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containerMap is used in CPU Manager to store all containers information in the node. containerMap provides a mapping from (pod, container) -> containerID for all containers a pod It is reusable in another component in pkg/kubelet/cm which needs to track changes of all containers in the node. Signed-off-by: Byonggon Chun <bg.chun@samsung.com>
72 lines
2.3 KiB
Go
72 lines
2.3 KiB
Go
/*
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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 containermap
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import (
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"fmt"
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)
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// ContainerMap maps (containerID)->(*v1.Pod, *v1.Container)
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type ContainerMap map[string]struct {
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podUID string
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containerName string
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}
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// NewContainerMap creates a new ContainerMap struct
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func NewContainerMap() ContainerMap {
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return make(ContainerMap)
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}
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// Add adds a mapping of (containerID)->(podUID, containerName) to the ContainerMap
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func (cm ContainerMap) Add(podUID, containerName, containerID string) {
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cm[containerID] = struct {
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podUID string
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containerName string
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}{podUID, containerName}
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}
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// RemoveByContainerID removes a mapping of (containerID)->(podUID, containerName) from the ContainerMap
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func (cm ContainerMap) RemoveByContainerID(containerID string) {
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delete(cm, containerID)
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}
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// RemoveByContainerRef removes a mapping of (containerID)->(podUID, containerName) from the ContainerMap
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func (cm ContainerMap) RemoveByContainerRef(podUID, containerName string) {
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containerID, err := cm.GetContainerID(podUID, containerName)
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if err == nil {
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cm.RemoveByContainerID(containerID)
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}
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}
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// GetContainerID retrieves a ContainerID from the ContainerMap
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func (cm ContainerMap) GetContainerID(podUID, containerName string) (string, error) {
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for key, val := range cm {
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if val.podUID == podUID && val.containerName == containerName {
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return key, nil
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}
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}
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return "", fmt.Errorf("container %s not in ContainerMap for pod %s", containerName, podUID)
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}
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// GetContainerRef retrieves a (podUID, containerName) pair from the ContainerMap
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func (cm ContainerMap) GetContainerRef(containerID string) (string, string, error) {
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if _, exists := cm[containerID]; !exists {
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return "", "", fmt.Errorf("containerID %s not in ContainerMap", containerID)
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}
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return cm[containerID].podUID, cm[containerID].containerName, nil
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}
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