@chorus-one/ethereum/dist/mjs/lib/utils/getWithdrawalFee.js

All-in-one toolkit for building staking dApps on Ethereum network

import { toHex } from 'viem';
// https://eips.ethereum.org/EIPS/eip-7002#fee-calculation
export const getWithdrawalQueue = async (ethPublicClient, config) => {
    const length = await getWithdrawalQueueLength(ethPublicClient, config);
    const fee = getRequiredFee(config.consolidationRequestFeeAddition, length, config.minConsolidationRequestFee);
    return { length, fee };
};
export const getWithdrawalQueueLength = async (ethPublicClient, config) => {
    let queueLengthHex;
    try {
        queueLengthHex = await ethPublicClient.getStorageAt({
            address: config.withdrawalContractAddress,
            slot: toHex(config.excessWithdrawalRequestsStorageSlot)
        });
        if (!queueLengthHex) {
            throw new Error('Unable to get withdrawal queue length');
        }
        if (queueLengthHex === config.excessInhibitor) {
            throw new Error('Withdrawal queue is disabled');
        }
    }
    catch (error) {
        console.error(error);
        queueLengthHex = '0x0';
    }
    return BigInt(queueLengthHex);
};
const getRequiredFee = (factor, queueLength, denominator) => {
    let i = 1n;
    let output = 0n;
    let numeratorAccum = factor * denominator;
    while (numeratorAccum > 0n) {
        output = output + numeratorAccum;
        numeratorAccum = (numeratorAccum * queueLength) / (i * denominator);
        i = i + 1n;
    }
    return output / denominator;
};