diff options
Diffstat (limited to 'packages/order-utils/src')
| -rw-r--r-- | packages/order-utils/src/market_utils.ts | 85 |
1 files changed, 55 insertions, 30 deletions
diff --git a/packages/order-utils/src/market_utils.ts b/packages/order-utils/src/market_utils.ts index 710eddf8a..d66448a0b 100644 --- a/packages/order-utils/src/market_utils.ts +++ b/packages/order-utils/src/market_utils.ts @@ -1,5 +1,5 @@ import { schemas } from '@0xproject/json-schemas'; -import { OrderRelevantState, SignedOrder } from '@0xproject/types'; +import { SignedOrder } from '@0xproject/types'; import { BigNumber } from '@0xproject/utils'; import * as _ from 'lodash'; @@ -11,24 +11,33 @@ export const marketUtils = { * Takes an array of orders and returns a subset of those orders that has enough makerAssetAmount (taking into account on-chain balances, * allowances, and partial fills) in order to fill the input makerAssetFillAmount plus slippageBufferAmount. Iterates from first order to last. * Sort the input by ascending rate in order to get the subset of orders that will cost the least ETH. - * @param signedOrders An array of objects that conform to the SignedOrder interface. All orders should specify the same makerAsset. - * All orders should specify WETH as the takerAsset. - * @param orderStates An array of objects corresponding to the signedOrders parameter that each contain on-chain state - * relevant to that order. - * @param makerAssetFillAmount The amount of makerAsset desired to be filled. - * @param slippageBufferAmount An additional amount makerAsset to be covered by the result in case of trade collisions or partial fills. + * @param signedOrders An array of objects that conform to the SignedOrder interface. All orders should specify the same makerAsset. + * All orders should specify WETH as the takerAsset. + * @param remainingFillableMakerAssetAmounts An array of BigNumbers corresponding to the signedOrders parameter. + * You can use OrderStateUtils @0xproject/order-utils to perform blockchain lookups + * for these values. + * @param makerAssetFillAmount The amount of makerAsset desired to be filled. + * @param slippageBufferAmount An additional amount makerAsset to be covered by the result in case of trade collisions or partial fills. * @return Resulting orders and remaining fill amount that could not be covered by the input. */ findOrdersThatCoverMakerAssetFillAmount( signedOrders: SignedOrder[], - orderStates: OrderRelevantState[], + remainingFillableMakerAssetAmounts: BigNumber[], makerAssetFillAmount: BigNumber, slippageBufferAmount: BigNumber = constants.ZERO_AMOUNT, ): { resultOrders: SignedOrder[]; remainingFillAmount: BigNumber } { // type assertions assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema); - assert.isBigNumber('makerAssetFillAmount', makerAssetFillAmount); - assert.isBigNumber('slippageBufferAmount', slippageBufferAmount); + _.forEach(remainingFillableMakerAssetAmounts, (amount, index) => + assert.isValidBaseUnitAmount(`remainingFillableMakerAssetAmount[${index}]`, amount), + ); + assert.isValidBaseUnitAmount('makerAssetFillAmount', makerAssetFillAmount); + assert.isValidBaseUnitAmount('slippageBufferAmount', slippageBufferAmount); + // other assertions + assert.assert( + signedOrders.length === remainingFillableMakerAssetAmounts.length, + 'Expected signedOrders.length to equal remainingFillableMakerAssetAmounts.length', + ); // calculate total amount of makerAsset needed to be filled const totalFillAmount = makerAssetFillAmount.plus(slippageBufferAmount); // iterate through the signedOrders input from left to right until we have enough makerAsset to fill totalFillAmount @@ -38,8 +47,7 @@ export const marketUtils = { if (remainingFillAmount.lessThanOrEqualTo(constants.ZERO_AMOUNT)) { return { resultOrders, remainingFillAmount: constants.ZERO_AMOUNT }; } else { - const orderState = orderStates[index]; - const makerAssetAmountAvailable = orderState.remainingFillableMakerAssetAmount; + const makerAssetAmountAvailable = remainingFillableMakerAssetAmounts[index]; // if there is no makerAssetAmountAvailable do not append order to resultOrders // if we have exceeded the total amount we want to fill set remainingFillAmount to 0 return { @@ -62,47 +70,64 @@ export const marketUtils = { * on-chain balances, allowances, and partial fills) in order to fill the takerFees required by signedOrders plus