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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| Copyright 2024 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 leaderelection | ||
|
|
||
| import ( | ||
| "slices" | ||
| "time" | ||
|
|
||
| "github.com/blang/semver/v4" | ||
| v1 "k8s.io/api/coordination/v1" | ||
| v1alpha1 "k8s.io/api/coordination/v1alpha1" | ||
| "k8s.io/klog/v2" | ||
| ) | ||
|
|
||
| func pickBestLeaderOldestEmulationVersion(candidates []*v1alpha1.LeaseCandidate) *v1alpha1.LeaseCandidate { | ||
| var electee *v1alpha1.LeaseCandidate | ||
| for _, c := range candidates { | ||
| if !validLeaseCandidateForOldestEmulationVersion(c) { | ||
| continue | ||
| } | ||
| if electee == nil || compare(electee, c) > 0 { | ||
| electee = c | ||
| } | ||
| } | ||
| if electee == nil { | ||
| klog.Infof("pickBestLeader: none found") | ||
| } else { | ||
| klog.Infof("pickBestLeader: %s %s", electee.Namespace, electee.Name) | ||
| } | ||
| return electee | ||
| } | ||
|
|
||
| func shouldReelect(candidates []*v1alpha1.LeaseCandidate, currentLeader *v1alpha1.LeaseCandidate) bool { | ||
| klog.Infof("shouldReelect for candidates: %+v", candidates) | ||
| pickedLeader := pickBestLeaderOldestEmulationVersion(candidates) | ||
| if pickedLeader == nil { | ||
| return false | ||
| } | ||
| return compare(currentLeader, pickedLeader) > 0 | ||
| } | ||
|
|
||
| func pickBestStrategy(candidates []*v1alpha1.LeaseCandidate) v1.CoordinatedLeaseStrategy { | ||
| // TODO: This doesn't account for cycles within the preference graph | ||
| // We may have to do a topological sort to verify that the preference ordering is valid | ||
| var bestStrategy *v1.CoordinatedLeaseStrategy | ||
| for _, c := range candidates { | ||
| if len(c.Spec.PreferredStrategies) > 0 { | ||
| if bestStrategy == nil { | ||
| bestStrategy = &c.Spec.PreferredStrategies[0] | ||
| continue | ||
| } | ||
| if *bestStrategy != c.Spec.PreferredStrategies[0] { | ||
| if idx := slices.Index(c.Spec.PreferredStrategies, *bestStrategy); idx > 0 { | ||
| bestStrategy = &c.Spec.PreferredStrategies[0] | ||
| } else { | ||
| klog.Infof("Error: bad strategy ordering") | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return (*bestStrategy) | ||
| } | ||
|
|
||
| func validLeaseCandidateForOldestEmulationVersion(l *v1alpha1.LeaseCandidate) bool { | ||
| _, err := semver.ParseTolerant(l.Spec.EmulationVersion) | ||
| if err != nil { | ||
| return false | ||
| } | ||
| _, err = semver.ParseTolerant(l.Spec.BinaryVersion) | ||
| return err == nil | ||
| } | ||
|
|
||
| func getEmulationVersion(l *v1alpha1.LeaseCandidate) semver.Version { | ||
| value := l.Spec.EmulationVersion | ||
| v, err := semver.ParseTolerant(value) | ||
| if err != nil { | ||
| return semver.Version{} | ||
| } | ||
| return v | ||
| } | ||
|
|
||
| func getBinaryVersion(l *v1alpha1.LeaseCandidate) semver.Version { | ||
| value := l.Spec.BinaryVersion | ||
| v, err := semver.ParseTolerant(value) | ||
| if err != nil { | ||
| return semver.Version{} | ||
| } | ||
| return v | ||
| } | ||
|
|
||
| // -1: lhs better, 1: rhs better | ||
| func compare(lhs, rhs *v1alpha1.LeaseCandidate) int { | ||
| lhsVersion := getEmulationVersion(lhs) | ||
| rhsVersion := getEmulationVersion(rhs) | ||
| result := lhsVersion.Compare(rhsVersion) | ||
| if result == 0 { | ||
| lhsVersion := getBinaryVersion(lhs) | ||
| rhsVersion := getBinaryVersion(rhs) | ||
| result = lhsVersion.Compare(rhsVersion) | ||
| } | ||
| if result == 0 { | ||
| if lhs.CreationTimestamp.After(rhs.CreationTimestamp.Time) { | ||
| return 1 | ||
| } | ||
| return -1 | ||
| } | ||
| return result | ||
| } | ||
|
|
||
| func isLeaseExpired(lease *v1.Lease) bool { | ||
| currentTime := time.Now() | ||
| return lease.Spec.RenewTime == nil || | ||
| lease.Spec.LeaseDurationSeconds == nil || | ||
| lease.Spec.RenewTime.Add(time.Duration(*lease.Spec.LeaseDurationSeconds)*time.Second).Before(currentTime) | ||
| } | ||
|
|
||
| func isLeaseCandidateExpired(lease *v1alpha1.LeaseCandidate) bool { | ||
| currentTime := time.Now() | ||
| return lease.Spec.RenewTime == nil || | ||
| lease.Spec.RenewTime.Add(leaseCandidateValidDuration).Before(currentTime) | ||
| } |
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