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import * as _ from 'lodash';
import Web3 = require('web3');
import BigNumber from 'bignumber.js';
import promisify = require('es6-promisify');
import {Dispatcher} from 'ts/redux/dispatcher';
export class Web3Wrapper {
private dispatcher: Dispatcher;
private web3: Web3;
private prevNetworkId: number;
private shouldPollUserAddress: boolean;
private watchNetworkAndBalanceIntervalId: number;
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);
this.startEmittingNetworkConnectionAndUserBalanceStateAsync();
}
public isAddress(address: string) {
return this.web3.isAddress(address);
}
public async getAccountsAsync(): Promise<string[]> {
const addresses = await promisify(this.web3.eth.getAccounts)();
return addresses;
}
public async getFirstAccountIfExistsAsync() {
const addresses = await this.getAccountsAsync();
if (_.isEmpty(addresses)) {
return '';
}
return (addresses as string[])[0];
}
public async getNodeVersionAsync() {
const nodeVersion = await promisify(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(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(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(this.web3.eth.sign)(address, message);
return signData;
}
public async getBlockTimestampAsync(blockHash: string): Promise<number> {
const {timestamp} = await promisify(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 = window.setInterval(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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