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/*
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Copyright 2022.
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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 controllers
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import (
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"context"
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"k8s.io/apimachinery/pkg/runtime"
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ctrl "sigs.k8s.io/controller-runtime"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/log"
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demov1 "mashibing.com/demo/app/api/v1"
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)
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// Reconciler对象，里面封装了我们调和函数需要的资源
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// AppReconciler reconciles a App object
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type AppReconciler struct {
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client.Client
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Scheme *runtime.Scheme
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}
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//+kubebuilder:rbac:groups=demo.mashibing.com,resources=apps,verbs=get;list;watch;create;update;patch;delete
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//+kubebuilder:rbac:groups=demo.mashibing.com,resources=apps/status,verbs=get;update;patch
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//+kubebuilder:rbac:groups=demo.mashibing.com,resources=apps/finalizers,verbs=update
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// Reconcile is part of the main kubernetes reconciliation loop which aims to
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// move the current state of the cluster closer to the desired state.
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// TODO(user): Modify the Reconcile function to compare the state specified by
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// the App object against the actual cluster state, and then
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// perform operations to make the cluster state reflect the state specified by
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// the user.
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//
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// For more details, check Reconcile and its Result here:
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// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.13.0/pkg/reconcile
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func (r *AppReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
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_ = log.FromContext(ctx)
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// 获取对象的惯例写法
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app := new(demov1.App)
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// Get（） 会调用实现了 Reader Interface 的对象。
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// 找到了实现的对象为 `delegatingReader` ，它只实现了 Reader 接口
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if err := r.Client.Get(ctx, req.NamespacedName, app); err != nil {
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return ctrl.Result{}, client.IgnoreNotFound(err)
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}
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// create() 会调用实现了 Writer Interface 的对象
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//r.Client.Create()
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return ctrl.Result{}, nil
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}
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// 完成了将 reconciler 加入 controller中，之后将controller加入manager中
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// SetupWithManager sets up the controller with the Manager.
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func (r *AppReconciler) SetupWithManager(mgr ctrl.Manager) error {
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return ctrl.NewControllerManagedBy(mgr). // 创建 controller
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For(&demov1.App{}). // 将我们当前的crd加入“过滤器”可以让controller订阅到crd的变化
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Complete(r) // 最终将 controller 加入，完成创建过程
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}
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