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import * as _ from 'lodash';
import * as Web3 from 'web3';
import BigNumber from 'bignumber.js';
import promisify = require('es6-promisify');
import {ZeroExError, Artifact, TransactionReceipt} from './types';
import {Contract} from './contract';
export class Web3Wrapper {
private web3: Web3;
private defaults: Partial<Web3.TxData>;
private networkIdIfExists?: number;
private jsonRpcRequestId: number;
constructor(provider: Web3.Provider, defaults?: Partial<Web3.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 setProvider(provider: Web3.Provider) {
delete this.networkIdIfExists;
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();
return _.includes(addresses, senderAddress);
}
public async getNodeVersionAsync(): Promise<string> {
const nodeVersion = await promisify(this.web3.version.getNode)();
return nodeVersion;
}
public async getTransactionReceiptAsync(txHash: string): Promise<TransactionReceipt> {
const transactionReceipt = await promisify(this.web3.eth.getTransactionReceipt)(txHash);
transactionReceipt.status = this.normalizeTxReceiptStatus(transactionReceipt.status);
return transactionReceipt;
}
public getCurrentProvider(): Web3.Provider {
return this.web3.currentProvider;
}
public async getNetworkIdIfExistsAsync(): Promise<number|undefined> {
if (!_.isUndefined(this.networkIdIfExists)) {
return this.networkIdIfExists;
}
try {
const networkId = await this.getNetworkAsync();
this.networkIdIfExists = Number(networkId);
return this.networkIdIfExists;
} catch (err) {
return undefined;
}
}
public async getContractInstanceFromArtifactAsync<A extends Web3.ContractInstance>(artifact: Artifact,
address?: string): Promise<A> {
let contractAddress: string;
if (_.isUndefined(address)) {
const networkIdIfExists = await this.getNetworkIdIfExistsAsync();
if (_.isUndefined(networkIdIfExists)) {
throw new Error(ZeroExError.NoNetworkId);
}
if (_.isUndefined(artifact.networks[networkIdIfExists])) {
throw new Error(ZeroExError.ContractNotDeployedOnNetwork);
}
contractAddress = artifact.networks[networkIdIfExists].address.toLowerCase();
} else {
contractAddress = address;
}
const doesContractExist = await this.doesContractExistAtAddressAsync(contractAddress);
if (!doesContractExist) {
throw new Error(ZeroExError.ContractDoesNotExist);
}
const contractInstance = this.getContractInstance<A>(
artifact.abi, contractAddress,
);
return contractInstance;
}
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(this.web3.eth.getBalance)(owner);
balanceInWei = new BigNumber(balanceInWei);
return balanceInWei;
}
public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
const code = await promisify(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(this.web3.eth.sign)(address, message);
return signData;
}
public async getBlockNumberAsync(): Promise<number> {
const blockNumber = await promisify(this.web3.eth.getBlockNumber)();
return blockNumber;
}
public async getBlockAsync(blockParam: string|Web3.BlockParam): Promise<Web3.BlockWithoutTransactionData> {
const block = await promisify(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: string[] = await promisify(this.web3.eth.getAccounts)();
return addresses;
}
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 logs = await this.sendRawPayloadAsync(payload);
return logs;
}
private getContractInstance<A extends Web3.ContractInstance>(abi: Web3.ContractAbi, address: string): A {
const web3ContractInstance = this.web3.eth.contract(abi).at(address);
const contractInstance = new Contract(web3ContractInstance, this.defaults) as any as A;
return contractInstance;
}
private async getNetworkAsync(): Promise<number> {
const networkId = await promisify(this.web3.version.getNetwork)();
return networkId;
}
private async sendRawPayloadAsync(payload: Web3.JSONRPCRequestPayload): Promise<any> {
const sendAsync = this.web3.currentProvider.sendAsync.bind(this.web3.currentProvider);
const response = await promisify(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;
}
}
}
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