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39 changes: 22 additions & 17 deletions
39
packages/state-transition/src/block/processExecutionLayerExit.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,50 +1,55 @@ | ||
| import {byteArrayEquals} from "@chainsafe/ssz"; | ||
| import {electra} from "@lodestar/types"; | ||
| import {CompositeViewDU} from "@chainsafe/ssz"; | ||
| import {electra, ssz} from "@lodestar/types"; | ||
| import {ETH1_ADDRESS_WITHDRAWAL_PREFIX, FAR_FUTURE_EPOCH} from "@lodestar/params"; | ||
|
|
||
| import {isActiveValidator} from "../util/index.js"; | ||
| import {CachedBeaconStateElectra} from "../types.js"; | ||
| import {initiateValidatorExit} from "./index.js"; | ||
|
|
||
| /** | ||
| * Validate execution Layer Exit, If a valid Exit is returned from isValidExecutionLayerExit Initiate the exit of the validator. | ||
| */ | ||
| export function processExecutionLayerExit(state: CachedBeaconStateElectra, exit: electra.ExecutionLayerExit): void { | ||
| if (!isValidExecutionLayerExit(state, exit)) { | ||
| const validator = isValidExecutionLayerExit(state, exit); | ||
| if (validator === null) { | ||
| return; | ||
| } | ||
|
|
||
| const {epochCtx} = state; | ||
| const validatorIndex = epochCtx.getValidatorIndex(exit.validatorPubkey); | ||
| const validator = validatorIndex !== undefined ? state.validators.get(validatorIndex) : undefined; | ||
| if (validator === undefined) { | ||
| throw Error("Internal error validator=undefined for a valid execution layer exit"); | ||
| } | ||
| initiateValidatorExit(state, validator); | ||
| } | ||
|
|
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| export function isValidExecutionLayerExit(state: CachedBeaconStateElectra, exit: electra.ExecutionLayerExit): boolean { | ||
| export function isValidExecutionLayerExit( | ||
| state: CachedBeaconStateElectra, | ||
| exit: electra.ExecutionLayerExit | ||
| ): CompositeViewDU<typeof ssz.phase0.Validator> | null { | ||
| const {config, epochCtx} = state; | ||
| const validatorIndex = epochCtx.getValidatorIndex(exit.validatorPubkey); | ||
| const validator = validatorIndex !== undefined ? state.validators.getReadonly(validatorIndex) : undefined; | ||
| if (validator === undefined) { | ||
| return false; | ||
| return null; | ||
| } | ||
|
|
||
| const {withdrawalCredentials} = validator; | ||
| if (withdrawalCredentials[0] !== ETH1_ADDRESS_WITHDRAWAL_PREFIX) { | ||
| return false; | ||
| return null; | ||
| } | ||
|
|
||
| const executionAddress = withdrawalCredentials.slice(12, 32); | ||
| if (!byteArrayEquals(executionAddress, exit.sourceAddress)) { | ||
| return false; | ||
| const executionAddress = withdrawalCredentials.subarray(12, 32); | ||
| if (Buffer.compare(executionAddress, exit.sourceAddress) !== 0) { | ||
| return null; | ||
| } | ||
|
|
||
| const currentEpoch = epochCtx.epoch; | ||
| return ( | ||
| if ( | ||
| // verify the validator is active | ||
| isActiveValidator(validator, currentEpoch) && | ||
| // verify exit has not been initiated | ||
| validator.exitEpoch === FAR_FUTURE_EPOCH && | ||
| // verify the validator had been active long enough | ||
| currentEpoch >= validator.activationEpoch + config.SHARD_COMMITTEE_PERIOD | ||
| ); | ||
| ) { | ||
| return validator; | ||
| } else { | ||
| return null; | ||
| } | ||
| } |
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