deth/dist/esm/vm/getNextBlock.js

Ethereum node focused on Developer Experience

import Block from 'ethereumjs-block';
import BN from 'bn.js';
import { toBuffer } from 'ethereumjs-util';
import { getLatestBlock } from './getLatestBlock';
export async function getNextBlock(vm, transactions, options, clockSkew) {
    const block = await getEmptyNextBlock(vm, options, clockSkew);
    await addTransactionsToBlock(block, transactions);
    return block;
}
async function getEmptyNextBlock(vm, options, clockSkew) {
    const latestBlock = await getLatestBlock(vm);
    const header = {
        gasLimit: options.blockGasLimit,
        nonce: 42,
        timestamp: Math.floor(Date.now() / 1000) + clockSkew,
        number: new BN(latestBlock.header.number).addn(1),
        parentHash: latestBlock.hash(),
        coinbase: options.coinbaseAddress,
    };
    const block = new Block({ header }, { common: vm._common });
    block.validate = (blockchain, cb) => cb(null);
    block.header.difficulty = toBuffer(block.header.canonicalDifficulty(latestBlock));
    return block;
}
async function addTransactionsToBlock(block, transactions) {
    block.transactions.push(...transactions);
    await new Promise((resolve, reject) => {
        block.genTxTrie(err => err != null ? reject(err) : resolve());
    });
    block.header.transactionsTrie = block.txTrie.root;
}