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import { ForwarderContract } from '@0x/abi-gen-wrappers';
import { Forwarder } from '@0x/contract-artifacts';
import { schemas } from '@0x/json-schemas';
import { SignedOrder } from '@0x/types';
import { BigNumber } from '@0x/utils';
import { Web3Wrapper } from '@0x/web3-wrapper';
import { ContractAbi } from 'ethereum-types';
import * as _ from 'lodash';
import { orderTxOptsSchema } from '../schemas/order_tx_opts_schema';
import { txOptsSchema } from '../schemas/tx_opts_schema';
import { OrderTransactionOpts } from '../types';
import { assert } from '../utils/assert';
import { calldataOptimizationUtils } from '../utils/calldata_optimization_utils';
import { constants } from '../utils/constants';
import { _getDefaultContractAddresses } from '../utils/contract_addresses';
import { decorators } from '../utils/decorators';
import { utils } from '../utils/utils';
import { ContractWrapper } from './contract_wrapper';
/**
* This class includes the functionality related to interacting with the Forwarder contract.
*/
export class ForwarderWrapper extends ContractWrapper {
public abi: ContractAbi = Forwarder.compilerOutput.abi;
public address: string;
public zrxTokenAddress: string;
public etherTokenAddress: string;
private _forwarderContractIfExists?: ForwarderContract;
/**
* Instantiate ForwarderWrapper
* @param web3Wrapper Web3Wrapper instance to use.
* @param networkId Desired networkId.
* @param address The address of the Exchange contract. If undefined, will
* default to the known address corresponding to the networkId.
* @param zrxTokenAddress The address of the ZRXToken contract. If
* undefined, will default to the known address corresponding to the
* networkId.
* @param etherTokenAddress The address of a WETH (Ether token) contract. If
* undefined, will default to the known address corresponding to the
* networkId.
*/
constructor(
web3Wrapper: Web3Wrapper,
networkId: number,
address?: string,
zrxTokenAddress?: string,
etherTokenAddress?: string,
) {
super(web3Wrapper, networkId);
this.address = _.isUndefined(address) ? _getDefaultContractAddresses(networkId).exchange : address;
this.zrxTokenAddress = _.isUndefined(zrxTokenAddress)
? _getDefaultContractAddresses(networkId).zrxToken
: zrxTokenAddress;
this.etherTokenAddress = _.isUndefined(etherTokenAddress)
? _getDefaultContractAddresses(networkId).etherToken
: etherTokenAddress;
}
/**
* Purchases as much of orders' makerAssets as possible by selling up to 95% of transaction's ETH value.
* Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
* 5% of ETH value is reserved for paying fees to order feeRecipients (in ZRX) and forwarding contract feeRecipient (in ETH).
* Any ETH not spent will be refunded to sender.
* @param signedOrders An array of objects that conform to the SignedOrder interface. All orders must specify the same makerAsset.
* All orders must specify WETH as the takerAsset
* @param takerAddress The user Ethereum address who would like to fill this order. Must be available via the supplied
* Provider provided at instantiation.
* @param ethAmount The amount of eth to send with the transaction (in wei).
* @param signedFeeOrders An array of objects that conform to the SignedOrder interface. All orders must specify ZRX as makerAsset and WETH as takerAsset.
* Used to purchase ZRX for primary order fees.
* @param feePercentage The percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
* Defaults to 0.
* @param feeRecipientAddress The address that will receive ETH when signedFeeOrders are filled.
* @param orderTransactionOpts Transaction parameters.
* @return Transaction hash.
*/
@decorators.asyncZeroExErrorHandler
public async marketSellOrdersWithEthAsync(
signedOrders: SignedOrder[],
takerAddress: string,
ethAmount: BigNumber,
signedFeeOrders: SignedOrder[] = [],
feePercentage: number = 0,
feeRecipientAddress: string = constants.NULL_ADDRESS,
orderTransactionOpts: OrderTransactionOpts = { shouldValidate: true },
): Promise<string> {
// type assertions
assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
assert.isBigNumber('ethAmount', ethAmount);
assert.doesConformToSchema('signedFeeOrders', signedFeeOrders, schemas.signedOrdersSchema);
assert.isNumber('feePercentage', feePercentage);
assert.isETHAddressHex('feeRecipientAddress', feeRecipientAddress);
assert.doesConformToSchema('orderTransactionOpts', orderTransactionOpts, orderTxOptsSchema, [txOptsSchema]);
// other assertions
assert.ordersCanBeUsedForForwarderContract(signedOrders, this.etherTokenAddress);
assert.feeOrdersCanBeUsedForForwarderContract(signedFeeOrders, this.zrxTokenAddress, this.etherTokenAddress);
// format feePercentage
const formattedFeePercentage = utils.numberPercentageToEtherTokenAmountPercentage(feePercentage);
// lowercase input addresses
const normalizedTakerAddress = takerAddress.toLowerCase();
const normalizedFeeRecipientAddress = feeRecipientAddress.toLowerCase();
// optimize orders
const optimizedMarketOrders = calldataOptimizationUtils.optimizeForwarderOrders(signedOrders);
const optimizedFeeOrders = calldataOptimizationUtils.optimizeForwarderFeeOrders(signedFeeOrders);
// compile signatures
const signatures = _.map(optimizedMarketOrders, order => order.signature);
const feeSignatures = _.map(optimizedFeeOrders, order => order.signature);
// get contract
const forwarderContractInstance = await this._getForwarderContractAsync();
// validate transaction
if (orderTransactionOpts.shouldValidate) {
await forwarderContractInstance.marketSellOrdersWithEth.callAsync(
optimizedMarketOrders,
signatures,
optimizedFeeOrders,
feeSignatures,
formattedFeePercentage,
normalizedFeeRecipientAddress,
{
value: ethAmount,
from: normalizedTakerAddress,
gas: orderTransactionOpts.gasLimit,
gasPrice: orderTransactionOpts.gasPrice,
},
);
}
// send transaction
const txHash = await forwarderContractInstance.marketSellOrdersWithEth.sendTransactionAsync(
optimizedMarketOrders,
signatures,
optimizedFeeOrders,
feeSignatures,
formattedFeePercentage,
feeRecipientAddress,
{
value: ethAmount,
from: normalizedTakerAddress,
gas: orderTransactionOpts.gasLimit,
gasPrice: orderTransactionOpts.gasPrice,
},
);
return txHash;
}
/**
* Attempt to purchase makerAssetFillAmount of makerAsset by selling ethAmount provided with transaction.
