@xspswap/smart-order-router
Version:
XSwap Protocol V3 Smart Order Router
336 lines • 34.5 kB
JavaScript
import { BigNumber } from '@ethersproject/bignumber';
import { Protocol } from '@x-swap-protocol/router-sdk';
import { TradeType } from '@x-swap-protocol/sdk-core';
import JSBI from 'jsbi';
import _ from 'lodash';
import FixedReverseHeap from 'mnemonist/fixed-reverse-heap';
import Queue from 'mnemonist/queue';
import { CurrencyAmount } from '../../../util/amounts';
import { log } from '../../../util/log';
import { metric, MetricLoggerUnit } from '../../../util/metric';
import { routeAmountsToString, routeToString } from '../../../util/routes';
import { usdGasTokensByChain } from '../gas-models';
export async function getBestSwapRoute(amount, percents, routesWithValidQuotes, routeType, chainId, routingConfig, gasModel) {
const now = Date.now();
const { forceMixedRoutes } = routingConfig;
/// Like with forceCrossProtocol, we apply that logic here when determining the bestSwapRoute
if (forceMixedRoutes) {
log.info({
forceMixedRoutes: forceMixedRoutes,
}, 'Forcing mixed routes by filtering out other route types');
routesWithValidQuotes = _.filter(routesWithValidQuotes, (quotes) => {
return quotes.protocol === Protocol.MIXED;
});
if (!routesWithValidQuotes) {
return null;
}
}
// Build a map of percentage of the input to list of valid quotes.
// Quotes can be null for a variety of reasons (not enough liquidity etc), so we drop them here too.
const percentToQuotes = {};
for (const routeWithValidQuote of routesWithValidQuotes) {
if (!percentToQuotes[routeWithValidQuote.percent]) {
percentToQuotes[routeWithValidQuote.percent] = [];
}
percentToQuotes[routeWithValidQuote.percent].push(routeWithValidQuote);
}
metric.putMetric('BuildRouteWithValidQuoteObjects', Date.now() - now, MetricLoggerUnit.Milliseconds);
// Given all the valid quotes for each percentage find the optimal route.
const swapRoute = await getBestSwapRouteBy(routeType, percentToQuotes, percents, chainId, (rq) => rq.quoteAdjustedForGas, routingConfig, gasModel);
// It is possible we were unable to find any valid route given the quotes.
if (!swapRoute) {
return null;
}
// Due to potential loss of precision when taking percentages of the input it is possible that the sum of the amounts of each
// route of our optimal quote may not add up exactly to exactIn or exactOut.
//
// We check this here, and if there is a mismatch
// add the missing amount to a random route. The missing amount size should be neglible so the quote should still be highly accurate.
const { routes: routeAmounts } = swapRoute;
const totalAmount = _.reduce(routeAmounts, (total, routeAmount) => total.add(routeAmount.amount), CurrencyAmount.fromRawAmount(routeAmounts[0].amount.currency, 0));
const missingAmount = amount.subtract(totalAmount);
if (missingAmount.greaterThan(0)) {
log.info({
missingAmount: missingAmount.quotient.toString(),
}, `Optimal route's amounts did not equal exactIn/exactOut total. Adding missing amount to last route in array.`);
routeAmounts[routeAmounts.length - 1].amount =
routeAmounts[routeAmounts.length - 1].amount.add(missingAmount);
}
log.info({
routes: routeAmountsToString(routeAmounts),
numSplits: routeAmounts.length,
amount: amount.toExact(),
quote: swapRoute.quote.toExact(),
quoteGasAdjusted: swapRoute.quoteGasAdjusted.toFixed(Math.min(swapRoute.quoteGasAdjusted.currency.decimals, 2)),
estimatedGasUSD: swapRoute.estimatedGasUsedUSD.toFixed(Math.min(swapRoute.estimatedGasUsedUSD.currency.decimals, 2)),
estimatedGasToken: swapRoute.estimatedGasUsedQuoteToken.toFixed(Math.min(swapRoute.estimatedGasUsedQuoteToken.currency.decimals, 2)),
}, `Found best swap route. ${routeAmounts.length} split.`);
return swapRoute;
}
export async function getBestSwapRouteBy(routeType, percentToQuotes, percents, chainId, by, routingConfig,
// @ts-ignore
gasModel) {
var _a;
// Build a map of percentage to sorted list of quotes, with the biggest quote being first in the list.
