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templateinstance_controller.go
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templateinstance_controller.go
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package controller
import (
"errors"
"fmt"
"time"
apierrors "k8s.io/apimachinery/pkg/api/errors"
kerrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apiserver/pkg/authentication/user"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/apis/authorization"
kclientsetinternal "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/kubectl/resource"
"github.com/golang/glog"
"github.com/openshift/origin/pkg/api/latest"
"github.com/openshift/origin/pkg/authorization/util"
"github.com/openshift/origin/pkg/client"
"github.com/openshift/origin/pkg/config/cmd"
templateapi "github.com/openshift/origin/pkg/template/api"
templateapiv1 "github.com/openshift/origin/pkg/template/api/v1"
"github.com/openshift/origin/pkg/template/generated/informers/internalversion/template/internalversion"
internalversiontemplate "github.com/openshift/origin/pkg/template/generated/internalclientset/typed/template/internalversion"
templatelister "github.com/openshift/origin/pkg/template/generated/listers/template/internalversion"
)
// TemplateInstanceController watches for new TemplateInstance objects and
// instantiates the template contained within, using parameters read from a
// linked Secret object. The TemplateInstanceController instantiates objects
// using its own service account, first verifying that the requester also has
// permissions to instantiate.
type TemplateInstanceController struct {
oc client.Interface
kc kclientsetinternal.Interface
templateclient internalversiontemplate.TemplateInterface
lister templatelister.TemplateInstanceLister
informer cache.SharedIndexInformer
queue workqueue.RateLimitingInterface
}
// NewTemplateInstanceController returns a new TemplateInstanceController.
func NewTemplateInstanceController(oc client.Interface, kc kclientsetinternal.Interface, templateclient internalversiontemplate.TemplateInterface, informer internalversion.TemplateInstanceInformer) *TemplateInstanceController {
c := &TemplateInstanceController{
oc: oc,
kc: kc,
templateclient: templateclient,
lister: informer.Lister(),
informer: informer.Informer(),
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "TemplateInstanceController"),
}
c.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
c.enqueue(obj.(*templateapi.TemplateInstance))
},
UpdateFunc: func(_, obj interface{}) {
c.enqueue(obj.(*templateapi.TemplateInstance))
},
DeleteFunc: func(obj interface{}) {
},
})
return c
}
// getTemplateInstance returns the TemplateInstance from the shared informer,
// given its key (dequeued from c.queue).
func (c *TemplateInstanceController) getTemplateInstance(key string) (*templateapi.TemplateInstance, error) {
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return nil, err
}
return c.lister.TemplateInstances(namespace).Get(name)
}
// copyTemplateInstance returns a deep copy of a TemplateInstance object.
func (c *TemplateInstanceController) copyTemplateInstance(templateInstance *templateapi.TemplateInstance) (*templateapi.TemplateInstance, error) {
templateInstanceCopy, err := kapi.Scheme.DeepCopy(templateInstance)
if err != nil {
return nil, err
}
return templateInstanceCopy.(*templateapi.TemplateInstance), nil
}
// copyTemplate returns a deep copy of a Template object.
func (c *TemplateInstanceController) copyTemplate(template *templateapi.Template) (*templateapi.Template, error) {
templateCopy, err := kapi.Scheme.DeepCopy(template)
if err != nil {
return nil, err
}
return templateCopy.(*templateapi.Template), nil
}
// sync is the actual controller worker function.