* Any ZRX required to pay fees for primary orders will automatically be purchased by the contract.
* Any ETH not spent will be refunded to sender.
* @param signedOrders An array of objects that conform to the SignedOrder interface. All orders must specify the same makerAsset.
* All orders must specify WETH as the takerAsset
* @param makerAssetFillAmount The amount of the order (in taker asset baseUnits) that you wish to fill.
* @param takerAddress The user Ethereum address who would like to fill this order. Must be available via the supplied
* Provider provided at instantiation.
* @param ethAmount The amount of eth to send with the transaction (in wei).
* @param signedFeeOrders An array of objects that conform to the SignedOrder interface. All orders must specify ZRX as makerAsset and WETH as takerAsset.
* Used to purchase ZRX for primary order fees.
* @param feePercentage The percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
* Defaults to 0.
* @param feeRecipientAddress The address that will receive ETH when signedFeeOrders are filled.
* @param orderTransactionOpts Transaction parameters.
* @return Transaction hash.
*/
@decorators.asyncZeroExErrorHandler
public async marketBuyOrdersWithEthAsync(
signedOrders: SignedOrder[],
makerAssetFillAmount: BigNumber,
takerAddress: string,
ethAmount: BigNumber,
signedFeeOrders: SignedOrder[] = [],
feePercentage: number = 0,
feeRecipientAddress: string = constants.NULL_ADDRESS,
orderTransactionOpts: OrderTransactionOpts = { shouldValidate: true },
): Promise<string> {
// type assertions
assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
assert.isBigNumber('makerAssetFillAmount', makerAssetFillAmount);
await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
assert.isBigNumber('ethAmount', ethAmount);
assert.doesConformToSchema('signedFeeOrders', signedFeeOrders, schemas.signedOrdersSchema);
assert.isNumber('feePercentage', feePercentage);
assert.isETHAddressHex('feeRecipientAddress', feeRecipientAddress);
assert.doesConformToSchema('orderTransactionOpts', orderTransactionOpts, orderTxOptsSchema, [txOptsSchema]);
// other assertions
assert.ordersCanBeUsedForForwarderContract(signedOrders, this.etherTokenAddress);
assert.feeOrdersCanBeUsedForForwarderContract(signedFeeOrders, this.zrxTokenAddress, this.etherTokenAddress);
// format feePercentage
const formattedFeePercentage = utils.numberPercentageToEtherTokenAmountPercentage(feePercentage);
// lowercase input addresses
const normalizedTakerAddress = takerAddress.toLowerCase();
const normalizedFeeRecipientAddress = feeRecipientAddress.toLowerCase();
// optimize orders
const optimizedMarketOrders = calldataOptimizationUtils.optimizeForwarderOrders(signedOrders);
const optimizedFeeOrders = calldataOptimizationUtils.optimizeForwarderFeeOrders(signedFeeOrders);
// compile signatures
const signatures = _.map(optimizedMarketOrders, order => order.signature);
const feeSignatures = _.map(optimizedFeeOrders, order => order.signature);
// get contract
const forwarderContractInstance = await this._getForwarderContractAsync();
// validate transaction
if (orderTransactionOpts.shouldValidate) {
await forwarderContractInstance.marketBuyOrdersWithEth.callAsync(
optimizedMarketOrders,
makerAssetFillAmount,
signatures,
optimizedFeeOrders,
feeSignatures,
formattedFeePercentage,
normalizedFeeRecipientAddress,
{
value: ethAmount,
from: normalizedTakerAddress,
gas: orderTransactionOpts.gasLimit,
gasPrice: orderTransactionOpts.gasPrice,
},
);
}
// send transaction
const txHash = await forwarderContractInstance.marketBuyOrdersWithEth.sendTransactionAsync(
optimizedMarketOrders,
makerAssetFillAmount,
signatures,
optimizedFeeOrders,
feeSignatures,
formattedFeePercentage,
feeRecipientAddress,
{
value: ethAmount,
from: normalizedTakerAddress,
gas: orderTransactionOpts.gasLimit,
gasPrice: orderTransactionOpts.gasPrice,
},
);
return txHash;
}
private async _getForwarderContractAsync(): Promise<ForwarderContract> {
if (!_.isUndefined(this._forwarderContractIfExists)) {
return this._forwarderContractIfExists;
}
const contractInstance = new ForwarderContract(
this.abi,
this.address,
this._web3Wrapper.getProvider(),
this._web3Wrapper.getContractDefaults(),
);
this._forwarderContractIfExists = contractInstance;
return this._forwarderContractIfExists;
}
}
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