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author | Fabio Berger <me@fabioberger.com> | 2018-05-10 02:36:28 +0800 |
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committer | Fabio Berger <me@fabioberger.com> | 2018-05-10 02:36:28 +0800 |
commit | 209266dbed9d7d038c90c2da8d9b99acab77c80c (patch) | |
tree | cfefd5ab15bc237716b15687629e0f41362a8e86 /packages/order-utils/src/order_state_utils.ts | |
parent | 69a6166b6a1d39afc24b8dd950ec5d8539a03420 (diff) | |
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Split 0x.js into contract-wrappers, order-watcher but keep 0x.js as a unifying library with the same interface
Diffstat (limited to 'packages/order-utils/src/order_state_utils.ts')
-rw-r--r-- | packages/order-utils/src/order_state_utils.ts | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/packages/order-utils/src/order_state_utils.ts b/packages/order-utils/src/order_state_utils.ts new file mode 100644 index 000000000..36171f526 --- /dev/null +++ b/packages/order-utils/src/order_state_utils.ts @@ -0,0 +1,140 @@ +import { + ExchangeContractErrs, + OrderRelevantState, + OrderState, + OrderStateInvalid, + OrderStateValid, + SignedOrder, +} from '@0xproject/types'; +import { BigNumber } from '@0xproject/utils'; +import * as _ from 'lodash'; + +import { AbstractBalanceAndProxyAllowanceFetcher } from './abstract/abstract_balance_and_proxy_allowance_fetcher'; +import { AbstractOrderFilledCancelledFetcher } from './abstract/abstract_order_filled_cancelled_fetcher'; +import { getOrderHashHex } from './order_hash'; +import { RemainingFillableCalculator } from './remaining_fillable_calculator'; + +const ACCEPTABLE_RELATIVE_ROUNDING_ERROR = 0.0001; + +export class OrderStateUtils { + private _balanceAndProxyAllowanceFetcher: AbstractBalanceAndProxyAllowanceFetcher; + private _orderFilledCancelledFetcher: AbstractOrderFilledCancelledFetcher; + private static _validateIfOrderIsValid(signedOrder: SignedOrder, orderRelevantState: OrderRelevantState): void { + const unavailableTakerTokenAmount = orderRelevantState.cancelledTakerTokenAmount.add( + orderRelevantState.filledTakerTokenAmount, + ); + const availableTakerTokenAmount = signedOrder.takerTokenAmount.minus(unavailableTakerTokenAmount); + if (availableTakerTokenAmount.eq(0)) { + throw new Error(ExchangeContractErrs.OrderRemainingFillAmountZero); + } + + if (orderRelevantState.makerBalance.eq(0)) { + throw new Error(ExchangeContractErrs.InsufficientMakerBalance); + } + if (orderRelevantState.makerProxyAllowance.eq(0)) { + throw new Error(ExchangeContractErrs.InsufficientMakerAllowance); + } + if (!signedOrder.makerFee.eq(0)) { + if (orderRelevantState.makerFeeBalance.eq(0)) { + throw new Error(ExchangeContractErrs.InsufficientMakerFeeBalance); + } + if (orderRelevantState.makerFeeProxyAllowance.eq(0)) { + throw new Error(ExchangeContractErrs.InsufficientMakerFeeAllowance); + } + } + const minFillableTakerTokenAmountWithinNoRoundingErrorRange = signedOrder.takerTokenAmount + .dividedBy(ACCEPTABLE_RELATIVE_ROUNDING_ERROR) + .dividedBy(signedOrder.makerTokenAmount); + if ( + orderRelevantState.remainingFillableTakerTokenAmount.lessThan( + minFillableTakerTokenAmountWithinNoRoundingErrorRange, + ) + ) { + throw new Error(ExchangeContractErrs.OrderFillRoundingError); + } + } + constructor( + balanceAndProxyAllowanceFetcher: AbstractBalanceAndProxyAllowanceFetcher, + orderFilledCancelledFetcher: AbstractOrderFilledCancelledFetcher, + ) { + this._balanceAndProxyAllowanceFetcher = balanceAndProxyAllowanceFetcher; + this._orderFilledCancelledFetcher = orderFilledCancelledFetcher; + } + public async getOrderStateAsync(signedOrder: SignedOrder): Promise<OrderState> { + const orderRelevantState = await this.getOrderRelevantStateAsync(signedOrder); + const orderHash = getOrderHashHex(signedOrder); + try { + OrderStateUtils._validateIfOrderIsValid(signedOrder, orderRelevantState); + const orderState: OrderStateValid = { + isValid: true, + orderHash, + orderRelevantState, + }; + return orderState; + } catch (err) { + const orderState: OrderStateInvalid = { + isValid: false, + orderHash, + error: err.message, + }; + return orderState; + } + } + public async getOrderRelevantStateAsync(signedOrder: SignedOrder): Promise<OrderRelevantState> { + const zrxTokenAddress = this._orderFilledCancelledFetcher.getZRXTokenAddress(); + const orderHash = getOrderHashHex(signedOrder); + const makerBalance = await this._balanceAndProxyAllowanceFetcher.getBalanceAsync( + signedOrder.makerTokenAddress, + signedOrder.maker, + ); + const makerProxyAllowance = await this._balanceAndProxyAllowanceFetcher.getProxyAllowanceAsync( + signedOrder.makerTokenAddress, + signedOrder.maker, + ); + const makerFeeBalance = await this._balanceAndProxyAllowanceFetcher.getBalanceAsync( + zrxTokenAddress, + signedOrder.maker, + ); + const makerFeeProxyAllowance = await this._balanceAndProxyAllowanceFetcher.getProxyAllowanceAsync( + zrxTokenAddress, + signedOrder.maker, + ); + const filledTakerTokenAmount = await this._orderFilledCancelledFetcher.getFilledTakerAmountAsync(orderHash); + const cancelledTakerTokenAmount = await this._orderFilledCancelledFetcher.getCancelledTakerAmountAsync( + orderHash, + ); + const unavailableTakerTokenAmount = await this._orderFilledCancelledFetcher.getUnavailableTakerAmountAsync( + orderHash, + ); + const totalMakerTokenAmount = signedOrder.makerTokenAmount; + const totalTakerTokenAmount = signedOrder.takerTokenAmount; + const remainingTakerTokenAmount = totalTakerTokenAmount.minus(unavailableTakerTokenAmount); + const remainingMakerTokenAmount = remainingTakerTokenAmount + .times(totalMakerTokenAmount) + .dividedToIntegerBy(totalTakerTokenAmount); + const transferrableMakerTokenAmount = BigNumber.min([makerProxyAllowance, makerBalance]); + const transferrableFeeTokenAmount = BigNumber.min([makerFeeProxyAllowance, makerFeeBalance]); + + const isMakerTokenZRX = signedOrder.makerTokenAddress === zrxTokenAddress; + const remainingFillableCalculator = new RemainingFillableCalculator( + signedOrder, + isMakerTokenZRX, + transferrableMakerTokenAmount, + transferrableFeeTokenAmount, + remainingMakerTokenAmount, + ); + const remainingFillableMakerTokenAmount = remainingFillableCalculator.computeRemainingMakerFillable(); + const remainingFillableTakerTokenAmount = remainingFillableCalculator.computeRemainingTakerFillable(); + const orderRelevantState = { + makerBalance, + makerProxyAllowance, + makerFeeBalance, + makerFeeProxyAllowance, + filledTakerTokenAmount, + cancelledTakerTokenAmount, + remainingFillableMakerTokenAmount, + remainingFillableTakerTokenAmount, + }; + return orderRelevantState; + } +} |