func (c *TemplateInstanceController) sync(key string) error {
templateInstance, err := c.getTemplateInstance(key)
if apierrors.IsNotFound(err) {
return nil
}
if err != nil {
return err
}
for _, condition := range templateInstance.Status.Conditions {
if condition.Type == templateapi.TemplateInstanceReady && condition.Status == kapi.ConditionTrue ||
condition.Type == templateapi.TemplateInstanceInstantiateFailure && condition.Status == kapi.ConditionTrue {
return nil
}
}
glog.V(4).Infof("TemplateInstance controller: syncing %s", key)
templateInstance, err = c.copyTemplateInstance(templateInstance)
if err != nil {
return err
}
instantiateErr := c.instantiate(templateInstance)
if instantiateErr != nil {
glog.V(4).Infof("TemplateInstance controller: instantiate %s returned %v", key, instantiateErr)
}
templateInstance.Status.Conditions = templateapi.FilterTemplateInstanceCondition(templateInstance.Status.Conditions, templateapi.TemplateInstanceReady)
templateInstance.Status.Conditions = templateapi.FilterTemplateInstanceCondition(templateInstance.Status.Conditions, templateapi.TemplateInstanceInstantiateFailure)
if instantiateErr == nil {
templateInstance.Status.Conditions = append(templateInstance.Status.Conditions, templateapi.TemplateInstanceCondition{
Type: templateapi.TemplateInstanceReady,
Status: kapi.ConditionTrue,
LastTransitionTime: metav1.Now(),
Reason: "Created",
})
} else {
templateInstance.Status.Conditions = append(templateInstance.Status.Conditions, templateapi.TemplateInstanceCondition{
Type: templateapi.TemplateInstanceInstantiateFailure,
Status: kapi.ConditionTrue,
LastTransitionTime: metav1.Now(),
Reason: "Failed",
Message: instantiateErr.Error(),
})
}
_, err = c.templateclient.TemplateInstances(templateInstance.Namespace).UpdateStatus(templateInstance)
if err != nil {
utilruntime.HandleError(fmt.Errorf("TemplateInstance status update failed: %v", err))
}
return err
}
// Run runs the controller until stopCh is closed, with as many workers as
// specified.
func (c *TemplateInstanceController) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
defer c.queue.ShutDown()
if !cache.WaitForCacheSync(stopCh, c.informer.HasSynced) {
return
}
glog.V(2).Infof("Starting TemplateInstance controller")
for i := 0; i < workers; i++ {
go wait.Until(c.runWorker, time.Second, stopCh)
}
<-stopCh
}
// runWorker repeatedly calls processNextWorkItem until the latter wants to
// exit.
func (c *TemplateInstanceController) runWorker() {
for c.processNextWorkItem() {
}
}
// processNextWorkItem reads from the queue and calls the sync worker function.
// It returns false only when the queue is closed.
func (c *TemplateInstanceController) processNextWorkItem() bool {
key, quit := c.queue.Get()
if quit {
return false
}
defer c.queue.Done(key)
err := c.sync(key.(string))
if err == nil { // for example, success, or the TemplateInstance has gone away
c.queue.Forget(key)
return true
}
utilruntime.HandleError(fmt.Errorf("TemplateInstance %v failed with: %v", key, err))
c.queue.AddRateLimited(key) // avoid hot looping
return true
}
// enqueue adds a TemplateInstance to c.queue. This function is called on the
// shared informer goroutine.
func (c *TemplateInstanceController) enqueue(obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
utilruntime.HandleError(fmt.Errorf("Couldn't get key for object %#v: %v", obj, err))
return
}
c.queue.Add(key)
}
// instantiate instantiates the objects contained in a TemplateInstance. Any
// parameters for instantiation are contained in the Secret linked to the
// TemplateInstance.
func (c *TemplateInstanceController) instantiate(templateInstance *templateapi.TemplateInstance) error {
if templateInstance.Spec.Requester == nil || templateInstance.Spec.Requester.Username == "" {
return fmt.Errorf("spec.requester.username not set")
}
u := &user.DefaultInfo{Name: templateInstance.Spec.Requester.Username}
if err := util.Authorize(c.kc.Authorization().SubjectAccessReviews(), u, &authorization.ResourceAttributes{
Namespace: templateInstance.Namespace,
Verb: "get",
Group: kapi.GroupName,
Resource: "secrets",
}); err != nil {
return err
}
secret, err := c.kc.Core().Secrets(templateInstance.Namespace).Get(templateInstance.Spec.Secret.Name, metav1.GetOptions{})
if err != nil {
return err
}
template, err := c.copyTemplate(&templateInstance.Spec.Template)
if err != nil {
return err
}
// We label all objects we create - this is needed by the template service
// broker.
