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import * as _ from 'lodash';
import * as Web3 from 'web3';
import * as BigNumber from 'bignumber.js';
import promisify = require('es6-promisify');
import {ZeroExError} from './types';
import {Contract} from './contract';
export class Web3Wrapper {
private web3: Web3;
private defaults: Partial<Web3.TxData>;
private networkIdIfExists?: number;
constructor(provider: Web3.Provider, defaults: Partial<Web3.TxData>) {
this.web3 = new Web3();
this.web3.setProvider(provider);
this.defaults = defaults;
}
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<Web3.TransactionReceipt> {
const transactionReceipt = await promisify(this.web3.eth.getTransactionReceipt)(txHash);
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): BigNumber.BigNumber {
const balanceWei = this.web3.toWei(ethAmount, 'ether');
return balanceWei;
}
public async getBalanceInWeiAsync(owner: string): Promise<BigNumber.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 getBlockTimestampAsync(blockHash: string): Promise<number> {
const {timestamp} = await promisify(this.web3.eth.getBlock)(blockHash);
return timestamp;
}
public async getAvailableAddressesAsync(): Promise<string[]> {
const addresses: string[] = await promisify(this.web3.eth.getAccounts)();
return addresses;
}
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;
}
}
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