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labels.go
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labels.go
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/*
Copyright 2016 The Kubernetes Authors.
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 kuberuntime
import (
"encoding/json"
"strconv"
"github.com/golang/glog"
"k8s.io/api/core/v1"
kubetypes "k8s.io/apimachinery/pkg/types"
utilfeature "k8s.io/apiserver/pkg/util/feature"
"k8s.io/kubernetes/pkg/features"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/types"
"k8s.io/kubernetes/pkg/kubelet/util/format"
)
const (
// TODO: change those label names to follow kubernetes's format
podDeletionGracePeriodLabel = "io.kubernetes.pod.deletionGracePeriod"
podTerminationGracePeriodLabel = "io.kubernetes.pod.terminationGracePeriod"
containerHashLabel = "io.kubernetes.container.hash"
containerRestartCountLabel = "io.kubernetes.container.restartCount"
containerTerminationMessagePathLabel = "io.kubernetes.container.terminationMessagePath"
containerTerminationMessagePolicyLabel = "io.kubernetes.container.terminationMessagePolicy"
containerPreStopHandlerLabel = "io.kubernetes.container.preStopHandler"
containerPortsLabel = "io.kubernetes.container.ports"
)
type labeledPodSandboxInfo struct {
// Labels from v1.Pod
Labels map[string]string
PodName string
PodNamespace string
PodUID kubetypes.UID
}
type annotatedPodSandboxInfo struct {
// Annotations from v1.Pod
Annotations map[string]string
}
type labeledContainerInfo struct {
ContainerName string
ContainerType kubecontainer.ContainerType
PodName string
PodNamespace string
PodUID kubetypes.UID
}
type annotatedContainerInfo struct {
Hash uint64
RestartCount int
PodDeletionGracePeriod *int64
PodTerminationGracePeriod *int64
TerminationMessagePath string
TerminationMessagePolicy v1.TerminationMessagePolicy
PreStopHandler *v1.Handler
ContainerPorts []v1.ContainerPort
}
// newPodLabels creates pod labels from v1.Pod.
func newPodLabels(pod *v1.Pod) map[string]string {
labels := map[string]string{}
// Get labels from v1.Pod
for k, v := range pod.Labels {
labels[k] = v
}
labels[types.KubernetesPodNameLabel] = pod.Name
labels[types.KubernetesPodNamespaceLabel] = pod.Namespace
labels[types.KubernetesPodUIDLabel] = string(pod.UID)
return labels
}
// newPodAnnotations creates pod annotations from v1.Pod.
func newPodAnnotations(pod *v1.Pod) map[string]string {
return pod.Annotations
}
// newContainerLabels creates container labels from v1.Container and v1.Pod.
func newContainerLabels(container *v1.Container, pod *v1.Pod, containerType kubecontainer.ContainerType) map[string]string {
labels := map[string]string{}
labels[types.KubernetesPodNameLabel] = pod.Name
labels[types.KubernetesPodNamespaceLabel] = pod.Namespace
labels[types.KubernetesPodUIDLabel] = string(pod.UID)
labels[types.KubernetesContainerNameLabel] = container.Name
if utilfeature.DefaultFeatureGate.Enabled(features.DebugContainers) {
labels[types.KubernetesContainerTypeLabel] = string(containerType)
}
return labels
}
// newContainerAnnotations creates container annotations from v1.Container and v1.Pod.
func newContainerAnnotations(container *v1.Container, pod *v1.Pod, restartCount int, opts *kubecontainer.RunContainerOptions) map[string]string {
annotations := map[string]string{}
// Kubelet always overrides device plugin annotations if they are conflicting
for _, a := range opts.Annotations {
annotations[a.Name] = a.Value
}
annotations[containerHashLabel] = strconv.FormatUint(kubecontainer.HashContainer(container), 16)
annotations[containerRestartCountLabel] = strconv.Itoa(restartCount)
annotations[containerTerminationMessagePathLabel] = container.TerminationMessagePath
annotations[containerTerminationMessagePolicyLabel] = string(container.TerminationMessagePolicy)
if pod.DeletionGracePeriodSeconds != nil {
annotations[podDeletionGracePeriodLabel] = strconv.FormatInt(*pod.DeletionGracePeriodSeconds, 10)
}
if pod.Spec.TerminationGracePeriodSeconds != nil {
annotations[podTerminationGracePeriodLabel] = strconv.FormatInt(*pod.Spec.TerminationGracePeriodSeconds, 10)
}
if container.Lifecycle != nil && container.Lifecycle.PreStop != nil {
// Using json encoding so that the PreStop handler object is readable after writing as a label
rawPreStop, err := json.Marshal(container.Lifecycle.PreStop)
if err != nil {
glog.Errorf("Unable to marshal lifecycle PreStop handler for container %q of pod %q: %v", container.Name, format.Pod(pod), err)
} else {
annotations[containerPreStopHandlerLabel] = string(rawPreStop)
}
}
if len(container.Ports) > 0 {
rawContainerPorts, err := json.Marshal(container.Ports)
if err != nil {
glog.Errorf("Unable to marshal container ports for container %q for pod %q: %v", container.Name, format.Pod(pod), err)
} else {
annotations[containerPortsLabel] = string(rawContainerPorts)
}
}
return annotations
}
// getPodSandboxInfoFromLabels gets labeledPodSandboxInfo from labels.
