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fix: increase Polygon auto-slippage min (#4327)

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* fix: increase Polygon auto-slippage min

* comment

* update percent
This commit is contained in:
Vignesh Mohankumar 2022-08-11 12:15:02 -04:00 committed by GitHub
parent 8dbc91ee6b
commit fe55c7ae7a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 3 deletions
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18
src/hooks/useAutoSlippageTolerance.ts
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@ -1,7 +1,7 @@
import { Protocol, Trade } from '@uniswap/router-sdk'
import { Currency, CurrencyAmount, Percent, TradeType } from '@uniswap/sdk-core'
import { useWeb3React } from '@web3-react/core'
import { SUPPORTED_GAS_ESTIMATE_CHAIN_IDS } from 'constants/chains'
import { SUPPORTED_GAS_ESTIMATE_CHAIN_IDS, SupportedChainId } from 'constants/chains'
import { L2_CHAIN_IDS } from 'constants/chains'
import JSBI from 'jsbi'
import useNativeCurrency from 'lib/hooks/useNativeCurrency'
@ -54,6 +54,7 @@ function guesstimateGas(trade: Trade<Currency, Currency, TradeType> | undefined)
}
const MIN_AUTO_SLIPPAGE_TOLERANCE = new Percent(5, 1000) // 0.5%
const POLYGON_MIN_AUTO_SLIPPAGE_TOLERANCE = new Percent(1, 100) // 1%
const MAX_AUTO_SLIPPAGE_TOLERANCE = new Percent(25, 100) // 25%
/**
@ -96,8 +97,19 @@ export default function useAutoSlippageTolerance(
// the cost of the gas of the failed transaction
const fraction = dollarCostToUse.asFraction.divide(outputDollarValue.asFraction)
const result = new Percent(fraction.numerator, fraction.denominator)
if (result.greaterThan(MAX_AUTO_SLIPPAGE_TOLERANCE)) return MAX_AUTO_SLIPPAGE_TOLERANCE
if (result.lessThan(MIN_AUTO_SLIPPAGE_TOLERANCE)) return MIN_AUTO_SLIPPAGE_TOLERANCE
if (result.greaterThan(MAX_AUTO_SLIPPAGE_TOLERANCE)) {
return MAX_AUTO_SLIPPAGE_TOLERANCE
}
// TODO(vm): Added because ~30% of Polygon swaps were failing due to exceeding slippage.
// The root cause is likely elsewhere, but added for now to reduce failure rate on production.
const isPolygon = chainId && [SupportedChainId.POLYGON, SupportedChainId.POLYGON_MUMBAI].includes(chainId)
const minAutoSlippageTolerance = isPolygon ? POLYGON_MIN_AUTO_SLIPPAGE_TOLERANCE : MIN_AUTO_SLIPPAGE_TOLERANCE
if (result.lessThan(minAutoSlippageTolerance)) {
return minAutoSlippageTolerance
}
return result
}