const percentToSortedQuotes = _.mapValues(percentToQuotes, (routeQuotes) => {
return routeQuotes.sort((routeQuoteA, routeQuoteB) => {
if (routeType == TradeType.EXACT_INPUT) {
return by(routeQuoteA).greaterThan(by(routeQuoteB)) ? -1 : 1;
}
else {
return by(routeQuoteA).lessThan(by(routeQuoteB)) ? -1 : 1;
}
});
});
const quoteCompFn = routeType == TradeType.EXACT_INPUT
? (a, b) => a.greaterThan(b)
: (a, b) => a.lessThan(b);
const sumFn = (currencyAmounts) => {
let sum = currencyAmounts[0];
for (let i = 1; i < currencyAmounts.length; i++) {
sum = sum.add(currencyAmounts[i]);
}
return sum;
};
let bestQuote;
let bestSwap;
// Min-heap for tracking the 5 best swaps given some number of splits.
const bestSwapsPerSplit = new FixedReverseHeap(Array, (a, b) => {
return quoteCompFn(a.quote, b.quote) ? -1 : 1;
}, 3);
const { minSplits, maxSplits, forceCrossProtocol } = routingConfig;
if (!percentToSortedQuotes[100] || minSplits > 1 || forceCrossProtocol) {
log.info({
percentToSortedQuotes: _.mapValues(percentToSortedQuotes, (p) => p.length),
}, 'Did not find a valid route without any splits. Continuing search anyway.');
}
else {
bestQuote = by(percentToSortedQuotes[100][0]);
bestSwap = [percentToSortedQuotes[100][0]];
for (const routeWithQuote of percentToSortedQuotes[100].slice(0, 5)) {
bestSwapsPerSplit.push({
quote: by(routeWithQuote),
routes: [routeWithQuote],
});
}
}
// We do a BFS. Each additional node in a path represents us adding an additional split to the route.
const queue = new Queue();
// First we seed BFS queue with the best quotes for each percentage.
// i.e. [best quote when sending 10% of amount, best quote when sending 20% of amount, ...]
// We will explore the various combinations from each node.
for (let i = percents.length; i >= 0; i--) {
const percent = percents[i];
if (!percentToSortedQuotes[percent]) {
continue;
}
queue.enqueue({
curRoutes: [percentToSortedQuotes[percent][0]],
percentIndex: i,
remainingPercent: 100 - percent,
special: false,
});
if (!percentToSortedQuotes[percent] ||
!percentToSortedQuotes[percent][1]) {
continue;
}
queue.enqueue({
curRoutes: [percentToSortedQuotes[percent][1]],
percentIndex: i,
remainingPercent: 100 - percent,
special: true,
});
}
let splits = 1;
let startedSplit = Date.now();
while (queue.size > 0) {
metric.putMetric(`Split${splits}Done`, Date.now() - startedSplit, MetricLoggerUnit.Milliseconds);
startedSplit = Date.now();
log.info({
top5: _.map(Array.from(bestSwapsPerSplit.consume()), (q) => `${q.quote.toExact()} (${_(q.routes)
.map((r) => r.toString())
.join(', ')})`),
onQueue: queue.size,
}, `Top 3 with ${splits} splits`);
bestSwapsPerSplit.clear();
// Size of the queue at this point is the number of potential routes we are investigating for the given number of splits.
let layer = queue.size;
splits++;
// If we didn't improve our quote by adding another split, very unlikely to improve it by splitting more after that.
if (splits >= 3 && bestSwap && bestSwap.length < splits - 1) {
break;
}
if (splits > maxSplits) {
log.info('Max splits reached. Stopping search.');
metric.putMetric(`MaxSplitsHitReached`, 1, MetricLoggerUnit.Count);
break;
}
while (layer > 0) {
layer--;
const { remainingPercent, curRoutes, percentIndex, special } = queue.dequeue();
// For all other percentages, add a new potential route.
