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-rw-r--r--packages/instant/src/util/gas_price_estimator.ts32
1 files changed, 25 insertions, 7 deletions
diff --git a/packages/instant/src/util/gas_price_estimator.ts b/packages/instant/src/util/gas_price_estimator.ts
index 336c4a3fa..6b15809a3 100644
--- a/packages/instant/src/util/gas_price_estimator.ts
+++ b/packages/instant/src/util/gas_price_estimator.ts
@@ -1,6 +1,11 @@
import { BigNumber, fetchAsync } from '@0x/utils';
-import { DEFAULT_GAS_PRICE, ETH_GAS_STATION_API_BASE_URL, GWEI_IN_WEI } from '../constants';
+import {
+ DEFAULT_ESTIMATED_TRANSACTION_TIME_MS,
+ DEFAULT_GAS_PRICE,
+ ETH_GAS_STATION_API_BASE_URL,
+ GWEI_IN_WEI,
+} from '../constants';
interface EthGasStationResult {
average: number;
@@ -16,18 +21,25 @@ interface EthGasStationResult {
safeLow: number;
}
-const fetchFastAmountInWeiAsync = async () => {
+interface GasInfo {
+ gasPriceInWei: BigNumber;
+ estimatedTimeMs: number;
+}
+
+const fetchFastAmountInWeiAsync = async (): Promise<GasInfo> => {
const res = await fetchAsync(`${ETH_GAS_STATION_API_BASE_URL}/json/ethgasAPI.json`);
const gasInfo = (await res.json()) as EthGasStationResult;
// Eth Gas Station result is gwei * 10
const gasPriceInGwei = new BigNumber(gasInfo.fast / 10);
- return gasPriceInGwei.mul(GWEI_IN_WEI);
+ // Time is in minutes
+ const estimatedTimeMs = gasInfo.fastWait * 60 * 1000; // Minutes to MS
+ return { gasPriceInWei: gasPriceInGwei.mul(GWEI_IN_WEI), estimatedTimeMs };
};
export class GasPriceEstimator {
- private _lastFetched?: BigNumber;
- public async getFastAmountInWeiAsync(): Promise<BigNumber> {
- let fetchedAmount: BigNumber | undefined;
+ private _lastFetched?: GasInfo;
+ public async getGasInfoAsync(): Promise<GasInfo> {
+ let fetchedAmount: GasInfo | undefined;
try {
fetchedAmount = await fetchFastAmountInWeiAsync();
} catch {
@@ -38,7 +50,13 @@ export class GasPriceEstimator {
this._lastFetched = fetchedAmount;
}
- return fetchedAmount || this._lastFetched || DEFAULT_GAS_PRICE;
+ return (
+ fetchedAmount ||
+ this._lastFetched || {
+ gasPriceInWei: DEFAULT_GAS_PRICE,
+ estimatedTimeMs: DEFAULT_ESTIMATED_TRANSACTION_TIME_MS,
+ }
+ );
}
}
export const gasPriceEstimator = new GasPriceEstimator();