loadtest.js

// Node.JS 8 or greater
const Web3 = require('web3')
const {
  NonceTxMiddleware, SignedTxMiddleware, Client,
  Contract, Address, LocalAddress, CryptoUtils
} = require('loom-js')
const LoomTruffleProvider = require('loom-truffle-provider')
const fs = require('fs')
const conf = require('./config')

//const privateKeyStr = fs.readFileSync('./private_key', 'utf-8')
//const privateKey = CryptoUtils.B64ToUint8Array(privateKeyStr)
//const publicKey = CryptoUtils.publicKeyFromPrivateKey(privateKey)

const privateKey = CryptoUtils.generatePrivateKey()
const publicKey = CryptoUtils.publicKeyFromPrivateKey(privateKey)

var simpleStoreJson = JSON.parse(fs.readFileSync('./build/contracts/LoadTestContract.json', 'utf8'));

const loomTruffleProvider = new LoomTruffleProvider(conf.chainId, conf.url + "/rpc", conf.url + "/query", privateKey)
const loomProvider = loomTruffleProvider.getProviderEngine()

var client = new Client(
  conf.chainId,
  conf.url + "/websocket",
  conf.url + "/queryws"
);
client.on("error", msg => {
  console.error("Error on connect to client", msg);
  console.warn("Please verify if loom command is running");
});
const setupMiddlewareFn = function (client, privateKey) {
  const publicKey = CryptoUtils.publicKeyFromPrivateKey(privateKey);
  return [
    new SpeculativeNonceTxMiddleware(publicKey, client),
    new SignedTxMiddleware(privateKey)
  ];
};
var loomProvider = new LoomProvider(client, privateKey, setupMiddlewareFn);

// The address for the caller of the function
const from = LocalAddress.fromPublicKey(publicKey).toString()
// Instantiate web3 client using LoomProvider
const web3 = new Web3(loomProvider)

const contractAddress = conf.contractAddress
console.log(contractAddress)
// Instantiate the contract and let it ready to be used
const contract = new web3.eth.Contract(simpleStoreJson.abi, contractAddress, {from});

(async function (){
  try {
    for(var i=0; i<100; i++) {
       contract.methods.storageConsumption(300).send().then()
    } 
    const tx = await contract.methods.storageConsumption(300).send()
    console.log(tx)
  } catch(err) {
    console.log(err)
  }
})();