292 lines
11 KiB
Go
292 lines
11 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 kuberuntime
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import (
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"encoding/json"
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"strconv"
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"github.com/golang/glog"
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kubetypes "k8s.io/apimachinery/pkg/types"
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"k8s.io/kubernetes/pkg/api/v1"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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"k8s.io/kubernetes/pkg/kubelet/types"
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"k8s.io/kubernetes/pkg/kubelet/util/format"
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)
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const (
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// TODO: change those label names to follow kubernetes's format
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podDeletionGracePeriodLabel = "io.kubernetes.pod.deletionGracePeriod"
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podTerminationGracePeriodLabel = "io.kubernetes.pod.terminationGracePeriod"
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containerHashLabel = "io.kubernetes.container.hash"
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containerRestartCountLabel = "io.kubernetes.container.restartCount"
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containerTerminationMessagePathLabel = "io.kubernetes.container.terminationMessagePath"
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containerTerminationMessagePolicyLabel = "io.kubernetes.container.terminationMessagePolicy"
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containerPreStopHandlerLabel = "io.kubernetes.container.preStopHandler"
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containerPortsLabel = "io.kubernetes.container.ports"
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// kubernetesManagedLabel is used to distinguish whether a container/sandbox is managed by kubelet or not
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kubernetesManagedLabel = "io.kubernetes.managed"
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)
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type labeledPodSandboxInfo struct {
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// Labels from v1.Pod
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Labels map[string]string
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PodName string
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PodNamespace string
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PodUID kubetypes.UID
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}
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type annotatedPodSandboxInfo struct {
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// Annotations from v1.Pod
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Annotations map[string]string
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}
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type labeledContainerInfo struct {
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ContainerName string
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PodName string
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PodNamespace string
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PodUID kubetypes.UID
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}
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type annotatedContainerInfo struct {
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Hash uint64
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RestartCount int
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PodDeletionGracePeriod *int64
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PodTerminationGracePeriod *int64
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TerminationMessagePath string
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TerminationMessagePolicy v1.TerminationMessagePolicy
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PreStopHandler *v1.Handler
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ContainerPorts []v1.ContainerPort
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}
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// newPodLabels creates pod labels from v1.Pod.
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func newPodLabels(pod *v1.Pod) map[string]string {
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labels := map[string]string{}
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// Get labels from v1.Pod
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for k, v := range pod.Labels {
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labels[k] = v
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}
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labels[types.KubernetesPodNameLabel] = pod.Name
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labels[types.KubernetesPodNamespaceLabel] = pod.Namespace
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labels[types.KubernetesPodUIDLabel] = string(pod.UID)
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labels[kubernetesManagedLabel] = "true"
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return labels
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}
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// newPodAnnotations creates pod annotations from v1.Pod.
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func newPodAnnotations(pod *v1.Pod) map[string]string {
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return pod.Annotations
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}
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// newContainerLabels creates container labels from v1.Container and v1.Pod.
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func newContainerLabels(container *v1.Container, pod *v1.Pod) map[string]string {
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labels := map[string]string{}
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labels[types.KubernetesPodNameLabel] = pod.Name
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labels[types.KubernetesPodNamespaceLabel] = pod.Namespace
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labels[types.KubernetesPodUIDLabel] = string(pod.UID)
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labels[types.KubernetesContainerNameLabel] = container.Name
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labels[kubernetesManagedLabel] = "true"
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return labels
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}
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// newContainerAnnotations creates container annotations from v1.Container and v1.Pod.
