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-rw-r--r--packages/asset-buyer/src/utils/buy_quote_calculator.ts10
-rw-r--r--packages/asset-buyer/src/utils/order_utils.ts14
2 files changed, 16 insertions, 8 deletions
diff --git a/packages/asset-buyer/src/utils/buy_quote_calculator.ts b/packages/asset-buyer/src/utils/buy_quote_calculator.ts
index 31823cc02..aa7159e6c 100644
--- a/packages/asset-buyer/src/utils/buy_quote_calculator.ts
+++ b/packages/asset-buyer/src/utils/buy_quote_calculator.ts
@@ -3,6 +3,7 @@ import { BigNumber } from '@0xproject/utils';
import * as _ from 'lodash';
import { constants } from '../constants';
+import { orderUtils } from './order_utils';
import { AssetBuyerError, AssetBuyerOrdersAndFillableAmounts, BuyQuote } from '../types';
export const buyQuoteCalculator = {
@@ -30,7 +31,7 @@ export const buyQuoteCalculator = {
if (remainingFillAmount.gt(constants.ZERO_AMOUNT)) {
throw new Error(AssetBuyerError.InsufficientAssetLiquidity);
}
- // TODO: optimization
+ // TODO(bmillman): optimization
// update this logic to find the minimum amount of feeOrders to cover the worst case as opposed to
// finding order that cover all fees, this will help with estimating ETH and minimizing gas usage
const {
@@ -59,10 +60,11 @@ export const buyQuoteCalculator = {
let maxEthAmount = constants.ZERO_AMOUNT;
let cumulativeMakerAmount = constants.ZERO_AMOUNT;
_.forEach(allOrders, (order, index) => {
- // TODO: Move this logic to order_utils
const remainingFillableMakerAssetAmount = allRemainingAmounts[index];
- const orderRate = order.takerAssetAmount.div(order.makerAssetAmount);
- const claimableTakerAssetAmount = orderRate.mul(remainingFillableMakerAssetAmount);
+ const claimableTakerAssetAmount = orderUtils.calculateRemainingTakerAssetAmount(
+ order,
+ remainingFillableMakerAssetAmount,
+ );
// taker asset is always assumed to be WETH
maxEthAmount = maxEthAmount.plus(claimableTakerAssetAmount);
if (cumulativeMakerAmount.lessThan(assetBuyAmount)) {
diff --git a/packages/asset-buyer/src/utils/order_utils.ts b/packages/asset-buyer/src/utils/order_utils.ts
index bb0bdb80f..27db73257 100644
--- a/packages/asset-buyer/src/utils/order_utils.ts
+++ b/packages/asset-buyer/src/utils/order_utils.ts
@@ -10,10 +10,16 @@ export const orderUtils = {
return order.expirationTimeSeconds.lessThan(currentUnixTimestampSec);
},
calculateRemainingMakerAssetAmount(order: SignedOrder, remainingTakerAssetAmount: BigNumber): BigNumber {
- const result = remainingTakerAssetAmount.eq(0)
- ? constants.ZERO_AMOUNT
- : remainingTakerAssetAmount.times(order.makerAssetAmount).dividedToIntegerBy(order.takerAssetAmount);
- return result;
+ if (remainingTakerAssetAmount.eq(0)) {
+ return constants.ZERO_AMOUNT;
+ }
+ return remainingTakerAssetAmount.times(order.makerAssetAmount).dividedToIntegerBy(order.takerAssetAmount);
+ },
+ calculateRemainingTakerAssetAmount(order: SignedOrder, remainingMakerAssetAmount: BigNumber): BigNumber {
+ if (remainingMakerAssetAmount.eq(0)) {
+ return constants.ZERO_AMOUNT;
+ }
+ return remainingMakerAssetAmount.times(order.takerAssetAmount).dividedToIntegerBy(order.makerAssetAmount);
},
isOpenOrder(order: SignedOrder): boolean {
return order.takerAddress === constants.NULL_ADDRESS;