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import { schemas } from '@0xproject/json-schemas';
import { BigNumber } from '@0xproject/utils';
import { Web3Wrapper } from '@0xproject/web3-wrapper';
import { ContractAbi, LogWithDecodedArgs } from 'ethereum-types';
import * as _ from 'lodash';
import { artifacts } from '../artifacts';
import { BlockRange, ContractWrappersError, EventCallback, IndexedFilterValues, TransactionOpts } from '../types';
import { assert } from '../utils/assert';
import { ContractWrapper } from './contract_wrapper';
import { ERC20TokenWrapper } from './erc20_token_wrapper';
import { WETH9Contract, WETH9EventArgs, WETH9Events } from './generated/weth9';
/**
* This class includes all the functionality related to interacting with a wrapped Ether ERC20 token contract.
* The caller can convert ETH into the equivalent number of wrapped ETH ERC20 tokens and back.
*/
export class EtherTokenWrapper extends ContractWrapper {
public abi: ContractAbi = artifacts.EtherToken.compilerOutput.abi;
private _etherTokenContractsByAddress: {
[address: string]: WETH9Contract;
} = {};
private _erc20TokenWrapper: ERC20TokenWrapper;
constructor(web3Wrapper: Web3Wrapper, networkId: number, erc20TokenWrapper: ERC20TokenWrapper) {
super(web3Wrapper, networkId);
this._erc20TokenWrapper = erc20TokenWrapper;
}
/**
* Deposit ETH into the Wrapped ETH smart contract and issues the equivalent number of wrapped ETH tokens
* to the depositor address. These wrapped ETH tokens can be used in 0x trades and are redeemable for 1-to-1
* for ETH.
* @param etherTokenAddress EtherToken address you wish to deposit into.
* @param amountInWei Amount of ETH in Wei the caller wishes to deposit.
* @param depositor The hex encoded user Ethereum address that would like to make the deposit.
* @param txOpts Transaction parameters.
* @return Transaction hash.
*/
public async depositAsync(
etherTokenAddress: string,
amountInWei: BigNumber,
depositor: string,
txOpts: TransactionOpts = {},
): Promise<string> {
assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
assert.isValidBaseUnitAmount('amountInWei', amountInWei);
await assert.isSenderAddressAsync('depositor', depositor, this._web3Wrapper);
const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
const normalizedDepositorAddress = depositor.toLowerCase();
const ethBalanceInWei = await this._web3Wrapper.getBalanceInWeiAsync(normalizedDepositorAddress);
assert.assert(ethBalanceInWei.gte(amountInWei), ContractWrappersError.InsufficientEthBalanceForDeposit);
const wethContract = await this._getEtherTokenContractAsync(normalizedEtherTokenAddress);
const txHash = await wethContract.deposit.sendTransactionAsync({
from: normalizedDepositorAddress,
value: amountInWei,
gas: txOpts.gasLimit,
gasPrice: txOpts.gasPrice,
});
return txHash;
}
/**
* Withdraw ETH to the withdrawer's address from the wrapped ETH smart contract in exchange for the
* equivalent number of wrapped ETH tokens.
* @param etherTokenAddress EtherToken address you wish to withdraw from.
* @param amountInWei Amount of ETH in Wei the caller wishes to withdraw.
* @param withdrawer The hex encoded user Ethereum address that would like to make the withdrawal.
* @param txOpts Transaction parameters.
* @return Transaction hash.
*/
public async withdrawAsync(
etherTokenAddress: string,
amountInWei: BigNumber,
withdrawer: string,
txOpts: TransactionOpts = {},
): Promise<string> {
assert.isValidBaseUnitAmount('amountInWei', amountInWei);
assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
await assert.isSenderAddressAsync('withdrawer', withdrawer, this._web3Wrapper);
const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
const normalizedWithdrawerAddress = withdrawer.toLowerCase();
const WETHBalanceInBaseUnits = await this._erc20TokenWrapper.getBalanceAsync(
normalizedEtherTokenAddress,
normalizedWithdrawerAddress,
);
assert.assert(
WETHBalanceInBaseUnits.gte(amountInWei),
ContractWrappersError.InsufficientWEthBalanceForWithdrawal,
);
const wethContract = await this._getEtherTokenContractAsync(normalizedEtherTokenAddress);
const txHash = await wethContract.withdraw.sendTransactionAsync(amountInWei, {
from: normalizedWithdrawerAddress,
gas: txOpts.gasLimit,
gasPrice: txOpts.gasPrice,
});
return txHash;
}
/**
* Gets historical logs without creating a subscription
* @param etherTokenAddress An address of the ether token that emitted the logs.
