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This PR was split off from PR #165 to make it a smaller PR. There are edge cases that will be implemented in a separate PR.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| /* | ||
| Copyright 2018 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 machineset | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "time" | ||
|
|
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| "github.com/golang/glog" | ||
|
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| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/labels" | ||
|
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| "sigs.k8s.io/cluster-api/pkg/apis/cluster/v1alpha1" | ||
| machinesetclientset "sigs.k8s.io/cluster-api/pkg/client/clientset_generated/clientset/typed/cluster/v1alpha1" | ||
| ) | ||
|
|
||
| func (c *MachineSetControllerImpl) calculateStatus(ms *v1alpha1.MachineSet, filteredMachines []*v1alpha1.Machine) v1alpha1.MachineSetStatus { | ||
| newStatus := ms.Status | ||
| // Count the number of machines that have labels matching the labels of the machine | ||
| // template of the replica set, the matching machines may have more | ||
| // labels than are in the template. Because the label of machineTemplateSpec is | ||
| // a superset of the selector of the replica set, so the possible | ||
| // matching machines must be part of the filteredMachines. | ||
| fullyLabeledReplicasCount := 0 | ||
| readyReplicasCount := 0 | ||
| availableReplicasCount := 0 | ||
| templateLabel := labels.Set(ms.Spec.Template.Labels).AsSelectorPreValidated() | ||
| for _, machine := range filteredMachines { | ||
| if templateLabel.Matches(labels.Set(machine.Labels)) { | ||
| fullyLabeledReplicasCount++ | ||
| } | ||
| node, err := c.getMachineNode(machine) | ||
| if err != nil { | ||
| glog.Warningf("Unable to get node for machine %v, %v", machine.Name, err) | ||
| continue | ||
| } | ||
| if isNodeReady(node) { | ||
| readyReplicasCount++ | ||
| if isNodeAvailable(node, ms.Spec.MinReadySeconds, metav1.Now()) { | ||
| availableReplicasCount++ | ||
| } | ||
| } | ||
| } | ||
|
|
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| newStatus.Replicas = int32(len(filteredMachines)) | ||
| newStatus.FullyLabeledReplicas = int32(fullyLabeledReplicasCount) | ||
| newStatus.ReadyReplicas = int32(readyReplicasCount) | ||
| newStatus.AvailableReplicas = int32(availableReplicasCount) | ||
| return newStatus | ||
| } | ||
|
|
||
| // updateMachineSetStatus attempts to update the Status.Replicas of the given MachineSet, with a single GET/PUT retry. | ||
| func updateMachineSetStatus(c machinesetclientset.MachineSetInterface, ms *v1alpha1.MachineSet, newStatus v1alpha1.MachineSetStatus) (*v1alpha1.MachineSet, error) { | ||
| // This is the steady state. It happens when the MachineSet doesn't have any expectations, since | ||
| // we do a periodic relist every 30s. If the generations differ but the replicas are | ||
| // the same, a caller might've resized to the same replica count. | ||
| if ms.Status.Replicas == newStatus.Replicas && | ||
| ms.Status.FullyLabeledReplicas == newStatus.FullyLabeledReplicas && | ||
| ms.Status.ReadyReplicas == newStatus.ReadyReplicas && | ||
| ms.Status.AvailableReplicas == newStatus.AvailableReplicas && | ||
| ms.Generation == ms.Status.ObservedGeneration { | ||
| return ms, nil | ||
| } | ||
|
|
||
| // Save the generation number we acted on, otherwise we might wrongfully indicate | ||
| // that we've seen a spec update when we retry. | ||
| // TODO: This can clobber an update if we allow multiple agents to write to the | ||
| // same status. | ||
| newStatus.ObservedGeneration = ms.Generation | ||
|
|
||
| var getErr, updateErr error | ||
| var updatedMS *v1alpha1.MachineSet | ||
| for i := 0; ; i++ { | ||
| glog.V(4).Infof(fmt.Sprintf("Updating status for %v: %s/%s, ", ms.Kind, ms.Namespace, ms.Name) + | ||
| fmt.Sprintf("replicas %d->%d (need %d), ", ms.Status.Replicas, newStatus.Replicas, *(ms.Spec.Replicas)) + | ||
| fmt.Sprintf("fullyLabeledReplicas %d->%d, ", ms.Status.FullyLabeledReplicas, newStatus.FullyLabeledReplicas) + | ||
| fmt.Sprintf("readyReplicas %d->%d, ", ms.Status.ReadyReplicas, newStatus.ReadyReplicas) + | ||
| fmt.Sprintf("availableReplicas %d->%d, ", ms.Status.AvailableReplicas, newStatus.AvailableReplicas) + | ||
| fmt.Sprintf("sequence No: %v->%v", ms.Status.ObservedGeneration, newStatus.ObservedGeneration)) | ||
|
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| ms.Status = newStatus | ||
| updatedMS, updateErr = c.UpdateStatus(ms) | ||
| if updateErr == nil { | ||
| return updatedMS, nil | ||
| } | ||
| // Stop retrying if we exceed statusUpdateRetries - the machineSet will be requeued with a rate limit. | ||
| if i >= statusUpdateRetries { | ||
| break | ||
| } | ||
| // Update the MachineSet with the latest resource version for the next poll | ||
| if ms, getErr = c.Get(ms.Name, metav1.GetOptions{}); getErr != nil { | ||
| // If the GET fails we can't trust status.Replicas anymore. This error | ||
| // is bound to be more interesting than the update failure. | ||
| return nil, getErr | ||
| } | ||
| } | ||
|
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| return nil, updateErr | ||
| } | ||
|
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| func isNodeAvailable(node *corev1.Node, minReadySeconds int32, now metav1.Time) bool { | ||
| if !isNodeReady(node) { | ||
| return false | ||
| } | ||
|
|
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| if minReadySeconds == 0 { | ||
| return true | ||
| } | ||
|
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| minReadySecondsDuration := time.Duration(minReadySeconds) * time.Second | ||
| _, readyCondition := getNodeCondition(&node.Status, corev1.NodeReady) | ||
|
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| if !readyCondition.LastTransitionTime.IsZero() && | ||
| readyCondition.LastTransitionTime.Add(minReadySecondsDuration).Before(now.Time) { | ||
| return true | ||
| } | ||
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| return false | ||
| } | ||
|
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| // getNodeCondition 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 getNodeCondition(status *corev1.NodeStatus, conditionType corev1.NodeConditionType) (int, *corev1.NodeCondition) { | ||
| if status == nil { | ||
| return -1, nil | ||
| } | ||
| for i := range status.Conditions { | ||
| if status.Conditions[i].Type == conditionType { | ||
| return i, &status.Conditions[i] | ||
| } | ||
| } | ||
| return -1, nil | ||
| } | ||
|
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| // isNodeReady returns true if a node is ready; false otherwise. | ||
| func isNodeReady(node *corev1.Node) bool { | ||
| for _, c := range node.Status.Conditions { | ||
| if c.Type == corev1.NodeReady { | ||
| return c.Status == corev1.ConditionTrue | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
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| func getMachinesToDelete(filteredMachines []*v1alpha1.Machine, diff int) []*v1alpha1.Machine { | ||
| // TODO: Define machines deletion policies. | ||
| // see: https://github.com/kubernetes/kube-deploy/issues/625 | ||
| return filteredMachines[:diff] | ||
| } |
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