// E.g. if our current aggregated route if missing 50%, we will create new nodes and add to the queue for:
// 50% + new 10% route, 50% + new 20% route, etc.
for (let i = percentIndex; i >= 0; i--) {
const percentA = percents[i];
if (percentA > remainingPercent) {
continue;
}
// At some point the amount * percentage is so small that the quoter is unable to get
// a quote. In this case there could be no quotes for that percentage.
if (!percentToSortedQuotes[percentA]) {
continue;
}
const candidateRoutesA = percentToSortedQuotes[percentA];
// Find the best route in the complimentary percentage that doesn't re-use a pool already
// used in the current route. Re-using pools is not allowed as each swap through a pool changes its liquidity,
// so it would make the quotes inaccurate.
const routeWithQuoteA = findFirstRouteNotUsingUsedPools(curRoutes, candidateRoutesA, forceCrossProtocol);
if (!routeWithQuoteA) {
continue;
}
const remainingPercentNew = remainingPercent - percentA;
const curRoutesNew = [...curRoutes, routeWithQuoteA];
// If we've found a route combination that uses all 100%, and it has at least minSplits, update our best route.
if (remainingPercentNew == 0 && splits >= minSplits) {
const quotesNew = _.map(curRoutesNew, (r) => by(r));
const quoteNew = sumFn(quotesNew);
let gasCostL1QuoteToken = CurrencyAmount.fromRawAmount(quoteNew.currency, 0);
const quoteAfterL1Adjust = routeType == TradeType.EXACT_INPUT
? quoteNew.subtract(gasCostL1QuoteToken)
: quoteNew.add(gasCostL1QuoteToken);
bestSwapsPerSplit.push({
quote: quoteAfterL1Adjust,
routes: curRoutesNew,
});
if (!bestQuote || quoteCompFn(quoteAfterL1Adjust, bestQuote)) {
bestQuote = quoteAfterL1Adjust;
bestSwap = curRoutesNew;
// Temporary experiment.
if (special) {
metric.putMetric(`BestSwapNotPickingBestForPercent`, 1, MetricLoggerUnit.Count);
}
}
}
else {
queue.enqueue({
curRoutes: curRoutesNew,
remainingPercent: remainingPercentNew,
percentIndex: i,
special,
});
}
}
}
}
if (!bestSwap) {
log.info(`Could not find a valid swap`);
return undefined;
}
const postSplitNow = Date.now();
let quoteGasAdjusted = sumFn(_.map(bestSwap, (routeWithValidQuote) => routeWithValidQuote.quoteAdjustedForGas));
// this calculates the base gas used
// if on L1, its the estimated gas used based on hops and ticks across all the routes
// if on L2, its the gas used on the L2 based on hops and ticks across all the routes
const estimatedGasUsed = _(bestSwap)
.map((routeWithValidQuote) => routeWithValidQuote.gasEstimate)
.reduce((sum, routeWithValidQuote) => sum.add(routeWithValidQuote), BigNumber.from(0));
if (!usdGasTokensByChain[chainId] || !usdGasTokensByChain[chainId][0]) {
// Each route can use a different stablecoin to account its gas costs.
// They should all be pegged, and this is just an estimate, so we do a merge
// to an arbitrary stable.
throw new Error(`Could not find a USD token for computing gas costs on ${chainId}`);
}
const usdToken = usdGasTokensByChain[chainId][0];
const usdTokenDecimals = usdToken.decimals;
// if on L2, calculate the L1 security fee
let gasCostsL1ToL2 = {
gasUsedL1: BigNumber.from(0),
gasCostL1USD: CurrencyAmount.fromRawAmount(usdToken, 0),
gasCostL1QuoteToken: CurrencyAmount.fromRawAmount(
// eslint-disable-next-line @typescript-eslint/no-non-null-asserted-optional-chain
(_a = bestSwap[0]) === null || _a === void 0 ? void 0 : _a.quoteToken, 0),
};
const { gasCostL1USD, gasCostL1QuoteToken } = gasCostsL1ToL2;
// For each gas estimate, normalize decimals to that of the chosen usd token.