* @param eventName The ether token contract event you would like to subscribe to.
* @param blockRange Block range to get logs from.
* @param indexFilterValues An object where the keys are indexed args returned by the event and
* the value is the value you are interested in. E.g `{_owner: aUserAddressHex}`
* @return Array of logs that match the parameters
*/
public async getLogsAsync<ArgsType extends WETH9EventArgs>(
etherTokenAddress: string,
eventName: WETH9Events,
blockRange: BlockRange,
indexFilterValues: IndexedFilterValues,
): Promise<Array<LogWithDecodedArgs<ArgsType>>> {
assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
assert.doesBelongToStringEnum('eventName', eventName, WETH9Events);
assert.doesConformToSchema('blockRange', blockRange, schemas.blockRangeSchema);
assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
const logs = await this._getLogsAsync<ArgsType>(
normalizedEtherTokenAddress,
eventName,
blockRange,
indexFilterValues,
artifacts.EtherToken.compilerOutput.abi,
);
return logs;
}
/**
* Subscribe to an event type emitted by the Token contract.
* @param etherTokenAddress The hex encoded address where the ether token is deployed.
* @param eventName The ether token contract event you would like to subscribe to.
* @param indexFilterValues An object where the keys are indexed args returned by the event and
* the value is the value you are interested in. E.g `{_owner: aUserAddressHex}`
* @param callback Callback that gets called when a log is added/removed
* @return Subscription token used later to unsubscribe
*/
public subscribe<ArgsType extends WETH9EventArgs>(
etherTokenAddress: string,
eventName: WETH9Events,
indexFilterValues: IndexedFilterValues,
callback: EventCallback<ArgsType>,
): string {
assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
const normalizedEtherTokenAddress = etherTokenAddress.toLowerCase();
assert.doesBelongToStringEnum('eventName', eventName, WETH9Events);
assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
assert.isFunction('callback', callback);
const subscriptionToken = this._subscribe<ArgsType>(
normalizedEtherTokenAddress,
eventName,
indexFilterValues,
artifacts.EtherToken.compilerOutput.abi,
callback,
);
return subscriptionToken;
}
/**
* Cancel a subscription
* @param subscriptionToken Subscription token returned by `subscribe()`
*/
public unsubscribe(subscriptionToken: string): void {
this._unsubscribe(subscriptionToken);
}
/**
* Cancels all existing subscriptions
*/
public unsubscribeAll(): void {
super._unsubscribeAll();
}
/**
* Retrieves the Ethereum address of the EtherToken contract deployed on the network
* that the user-passed web3 provider is connected to. If it's not Kovan, Ropsten, Rinkeby, Mainnet or TestRPC
* (networkId: 50), it will return undefined (e.g a private network).
* @returns The Ethereum address of the EtherToken contract or undefined.
*/
public getContractAddressIfExists(): string | undefined {
const networkSpecificArtifact = artifacts.EtherToken.networks[this._networkId];
const contractAddressIfExists = _.isUndefined(networkSpecificArtifact)
? undefined
: networkSpecificArtifact.address;
return contractAddressIfExists;
}
// tslint:disable-next-line:no-unused-variable
private _invalidateContractInstance(): void {
this.unsubscribeAll();
this._etherTokenContractsByAddress = {};
}
private async _getEtherTokenContractAsync(etherTokenAddress: string): Promise<WETH9Contract> {
let etherTokenContract = this._etherTokenContractsByAddress[etherTokenAddress];
if (!_.isUndefined(etherTokenContract)) {
return etherTokenContract;
}
const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
artifacts.EtherToken,
etherTokenAddress,
);
const contractInstance = new WETH9Contract(
abi,
address,
this._web3Wrapper.getProvider(),
this._web3Wrapper.getContractDefaults(),
);
etherTokenContract = contractInstance;
this._etherTokenContractsByAddress[etherTokenAddress] = etherTokenContract;
return etherTokenContract;
}
}
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