mirror of
https://github.com/ceph/ceph-csi.git
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5af3fe5deb
this commits add the controller runtime and its dependency to the vendor. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
106 lines
3.6 KiB
Go
106 lines
3.6 KiB
Go
/*
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Copyright 2018 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 handler
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import (
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/client-go/util/workqueue"
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"sigs.k8s.io/controller-runtime/pkg/event"
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"sigs.k8s.io/controller-runtime/pkg/reconcile"
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"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
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)
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var _ EventHandler = &EnqueueRequestsFromMapFunc{}
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// EnqueueRequestsFromMapFunc enqueues Requests by running a transformation function that outputs a collection
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// of reconcile.Requests on each Event. The reconcile.Requests may be for an arbitrary set of objects
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// defined by some user specified transformation of the source Event. (e.g. trigger Reconciler for a set of objects
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// in response to a cluster resize event caused by adding or deleting a Node)
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//
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// EnqueueRequestsFromMapFunc is frequently used to fan-out updates from one object to one or more other
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// objects of a differing type.
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//
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// For UpdateEvents which contain both a new and old object, the transformation function is run on both
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// objects and both sets of Requests are enqueue.
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type EnqueueRequestsFromMapFunc struct {
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// Mapper transforms the argument into a slice of keys to be reconciled
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ToRequests Mapper
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}
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// Create implements EventHandler
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func (e *EnqueueRequestsFromMapFunc) Create(evt event.CreateEvent, q workqueue.RateLimitingInterface) {
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e.mapAndEnqueue(q, MapObject{Meta: evt.Meta, Object: evt.Object})
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}
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// Update implements EventHandler
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func (e *EnqueueRequestsFromMapFunc) Update(evt event.UpdateEvent, q workqueue.RateLimitingInterface) {
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e.mapAndEnqueue(q, MapObject{Meta: evt.MetaOld, Object: evt.ObjectOld})
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e.mapAndEnqueue(q, MapObject{Meta: evt.MetaNew, Object: evt.ObjectNew})
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}
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// Delete implements EventHandler
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func (e *EnqueueRequestsFromMapFunc) Delete(evt event.DeleteEvent, q workqueue.RateLimitingInterface) {
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e.mapAndEnqueue(q, MapObject{Meta: evt.Meta, Object: evt.Object})
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}
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// Generic implements EventHandler
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func (e *EnqueueRequestsFromMapFunc) Generic(evt event.GenericEvent, q workqueue.RateLimitingInterface) {
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e.mapAndEnqueue(q, MapObject{Meta: evt.Meta, Object: evt.Object})
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}
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func (e *EnqueueRequestsFromMapFunc) mapAndEnqueue(q workqueue.RateLimitingInterface, object MapObject) {
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for _, req := range e.ToRequests.Map(object) {
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q.Add(req)
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}
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}
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// EnqueueRequestsFromMapFunc can inject fields into the mapper.
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// InjectFunc implements inject.Injector.
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func (e *EnqueueRequestsFromMapFunc) InjectFunc(f inject.Func) error {
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if f == nil {
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return nil
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}
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return f(e.ToRequests)
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}
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// Mapper maps an object to a collection of keys to be enqueued
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type Mapper interface {
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// Map maps an object
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Map(MapObject) []reconcile.Request
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}
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// MapObject contains information from an event to be transformed into a Request.
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type MapObject struct {
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// Meta is the meta data for an object from an event.
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Meta metav1.Object
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// Object is the object from an event.
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Object runtime.Object
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}
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var _ Mapper = ToRequestsFunc(nil)
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// ToRequestsFunc implements Mapper using a function.
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type ToRequestsFunc func(MapObject) []reconcile.Request
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// Map implements Mapper
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func (m ToRequestsFunc) Map(i MapObject) []reconcile.Request {
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return m(i)
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}
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