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-rw-r--r--packages/order-utils/CHANGELOG.json4
-rw-r--r--packages/order-utils/src/index.ts2
-rw-r--r--packages/order-utils/src/rate_utils.ts48
-rw-r--r--packages/order-utils/src/sorting_utils.ts54
-rw-r--r--packages/order-utils/test/rate_utils_test.ts55
-rw-r--r--packages/order-utils/test/sorting_utils_test.ts67
6 files changed, 230 insertions, 0 deletions
diff --git a/packages/order-utils/CHANGELOG.json b/packages/order-utils/CHANGELOG.json
index a81eb077d..a2dcf13c4 100644
--- a/packages/order-utils/CHANGELOG.json
+++ b/packages/order-utils/CHANGELOG.json
@@ -18,6 +18,10 @@
},
{
"note": "Dependencies updated"
+ },
+ {
+ "note": "Added rateUtils and sortingUtils",
+ "pr": 953
}
],
"timestamp": 1534210131
diff --git a/packages/order-utils/src/index.ts b/packages/order-utils/src/index.ts
index 681fbc904..2b1c92973 100644
--- a/packages/order-utils/src/index.ts
+++ b/packages/order-utils/src/index.ts
@@ -25,3 +25,5 @@ export { EIP712Utils } from './eip712_utils';
export { OrderValidationUtils } from './order_validation_utils';
export { ExchangeTransferSimulator } from './exchange_transfer_simulator';
export { marketUtils } from './market_utils';
+export { rateUtils } from './rate_utils';
+export { sortingUtils } from './sorting_utils';
diff --git a/packages/order-utils/src/rate_utils.ts b/packages/order-utils/src/rate_utils.ts
new file mode 100644
index 000000000..c9ca72c59
--- /dev/null
+++ b/packages/order-utils/src/rate_utils.ts
@@ -0,0 +1,48 @@
+import { schemas } from '@0xproject/json-schemas';
+import { Order } from '@0xproject/types';
+import { BigNumber } from '@0xproject/utils';
+
+import { assert } from './assert';
+import { constants } from './constants';
+
+export const rateUtils = {
+ /**
+ * Takes an order and calculates the fee adjusted rate (takerAsset/makerAsset) by calculating how much takerAsset
+ * is required to cover the fees (feeRate * takerFee), adding the takerAssetAmount and dividing by makerAssetAmount
+ * @param order An object that conforms to the order interface
+ * @param feeRate The market rate of ZRX denominated in takerAssetAmount
+ * (ex. feeRate is 0.1 takerAsset/ZRX if it takes 1 unit of takerAsset to buy 10 ZRX)
+ * Defaults to 0
+ * @return The rate (takerAsset/makerAsset) of the order adjusted for fees
+ */
+ getFeeAdjustedRateOfOrder(order: Order, feeRate: BigNumber = constants.ZERO_AMOUNT): BigNumber {
+ assert.doesConformToSchema('order', order, schemas.orderSchema);
+ assert.isBigNumber('feeRate', feeRate);
+ assert.assert(
+ feeRate.gte(constants.ZERO_AMOUNT),
+ `Expected feeRate: ${feeRate} to be greater than or equal to 0`,
+ );
+ const takerAssetAmountNeededToPayForFees = order.takerFee.mul(feeRate);
+ const totalTakerAssetAmount = takerAssetAmountNeededToPayForFees.plus(order.takerAssetAmount);
+ const rate = totalTakerAssetAmount.div(order.makerAssetAmount);
+ return rate;
+ },
+ /**
+ * Takes a fee order (makerAssetData corresponds to ZRX and takerAssetData corresponds to WETH) and calculates
+ * the fee adjusted rate (WETH/ZRX) by dividing the takerAssetAmount by the makerAmount minus the takerFee
+ * @param feeOrder An object that conforms to the order interface
+ * @return The rate (WETH/ZRX) of the fee order adjusted for fees
+ */
+ getFeeAdjustedRateOfFeeOrder(feeOrder: Order): BigNumber {
+ assert.doesConformToSchema('feeOrder', feeOrder, schemas.orderSchema);
+ const zrxAmountAfterFees = feeOrder.makerAssetAmount.sub(feeOrder.takerFee);
+ assert.assert(
+ zrxAmountAfterFees.greaterThan(constants.ZERO_AMOUNT),
+ `Expected takerFee: ${JSON.stringify(feeOrder.takerFee)} to be less than makerAssetAmount: ${JSON.stringify(
+ feeOrder.makerAssetAmount,
+ )}`,
+ );
+ const rate = feeOrder.takerAssetAmount.div(zrxAmountAfterFees);
+ return rate;
+ },
+};
diff --git a/packages/order-utils/src/sorting_utils.ts b/packages/order-utils/src/sorting_utils.ts
new file mode 100644
index 000000000..8811bcaf8
--- /dev/null
+++ b/packages/order-utils/src/sorting_utils.ts
@@ -0,0 +1,54 @@
+import { schemas } from '@0xproject/json-schemas';
+import { Order } from '@0xproject/types';
+import { BigNumber } from '@0xproject/utils';
+import * as _ from 'lodash';
+
+import { assert } from './assert';
+import { constants } from './constants';
+import { rateUtils } from './rate_utils';
+
+export const sortingUtils = {
+ /**
+ * Takes an array of orders and sorts them by takerAsset/makerAsset rate in ascending order (best rate first).
