forked from kubesphere/kubesphere
/
groupbinding_controller.go
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/
groupbinding_controller.go
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/*
Copyright 2020 The KubeSphere 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 groupbinding
import (
"fmt"
iamv1alpha2 "github.com/fearlesschenc/kubesphere/pkg/apis/iam/v1alpha2"
kubesphere "github.com/fearlesschenc/kubesphere/pkg/client/clientset/versioned"
iamv1alpha2informers "github.com/fearlesschenc/kubesphere/pkg/client/informers/externalversions/iam/v1alpha2"
iamv1alpha2listers "github.com/fearlesschenc/kubesphere/pkg/client/listers/iam/v1alpha2"
"github.com/fearlesschenc/kubesphere/pkg/controller/utils/controller"
"github.com/fearlesschenc/kubesphere/pkg/utils/sliceutil"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
successSynced = "Synced"
messageResourceSynced = "GroupBinding synced successfully"
controllerName = "groupbinding-controller"
finalizer = "finalizers.kubesphere.io/groupsbindings"
)
type Controller struct {
controller.BaseController
scheme *runtime.Scheme
k8sClient kubernetes.Interface
ksClient kubesphere.Interface
groupBindingInformer iamv1alpha2informers.GroupBindingInformer
groupBindingLister iamv1alpha2listers.GroupBindingLister
recorder record.EventRecorder
}
// NewController creates GroupBinding Controller instance
func NewController(k8sClient kubernetes.Interface, ksClient kubesphere.Interface, groupBindingInformer iamv1alpha2informers.GroupBindingInformer) *Controller {
klog.V(4).Info("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(klog.Infof)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: k8sClient.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: controllerName})
ctl := &Controller{
BaseController: controller.BaseController{
Workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "GroupBinding"),
Synced: []cache.InformerSynced{groupBindingInformer.Informer().HasSynced},
Name: controllerName,
},
k8sClient: k8sClient,
ksClient: ksClient,
groupBindingInformer: groupBindingInformer,
groupBindingLister: groupBindingInformer.Lister(),
recorder: recorder,
}
ctl.Handler = ctl.reconcile
klog.Info("Setting up event handlers")
groupBindingInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ctl.Enqueue,
UpdateFunc: func(old, new interface{}) {
ctl.Enqueue(new)
},
DeleteFunc: ctl.Enqueue,
})
return ctl
}
// reconcile handles GroupBinding informer events, it updates user's Groups property with the current GroupBinding.
func (c *Controller) reconcile(key string) error {
groupBinding, err := c.groupBindingLister.Get(key)
if err != nil {
if errors.IsNotFound(err) {
utilruntime.HandleError(fmt.Errorf("groupbinding '%s' in work queue no longer exists", key))
return nil
}
klog.Error(err)
return err
}
if groupBinding.ObjectMeta.DeletionTimestamp.IsZero() {
if !sliceutil.HasString(groupBinding.Finalizers, finalizer) {
groupBinding.ObjectMeta.Finalizers = append(groupBinding.ObjectMeta.Finalizers, finalizer)
if groupBinding, err = c.ksClient.IamV1alpha2().GroupBindings().Update(groupBinding); err != nil {
return err
}
// Skip reconcile when groupbinding is updated.
return nil
}
} else {
// The object is being deleted
if sliceutil.HasString(groupBinding.ObjectMeta.Finalizers, finalizer) {
if err = c.unbindUser(groupBinding); err != nil {
klog.Error(err)
return err
}
groupBinding.Finalizers = sliceutil.RemoveString(groupBinding.ObjectMeta.Finalizers, func(item string) bool {
return item == finalizer
})
if groupBinding, err = c.ksClient.IamV1alpha2().GroupBindings().Update(groupBinding); err != nil {
return err
}
}
return nil
}
if err = c.bindUser(groupBinding); err != nil {
klog.Error(err)
return err
}
c.recorder.Event(groupBinding, corev1.EventTypeNormal, successSynced, messageResourceSynced)
return nil
}
func (c *Controller) Start(stopCh <-chan struct{}) error {
return c.Run(2, stopCh)
}
func (c *Controller) unbindUser(groupBinding *iamv1alpha2.GroupBinding) error {
return c.updateUserGroups(groupBinding, func(groups []string, group string) (bool, []string) {
// remove a group from the groups
if sliceutil.HasString(groups, group) {
groups := sliceutil.RemoveString(groups, func(item string) bool {
return item == group
})
return true, groups
}
return false, groups
})
}
func (c *Controller) bindUser(groupBinding *iamv1alpha2.GroupBinding) error {
return c.updateUserGroups(groupBinding, func(groups []string, group string) (bool, []string) {
// add group to the groups
if !sliceutil.HasString(groups, group) {
groups := append(groups, group)
return true, groups
}
return false, groups
})
}
// Udpate user's Group property. So no need to query user's groups when authorizing.
func (c *Controller) updateUserGroups(groupBinding *iamv1alpha2.GroupBinding, operator func(groups []string, group string) (bool, []string)) error {
for _, u := range groupBinding.Users {
// Ignore the user if the user if being deleted.
if user, err := c.ksClient.IamV1alpha2().Users().Get(u, metav1.GetOptions{}); err == nil && user.ObjectMeta.DeletionTimestamp.IsZero() {
if errors.IsNotFound(err) {
klog.Infof("user %s doesn't exist any more", u)
continue
}
if changed, groups := operator(user.Spec.Groups, groupBinding.GroupRef.Name); changed {
if err := c.patchUser(user, groups); err != nil {
if errors.IsNotFound(err) {
klog.Infof("user %s doesn't exist any more", u)
continue
}
klog.Error(err)
return err
}
}
}
}
return nil
}
func (c *Controller) patchUser(user *iamv1alpha2.User, groups []string) error {
newUser := user.DeepCopy()
newUser.Spec.Groups = groups
patch := client.MergeFrom(user)
patchData, _ := patch.Data(newUser)
if _, err := c.ksClient.IamV1alpha2().Users().
Patch(user.Name, patch.Type(), patchData); err != nil {
return err
}
return nil
}