634 lines
28 KiB
TypeScript
634 lines
28 KiB
TypeScript
import { ContractAddresses } from '@0x/contract-addresses';
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import { BlockchainLifecycle, callbackErrorReporter } from '@0x/dev-utils';
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import { EmptyWalletSubprovider, Web3ProviderEngine } from '@0x/subproviders';
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import { DoneCallback } from '@0x/types';
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import { BigNumber, providerUtils } from '@0x/utils';
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import * as chai from 'chai';
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import 'mocha';
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import {
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BlockParamLiteral,
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BlockRange,
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ContractWrappers,
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ContractWrappersConfig,
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ContractWrappersError,
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DecodedLogEvent,
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ERC20TokenApprovalEventArgs,
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ERC20TokenEvents,
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ERC20TokenTransferEventArgs,
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} from '../src';
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import { chaiSetup } from './utils/chai_setup';
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import { constants } from './utils/constants';
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import { migrateOnceAsync } from './utils/migrate';
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import { tokenUtils } from './utils/token_utils';
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import { provider, web3Wrapper } from './utils/web3_wrapper';
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chaiSetup.configure();
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const expect = chai.expect;
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const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
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describe('ERC20Wrapper', () => {
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let contractWrappers: ContractWrappers;
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let contractAddresses: ContractAddresses;
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let userAddresses: string[];
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let tokens: string[];
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let coinbase: string;
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let addressWithoutFunds: string;
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let config: ContractWrappersConfig;
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before(async () => {
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contractAddresses = await migrateOnceAsync();
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config = {
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networkId: constants.TESTRPC_NETWORK_ID,
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contractAddresses,
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blockPollingIntervalMs: 10,
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};
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contractWrappers = new ContractWrappers(provider, config);
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userAddresses = await web3Wrapper.getAvailableAddressesAsync();
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tokens = tokenUtils.getDummyERC20TokenAddresses();
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coinbase = userAddresses[0];
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addressWithoutFunds = userAddresses[1];
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});
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beforeEach(async () => {
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await blockchainLifecycle.startAsync();
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});
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afterEach(async () => {
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await blockchainLifecycle.revertAsync();
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});
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describe('#transferAsync', () => {
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let tokenAddress: string;
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let transferAmount: BigNumber;
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before(() => {
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tokenAddress = tokens[0];
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transferAmount = new BigNumber(42);
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});
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it('should successfully transfer tokens', async () => {
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const fromAddress = coinbase;
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const toAddress = addressWithoutFunds;
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const preBalance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, toAddress);
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expect(preBalance).to.be.bignumber.equal(0);
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await contractWrappers.erc20Token.transferAsync(tokenAddress, fromAddress, toAddress, transferAmount);
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const postBalance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, toAddress);
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return expect(postBalance).to.be.bignumber.equal(transferAmount);
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});
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it('should fail to transfer tokens if fromAddress has an insufficient balance', async () => {
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const fromAddress = addressWithoutFunds;
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const toAddress = coinbase;
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return expect(
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contractWrappers.erc20Token.transferAsync(tokenAddress, fromAddress, toAddress, transferAmount),
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).to.be.rejectedWith(ContractWrappersError.InsufficientBalanceForTransfer);
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});
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});
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describe('#transferFromAsync', () => {
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let tokenAddress: string;
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let toAddress: string;
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let senderAddress: string;
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before(async () => {
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tokenAddress = tokens[0];
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toAddress = addressWithoutFunds;
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senderAddress = userAddresses[2];
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});
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it('should fail to transfer tokens if fromAddress has insufficient allowance set', async () => {
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const fromAddress = coinbase;
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const transferAmount = new BigNumber(42);
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const fromAddressBalance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, fromAddress);
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expect(fromAddressBalance).to.be.bignumber.greaterThan(transferAmount);
