@maxosllc/smart-order-router
Version:
BlockDAG Smart Order Router
58 lines • 4.55 kB
JavaScript
import retry from 'async-retry';
import Timeout from 'await-timeout';
import axios from 'axios';
import { log } from '../util/log';
/**
* Gets subgraph pools from a URI. The URI shoudl contain a JSON
* stringified array of V2SubgraphPool objects or V3SubgraphPool
* objects.
*
* @export
* @class URISubgraphProvider
* @template TSubgraphPool
*/
export class URISubgraphProvider {
constructor(chainId, uri, timeout = 6000, retries = 2) {
this.chainId = chainId;
this.uri = uri;
this.timeout = timeout;
this.retries = retries;
}
async getPools() {
log.info({ uri: this.uri }, `About to get subgraph pools from URI ${this.uri}`);
let allPools = [];
await retry(async () => {
const timeout = new Timeout();
const timerPromise = timeout.set(this.timeout).then(() => {
throw new Error(`Timed out getting pools from subgraph: ${this.timeout}`);
});
let response;
/* eslint-disable no-useless-catch */
try {
response = await Promise.race([axios.get(this.uri), timerPromise]);
}
catch (err) {
throw err;
}
finally {
timeout.clear();
}
/* eslint-enable no-useless-catch */
const { data: poolsBuffer, status } = response;
if (status != 200) {
log.error({ response }, `Unabled to get pools from ${this.uri}.`);
throw new Error(`Unable to get pools from ${this.uri}`);
}
const pools = poolsBuffer;
log.info({ uri: this.uri, chain: this.chainId }, `Got subgraph pools from uri. Num: ${pools.length}`);
allPools = pools;
}, {
retries: this.retries,
onRetry: (err, retry) => {
log.info({ err }, `Failed to get pools from uri ${this.uri}. Retry attempt: ${retry}`);
},
});
return allPools;
}
}
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