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func newContainerAnnotations(container *v1.Container, pod *v1.Pod, restartCount int) map[string]string {
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annotations := map[string]string{}
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annotations[containerHashLabel] = strconv.FormatUint(kubecontainer.HashContainer(container), 16)
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annotations[containerRestartCountLabel] = strconv.Itoa(restartCount)
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annotations[containerTerminationMessagePathLabel] = container.TerminationMessagePath
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annotations[containerTerminationMessagePolicyLabel] = string(container.TerminationMessagePolicy)
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if pod.DeletionGracePeriodSeconds != nil {
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annotations[podDeletionGracePeriodLabel] = strconv.FormatInt(*pod.DeletionGracePeriodSeconds, 10)
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}
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if pod.Spec.TerminationGracePeriodSeconds != nil {
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annotations[podTerminationGracePeriodLabel] = strconv.FormatInt(*pod.Spec.TerminationGracePeriodSeconds, 10)
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}
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if container.Lifecycle != nil && container.Lifecycle.PreStop != nil {
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// Using json enconding so that the PreStop handler object is readable after writing as a label
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rawPreStop, err := json.Marshal(container.Lifecycle.PreStop)
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if err != nil {
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glog.Errorf("Unable to marshal lifecycle PreStop handler for container %q of pod %q: %v", container.Name, format.Pod(pod), err)
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} else {
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annotations[containerPreStopHandlerLabel] = string(rawPreStop)
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}
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}
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if len(container.Ports) > 0 {
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rawContainerPorts, err := json.Marshal(container.Ports)
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if err != nil {
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glog.Errorf("Unable to marshal container ports for container %q for pod %q: %v", container.Name, format.Pod(pod), err)
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} else {
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annotations[containerPortsLabel] = string(rawContainerPorts)
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}
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}
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return annotations
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}
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// getPodSandboxInfoFromLabels gets labeledPodSandboxInfo from labels.
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func getPodSandboxInfoFromLabels(labels map[string]string) *labeledPodSandboxInfo {
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podSandboxInfo := &labeledPodSandboxInfo{
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Labels: make(map[string]string),
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PodName: getStringValueFromLabel(labels, types.KubernetesPodNameLabel),
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PodNamespace: getStringValueFromLabel(labels, types.KubernetesPodNamespaceLabel),
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PodUID: kubetypes.UID(getStringValueFromLabel(labels, types.KubernetesPodUIDLabel)),
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}
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// Remain only labels from v1.Pod
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for k, v := range labels {
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if k != types.KubernetesPodNameLabel && k != types.KubernetesPodNamespaceLabel && k != types.KubernetesPodUIDLabel && k != kubernetesManagedLabel {
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podSandboxInfo.Labels[k] = v
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}
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}
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return podSandboxInfo
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}
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// getPodSandboxInfoFromAnnotations gets annotatedPodSandboxInfo from annotations.
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func getPodSandboxInfoFromAnnotations(annotations map[string]string) *annotatedPodSandboxInfo {
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return &annotatedPodSandboxInfo{
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Annotations: annotations,
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}
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}
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// getContainerInfoFromLabels gets labeledContainerInfo from labels.
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func getContainerInfoFromLabels(labels map[string]string) *labeledContainerInfo {
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return &labeledContainerInfo{
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PodName: getStringValueFromLabel(labels, types.KubernetesPodNameLabel),
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PodNamespace: getStringValueFromLabel(labels, types.KubernetesPodNamespaceLabel),
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PodUID: kubetypes.UID(getStringValueFromLabel(labels, types.KubernetesPodUIDLabel)),
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ContainerName: getStringValueFromLabel(labels, types.KubernetesContainerNameLabel),
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}
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}
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// isManagedByKubelet returns true is the sandbox/container is managed by kubelet.
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func isManagedByKubelet(labels map[string]string) bool {
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if _, ok := labels[kubernetesManagedLabel]; ok {
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return true
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}
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return false
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}
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// getContainerInfoFromAnnotations gets annotatedContainerInfo from annotations.
