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pod.go
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pod.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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.
package common
import (
"k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/pkg/api/helper"
api "k8s.io/client-go/pkg/api/v1"
extensions "k8s.io/client-go/pkg/apis/extensions/v1beta1"
)
// FilterPodsByControllerResource returns a subset of pods controlled by given deployment.
func FilterDeploymentPodsByOwnerReference(deployment extensions.Deployment,
allRS []extensions.ReplicaSet, allPods []api.Pod) []api.Pod {
var matchingPods []api.Pod
rsTemplate := api.PodTemplateSpec{
ObjectMeta: deployment.Spec.Template.ObjectMeta,
Spec: deployment.Spec.Template.Spec,
}
for _, rs := range allRS {
if EqualIgnoreHash(rs.Spec.Template, rsTemplate) {
matchingPods = FilterPodsByOwnerReference(rs.Namespace, rs.UID, allPods)
}
}
return matchingPods
}
// FilterPodsByControllerResource returns a subset of pods controlled by given controller resource,
// excluding deployments.
func FilterPodsByOwnerReference(namespace string, uid types.UID, allPods []api.Pod) []api.Pod {
var matchingPods []api.Pod
for _, pod := range allPods {
if pod.Namespace == namespace {
for _, ownerRef := range pod.OwnerReferences {
if ownerRef.Controller != nil && *ownerRef.Controller == true &&
ownerRef.UID == uid {
matchingPods = append(matchingPods, pod)
}
}
}
}
return matchingPods
}
// FilterPodsBySelector returns pods targeted by given resource selector.
func FilterPodsBySelector(pods []api.Pod, resourceSelector map[string]string) []api.Pod {
var matchingPods []api.Pod
for _, pod := range pods {
if IsSelectorMatching(resourceSelector, pod.Labels) {
matchingPods = append(matchingPods, pod)
}
}
return matchingPods
}
// FilterNamespacedPodsByLabelSelector returns pods targeted by given resource label selector in
// given namespace.
func FilterNamespacedPodsByLabelSelector(pods []api.Pod, namespace string,
labelSelector *v1.LabelSelector) []api.Pod {
var matchingPods []api.Pod
for _, pod := range pods {
if pod.ObjectMeta.Namespace == namespace &&
IsLabelSelectorMatching(pod.Labels, labelSelector) {
matchingPods = append(matchingPods, pod)
}
}
return matchingPods
}
// GetContainerImages returns container image strings from the given pod spec.
func GetContainerImages(podTemplate *api.PodSpec) []string {
var containerImages []string
for _, container := range podTemplate.Containers {
containerImages = append(containerImages, container.Image)
}
return containerImages
}
// EqualIgnoreHash returns true if two given podTemplateSpec are equal, ignoring the diff in value of Labels[pod-template-hash]
// We ignore pod-template-hash because the hash result would be different upon podTemplateSpec API changes
// (e.g. the addition of a new field will cause the hash code to change)
// Note that we assume input podTemplateSpecs contain non-empty labels
func EqualIgnoreHash(template1, template2 api.PodTemplateSpec) bool {
// First, compare template.Labels (ignoring hash)
labels1, labels2 := template1.Labels, template2.Labels
if len(labels1) > len(labels2) {
labels1, labels2 = labels2, labels1
}
// We make sure len(labels2) >= len(labels1)
for k, v := range labels2 {
if labels1[k] != v && k != extensions.DefaultDeploymentUniqueLabelKey {
return false
}
}
// Then, compare the templates without comparing their labels
template1.Labels, template2.Labels = nil, nil
return helper.Semantic.DeepEqual(template1, template2)
}