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Check for resource staleness, requeue if stale
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| /* | ||
| Copyright 2021 Red Hat Inc. | ||
| 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. | ||
| */ | ||
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| package cache | ||
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| import ( | ||
| "sync" | ||
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| "k8s.io/apimachinery/pkg/types" | ||
| ) | ||
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| // Functions in this file solve the problem of duplicate reconciles when the cached | ||
| // client hasn't received the latest resource and feeds a stale resource to controller. | ||
| // We will reject reconciling a resource if its generation is older than one we've | ||
| // successfully reconciled. | ||
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| // UIDToGenerationMap keeps track of highest observed generation of a particular resource UID | ||
| type UIDToGenerationMap struct { | ||
| mutex sync.RWMutex | ||
| resourceUIDtoGeneration map[types.UID]int64 | ||
| } | ||
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| // CreateUIDToGenerationMap creates a new UID => generation map | ||
| func CreateUIDToGenerationMap() *UIDToGenerationMap { | ||
| uidGenMap := UIDToGenerationMap{} | ||
| uidGenMap.resourceUIDtoGeneration = make(map[types.UID]int64) | ||
| return &uidGenMap | ||
| } | ||
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| // getGenerationForUID returns the latest successfully reconciled resource generation | ||
| // returns -1 if not found. | ||
| func (u *UIDToGenerationMap) getGenerationForUID(resourceUID types.UID) int64 { | ||
| u.mutex.Lock() | ||
| defer u.mutex.Unlock() | ||
| generation, ok := u.resourceUIDtoGeneration[resourceUID] | ||
| if !ok { | ||
| return -1 | ||
| } | ||
| return generation | ||
| } | ||
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| // setGenerationForUID returns the latest successfully reconciled resource generation | ||
| func (u *UIDToGenerationMap) setGenerationForUID(resourceUID types.UID, generation int64) { | ||
| u.mutex.Lock() | ||
| defer u.mutex.Unlock() | ||
| u.resourceUIDtoGeneration[resourceUID] = generation | ||
| } | ||
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| // IsCacheStale checks if the cached client is providing a resource we've successfully reconciled. | ||
| func (u *UIDToGenerationMap) IsCacheStale(resourceUID types.UID, generation int64) bool { | ||
| reconciledGeneration := u.getGenerationForUID(resourceUID) | ||
| // Resource should be reconciled if we've never seen it | ||
| if generation == -1 { | ||
| return false | ||
| } | ||
| // Resource is stale if we've reconciled a newer generation | ||
| if generation < reconciledGeneration { | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
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| // RecordReconciledGeneration records that a resource UID generation was pushed back to the APIserver | ||
| func (u *UIDToGenerationMap) RecordReconciledGeneration(resourceUID types.UID, generation int64) { | ||
| u.setGenerationForUID(resourceUID, generation) | ||
| } |
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