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const fromAddressAllowance = await contractWrappers.erc20Token.getAllowanceAsync(
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tokenAddress,
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fromAddress,
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toAddress,
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);
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expect(fromAddressAllowance).to.be.bignumber.equal(0);
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return expect(
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contractWrappers.erc20Token.transferFromAsync(
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tokenAddress,
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fromAddress,
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toAddress,
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senderAddress,
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transferAmount,
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),
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).to.be.rejectedWith(ContractWrappersError.InsufficientAllowanceForTransfer);
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});
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it('[regression] should fail to transfer tokens if set allowance for toAddress instead of senderAddress', async () => {
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const fromAddress = coinbase;
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const transferAmount = new BigNumber(42);
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await contractWrappers.erc20Token.setAllowanceAsync(tokenAddress, fromAddress, toAddress, transferAmount);
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return expect(
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contractWrappers.erc20Token.transferFromAsync(
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tokenAddress,
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fromAddress,
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toAddress,
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senderAddress,
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transferAmount,
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),
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).to.be.rejectedWith(ContractWrappersError.InsufficientAllowanceForTransfer);
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});
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it('should fail to transfer tokens if fromAddress has insufficient balance', async () => {
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const fromAddress = addressWithoutFunds;
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const transferAmount = new BigNumber(42);
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const fromAddressBalance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, fromAddress);
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expect(fromAddressBalance).to.be.bignumber.equal(0);
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await contractWrappers.erc20Token.setAllowanceAsync(
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tokenAddress,
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fromAddress,
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senderAddress,
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transferAmount,
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);
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const fromAddressAllowance = await contractWrappers.erc20Token.getAllowanceAsync(
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tokenAddress,
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fromAddress,
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senderAddress,
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);
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expect(fromAddressAllowance).to.be.bignumber.equal(transferAmount);
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return expect(
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contractWrappers.erc20Token.transferFromAsync(
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tokenAddress,
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fromAddress,
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toAddress,
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senderAddress,
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transferAmount,
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),
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).to.be.rejectedWith(ContractWrappersError.InsufficientBalanceForTransfer);
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});
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it('should successfully transfer tokens', async () => {
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const fromAddress = coinbase;
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const preBalance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, toAddress);
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expect(preBalance).to.be.bignumber.equal(0);
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const transferAmount = new BigNumber(42);
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await contractWrappers.erc20Token.setAllowanceAsync(
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tokenAddress,
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fromAddress,
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senderAddress,
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transferAmount,
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);
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await contractWrappers.erc20Token.transferFromAsync(
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tokenAddress,
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fromAddress,
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toAddress,
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senderAddress,
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transferAmount,
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);
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const postBalance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, toAddress);
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return expect(postBalance).to.be.bignumber.equal(transferAmount);
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});
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});
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describe('#getBalanceAsync', () => {
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describe('With provider with accounts', () => {
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it('should return the balance for an existing ERC20 token', async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const balance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, ownerAddress);
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const expectedBalance = new BigNumber('1000000000000000000000000000');
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return expect(balance).to.be.bignumber.equal(expectedBalance);
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});
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it('should return a balance of 0 for a non-existent owner address', async () => {
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const tokenAddress = tokens[0];
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const nonExistentOwner = '0x198c6ad858f213fb31b6fe809e25040e6b964593';
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const balance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, nonExistentOwner);
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const expectedBalance = new BigNumber(0);
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return expect(balance).to.be.bignumber.equal(expectedBalance);
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});
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});
