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Adding a DeploymentDescriber to kubectl
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| /* | ||
| Copyright 2015 The Kubernetes Authors 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 deployment | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "hash/adler32" | ||
|
|
||
| "k8s.io/kubernetes/pkg/api" | ||
| "k8s.io/kubernetes/pkg/apis/experimental" | ||
| client "k8s.io/kubernetes/pkg/client/unversioned" | ||
| "k8s.io/kubernetes/pkg/fields" | ||
| "k8s.io/kubernetes/pkg/labels" | ||
| "k8s.io/kubernetes/pkg/util" | ||
| ) | ||
|
|
||
| // Returns the old RCs targetted by the given Deployment. | ||
| func GetOldRCs(deployment experimental.Deployment, c client.Interface) ([]*api.ReplicationController, error) { | ||
| namespace := deployment.ObjectMeta.Namespace | ||
| // 1. Find all pods whose labels match deployment.Spec.Selector | ||
| podList, err := c.Pods(namespace).List(labels.SelectorFromSet(deployment.Spec.Selector), fields.Everything()) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error listing pods: %v", err) | ||
| } | ||
| // 2. Find the corresponding RCs for pods in podList. | ||
| // TODO: Right now we list all RCs and then filter. We should add an API for this. | ||
| oldRCs := map[string]api.ReplicationController{} | ||
| rcList, err := c.ReplicationControllers(namespace).List(labels.Everything()) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error listing replication controllers: %v", err) | ||
| } | ||
| for _, pod := range podList.Items { | ||
| podLabelsSelector := labels.Set(pod.ObjectMeta.Labels) | ||
| for _, rc := range rcList.Items { | ||
| rcLabelsSelector := labels.SelectorFromSet(rc.Spec.Selector) | ||
| if rcLabelsSelector.Matches(podLabelsSelector) { | ||
| // Filter out RC that has the same pod template spec as the deployment - that is the new RC. | ||
| if api.Semantic.DeepEqual(rc.Spec.Template, GetNewRCTemplate(deployment)) { | ||
| continue | ||
| } | ||
| oldRCs[rc.ObjectMeta.Name] = rc | ||
| } | ||
| } | ||
| } | ||
| requiredRCs := []*api.ReplicationController{} | ||
| for _, value := range oldRCs { | ||
| requiredRCs = append(requiredRCs, &value) | ||
| } | ||
| return requiredRCs, nil | ||
| } | ||
|
|
||
| // Returns an RC that matches the intent of the given deployment. | ||
| // Returns nil if the new RC doesnt exist yet. | ||
| func GetNewRC(deployment experimental.Deployment, c client.Interface) (*api.ReplicationController, error) { | ||
| namespace := deployment.ObjectMeta.Namespace | ||
| rcList, err := c.ReplicationControllers(namespace).List(labels.Everything()) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error listing replication controllers: %v", err) | ||
| } | ||
| newRCTemplate := GetNewRCTemplate(deployment) | ||
|
|
||
| for _, rc := range rcList.Items { | ||
| if api.Semantic.DeepEqual(rc.Spec.Template, newRCTemplate) { | ||
| // This is the new RC. | ||
| return &rc, nil | ||
| } | ||
| } | ||
| // new RC does not exist. | ||
| return nil, nil | ||
| } | ||
|
|
||
| // Returns the desired PodTemplateSpec for the new RC corresponding to the given RC. | ||
| func GetNewRCTemplate(deployment experimental.Deployment) *api.PodTemplateSpec { | ||
| // newRC will have the same template as in deployment spec, plus a unique label in some cases. | ||
| newRCTemplate := &api.PodTemplateSpec{ | ||
| ObjectMeta: deployment.Spec.Template.ObjectMeta, | ||
| Spec: deployment.Spec.Template.Spec, | ||
| } | ||
| podTemplateSpecHash := GetPodTemplateSpecHash(newRCTemplate) | ||
| if deployment.Spec.UniqueLabelKey != "" { | ||
| newLabels := map[string]string{} | ||
| for key, value := range deployment.Spec.Template.ObjectMeta.Labels { | ||
| newLabels[key] = value | ||
| } | ||
| newLabels[deployment.Spec.UniqueLabelKey] = fmt.Sprintf("%d", podTemplateSpecHash) | ||
| newRCTemplate.ObjectMeta.Labels = newLabels | ||
| } | ||
| return newRCTemplate | ||
| } | ||
|
|
||
| func GetPodTemplateSpecHash(template *api.PodTemplateSpec) uint32 { | ||
| podTemplateSpecHasher := adler32.New() | ||
| util.DeepHashObject(podTemplateSpecHasher, template) | ||
| return podTemplateSpecHasher.Sum32() | ||
| } |