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pod.go
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pod.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-2019 Datadog, Inc.
package pod
import (
"fmt"
"sort"
"time"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
datadoghqv1alpha1 "github.com/DataDog/extendeddaemonset/api/v1alpha1"
"github.com/DataDog/extendeddaemonset/pkg/controller/utils/affinity"
)
// GetContainerStatus extracts the status of container "name" from "statuses".
// It also returns if "name" exists.
func GetContainerStatus(statuses []v1.ContainerStatus, name string) (v1.ContainerStatus, bool) {
for i := range statuses {
if statuses[i].Name == name {
return statuses[i], true
}
}
return v1.ContainerStatus{}, false
}
// GetExistingContainerStatus extracts the status of container "name" from "statuses".
func GetExistingContainerStatus(statuses []v1.ContainerStatus, name string) v1.ContainerStatus {
status, _ := GetContainerStatus(statuses, name)
return status
}
// IsPodScheduled return true if it is already assigned to a Node.
func IsPodScheduled(pod *v1.Pod) (string, bool) {
isScheduled := pod.Spec.NodeName != ""
nodeName := affinity.GetNodeNameFromAffinity(pod.Spec.Affinity)
return nodeName, isScheduled
}
// IsPodAvailable returns true if a pod is available; false otherwise.
// Precondition for an available pod is that it must be ready. On top
// of that, there are two cases when a pod can be considered available:
// 1. minReadySeconds == 0, or
// 2. LastTransitionTime (is set) + minReadySeconds < current time
func IsPodAvailable(pod *v1.Pod, minReadySeconds int32, now metav1.Time) bool {
if !IsPodReady(pod) {
return false
}
c := GetPodReadyCondition(pod.Status)
minReadySecondsDuration := time.Duration(minReadySeconds) * time.Second
if minReadySeconds == 0 || !c.LastTransitionTime.IsZero() && c.LastTransitionTime.Add(minReadySecondsDuration).Before(now.Time) {
return true
}
return false
}
// GetNodeNameFromPod returns the NodeName from Pod spec. either from `pod.Spec.NodeName`
// if the pod is already scheduled, of from the NodeAffinity.
func GetNodeNameFromPod(pod *v1.Pod) (string, error) {
if pod.Spec.NodeName != "" {
return pod.Spec.NodeName, nil
}
nodeName := affinity.GetNodeNameFromAffinity(pod.Spec.Affinity)
if nodeName == "" {
return "", fmt.Errorf("unable to retrieve nodeName for the pod: %s/%s", pod.Namespace, pod.Name)
}
return nodeName, nil
}
// IsPodReady returns true if a pod is ready; false otherwise.
func IsPodReady(pod *v1.Pod) bool {
return IsPodReadyConditionTrue(pod.Status)
}
// IsPodReadyConditionTrue returns true if a pod is ready; false otherwise.
func IsPodReadyConditionTrue(status v1.PodStatus) bool {
condition := GetPodReadyCondition(status)
return condition != nil && condition.Status == v1.ConditionTrue
}
// GetPodReadyCondition extracts the pod ready condition from the given status and returns that.
// Returns nil if the condition is not present.
func GetPodReadyCondition(status v1.PodStatus) *v1.PodCondition {
_, condition := GetPodCondition(&status, v1.PodReady)
return condition
}
// GetPodCondition extracts the provided condition from the given status and returns that.
// Returns nil and -1 if the condition is not present, and the index of the located condition.
func GetPodCondition(status *v1.PodStatus, conditionType v1.PodConditionType) (int, *v1.PodCondition) {
if status == nil {
return -1, nil
}
return GetPodConditionFromList(status.Conditions, conditionType)
}
// GetPodConditionFromList extracts the provided condition from the given list of condition and
// returns the index of the condition and the condition. Returns -1 and nil if the condition is not present.
func GetPodConditionFromList(conditions []v1.PodCondition, conditionType v1.PodConditionType) (int, *v1.PodCondition) {
if conditions == nil {
return -1, nil
}
for i := range conditions {
if conditions[i].Type == conditionType {
return i, &conditions[i]
}
}
return -1, nil
}
func containerStatusList(pod *v1.Pod) []v1.ContainerStatus {
containersStatus := append(pod.Status.ContainerStatuses, pod.Status.InitContainerStatuses...)
return append(containersStatus, pod.Status.EphemeralContainerStatuses...)
