VM: Diff-based Touched Accounts Checkpointing #2581
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| export class Journaling<T> { | ||
| public journal: Set<T> | ||
| protected journalStack: { [key: number]: Set<T> } | ||
| protected journalHeight: Map<T, number> | ||
| protected height: number | ||
|
|
||
| constructor() { | ||
| this.journal = new Set() | ||
| this.journalStack = {} | ||
| this.journalHeight = new Map() | ||
| this.height = 0 | ||
| } | ||
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| clear() { | ||
| this.journal.clear() | ||
| this.journalStack = {} | ||
| this.journalHeight = new Map() | ||
| this.height = 0 | ||
| } | ||
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| checkpoint() { | ||
| this.height++ | ||
| } | ||
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| revert(ignoreItem?: T) { | ||
| const height = this.height | ||
| if (height in this.journalStack) { | ||
| for (const key of this.journalStack[height]) { | ||
| // Exceptional case due to consensus issue in Geth and Parity. | ||
| // See [EIP issue #716](https://github.com/ethereum/EIPs/issues/716) for context. | ||
| // The RIPEMD precompile has to remain *touched* even when the call reverts, | ||
| // and be considered for deletion. | ||
| if (key === ignoreItem) { | ||
| continue | ||
| } | ||
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||
| if (this.journal.has(key) && this.journalHeight.get(key)! >= height) { | ||
| this.journal.delete(key) | ||
| this.journalHeight.delete(key) | ||
| } | ||
| } | ||
| delete this.journalStack[height] | ||
| } | ||
| this.height-- | ||
| } | ||
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| commit() { | ||
| const height = this.height | ||
| if (height in this.journalStack) { | ||
| // Copy the items-to-delete in case of a revert into one level higher | ||
| if (height > 0) { | ||
| if (this.journalStack[height - 1] === undefined) { | ||
| this.journalStack[height - 1] = new Set() | ||
| } | ||
| for (const address of this.journalStack[height]) { | ||
| this.journalStack[height - 1].add(address) | ||
| if (this.journalHeight.get(address) === height) { | ||
| this.journalHeight.set(address, height - 1) | ||
| } | ||
| } | ||
| } else { | ||
| this.journal = new Set() | ||
| this.journalHeight = new Map() | ||
| } | ||
| delete this.journalStack[height] | ||
| } | ||
| this.height-- | ||
| } | ||
|
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| addJournalItem(input: T) { | ||
| const height = this.height | ||
| if (!(height in this.journalStack)) { | ||
| this.journalStack[height] = new Set() | ||
| } | ||
| this.journalStack[height].add(input) | ||
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| this.journal.add(input) | ||
| if (this.journalHeight.get(input) === undefined) { | ||
| this.journalHeight.set(input, height) | ||
| } | ||
| } | ||
| } | ||
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Oh, this looks super-clean. Great stuff! 🙂 👍