273 lines
10 KiB
Go
273 lines
10 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 unversioned
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import (
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"fmt"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/apis/apps"
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"k8s.io/kubernetes/pkg/apis/batch"
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"k8s.io/kubernetes/pkg/apis/extensions"
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appsclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/apps/internalversion"
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batchclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/batch/internalversion"
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coreclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/internalversion"
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extensionsclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/extensions/internalversion"
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)
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// ControllerHasDesiredReplicas returns a condition that will be true if and only if
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// the desired replica count for a controller's ReplicaSelector equals the Replicas count.
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func ControllerHasDesiredReplicas(rcClient coreclient.ReplicationControllersGetter, controller *api.ReplicationController) wait.ConditionFunc {
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// If we're given a controller where the status lags the spec, it either means that the controller is stale,
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// or that the rc manager hasn't noticed the update yet. Polling status.Replicas is not safe in the latter case.
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desiredGeneration := controller.Generation
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return func() (bool, error) {
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ctrl, err := rcClient.ReplicationControllers(controller.Namespace).Get(controller.Name, metav1.GetOptions{})
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if err != nil {
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return false, err
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}
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// There's a chance a concurrent update modifies the Spec.Replicas causing this check to pass,
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// or, after this check has passed, a modification causes the rc manager to create more pods.
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// This will not be an issue once we've implemented graceful delete for rcs, but till then
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// concurrent stop operations on the same rc might have unintended side effects.
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return ctrl.Status.ObservedGeneration >= desiredGeneration && ctrl.Status.Replicas == ctrl.Spec.Replicas, nil
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}
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}
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// ReplicaSetHasDesiredReplicas returns a condition that will be true if and only if
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// the desired replica count for a ReplicaSet's ReplicaSelector equals the Replicas count.
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func ReplicaSetHasDesiredReplicas(rsClient extensionsclient.ReplicaSetsGetter, replicaSet *extensions.ReplicaSet) wait.ConditionFunc {
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// If we're given a ReplicaSet where the status lags the spec, it either means that the
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// ReplicaSet is stale, or that the ReplicaSet manager hasn't noticed the update yet.
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// Polling status.Replicas is not safe in the latter case.
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desiredGeneration := replicaSet.Generation
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return func() (bool, error) {
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rs, err := rsClient.ReplicaSets(replicaSet.Namespace).Get(replicaSet.Name, metav1.GetOptions{})
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if err != nil {
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return false, err
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}
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// There's a chance a concurrent update modifies the Spec.Replicas causing this check to
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// pass, or, after this check has passed, a modification causes the ReplicaSet manager to
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// create more pods. This will not be an issue once we've implemented graceful delete for
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// ReplicaSets, but till then concurrent stop operations on the same ReplicaSet might have
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// unintended side effects.
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return rs.Status.ObservedGeneration >= desiredGeneration && rs.Status.Replicas == rs.Spec.Replicas, nil
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}
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}
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// StatefulSetHasDesiredPets returns a conditon that checks the number of petset replicas
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func StatefulSetHasDesiredPets(psClient appsclient.StatefulSetsGetter, petset *apps.StatefulSet) wait.ConditionFunc {
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// TODO: Differentiate between 0 pets and a really quick scale down using generation.
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return func() (bool, error) {
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ps, err := psClient.StatefulSets(petset.Namespace).Get(petset.Name, metav1.GetOptions{})
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if err != nil {
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return false, err
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}
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return ps.Status.Replicas == ps.Spec.Replicas, nil
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}
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}
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// JobHasDesiredParallelism returns a condition that will be true if the desired parallelism count
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// for a job equals the current active counts or is less by an appropriate successful/unsuccessful count.
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func JobHasDesiredParallelism(jobClient batchclient.JobsGetter, job *batch.Job) wait.ConditionFunc {
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return func() (bool, error) {
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job, err := jobClient.Jobs(job.Namespace).Get(job.Name, metav1.GetOptions{})
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if err != nil {
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return false, err
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}
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// desired parallelism can be either the exact number, in which case return immediately
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if job.Status.Active == *job.Spec.Parallelism {
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return true, nil
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}
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if job.Spec.Completions == nil {
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// A job without specified completions needs to wait for Active to reach Parallelism.
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return false, nil
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}
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// otherwise count successful
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progress := *job.Spec.Completions - job.Status.Active - job.Status.Succeeded
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return progress == 0, nil
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}
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}
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// DeploymentHasDesiredReplicas returns a condition that will be true if and only if
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// the desired replica count for a deployment equals its updated replicas count.
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// (non-terminated pods that have the desired template spec).
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func DeploymentHasDesiredReplicas(dClient extensionsclient.DeploymentsGetter, deployment *extensions.Deployment) wait.ConditionFunc {
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// If we're given a deployment where the status lags the spec, it either
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// means that the deployment is stale, or that the deployment manager hasn't
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// noticed the update yet. Polling status.Replicas is not safe in the latter
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// case.
