import { SignedOrder } from '@0xproject/types'; import { BigNumber } from '@0xproject/utils'; import { Web3Wrapper } from '@0xproject/web3-wrapper'; import { Provider, TransactionReceiptWithDecodedLogs, TxDataPayable } from 'ethereum-types'; import * as _ from 'lodash'; import { ForwarderContract } from '../../generated_contract_wrappers/forwarder'; import { constants } from './constants'; import { formatters } from './formatters'; import { LogDecoder } from './log_decoder'; import { MarketSellOrders } from './types'; export class ForwarderWrapper { private readonly _web3Wrapper: Web3Wrapper; private readonly _forwarderContract: ForwarderContract; private readonly _logDecoder: LogDecoder; public static getPercentageOfValue(value: BigNumber, percentage: number): BigNumber { const numerator = constants.PERCENTAGE_DENOMINATOR.times(percentage).dividedToIntegerBy(100); const newValue = value.times(numerator).dividedToIntegerBy(constants.PERCENTAGE_DENOMINATOR); return newValue; } public static getWethForFeeOrders(feeAmount: BigNumber, feeOrders: SignedOrder[]): BigNumber { let wethAmount = new BigNumber(0); let remainingFeeAmount = feeAmount; _.forEach(feeOrders, feeOrder => { const feeAvailable = feeOrder.makerAssetAmount.minus(feeOrder.takerFee); if (!remainingFeeAmount.isZero() && feeAvailable.gt(remainingFeeAmount)) { wethAmount = wethAmount .plus(feeOrder.takerAssetAmount.times(remainingFeeAmount).dividedToIntegerBy(feeAvailable)) .plus(1); remainingFeeAmount = new BigNumber(0); } else if (!remainingFeeAmount.isZero()) { wethAmount = wethAmount.plus(feeOrder.takerAssetAmount); remainingFeeAmount = remainingFeeAmount.minus(feeAvailable); } }); return wethAmount; } private static _createOptimizedOrders(signedOrders: SignedOrder[]): MarketSellOrders { _.forEach(signedOrders, (signedOrder, index) => { signedOrder.takerAssetData = constants.NULL_BYTES; if (index > 0) { signedOrder.makerAssetData = constants.NULL_BYTES; } }); const params = formatters.createMarketSellOrders(signedOrders, constants.ZERO_AMOUNT); return params; } private static _createOptimizedZrxOrders(signedOrders: SignedOrder[]): MarketSellOrders { _.forEach(signedOrders, signedOrder => { signedOrder.makerAssetData = constants.NULL_BYTES; signedOrder.takerAssetData = constants.NULL_BYTES; }); const params = formatters.createMarketSellOrders(signedOrders, constants.ZERO_AMOUNT); return params; } constructor(contractInstance: ForwarderContract, provider: Provider) { this._forwarderContract = contractInstance; this._web3Wrapper = new Web3Wrapper(provider); this._logDecoder = new LogDecoder(this._web3Wrapper); } public async marketSellOrdersWithEthAsync( orders: SignedOrder[], feeOrders: SignedOrder[], txData: TxDataPayable, opts: { feePercentage?: BigNumber; feeRecipient?: string } = {}, ): Promise { const params = ForwarderWrapper._createOptimizedOrders(orders); const feeParams = ForwarderWrapper._createOptimizedZrxOrders(feeOrders); const feePercentage = _.isUndefined(opts.feePercentage) ? constants.ZERO_AMOUNT : opts.feePercentage; const feeRecipient = _.isUndefined(opts.feeRecipient) ? constants.NULL_ADDRESS : opts.feeRecipient; const txHash = await this._forwarderContract.marketSellOrdersWithEth.sendTransactionAsync( params.orders, params.signatures, feeParams.orders, feeParams.signatures, feePercentage, feeRecipient, txData, ); const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash); return tx; } public async marketBuyOrdersWithEthAsync( orders: SignedOrder[], feeOrders: SignedOrder[], makerAssetFillAmount: BigNumber, txData: TxDataPayable, opts: { feePercentage?: BigNumber; feeRecipient?: string } = {}, ): Promise { const params = ForwarderWrapper._createOptimizedOrders(orders); const feeParams = ForwarderWrapper._createOptimizedZrxOrders(feeOrders); const feePercentage = _.isUndefined(opts.feePercentage) ? constants.ZERO_AMOUNT : opts.feePercentage; const feeRecipient = _.isUndefined(opts.feeRecipient) ? constants.NULL_ADDRESS : opts.feeRecipient; const txHash = await this._forwarderContract.marketBuyOrdersWithEth.sendTransactionAsync( params.orders, makerAssetFillAmount, params.signatures, feeParams.orders, feeParams.signatures, feePercentage, feeRecipient, txData, ); const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash); return tx; } public async withdrawAssetAsync( assetData: string, amount: BigNumber, txData: TxDataPayable, ): Promise { const txHash = await this._forwarderContract.withdrawAsset.sendTransactionAsync(assetData, amount, txData); const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash); return tx; } }