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describe('With provider without accounts', () => {
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let zeroExContractWithoutAccounts: ContractWrappers;
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before(async () => {
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const emptyWalletProvider = addEmptyWalletSubprovider(provider);
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zeroExContractWithoutAccounts = new ContractWrappers(emptyWalletProvider, config);
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});
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it('should return balance even when called with provider instance without addresses', async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const balance = await zeroExContractWithoutAccounts.erc20Token.getBalanceAsync(
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tokenAddress,
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ownerAddress,
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);
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const expectedBalance = new BigNumber('1000000000000000000000000000');
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return expect(balance).to.be.bignumber.equal(expectedBalance);
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});
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});
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});
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describe('#setAllowanceAsync', () => {
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it("should set the spender's allowance", async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const spenderAddress = addressWithoutFunds;
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const allowanceBeforeSet = await contractWrappers.erc20Token.getAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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);
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const expectedAllowanceBeforeAllowanceSet = new BigNumber(0);
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expect(allowanceBeforeSet).to.be.bignumber.equal(expectedAllowanceBeforeAllowanceSet);
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const amountInBaseUnits = new BigNumber(50);
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await contractWrappers.erc20Token.setAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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amountInBaseUnits,
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);
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const allowanceAfterSet = await contractWrappers.erc20Token.getAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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);
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const expectedAllowanceAfterAllowanceSet = amountInBaseUnits;
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return expect(allowanceAfterSet).to.be.bignumber.equal(expectedAllowanceAfterAllowanceSet);
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});
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});
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describe('#setUnlimitedAllowanceAsync', () => {
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it("should set the unlimited spender's allowance", async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const spenderAddress = addressWithoutFunds;
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await contractWrappers.erc20Token.setUnlimitedAllowanceAsync(tokenAddress, ownerAddress, spenderAddress);
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const allowance = await contractWrappers.erc20Token.getAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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);
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return expect(allowance).to.be.bignumber.equal(
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contractWrappers.erc20Token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
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);
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});
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it('should reduce the gas cost for transfers including tokens with unlimited allowance support', async () => {
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const transferAmount = new BigNumber(5);
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const zrxAddress = contractAddresses.zrxToken;
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const [, userWithNormalAllowance, userWithUnlimitedAllowance] = userAddresses;
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await contractWrappers.erc20Token.setAllowanceAsync(
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zrxAddress,
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coinbase,
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userWithNormalAllowance,
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transferAmount,
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);
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await contractWrappers.erc20Token.setUnlimitedAllowanceAsync(
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zrxAddress,
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coinbase,
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userWithUnlimitedAllowance,
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);
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const initBalanceWithNormalAllowance = await web3Wrapper.getBalanceInWeiAsync(userWithNormalAllowance);
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const initBalanceWithUnlimitedAllowance = await web3Wrapper.getBalanceInWeiAsync(
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userWithUnlimitedAllowance,
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);
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await contractWrappers.erc20Token.transferFromAsync(
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zrxAddress,
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coinbase,
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userWithNormalAllowance,
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userWithNormalAllowance,
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transferAmount,
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);
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await contractWrappers.erc20Token.transferFromAsync(
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zrxAddress,
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coinbase,
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userWithUnlimitedAllowance,
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userWithUnlimitedAllowance,
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transferAmount,
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);
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const finalBalanceWithNormalAllowance = await web3Wrapper.getBalanceInWeiAsync(userWithNormalAllowance);
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const finalBalanceWithUnlimitedAllowance = await web3Wrapper.getBalanceInWeiAsync(
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userWithUnlimitedAllowance,
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);
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const normalGasCost = initBalanceWithNormalAllowance.minus(finalBalanceWithNormalAllowance);
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const unlimitedGasCost = initBalanceWithUnlimitedAllowance.minus(finalBalanceWithUnlimitedAllowance);
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// In theory the gas cost with unlimited allowance should be smaller, but with testrpc it's actually bigger.
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// This needs to be investigated in ethereumjs-vm. This test is essentially a repro.
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// TODO: Make this test pass with inverted assertion.
