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Mengqi Yu
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🏃 add an example for CRD
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6 files changed

+406
-3
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6 files changed

+406
-3
lines changed

‎examples/crd/main.go

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/*
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Copyright 2019 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 main
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import (
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"context"
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"math/rand"
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"os"
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"time"
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corev1 "k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/runtime"
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_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
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ctrl "sigs.k8s.io/controller-runtime"
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api "sigs.k8s.io/controller-runtime/examples/crd/pkg"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/log/zap"
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)
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var (
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setupLog = ctrl.Log.WithName("setup")
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recLog = ctrl.Log.WithName("reconciler")
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)
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type reconciler struct {
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client.Client
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scheme *runtime.Scheme
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}
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func (r *reconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
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log := recLog.WithValues("chaospod", req.NamespacedName)
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log.V(1).Info("reconciling chaos pod")
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ctx := context.Background()
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var chaospod api.ChaosPod
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if err := r.Get(ctx, req.NamespacedName, &chaospod); err != nil {
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log.Error(err, "unable to get chaosctl")
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return ctrl.Result{}, err
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}
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var pod corev1.Pod
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podFound := true
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if err := r.Get(ctx, req.NamespacedName, &pod); err != nil {
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if !apierrors.IsNotFound(err) {
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log.Error(err, "unable to get pod")
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return ctrl.Result{}, err
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}
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podFound = false
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}
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if podFound {
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shouldStop := chaospod.Spec.NextStop.Time.Before(time.Now())
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if !shouldStop {
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return ctrl.Result{RequeueAfter: chaospod.Spec.NextStop.Sub(time.Now()) + 1*time.Second}, nil
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}
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if err := r.Delete(ctx, &pod); err != nil {
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log.Error(err, "unable to delete pod")
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return ctrl.Result{}, err
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}
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return ctrl.Result{Requeue: true}, nil
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}
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templ := chaospod.Spec.Template.DeepCopy()
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pod.ObjectMeta = templ.ObjectMeta
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pod.Name = req.Name
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pod.Namespace = req.Namespace
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pod.Spec = templ.Spec
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if err := ctrl.SetControllerReference(&chaospod, &pod, r.scheme); err != nil {
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log.Error(err, "unable to set pod's owner reference")
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return ctrl.Result{}, err
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}
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if err := r.Create(ctx, &pod); err != nil {
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log.Error(err, "unable to create pod")
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return ctrl.Result{}, err
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}
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chaospod.Spec.NextStop.Time = time.Now().Add(time.Duration(10*(rand.Int63n(2)+1)) * time.Second)
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chaospod.Status.LastRun = pod.CreationTimestamp
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if err := r.Update(ctx, &chaospod); err != nil {
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log.Error(err, "unable to update chaosctl status")
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return ctrl.Result{}, err
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}
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return ctrl.Result{}, nil
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}
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func main() {
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ctrl.SetLogger(zap.Logger(true))
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mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{})
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if err != nil {
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setupLog.Error(err, "unable to start manager")
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os.Exit(1)
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}
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// in a real controller, we'd create a new scheme for this
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err = api.AddToScheme(mgr.GetScheme())
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if err != nil {
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setupLog.Error(err, "unable to add scheme")
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os.Exit(1)
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}
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err = ctrl.NewControllerManagedBy(mgr).
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For(&api.ChaosPod{}).
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Owns(&corev1.Pod{}).
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Complete(&reconciler{
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Client: mgr.GetClient(),
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scheme: mgr.GetScheme(),
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})
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if err != nil {
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setupLog.Error(err, "unable to create controller")
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os.Exit(1)
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}
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setupLog.Info("starting manager")
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if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
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setupLog.Error(err, "problem running manager")
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os.Exit(1)
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}
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}

‎examples/crd/pkg/doc.go

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/*
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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 pkg
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import (
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logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
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)
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var log = logf.Log.WithName("chaospod-resource")

