26 lines
837 B
TypeScript
26 lines
837 B
TypeScript
import { hexUtils } from '@0x/utils';
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import { Web3Wrapper } from '@0x/web3-wrapper';
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import * as ethjs from 'ethereumjs-util';
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/**
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* Fetch and RLP encode the transaction count (nonce) of an account.
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*/
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export async function getRLPEncodedAccountNonceAsync(web3Wrapper: Web3Wrapper, address: string): Promise<string> {
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const nonce = await web3Wrapper.getAccountNonceAsync(address);
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return rlpEncodeNonce(nonce);
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}
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/**
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* RLP encode the transaction count (nonce) of an account.
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*/
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export function rlpEncodeNonce(nonce: number): string {
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if (nonce === 0) {
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return '0x80';
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} else if (nonce <= 0x7f) {
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return ethjs.bufferToHex(ethjs.toBuffer(nonce));
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} else {
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const rlpNonce = ethjs.toBuffer(nonce);
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return hexUtils.concat(rlpNonce.length + 0x80, ethjs.bufferToHex(rlpNonce));
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}
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}
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