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desiredGeneration := deployment.Generation
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return func() (bool, error) {
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deployment, err := dClient.Deployments(deployment.Namespace).Get(deployment.Name, metav1.GetOptions{})
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if err != nil {
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return false, err
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}
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return deployment.Status.ObservedGeneration >= desiredGeneration &&
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deployment.Status.UpdatedReplicas == deployment.Spec.Replicas, nil
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}
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}
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// ErrPodCompleted is returned by PodRunning or PodContainerRunning to indicate that
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// the pod has already reached completed state.
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var ErrPodCompleted = fmt.Errorf("pod ran to completion")
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// ErrContainerTerminated is returned by PodContainerRunning in the intermediate
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// state where the pod indicates it's still running, but its container is already terminated
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var ErrContainerTerminated = fmt.Errorf("container terminated")
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// PodRunning returns true if the pod is running, false if the pod has not yet reached running state,
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// returns ErrPodCompleted if the pod has run to completion, or an error in any other case.
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func PodRunning(event watch.Event) (bool, error) {
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switch event.Type {
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case watch.Deleted:
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return false, errors.NewNotFound(schema.GroupResource{Resource: "pods"}, "")
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}
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switch t := event.Object.(type) {
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case *api.Pod:
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switch t.Status.Phase {
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case api.PodRunning:
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return true, nil
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case api.PodFailed, api.PodSucceeded:
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return false, ErrPodCompleted
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}
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}
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return false, nil
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}
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// PodCompleted returns true if the pod has run to completion, false if the pod has not yet
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// reached running state, or an error in any other case.
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func PodCompleted(event watch.Event) (bool, error) {
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switch event.Type {
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case watch.Deleted:
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return false, errors.NewNotFound(schema.GroupResource{Resource: "pods"}, "")
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}
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switch t := event.Object.(type) {
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case *api.Pod:
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switch t.Status.Phase {
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case api.PodFailed, api.PodSucceeded:
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return true, nil
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}
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}
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return false, nil
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}
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// PodRunningAndReady returns true if the pod is running and ready, false if the pod has not
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// yet reached those states, returns ErrPodCompleted if the pod has run to completion, or
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// an error in any other case.
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func PodRunningAndReady(event watch.Event) (bool, error) {
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switch event.Type {
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case watch.Deleted:
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return false, errors.NewNotFound(schema.GroupResource{Resource: "pods"}, "")
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}
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switch t := event.Object.(type) {
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case *api.Pod:
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switch t.Status.Phase {
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case api.PodFailed, api.PodSucceeded:
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return false, ErrPodCompleted
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case api.PodRunning:
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return api.IsPodReady(t), nil
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}
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}
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return false, nil
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}
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// PodNotPending returns true if the pod has left the pending state, false if it has not,
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// or an error in any other case (such as if the pod was deleted).
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func PodNotPending(event watch.Event) (bool, error) {
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switch event.Type {
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case watch.Deleted:
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return false, errors.NewNotFound(schema.GroupResource{Resource: "pods"}, "")
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}
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switch t := event.Object.(type) {
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case *api.Pod:
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switch t.Status.Phase {
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case api.PodPending:
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return false, nil
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default:
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return true, nil
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}
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}
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return false, nil
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}
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// PodContainerRunning returns false until the named container has ContainerStatus running (at least once),
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// and will return an error if the pod is deleted, runs to completion, or the container pod is not available.
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func PodContainerRunning(containerName string) watch.ConditionFunc {
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return func(event watch.Event) (bool, error) {
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switch event.Type {
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case watch.Deleted:
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return false, errors.NewNotFound(schema.GroupResource{Resource: "pods"}, "")
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}
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switch t := event.Object.(type) {
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case *api.Pod:
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switch t.Status.Phase {
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case api.PodRunning, api.PodPending:
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case api.PodFailed, api.PodSucceeded:
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return false, ErrPodCompleted
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default:
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return false, nil
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}
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for _, s := range t.Status.ContainerStatuses {
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if s.Name != containerName {
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continue
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}
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if s.State.Terminated != nil {
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return false, ErrContainerTerminated
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}
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return s.State.Running != nil, nil
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}
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for _, s := range t.Status.InitContainerStatuses {
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if s.Name != containerName {
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continue
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}
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if s.State.Terminated != nil {
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return false, ErrContainerTerminated
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}
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return s.State.Running != nil, nil
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}
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return false, nil
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}
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return false, nil
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}
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}
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// ServiceAccountHasSecrets returns true if the service account has at least one secret,
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// false if it does not, or an error.
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func ServiceAccountHasSecrets(event watch.Event) (bool, error) {
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switch event.Type {
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case watch.Deleted:
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return false, errors.NewNotFound(schema.GroupResource{Resource: "serviceaccounts"}, "")
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}
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switch t := event.Object.(type) {
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case *api.ServiceAccount:
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return len(t.Secrets) > 0, nil
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}
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return false, nil
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}
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