mirror of
https://github.com/intel/intel-device-plugins-for-kubernetes.git
synced 2025-06-03 03:59:37 +00:00
271 lines
8.4 KiB
Go
271 lines
8.4 KiB
Go
// Copyright 2020 Intel Corporation. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package controllers contains code common for the device plugin controllers.
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package controllers
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import (
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"context"
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"sync"
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"github.com/go-logr/logr"
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apps "k8s.io/api/apps/v1"
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v1 "k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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ctrl "sigs.k8s.io/controller-runtime"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/log"
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)
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var (
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bKeeper = &bookKeeper{}
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)
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func init() {
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bKeeper.pluginCounter = make(map[string]int)
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}
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type bookKeeper struct {
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sync.Mutex
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pluginCounter map[string]int
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}
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func (b *bookKeeper) set(pluginKind string, count int) {
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b.Lock()
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defer b.Unlock()
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b.pluginCounter[pluginKind] = count
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}
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func (b *bookKeeper) count(pluginKind string) int {
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b.Lock()
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defer b.Unlock()
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return b.pluginCounter[pluginKind]
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}
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// GetDevicePluginCount returns number of device plugin CRs registered.
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func GetDevicePluginCount(pluginKind string) int {
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return bKeeper.count(pluginKind)
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}
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// +kubebuilder:rbac:groups=apps,resources=daemonsets,verbs=get;list;watch;create;update;patch;delete
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// +kubebuilder:rbac:groups="",resources=pods,verbs=get;list;watch
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// +kubebuilder:rbac:groups=coordination.k8s.io,resources=leases,verbs=create
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// +kubebuilder:rbac:groups=coordination.k8s.io,resources=leases,resourceNames=d1c7b6d5.intel.com,verbs=get;update
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// DevicePluginController provides functionality for manipulating actual device plugin CRD objects.
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type DevicePluginController interface {
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CreateEmptyObject() (devicePlugin client.Object)
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GetTotalObjectCount(ctx context.Context, client client.Client) (count int, err error)
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NewDaemonSet(devicePlugin client.Object) *apps.DaemonSet
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UpdateDaemonSet(client.Object, *apps.DaemonSet) (updated bool)
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UpdateStatus(client.Object, *apps.DaemonSet, []string) (updated bool, err error)
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}
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type reconciler struct {
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client.Client
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scheme *runtime.Scheme
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pluginKind string
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ownerKey string
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controller DevicePluginController
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}
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// Reconcile reconciles a device plugin object.
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func (r *reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
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log := log.FromContext(ctx).WithValues(r.pluginKind, req.NamespacedName)
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if err := r.updateBookKeeper(ctx); err != nil {
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log.Error(err, "unable to total count of device plugins")
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return ctrl.Result{}, err
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}
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// Fetch the plugin's DaemonSet.
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var childDaemonSets apps.DaemonSetList
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if err := r.List(ctx, &childDaemonSets, client.InNamespace(req.Namespace), client.MatchingFields{r.ownerKey: req.Name}); err != nil {
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log.Error(err, "unable to list child DaemonSets")
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return ctrl.Result{}, err
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}
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devicePlugin := r.controller.CreateEmptyObject()
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if err := r.Get(ctx, req.NamespacedName, devicePlugin); err != nil {
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return r.maybeDeleteDaemonSets(ctx, err, childDaemonSets.Items, log)
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}
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// Create a daemon set for the plugin if it doesn't exist.
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if len(childDaemonSets.Items) == 0 {
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return r.createDaemonSet(ctx, devicePlugin, log)
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}
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ds := &childDaemonSets.Items[0]
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// Synchronize the DaemonSet with its owner.
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if r.controller.UpdateDaemonSet(devicePlugin, ds) {
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if err := r.Update(ctx, ds); err != nil {
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log.Error(err, "unable to update DaemonSet", "DaemonSet", ds)
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return ctrl.Result{}, err
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}
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}
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// Fetch the pods controlled by the controller's DaemonSet to list nodes
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var pods v1.PodList
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if err := r.List(ctx, &pods, client.InNamespace(ds.Namespace), client.MatchingFields{r.ownerKey: ds.Name}); err != nil {
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log.Error(err, "unable to list child Pods of the controlled daemon set")
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return ctrl.Result{}, err
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}
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nodeNames := make([]string, len(pods.Items))
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for i, pod := range pods.Items {
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nodeNames[i] = pod.Spec.NodeName
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}
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// Update status
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statusUpdated, err := r.controller.UpdateStatus(devicePlugin, &childDaemonSets.Items[0], nodeNames)
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if err != nil {
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return ctrl.Result{}, err
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}
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if statusUpdated {
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if err := r.Status().Update(ctx, devicePlugin); apierrors.IsConflict(err) {
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return ctrl.Result{Requeue: true}, nil
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} else if err != nil {
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log.Error(err, "unable to update device plugin status")
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return ctrl.Result{}, err
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}
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}
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// Drop redundant daemon sets if any.
