@lodestar/beacon-node/lib/chain/validation/voluntaryExit.js

A Typescript implementation of the beacon chain

import { getVoluntaryExitSignatureSet, isValidVoluntaryExit } from "@lodestar/state-transition";
import { GossipAction, VoluntaryExitError, VoluntaryExitErrorCode } from "../errors/index.js";
import { RegenCaller } from "../regen/index.js";
export async function validateApiVoluntaryExit(chain, voluntaryExit) {
    const prioritizeBls = true;
    return validateVoluntaryExit(chain, voluntaryExit, prioritizeBls);
}
export async function validateGossipVoluntaryExit(chain, voluntaryExit) {
    return validateVoluntaryExit(chain, voluntaryExit);
}
async function validateVoluntaryExit(chain, voluntaryExit, prioritizeBls = false) {
    // [IGNORE] The voluntary exit is the first valid voluntary exit received for the validator with index
    // signed_voluntary_exit.message.validator_index.
    if (chain.opPool.hasSeenVoluntaryExit(voluntaryExit.message.validatorIndex)) {
        throw new VoluntaryExitError(GossipAction.IGNORE, {
            code: VoluntaryExitErrorCode.ALREADY_EXISTS,
        });
    }
    // What state should the voluntaryExit validate against?
    //
    // The only condition that is time sensitive and may require a non-head state is
    // -> Validator is active && validator has not initiated exit
    // The voluntaryExit.epoch must be in the past but the validator's status may change in recent epochs.
    // We dial the head state to the current epoch to get the current status of the validator. This is
    // relevant on periods of many skipped slots.
    const state = await chain.getHeadStateAtCurrentEpoch(RegenCaller.validateGossipVoluntaryExit);
    // [REJECT] All of the conditions within process_voluntary_exit pass validation.
    // verifySignature = false, verified in batch below
    if (!isValidVoluntaryExit(chain.config.getForkSeq(state.slot), state, voluntaryExit, false)) {
        throw new VoluntaryExitError(GossipAction.REJECT, {
            code: VoluntaryExitErrorCode.INVALID,
        });
    }
    const signatureSet = getVoluntaryExitSignatureSet(state, voluntaryExit);
    if (!(await chain.bls.verifySignatureSets([signatureSet], { batchable: true, priority: prioritizeBls }))) {
        throw new VoluntaryExitError(GossipAction.REJECT, {
            code: VoluntaryExitErrorCode.INVALID_SIGNATURE,
        });
    }
}
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