113 lines
3.6 KiB
Go
113 lines
3.6 KiB
Go
/*
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Copyright 2020 The cert-manager 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 metrics
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import (
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"context"
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"time"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/util/workqueue"
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cmlisters "github.com/cert-manager/cert-manager/pkg/client/listers/certmanager/v1"
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controllerpkg "github.com/cert-manager/cert-manager/pkg/controller"
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"github.com/cert-manager/cert-manager/pkg/metrics"
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)
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const (
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// ControllerName is the string used to refer to this controller
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// when enabling or disabling it from command line flags.
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ControllerName = "certificates-metrics"
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)
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// controllerWrapper wraps the `controller` structure to make it implement
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// the controllerpkg.queueingController interface
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type controllerWrapper struct {
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*controller
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}
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// This controller is synced on all Certificate 'create', 'update', and
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// 'delete' events which will update the metrics for that Certificate.
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type controller struct {
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certificateLister cmlisters.CertificateLister
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metrics *metrics.Metrics
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}
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func NewController(ctx *controllerpkg.Context) (*controller, workqueue.RateLimitingInterface, []cache.InformerSynced) {
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// create a queue used to queue up items to be processed
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queue := workqueue.NewNamedRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(time.Second*1, time.Second*30), ControllerName)
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// obtain references to all the informers used by this controller
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certificateInformer := ctx.SharedInformerFactory.Certmanager().V1().Certificates()
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// Reconcile over all Certificate events. We do _not_ reconcile on Secret
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// events that are related to Certificates. It is the responsibility of the
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// Certificates controllers to update accordingly.
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certificateInformer.Informer().AddEventHandler(&controllerpkg.QueuingEventHandler{Queue: queue})
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// build a list of InformerSynced functions that will be returned by the
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// Register method. the controller will only begin processing items once all
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// of these informers have synced.
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mustSync := []cache.InformerSynced{
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certificateInformer.Informer().HasSynced,
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}
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return &controller{
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certificateLister: certificateInformer.Lister(),
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metrics: ctx.Metrics,
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}, queue, mustSync
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}
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func (c *controller) ProcessItem(ctx context.Context, key string) error {
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namespace, name, err := cache.SplitMetaNamespaceKey(key)
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if err != nil {
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return nil
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}
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crt, err := c.certificateLister.Certificates(namespace).Get(name)
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if apierrors.IsNotFound(err) {
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// If the Certificate no longer exists, remove it's metrics from being exposed.
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c.metrics.RemoveCertificate(key)
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return nil
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}
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if err != nil {
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return err
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}
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// Update that Certificates metrics
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c.metrics.UpdateCertificate(crt)
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return nil
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}
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func (c *controllerWrapper) Register(ctx *controllerpkg.Context) (workqueue.RateLimitingInterface, []cache.InformerSynced, error) {
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ctrl, queue, mustSync := NewController(ctx)
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c.controller = ctrl
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return queue, mustSync, nil
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}
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func init() {
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controllerpkg.Register(ControllerName, func(ctx *controllerpkg.ContextFactory) (controllerpkg.Interface, error) {
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return controllerpkg.NewBuilder(ctx, ControllerName).
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For(&controllerWrapper{}).
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Complete()
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})
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}
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