+ * Adjusts the rate of each order according to the feeRate and takerFee for that order.
+ * @param orders An array of objects that extend the Order interface. All orders should specify ZRX as
+ * the makerAsset and WETH as the takerAsset.
+ * @param feeRate The market rate of ZRX denominated in takerAssetAmount
+ * (ex. feeRate is 0.1 takerAsset/ZRX if it takes 1 unit of takerAsset to buy 10 ZRX)
+ * Defaults to 0
+ * @return The input orders sorted by rate in ascending order
+ */
+ sortOrdersByFeeAdjustedRate<T extends Order>(orders: T[], feeRate: BigNumber = constants.ZERO_AMOUNT): T[] {
+ assert.doesConformToSchema('orders', orders, schemas.ordersSchema);
+ assert.isBigNumber('feeRate', feeRate);
+ const rateCalculator = (order: Order) => rateUtils.getFeeAdjustedRateOfOrder(order, feeRate);
+ const sortedOrders = sortOrders(orders, rateCalculator);
+ return sortedOrders;
+ },
+ /**
+ * Takes an array of fee orders (makerAssetData corresponds to ZRX and takerAssetData corresponds to WETH)
+ * and sorts them by rate in ascending order (best rate first). Adjusts the rate according to the takerFee.
+ * @param feeOrders An array of objects that extend the Order interface. All orders should specify ZRX as
+ * the makerAsset and WETH as the takerAsset.
+ * @return The input orders sorted by rate in ascending order
+ */
+ sortFeeOrdersByFeeAdjustedRate(feeOrders: Order[]): Order[] {
+ assert.doesConformToSchema('feeOrders', feeOrders, schemas.ordersSchema);
+ const rateCalculator = rateUtils.getFeeAdjustedRateOfFeeOrder.bind(rateUtils);
+ const sortedOrders = sortOrders(feeOrders, rateCalculator);
+ return sortedOrders;
+ },
+};
+
+type RateCalculator = (order: Order) => BigNumber;
+
+// takes an array of orders, copies them, and sorts the copy based on the rate definition provided by rateCalculator
+function sortOrders<T extends Order>(orders: T[], rateCalculator: RateCalculator): T[] {
+ const copiedOrders = _.cloneDeep(orders);
+ copiedOrders.sort((firstOrder, secondOrder) => {
+ const firstOrderRate = rateCalculator(firstOrder);
+ const secondOrderRate = rateCalculator(secondOrder);
+ return firstOrderRate.comparedTo(secondOrderRate);
+ });
+ return copiedOrders;
+}
diff --git a/packages/order-utils/test/rate_utils_test.ts b/packages/order-utils/test/rate_utils_test.ts
new file mode 100644
index 000000000..2e299c209
--- /dev/null
+++ b/packages/order-utils/test/rate_utils_test.ts
@@ -0,0 +1,55 @@
+import { BigNumber } from '@0xproject/utils';
+import * as chai from 'chai';
+import 'mocha';
+
+import { rateUtils } from '../src';
+
+import { chaiSetup } from './utils/chai_setup';
+import { testOrderFactory } from './utils/test_order_factory';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('rateUtils', () => {
+ const testOrder = testOrderFactory.generateTestSignedOrder({
+ makerAssetAmount: new BigNumber(100),
+ takerAssetAmount: new BigNumber(100),
+ takerFee: new BigNumber(20),
+ });
+ describe('#getFeeAdjustedRateOfOrder', () => {
+ it('throws when feeRate is less than zero', async () => {
+ const feeRate = new BigNumber(-1);
+ expect(() => rateUtils.getFeeAdjustedRateOfOrder(testOrder, feeRate)).to.throw(
+ 'Expected feeRate: -1 to be greater than or equal to 0',
+ );
+ });
+ it('correctly calculates fee adjusted rate when feeRate is provided', async () => {
+ const feeRate = new BigNumber(2); // ZRX costs 2 units of takerAsset per 1 unit of ZRX
+ const feeAdjustedRate = rateUtils.getFeeAdjustedRateOfOrder(testOrder, feeRate);
+ // the order actually takes 100 + (2 * 20) takerAsset units to fill 100 units of makerAsset
+ expect(feeAdjustedRate).to.bignumber.equal(new BigNumber(1.4));
+ });
+ it('correctly calculates fee adjusted rate when no feeRate is provided', async () => {
+ const feeAdjustedRate = rateUtils.getFeeAdjustedRateOfOrder(testOrder);
