@maxosllc/smart-order-router
Version:
BlockDAG Smart Order Router
176 lines • 18 kB
JavaScript
import { ChainId } from '../../../src/util/chains';
import retry from 'async-retry';
import Timeout from 'await-timeout';
import { gql, GraphQLClient } from 'graphql-request';
import _ from 'lodash';
import { log } from '../../util/log';
import { metric } from '../../util/metric';
const SUBGRAPH_URL_BY_CHAIN = {
[ChainId.MAINNET]: 'https://api.thegraph.com/subgraphs/name/ianlapham/uniswap-v2-dev',
};
const PAGE_SIZE = 1000; // 1k is max possible query size from subgraph.
export class V2SubgraphProvider {
constructor(chainId, retries = 2, timeout = 360000, rollback = true, pageSize = PAGE_SIZE, trackedEthThreshold = 0.025, untrackedUsdThreshold = Number.MAX_VALUE, subgraphUrlOverride) {
var _a;
this.chainId = chainId;
this.retries = retries;
this.timeout = timeout;
this.rollback = rollback;
this.pageSize = pageSize;
this.trackedEthThreshold = trackedEthThreshold;
this.untrackedUsdThreshold = untrackedUsdThreshold;
this.subgraphUrlOverride = subgraphUrlOverride;
const subgraphUrl = (_a = this.subgraphUrlOverride) !== null && _a !== void 0 ? _a : SUBGRAPH_URL_BY_CHAIN[this.chainId];
if (!subgraphUrl) {
throw new Error(`No subgraph url for chain id: ${this.chainId}`);
}
this.client = new GraphQLClient(subgraphUrl);
}
async getPools(_tokenIn, _tokenOut, providerConfig) {
const beforeAll = Date.now();
let blockNumber = (providerConfig === null || providerConfig === void 0 ? void 0 : providerConfig.blockNumber)
? await providerConfig.blockNumber
: undefined;
// Due to limitations with the Subgraph API this is the only way to parameterize the query.
const query2 = gql `
query getPools($pageSize: Int!, $id: String) {
pairs(
first: $pageSize
${blockNumber ? `block: { number: ${blockNumber} }` : ``}
where: { id_gt: $id }
) {
id
token0 { id, symbol }
token1 { id, symbol }
totalSupply
trackedReserveETH
reserveETH
reserveUSD
}
}
`;
let pools = [];
log.info(`Getting V2 pools from the subgraph with page size ${this.pageSize}${(providerConfig === null || providerConfig === void 0 ? void 0 : providerConfig.blockNumber)
? ` as of block ${providerConfig === null || providerConfig === void 0 ? void 0 : providerConfig.blockNumber}`
: ''}.`);
let outerRetries = 0;
await retry(async () => {
const timeout = new Timeout();
const getPools = async () => {
let lastId = '';
let pairs = [];
let pairsPage = [];
// metrics variables
let totalPages = 0;
let retries = 0;
do {
totalPages += 1;
await retry(async () => {
const before = Date.now();
const poolsResult = await this.client.request(query2, {
pageSize: this.pageSize,
id: lastId,
});
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.paginate.latency`, Date.now() - before);
pairsPage = poolsResult.pairs;
pairs = pairs.concat(pairsPage);
lastId = pairs[pairs.length - 1].id;
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.paginate.pageSize`, pairsPage.length);
}, {
retries: this.retries,
onRetry: (err, retry) => {
pools = [];
retries += 1;
log.error({ err, lastId }, `Failed request for page of pools from subgraph. Retry attempt: ${retry}. LastId: ${lastId}`);
},
});
} while (pairsPage.length > 0);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.paginate`, totalPages);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.pairs.length`, pairs.length);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.paginate.retries`, retries);
return pairs;
};
try {
const getPoolsPromise = getPools();
const timerPromise = timeout.set(this.timeout).then(() => {
throw new Error(`Timed out getting pools from subgraph: ${this.timeout}`);
});
pools = await Promise.race([getPoolsPromise, timerPromise]);
return;
}
catch (err) {
log.error({ err }, 'Error fetching V2 Subgraph Pools.');
throw err;
}
finally {
timeout.clear();
}
}, {
retries: this.retries,
onRetry: (err, retry) => {
outerRetries += 1;
if (this.rollback &&
blockNumber &&
_.includes(err.message, 'indexed up to')) {
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.indexError`, 1);
blockNumber = blockNumber - 10;
log.info(`Detected subgraph indexing error. Rolled back block number to: ${blockNumber}`);
}
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.timeout`, 1);
pools = [];
log.info({ err }, `Failed to get pools from subgraph. Retry attempt: ${retry}`);
},
});
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.retries`, outerRetries);
// Filter pools that have tracked reserve ETH less than threshold.
// trackedReserveETH filters pools that do not involve a pool from this allowlist:
// https://github.com/Uniswap/v2-subgraph/blob/7c82235cad7aee4cfce8ea82f0030af3d224833e/src/mappings/pricing.ts#L43
// Which helps filter pools with manipulated prices/liquidity.
// TODO: Remove. Temporary fix to ensure tokens without trackedReserveETH are in the list.
const FEI = '0x956f47f50a910163d8bf957cf5846d573e7f87ca';
const tracked = pools.filter((pool) => pool.token0.id == FEI ||
pool.token1.id == FEI ||
this.isVirtualPairBaseV2Pool(pool) ||
parseFloat(pool.trackedReserveETH) > this.trackedEthThreshold);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.filter.length`, tracked.length);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.filter.percent`, (tracked.length / pools.length) * 100);
const beforeFilter = Date.now();
const poolsSanitized = pools
.filter((pool) => {
return (pool.token0.id == FEI ||
pool.token1.id == FEI ||
this.isVirtualPairBaseV2Pool(pool) ||
parseFloat(pool.trackedReserveETH) > this.trackedEthThreshold ||
parseFloat(pool.reserveUSD) > this.untrackedUsdThreshold);
})
.map((pool) => {
return {
id: pool.id.toLowerCase(),
token0: {
id: pool.token0.id.toLowerCase(),
},
token1: {
id: pool.token1.id.toLowerCase(),
},
supply: parseFloat(pool.totalSupply),
reserve: parseFloat(pool.trackedReserveETH),
reserveUSD: parseFloat(pool.reserveUSD),
};
});
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.filter.latency`, Date.now() - beforeFilter);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.untracked.length`, poolsSanitized.length);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.untracked.percent`, (poolsSanitized.length / pools.length) * 100);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools`, 1);
metric.putMetric(`V2SubgraphProvider.chain_${this.chainId}.getPools.latency`, Date.now() - beforeAll);
log.info(`Got ${pools.length} V2 pools from the subgraph. ${poolsSanitized.length} after filtering`);
return poolsSanitized;
}
// This method checks if a given pool contains the VIRTUAL token.
isVirtualPairBaseV2Pool(pool) {
const virtualTokenAddress = '0x0b3e328455c4059eeb9e3f84b5543f74e24e7e1b'.toLowerCase();
return (this.chainId === ChainId.BASE &&
(pool.token0.id.toLowerCase() === virtualTokenAddress ||
pool.token1.id.toLowerCase() === virtualTokenAddress));
}
}
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