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expect(unlimitedGasCost.toNumber()).to.be.gt(normalGasCost.toNumber());
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});
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});
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describe('#getAllowanceAsync', () => {
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describe('With provider with accounts', () => {
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it('should get the proxy allowance', async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const spenderAddress = addressWithoutFunds;
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const amountInBaseUnits = new BigNumber(50);
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await contractWrappers.erc20Token.setAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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amountInBaseUnits,
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);
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const allowance = await contractWrappers.erc20Token.getAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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);
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const expectedAllowance = amountInBaseUnits;
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return expect(allowance).to.be.bignumber.equal(expectedAllowance);
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});
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it('should return 0 if no allowance set yet', async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const spenderAddress = addressWithoutFunds;
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const allowance = await contractWrappers.erc20Token.getAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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);
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const expectedAllowance = new BigNumber(0);
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return expect(allowance).to.be.bignumber.equal(expectedAllowance);
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});
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});
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describe('With provider without accounts', () => {
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let zeroExContractWithoutAccounts: ContractWrappers;
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before(async () => {
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const emptyWalletProvider = addEmptyWalletSubprovider(provider);
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zeroExContractWithoutAccounts = new ContractWrappers(emptyWalletProvider, config);
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});
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it('should get the proxy allowance', async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const spenderAddress = addressWithoutFunds;
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const amountInBaseUnits = new BigNumber(50);
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await contractWrappers.erc20Token.setAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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amountInBaseUnits,
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);
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const allowance = await zeroExContractWithoutAccounts.erc20Token.getAllowanceAsync(
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tokenAddress,
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ownerAddress,
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spenderAddress,
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);
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const expectedAllowance = amountInBaseUnits;
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return expect(allowance).to.be.bignumber.equal(expectedAllowance);
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});
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});
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});
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describe('#getProxyAllowanceAsync', () => {
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it('should get the proxy allowance', async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const amountInBaseUnits = new BigNumber(50);
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await contractWrappers.erc20Token.setProxyAllowanceAsync(tokenAddress, ownerAddress, amountInBaseUnits);
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const allowance = await contractWrappers.erc20Token.getProxyAllowanceAsync(tokenAddress, ownerAddress);
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const expectedAllowance = amountInBaseUnits;
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return expect(allowance).to.be.bignumber.equal(expectedAllowance);
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});
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});
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describe('#setProxyAllowanceAsync', () => {
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it('should set the proxy allowance', async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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const allowanceBeforeSet = await contractWrappers.erc20Token.getProxyAllowanceAsync(
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tokenAddress,
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ownerAddress,
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);
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const expectedAllowanceBeforeAllowanceSet = new BigNumber(0);
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expect(allowanceBeforeSet).to.be.bignumber.equal(expectedAllowanceBeforeAllowanceSet);
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const amountInBaseUnits = new BigNumber(50);
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await contractWrappers.erc20Token.setProxyAllowanceAsync(tokenAddress, ownerAddress, amountInBaseUnits);