const estimatedGasUsedUSDs = _(bestSwap)
.map((routeWithValidQuote) => {
// TODO: will error if gasToken has decimals greater than usdToken
const decimalsDiff = usdTokenDecimals - routeWithValidQuote.gasCostInUSD.currency.decimals;
if (decimalsDiff == 0) {
return CurrencyAmount.fromRawAmount(usdToken, routeWithValidQuote.gasCostInUSD.quotient);
}
return CurrencyAmount.fromRawAmount(usdToken, JSBI.multiply(routeWithValidQuote.gasCostInUSD.quotient, JSBI.exponentiate(JSBI.BigInt(10), JSBI.BigInt(decimalsDiff))));
})
.value();
let estimatedGasUsedUSD = sumFn(estimatedGasUsedUSDs);
// if they are different usd pools, convert to the usdToken
if (estimatedGasUsedUSD.currency != gasCostL1USD.currency) {
const decimalsDiff = usdTokenDecimals - gasCostL1USD.currency.decimals;
estimatedGasUsedUSD = estimatedGasUsedUSD.add(CurrencyAmount.fromRawAmount(usdToken, JSBI.multiply(gasCostL1USD.quotient, JSBI.exponentiate(JSBI.BigInt(10), JSBI.BigInt(decimalsDiff)))));
}
else {
estimatedGasUsedUSD = estimatedGasUsedUSD.add(gasCostL1USD);
}
log.info({
estimatedGasUsedUSD: estimatedGasUsedUSD.toExact(),
normalizedUsdToken: usdToken,
routeUSDGasEstimates: _.map(bestSwap, (b) => `${b.percent}% ${routeToString(b.route)} ${b.gasCostInUSD.toExact()}`),
flatL1GasCostUSD: gasCostL1USD.toExact(),
}, 'USD gas estimates of best route');
const estimatedGasUsedQuoteToken = sumFn(_.map(bestSwap, (routeWithValidQuote) => routeWithValidQuote.gasCostInToken)).add(gasCostL1QuoteToken);
const quote = sumFn(_.map(bestSwap, (routeWithValidQuote) => routeWithValidQuote.quote));
// Adjust the quoteGasAdjusted for the l1 fee
if (routeType == TradeType.EXACT_INPUT) {
const quoteGasAdjustedForL1 = quoteGasAdjusted.subtract(gasCostL1QuoteToken);
quoteGasAdjusted = quoteGasAdjustedForL1;
}
else {
const quoteGasAdjustedForL1 = quoteGasAdjusted.add(gasCostL1QuoteToken);
quoteGasAdjusted = quoteGasAdjustedForL1;
}
const routeWithQuotes = bestSwap.sort((routeAmountA, routeAmountB) => routeAmountB.amount.greaterThan(routeAmountA.amount) ? 1 : -1);
metric.putMetric('PostSplitDone', Date.now() - postSplitNow, MetricLoggerUnit.Milliseconds);
return {
quote,
quoteGasAdjusted,
estimatedGasUsed,
estimatedGasUsedUSD,
estimatedGasUsedQuoteToken,
routes: routeWithQuotes,
};
}
// We do not allow pools to be re-used across split routes, as swapping through a pool changes the pools state.
// Given a list of used routes, this function finds the first route in the list of candidate routes that does not re-use an already used pool.
const findFirstRouteNotUsingUsedPools = (usedRoutes, candidateRouteQuotes, forceCrossProtocol) => {
const poolAddressSet = new Set();
const usedPoolAddresses = _(usedRoutes)
.flatMap((r) => r.poolAddresses)
.value();
for (const poolAddress of usedPoolAddresses) {
poolAddressSet.add(poolAddress);
}
const protocolsSet = new Set();
const usedProtocols = _(usedRoutes)
.flatMap((r) => r.protocol)
.uniq()
.value();
for (const protocol of usedProtocols) {
protocolsSet.add(protocol);
}
for (const routeQuote of candidateRouteQuotes) {
const { poolAddresses, protocol } = routeQuote;
if (poolAddresses.some((poolAddress) => poolAddressSet.has(poolAddress))) {
continue;
}
// This code is just for debugging. Allows us to force a cross-protocol split route by skipping
// consideration of routes that come from the same protocol as a used route.
const needToForce = forceCrossProtocol && protocolsSet.size == 1;
if (needToForce && protocolsSet.has(protocol)) {
continue;
}
return routeQuote;
}
return null;
};
//# 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