@xspswap/smart-order-router
Version:
XSwap Protocol V3 Smart Order Router
215 lines • 21.3 kB
JavaScript
import { BigNumber } from '@ethersproject/bignumber';
import { Price, WETH9 } from '@x-swap-protocol/sdk-core';
import _ from 'lodash';
import { CurrencyAmount } from '../../../../util/amounts';
import { getHighestLiquidityV3NativePool, getHighestLiquidityV3USDPool, } from '../../../../util/gas-factory-helpers';
import { log } from '../../../../util/log';
import { IOnChainGasModelFactory, } from '../gas-model';
import { BASE_SWAP_COST, COST_PER_HOP, COST_PER_INIT_TICK, COST_PER_UNINIT_TICK, } from './gas-costs';
/**
* Computes a gas estimate for a V3 swap using heuristics.
* Considers number of hops in the route, number of ticks crossed
* and the typical base cost for a swap.
*
* We get the number of ticks crossed in a swap from the QuoterV2
* contract.
*
* We compute gas estimates off-chain because
* 1/ Calling eth_estimateGas for a swaps requires the caller to have
* the full balance token being swapped, and approvals.
* 2/ Tracking gas used using a wrapper contract is not accurate with Multicall
* due to EIP-2929. We would have to make a request for every swap we wanted to estimate.
* 3/ For V2 we simulate all our swaps off-chain so have no way to track gas used.
*
* @export
* @class V3HeuristicGasModelFactory
*/
export class V3HeuristicGasModelFactory extends IOnChainGasModelFactory {
constructor() {
super();
}
async buildGasModel({ chainId, gasPriceWei, v3poolProvider: poolProvider, amountToken, quoteToken, }) {
const usdPool = await getHighestLiquidityV3USDPool(chainId, poolProvider);
const calculateL1GasFees = async () => {
let l1Used = BigNumber.from(0);
let l1FeeInWei = BigNumber.from(0);
// wrap fee to native currency
const nativeCurrency = WETH9[chainId];
const costNativeCurrency = CurrencyAmount.fromRawAmount(nativeCurrency, l1FeeInWei.toString());
// convert fee into usd
const nativeTokenPrice = usdPool.token0.address == nativeCurrency.address
? usdPool.token0Price
: usdPool.token1Price;
const gasCostL1USD = nativeTokenPrice.quote(costNativeCurrency);
let gasCostL1QuoteToken = costNativeCurrency;
// if the inputted token is not in the native currency, quote a native/quote token pool to get the gas cost in terms of the quote token
if (!quoteToken.equals(nativeCurrency)) {
const nativePool = await getHighestLiquidityV3NativePool(quoteToken, poolProvider);
if (!nativePool) {
log.info('Could not find a pool to convert the cost into the quote token');
gasCostL1QuoteToken = CurrencyAmount.fromRawAmount(quoteToken, 0);
}
else {
const nativeTokenPrice = nativePool.token0.address == nativeCurrency.address
? nativePool.token0Price
: nativePool.token1Price;
gasCostL1QuoteToken = nativeTokenPrice.quote(costNativeCurrency);
}
}
// gasUsedL1 is the gas units used calculated from the bytes of the calldata
// gasCostL1USD and gasCostL1QuoteToken is the cost of gas in each of those tokens
return {
gasUsedL1: l1Used,
gasCostL1USD,
gasCostL1QuoteToken,
};
};
// If our quote token is WETH, we don't need to convert our gas use to be in terms
// of the quote token in order to produce a gas adjusted amount.
// We do return a gas use in USD however, so we still convert to usd.
const nativeCurrency = WETH9[chainId];
if (quoteToken.equals(nativeCurrency)) {
const estimateGasCost = (routeWithValidQuote) => {
const { totalGasCostNativeCurrency, baseGasUse } = this.estimateGas(routeWithValidQuote, gasPriceWei, chainId);
const token0 = usdPool.token0.address == nativeCurrency.address;
const nativeTokenPrice = token0
? usdPool.token0Price
: usdPool.token1Price;
const gasCostInTermsOfUSD = nativeTokenPrice.quote(totalGasCostNativeCurrency);
return {
gasEstimate: baseGasUse,
gasCostInToken: totalGasCostNativeCurrency,
gasCostInUSD: gasCostInTermsOfUSD,
};
};
return {
estimateGasCost,
calculateL1GasFees,
};
}
// If the quote token is not in the native currency, we convert the gas cost to be in terms of the quote token.
// We do this by getting the highest liquidity <quoteToken>/<nativeCurrency> pool. eg. <quoteToken>/ETH pool.