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r.maybeDeleteRedundantDaemonSets(ctx, childDaemonSets.Items, log)
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return ctrl.Result{}, nil
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}
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// SetupWithManager sets up a reconciler for a given device plugin controller.
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func SetupWithManager(mgr ctrl.Manager, controller DevicePluginController, apiGVString, pluginKind, ownerKey string) error {
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r := &reconciler{
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Client: mgr.GetClient(),
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scheme: mgr.GetScheme(),
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ownerKey: ownerKey,
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controller: controller,
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pluginKind: pluginKind,
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}
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ctx := context.Background()
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// Index DaemonSets with their owner (e.g. QatDevicePlugin).
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if err := mgr.GetFieldIndexer().IndexField(ctx, &apps.DaemonSet{}, ownerKey,
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func(rawObj client.Object) []string {
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// grab the DaemonSet object, extract the owner...
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ds := rawObj.(*apps.DaemonSet)
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owner := metav1.GetControllerOf(ds)
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if owner == nil {
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return nil
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}
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// make sure it's a device plugin
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if owner.APIVersion != apiGVString || owner.Kind != pluginKind {
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return nil
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}
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// and if so, return it.
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return []string{owner.Name}
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}); err != nil {
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return err
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}
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// Index Pods with their owner (DaemonSet).
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if err := mgr.GetFieldIndexer().IndexField(ctx, &v1.Pod{}, ownerKey,
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func(rawObj client.Object) []string {
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// grab the Pod object, extract the owner...
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pod := rawObj.(*v1.Pod)
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owner := metav1.GetControllerOf(pod)
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if owner == nil {
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return nil
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}
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// make sure it's a DaemonSet
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if owner.APIVersion != apps.SchemeGroupVersion.String() || owner.Kind != "DaemonSet" {
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return nil
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}
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// and if so, return it.
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return []string{owner.Name}
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}); err != nil {
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return err
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}
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return ctrl.NewControllerManagedBy(mgr).
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For(r.controller.CreateEmptyObject()).
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Owns(&apps.DaemonSet{}).
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Complete(r)
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}
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func (r *reconciler) updateBookKeeper(ctx context.Context) error {
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count, err := r.controller.GetTotalObjectCount(ctx, r)
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if err != nil {
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return err
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}
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bKeeper.set(r.pluginKind, count)
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return nil
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}
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func (r *reconciler) createDaemonSet(ctx context.Context, dp client.Object, log logr.Logger) (ctrl.Result, error) {
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ds := r.controller.NewDaemonSet(dp)
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if err := ctrl.SetControllerReference(dp.(metav1.Object), ds, r.scheme); err != nil {
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log.Error(err, "unable to set controller reference")
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return ctrl.Result{}, err
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}
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if err := r.Create(ctx, ds); err != nil {
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log.Error(err, "unable to create DaemonSet")
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return ctrl.Result{}, err
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}
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return ctrl.Result{}, nil
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}
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func (r *reconciler) maybeDeleteDaemonSets(ctx context.Context, err error, daemonSets []apps.DaemonSet, log logr.Logger) (ctrl.Result, error) {
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if apierrors.IsNotFound(err) {
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for i := range daemonSets {
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if err = r.Delete(ctx, &daemonSets[i], client.PropagationPolicy(metav1.DeletePropagationBackground)); client.IgnoreNotFound(err) != nil {
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log.Error(err, "unable to delete DaemonSet", "DaemonSet", daemonSets[i])
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return ctrl.Result{}, err
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}
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}
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log.V(1).Info("deleted DaemonSets owned by deleted custom device plugin object")
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return ctrl.Result{}, nil
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}
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log.Error(err, "unable to fetch custom device plugin object")
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return ctrl.Result{}, err
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}
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func (r *reconciler) maybeDeleteRedundantDaemonSets(ctx context.Context, dsets []apps.DaemonSet, log logr.Logger) {
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count := len(dsets)
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if count > 1 {
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log.V(0).Info("there are redundant DaemonSets", "redundantDS", count-1)
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redundantSets := dsets[1:]
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for i := range redundantSets {
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if err := r.Delete(ctx, &redundantSets[i], client.PropagationPolicy(metav1.DeletePropagationBackground)); client.IgnoreNotFound(err) != nil {
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log.Error(err, "unable to delete redundant DaemonSet", "DaemonSet", redundantSets[i])
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} else {
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log.V(1).Info("deleted redundant DaemonSet", "DaemonSet", redundantSets[i])
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}
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}
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}
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}
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