99 lines
3 KiB
Go
99 lines
3 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package resourcequota
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import (
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"fmt"
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"io"
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"time"
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"k8s.io/apiserver/pkg/admission"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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kubeapiserveradmission "k8s.io/kubernetes/pkg/kubeapiserver/admission"
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"k8s.io/kubernetes/pkg/quota"
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"k8s.io/kubernetes/pkg/quota/install"
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)
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func init() {
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admission.RegisterPlugin("ResourceQuota",
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func(config io.Reader) (admission.Interface, error) {
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// NOTE: we do not provide informers to the registry because admission level decisions
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// does not require us to open watches for all items tracked by quota.
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registry := install.NewRegistry(nil, nil)
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return NewResourceQuota(registry, 5, make(chan struct{}))
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})
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}
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// quotaAdmission implements an admission controller that can enforce quota constraints
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type quotaAdmission struct {
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*admission.Handler
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stopCh <-chan struct{}
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registry quota.Registry
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numEvaluators int
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evaluator Evaluator
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}
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var _ = kubeapiserveradmission.WantsInternalClientSet("aAdmission{})
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type liveLookupEntry struct {
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expiry time.Time
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items []*api.ResourceQuota
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}
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// NewResourceQuota configures an admission controller that can enforce quota constraints
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// using the provided registry. The registry must have the capability to handle group/kinds that
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// are persisted by the server this admission controller is intercepting
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func NewResourceQuota(registry quota.Registry, numEvaluators int, stopCh <-chan struct{}) (admission.Interface, error) {
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return "aAdmission{
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Handler: admission.NewHandler(admission.Create, admission.Update),
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stopCh: stopCh,
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registry: registry,
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numEvaluators: numEvaluators,
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}, nil
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}
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func (a *quotaAdmission) SetInternalClientSet(client internalclientset.Interface) {
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var err error
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quotaAccessor, err := newQuotaAccessor(client)
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if err != nil {
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// TODO handle errors more cleanly
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panic(err)
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}
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go quotaAccessor.Run(a.stopCh)
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a.evaluator = NewQuotaEvaluator(quotaAccessor, a.registry, nil, a.numEvaluators, a.stopCh)
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}
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// Validate ensures an authorizer is set.
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func (a *quotaAdmission) Validate() error {
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if a.evaluator == nil {
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return fmt.Errorf("missing evaluator")
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}
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return nil
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}
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// Admit makes admission decisions while enforcing quota
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func (q *quotaAdmission) Admit(a admission.Attributes) (err error) {
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// ignore all operations that correspond to sub-resource actions
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if a.GetSubresource() != "" {
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return nil
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}
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return q.evaluator.Evaluate(a)
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}
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