrategy(logger logr.Logger, daemonset *datadoghqv1alpha1.ExtendedDaemonSet, now metav1.Time, strategyParams *strategy.Parameters) (*strategy.Result, error) {
var strategyResult *strategy.Result
var err error
logger.V(1).Info("DaemonsetStatus: ", "status", daemonset.Status)
switch strategy.ReplicaSetStatus(strategyParams.ReplicaSetStatus) {
case strategy.ReplicaSetStatusActive:
logger.Info("manage deployment")
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(strategyParams.NewStatus, now, datadoghqv1alpha1.ConditionTypeCanary, corev1.ConditionFalse, "", "", false, false)
strategyResult, err = strategy.ManageDeployment(r.client, daemonset, strategyParams)
case strategy.ReplicaSetStatusCanary:
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(strategyParams.NewStatus, now, datadoghqv1alpha1.ConditionTypeCanary, corev1.ConditionTrue, "", "", false, false)
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(strategyParams.NewStatus, now, datadoghqv1alpha1.ConditionTypeActive, corev1.ConditionFalse, "", "", false, false)
logger.Info("manage canary deployment")
strategyResult, err = strategy.ManageCanaryDeployment(r.client, daemonset, strategyParams)
case strategy.ReplicaSetStatusCanaryFailed:
logger.Info("manage canary failed deployment")
strategyResult = &strategy.Result{
NewStatus: strategyParams.NewStatus.DeepCopy(),
}
case strategy.ReplicaSetStatusUnknown:
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(strategyParams.NewStatus, now, datadoghqv1alpha1.ConditionTypeCanary, corev1.ConditionFalse, "", "", false, false)
conditions.UpdateExtendedDaemonSetReplicaSetStatusCondition(strategyParams.NewStatus, now, datadoghqv1alpha1.ConditionTypeActive, corev1.ConditionFalse, "", "", false, false)
logger.Info("ignore this replicaset, since it's not the replicas active or canary")
strategyResult, err = strategy.ManageUnknown(r.client, strategyParams)
}
return strategyResult, err
}
func (r *Reconciler) getPodAndNodeList(logger logr.Logger, daemonset *datadoghqv1alpha1.ExtendedDaemonSet, replicaset *datadoghqv1alpha1.ExtendedDaemonSetReplicaSet) (*strategy.NodeList, *corev1.PodList, error) {
var nodeList *strategy.NodeList
var podList *corev1.PodList
var err error
nodeList, err = r.getNodeList(daemonset, replicaset)
if err != nil {
logger.Error(err, "unable to list associated pods")
return nodeList, podList, err
}
// Retrieve the Node associated to the replicaset
podList, err = r.getPodList(daemonset)
if err != nil {
logger.Error(err, "unable to list associated pods")
return nodeList, podList, err
}
var oldPodList *corev1.PodList
oldPodList, err = r.getOldDaemonsetPodList(daemonset)
if err != nil {
logger.Error(err, "unable to list associated pods")
return nodeList, podList, err
}
podList.Items = append(podList.Items, oldPodList.Items...)
return nodeList, podList, nil
}
func (r *Reconciler) retrievedReplicaSet(request reconcile.Request) (*datadoghqv1alpha1.ExtendedDaemonSetReplicaSet, bool, error) {
replicaSetInstance := &datadoghqv1alpha1.ExtendedDaemonSetReplicaSet{}
err := r.client.Get(context.TODO(), request.NamespacedName, replicaSetInstance)
if err != nil {
if errors.IsNotFound(err) {
// Request object not found, could have been deleted after reconcile request.
// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
// Return and don't requeue
return nil, true, nil
}
// Error reading the object - requeue the request.
