From f9eba65aee8e71de609801e640de4101af9645e6 Mon Sep 17 00:00:00 2001
From: Steve Klebanoff <steve.klebnaoff@gmail.com>
Date: Mon, 29 Oct 2018 20:06:31 -0700
Subject: return estimated state

---
 packages/instant/src/components/buy_button.tsx      |  4 ++--
 packages/instant/src/components/zero_ex_instant.tsx |  2 +-
 packages/instant/src/types.ts                       |  1 +
 packages/instant/src/util/gas_price_estimator.ts    | 19 +++++++++++++------
 4 files changed, 17 insertions(+), 9 deletions(-)

(limited to 'packages')

diff --git a/packages/instant/src/components/buy_button.tsx b/packages/instant/src/components/buy_button.tsx
index 93bd8e635..36cc32dbc 100644
--- a/packages/instant/src/components/buy_button.tsx
+++ b/packages/instant/src/components/buy_button.tsx
@@ -57,9 +57,9 @@ export class BuyButton extends React.Component<BuyButtonProps> {
         }
 
         let txHash: string | undefined;
-        const gasPrice = await gasPriceEstimator.getFastAmountInWeiAsync();
+        const gasInfo = await gasPriceEstimator.getGasInfoAsync();
         try {
-            txHash = await assetBuyer.executeBuyQuoteAsync(buyQuote, { takerAddress, gasPrice });
+            txHash = await assetBuyer.executeBuyQuoteAsync(buyQuote, { takerAddress, gasPrice: gasInfo.gasPriceInWei });
         } catch (e) {
             if (e instanceof Error) {
                 if (e.message === AssetBuyerError.SignatureRequestDenied) {
diff --git a/packages/instant/src/components/zero_ex_instant.tsx b/packages/instant/src/components/zero_ex_instant.tsx
index d54dfc153..365c1610f 100644
--- a/packages/instant/src/components/zero_ex_instant.tsx
+++ b/packages/instant/src/components/zero_ex_instant.tsx
@@ -83,7 +83,7 @@ export class ZeroExInstant extends React.Component<ZeroExInstantProps> {
         // warm up the gas price estimator cache just in case we can't
         // grab the gas price estimate when submitting the transaction
         // tslint:disable-next-line:no-floating-promises
-        gasPriceEstimator.getFastAmountInWeiAsync();
+        gasPriceEstimator.getGasInfoAsync();
 
         // tslint:disable-next-line:no-floating-promises
         this._flashErrorIfWrongNetwork();
diff --git a/packages/instant/src/types.ts b/packages/instant/src/types.ts
index 336465e43..4631c9cae 100644
--- a/packages/instant/src/types.ts
+++ b/packages/instant/src/types.ts
@@ -22,6 +22,7 @@ interface OrderStatePreTx {
 interface OrderStatePostTx {
     processState: OrderProcessState.PROCESSING | OrderProcessState.SUCCESS | OrderProcessState.FAILURE;
     txHash: string;
+    estimatedTimeMs?: number;
 }
 export type OrderState = OrderStatePreTx | OrderStatePostTx;
 
diff --git a/packages/instant/src/util/gas_price_estimator.ts b/packages/instant/src/util/gas_price_estimator.ts
index 336c4a3fa..0552ccde1 100644
--- a/packages/instant/src/util/gas_price_estimator.ts
+++ b/packages/instant/src/util/gas_price_estimator.ts
@@ -16,18 +16,25 @@ 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 +45,7 @@ export class GasPriceEstimator {
             this._lastFetched = fetchedAmount;
         }
 
-        return fetchedAmount || this._lastFetched || DEFAULT_GAS_PRICE;
+        return fetchedAmount || this._lastFetched || { gasPriceInWei: DEFAULT_GAS_PRICE, estimatedTimeMs: undefined };
     }
 }
 export const gasPriceEstimator = new GasPriceEstimator();
-- 
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