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const allowanceAfterSet = await contractWrappers.erc20Token.getProxyAllowanceAsync(
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tokenAddress,
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ownerAddress,
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);
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const expectedAllowanceAfterAllowanceSet = amountInBaseUnits;
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return expect(allowanceAfterSet).to.be.bignumber.equal(expectedAllowanceAfterAllowanceSet);
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});
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});
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describe('#setUnlimitedProxyAllowanceAsync', () => {
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it('should set the unlimited proxy allowance', async () => {
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const tokenAddress = tokens[0];
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const ownerAddress = coinbase;
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await contractWrappers.erc20Token.setUnlimitedProxyAllowanceAsync(tokenAddress, ownerAddress);
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const allowance = await contractWrappers.erc20Token.getProxyAllowanceAsync(tokenAddress, ownerAddress);
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return expect(allowance).to.be.bignumber.equal(
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contractWrappers.erc20Token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
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);
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});
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});
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describe('#subscribe', () => {
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const indexFilterValues = {};
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let tokenAddress: string;
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const transferAmount = new BigNumber(42);
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const allowanceAmount = new BigNumber(42);
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before(() => {
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tokenAddress = tokens[0];
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});
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afterEach(() => {
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contractWrappers.erc20Token.unsubscribeAll();
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});
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// Hack: Mocha does not allow a test to be both async and have a `done` callback
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// Since we need to await the receipt of the event in the `subscribe` callback,
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// we do need both. A hack is to make the top-level a sync fn w/ a done callback and then
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// wrap the rest of the test in an async block
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// Source: https://github.com/mochajs/mocha/issues/2407
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it('Should receive the Transfer event when tokens are transfered', (done: DoneCallback) => {
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(async () => {
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const callback = callbackErrorReporter.reportNodeCallbackErrors(done)(
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(logEvent: DecodedLogEvent<ERC20TokenTransferEventArgs>) => {
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expect(logEvent.isRemoved).to.be.false();
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expect(logEvent.log.logIndex).to.be.equal(0);
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expect(logEvent.log.transactionIndex).to.be.equal(0);
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expect(logEvent.log.blockNumber).to.be.a('number');
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const args = logEvent.log.args;
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expect(args._from).to.be.equal(coinbase);
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expect(args._to).to.be.equal(addressWithoutFunds);
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expect(args._value).to.be.bignumber.equal(transferAmount);
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},
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);
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contractWrappers.erc20Token.subscribe(
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tokenAddress,
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ERC20TokenEvents.Transfer,
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indexFilterValues,
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callback,
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);
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await contractWrappers.erc20Token.transferAsync(
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tokenAddress,
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coinbase,
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addressWithoutFunds,
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transferAmount,
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);
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})().catch(done);
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});
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it('Should receive the Approval event when allowance is being set', (done: DoneCallback) => {
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(async () => {
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const callback = callbackErrorReporter.reportNodeCallbackErrors(done)(
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(logEvent: DecodedLogEvent<ERC20TokenApprovalEventArgs>) => {
