mirror of https://github.com/k3s-io/k3s
191 lines
7.1 KiB
Go
191 lines
7.1 KiB
Go
/*
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Copyright 2014 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 podutils
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import (
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"time"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/utils/integer"
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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 *corev1.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 *corev1.Pod) bool {
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return isPodReadyConditionTrue(pod.Status)
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}
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// IsPodReadyConditionTrue returns true if a pod is ready; false otherwise.
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func isPodReadyConditionTrue(status corev1.PodStatus) bool {
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condition := getPodReadyCondition(status)
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return condition != nil && condition.Status == corev1.ConditionTrue
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}
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// GetPodReadyCondition 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 corev1.PodStatus) *corev1.PodCondition {
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_, condition := getPodCondition(&status, corev1.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 *corev1.PodStatus, conditionType corev1.PodConditionType) (int, *corev1.PodCondition) {
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if status == nil {
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return -1, nil
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}
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return getPodConditionFromList(status.Conditions, conditionType)
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}
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// GetPodConditionFromList extracts the provided condition from the given list of condition and
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// returns the index of the condition and the condition. Returns -1 and nil if the condition is not present.
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func getPodConditionFromList(conditions []corev1.PodCondition, conditionType corev1.PodConditionType) (int, *corev1.PodCondition) {
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if conditions == nil {
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return -1, nil
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}
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for i := range conditions {
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if conditions[i].Type == conditionType {
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return i, &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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// ByLogging allows custom sorting of pods so the best one can be picked for getting its logs.
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type ByLogging []*corev1.Pod
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func (s ByLogging) Len() int { return len(s) }
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func (s ByLogging) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func (s ByLogging) Less(i, j int) bool {
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// 1. assigned < unassigned
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if s[i].Spec.NodeName != s[j].Spec.NodeName && (len(s[i].Spec.NodeName) == 0 || len(s[j].Spec.NodeName) == 0) {
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return len(s[i].Spec.NodeName) > 0
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}
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// 2. PodRunning < PodUnknown < PodPending
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m := map[corev1.PodPhase]int{corev1.PodRunning: 0, corev1.PodUnknown: 1, corev1.PodPending: 2}
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if m[s[i].Status.Phase] != m[s[j].Status.Phase] {
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return m[s[i].Status.Phase] < m[s[j].Status.Phase]
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}
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// 3. ready < not ready
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if IsPodReady(s[i]) != IsPodReady(s[j]) {
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return IsPodReady(s[i])
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}
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// TODO: take availability into account when we push minReadySeconds information from deployment into pods,
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// see https://github.com/kubernetes/kubernetes/issues/22065
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// 4. Been ready for more time < less time < empty time
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if IsPodReady(s[i]) && IsPodReady(s[j]) && !podReadyTime(s[i]).Equal(podReadyTime(s[j])) {
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return afterOrZero(podReadyTime(s[j]), podReadyTime(s[i]))
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}
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// 5. Pods with containers with higher restart counts < lower restart counts
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if maxContainerRestarts(s[i]) != maxContainerRestarts(s[j]) {
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return maxContainerRestarts(s[i]) > maxContainerRestarts(s[j])
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}
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// 6. older pods < newer pods < empty timestamp pods
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if !s[i].CreationTimestamp.Equal(&s[j].CreationTimestamp) {
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return afterOrZero(&s[j].CreationTimestamp, &s[i].CreationTimestamp)
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}
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return false
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}
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// ActivePods type allows custom sorting of pods so a controller can pick the best ones to delete.
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type ActivePods []*corev1.Pod
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func (s ActivePods) Len() int { return len(s) }
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func (s ActivePods) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func (s ActivePods) Less(i, j int) bool {
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// 1. Unassigned < assigned
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// If only one of the pods is unassigned, the unassigned one is smaller
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if s[i].Spec.NodeName != s[j].Spec.NodeName && (len(s[i].Spec.NodeName) == 0 || len(s[j].Spec.NodeName) == 0) {
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return len(s[i].Spec.NodeName) == 0
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}
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// 2. PodPending < PodUnknown < PodRunning
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m := map[corev1.PodPhase]int{corev1.PodPending: 0, corev1.PodUnknown: 1, corev1.PodRunning: 2}
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if m[s[i].Status.Phase] != m[s[j].Status.Phase] {
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return m[s[i].Status.Phase] < m[s[j].Status.Phase]
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}
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// 3. Not ready < ready
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// If only one of the pods is not ready, the not ready one is smaller
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if IsPodReady(s[i]) != IsPodReady(s[j]) {
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return !IsPodReady(s[i])
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}
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// TODO: take availability into account when we push minReadySeconds information from deployment into pods,
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// see https://github.com/kubernetes/kubernetes/issues/22065
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// 4. Been ready for empty time < less time < more time
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// If both pods are ready, the latest ready one is smaller
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if IsPodReady(s[i]) && IsPodReady(s[j]) && !podReadyTime(s[i]).Equal(podReadyTime(s[j])) {
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return afterOrZero(podReadyTime(s[i]), podReadyTime(s[j]))
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}
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// 5. Pods with containers with higher restart counts < lower restart counts
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if maxContainerRestarts(s[i]) != maxContainerRestarts(s[j]) {
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return maxContainerRestarts(s[i]) > maxContainerRestarts(s[j])
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}
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// 6. Empty creation time pods < newer pods < older pods
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if !s[i].CreationTimestamp.Equal(&s[j].CreationTimestamp) {
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return afterOrZero(&s[i].CreationTimestamp, &s[j].CreationTimestamp)
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}
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return false
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}
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// afterOrZero checks if time t1 is after time t2; if one of them
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// is zero, the zero time is seen as after non-zero time.
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func afterOrZero(t1, t2 *metav1.Time) bool {
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if t1.Time.IsZero() || t2.Time.IsZero() {
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return t1.Time.IsZero()
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}
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return t1.After(t2.Time)
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}
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func podReadyTime(pod *corev1.Pod) *metav1.Time {
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if IsPodReady(pod) {
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for _, c := range pod.Status.Conditions {
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// we only care about pod ready conditions
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if c.Type == corev1.PodReady && c.Status == corev1.ConditionTrue {
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return &c.LastTransitionTime
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}
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}
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}
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return &metav1.Time{}
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}
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func maxContainerRestarts(pod *corev1.Pod) int {
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maxRestarts := 0
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for _, c := range pod.Status.ContainerStatuses {
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maxRestarts = integer.IntMax(maxRestarts, int(c.RestartCount))
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}
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return maxRestarts
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}
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