UNPKG

@uniswap/smart-order-router

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import { Token } from '@uniswap/sdk-core'; import { Pair } from '@uniswap/v2-sdk'; import retry from 'async-retry'; import _ from 'lodash'; import { IUniswapV2Pair__factory } from '../../types/v2/factories/IUniswapV2Pair__factory'; import { CurrencyAmount, ID_TO_NETWORK_NAME, metric, MetricLoggerUnit, } from '../../util'; import { log } from '../../util/log'; import { poolToString } from '../../util/routes'; import { TokenValidationResult } from '../token-validator-provider'; export class V2PoolProvider { /** * Creates an instance of V2PoolProvider. * @param chainId The chain id to use. * @param multicall2Provider The multicall provider to use to get the pools. * @param tokenPropertiesProvider The token properties provider to use to get token properties. * @param retryOptions The retry options for each call to the multicall. */ constructor(chainId, multicall2Provider, tokenPropertiesProvider, retryOptions = { retries: 2, minTimeout: 50, maxTimeout: 500, }) { this.chainId = chainId; this.multicall2Provider = multicall2Provider; this.tokenPropertiesProvider = tokenPropertiesProvider; this.retryOptions = retryOptions; // Computing pool addresses is slow as it requires hashing, encoding etc. // Addresses never change so can always be cached. this.POOL_ADDRESS_CACHE = {}; } async getPools(tokenPairs, providerConfig) { var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k; const poolAddressSet = new Set(); const sortedTokenPairs = []; const sortedPoolAddresses = []; for (const tokenPair of tokenPairs) { const [tokenA, tokenB] = tokenPair; const { poolAddress, token0, token1 } = this.getPoolAddress(tokenA, tokenB); if (poolAddressSet.has(poolAddress)) { continue; } poolAddressSet.add(poolAddress); sortedTokenPairs.push([token0, token1]); sortedPoolAddresses.push(poolAddress); } log.debug(`getPools called with ${tokenPairs.length} token pairs. Deduped down to ${poolAddressSet.size}`); metric.putMetric('V2_RPC_POOL_RPC_CALL', 1, MetricLoggerUnit.None); metric.putMetric('V2GetReservesBatchSize', sortedPoolAddresses.length, MetricLoggerUnit.Count); metric.putMetric(`V2GetReservesBatchSize_${ID_TO_NETWORK_NAME(this.chainId)}`, sortedPoolAddresses.length, MetricLoggerUnit.Count); const [reservesResults, tokenPropertiesMap] = await Promise.all([ this.getPoolsData(sortedPoolAddresses, 'getReserves', providerConfig), this.tokenPropertiesProvider.getTokensProperties(this.flatten(tokenPairs), providerConfig), ]); log.info(`Got reserves for ${poolAddressSet.size} pools ${(providerConfig === null || providerConfig === void 0 ? void 0 : providerConfig.blockNumber) ? `as of block: ${await (providerConfig === null || providerConfig === void 0 ? void 0 : providerConfig.blockNumber)}.` : ``}`); const poolAddressToPool = {}; const invalidPools = []; for (let i = 0; i < sortedPoolAddresses.length; i++) { const reservesResult = reservesResults[i]; if (!(reservesResult === null || reservesResult === void 0 ? void 0 : reservesResult.success)) { const [token0, token1] = sortedTokenPairs[i]; invalidPools.push([token0, token1]); continue; } let [token0, token1] = sortedTokenPairs[i]; if (((_a = tokenPropertiesMap[token0.address.toLowerCase()]) === null || _a === void 0 ? void 0 : _a.tokenValidationResult) === TokenValidationResult.FOT) { token0 = new Token(token0.chainId, token0.address, token0.decimals, token0.symbol, token0.name, true, // at this point we know it's valid token address (_c = (_b = tokenPropertiesMap[token0.address.toLowerCase()]) === null || _b === void 0 ? void 0 : _b.tokenFeeResult) === null || _c === void 0 ? void 0 : _c.buyFeeBps, (_e = (_d = tokenPropertiesMap[token0.address.toLowerCase()]) === null || _d === void 0 ? void 0 : _d.tokenFeeResult) === null || _e === void 0 ? void 0 : _e.sellFeeBps); } if (((_f = tokenPropertiesMap[token1.address.toLowerCase()]) === null || _f === void 0 ? void 0 : _f.tokenValidationResult) === TokenValidationResult.FOT) { token1 = new Token(token1.chainId, token1.address, token1.decimals, token1.symbol, token1.name, true, // at this point we know it's valid token address (_h = (_g = tokenPropertiesMap[token1.address.toLowerCase()]) === null || _g === void 0 ? void 0 : _g.tokenFeeResult) === null || _h === void 0 ? void 0 : _h.buyFeeBps, (_k = (_j = tokenPropertiesMap[token1.address.toLowerCase()]) === null || _j === void 0 ? void 0 : _j.tokenFeeResult) === null || _k === void 0 ? void 0 : _k.sellFeeBps); } const { reserve0, reserve1 } = reservesResult.result; const pool = new Pair(CurrencyAmount.fromRawAmount(token0, reserve0.toString()), CurrencyAmount.fromRawAmount(token1, reserve1.toString())); const poolAddress = sortedPoolAddresses[i]; poolAddressToPool[poolAddress] = pool; } if (invalidPools.length > 0) { log.info({ invalidPools: _.map(invalidPools, ([token0, token1]) => `${token0.symbol}/${token1.symbol}`), }, `${invalidPools.length} pools invalid after checking their slot0 and liquidity results. Dropping.`); } const poolStrs = _.map(Object.values(poolAddressToPool), poolToString); log.debug({ poolStrs }, `Found ${poolStrs.length} valid pools`); return { getPool: (tokenA, tokenB) => { const { poolAddress } = this.getPoolAddress(tokenA, tokenB); return poolAddressToPool[poolAddress]; }, getPoolByAddress: (address) => poolAddressToPool[address], getAllPools: () => Object.values(poolAddressToPool), }; } getPoolAddress(tokenA, tokenB) { const [token0, token1] = tokenA.sortsBefore(tokenB) ? [tokenA, tokenB] : [tokenB, tokenA]; const cacheKey = `${this.chainId}/${token0.address}/${token1.address}`; const cachedAddress = this.POOL_ADDRESS_CACHE[cacheKey]; if (cachedAddress) { return { poolAddress: cachedAddress, token0, token1 }; } const poolAddress = Pair.getAddress(token0, token1); this.POOL_ADDRESS_CACHE[cacheKey] = poolAddress; return { poolAddress, token0, token1 }; } async getPoolsData(poolAddresses, functionName, providerConfig) { const { results, blockNumber } = await retry(async () => { return this.multicall2Provider.callSameFunctionOnMultipleContracts({ addresses: poolAddresses, contractInterface: IUniswapV2Pair__factory.createInterface(), functionName: functionName, providerConfig, }); }, this.retryOptions); log.debug(`Pool data fetched as of block ${blockNumber}`); return results; } // We are using ES2017. ES2019 has native flatMap support flatten(tokenPairs) { const tokens = new Array(); for (const [tokenA, tokenB] of tokenPairs) { tokens.push(tokenA); tokens.push(tokenB); } return tokens; } } //# 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