load testing nearcore payments

load-test.js

const nearlib = require('nearlib');

const { signTransaction, transfer } = nearlib.transactions; 
const { base_decode } = nearlib.utils.serialize;

const sleep = (ms) => new Promise((resolved) => setTimeout(resolved, ms));

(async () => {
    const [,, accountId, txCount] = process.argv;
    const near = await nearlib.connect({...require('near-shell/get-config')(), deps: { keyStore: new nearlib.keyStores.UnencryptedFileSystemKeyStore('./neardev') } });
    const account = await near.account(accountId);

    const status = await account.connection.provider.status();

    let nonce = account._accessKey.nonce;
    let transactions = [];
    for (let i = 0; i < parseInt(txCount); i++) {
        nonce++;
        const actions = [transfer(1)];
        const [txHash, signedTx] = await signTransaction(
            accountId, nonce, actions, base_decode(status.sync_info.latest_block_hash), account.connection.signer, account.accountId, account.connection.networkId
        );

        transactions.push(signedTx);
    }
    console.log('txs', await Promise.all(transactions.map(async (signedTx, i) => {
        try {
            await sleep(i);
            return await account.connection.provider.sendTransaction(signedTx)
        } catch (e) {
            console.log('Error: ', e);
            return null;
        }
    })));
})().then(console.log);

package.json

{
  "dependencies": {
    "near-shell": "^0.10.5",
    "nearlib": "^0.13.2"
  }
}

Use like:

time node load-test.js <accountId> <number of transactions to create>