100 lines
3 KiB
Go
100 lines
3 KiB
Go
|
/*
|
||
|
|
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/kubernetes/pkg/admission"
|
||
|
|
"k8s.io/kubernetes/pkg/api"
|
||
|
|
"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
|
||
|
|
kubeapiserveradmission "k8s.io/kubernetes/pkg/kubeapiserver/admission"
|
||
|
|
"k8s.io/kubernetes/pkg/quota"
|
||
|
|
"k8s.io/kubernetes/pkg/quota/install"
|
||
|
|
)
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
admission.RegisterPlugin("ResourceQuota",
|
||
|
|
func(config io.Reader) (admission.Interface, error) {
|
||
|
|
// NOTE: we do not provide informers to the registry because admission level decisions
|
||
|
|
// does not require us to open watches for all items tracked by quota.
|
||
|
|
registry := install.NewRegistry(nil, nil)
|
||
|
|
return NewResourceQuota(registry, 5, make(chan struct{}))
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
// quotaAdmission implements an admission controller that can enforce quota constraints
|
||
|
|
type quotaAdmission struct {
|
||
|
|
*admission.Handler
|
||
|
|
|
||
|
|
stopCh <-chan struct{}
|
||
|
|
registry quota.Registry
|
||
|
|
numEvaluators int
|
||
|
|
evaluator Evaluator
|
||
|
|
}
|
||
|
|
|
||
|
|
var _ = kubeapiserveradmission.WantsInternalClientSet("aAdmission{})
|
||
|
|
|
||
|
|
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(registry quota.Registry, numEvaluators int, stopCh <-chan struct{}) (admission.Interface, error) {
|
||
|
|
return "aAdmission{
|
||
|
|
Handler: admission.NewHandler(admission.Create, admission.Update),
|
||
|
|
stopCh: stopCh,
|
||
|
|
registry: registry,
|
||
|
|
numEvaluators: numEvaluators,
|
||
|
|
}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (a *quotaAdmission) SetInternalClientSet(client internalclientset.Interface) {
|
||
|
|
var err error
|
||
|
|
quotaAccessor, err := newQuotaAccessor(client)
|
||
|
|
if err != nil {
|
||
|
|
// TODO handle errors more cleanly
|
||
|
|
panic(err)
|
||
|
|
}
|
||
|
|
go quotaAccessor.Run(a.stopCh)
|
||
|
|
|
||
|
|
a.evaluator = NewQuotaEvaluator(quotaAccessor, a.registry, nil, a.numEvaluators, a.stopCh)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Validate ensures an authorizer is set.
|
||
|
|
func (a *quotaAdmission) Validate() error {
|
||
|
|
if a.evaluator == nil {
|
||
|
|
return fmt.Errorf("missing evaluator")
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Admit makes admission decisions while enforcing quota
|
||
|
|
func (q *quotaAdmission) Admit(a admission.Attributes) (err error) {
|
||
|
|
// ignore all operations that correspond to sub-resource actions
|
||
|
|
if a.GetSubresource() != "" {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
return q.evaluator.Evaluate(a)
|
||
|
|
}
|