import { TransactionResponse } from '@ethersproject/abstract-provider' import { AddressZero } from '@ethersproject/constants' import { Currency, CurrencyAmount, Fraction, JSBI, Percent, Token, TokenAmount, WETH } from '@uniswap/sdk' import React, { useCallback, useMemo, useState } from 'react' import ReactGA from 'react-ga' import { Redirect, RouteComponentProps } from 'react-router' import { Text } from 'rebass' import { ButtonConfirmed } from '../../components/Button' import { LightCard, PinkCard, YellowCard } from '../../components/Card' import { AutoColumn } from '../../components/Column' import CurrencyLogo from '../../components/CurrencyLogo' import FormattedCurrencyAmount from '../../components/FormattedCurrencyAmount' import QuestionHelper from '../../components/QuestionHelper' import { AutoRow, RowBetween, RowFixed } from '../../components/Row' import { Dots } from '../../components/swap/styleds' import { DEFAULT_DEADLINE_FROM_NOW, INITIAL_ALLOWED_SLIPPAGE } from '../../constants' import { MIGRATOR_ADDRESS } from '../../constants/abis/migrator' import { PairState, usePair } from '../../data/Reserves' import { useTotalSupply } from '../../data/TotalSupply' import { useActiveWeb3React } from '../../hooks' import { useToken } from '../../hooks/Tokens' import { ApprovalState, useApproveCallback } from '../../hooks/useApproveCallback' import { useV1ExchangeContract, useV2MigratorContract } from '../../hooks/useContract' import { NEVER_RELOAD, useSingleCallResult } from '../../state/multicall/hooks' import { useIsTransactionPending, useTransactionAdder } from '../../state/transactions/hooks' import { useETHBalances, useTokenBalance } from '../../state/wallet/hooks' import { BackArrow, ExternalLink, TYPE } from '../../theme' import { getEtherscanLink, isAddress } from '../../utils' import { BodyWrapper } from '../AppBody' import { EmptyState } from './EmptyState' const WEI_DENOM = JSBI.exponentiate(JSBI.BigInt(10), JSBI.BigInt(18)) const ZERO = JSBI.BigInt(0) const ONE = JSBI.BigInt(1) const ZERO_FRACTION = new Fraction(ZERO, ONE) const ALLOWED_OUTPUT_MIN_PERCENT = new Percent(JSBI.BigInt(10000 - INITIAL_ALLOWED_SLIPPAGE), JSBI.BigInt(10000)) export function V1LiquidityInfo({ token, liquidityTokenAmount, tokenWorth, ethWorth }: { token: Token liquidityTokenAmount: TokenAmount tokenWorth: TokenAmount ethWorth: CurrencyAmount }) { const { chainId } = useActiveWeb3React() return ( <> <AutoRow style={{ justifyContent: 'flex-start', width: 'fit-content' }}> <CurrencyLogo size="24px" currency={token} /> <div style={{ marginLeft: '.75rem' }}> <TYPE.mediumHeader> {<FormattedCurrencyAmount currencyAmount={liquidityTokenAmount} />}{' '} {chainId && token.equals(WETH[chainId]) ? 'WETH' : token.symbol}/ETH </TYPE.mediumHeader> </div> </AutoRow> <RowBetween my="1rem"> <Text fontSize={16} fontWeight={500}> Pooled {chainId && token.equals(WETH[chainId]) ? 'WETH' : token.symbol}: </Text> <RowFixed> <Text fontSize={16} fontWeight={500} marginLeft={'6px'}> {tokenWorth.toSignificant(4)} </Text> <CurrencyLogo size="20px" style={{ marginLeft: '8px' }} currency={token} /> </RowFixed> </RowBetween> <RowBetween mb="1rem"> <Text fontSize={16} fontWeight={500}> Pooled ETH: </Text> <RowFixed> <Text fontSize={16} fontWeight={500} marginLeft={'6px'}> <FormattedCurrencyAmount currencyAmount={ethWorth} /> </Text> <CurrencyLogo size="20px" style={{ marginLeft: '8px' }} currency={Currency.ETHER} /> </RowFixed> </RowBetween> </> ) } function V1PairMigration({ liquidityTokenAmount, token }: { liquidityTokenAmount: TokenAmount; token: Token }) { const { account, chainId } = useActiveWeb3React() const totalSupply = useTotalSupply(liquidityTokenAmount.token) const exchangeETHBalance = useETHBalances([liquidityTokenAmount.token.address])?.