}
// HighestRestartCount checks if a pod in the Canary deployment is restarting
// This returns the count and the "reason" for the pod with the most restarts.
func HighestRestartCount(pod *v1.Pod) (int, datadoghqv1alpha1.ExtendedDaemonSetStatusReason) {
// track the highest number of restarts among pod containers
var (
restartCount int32
reason datadoghqv1alpha1.ExtendedDaemonSetStatusReason
)
for _, s := range containerStatusList(pod) {
if s.RestartCount > restartCount {
restartCount = s.RestartCount
reason = datadoghqv1alpha1.ExtendedDaemonSetStatusReasonUnknown
if s.LastTerminationState != (v1.ContainerState{}) && *s.LastTerminationState.Terminated != (v1.ContainerStateTerminated{}) {
if s.LastTerminationState.Terminated.Reason != "" { // The Reason field is optional and can be empty
reason = datadoghqv1alpha1.ExtendedDaemonSetStatusReason(s.LastTerminationState.Terminated.Reason)
}
}
}
}
return int(restartCount), reason
}
// MostRecentRestart returns the most recent restart time for a pod or the time.
func MostRecentRestart(pod *v1.Pod) (time.Time, datadoghqv1alpha1.ExtendedDaemonSetStatusReason) {
var (
restartTime time.Time
reason datadoghqv1alpha1.ExtendedDaemonSetStatusReason
)
for _, s := range containerStatusList(pod) {
if s.RestartCount != 0 && s.LastTerminationState != (v1.ContainerState{}) && s.LastTerminationState.Terminated != (&v1.ContainerStateTerminated{}) {
if s.LastTerminationState.Terminated.FinishedAt.After(restartTime) {
restartTime = s.LastTerminationState.Terminated.FinishedAt.Time
reason = datadoghqv1alpha1.ExtendedDaemonSetStatusReasonUnknown
if s.LastTerminationState.Terminated.Reason != "" { // The Reason field is optional and can be empty
reason = datadoghqv1alpha1.ExtendedDaemonSetStatusReason(s.LastTerminationState.Terminated.Reason)
}
}
}
}
return restartTime, reason
}
var cannotStartReasons = map[string]struct{}{
"ErrImagePull": {},
"ImagePullBackOff": {},
"ImageInspectError": {},
"ErrImageNeverPull": {},
"RegistryUnavailable": {},
"InvalidImageName": {},
"CreateContainerConfigError": {},
"CreateContainerError": {},
"PreStartHookError": {},
"PostStartHookError": {},
"PreCreateHookError": {},
}
// IsCannotStartReason returns true for a reason that is considered an abnormal cannot start condition.
func IsCannotStartReason(reason string) bool {
_, found := cannotStartReasons[reason]
return found
}
// CannotStart returns true if the Pod is currently experiencing abnormal start condition.
