@xspswap/smart-order-router
Version:
XSwap Protocol V3 Smart Order Router
33 lines • 2.53 kB
JavaScript
import { log } from '../util/log';
/**
* Provider for getting gas price, with functionality for caching the results.
*
* @export
* @class CachingV3SubgraphProvider
*/
export class CachingGasStationProvider {
/**
* Creates an instance of CachingGasStationProvider.
* @param chainId The chain id to use.
* @param gasPriceProvider The provider to use to get the gas price when not in the cache.
* @param cache Cache instance to hold cached pools.
*/
constructor(chainId, gasPriceProvider, cache) {
this.chainId = chainId;
this.gasPriceProvider = gasPriceProvider;
this.cache = cache;
this.GAS_KEY = (chainId) => `gasPrice-${chainId}`;
}
async getGasPrice() {
const cachedGasPrice = await this.cache.get(this.GAS_KEY(this.chainId));
if (cachedGasPrice) {
log.info({ cachedGasPrice }, `Got gas station price from local cache: ${cachedGasPrice.gasPriceWei}.`);
return cachedGasPrice;
}
log.info('Gas station price local cache miss.');
const gasPrice = await this.gasPriceProvider.getGasPrice();
await this.cache.set(this.GAS_KEY(this.chainId), gasPrice);
return gasPrice;
}
}
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