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diff --git a/packages/web3-wrapper/src/web3_wrapper.ts b/packages/web3-wrapper/src/web3_wrapper.ts
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+import { TransactionReceipt, TxData } from '@0xproject/types';
+import { BigNumber, promisify } from '@0xproject/utils';
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+interface RawLogEntry {
+ logIndex: string | null;
+ transactionIndex: string | null;
+ transactionHash: string;
+ blockHash: string | null;
+ blockNumber: string | null;
+ address: string;
+ data: string;
+ topics: string[];
+}
+
+export class Web3Wrapper {
+ private _web3: Web3;
+ private _defaults: Partial<TxData>;
+ private _jsonRpcRequestId: number;
+ constructor(provider: Web3.Provider, defaults?: Partial<TxData>) {
+ if (_.isUndefined((provider as any).sendAsync)) {
+ // Web3@1.0 provider doesn't support synchronous http requests,
+ // so it only has an async `send` method, instead of a `send` and `sendAsync` in web3@0.x.x`
+ // We re-assign the send method so that Web3@1.0 providers work with 0x.js
+ (provider as any).sendAsync = (provider as any).send;
+ }
+ this._web3 = new Web3();
+ this._web3.setProvider(provider);
+ this._defaults = defaults || {};
+ this._jsonRpcRequestId = 0;
+ }
+ public getContractDefaults(): Partial<TxData> {
+ return this._defaults;
+ }
+ public setProvider(provider: Web3.Provider) {
+ this._web3.setProvider(provider);
+ }
+ public isAddress(address: string): boolean {
+ return this._web3.isAddress(address);
+ }
+ public async isSenderAddressAvailableAsync(senderAddress: string): Promise<boolean> {
+ const addresses = await this.getAvailableAddressesAsync();
+ const normalizedAddress = senderAddress.toLowerCase();
+ return _.includes(addresses, normalizedAddress);
+ }
+ public async getNodeVersionAsync(): Promise<string> {
+ const nodeVersion = await promisify<string>(this._web3.version.getNode)();
+ return nodeVersion;
+ }
+ public async getNetworkIdAsync(): Promise<number> {
+ const networkIdStr = await promisify<string>(this._web3.version.getNetwork)();
+ const networkId = _.parseInt(networkIdStr);
+ return networkId;
+ }
+ public async getTransactionReceiptAsync(txHash: string): Promise<TransactionReceipt> {
+ const transactionReceipt = await promisify<TransactionReceipt>(this._web3.eth.getTransactionReceipt)(txHash);
+ if (!_.isNull(transactionReceipt)) {
+ transactionReceipt.status = this._normalizeTxReceiptStatus(transactionReceipt.status);
+ }
+ return transactionReceipt;
+ }
+ public getCurrentProvider(): Web3.Provider {
+ return this._web3.currentProvider;
+ }
+ public toWei(ethAmount: BigNumber): BigNumber {
+ const balanceWei = this._web3.toWei(ethAmount, 'ether');
+ return balanceWei;
+ }
+ public async getBalanceInWeiAsync(owner: string): Promise<BigNumber> {
+ let balanceInWei = await promisify<BigNumber>(this._web3.eth.getBalance)(owner);
+ // Rewrap in a new BigNumber
+ balanceInWei = new BigNumber(balanceInWei);
+ return balanceInWei;
+ }
+ public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
+ const code = await promisify<string>(this._web3.eth.getCode)(address);
+ // Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
+ const codeIsEmpty = /^0x0{0,40}$/i.test(code);
+ return !codeIsEmpty;
+ }
+ public async signTransactionAsync(address: string, message: string): Promise<string> {
+ const signData = await promisify<string>(this._web3.eth.sign)(address, message);
+ return signData;
