296 lines
9.3 KiB
Go
296 lines
9.3 KiB
Go
/*
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Copyright 2015 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 pod
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import (
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"fmt"
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"time"
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"k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/intstr"
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)
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// FindPort locates the container port for the given pod and portName. If the
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// targetPort is a number, use that. If the targetPort is a string, look that
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// string up in all named ports in all containers in the target pod. If no
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// match is found, fail.
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func FindPort(pod *v1.Pod, svcPort *v1.ServicePort) (int, error) {
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portName := svcPort.TargetPort
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switch portName.Type {
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case intstr.String:
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name := portName.StrVal
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for _, container := range pod.Spec.Containers {
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for _, port := range container.Ports {
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if port.Name == name && port.Protocol == svcPort.Protocol {
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return int(port.ContainerPort), nil
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}
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}
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}
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case intstr.Int:
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return portName.IntValue(), nil
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}
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return 0, fmt.Errorf("no suitable port for manifest: %s", pod.UID)
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}
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// Visitor is called with each object name, and returns true if visiting should continue
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type Visitor func(name string) (shouldContinue bool)
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// VisitPodSecretNames invokes the visitor function with the name of every secret
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// referenced by the pod spec. If visitor returns false, visiting is short-circuited.
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// Transitive references (e.g. pod -> pvc -> pv -> secret) are not visited.
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// Returns true if visiting completed, false if visiting was short-circuited.
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func VisitPodSecretNames(pod *v1.Pod, visitor Visitor) bool {
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for _, reference := range pod.Spec.ImagePullSecrets {
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if !visitor(reference.Name) {
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return false
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}
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}
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for i := range pod.Spec.InitContainers {
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if !visitContainerSecretNames(&pod.Spec.InitContainers[i], visitor) {
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return false
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}
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}
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for i := range pod.Spec.Containers {
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if !visitContainerSecretNames(&pod.Spec.Containers[i], visitor) {
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return false
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}
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}
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var source *v1.VolumeSource
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for i := range pod.Spec.Volumes {
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source = &pod.Spec.Volumes[i].VolumeSource
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switch {
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case source.AzureFile != nil:
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if len(source.AzureFile.SecretName) > 0 && !visitor(source.AzureFile.SecretName) {
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return false
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}
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case source.CephFS != nil:
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if source.CephFS.SecretRef != nil && !visitor(source.CephFS.SecretRef.Name) {
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return false
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}
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case source.FlexVolume != nil:
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if source.FlexVolume.SecretRef != nil && !visitor(source.FlexVolume.SecretRef.Name) {
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return false
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}
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case source.Projected != nil:
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for j := range source.Projected.Sources {
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if source.Projected.Sources[j].Secret != nil {
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if !visitor(source.Projected.Sources[j].Secret.Name) {
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return false
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}
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}
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}
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case source.RBD != nil:
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if source.RBD.SecretRef != nil && !visitor(source.RBD.SecretRef.Name) {
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return false
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}
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case source.Secret != nil:
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if !visitor(source.Secret.SecretName) {
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return false
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}
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case source.ScaleIO != nil:
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if source.ScaleIO.SecretRef != nil && !visitor(source.ScaleIO.SecretRef.Name) {
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return false
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}
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case source.ISCSI != nil:
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if source.ISCSI.SecretRef != nil && !visitor(source.ISCSI.SecretRef.Name) {
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return false
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}
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case source.StorageOS != nil:
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if source.StorageOS.SecretRef != nil && !visitor(source.StorageOS.SecretRef.Name) {
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return false
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}
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}
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}
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return true
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}
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func visitContainerSecretNames(container *v1.Container, visitor Visitor) bool {
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for _, env := range container.EnvFrom {
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if env.SecretRef != nil {
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if !visitor(env.SecretRef.Name) {
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return false
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}
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}
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}
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for _, envVar := range container.Env {
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if envVar.ValueFrom != nil && envVar.ValueFrom.SecretKeyRef != nil {
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if !visitor(envVar.ValueFrom.SecretKeyRef.Name) {
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return false
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}
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}
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}
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return true
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}
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// VisitPodConfigmapNames invokes the visitor function with the name of every configmap
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// referenced by the pod spec. If visitor returns false, visiting is short-circuited.
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// Transitive references (e.g. pod -> pvc -> pv -> secret) are not visited.
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// Returns true if visiting completed, false if visiting was short-circuited.
