@lodestar/beacon-node/lib/eth1/utils/depositContract.js

A Typescript implementation of the beacon chain

import { Interface } from "@ethersproject/abi";
import { ssz } from "@lodestar/types";
import { fromHex } from "@lodestar/utils";
const depositEventFragment = "event DepositEvent(bytes pubkey, bytes withdrawal_credentials, bytes amount, bytes signature, bytes index)";
const depositContractInterface = new Interface([depositEventFragment]);
/**
 * Precomputed topics of DepositEvent logs
 */
export const depositEventTopics = [depositContractInterface.getEventTopic("DepositEvent")];
/**
 * Parse DepositEvent log
 */
export function parseDepositLog(log) {
    const event = depositContractInterface.parseLog(log);
    const values = event.args;
    if (values === undefined)
        throw Error(`DepositEvent at ${log.blockNumber} has no values`);
    return {
        blockNumber: log.blockNumber,
        index: parseHexNumLittleEndian(values.index),
        depositData: {
            pubkey: fromHex(values.pubkey),
            withdrawalCredentials: fromHex(values.withdrawal_credentials),
            amount: parseHexNumLittleEndian(values.amount),
            signature: fromHex(values.signature),
        },
    };
}
function parseHexNumLittleEndian(hex) {
    // Can't use parseInt() because amount is a hex string in little endian
    return ssz.UintNum64.deserialize(fromHex(hex));
}
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