func CannotStart(pod *v1.Pod) (bool, datadoghqv1alpha1.ExtendedDaemonSetStatusReason) {
for _, s := range containerStatusList(pod) {
if s.State.Waiting != nil && IsCannotStartReason(s.State.Waiting.Reason) {
return true, convertReasonToEDSStatusReason(s.State.Waiting.Reason)
}
}
return false, datadoghqv1alpha1.ExtendedDaemonSetStatusReasonUnknown
}
func convertReasonToEDSStatusReason(reason string) datadoghqv1alpha1.ExtendedDaemonSetStatusReason {
t := datadoghqv1alpha1.ExtendedDaemonSetStatusReason(reason)
switch t {
case datadoghqv1alpha1.ExtendedDaemonSetStatusReasonCLB,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonOOM,
datadoghqv1alpha1.ExtendedDaemonSetStatusRestartsTimeoutExceeded,
datadoghqv1alpha1.ExtendedDaemonSetStatusSlowStartTimeoutExceeded,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonErrImagePull,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonImagePullBackOff,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonImageInspectError,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonErrImageNeverPull,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonRegistryUnavailable,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonInvalidImageName,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonCreateContainerConfigError,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonCreateContainerError,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonPreStartHookError,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonPostStartHookError,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonPreCreateHookError,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonStartError,
datadoghqv1alpha1.ExtendedDaemonSetStatusReasonUnknown:
return t
default:
return datadoghqv1alpha1.ExtendedDaemonSetStatusReasonUnknown
}
}
// PendingCreate returns true if the Pod is pending create (may be an eventually resolving state).
func PendingCreate(pod *v1.Pod) bool {
for _, s := range containerStatusList(pod) {
if s.State.Waiting != nil && s.State.Waiting.Reason == "ContainerCreating" {
return true
}
}
return false
}
// HasPodSchedulerIssue returns true if a pod remained unscheduled for more than 10 minutes
// or if it stayed in `Terminating` state for longer than its grace period.
func HasPodSchedulerIssue(pod *v1.Pod) bool {
_, isScheduled := IsPodScheduled(pod)
if !isScheduled && pod.CreationTimestamp.Add(10*time.Minute).Before(time.Now()) {
return true
}
if pod.DeletionTimestamp != nil && pod.DeletionGracePeriodSeconds != nil &&
pod.DeletionTimestamp.Add(time.Duration(*pod.DeletionGracePeriodSeconds)*time.Second).Before(time.Now()) {
return true
}
return false
}
// UpdatePodCondition updates existing pod condition or creates a new one. Sets LastTransitionTime to now if the
// status has changed.
// Returns true if pod condition has changed or has been added.
func UpdatePodCondition(status *v1.PodStatus, condition *v1.PodCondition) bool {
condition.LastTransitionTime = metav1.Now()
// Try to find this pod condition.
conditionIndex, oldCondition := GetPodCondition(status, condition.Type)
if oldCondition == nil {
// We are adding new pod condition.
status.Conditions = append(status.Conditions, *condition)
return true
}
// We are updating an existing condition, so we need to check if it has changed.
if condition.Status == oldCondition.Status {
condition.LastTransitionTime = oldCondition.LastTransitionTime
}
isEqual := condition.Status == oldCondition.Status &&
condition.Reason == oldCondition.Reason &&
condition.Message == oldCondition.Message &&
condition.LastProbeTime.Equal(&oldCondition.LastProbeTime) &&
condition.LastTransitionTime.Equal(&oldCondition.LastTransitionTime)
status.Conditions[conditionIndex] = *condition
// Return true if one of the fields have changed.
return !isEqual
}
// IsEvicted returns whether the status corresponds to an evicted pod.
func IsEvicted(status *v1.PodStatus) bool {
if status.Phase == v1.PodFailed && status.Reason == "Evicted" {
return true
}
return false
}
// SortPodByCreationTime return the pods sorted by creation time
// from the newer to the older.
func SortPodByCreationTime(pods []*v1.Pod) []*v1.Pod {
sort.Sort(podByCreationTimestamp(pods))
return pods
}
type podByCreationTimestamp []*v1.Pod
func (o podByCreationTimestamp) Len() int { return len(o) }
func (o podByCreationTimestamp) Swap(i, j int) { o[i], o[j] = o[j], o[i] }
func (o podByCreationTimestamp) Less(i, j int) bool {
if o[i].CreationTimestamp.Equal(&o[j].CreationTimestamp) {
return o[i].Name > o[j].Name
}
return o[j].CreationTimestamp.Before(&o[i].CreationTimestamp)
}