import * as BigNumber from 'bignumber.js'; import {ZeroEx, Token, SignedOrder} from '../../src'; import {orderFactory} from '../utils/order_factory'; import {constants} from './constants'; export class FillScenarios { private zeroEx: ZeroEx; private userAddresses: string[]; private tokens: Token[]; private coinbase: string; private zrxTokenAddress: string; private exchangeContractAddress: string; constructor(zeroEx: ZeroEx, userAddresses: string[], tokens: Token[], zrxTokenAddress: string, exchangeContractAddress: string) { this.zeroEx = zeroEx; this.userAddresses = userAddresses; this.tokens = tokens; this.coinbase = userAddresses[0]; this.zrxTokenAddress = zrxTokenAddress; this.exchangeContractAddress = exchangeContractAddress; } public async createFillableSignedOrderAsync(makerTokenAddress: string, takerTokenAddress: string, makerAddress: string, takerAddress: string, fillableAmount: BigNumber.BigNumber, expirationUnixTimestampSec?: BigNumber.BigNumber): Promise { return this.createAsymmetricFillableSignedOrderAsync( makerTokenAddress, takerTokenAddress, makerAddress, takerAddress, fillableAmount, fillableAmount, expirationUnixTimestampSec, ); } public async createFillableSignedOrderWithFeesAsync( makerTokenAddress: string, takerTokenAddress: string, makerFee: BigNumber.BigNumber, takerFee: BigNumber.BigNumber, makerAddress: string, takerAddress: string, fillableAmount: BigNumber.BigNumber, feeRecepient: string, expirationUnixTimestampSec?: BigNumber.BigNumber, ): Promise { return this.createAsymmetricFillableSignedOrderWithFeesAsync( makerTokenAddress, takerTokenAddress, makerFee, takerFee, makerAddress, takerAddress, fillableAmount, fillableAmount, feeRecepient, expirationUnixTimestampSec, ); } public async createAsymmetricFillableSignedOrderAsync( makerTokenAddress: string, takerTokenAddress: string, makerAddress: string, takerAddress: string, makerFillableAmount: BigNumber.BigNumber, takerFillableAmount: BigNumber.BigNumber, expirationUnixTimestampSec?: BigNumber.BigNumber): Promise { const makerFee = new BigNumber(0); const takerFee = new BigNumber(0); const feeRecepient = constants.NULL_ADDRESS; return this.createAsymmetricFillableSignedOrderWithFeesAsync( makerTokenAddress, takerTokenAddress, makerFee, takerFee, makerAddress, takerAddress, makerFillableAmount, takerFillableAmount, feeRecepient, expirationUnixTimestampSec, ); } public async createPartiallyFilledSignedOrderAsync(makerTokenAddress: string, takerTokenAddress: string, takerAddress: string, fillableAmount: BigNumber.BigNumber, partialFillAmount: BigNumber.BigNumber) { const [makerAddress] = this.userAddresses; const signedOrder = await this.createAsymmetricFillableSignedOrderAsync( makerTokenAddress, takerTokenAddress, makerAddress, takerAddress, fillableAmount, fillableAmount, ); const shouldThrowOnInsufficientBalanceOrAllowance = false; await this.zeroEx.exchange.fillOrderAsync(signedOrder, partialFillAmount, shouldThrowOnInsufficientBalanceOrAllowance, takerAddress); return signedOrder; } private async createAsymmetricFillableSignedOrderWithFeesAsync( makerTokenAddress: string, takerTokenAddress: string, makerFee: BigNumber.BigNumber, takerFee: BigNumber.BigNumber, makerAddress: string, takerAddress: string, makerFillableAmount: BigNumber.BigNumber, takerFillableAmount: BigNumber.BigNumber, feeRecepient: string, expirationUnixTimestampSec?: BigNumber.BigNumber): Promise { await Promise.all([ this.increaseBalanceAndAllowanceAsync(makerTokenAddress, makerAddress, makerFillableAmount), this.increaseBalanceAndAllowanceAsync(takerTokenAddress, takerAddress, takerFillableAmount), ]); await Promise.all([ this.increaseBalanceAndAllowanceAsync(this.zrxTokenAddress, makerAddress, makerFee), this.increaseBalanceAndAllowanceAsync(this.zrxTokenAddress, takerAddress, takerFee), ]); const signedOrder = await orderFactory.createSignedOrderAsync(this.zeroEx, makerAddress, takerAddress, makerFee, takerFee, makerFillableAmount, makerTokenAddress, takerFillableAmount, takerTokenAddress, this.exchangeContractAddress, feeRecepient, expirationUnixTimestampSec); return signedOrder; } private async increaseBalanceAndAllowanceAsync( tokenAddress: string, address: string, amount: BigNumber.BigNumber): Promise { if (amount.isZero()) { return; // noop } await Promise.all([ this.increaseBalanceAsync(tokenAddress, address, amount), this.increaseAllowanceAsync(tokenAddress, address, amount), ]); } private async increaseBalanceAsync( tokenAddress: string, address: string, amount: BigNumber.BigNumber): Promise { await this.zeroEx.token.transferAsync(tokenAddress, this.coinbase, address, amount); } private async increaseAllowanceAsync( tokenAddress: string, address: string, amount: BigNumber.BigNumber): Promise { const oldMakerAllowance = await this.zeroEx.token.getProxyAllowanceAsync(tokenAddress, address); const newMakerAllowance = oldMakerAllowance.plus(amount); await this.zeroEx.token.setProxyAllowanceAsync( tokenAddress, address, newMakerAllowance, ); } }