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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| import { BigDecimal } from '@graphprotocol/graph-ts' | ||
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| import { Pair, Token } from '../types/schema' | ||
| import { ZERO_BD } from './helpers' | ||
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| const STABLECOINS: string[] = [ | ||
| '0x6b175474e89094c44da98b954eedeac495271d0f', // DAI | ||
| '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48', // USDC | ||
| '0xdac17f958d2ee523a2206206994597c13d831ec7', // USDT | ||
| ] | ||
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| export function isStablecoin(token: string): boolean { | ||
| return STABLECOINS.includes(token) | ||
| } | ||
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| export function updatePrimaryUsdPrices(pair: Pair, token0: Token, token1: Token): void { | ||
| if (isStablecoin(pair.token0) && isStablecoin(pair.token1)) { | ||
| return | ||
| } | ||
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| if (isStablecoin(pair.token0)) { | ||
| token1.primaryUsdPrice = pair.reserve0.div(pair.reserve1) | ||
| } else if (isStablecoin(pair.token1)) { | ||
| token0.primaryUsdPrice = pair.reserve1.div(pair.reserve0) | ||
| } | ||
| } | ||
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| export function safeDiv(a: BigDecimal, b: BigDecimal): BigDecimal { | ||
| if (b.equals(ZERO_BD)) { | ||
| return ZERO_BD | ||
| } | ||
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| return a.div(b) | ||
| } | ||
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| export function getPrimaryUsdLiquidity(pair: Pair): BigDecimal { | ||
| if (isStablecoin(pair.token0) && isStablecoin(pair.token1)) { | ||
| return pair.reserve0.plus(pair.reserve1) | ||
| } | ||
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| if (isStablecoin(pair.token0)) { | ||
| return pair.reserve0 | ||
| } | ||
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| if (isStablecoin(pair.token1)) { | ||
| return pair.reserve1 | ||
| } | ||
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| return ZERO_BD | ||
| } | ||
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| export function getUsdPrice(pair: Pair, tokenAddress: string): BigDecimal { | ||
| if (isStablecoin(tokenAddress)) { | ||
| return BigDecimal.fromString('1.0') | ||
| } | ||
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| if (isStablecoin(pair.token0)) { | ||
| return safeDiv(pair.reserve0, pair.reserve1) | ||
| } | ||
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| if (isStablecoin(pair.token1)) { | ||
| return safeDiv(pair.reserve1, pair.reserve0) | ||
| } | ||
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| return ZERO_BD | ||
| } | ||
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| // returns [maxUsdLiquidity, bestUsdPrice] | ||
| export function getBestPrimaryUsdPrice(stablecoinPairAddresses: string[], tokenAddress: string): [BigDecimal, BigDecimal] { | ||
| if (isStablecoin(tokenAddress)) { | ||
| return [ZERO_BD, BigDecimal.fromString('1.0')] | ||
| } | ||
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| let maxUsdLiquidity = ZERO_BD | ||
| let bestUsdPrice = ZERO_BD | ||
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| for (let i = 0; i < stablecoinPairAddresses.length; i++) { | ||
| const pair = Pair.load(stablecoinPairAddresses[i])! | ||
| const primaryUsdLiquidity = getPrimaryUsdLiquidity(pair) | ||
| if (primaryUsdLiquidity.gt(maxUsdLiquidity)) { | ||
| maxUsdLiquidity = primaryUsdLiquidity | ||
| bestUsdPrice = getUsdPrice(pair, tokenAddress) | ||
| } | ||
| } | ||
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| return [maxUsdLiquidity, bestUsdPrice] | ||
| } |