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func VisitPodConfigmapNames(pod *v1.Pod, visitor Visitor) bool {
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for i := range pod.Spec.InitContainers {
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if !visitContainerConfigmapNames(&pod.Spec.InitContainers[i], visitor) {
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return false
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}
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}
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for i := range pod.Spec.Containers {
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if !visitContainerConfigmapNames(&pod.Spec.Containers[i], visitor) {
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return false
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}
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}
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var source *v1.VolumeSource
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for i := range pod.Spec.Volumes {
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source = &pod.Spec.Volumes[i].VolumeSource
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switch {
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case source.Projected != nil:
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for j := range source.Projected.Sources {
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if source.Projected.Sources[j].ConfigMap != nil {
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if !visitor(source.Projected.Sources[j].ConfigMap.Name) {
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return false
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}
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}
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}
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case source.ConfigMap != nil:
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if !visitor(source.ConfigMap.Name) {
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return false
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}
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}
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}
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return true
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}
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func visitContainerConfigmapNames(container *v1.Container, visitor Visitor) bool {
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for _, env := range container.EnvFrom {
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if env.ConfigMapRef != nil {
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if !visitor(env.ConfigMapRef.Name) {
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return false
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}
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}
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}
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for _, envVar := range container.Env {
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if envVar.ValueFrom != nil && envVar.ValueFrom.ConfigMapKeyRef != nil {
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if !visitor(envVar.ValueFrom.ConfigMapKeyRef.Name) {
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return false
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}
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}
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}
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return true
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}
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// GetContainerStatus extracts the status of container "name" from "statuses".
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// It also returns if "name" exists.
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func GetContainerStatus(statuses []v1.ContainerStatus, name string) (v1.ContainerStatus, bool) {
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for i := range statuses {
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if statuses[i].Name == name {
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return statuses[i], true
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}
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}
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return v1.ContainerStatus{}, false
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}
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// GetExistingContainerStatus extracts the status of container "name" from "statuses",
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// and returns empty status if "name" does not exist.
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func GetExistingContainerStatus(statuses []v1.ContainerStatus, name string) v1.ContainerStatus {
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for i := range statuses {
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if statuses[i].Name == name {
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return statuses[i]
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}
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}
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return v1.ContainerStatus{}
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}
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// IsPodAvailable returns true if a pod is available; false otherwise.
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// Precondition for an available pod is that it must be ready. On top
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// of that, there are two cases when a pod can be considered available:
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// 1. minReadySeconds == 0, or
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// 2. LastTransitionTime (is set) + minReadySeconds < current time
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func IsPodAvailable(pod *v1.Pod, minReadySeconds int32, now metav1.Time) bool {
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if !IsPodReady(pod) {
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return false
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}
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c := GetPodReadyCondition(pod.Status)
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minReadySecondsDuration := time.Duration(minReadySeconds) * time.Second
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if minReadySeconds == 0 || !c.LastTransitionTime.IsZero() && c.LastTransitionTime.Add(minReadySecondsDuration).Before(now.Time) {
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return true
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}
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return false
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}
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// IsPodReady returns true if a pod is ready; false otherwise.
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func IsPodReady(pod *v1.Pod) bool {
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return IsPodReadyConditionTrue(pod.Status)
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}
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// IsPodReady retruns true if a pod is ready; false otherwise.
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func IsPodReadyConditionTrue(status v1.PodStatus) bool {
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condition := GetPodReadyCondition(status)
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return condition != nil && condition.Status == v1.ConditionTrue
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}
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// Extracts the pod ready condition from the given status and returns that.
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// Returns nil if the condition is not present.
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func GetPodReadyCondition(status v1.PodStatus) *v1.PodCondition {
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_, condition := GetPodCondition(&status, v1.PodReady)
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return condition
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}
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// GetPodCondition extracts the provided condition from the given status and returns that.
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// Returns nil and -1 if the condition is not present, and the index of the located condition.
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func GetPodCondition(status *v1.PodStatus, conditionType v1.PodConditionType) (int, *v1.PodCondition) {
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if status == nil {
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return -1, nil
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}
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for i := range status.Conditions {
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if status.Conditions[i].Type == conditionType {
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return i, &status.Conditions[i]
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}
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}
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return -1, nil
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}
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// Updates existing pod condition or creates a new one. Sets LastTransitionTime to now if the
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// status has changed.
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// Returns true if pod condition has changed or has been added.
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func UpdatePodCondition(status *v1.PodStatus, condition *v1.PodCondition) bool {
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condition.LastTransitionTime = metav1.Now()
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// Try to find this pod condition.
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conditionIndex, oldCondition := GetPodCondition(status, condition.Type)
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if oldCondition == nil {
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// We are adding new pod condition.
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status.Conditions = append(status.Conditions, *condition)
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return true
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} else {
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// We are updating an existing condition, so we need to check if it has changed.
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if condition.Status == oldCondition.Status {
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condition.LastTransitionTime = oldCondition.LastTransitionTime
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}
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isEqual := condition.Status == oldCondition.Status &&
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condition.Reason == oldCondition.Reason &&
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condition.Message == oldCondition.Message &&
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condition.LastProbeTime.Equal(&oldCondition.LastProbeTime) &&
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condition.LastTransitionTime.Equal(&oldCondition.LastTransitionTime)
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status.Conditions[conditionIndex] = *condition
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// Return true if one of the fields have changed.
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return !isEqual
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}
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}
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