return nil, true, err
}
return replicaSetInstance, false, nil
}
func (r *Reconciler) updateReplicaSet(replicaset *datadoghqv1alpha1.ExtendedDaemonSetReplicaSet, newStatus *datadoghqv1alpha1.ExtendedDaemonSetReplicaSetStatus) error {
// compare
if !apiequality.Semantic.DeepEqual(&replicaset.Status, newStatus) {
newRS := replicaset.DeepCopy()
newRS.Status = *newStatus
return r.client.Status().Update(context.TODO(), newRS)
}
return nil
}
func (r *Reconciler) getDaemonsetOwner(replicaset *datadoghqv1alpha1.ExtendedDaemonSetReplicaSet) (*datadoghqv1alpha1.ExtendedDaemonSet, error) {
ownerName, err := retrieveOwnerReference(replicaset)
if err != nil {
return nil, err
}
daemonsetInstance := &datadoghqv1alpha1.ExtendedDaemonSet{}
err = r.client.Get(context.TODO(), types.NamespacedName{Name: ownerName, Namespace: replicaset.Namespace}, daemonsetInstance)
if err != nil {
return nil, err
}
return daemonsetInstance, nil
}
func (r *Reconciler) getExtendedDaemonsetSettings(eds *datadoghqv1alpha1.ExtendedDaemonSet) ([]*datadoghqv1alpha1.ExtendedDaemonsetSetting, error) {
edsNodeList := &datadoghqv1alpha1.ExtendedDaemonsetSettingList{}
err := r.client.List(context.TODO(), edsNodeList, &client.ListOptions{Namespace: eds.Namespace})
if err != nil {
return nil, err
}
var outputList []*datadoghqv1alpha1.ExtendedDaemonsetSetting
for index, edsNode := range edsNodeList.Items {
if edsNode.Spec.Reference == nil {
continue
}
if edsNode.Spec.Reference.Name == eds.Name {
outputList = append(outputList, &edsNodeList.Items[index])
}
}
return outputList, nil
}
func (r *Reconciler) getPodList(ds *datadoghqv1alpha1.ExtendedDaemonSet) (*corev1.PodList, error) {
podList := &corev1.PodList{}
podSelector := labels.Set{datadoghqv1alpha1.ExtendedDaemonSetNameLabelKey: ds.Name}
podListOptions := []client.ListOption{
client.MatchingLabelsSelector{
Selector: podSelector.AsSelectorPreValidated(),
},
}
if err := r.client.List(context.TODO(), podList, podListOptions...); err != nil {
return nil, err
}
return podList, nil
}
func (r *Reconciler) getNodeList(eds *datadoghqv1alpha1.ExtendedDaemonSet, replicaset *datadoghqv1alpha1.ExtendedDaemonSetReplicaSet) (*strategy.NodeList, error) {
nodeItemList := &strategy.NodeList{}
listOptions := []client.ListOption{}
if replicaset.Spec.Selector != nil {
selector, err := utils.ConvertLabelSelector(r.log, replicaset.Spec.Selector)
if err != nil {
return nil, err
}
listOptions = []client.ListOption{
client.MatchingLabelsSelector{
Selector: selector,
},
}
}
nodeList := &corev1.NodeList{}
if err := r.client.List(context.TODO(), nodeList, listOptions...); err != nil {
return nil, err
}
extendedDaemonsetSettings, err := r.getExtendedDaemonsetSettings(eds)
if err != nil {
return nil, err
}
for index, node := range nodeList.Items {
var edsNodeSelected *datadoghqv1alpha1.ExtendedDaemonsetSetting
for _, edsNode := range extendedDaemonsetSettings {
if edsNode.Status.Status != datadoghqv1alpha1.ExtendedDaemonsetSettingStatusValid {
continue
}
selector, err2 := metav1.LabelSelectorAsSelector(&edsNode.Spec.NodeSelector)
if err2 != nil {
return nil, err2
}
if selector.Matches(labels.Set(node.Labels)) {
edsNodeSelected = edsNode
break
}
}
nodeItemList.Items = append(nodeItemList.Items, strategy.NewNodeItem(&nodeList.Items[index], edsNodeSelected))
}
return nodeItemList, nil
}
func (r *Reconciler) getOldDaemonsetPodList(ds *datadoghqv1alpha1.ExtendedDaemonSet) (*corev1.PodList, error) {
podList := &corev1.PodList{}
oldDsName, ok := ds.GetAnnotations()[datadoghqv1alpha1.ExtendedDaemonSetOldDaemonsetAnnotationKey]
if !ok {
return podList, nil
}
oldDaemonset := &appsv1.DaemonSet{}
err := r.client.Get(context.TODO(), types.NamespacedName{Namespace: ds.Namespace, Name: oldDsName}, oldDaemonset)
if err != nil {
if errors.IsNotFound(err) {
return podList, nil
}
// Error reading the object - requeue the request.
return nil, err
}
podListOptions := []client.ListOption{}
if oldDaemonset.Spec.Selector != nil {
selector, err2 := utils.ConvertLabelSelector(r.log, oldDaemonset.Spec.Selector)
if err2 != nil {
return nil, err2
}
podListOptions = []client.ListOption{
client.MatchingLabelsSelector{
Selector: selector,
},
}
}
if err = r.client.List(context.TODO(), podList, podListOptions...); err != nil {
return nil, err
}
// filter by ownerreferences,
// This is to prevent issue with label selector that match between DS and EDS
var filterPods []corev1.Pod
for id, pod := range podList.Items {
selected := false
for _, ref := range pod.OwnerReferences {
if ref.Kind == "DaemonSet" && ref.Name == oldDsName {
selected = true
break
}
}
if selected {
filterPods = append(filterPods, podList.Items[id])
}
}
podList.Items = filterPods
return podList, nil
}
func retrieveOwnerReference(obj *datadoghqv1alpha1.ExtendedDaemonSetReplicaSet) (string, error) {
for _, ref := range obj.OwnerReferences {
if ref.Kind == "ExtendedDaemonSet" {
return ref.Name, nil
}
}
return "", fmt.Errorf("unable to retrieve the owner reference name")
}
func retrieveReplicaSetStatus(daemonset *datadoghqv1alpha1.ExtendedDaemonSet, replicassetName string) strategy.ReplicaSetStatus {
switch daemonset.Status.ActiveReplicaSet {
case "":
return strategy.ReplicaSetStatusUnknown
case replicassetName:
return strategy.ReplicaSetStatusActive
default:
if daemonset.Status.Canary != nil && daemonset.Status.Canary.ReplicaSet == replicassetName {
return strategy.ReplicaSetStatusCanary
}
return strategy.ReplicaSetStatusUnknown
}
}