@maxosllc/smart-order-router
Version:
BlockDAG Smart Order Router
102 lines • 8.13 kB
JavaScript
import { Pool } from '@uniswap/v3-sdk';
import { computePoolAddress } from './compute-pool-address';
import retry from 'async-retry';
import { IUniswapV3PoolState__factory } from '../../types/v3/factories/IUniswapV3PoolState__factory';
import { V3_CORE_FACTORY_ADDRESSES } from '../../util/addresses';
import { log } from '../../util/log';
import { PoolProvider } from '../pool-provider';
export class V3PoolProvider extends PoolProvider {
/**
* Creates an instance of V4PoolProvider.
* @param chainId The chain id to use.
* @param multicall2Provider The multicall provider to use to get the pools.
* @param retryOptions The retry options for each call to the multicall.
*/
constructor(chainId, multicall2Provider, retryOptions = {
retries: 2,
minTimeout: 50,
maxTimeout: 500,
}) {
super(chainId, multicall2Provider, 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) {
return await super.getPoolsInternal(tokenPairs, providerConfig);
}
getPoolAddress(tokenA, tokenB, feeAmount) {
const { poolIdentifier, currency0, currency1 } = this.getPoolIdentifier([
tokenA,
tokenB,
feeAmount,
]);
return {
poolAddress: poolIdentifier,
token0: currency0,
token1: currency1,
};
}
getLiquidityFunctionName() {
return 'liquidity';
}
getSlot0FunctionName() {
return 'slot0';
}
async getPoolsData(poolAddresses, functionName, providerConfig) {
const { results, blockNumber } = await retry(async () => {
return this.multicall2Provider.callSameFunctionOnMultipleContracts({
addresses: poolAddresses,
contractInterface: IUniswapV3PoolState__factory.createInterface(),
functionName: functionName,
providerConfig,
});
}, this.retryOptions);
log.debug(`Pool data fetched as of block ${blockNumber}`);
return results;
}
getPoolIdentifier(pool) {
const [tokenA, tokenB, feeAmount] = pool;
const [token0, token1] = tokenA.sortsBefore(tokenB)
? [tokenA, tokenB]
: [tokenB, tokenA];
const cacheKey = `${this.chainId}/${token0.address}/${token1.address}/${feeAmount}`;
const cachedAddress = this.POOL_ADDRESS_CACHE[cacheKey];
if (cachedAddress) {
return {
poolIdentifier: cachedAddress,
currency0: token0,
currency1: token1,
};
}
const poolAddress = computePoolAddress({
factoryAddress: V3_CORE_FACTORY_ADDRESSES[this.chainId],
tokenA: token0,
tokenB: token1,
fee: feeAmount,
initCodeHashManualOverride: undefined,
chainId: this.chainId,
});
this.POOL_ADDRESS_CACHE[cacheKey] = poolAddress;
return {
poolIdentifier: poolAddress,
currency0: token0,
currency1: token1,
};
}
instantiatePool(pool, slot0, liquidity) {
const [token0, token1, feeAmount] = pool;
return new Pool(token0, token1, feeAmount, slot0.sqrtPriceX96.toString(), liquidity.toString(), slot0.tick);
}
instantiatePoolAccessor(poolIdentifierToPool) {
return {
getPool: (tokenA, tokenB, feeAmount) => {
const { poolAddress } = this.getPoolAddress(tokenA, tokenB, feeAmount);
return poolIdentifierToPool[poolAddress];
},
getPoolByAddress: (address) => poolIdentifierToPool[address],
getAllPools: () => Object.values(poolIdentifierToPool),
};
}
}
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