quickswap-smart-order-router
Version:
QuickSwap Smart Order Router
85 lines • 7.08 kB
JavaScript
import { BigNumber } from '@ethersproject/bignumber';
import { TradeType } from '@uniswap/sdk-core';
import { InsufficientInputAmountError, InsufficientReservesError, } from '@uniswap/v2-sdk';
import { log } from '../../util/log';
import { routeToString } from '../../util/routes';
/**
* Computes quotes for V2 off-chain. Quotes are computed using the balances
* of the pools within each route provided.
*
* @export
* @class V2QuoteProvider
*/
export class V2QuoteProvider {
constructor() { }
async getQuotesManyExactIn(amountIns, routes) {
return this.getQuotes(amountIns, routes, TradeType.EXACT_INPUT);
}
async getQuotesManyExactOut(amountOuts, routes) {
return this.getQuotes(amountOuts, routes, TradeType.EXACT_OUTPUT);
}
async getQuotes(amounts, routes, tradeType) {
const routesWithQuotes = [];
const debugStrs = [];
for (const route of routes) {
const amountQuotes = [];
let insufficientInputAmountErrorCount = 0;
let insufficientReservesErrorCount = 0;
for (const amount of amounts) {
try {
if (tradeType == TradeType.EXACT_INPUT) {
let outputAmount = amount.wrapped;
for (const pair of route.pairs) {
const [outputAmountNew] = pair.getOutputAmount(outputAmount);
outputAmount = outputAmountNew;
}
amountQuotes.push({
amount,
quote: BigNumber.from(outputAmount.quotient.toString()),
});
}
else {
let inputAmount = amount.wrapped;
for (let i = route.pairs.length - 1; i >= 0; i--) {
const pair = route.pairs[i];
[inputAmount] = pair.getInputAmount(inputAmount);
}
amountQuotes.push({
amount,
quote: BigNumber.from(inputAmount.quotient.toString()),
});
}
}
catch (err) {
// Can fail to get quotes, e.g. throws InsufficientReservesError or InsufficientInputAmountError.
if (err instanceof InsufficientInputAmountError) {
insufficientInputAmountErrorCount =
insufficientInputAmountErrorCount + 1;
amountQuotes.push({ amount, quote: null });
}
else if (err instanceof InsufficientReservesError) {
insufficientReservesErrorCount = insufficientReservesErrorCount + 1;
amountQuotes.push({ amount, quote: null });
}
else {
throw err;
}
}
}
if (insufficientInputAmountErrorCount > 0 ||
insufficientReservesErrorCount > 0) {
debugStrs.push(`${[
routeToString(route),
]} Input: ${insufficientInputAmountErrorCount} Reserves: ${insufficientReservesErrorCount} }`);
}
routesWithQuotes.push([route, amountQuotes]);
}
if (debugStrs.length > 0) {
log.info({ debugStrs }, `Failed quotes for V2 routes`);
}
return {
routesWithQuotes,
};
}
}
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