diff options
Diffstat (limited to 'src/contract_wrappers/exchange_wrapper.ts')
| -rw-r--r-- | src/contract_wrappers/exchange_wrapper.ts | 75 |
1 files changed, 6 insertions, 69 deletions
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts index 9cc29e286..2ddd63422 100644 --- a/src/contract_wrappers/exchange_wrapper.ts +++ b/src/contract_wrappers/exchange_wrapper.ts @@ -1,7 +1,6 @@ import * as _ from 'lodash'; import * as BigNumber from 'bignumber.js'; import promisify = require('es6-promisify'); -import * as Web3 from 'web3'; import {Web3Wrapper} from '../web3_wrapper'; import { ECSignature, @@ -27,16 +26,12 @@ import { LogErrorContractEventArgs, LogFillContractEventArgs, LogCancelContractEventArgs, - EventCallback, - ContractEventArg, - ExchangeContractByAddress, - ContractArtifact, } from '../types'; import {assert} from '../utils/assert'; import {utils} from '../utils/utils'; import {eventUtils} from '../utils/event_utils'; +import {OrderValidationUtils} from '../utils/order_validation_utils'; import {ContractWrapper} from './contract_wrapper'; -import {ProxyWrapper} from './proxy_wrapper'; import {ecSignatureSchema} from '../schemas/ec_signature_schema'; import {signedOrdersSchema} from '../schemas/signed_orders_schema'; import {subscriptionOptsSchema} from '../schemas/subscription_opts_schema'; @@ -66,6 +61,7 @@ export class ExchangeWrapper extends ContractWrapper { }; private _exchangeContractIfExists?: ExchangeContract; private _exchangeLogEventEmitters: ContractEventEmitter[]; + private _orderValidationUtils: OrderValidationUtils; private _tokenWrapper: TokenWrapper; private static _getOrderAddressesAndValues(order: Order): [OrderAddresses, OrderValues] { const orderAddresses: OrderAddresses = [ @@ -88,6 +84,7 @@ export class ExchangeWrapper extends ContractWrapper { constructor(web3Wrapper: Web3Wrapper, tokenWrapper: TokenWrapper) { super(web3Wrapper); this._tokenWrapper = tokenWrapper; + this._orderValidationUtils = new OrderValidationUtils(tokenWrapper); this._exchangeLogEventEmitters = []; } /** @@ -667,8 +664,9 @@ export class ExchangeWrapper extends ContractWrapper { throw new Error(ExchangeContractErrs.OrderFillExpired); } const zrxTokenAddress = await this._getZRXTokenAddressAsync(signedOrder.exchangeContractAddress); - await this._validateFillOrderBalancesAndAllowancesAndThrowIfInvalidAsync(signedOrder, fillTakerAmount, - senderAddress, zrxTokenAddress); + await this._orderValidationUtils.validateFillOrderBalancesAllowancesThrowIfInvalidAsync( + signedOrder, fillTakerAmount, senderAddress, zrxTokenAddress, + ); const wouldRoundingErrorOccur = await this._isRoundingErrorAsync( signedOrder.takerTokenAmount, fillTakerAmount, signedOrder.makerTokenAmount, @@ -702,67 +700,6 @@ export class ExchangeWrapper extends ContractWrapper { throw new Error(ExchangeContractErrs.InsufficientRemainingFillAmount); } } - /** - * This method does not currently validate the edge-case where the makerToken or takerToken is also the token used - * to pay fees (ZRX). It is possible for them to have enough for fees and the transfer but not both. - * Handling the edge-cases that arise when this happens would require making sure that the user has sufficient - * funds to pay both the fees and the transfer amount. We decided to punt on this for now as the contracts - * will throw for these edge-cases. - * TODO: Throw errors before calling the smart contract for these edge-cases in order to minimize - * the callers gas costs. - */ - private async _validateFillOrderBalancesAndAllowancesAndThrowIfInvalidAsync(signedOrder: SignedOrder, - fillTakerAmount: BigNumber.BigNumber, - senderAddress: string, - zrxTokenAddress: string, - ): Promise<void> { - - const makerBalance = await this._tokenWrapper.getBalanceAsync(signedOrder.makerTokenAddress, - signedOrder.maker); - const takerBalance = await this._tokenWrapper.getBalanceAsync(signedOrder.takerTokenAddress, senderAddress); - const makerAllowance = await this._tokenWrapper.getProxyAllowanceAsync(signedOrder.makerTokenAddress, - signedOrder.maker); - const takerAllowance = await this._tokenWrapper.getProxyAllowanceAsync(signedOrder.takerTokenAddress, - senderAddress); - - // exchangeRate is the price of one maker token denominated in taker tokens - const exchangeRate = signedOrder.takerTokenAmount.div(signedOrder.makerTokenAmount); - const fillMakerAmountInBaseUnits = fillTakerAmount.div(exchangeRate); - - if (fillTakerAmount.greaterThan(takerBalance)) { - throw new Error(ExchangeContractErrs.InsufficientTakerBalance); - } - if (fillTakerAmount.greaterThan(takerAllowance)) { - throw new Error(ExchangeContractErrs.InsufficientTakerAllowance); - } - if (fillMakerAmountInBaseUnits.greaterThan(makerBalance)) { - throw new Error(ExchangeContractErrs.InsufficientMakerBalance); - } - if (fillMakerAmountInBaseUnits.greaterThan(makerAllowance)) { - throw new Error(ExchangeContractErrs.InsufficientMakerAllowance); - } - - const makerFeeBalance = await this._tokenWrapper.getBalanceAsync(zrxTokenAddress, - signedOrder.maker); - const takerFeeBalance = await this._tokenWrapper.getBalanceAsync(zrxTokenAddress, senderAddress); - const makerFeeAllowance = await this._tokenWrapper.getProxyAllowanceAsync(zrxTokenAddress, - signedOrder.maker); - const takerFeeAllowance = await this._tokenWrapper.getProxyAllowanceAsync(zrxTokenAddress, - senderAddress); - - if (signedOrder.takerFee.greaterThan(takerFeeBalance)) { - throw new Error(ExchangeContractErrs.InsufficientTakerFeeBalance); - } - if (signedOrder.takerFee.greaterThan(takerFeeAllowance)) { - throw new Error(ExchangeContractErrs.InsufficientTakerFeeAllowance); - } - if (signedOrder.makerFee.greaterThan(makerFeeBalance)) { - throw new Error(ExchangeContractErrs.InsufficientMakerFeeBalance); - } - if (signedOrder.makerFee.greaterThan(makerFeeAllowance)) { - throw new Error(ExchangeContractErrs.InsufficientMakerFeeAllowance); - } - } private _throwErrorLogsAsErrors(logs: ContractEvent[]): void { const errEvent = _.find(logs, {event: 'LogError'}); if (!_.isUndefined(errEvent)) { |