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admission.go
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admission.go
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package clusterresourcequota
import (
"errors"
"io"
"sort"
"sync"
"time"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/admission"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/quota"
utilwait "k8s.io/kubernetes/pkg/util/wait"
"k8s.io/kubernetes/plugin/pkg/admission/resourcequota"
oclient "github.com/openshift/origin/pkg/client"
ocache "github.com/openshift/origin/pkg/client/cache"
oadmission "github.com/openshift/origin/pkg/cmd/server/admission"
"github.com/openshift/origin/pkg/controller/shared"
"github.com/openshift/origin/pkg/quota/controller/clusterquotamapping"
)
func init() {
admission.RegisterPlugin("openshift.io/ClusterResourceQuota",
func(client clientset.Interface, config io.Reader) (admission.Interface, error) {
return NewClusterResourceQuota()
})
}
// clusterQuotaAdmission implements an admission controller that can enforce clusterQuota constraints
type clusterQuotaAdmission struct {
*admission.Handler
// these are used to create the accessor
clusterQuotaLister *ocache.IndexerToClusterResourceQuotaLister
namespaceLister *ocache.IndexerToNamespaceLister
clusterQuotaSynced func() bool
namespaceSynced func() bool
clusterQuotaClient oclient.ClusterResourceQuotasInterface
clusterQuotaMapper clusterquotamapping.ClusterQuotaMapper
lockFactory LockFactory
// these are used to create the evaluator
registry quota.Registry
init sync.Once
evaluator resourcequota.Evaluator
}
var _ oadmission.WantsInformers = &clusterQuotaAdmission{}
var _ oadmission.WantsOpenshiftClient = &clusterQuotaAdmission{}
var _ oadmission.WantsClusterQuotaMapper = &clusterQuotaAdmission{}
var _ oadmission.Validator = &clusterQuotaAdmission{}
const (
timeToWaitForCacheSync = 10 * time.Second
numEvaluatorThreads = 10
)
// NewClusterResourceQuota configures an admission controller that can enforce clusterQuota constraints
// using the provided registry. The registry must have the capability to handle group/kinds that
// are persisted by the server this admission controller is intercepting
func NewClusterResourceQuota() (admission.Interface, error) {
return &clusterQuotaAdmission{
Handler: admission.NewHandler(admission.Create, admission.Update),
lockFactory: NewDefaultLockFactory(),
}, nil
}
// Admit makes admission decisions while enforcing clusterQuota
func (q *clusterQuotaAdmission) Admit(a admission.Attributes) (err error) {
// ignore all operations that correspond to sub-resource actions
if len(a.GetSubresource()) != 0 {
return nil
}
// ignore cluster level resources
if len(a.GetNamespace()) == 0 {
return nil
}
if !q.waitForSyncedStore(time.After(timeToWaitForCacheSync)) {
return admission.NewForbidden(a, errors.New("caches not synchronized"))
}
q.init.Do(func() {
clusterQuotaAccessor := newQuotaAccessor(q.clusterQuotaLister, q.namespaceLister, q.clusterQuotaClient, q.clusterQuotaMapper)
q.evaluator = resourcequota.NewQuotaEvaluator(clusterQuotaAccessor, q.registry, q.lockAquisition, numEvaluatorThreads, utilwait.NeverStop)
})
return q.evaluator.Evaluate(a)
}
func (q *clusterQuotaAdmission) lockAquisition(quotas []kapi.ResourceQuota) func() {
locks := []sync.Locker{}
// acquire the locks in alphabetical order because I'm too lazy to think of something clever
sort.Sort(ByName(quotas))
for _, quota := range quotas {
lock := q.lockFactory.GetLock(quota.Name)
lock.Lock()
locks = append(locks, lock)
}
return func() {
for i := len(locks) - 1; i >= 0; i-- {
locks[i].Unlock()
}
}
}
func (q *clusterQuotaAdmission) waitForSyncedStore(timeout <-chan time.Time) bool {
for !q.clusterQuotaSynced() || !q.namespaceSynced() {
select {
case <-time.After(100 * time.Millisecond):
case <-timeout:
return q.clusterQuotaSynced() && q.namespaceSynced()
}
}
return true
}
func (q *clusterQuotaAdmission) SetOriginQuotaRegistry(registry quota.Registry) {
q.registry = registry
}
func (q *clusterQuotaAdmission) SetInformers(informers shared.InformerFactory) {
q.clusterQuotaLister = informers.ClusterResourceQuotas().Lister()
q.clusterQuotaSynced = informers.ClusterResourceQuotas().Informer().HasSynced
q.namespaceLister = informers.Namespaces().Lister()
q.namespaceSynced = informers.Namespaces().Informer().HasSynced
}
func (q *clusterQuotaAdmission) SetOpenshiftClient(client oclient.Interface) {
q.clusterQuotaClient = client
}
func (q *clusterQuotaAdmission) SetClusterQuotaMapper(clusterQuotaMapper clusterquotamapping.ClusterQuotaMapper) {
q.clusterQuotaMapper = clusterQuotaMapper
}
func (q *clusterQuotaAdmission) Validate() error {
if q.clusterQuotaLister == nil {
return errors.New("missing clusterQuotaLister")
}
if q.namespaceLister == nil {
return errors.New("missing namespaceLister")
}
if q.clusterQuotaClient == nil {
return errors.New("missing clusterQuotaClient")
}
if q.clusterQuotaMapper == nil {
return errors.New("missing clusterQuotaMapper")
}
if q.registry == nil {
return errors.New("missing registry")
}
return nil
}
type ByName []kapi.ResourceQuota
func (v ByName) Len() int { return len(v) }
func (v ByName) Swap(i, j int) { v[i], v[j] = v[j], v[i] }
func (v ByName) Less(i, j int) bool { return v[i].Name < v[j].Name }