+ // because no feeRate was provided we just assume 0 fees
+ // the order actually takes 100 takerAsset units to fill 100 units of makerAsset
+ expect(feeAdjustedRate).to.bignumber.equal(new BigNumber(1));
+ });
+ });
+ describe('#getFeeAdjustedRateOfFeeOrder', () => {
+ it('throws when takerFee exceeds makerAssetAmount', async () => {
+ const badOrder = testOrderFactory.generateTestSignedOrder({
+ makerAssetAmount: new BigNumber(100),
+ takerFee: new BigNumber(101),
+ });
+ expect(() => rateUtils.getFeeAdjustedRateOfFeeOrder(badOrder)).to.throw(
+ 'Expected takerFee: "101" to be less than makerAssetAmount: "100"',
+ );
+ });
+ it('correctly calculates fee adjusted rate', async () => {
+ const feeAdjustedRate = rateUtils.getFeeAdjustedRateOfFeeOrder(testOrder);
+ // the order actually takes 100 takerAsset units to fill (100 - 20) units of makerAsset
+ expect(feeAdjustedRate).to.bignumber.equal(new BigNumber(1.25));
+ });
+ });
+});
diff --git a/packages/order-utils/test/sorting_utils_test.ts b/packages/order-utils/test/sorting_utils_test.ts
new file mode 100644
index 000000000..016432505
--- /dev/null
+++ b/packages/order-utils/test/sorting_utils_test.ts
@@ -0,0 +1,67 @@
+import { BigNumber } from '@0xproject/utils';
+import * as chai from 'chai';
+import 'mocha';
+
+import { sortingUtils } from '../src';
+
+import { chaiSetup } from './utils/chai_setup';
+import { testOrderFactory } from './utils/test_order_factory';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('sortingUtils', () => {
+ describe('#sortOrdersByFeeAdjustedRate', () => {
+ const feeRate = new BigNumber(1); // ZRX costs 1 unit of takerAsset per 1 unit of ZRX
+ // rate: 2 takerAsset / makerAsset
+ const testOrder1 = testOrderFactory.generateTestSignedOrder({
+ makerAssetAmount: new BigNumber(100),
+ takerAssetAmount: new BigNumber(200),
+ });
+ // rate: 1 takerAsset / makerAsset
+ const testOrder2 = testOrderFactory.generateTestSignedOrder({
+ makerAssetAmount: new BigNumber(100),
+ takerAssetAmount: new BigNumber(100),
+ });
+ // rate: 2.5 takerAsset / makerAsset
+ const testOrder3 = testOrderFactory.generateTestSignedOrder({
+ makerAssetAmount: new BigNumber(100),
+ takerAssetAmount: new BigNumber(200),
+ takerFee: new BigNumber(50),
+ });
+ it('correctly sorts by fee adjusted rate when feeRate is Provided', async () => {
+ const orders = [testOrder1, testOrder2, testOrder3];
+ const sortedOrders = sortingUtils.sortOrdersByFeeAdjustedRate(orders, feeRate);
+ expect(sortedOrders).to.deep.equal([testOrder2, testOrder1, testOrder3]);
+ });
+ it('correctly sorts by fee adjusted rate when no feeRate is Provided', async () => {
+ const orders = [testOrder1, testOrder2, testOrder3];
+ const sortedOrders = sortingUtils.sortOrdersByFeeAdjustedRate(orders);
+ expect(sortedOrders).to.deep.equal([testOrder2, testOrder1, testOrder3]);
+ });
+ });
+ describe('#sortFeeOrdersByFeeAdjustedRate', () => {
+ // rate: 200 takerAsset / makerAsset
+ const testOrder1 = testOrderFactory.generateTestSignedOrder({
+ makerAssetAmount: new BigNumber(100),
+ takerAssetAmount: new BigNumber(200),
+ takerFee: new BigNumber(99),
+ });
+ // rate: 1 takerAsset / makerAsset
+ const testOrder2 = testOrderFactory.generateTestSignedOrder({
+ makerAssetAmount: new BigNumber(100),
+ takerAssetAmount: new BigNumber(100),
+ });
+ // rate: 4 takerAsset / makerAsset
+ const testOrder3 = testOrderFactory.generateTestSignedOrder({
+ makerAssetAmount: new BigNumber(100),
+ takerAssetAmount: new BigNumber(200),
+ takerFee: new BigNumber(50),
+ });
+ it('correctly sorts by fee adjusted rate', async () => {
+ const orders = [testOrder1, testOrder2, testOrder3];
+ const sortedOrders = sortingUtils.sortFeeOrdersByFeeAdjustedRate(orders);
+ expect(sortedOrders).to.deep.equal([testOrder2, testOrder3, testOrder1]);
+ });
+ });
+});
generated by cgit (git 2.34.1) at 2024-11-20 14:39:45 +0800