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import {intervalUtils, promisify} from '@0xproject/utils';
import BigNumber from 'bignumber.js';
import * as _ from 'lodash';
import {Dispatcher} from 'ts/redux/dispatcher';
import * as Web3 from 'web3';
export class Web3Wrapper {
private _dispatcher: Dispatcher;
private _web3: Web3;
private _prevNetworkId: number;
private _shouldPollUserAddress: boolean;
private _watchNetworkAndBalanceIntervalId: NodeJS.Timer;
private _prevUserEtherBalanceInEth: BigNumber;
private _prevUserAddress: string;
constructor(dispatcher: Dispatcher, provider: Web3.Provider, networkIdIfExists: number,
shouldPollUserAddress: boolean) {
this._dispatcher = dispatcher;
this._prevNetworkId = networkIdIfExists;
this._shouldPollUserAddress = shouldPollUserAddress;
this._web3 = new Web3();
this._web3.setProvider(provider);
// tslint:disable-next-line:no-floating-promises
this._startEmittingNetworkConnectionAndUserBalanceStateAsync();
}
public isAddress(address: string) {
return this._web3.isAddress(address);
}
public async getAccountsAsync(): Promise<string[]> {
const addresses = await promisify<string[]>(this._web3.eth.getAccounts)();
return addresses;
}
public async getFirstAccountIfExistsAsync() {
const addresses = await this.getAccountsAsync();
if (_.isEmpty(addresses)) {
return '';
}
return (addresses)[0];
}
public async getNodeVersionAsync(): Promise<string> {
const nodeVersion = await promisify<string>(this._web3.version.getNode)();
return nodeVersion;
}
public getProviderObj() {
return this._web3.currentProvider;
}
public async getNetworkIdIfExists() {
try {
const networkId = await this._getNetworkAsync();
return Number(networkId);
} catch (err) {
return undefined;
}
}
public async getBalanceInEthAsync(owner: string): Promise<BigNumber> {
const balanceInWei: BigNumber = await promisify<BigNumber>(this._web3.eth.getBalance)(owner);
const balanceEthOldBigNumber = this._web3.fromWei(balanceInWei, 'ether');
const balanceEth = new BigNumber(balanceEthOldBigNumber);
return balanceEth;
}
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 accomodate poorly implemented clients
const zeroHexAddressRegex = /^0[xX][0]*$/;
const didFindCode = _.isNull(code.match(zeroHexAddressRegex));
return didFindCode;
}
public async signTransactionAsync(address: string, message: string): Promise<string> {
const signData = await promisify<string>(this._web3.eth.sign)(address, message);
return signData;
}
public async getBlockTimestampAsync(blockHash: string): Promise<number> {
const {timestamp} = await promisify<Web3.BlockWithoutTransactionData>(this._web3.eth.getBlock)(blockHash);
return timestamp;
}
public destroy() {
this._stopEmittingNetworkConnectionAndUserBalanceStateAsync();
// HACK: stop() is only available on providerEngine instances
const provider = this._web3.currentProvider;
if (!_.isUndefined((provider as any).stop)) {
(provider as any).stop();
}
}
// This should only be called from the LedgerConfigDialog
public updatePrevUserAddress(userAddress: string) {
this._prevUserAddress = userAddress;
}
private async _getNetworkAsync() {
const networkId = await promisify(this._web3.version.getNetwork)();
return networkId;
}
private async _startEmittingNetworkConnectionAndUserBalanceStateAsync() {
if (!_.isUndefined(this._watchNetworkAndBalanceIntervalId)) {
return; // we are already emitting the state
}
let prevNodeVersion: string;
this._prevUserEtherBalanceInEth = new BigNumber(0);
this._dispatcher.updateNetworkId(this._prevNetworkId);
this._watchNetworkAndBalanceIntervalId = intervalUtils.setAsyncExcludingInterval(async () => {
// Check for network state changes
const currentNetworkId = await this.getNetworkIdIfExists();
if (currentNetworkId !== this._prevNetworkId) {
this._prevNetworkId = currentNetworkId;
this._dispatcher.updateNetworkId(currentNetworkId);
}
// Check for node version changes
const currentNodeVersion = await this.getNodeVersionAsync();
if (currentNodeVersion !== prevNodeVersion) {
prevNodeVersion = currentNodeVersion;
this._dispatcher.updateNodeVersion(currentNodeVersion);
}
if (this._shouldPollUserAddress) {
const userAddressIfExists = await this.getFirstAccountIfExistsAsync();
// Update makerAddress on network change
if (this._prevUserAddress !== userAddressIfExists) {
this._prevUserAddress = userAddressIfExists;
this._dispatcher.updateUserAddress(userAddressIfExists);
}
// Check for user ether balance changes
if (userAddressIfExists !== '') {
await this._updateUserEtherBalanceAsync(userAddressIfExists);
}
} else {
// This logic is primarily for the Ledger, since we don't regularly poll for the address
// we simply update the balance for the last fetched address.
if (!_.isEmpty(this._prevUserAddress)) {
await this._updateUserEtherBalanceAsync(this._prevUserAddress);
}
}
}, 5000);
}
private async _updateUserEtherBalanceAsync(userAddress: string) {
const balance = await this.getBalanceInEthAsync(userAddress);
if (!balance.eq(this._prevUserEtherBalanceInEth)) {
this._prevUserEtherBalanceInEth = balance;
this._dispatcher.updateUserEtherBalance(balance);
}
}
private _stopEmittingNetworkConnectionAndUserBalanceStateAsync() {
clearInterval(this._watchNetworkAndBalanceIntervalId);
}
}
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