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expect(logEvent).to.not.be.undefined();
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expect(logEvent.isRemoved).to.be.false();
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const args = logEvent.log.args;
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expect(args._owner).to.be.equal(coinbase);
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expect(args._spender).to.be.equal(addressWithoutFunds);
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expect(args._value).to.be.bignumber.equal(allowanceAmount);
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},
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);
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contractWrappers.erc20Token.subscribe(
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tokenAddress,
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ERC20TokenEvents.Approval,
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indexFilterValues,
|
|
callback,
|
|
);
|
|
await contractWrappers.erc20Token.setAllowanceAsync(
|
|
tokenAddress,
|
|
coinbase,
|
|
addressWithoutFunds,
|
|
allowanceAmount,
|
|
);
|
|
})().catch(done);
|
|
});
|
|
it('Outstanding subscriptions are cancelled when contractWrappers.unsubscribeAll called', (done: DoneCallback) => {
|
|
(async () => {
|
|
const callbackNeverToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)(
|
|
(_logEvent: DecodedLogEvent<ERC20TokenApprovalEventArgs>) => {
|
|
done(new Error('Expected this subscription to have been cancelled'));
|
|
},
|
|
);
|
|
contractWrappers.erc20Token.subscribe(
|
|
tokenAddress,
|
|
ERC20TokenEvents.Transfer,
|
|
indexFilterValues,
|
|
callbackNeverToBeCalled,
|
|
);
|
|
const callbackToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)();
|
|
contractWrappers.unsubscribeAll();
|
|
contractWrappers.erc20Token.subscribe(
|
|
tokenAddress,
|
|
ERC20TokenEvents.Transfer,
|
|
indexFilterValues,
|
|
callbackToBeCalled,
|
|
);
|
|
await contractWrappers.erc20Token.transferAsync(
|
|
tokenAddress,
|
|
coinbase,
|
|
addressWithoutFunds,
|
|
transferAmount,
|
|
);
|
|
})().catch(done);
|
|
});
|
|
it('Should cancel subscription when unsubscribe called', (done: DoneCallback) => {
|
|
(async () => {
|
|
const callbackNeverToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)(
|
|
(_logEvent: DecodedLogEvent<ERC20TokenApprovalEventArgs>) => {
|
|
done(new Error('Expected this subscription to have been cancelled'));
|
|
},
|
|
);
|
|
const subscriptionToken = contractWrappers.erc20Token.subscribe(
|
|
tokenAddress,
|
|
ERC20TokenEvents.Transfer,
|
|
indexFilterValues,
|
|
callbackNeverToBeCalled,
|
|
);
|
|
contractWrappers.erc20Token.unsubscribe(subscriptionToken);
|
|
await contractWrappers.erc20Token.transferAsync(
|
|
tokenAddress,
|
|
coinbase,
|
|
addressWithoutFunds,
|
|
transferAmount,
|
|
);
|
|
done();
|
|
})().catch(done);
|
|
});
|
|
});
|
|
describe('#getLogsAsync', () => {
|
|
let tokenAddress: string;
|
|
let tokenTransferProxyAddress: string;
|
|
const blockRange: BlockRange = {
|
|
fromBlock: 0,
|
|
toBlock: BlockParamLiteral.Latest,
|
|
};
|
|
let txHash: string;
|
|
before(() => {
|
|
tokenAddress = tokens[0];
|
|
tokenTransferProxyAddress = contractWrappers.erc20Proxy.address;
|
|
});
|
|
it('should get logs with decoded args emitted by Approval', async () => {
|
|
txHash = await contractWrappers.erc20Token.setUnlimitedProxyAllowanceAsync(tokenAddress, coinbase);
|
|
await web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
|
|
const eventName = ERC20TokenEvents.Approval;
|
|
const indexFilterValues = {};
|
|
const logs = await contractWrappers.erc20Token.getLogsAsync<ERC20TokenApprovalEventArgs>(
|
|
tokenAddress,
|
|
eventName,
|
|
blockRange,
|
|
indexFilterValues,
|
|
);
|
|
expect(logs).to.have.length(1);
|
|
const args = logs[0].args;
|
|
expect(logs[0].event).to.be.equal(eventName);
|
|
expect(args._owner).to.be.equal(coinbase);
|
|
expect(args._spender).to.be.equal(tokenTransferProxyAddress);
|
|
expect(args._value).to.be.bignumber.equal(contractWrappers.erc20Token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS);
|
|
});
|
|
it('should only get the logs with the correct event name', async () => {
|
|
txHash = await contractWrappers.erc20Token.setUnlimitedProxyAllowanceAsync(tokenAddress, coinbase);
|
|
await web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
|
|
const differentEventName = ERC20TokenEvents.Transfer;
|
|
const indexFilterValues = {};
|
|
const logs = await contractWrappers.erc20Token.getLogsAsync(
|
|
tokenAddress,
|
|
differentEventName,
|
|
blockRange,
|
|
indexFilterValues,
|
|
);
|
|
expect(logs).to.have.length(0);
|
|
});
|
|
it('should only get the logs with the correct indexed fields', async () => {
|
|
txHash = await contractWrappers.erc20Token.setUnlimitedProxyAllowanceAsync(tokenAddress, coinbase);
|
|
await web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
|
|
txHash = await contractWrappers.erc20Token.setUnlimitedProxyAllowanceAsync(
|
|
tokenAddress,
|
|
addressWithoutFunds,
|
|
);
|
|
await web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
|
|
const eventName = ERC20TokenEvents.Approval;
|
|
const indexFilterValues = {
|
|
_owner: coinbase,
|
|
};
|
|
const logs = await contractWrappers.erc20Token.getLogsAsync<ERC20TokenApprovalEventArgs>(
|
|
tokenAddress,
|
|
eventName,
|
|
blockRange,
|
|
indexFilterValues,
|
|
);
|
|
expect(logs).to.have.length(1);
|
|
const args = logs[0].args;
|
|
expect(args._owner).to.be.equal(coinbase);
|
|
});
|
|
});
|
|
});
|
|
// tslint:disable:max-file-line-count
|
|
|
|
function addEmptyWalletSubprovider(p: Web3ProviderEngine): Web3ProviderEngine {
|
|
const providerEngine = new Web3ProviderEngine();
|
|
providerEngine.addProvider(new EmptyWalletSubprovider());
|
|
const currentSubproviders = (p as any)._providers;
|
|
for (const subprovider of currentSubproviders) {
|
|
providerEngine.addProvider(subprovider);
|
|
}
|
|
providerUtils.startProviderEngine(providerEngine);
|
|
return providerEngine;
|
|
}
|