const nativePool = await getHighestLiquidityV3NativePool(quoteToken, poolProvider);
let nativeAmountPool = null;
if (!amountToken.equals(nativeCurrency)) {
nativeAmountPool = await getHighestLiquidityV3NativePool(amountToken, poolProvider);
}
const usdToken = usdPool.token0.address == nativeCurrency.address
? usdPool.token1
: usdPool.token0;
const estimateGasCost = (routeWithValidQuote) => {
const { totalGasCostNativeCurrency, baseGasUse } = this.estimateGas(routeWithValidQuote, gasPriceWei, chainId);
let gasCostInTermsOfQuoteToken = null;
if (nativePool) {
const token0 = nativePool.token0.address == nativeCurrency.address;
// returns mid price in terms of the native currency (the ratio of quoteToken/nativeToken)
const nativeTokenPrice = token0
? nativePool.token0Price
: nativePool.token1Price;
try {
// native token is base currency
gasCostInTermsOfQuoteToken = nativeTokenPrice.quote(totalGasCostNativeCurrency);
}
catch (err) {
log.info({
nativeTokenPriceBase: nativeTokenPrice.baseCurrency,
nativeTokenPriceQuote: nativeTokenPrice.quoteCurrency,
gasCostInEth: totalGasCostNativeCurrency.currency,
}, 'Debug eth price token issue');
throw err;
}
}
// we have a nativeAmountPool, but not a nativePool
else {
log.info(`Unable to find ${nativeCurrency.symbol} pool with the quote token, ${quoteToken.symbol} to produce gas adjusted costs. Using amountToken to calculate gas costs.`);
}
// Highest liquidity pool for the non quote token / ETH
// A pool with the non quote token / ETH should not be required and errors should be handled separately
if (nativeAmountPool) {
// get current execution price (amountToken / quoteToken)
const executionPrice = new Price(routeWithValidQuote.amount.currency, routeWithValidQuote.quote.currency, routeWithValidQuote.amount.quotient, routeWithValidQuote.quote.quotient);
const inputIsToken0 = nativeAmountPool.token0.address == nativeCurrency.address;
// ratio of input / native
const nativeAmountTokenPrice = inputIsToken0
? nativeAmountPool.token0Price
: nativeAmountPool.token1Price;
const gasCostInTermsOfAmountToken = nativeAmountTokenPrice.quote(totalGasCostNativeCurrency);
// Convert gasCostInTermsOfAmountToken to quote token using execution price
const syntheticGasCostInTermsOfQuoteToken = executionPrice.quote(gasCostInTermsOfAmountToken);
// Note that the syntheticGasCost being lessThan the original quoted value is not always strictly better
// e.g. the scenario where the amountToken/ETH pool is very illiquid as well and returns an extremely small number
// however, it is better to have the gasEstimation be almost 0 than almost infinity, as the user will still receive a quote
if (gasCostInTermsOfQuoteToken === null ||
syntheticGasCostInTermsOfQuoteToken.lessThan(gasCostInTermsOfQuoteToken.asFraction)) {
log.info({
nativeAmountTokenPrice: nativeAmountTokenPrice.toSignificant(6),
gasCostInTermsOfQuoteToken: gasCostInTermsOfQuoteToken
? gasCostInTermsOfQuoteToken.toExact()
: 0,
gasCostInTermsOfAmountToken: gasCostInTermsOfAmountToken.toExact(),
executionPrice: executionPrice.toSignificant(6),
syntheticGasCostInTermsOfQuoteToken: syntheticGasCostInTermsOfQuoteToken.toSignificant(6),
}, 'New gasCostInTermsOfQuoteToken calculated with synthetic quote token price is less than original');
gasCostInTermsOfQuoteToken = syntheticGasCostInTermsOfQuoteToken;
}
}
// true if token0 is the native currency
const token0USDPool = usdPool.token0.address == nativeCurrency.address;
// gets the mid price of the pool in terms of the native token
const nativeTokenPriceUSDPool = token0USDPool
? usdPool.token0Price
: usdPool.token1Price;
let gasCostInTermsOfUSD;
try {
gasCostInTermsOfUSD = nativeTokenPriceUSDPool.quote(totalGasCostNativeCurrency);
}
catch (err) {
log.info({
usdT1: usdPool.token0.symbol,
usdT2: usdPool.token1.symbol,
gasCostInNativeToken: totalGasCostNativeCurrency.currency.symbol,
}, 'Failed to compute USD gas price');
throw err;
}
// If gasCostInTermsOfQuoteToken is null, both attempts to calculate gasCostInTermsOfQuoteToken failed (nativePool and amountNativePool)
if (gasCostInTermsOfQuoteToken === null) {
log.info(`Unable to find ${nativeCurrency.symbol} pool with the quote token, ${quoteToken.symbol}, or amount Token, ${amountToken.symbol} to produce gas adjusted costs. Route will not account for gas.`);
return {
gasEstimate: baseGasUse,
gasCostInToken: CurrencyAmount.fromRawAmount(quoteToken, 0),
gasCostInUSD: CurrencyAmount.fromRawAmount(usdToken, 0),
};
}
return {
gasEstimate: baseGasUse,
gasCostInToken: gasCostInTermsOfQuoteToken,
gasCostInUSD: gasCostInTermsOfUSD,
};
};
return {
estimateGasCost: estimateGasCost.bind(this),
calculateL1GasFees,
};
}
estimateGas(routeWithValidQuote, gasPriceWei, chainId) {
const totalInitializedTicksCrossed = BigNumber.from(Math.max(1, _.sum(routeWithValidQuote.initializedTicksCrossedList)));
const totalHops = BigNumber.from(routeWithValidQuote.route.pools.length);
const hopsGasUse = COST_PER_HOP(chainId).mul(totalHops);
const tickGasUse = COST_PER_INIT_TICK(chainId).mul(totalInitializedTicksCrossed);
const uninitializedTickGasUse = COST_PER_UNINIT_TICK.mul(0);
// base estimate gas used based on chainId estimates for hops and ticks gas useage
const baseGasUse = BASE_SWAP_COST(chainId)
.add(hopsGasUse)
.add(tickGasUse)
.add(uninitializedTickGasUse);
const baseGasCostWei = gasPriceWei.mul(baseGasUse);
const wrappedCurrency = WETH9[chainId];
const totalGasCostNativeCurrency = CurrencyAmount.fromRawAmount(wrappedCurrency, baseGasCostWei.toString());
return {
totalGasCostNativeCurrency,
totalInitializedTicksCrossed,
baseGasUse,
};
}
}
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