69 lines
2.3 KiB
Go
69 lines
2.3 KiB
Go
/*
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Copyright 2016 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 simulator
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import (
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kube_api "k8s.io/kubernetes/pkg/api"
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kube_client "k8s.io/kubernetes/pkg/client/unversioned"
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"k8s.io/kubernetes/pkg/fields"
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cmd "k8s.io/kubernetes/pkg/kubectl/cmd"
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"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
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)
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// GetRequiredPodsForNode returns a list od pods that would appear on the node if the
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// node was just created (like deamonset and manifest-run pods). It reuses kubectl
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// drain command to get the list.
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func GetRequiredPodsForNode(nodename string, client *kube_client.Client) ([]*kube_api.Pod, error) {
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podsToRemoveList, _, _, err := cmd.GetPodsForDeletionOnNodeDrain(client, nodename,
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kube_api.Codecs.UniversalDecoder(), true, true)
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if err != nil {
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return []*kube_api.Pod{}, err
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}
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podsToRemoveMap := make(map[string]struct{})
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for _, pod := range podsToRemoveList {
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podsToRemoveMap[pod.SelfLink] = struct{}{}
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}
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allPodList, err := client.Pods(kube_api.NamespaceAll).List(
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kube_api.ListOptions{FieldSelector: fields.SelectorFromSet(fields.Set{"spec.nodeName": nodename})})
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if err != nil {
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return []*kube_api.Pod{}, err
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}
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podsOnNewNode := make([]*kube_api.Pod, 0)
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for i, pod := range allPodList.Items {
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if _, found := podsToRemoveMap[pod.SelfLink]; !found {
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podsOnNewNode = append(podsOnNewNode, &allPodList.Items[i])
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}
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}
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return podsOnNewNode, nil
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}
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// BuildNodeInfoForNode build a NodeInfo structure for the given node as if the node was just created.
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func BuildNodeInfoForNode(node *kube_api.Node, client *kube_client.Client) (*schedulercache.NodeInfo, error) {
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requiredPods, err := GetRequiredPodsForNode(node.Name, client)
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if err != nil {
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return nil, err
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}
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result := schedulercache.NewNodeInfo(requiredPods...)
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if err := result.SetNode(node); err != nil {
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return nil, err
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}
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return result, nil
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}
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