a * slippageBufferAmount. Iterates from first feeOrder to last. Sort the feeOrders by ascending rate in order to get the subset of * feeOrders that will cost the least ETH. - * @param signedOrders An array of objects that conform to the SignedOrder interface. All orders should specify ZRX as - * the makerAsset and WETH as the takerAsset. - * @param orderStates An array of objects corresponding to the signedOrders parameter that each contain on-chain state - * relevant to that order. - * @param signedFeeOrders An array of objects that conform to the SignedOrder interface. All orders should specify ZRX as - * the makerAsset and WETH as the takerAsset. - * @param feeOrderStates An array of objects corresponding to the signedOrders parameter that each contain on-chain state - * relevant to that order. - * @param makerAssetFillAmount The amount of makerAsset desired to be filled. - * @param slippageBufferAmount An additional amount makerAsset to be covered by the result in case of trade collisions or partial fills. + * @param signedOrders An array of objects that conform to the SignedOrder interface. All orders should specify ZRX as + * the makerAsset and WETH as the takerAsset. + * @param remainingFillableMakerAssetAmounts An array of BigNumbers corresponding to the signedOrders parameter. + * You can use OrderStateUtils @0xproject/order-utils to perform blockchain lookups + * for these values. + * @param signedFeeOrders An array of objects that conform to the SignedOrder interface. All orders should specify ZRX as + * the makerAsset and WETH as the takerAsset. + * @param remainingFillableFeeAmounts An array of BigNumbers corresponding to the signedFeeOrders parameter. + * You can use OrderStateUtils @0xproject/order-utils to perform blockchain lookups + * for these values. + * @param slippageBufferAmount An additional amount makerAsset to be covered by the result in case of trade collisions or partial fills. * @return Resulting orders and remaining fill amount that could not be covered by the input. */ findFeeOrdersThatCoverFeesForTargetOrders( signedOrders: SignedOrder[], - orderStates: OrderRelevantState[], + remainingFillableMakerAssetAmounts: BigNumber[], signedFeeOrders: SignedOrder[], - feeOrderStates: OrderRelevantState[], + remainingFillableFeeAmounts: BigNumber[], slippageBufferAmount: BigNumber = constants.ZERO_AMOUNT, ): { resultOrders: SignedOrder[]; remainingFillAmount: BigNumber } { // type assertions assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema); + _.forEach(remainingFillableMakerAssetAmounts, (amount, index) => + assert.isValidBaseUnitAmount(`remainingFillableMakerAssetAmount[${index}]`, amount), + ); assert.doesConformToSchema('signedFeeOrders', signedFeeOrders, schemas.signedOrdersSchema); - assert.isBigNumber('slippageBufferAmount', slippageBufferAmount); + _.forEach(remainingFillableFeeAmounts, (amount, index) => + assert.isValidBaseUnitAmount(`remainingFillableFeeAmounts[${index}]`, amount), + ); + assert.isValidBaseUnitAmount('slippageBufferAmount', slippageBufferAmount); + // other assertions + assert.assert( + signedOrders.length === remainingFillableMakerAssetAmounts.length, + 'Expected signedOrders.length to equal remainingFillableMakerAssetAmounts.length', + ); + assert.assert( + signedOrders.length === remainingFillableMakerAssetAmounts.length, + 'Expected signedFeeOrders.length to equal remainingFillableFeeAmounts.length', + ); // calculate total amount of ZRX needed to fill signedOrders const totalFeeAmount = _.reduce( signedOrders, (accFees, order, index) => { - const orderState = orderStates[index]; - const makerAssetAmountAvailable = orderState.remainingFillableMakerAssetAmount; + const makerAssetAmountAvailable = remainingFillableMakerAssetAmounts[index]; const feeToFillMakerAssetAmountAvailable = makerAssetAmountAvailable - .div(order.makerAssetAmount) - .mul(order.takerFee); + .mul(order.takerFee) + .div(order.makerAssetAmount); return accFees.plus(feeToFillMakerAssetAmountAvailable); }, constants.ZERO_AMOUNT, ); return marketUtils.findOrdersThatCoverMakerAssetFillAmount( signedFeeOrders, - feeOrderStates, + remainingFillableFeeAmounts, totalFeeAmount, slippageBufferAmount, ); + // TODO: add more orders here to cover rounding + // https://github.com/0xProject/0x-protocol-specification/blob/master/v2/forwarding-contract-specification.md#over-buying-zrx }, }; |