forked from Uniswap/interface
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathV1.ts
More file actions
187 lines (163 loc) · 6.14 KB
/
Copy pathV1.ts
File metadata and controls
187 lines (163 loc) · 6.14 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
import { AddressZero } from '@ethersproject/constants'
import {
BigintIsh,
Currency,
CurrencyAmount,
currencyEquals,
ETHER,
JSBI,
Pair,
Percent,
Route,
Token,
TokenAmount,
Trade,
TradeType,
WETH
} from '@uniswap/sdk'
import { useMemo } from 'react'
import { useActiveWeb3React } from '../hooks'
import { useAllTokens } from '../hooks/Tokens'
import { useV1FactoryContract } from '../hooks/useContract'
import { Version } from '../hooks/useToggledVersion'
import { NEVER_RELOAD, useSingleCallResult, useSingleContractMultipleData } from '../state/multicall/hooks'
import { useETHBalances, useTokenBalance, useTokenBalances } from '../state/wallet/hooks'
export function useV1ExchangeAddress(tokenAddress?: string): string | undefined {
const contract = useV1FactoryContract()
const inputs = useMemo(() => [tokenAddress], [tokenAddress])
return useSingleCallResult(contract, 'getExchange', inputs)?.result?.[0]
}
export class MockV1Pair extends Pair {
constructor(etherAmount: BigintIsh, tokenAmount: TokenAmount) {
super(tokenAmount, new TokenAmount(WETH[tokenAmount.token.chainId], etherAmount))
}
}
function useMockV1Pair(inputCurrency?: Currency): MockV1Pair | undefined {
const token = inputCurrency instanceof Token ? inputCurrency : undefined
const isWETH = Boolean(token && token.equals(WETH[token.chainId]))
const v1PairAddress = useV1ExchangeAddress(isWETH ? undefined : token?.address)
const tokenBalance = useTokenBalance(v1PairAddress, token)
const ETHBalance = useETHBalances([v1PairAddress])[v1PairAddress ?? '']
return useMemo(
() =>
token && tokenBalance && ETHBalance && inputCurrency ? new MockV1Pair(ETHBalance.raw, tokenBalance) : undefined,
[ETHBalance, inputCurrency, token, tokenBalance]
)
}
// returns all v1 exchange addresses in the user's token list
export function useAllTokenV1Exchanges(): { [exchangeAddress: string]: Token } {
const allTokens = useAllTokens()
const factory = useV1FactoryContract()
const args = useMemo(() => Object.keys(allTokens).map(tokenAddress => [tokenAddress]), [allTokens])
const data = useSingleContractMultipleData(factory, 'getExchange', args, NEVER_RELOAD)
return useMemo(
() =>
data?.reduce<{ [exchangeAddress: string]: Token }>((memo, { result }, ix) => {
if (result?.[0] && result[0] !== AddressZero) {
memo[result[0]] = allTokens[args[ix][0]]
}
return memo
}, {}) ?? {},
[allTokens, args, data]
)
}
// returns whether any of the tokens in the user's token list have liquidity on v1
export function useUserHasLiquidityInAllTokens(): boolean | undefined {
const { account, chainId } = useActiveWeb3React()
const exchanges = useAllTokenV1Exchanges()
const v1ExchangeLiquidityTokens = useMemo(
() =>
chainId ? Object.keys(exchanges).map(address => new Token(chainId, address, 18, 'UNI-V1', 'Uniswap V1')) : [],
[chainId, exchanges]
)
const balances = useTokenBalances(account ?? undefined, v1ExchangeLiquidityTokens)
return useMemo(
() =>
Object.keys(balances).some(tokenAddress => {
const b = balances[tokenAddress]?.raw
return b && JSBI.greaterThan(b, JSBI.BigInt(0))
}),
[balances]
)
}
/**
* Returns the trade to execute on V1 to go between input and output token
*/
export function useV1Trade(
isExactIn?: boolean,
inputCurrency?: Currency,
outputCurrency?: Currency,
exactAmount?: CurrencyAmount
): Trade | undefined {
// get the mock v1 pairs
const inputPair = useMockV1Pair(inputCurrency)
const outputPair = useMockV1Pair(outputCurrency)
const inputIsETH = inputCurrency === ETHER
const outputIsETH = outputCurrency === ETHER
// construct a direct or through ETH v1 route
let pairs: Pair[] = []
if (inputIsETH && outputPair) {
pairs = [outputPair]
} else if (outputIsETH && inputPair) {
pairs = [inputPair]
}
// if neither are ETH, it's token-to-token (if they both exist)
else if (inputPair && outputPair) {
pairs = [inputPair, outputPair]
}
const route = inputCurrency && pairs && pairs.length > 0 && new Route(pairs, inputCurrency, outputCurrency)
let v1Trade: Trade | undefined
try {
v1Trade =
route && exactAmount
? new Trade(route, exactAmount, isExactIn ? TradeType.EXACT_INPUT : TradeType.EXACT_OUTPUT)
: undefined
} catch (error) {
console.debug('Failed to create V1 trade', error)
}
return v1Trade
}
export function getTradeVersion(trade?: Trade): Version | undefined {
const isV1 = trade?.route?.pairs?.some(pair => pair instanceof MockV1Pair)
if (isV1) return Version.v1
if (isV1 === false) return Version.v2
return undefined
}
// returns the v1 exchange against which a trade should be executed
export function useV1TradeExchangeAddress(trade: Trade | undefined): string | undefined {
const tokenAddress: string | undefined = useMemo(() => {
if (!trade) return undefined
const isV1 = getTradeVersion(trade) === Version.v1
if (!isV1) return undefined
return trade.inputAmount instanceof TokenAmount
? trade.inputAmount.token.address
: trade.outputAmount instanceof TokenAmount
? trade.outputAmount.token.address
: undefined
}, [trade])
return useV1ExchangeAddress(tokenAddress)
}
const ZERO_PERCENT = new Percent('0')
const ONE_HUNDRED_PERCENT = new Percent('1')
// returns whether tradeB is better than tradeA by at least a threshold percentage amount
export function isTradeBetter(
tradeA: Trade | undefined,
tradeB: Trade | undefined,
minimumDelta: Percent = ZERO_PERCENT
): boolean | undefined {
if (tradeA && !tradeB) return false
if (tradeB && !tradeA) return true
if (!tradeA || !tradeB) return undefined
if (
tradeA.tradeType !== tradeB.tradeType ||
!currencyEquals(tradeA.inputAmount.currency, tradeB.inputAmount.currency) ||
!currencyEquals(tradeB.outputAmount.currency, tradeB.outputAmount.currency)
) {
throw new Error('Trades are not comparable')
}
if (minimumDelta.equalTo(ZERO_PERCENT)) {
return tradeA.executionPrice.lessThan(tradeB.executionPrice)
} else {
return tradeA.executionPrice.raw.multiply(minimumDelta.add(ONE_HUNDRED_PERCENT)).lessThan(tradeB.executionPrice)
}
}