‎examples/crd/pkg/resource.go

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/*
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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 pkg
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import (
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"fmt"
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"time"
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corev1 "k8s.io/api/core/v1"
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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/apimachinery/pkg/runtime/schema"
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"sigs.k8s.io/controller-runtime/pkg/scheme"
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"sigs.k8s.io/controller-runtime/pkg/webhook"
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)
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// ChaosPodSpec defines the desired state of ChaosPod
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type ChaosPodSpec struct {
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Template corev1.PodTemplateSpec `json:"template"`
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// +optional
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NextStop metav1.Time `json:"nextStop,omitempty"`
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}
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// ChaosPodStatus defines the observed state of ChaosPod.
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// It should always be reconstructable from the state of the cluster and/or outside world.
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type ChaosPodStatus struct {
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LastRun metav1.Time `json:"lastRun,omitempty"`
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}
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// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
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// ChaosPod is the Schema for the randomjobs API
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// +kubebuilder:printcolumn:name="next stop",type="string",JSONPath=".spec.nextStop",format="date"
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// +kubebuilder:printcolumn:name="last run",type="string",JSONPath=".status.lastRun",format="date"
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// +k8s:openapi-gen=true
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type ChaosPod struct {
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metav1.TypeMeta `json:",inline"`
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metav1.ObjectMeta `json:"metadata,omitempty"`
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Spec ChaosPodSpec `json:"spec,omitempty"`
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Status ChaosPodStatus `json:"status,omitempty"`
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}
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// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
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// ChaosPodList contains a list of ChaosPod
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type ChaosPodList struct {
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metav1.TypeMeta `json:",inline"`
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metav1.ListMeta `json:"metadata,omitempty"`
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Items []ChaosPod `json:"items"`
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}
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// ValidateCreate implements webhookutil.validator so a webhook will be registered for the type
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func (c *ChaosPod) ValidateCreate() error {
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log.Info("validate create", "name", c.Name)
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if c.Spec.NextStop.Before(&metav1.Time{Time: time.Now()}) {
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return fmt.Errorf(".spec.nextStop must be later than current time")
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}
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return nil
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}
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// ValidateUpdate implements webhookutil.validator so a webhook will be registered for the type
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func (c *ChaosPod) ValidateUpdate(old runtime.Object) error {
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log.Info("validate update", "name", c.Name)
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if c.Spec.NextStop.Before(&metav1.Time{Time: time.Now()}) {
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return fmt.Errorf(".spec.nextStop must be later than current time")
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}
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oldC, ok := old.(*ChaosPod)
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if !ok {
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return fmt.Errorf("expect old object to be a %T instead of %T", oldC, old)
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}
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if c.Spec.NextStop.After(oldC.Spec.NextStop.Add(time.Hour)) {
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return fmt.Errorf("it is not allowed to delay.spec.nextStop for more than 1 hour")
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}
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return nil
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}
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var _ webhook.Defaulter = &ChaosPod{}
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// Default implements webhookutil.defaulter so a webhook will be registered for the type
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func (c *ChaosPod) Default() {
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log.Info("default", "name", c.Name)
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if c.Spec.NextStop.Before(&metav1.Time{Time: time.Now()}) {
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c.Spec.NextStop = metav1.Time{Time: time.Now().Add(time.Minute)}
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}
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}
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func init() {
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SchemeBuilder.Register(&ChaosPod{}, &ChaosPodList{})
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}
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var (
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// SchemeGroupVersion is group version used to register these objects
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SchemeGroupVersion = schema.GroupVersion{Group: "chaosapps.metamagical.io", Version: "v1"}
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// SchemeBuilder is used to add go types to the GroupVersionKind scheme
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SchemeBuilder = &scheme.Builder{GroupVersion: SchemeGroupVersion}
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// AddToScheme is required by pkg/client/...
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AddToScheme = SchemeBuilder.AddToScheme
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)

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