if template.ObjectLabels == nil {
template.ObjectLabels = make(map[string]string)
}
template.ObjectLabels[templateapi.TemplateInstanceLabel] = templateInstance.Name
for i, param := range template.Parameters {
if value, ok := secret.Data[param.Name]; ok {
template.Parameters[i].Value = string(value)
template.Parameters[i].Generate = ""
}
}
if err := util.Authorize(c.kc.Authorization().SubjectAccessReviews(), u, &authorization.ResourceAttributes{
Namespace: templateInstance.Namespace,
Verb: "create",
Group: templateapi.GroupName,
Resource: "templateconfigs",
}); err != nil {
return err
}
glog.V(4).Infof("TemplateInstance controller: creating TemplateConfig for %s/%s", templateInstance.Namespace, templateInstance.Name)
template, err = c.oc.TemplateConfigs(templateInstance.Namespace).Create(template)
if err != nil {
return err
}
errs := runtime.DecodeList(template.Objects, kapi.Codecs.UniversalDecoder())
if len(errs) > 0 {
return errs[0]
}
// We add an OwnerReference to all objects we create - this is also needed
// by the template service broker for cleanup. TODO: what about any objects
// created by the templateinstance in other namespaces?
for _, obj := range template.Objects {
meta, _ := meta.Accessor(obj)
ref := meta.GetOwnerReferences()
ref = append(ref, metav1.OwnerReference{
APIVersion: templateapiv1.SchemeGroupVersion.String(),
Kind: "TemplateInstance",
Name: templateInstance.Name,
UID: templateInstance.UID,
})
meta.SetOwnerReferences(ref)
}
bulk := cmd.Bulk{
Mapper: &resource.Mapper{
RESTMapper: client.DefaultMultiRESTMapper(),
ObjectTyper: kapi.Scheme,
ClientMapper: resource.ClientMapperFunc(func(mapping *meta.RESTMapping) (resource.RESTClient, error) {
if latest.OriginKind(mapping.GroupVersionKind) {
return c.oc.(*client.Client), nil
}
return c.kc.Core().RESTClient(), nil
}),
},
Op: func(info *resource.Info, namespace string, obj runtime.Object) (runtime.Object, error) {
if len(info.Namespace) > 0 {
namespace = info.Namespace
}
if namespace == "" {
return nil, errors.New("namespace was empty")
}
if info.Mapping.Resource == "" {
return nil, errors.New("resource was empty")
}
if err := util.Authorize(c.kc.Authorization().SubjectAccessReviews(), u, &authorization.ResourceAttributes{
Namespace: namespace,
Verb: "create",
Group: info.Mapping.GroupVersionKind.Group,
Resource: info.Mapping.Resource,
}); err != nil {
return nil, err
}
return obj, nil
},
}
// First, do all the SARs to ensure the requester actually has permissions
// to create.
glog.V(4).Infof("TemplateInstance controller: running SARs for %s/%s", templateInstance.Namespace, templateInstance.Name)
errs = bulk.Run(&kapi.List{Items: template.Objects}, templateInstance.Namespace)
if len(errs) > 0 {
return utilerrors.NewAggregate(errs)
}
bulk.Op = func(info *resource.Info, namespace string, obj runtime.Object) (runtime.Object, error) {
// as cmd.Create, but be tolerant to the existence of objects that we
// created before.
helper := resource.NewHelper(info.Client, info.Mapping)
if len(info.Namespace) > 0 {
namespace = info.Namespace
}
createObj, createErr := helper.Create(namespace, false, obj)
if kerrors.IsAlreadyExists(createErr) {
obj, err := helper.Get(namespace, info.Name, false)
if err != nil {
return createObj, createErr
}
meta, err := meta.Accessor(obj)
if err != nil {
return createObj, createErr
}
if meta.GetLabels()[templateapi.TemplateInstanceLabel] == templateInstance.Name {
return obj, nil
}
}
return createObj, createErr
}
// Second, create the objects, being tolerant if they already exist and are
// labelled as having previously been created by us.
glog.V(4).Infof("TemplateInstance controller: creating objects for %s/%s", templateInstance.Namespace, templateInstance.Name)
errs = bulk.Run(&kapi.List{Items: template.Objects}, templateInstance.Namespace)
if len(errs) > 0 {
return utilerrors.NewAggregate(errs)
}
return nil
}