forked from kubeflow/training-operator
/
pod_control.go
177 lines (156 loc) · 6.16 KB
/
pod_control.go
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/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Most code here is copied from Kubernetes, while we change the
// logic about name generation to generate name with type and index.
package control
import (
"fmt"
"github.com/golang/glog"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/record"
"k8s.io/kubernetes/pkg/controller"
)
// Reasons for pod events
const (
// FailedCreatePodReason is added in an event and in a replica set condition
// when a pod for a replica set is failed to be created.
FailedCreatePodReason = "FailedCreatePod"
// SuccessfulCreatePodReason is added in an event when a pod for a replica set
// is successfully created.
SuccessfulCreatePodReason = "SuccessfulCreatePod"
// FailedDeletePodReason is added in an event and in a replica set condition
// when a pod for a replica set is failed to be deleted.
FailedDeletePodReason = "FailedDeletePod"
// SuccessfulDeletePodReason is added in an event when a pod for a replica set
// is successfully deleted.
SuccessfulDeletePodReason = "SuccessfulDeletePod"
)
// RealPodControl is the default implementation of PodControlInterface.
type RealPodControl struct {
KubeClient clientset.Interface
Recorder record.EventRecorder
}
var _ controller.PodControlInterface = &RealPodControl{}
func getPodsLabelSet(template *v1.PodTemplateSpec) labels.Set {
desiredLabels := make(labels.Set)
for k, v := range template.Labels {
desiredLabels[k] = v
}
return desiredLabels
}
func getPodsFinalizers(template *v1.PodTemplateSpec) []string {
desiredFinalizers := make([]string, len(template.Finalizers))
copy(desiredFinalizers, template.Finalizers)
return desiredFinalizers
}
func getPodsAnnotationSet(template *v1.PodTemplateSpec) labels.Set {
desiredAnnotations := make(labels.Set)
for k, v := range template.Annotations {
desiredAnnotations[k] = v
}
return desiredAnnotations
}
func (r RealPodControl) CreatePods(namespace string, template *v1.PodTemplateSpec, object runtime.Object) error {
return r.createPods("", namespace, template, object, nil)
}
func (r RealPodControl) CreatePodsWithControllerRef(namespace string, template *v1.PodTemplateSpec, controllerObject runtime.Object, controllerRef *metav1.OwnerReference) error {
if err := validateControllerRef(controllerRef); err != nil {
return err
}
return r.createPods("", namespace, template, controllerObject, controllerRef)
}
func (r RealPodControl) CreatePodsOnNode(nodeName, namespace string, template *v1.PodTemplateSpec, object runtime.Object, controllerRef *metav1.OwnerReference) error {
if err := validateControllerRef(controllerRef); err != nil {
return err
}
return r.createPods(nodeName, namespace, template, object, controllerRef)
}
func (r RealPodControl) PatchPod(namespace, name string, data []byte) error {
_, err := r.KubeClient.CoreV1().Pods(namespace).Patch(name, types.StrategicMergePatchType, data)
return err
}
func GetPodFromTemplate(template *v1.PodTemplateSpec, parentObject runtime.Object, controllerRef *metav1.OwnerReference) (*v1.Pod, error) {
desiredLabels := getPodsLabelSet(template)
desiredFinalizers := getPodsFinalizers(template)
desiredAnnotations := getPodsAnnotationSet(template)
pod := &v1.Pod{
ObjectMeta: metav1.ObjectMeta{
Labels: desiredLabels,
Annotations: desiredAnnotations,
Name: template.Name,
Finalizers: desiredFinalizers,
},
}
if controllerRef != nil {
pod.OwnerReferences = append(pod.OwnerReferences, *controllerRef)
}
pod.Spec = *template.Spec.DeepCopy()
return pod, nil
}
func (r RealPodControl) createPods(nodeName, namespace string, template *v1.PodTemplateSpec, object runtime.Object, controllerRef *metav1.OwnerReference) error {
pod, err := GetPodFromTemplate(template, object, controllerRef)
if err != nil {
return err
}
if len(nodeName) != 0 {
pod.Spec.NodeName = nodeName
}
if labels.Set(pod.Labels).AsSelectorPreValidated().Empty() {
return fmt.Errorf("unable to create pods, no labels")
}
if newPod, err := r.KubeClient.CoreV1().Pods(namespace).Create(pod); err != nil {
r.Recorder.Eventf(object, v1.EventTypeWarning, FailedCreatePodReason, "Error creating: %v", err)
return err
} else {
accessor, err := meta.Accessor(object)
if err != nil {
glog.Errorf("parentObject does not have ObjectMeta, %v", err)
return nil
}
glog.V(4).Infof("Controller %v created pod %v", accessor.GetName(), newPod.Name)
r.Recorder.Eventf(object, v1.EventTypeNormal, SuccessfulCreatePodReason, "Created pod: %v", newPod.Name)
}
return nil
}
func (r RealPodControl) DeletePod(namespace string, podID string, object runtime.Object) error {
accessor, err := meta.Accessor(object)
if err != nil {
return fmt.Errorf("object does not have ObjectMeta, %v", err)
}
pod, err := r.KubeClient.CoreV1().Pods(namespace).Get(podID, metav1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
return nil
}
return err
}
if pod.DeletionTimestamp != nil {
glog.V(3).Infof("pod %s/%s is terminating, skip deleting", pod.Namespace, pod.Name)
return nil
}
glog.V(2).Infof("Controller %v deleting pod %v/%v", accessor.GetName(), namespace, podID)
if err := r.KubeClient.CoreV1().Pods(namespace).Delete(podID, nil); err != nil {
r.Recorder.Eventf(object, v1.EventTypeWarning, FailedDeletePodReason, "Error deleting: %v", err)
return fmt.Errorf("unable to delete pods: %v", err)
} else {
r.Recorder.Eventf(object, v1.EventTypeNormal, SuccessfulDeletePodReason, "Deleted pod: %v", podID)
}
return nil
}