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feat: Adjust gas estimates for auto slippage (#4213)

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* refactor: Adjust gas estimates for auto slippage

* TODO for interleaved routes

* pr feedback
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willpote 2022-08-05 23:03:16 +01:00 committed by GitHub
parent 51aa02d878
commit c7b49deb0f
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1 changed files with 31 additions and 4 deletions
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35
src/hooks/useAutoSlippageTolerance.ts
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@ -1,4 +1,4 @@
import { Trade } from '@uniswap/router-sdk'
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'
@ -14,14 +14,41 @@ import useStablecoinPrice, { useStablecoinValue } from './useStablecoinPrice'
const V3_SWAP_DEFAULT_SLIPPAGE = new Percent(50, 10_000) // .50%
const ONE_TENTHS_PERCENT = new Percent(10, 10_000) // .10%
export const DEFAULT_AUTO_SLIPPAGE = ONE_TENTHS_PERCENT
const GAS_ESTIMATE_BUFFER = new Percent(10, 100) // 10%
// Base costs regardless of how many hops in the route
const V3_SWAP_BASE_GAS_ESTIMATE = 100_000
const V2_SWAP_BASE_GAS_ESTIMATE = 135_000
// Extra cost per hop in the route
const V3_SWAP_HOP_GAS_ESTIMATE = 70_000
const V2_SWAP_HOP_GAS_ESTIMATE = 50_000
/**
* Return a guess of the gas cost used in computing slippage tolerance for a given trade
* @param trade the trade for which to _guess_ the amount of gas it would cost to execute
*
* V3 logic is inspired by:
* https://github.com/Uniswap/smart-order-router/blob/main/src/routers/alpha-router/gas-models/v3/v3-heuristic-gas-model.ts
* V2 logic is inspired by:
* https://github.com/Uniswap/smart-order-router/blob/main/src/routers/alpha-router/gas-models/v2/v2-heuristic-gas-model.ts
*/
function guesstimateGas(trade: Trade<Currency, Currency, TradeType> | undefined): number | undefined {
if (!!trade) {
return 100_000 + trade.swaps.reduce((memo, swap) => swap.route.pools.length + memo, 0) * 30_000
let gas = 0
for (const { route } of trade.swaps) {
if (route.protocol === Protocol.V2) {
gas += V2_SWAP_BASE_GAS_ESTIMATE + route.pools.length * V2_SWAP_HOP_GAS_ESTIMATE
} else if (route.protocol === Protocol.V3) {
// V3 gas costs scale on initialized ticks being crossed, but we don't have that data here.
// We bake in some tick crossings into the base 100k cost.
gas += V3_SWAP_BASE_GAS_ESTIMATE + route.pools.length * V3_SWAP_HOP_GAS_ESTIMATE
} else {
// TODO: Update with better estimates once we have interleaved routes.
gas += V3_SWAP_BASE_GAS_ESTIMATE + route.pools.length * V3_SWAP_HOP_GAS_ESTIMATE
}
}
return gas
}
return undefined
}
@ -61,8 +88,8 @@ export default function useAutoSlippageTolerance(
// if not, use local heuristic
const dollarCostToUse =
chainId && SUPPORTED_GAS_ESTIMATE_CHAIN_IDS.includes(chainId) && trade?.gasUseEstimateUSD
? trade.gasUseEstimateUSD
: dollarGasCost
? trade.gasUseEstimateUSD.multiply(GAS_ESTIMATE_BUFFER)
: dollarGasCost?.multiply(GAS_ESTIMATE_BUFFER)
if (outputDollarValue && dollarCostToUse) {
// the rationale is that a user will not want their trade to fail for a loss due to slippage that is less than