func getPodSandboxInfoFromLabels(labels map[string]string) *labeledPodSandboxInfo {
podSandboxInfo := &labeledPodSandboxInfo{
Labels: make(map[string]string),
PodName: getStringValueFromLabel(labels, types.KubernetesPodNameLabel),
PodNamespace: getStringValueFromLabel(labels, types.KubernetesPodNamespaceLabel),
PodUID: kubetypes.UID(getStringValueFromLabel(labels, types.KubernetesPodUIDLabel)),
}
// Remain only labels from v1.Pod
for k, v := range labels {
if k != types.KubernetesPodNameLabel && k != types.KubernetesPodNamespaceLabel && k != types.KubernetesPodUIDLabel {
podSandboxInfo.Labels[k] = v
}
}
return podSandboxInfo
}
// getPodSandboxInfoFromAnnotations gets annotatedPodSandboxInfo from annotations.
func getPodSandboxInfoFromAnnotations(annotations map[string]string) *annotatedPodSandboxInfo {
return &annotatedPodSandboxInfo{
Annotations: annotations,
}
}
// getContainerInfoFromLabels gets labeledContainerInfo from labels.
func getContainerInfoFromLabels(labels map[string]string) *labeledContainerInfo {
var containerType kubecontainer.ContainerType
if utilfeature.DefaultFeatureGate.Enabled(features.DebugContainers) {
containerType = kubecontainer.ContainerType(getStringValueFromLabel(labels, types.KubernetesContainerTypeLabel))
}
return &labeledContainerInfo{
PodName: getStringValueFromLabel(labels, types.KubernetesPodNameLabel),
PodNamespace: getStringValueFromLabel(labels, types.KubernetesPodNamespaceLabel),
PodUID: kubetypes.UID(getStringValueFromLabel(labels, types.KubernetesPodUIDLabel)),
ContainerName: getStringValueFromLabel(labels, types.KubernetesContainerNameLabel),
ContainerType: containerType,
}
}
// getContainerInfoFromAnnotations gets annotatedContainerInfo from annotations.
func getContainerInfoFromAnnotations(annotations map[string]string) *annotatedContainerInfo {
var err error
containerInfo := &annotatedContainerInfo{
TerminationMessagePath: getStringValueFromLabel(annotations, containerTerminationMessagePathLabel),
TerminationMessagePolicy: v1.TerminationMessagePolicy(getStringValueFromLabel(annotations, containerTerminationMessagePolicyLabel)),
}
if containerInfo.Hash, err = getUint64ValueFromLabel(annotations, containerHashLabel); err != nil {
glog.Errorf("Unable to get %q from annotations %q: %v", containerHashLabel, annotations, err)
}
if containerInfo.RestartCount, err = getIntValueFromLabel(annotations, containerRestartCountLabel); err != nil {
glog.Errorf("Unable to get %q from annotations %q: %v", containerRestartCountLabel, annotations, err)
}
if containerInfo.PodDeletionGracePeriod, err = getInt64PointerFromLabel(annotations, podDeletionGracePeriodLabel); err != nil {
glog.Errorf("Unable to get %q from annotations %q: %v", podDeletionGracePeriodLabel, annotations, err)
}
if containerInfo.PodTerminationGracePeriod, err = getInt64PointerFromLabel(annotations, podTerminationGracePeriodLabel); err != nil {
glog.Errorf("Unable to get %q from annotations %q: %v", podTerminationGracePeriodLabel, annotations, err)
}
preStopHandler := &v1.Handler{}
if found, err := getJSONObjectFromLabel(annotations, containerPreStopHandlerLabel, preStopHandler); err != nil {
glog.Errorf("Unable to get %q from annotations %q: %v", containerPreStopHandlerLabel, annotations, err)
} else if found {
containerInfo.PreStopHandler = preStopHandler
}
containerPorts := []v1.ContainerPort{}
if found, err := getJSONObjectFromLabel(annotations, containerPortsLabel, &containerPorts); err != nil {
glog.Errorf("Unable to get %q from annotations %q: %v", containerPortsLabel, annotations, err)
} else if found {
containerInfo.ContainerPorts = containerPorts
}
return containerInfo
}
func getStringValueFromLabel(labels map[string]string, label string) string {
if value, found := labels[label]; found {
return value
}
// Do not report error, because there should be many old containers without label now.
glog.V(3).Infof("Container doesn't have label %s, it may be an old or invalid container", label)
// Return empty string "" for these containers, the caller will get value by other ways.
return ""
}
func getIntValueFromLabel(labels map[string]string, label string) (int, error) {
if strValue, found := labels[label]; found {
intValue, err := strconv.Atoi(strValue)
if err != nil {
// This really should not happen. Just set value to 0 to handle this abnormal case
return 0, err
}
return intValue, nil
}
// Do not report error, because there should be many old containers without label now.
glog.V(3).Infof("Container doesn't have label %s, it may be an old or invalid container", label)
// Just set the value to 0
return 0, nil
}
func getUint64ValueFromLabel(labels map[string]string, label string) (uint64, error) {
if strValue, found := labels[label]; found {
intValue, err := strconv.ParseUint(strValue, 16, 64)
if err != nil {
// This really should not happen. Just set value to 0 to handle this abnormal case
return 0, err
}
return intValue, nil
}
// Do not report error, because there should be many old containers without label now.
glog.V(3).Infof("Container doesn't have label %s, it may be an old or invalid container", label)
// Just set the value to 0
return 0, nil
}
func getInt64PointerFromLabel(labels map[string]string, label string) (*int64, error) {
if strValue, found := labels[label]; found {
int64Value, err := strconv.ParseInt(strValue, 10, 64)
if err != nil {
return nil, err
}
return &int64Value, nil
}
// If the label is not found, return pointer nil.
return nil, nil
}
// getJSONObjectFromLabel returns a bool value indicating whether an object is found.
func getJSONObjectFromLabel(labels map[string]string, label string, value interface{}) (bool, error) {
if strValue, found := labels[label]; found {
err := json.Unmarshal([]byte(strValue), value)
return found, err
}
// If the label is not found, return not found.
return false, nil
}