+ }
+ public async getBlockNumberAsync(): Promise<number> {
+ const blockNumber = await promisify<number>(this._web3.eth.getBlockNumber)();
+ return blockNumber;
+ }
+ public async getBlockAsync(blockParam: string | Web3.BlockParam): Promise<Web3.BlockWithoutTransactionData> {
+ const block = await promisify<Web3.BlockWithoutTransactionData>(this._web3.eth.getBlock)(blockParam);
+ return block;
+ }
+ public async getBlockTimestampAsync(blockParam: string | Web3.BlockParam): Promise<number> {
+ const { timestamp } = await this.getBlockAsync(blockParam);
+ return timestamp;
+ }
+ public async getAvailableAddressesAsync(): Promise<string[]> {
+ const addresses = await promisify<string[]>(this._web3.eth.getAccounts)();
+ const normalizedAddresses = _.map(addresses, address => address.toLowerCase());
+ return normalizedAddresses;
+ }
+ public async getLogsAsync(filter: Web3.FilterObject): Promise<Web3.LogEntry[]> {
+ let fromBlock = filter.fromBlock;
+ if (_.isNumber(fromBlock)) {
+ fromBlock = this._web3.toHex(fromBlock);
+ }
+ let toBlock = filter.toBlock;
+ if (_.isNumber(toBlock)) {
+ toBlock = this._web3.toHex(toBlock);
+ }
+ const serializedFilter = {
+ ...filter,
+ fromBlock,
+ toBlock,
+ };
+ const payload = {
+ jsonrpc: '2.0',
+ id: this._jsonRpcRequestId++,
+ method: 'eth_getLogs',
+ params: [serializedFilter],
+ };
+ const rawLogs = await this._sendRawPayloadAsync<RawLogEntry[]>(payload);
+ const formattedLogs = _.map(rawLogs, this._formatLog.bind(this));
+ return formattedLogs;
+ }
+ public getContractFromAbi(abi: Web3.ContractAbi): Web3.Contract<any> {
+ const web3Contract = this._web3.eth.contract(abi);
+ return web3Contract;
+ }
+ public async estimateGasAsync(txData: Partial<Web3.TxData>): Promise<number> {
+ const gas = await promisify<number>(this._web3.eth.estimateGas)(txData);
+ return gas;
+ }
+ public async callAsync(callData: Web3.CallData, defaultBlock?: Web3.BlockParam): Promise<string> {
+ const rawCalllResult = await promisify<string>(this._web3.eth.call)(callData, defaultBlock);
+ return rawCalllResult;
+ }
+ public async sendTransactionAsync(txData: Web3.TxData): Promise<string> {
+ const txHash = await promisify<string>(this._web3.eth.sendTransaction)(txData);
+ return txHash;
+ }
+ private async _sendRawPayloadAsync<A>(payload: Web3.JSONRPCRequestPayload): Promise<A> {
+ const sendAsync = this._web3.currentProvider.sendAsync.bind(this._web3.currentProvider);
+ const response = await promisify<Web3.JSONRPCResponsePayload>(sendAsync)(payload);
+ const result = response.result;
+ return result;
+ }
+ private _normalizeTxReceiptStatus(status: undefined | null | string | 0 | 1): null | 0 | 1 {
+ // Transaction status might have four values
+ // undefined - Testrpc and other old clients
+ // null - New clients on old transactions
+ // number - Parity
+ // hex - Geth
+ if (_.isString(status)) {
+ return this._web3.toDecimal(status) as 0 | 1;
+ } else if (_.isUndefined(status)) {
+ return null;
+ } else {
+ return status;
+ }
+ }
+ private _formatLog(rawLog: RawLogEntry): Web3.LogEntry {
+ const formattedLog = {
+ ...rawLog,
+ logIndex: this._hexToDecimal(rawLog.logIndex),
+ blockNumber: this._hexToDecimal(rawLog.blockNumber),
+ transactionIndex: this._hexToDecimal(rawLog.transactionIndex),
+ };
+ return formattedLog;
+ }
+ private _hexToDecimal(hex: string | null): number | null {
+ if (_.isNull(hex)) {
+ return null;
+ }
+ const decimal = this._web3.toDecimal(hex);
+ return decimal;
+ }
+}