From c7d89d98f3b6a95f41bcdf4f09aa7aa516a0fa64 Mon Sep 17 00:00:00 2001 From: Leonid Logvinov Date: Mon, 17 Jul 2017 14:43:17 -0700 Subject: Move _validateFillOrderBalancesAndAllowancesAndThrowIfInvalidAsync to orderValidationUtils --- src/contract_wrappers/exchange_wrapper.ts | 67 ++----------------------------- src/utils/order_validation_utils.ts | 66 ++++++++++++++++++++++++++++++ 2 files changed, 70 insertions(+), 63 deletions(-) create mode 100644 src/utils/order_validation_utils.ts diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts index 9cc29e286..8895c5000 100644 --- a/src/contract_wrappers/exchange_wrapper.ts +++ b/src/contract_wrappers/exchange_wrapper.ts @@ -35,6 +35,7 @@ import { 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'; @@ -667,8 +668,9 @@ 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 orderValidationUtils.validateFillOrderBalancesAndAllowancesAndThrowIfInvalidAsync( + signedOrder, fillTakerAmount, senderAddress, zrxTokenAddress, + ); const wouldRoundingErrorOccur = await this._isRoundingErrorAsync( signedOrder.takerTokenAmount, fillTakerAmount, signedOrder.makerTokenAmount, @@ -702,67 +704,6 @@ 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 { - - 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)) { diff --git a/src/utils/order_validation_utils.ts b/src/utils/order_validation_utils.ts new file mode 100644 index 000000000..05c284ac3 --- /dev/null +++ b/src/utils/order_validation_utils.ts @@ -0,0 +1,66 @@ +import {ExchangeContractErrs, SignedOrder} from '../types'; + +export const orderValidationUtils = { + /** + * 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. + */ + async validateFillOrderBalancesAndAllowancesAndThrowIfInvalidAsync( + signedOrder: SignedOrder, fillTakerAmount: BigNumber.BigNumber, senderAddress: string, zrxTokenAddress: string, + ): Promise { + + 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); + + const isMakerTokenZRX = signedOrder.makerTokenAddress === zrxTokenAddress; + const isTakerTokenZRX = signedOrder.takerTokenAddress === zrxTokenAddress; + + 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); + } + }, +}; -- cgit v1.2.3