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func getContainerInfoFromAnnotations(annotations map[string]string) *annotatedContainerInfo {
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var err error
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containerInfo := &annotatedContainerInfo{
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TerminationMessagePath: getStringValueFromLabel(annotations, containerTerminationMessagePathLabel),
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TerminationMessagePolicy: v1.TerminationMessagePolicy(getStringValueFromLabel(annotations, containerTerminationMessagePolicyLabel)),
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}
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if containerInfo.Hash, err = getUint64ValueFromLabel(annotations, containerHashLabel); err != nil {
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glog.Errorf("Unable to get %q from annotations %q: %v", containerHashLabel, annotations, err)
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}
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if containerInfo.RestartCount, err = getIntValueFromLabel(annotations, containerRestartCountLabel); err != nil {
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glog.Errorf("Unable to get %q from annotations %q: %v", containerRestartCountLabel, annotations, err)
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}
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if containerInfo.PodDeletionGracePeriod, err = getInt64PointerFromLabel(annotations, podDeletionGracePeriodLabel); err != nil {
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glog.Errorf("Unable to get %q from annotations %q: %v", podDeletionGracePeriodLabel, annotations, err)
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}
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if containerInfo.PodTerminationGracePeriod, err = getInt64PointerFromLabel(annotations, podTerminationGracePeriodLabel); err != nil {
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glog.Errorf("Unable to get %q from annotations %q: %v", podTerminationGracePeriodLabel, annotations, err)
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}
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preStopHandler := &v1.Handler{}
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if found, err := getJSONObjectFromLabel(annotations, containerPreStopHandlerLabel, preStopHandler); err != nil {
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glog.Errorf("Unable to get %q from annotations %q: %v", containerPreStopHandlerLabel, annotations, err)
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} else if found {
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containerInfo.PreStopHandler = preStopHandler
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}
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containerPorts := []v1.ContainerPort{}
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if found, err := getJSONObjectFromLabel(annotations, containerPortsLabel, &containerPorts); err != nil {
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glog.Errorf("Unable to get %q from annotations %q: %v", containerPortsLabel, annotations, err)
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} else if found {
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containerInfo.ContainerPorts = containerPorts
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}
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return containerInfo
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}
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func getStringValueFromLabel(labels map[string]string, label string) string {
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if value, found := labels[label]; found {
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return value
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}
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// Do not report error, because there should be many old containers without label now.
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glog.V(3).Infof("Container doesn't have label %s, it may be an old or invalid container", label)
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// Return empty string "" for these containers, the caller will get value by other ways.
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return ""
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}
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func getIntValueFromLabel(labels map[string]string, label string) (int, error) {
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if strValue, found := labels[label]; found {
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intValue, err := strconv.Atoi(strValue)
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if err != nil {
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// This really should not happen. Just set value to 0 to handle this abnormal case
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return 0, err
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}
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return intValue, nil
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}
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// Do not report error, because there should be many old containers without label now.
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glog.V(3).Infof("Container doesn't have label %s, it may be an old or invalid container", label)
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// Just set the value to 0
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return 0, nil
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}
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func getUint64ValueFromLabel(labels map[string]string, label string) (uint64, error) {
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if strValue, found := labels[label]; found {
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intValue, err := strconv.ParseUint(strValue, 16, 64)
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if err != nil {
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// This really should not happen. Just set value to 0 to handle this abnormal case
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return 0, err
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}
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return intValue, nil
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}
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// Do not report error, because there should be many old containers without label now.
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glog.V(3).Infof("Container doesn't have label %s, it may be an old or invalid container", label)
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// Just set the value to 0
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return 0, nil
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}
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func getInt64PointerFromLabel(labels map[string]string, label string) (*int64, error) {
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if strValue, found := labels[label]; found {
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int64Value, err := strconv.ParseInt(strValue, 10, 64)
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if err != nil {
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return nil, err
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}
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return &int64Value, nil
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}
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// If the label is not found, return pointer nil.
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return nil, nil
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}
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// getJSONObjectFromLabel returns a bool value indicating whether an object is found.
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func getJSONObjectFromLabel(labels map[string]string, label string, value interface{}) (bool, error) {
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if strValue, found := labels[label]; found {
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err := json.Unmarshal([]byte(strValue), value)
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return found, err
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}
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// If the label is not found, return not found.
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return false, nil
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}
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