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Merge pull request etcd-io#16072 from serathius/robustness-stale-read
Validate stale read
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| // Copyright 2023 The etcd 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 model | ||
|
|
||
| import ( | ||
| "fmt" | ||
| ) | ||
|
|
||
| func NewReplay(eventHistory []WatchEvent) *EtcdReplay { | ||
| var lastEventRevision int64 = 1 | ||
| for _, event := range eventHistory { | ||
| if event.Revision > lastEventRevision && event.Revision != lastEventRevision+1 { | ||
| panic("Replay requires a complete event history") | ||
| } | ||
| lastEventRevision = event.Revision | ||
| } | ||
| return &EtcdReplay{ | ||
| eventHistory: eventHistory, | ||
| } | ||
| } | ||
|
|
||
| type EtcdReplay struct { | ||
| eventHistory []WatchEvent | ||
|
|
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| // Cached state and event index used for it's calculation | ||
| cachedState *EtcdState | ||
| eventHistoryIndex int | ||
| } | ||
|
|
||
| func (r *EtcdReplay) StateForRevision(revision int64) (EtcdState, error) { | ||
| if revision < 1 { | ||
| return EtcdState{}, fmt.Errorf("invalid revision: %d", revision) | ||
| } | ||
| if r.cachedState == nil || r.cachedState.Revision > revision { | ||
| r.reset() | ||
| } | ||
|
|
||
| for r.eventHistoryIndex < len(r.eventHistory) && r.cachedState.Revision < revision { | ||
| nextRequest, nextRevision, nextIndex := r.next() | ||
| newState, _ := r.cachedState.Step(nextRequest) | ||
| if newState.Revision != nextRevision { | ||
| return EtcdState{}, fmt.Errorf("model returned different revision than one present in event history, model: %d, event: %d", newState.Revision, nextRevision) | ||
| } | ||
| r.cachedState = &newState | ||
| r.eventHistoryIndex = nextIndex | ||
| } | ||
| if r.eventHistoryIndex > len(r.eventHistory) && r.cachedState.Revision < revision { | ||
| return EtcdState{}, fmt.Errorf("requested revision higher then available in even history, requested: %d, model: %d", revision, r.cachedState.Revision) | ||
| } | ||
| return *r.cachedState, nil | ||
| } | ||
|
|
||
| func (r *EtcdReplay) reset() { | ||
| state := freshEtcdState() | ||
| r.cachedState = &state | ||
| r.eventHistoryIndex = 0 | ||
| } | ||
|
|
||
| func (r *EtcdReplay) next() (request EtcdRequest, revision int64, index int) { | ||
| revision = r.eventHistory[r.eventHistoryIndex].Revision | ||
| index = r.eventHistoryIndex | ||
| operations := []EtcdOperation{} | ||
| for r.eventHistory[index].Revision == revision { | ||
| operations = append(operations, r.eventHistory[index].Op) | ||
| index++ | ||
| } | ||
| return EtcdRequest{ | ||
| Type: Txn, | ||
| Txn: &TxnRequest{ | ||
| OperationsOnSuccess: operations, | ||
| }, | ||
| }, revision, index | ||
| } | ||
|
|
||
| func operationToRequest(op EtcdOperation) EtcdRequest { | ||
| return EtcdRequest{ | ||
| Type: Txn, | ||
| Txn: &TxnRequest{ | ||
| OperationsOnSuccess: []EtcdOperation{op}, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| type WatchEvent struct { | ||
| Op EtcdOperation | ||
| Revision int64 | ||
| } |
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