@uniswap/smart-order-router
Version:
Uniswap Smart Order Router
41 lines • 3.49 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.CachingGasStationProvider = void 0;
const log_1 = require("../util/log");
const gas_price_provider_1 = require("./gas-price-provider");
/**
* Provider for getting gas price, with functionality for caching the results.
*
* @export
* @class CachingV3SubgraphProvider
*/
class CachingGasStationProvider extends gas_price_provider_1.IGasPriceProvider {
/**
* 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) {
super();
this.chainId = chainId;
this.gasPriceProvider = gasPriceProvider;
this.cache = cache;
this.GAS_KEY = (chainId, blockNumber) => `gasPrice-${chainId}-${blockNumber}`;
}
async getGasPrice(latestBlockNumber, requestBlockNumber) {
// If block number is specified in the request, we have to use that block number find any potential cache hits.
// Otherwise, we can use the latest block number.
const targetBlockNumber = requestBlockNumber !== null && requestBlockNumber !== void 0 ? requestBlockNumber : latestBlockNumber;
const cachedGasPrice = await this.cache.get(this.GAS_KEY(this.chainId, targetBlockNumber));
if (cachedGasPrice) {
log_1.log.info({ cachedGasPrice }, `Got gas station price from local cache: ${cachedGasPrice.gasPriceWei}.`);
return cachedGasPrice;
}
const gasPrice = await this.gasPriceProvider.getGasPrice(latestBlockNumber, requestBlockNumber);
await this.cache.set(this.GAS_KEY(this.chainId, targetBlockNumber), gasPrice);
return gasPrice;
}
}
exports.CachingGasStationProvider = CachingGasStationProvider;
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