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admission.go
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admission.go
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/*
Copyright 2014 The Kubernetes 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 resourcequota
import (
"fmt"
"io"
"time"
"k8s.io/apiserver/pkg/admission"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
informers "k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion"
kubeapiserveradmission "k8s.io/kubernetes/pkg/kubeapiserver/admission"
"k8s.io/kubernetes/pkg/quota"
resourcequotaapi "k8s.io/kubernetes/plugin/pkg/admission/resourcequota/apis/resourcequota"
"k8s.io/kubernetes/plugin/pkg/admission/resourcequota/apis/resourcequota/validation"
)
// Register registers a plugin
func Register(plugins *admission.Plugins) {
plugins.Register("ResourceQuota",
func(config io.Reader) (admission.Interface, error) {
// load the configuration provided (if any)
configuration, err := LoadConfiguration(config)
if err != nil {
return nil, err
}
// validate the configuration (if any)
if configuration != nil {
if errs := validation.ValidateConfiguration(configuration); len(errs) != 0 {
return nil, errs.ToAggregate()
}
}
return NewResourceQuota(configuration, 5, make(chan struct{}))
})
}
// QuotaAdmission implements an admission controller that can enforce quota constraints
type QuotaAdmission struct {
*admission.Handler
config *resourcequotaapi.Configuration
stopCh <-chan struct{}
quotaConfiguration quota.Configuration
numEvaluators int
quotaAccessor *quotaAccessor
evaluator Evaluator
}
var _ admission.ValidationInterface = &QuotaAdmission{}
var _ = kubeapiserveradmission.WantsInternalKubeClientSet(&QuotaAdmission{})
var _ = kubeapiserveradmission.WantsQuotaConfiguration(&QuotaAdmission{})
type liveLookupEntry struct {
expiry time.Time
items []*api.ResourceQuota
}
// NewResourceQuota configures an admission controller that can enforce quota 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 NewResourceQuota(config *resourcequotaapi.Configuration, numEvaluators int, stopCh <-chan struct{}) (*QuotaAdmission, error) {
quotaAccessor, err := newQuotaAccessor()
if err != nil {
return nil, err
}
return &QuotaAdmission{
Handler: admission.NewHandler(admission.Create, admission.Update),
stopCh: stopCh,
numEvaluators: numEvaluators,
config: config,
quotaAccessor: quotaAccessor,
}, nil
}
func (a *QuotaAdmission) SetInternalKubeClientSet(client internalclientset.Interface) {
a.quotaAccessor.client = client
}
func (a *QuotaAdmission) SetInternalKubeInformerFactory(f informers.SharedInformerFactory) {
a.quotaAccessor.lister = f.Core().InternalVersion().ResourceQuotas().Lister()
}
func (a *QuotaAdmission) SetQuotaConfiguration(c quota.Configuration) {
a.quotaConfiguration = c
a.evaluator = NewQuotaEvaluator(a.quotaAccessor, a.quotaConfiguration, nil, a.config, a.numEvaluators, a.stopCh)
}
// ValidateInitialization ensures an authorizer is set.
func (a *QuotaAdmission) ValidateInitialization() error {
if a.quotaAccessor == nil {
return fmt.Errorf("missing quotaAccessor")
}
if a.quotaAccessor.client == nil {
return fmt.Errorf("missing quotaAccessor.client")
}
if a.quotaAccessor.lister == nil {
return fmt.Errorf("missing quotaAccessor.lister")
}
if a.quotaConfiguration == nil {
return fmt.Errorf("missing quotaConfiguration")
}
if a.evaluator == nil {
return fmt.Errorf("missing evaluator")
}
return nil
}
// Validate makes admission decisions while enforcing quota
func (a *QuotaAdmission) Validate(attr admission.Attributes) (err error) {
// ignore all operations that correspond to sub-resource actions
if attr.GetSubresource() != "" {
return nil
}
// ignore all operations that are not namespaced
if attr.GetNamespace() == "" {
return nil
}
return a.evaluator.Evaluate(attr)
}