[liquidityTokenAmount.token.address] const exchangeTokenBalance = useTokenBalance(liquidityTokenAmount.token.address, token) const [v2PairState, v2Pair] = usePair(chainId ? WETH[chainId] : undefined, token) const isFirstLiquidityProvider: boolean = v2PairState === PairState.NOT_EXISTS const v2SpotPrice = chainId && v2Pair ? v2Pair.reserveOf(token).divide(v2Pair.reserveOf(WETH[chainId])) : undefined const [confirmingMigration, setConfirmingMigration] = useState<boolean>(false) const [pendingMigrationHash, setPendingMigrationHash] = useState<string | null>(null) const shareFraction: Fraction = totalSupply ? new Percent(liquidityTokenAmount.raw, totalSupply.raw) : ZERO_FRACTION const ethWorth: CurrencyAmount = exchangeETHBalance ? CurrencyAmount.ether(exchangeETHBalance.multiply(shareFraction).multiply(WEI_DENOM).quotient) : CurrencyAmount.ether(ZERO) const tokenWorth: TokenAmount = exchangeTokenBalance ? new TokenAmount(token, shareFraction.multiply(exchangeTokenBalance.raw).quotient) : new TokenAmount(token, ZERO) const [approval, approve] = useApproveCallback(liquidityTokenAmount, MIGRATOR_ADDRESS) const v1SpotPrice = exchangeTokenBalance && exchangeETHBalance ? exchangeTokenBalance.divide(new Fraction(exchangeETHBalance.raw, WEI_DENOM)) : null const priceDifferenceFraction: Fraction | undefined = v1SpotPrice && v2SpotPrice ? v1SpotPrice .divide(v2SpotPrice) .multiply('100') .subtract('100') : undefined const priceDifferenceAbs: Fraction | undefined = priceDifferenceFraction?.lessThan(ZERO) ? priceDifferenceFraction?.multiply('-1') : priceDifferenceFraction const minAmountETH: JSBI | undefined = v2SpotPrice && tokenWorth ? tokenWorth .divide(v2SpotPrice) .multiply(WEI_DENOM) .multiply(ALLOWED_OUTPUT_MIN_PERCENT).quotient : ethWorth?.numerator const minAmountToken: JSBI | undefined = v2SpotPrice && ethWorth ? ethWorth .multiply(v2SpotPrice) .multiply(JSBI.exponentiate(JSBI.BigInt(10), JSBI.BigInt(token.decimals))) .multiply(ALLOWED_OUTPUT_MIN_PERCENT).quotient : tokenWorth?.numerator const addTransaction = useTransactionAdder() const isMigrationPending = useIsTransactionPending(pendingMigrationHash ?? undefined) const migrator = useV2MigratorContract() const migrate = useCallback(() => { if (!minAmountToken || !minAmountETH || !migrator) return setConfirmingMigration(true) migrator .migrate( token.address, minAmountToken.toString(), minAmountETH.toString(), account, Math.floor(new Date().getTime() / 1000) + DEFAULT_DEADLINE_FROM_NOW ) .then((response: TransactionResponse) => { ReactGA.event({ category: 'Migrate', action: 'V1->V2', label: token?.symbol }) addTransaction(response, { summary: `Migrate ${token.symbol} liquidity to V2` }) setPendingMigrationHash(response.hash) }) .catch(() => { setConfirmingMigration(false) }) }, [minAmountToken, minAmountETH, migrator, token, account, addTransaction]) const noLiquidityTokens = !!liquidityTokenAmount && liquidityTokenAmount.equalTo(ZERO) const largePriceDifference = !!priceDifferenceAbs && !priceDifferenceAbs.lessThan(JSBI.BigInt(5)) const isSuccessfullyMigrated = !!pendingMigrationHash && noLiquidityTokens return ( <AutoColumn gap="20px"> <TYPE.body my={9} style={{ fontWeight: 400 }}> This tool will safely migrate your V1 liquidity to V2 with minimal price risk. The process is completely trustless thanks to the{' '} {chainId && ( <ExternalLink href={getEtherscanLink(chainId, MIGRATOR_ADDRESS, 'address')}> <TYPE.blue display="inline">Uniswap migration contract↗</TYPE.blue> </ExternalLink> )} . </TYPE.body> {!isFirstLiquidityProvider && largePriceDifference ? ( <YellowCard> <TYPE.body style={{ marginBottom: 8, fontWeight: 400 }}> It{"'"}s best to deposit liquidity into Uniswap V2 at a price you believe is correct. If the V2 price seems incorrect, you can either make a swap to move the price or wait for someone else to do so. </TYPE.body> <AutoColumn gap="8px"> <RowBetween> <TYPE.body>V1 Price:</TYPE.body> <TYPE.black> {v1SpotPrice?.toSignificant(6)} {token.symbol}/ETH </TYPE.black> </RowBetween> <RowBetween> <div /> <TYPE.black> {v1SpotPrice?.invert()?.toSignificant(6)} ETH/{token.symbol} </TYPE.black> </RowBetween> <RowBetween> <TYPE.body>V2 Price:</TYPE.body> <TYPE.black> {v2SpotPrice?.toSignificant(6)} {token.symbol}/ETH </TYPE.black> </RowBetween> <RowBetween> <div /> <TYPE.black> {v2SpotPrice?.invert()?.toSignificant(6)} ETH/{token.symbol} </TYPE.black> </RowBetween> <RowBetween> <TYPE.body color="inherit">Price Difference:</TYPE.body> <TYPE.black color="inherit">{priceDifferenceAbs?.toSignificant(4)}%</TYPE.black> </RowBetween> </AutoColumn> </YellowCard> ) : null} {isFirstLiquidityProvider && ( <PinkCard> <TYPE.body style={{ marginBottom: 8, fontWeight: 400 }}> You are the first liquidity provider for this pair on Uniswap V2. Your liquidity will be migrated at the current V1 price. Your transaction cost also includes the gas to create the pool. </TYPE.body> <AutoColumn gap="8px"> <RowBetween> <TYPE.body>V1 Price:</TYPE.body> <TYPE.black> {v1SpotPrice?.toSignificant(6)} {token.symbol}/ETH </TYPE.black> </RowBetween> <RowBetween> <div /> <TYPE.black> {v1SpotPrice?.invert()?.toSignificant(6)} ETH/{token.symbol} </TYPE.black> </RowBetween> </AutoColumn> </PinkCard> )} <LightCard> <V1LiquidityInfo token={token} liquidityTokenAmount={liquidityTokenAmount} tokenWorth={tokenWorth} ethWorth={ethWorth} /> <div style={{ display: 'flex', marginTop: '1rem' }}> <AutoColumn gap="12px" style={{ flex: '1', marginRight: 12 }}> <ButtonConfirmed confirmed={approval === ApprovalState.APPROVED} disabled={approval !== ApprovalState.NOT_APPROVED} onClick={approve} > {approval === ApprovalState.PENDING ? ( <Dots>Approving</Dots> ) : approval === ApprovalState.APPROVED ? ( 'Approved' ) : ( 'Approve' )} </ButtonConfirmed> </AutoColumn> <AutoColumn gap="12px" style={{ flex: '1' }}> <ButtonConfirmed confirmed={isSuccessfullyMigrated} disabled={ isSuccessfullyMigrated || noLiquidityTokens || isMigrationPending || approval !== ApprovalState.APPROVED || confirmingMigration } onClick={migrate} > {isSuccessfullyMigrated ? 'Success' : isMigrationPending ? <Dots>Migrating</Dots> : 'Migrate'} </ButtonConfirmed> </AutoColumn> </div> </LightCard> <TYPE.darkGray style={{ textAlign: 'center' }}> {`Your Uniswap V1 ${token.symbol}/ETH liquidity will become Uniswap V2 ${token.symbol}/ETH liquidity.`} </TYPE.darkGray> </AutoColumn> ) } export default function MigrateV1Exchange({ history, match: { params: { address } } }: RouteComponentProps<{ address: string }>) { const validatedAddress = isAddress(address) const { chainId, account } = useActiveWeb3React() const exchangeContract = useV1ExchangeContract(validatedAddress ? validatedAddress : undefined) const tokenAddress = useSingleCallResult(exchangeContract, 'tokenAddress', undefined, NEVER_RELOAD)?.result?.[0] const token = useToken(tokenAddress) const liquidityToken: Token | undefined = useMemo( () => validatedAddress && chainId && token ? new Token(chainId, validatedAddress, 18, `UNI-V1-${token.symbol}`, 'Uniswap V1') : undefined, [chainId, validatedAddress, token] ) const userLiquidityBalance = useTokenBalance(account ?? undefined, liquidityToken) // redirect for invalid url params if (!validatedAddress || tokenAddress === AddressZero) { console.error('Invalid address in path', address) return <Redirect to="/migrate/v1" /> } return ( <BodyWrapper style={{ padding: 24 }}> <AutoColumn gap="16px"> <AutoRow style={{ alignItems: 'center', justifyContent: 'space-between' }} gap="8px"> <BackArrow to="/migrate/v1" /> <TYPE.mediumHeader>Migrate V1 Liquidity</TYPE.mediumHeader> <div> <QuestionHelper text="Migrate your liquidity tokens from Uniswap V1 to Uniswap V2." /> </div> </AutoRow> {!account ? ( <TYPE.largeHeader>You must connect an account.</TYPE.largeHeader> ) : validatedAddress && chainId && token?.equals(WETH[chainId]) ? ( <> <TYPE.body my={9} style={{ fontWeight: 400 }}> Because Uniswap V2 uses WETH under the hood, your Uniswap V1 WETH/ETH liquidity cannot be migrated. You may want to remove your liquidity instead. </TYPE.body> <ButtonConfirmed onClick={() => { history.push(`/remove/v1/${validatedAddress}`) }} > Remove </ButtonConfirmed> </> ) : userLiquidityBalance && token ? ( <V1PairMigration liquidityTokenAmount={userLiquidityBalance} token={token} /> ) : ( <EmptyState message="Loading..." /> )} </AutoColumn> </BodyWrapper> ) }