wip: BuyQuote heartbeat

packages/instant/src/components/zero_ex_instant_provider.tsx

@@ -5,7 +5,7 @@ import * as _ from 'lodash';
 import * as React from 'react';
 import { Provider as ReduxProvider } from 'react-redux';
 
-import { ACCOUNT_UPDATE_INTERVAL_TIME_MS } from '../constants';
+import { ACCOUNT_UPDATE_INTERVAL_TIME_MS, BUY_QUOTE_UPDATE_INTERVAL_TIME_MS } from '../constants';
 import { SelectedAssetThemeProvider } from '../containers/selected_asset_theme_provider';
 import { asyncData } from '../redux/async_data';
 import { DEFAULT_STATE, DefaultState, State } from '../redux/reducer';
@@ -15,7 +15,7 @@ import { AffiliateInfo, AssetMetaData, Network, OrderSource } from '../types';
 import { assetUtils } from '../util/asset';
 import { errorFlasher } from '../util/error_flasher';
 import { gasPriceEstimator } from '../util/gas_price_estimator';
-import { generateAccountHeartbeater, Heartbeater } from '../util/hearbeats';
+import { generateAccountHeartbeater, Heartbeater, generateBuyQuoteHeartbeater } from '../util/hearbeats';
 import { providerStateFactory } from '../util/provider_state_factory';
 
 fonts.include();
@@ -40,6 +40,8 @@ export interface ZeroExInstantProviderOptionalProps {
 export class ZeroExInstantProvider extends React.Component<ZeroExInstantProviderProps> {
     private readonly _store: Store;
     private _accountUpdateHeartbeat?: Heartbeater;
+    private _buyQuoteHeartbeat?: Heartbeater;
+
     // TODO(fragosti): Write tests for this beast once we inject a provider.
     private static _mergeDefaultStateWithProps(
         props: ZeroExInstantProviderProps,
@@ -101,6 +103,10 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
         this._accountUpdateHeartbeat = generateAccountHeartbeater(this._store);
         this._accountUpdateHeartbeat.start(ACCOUNT_UPDATE_INTERVAL_TIME_MS);
 
+        // TODO assign and stop on unmount
+        this._buyQuoteHeartbeat = generateBuyQuoteHeartbeater(this._store);
+        this._buyQuoteHeartbeat.start(BUY_QUOTE_UPDATE_INTERVAL_TIME_MS);
+
         // 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
@@ -112,6 +118,9 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
         if (this._accountUpdateHeartbeat) {
             this._accountUpdateHeartbeat.stop();
         }
+        if (this._buyQuoteHeartbeat) {
+            this._buyQuoteHeartbeat.stop();
+        }
     }
     public render(): React.ReactNode {
         return (

packages/instant/src/constants.ts

@@ -11,6 +11,7 @@ export const GWEI_IN_WEI = new BigNumber(1000000000);
 export const ONE_SECOND_MS = 1000;
 export const ONE_MINUTE_MS = ONE_SECOND_MS * 60;
 export const ACCOUNT_UPDATE_INTERVAL_TIME_MS = ONE_SECOND_MS * 15;
+export const BUY_QUOTE_UPDATE_INTERVAL_TIME_MS = ONE_SECOND_MS * 15;
 export const DEFAULT_GAS_PRICE = GWEI_IN_WEI.mul(6);
 export const DEFAULT_ESTIMATED_TRANSACTION_TIME_MS = ONE_MINUTE_MS * 2;
 export const ETH_GAS_STATION_API_BASE_URL = 'https://ethgasstation.info';

packages/instant/src/util/buy_quote_fetcher.ts

@@ -1,5 +1,6 @@
 // TODO: rename file and export object
 import { AssetBuyer, AssetBuyerError, BuyQuote } from '@0x/asset-buyer';
+import { AssetProxyId } from '@0x/types';
 import { BigNumber } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
 import * as _ from 'lodash';
@@ -7,6 +8,7 @@ import { Dispatch } from 'redux';
 import { oc } from 'ts-optchain';
 
 import { Action, actions } from '../redux/actions';
+import { State } from '../redux/reducer';
 import { AffiliateInfo, ERC20Asset } from '../types';
 import { assetUtils } from '../util/asset';
 
@@ -53,3 +55,19 @@ export const updateBuyQuoteOrFlashErrorAsync = async (
     // invalidate the last buy quote.
     dispatch(actions.updateLatestBuyQuote(newBuyQuote));
 };
+
+export const updateBuyQuoteOrFlashErrorAsyncForState = async (state: State, dispatch: Dispatch<Action>) => {
+    const { selectedAsset, selectedAssetAmount, affiliateInfo } = state;
+    const assetBuyer = state.providerState.assetBuyer;
+
+    if (selectedAsset && selectedAssetAmount && selectedAsset.metaData.assetProxyId === AssetProxyId.ERC20) {
+        // TODO: maybe dont do in the case of an error showing
+        updateBuyQuoteOrFlashErrorAsync(
+            assetBuyer,
+            selectedAsset as ERC20Asset, // TODO: better way to do this?
+            selectedAssetAmount,
+            dispatch,
+            affiliateInfo,
+        );
+    }
+};

packages/instant/src/util/hearbeats.ts

@@ -1,9 +1,14 @@
 // TODO: rename file
 
 import * as _ from 'lodash';
+import { Dispatch } from 'redux';
 
-import { asyncData } from './../redux/async_data';
+import { Action } from '../redux/actions';
-import { Store } from './../redux/store';
+import { asyncData } from '../redux/async_data';
+import { State } from '../redux/reducer';
+import { Store } from '../redux/store';
+
+import { updateBuyQuoteOrFlashErrorAsyncForState } from './buy_quote_fetcher';
 
 type HeartbeatableFunction = () => Promise<void>;
 export class Heartbeater {
@@ -39,7 +44,7 @@ export class Heartbeater {
 
         this._pendingRequest = true;
         try {
-            this._performingFunctionAsync();
+            await this._performingFunctionAsync();
         } finally {
             this._pendingRequest = false;
         }
@@ -51,3 +56,10 @@ export const generateAccountHeartbeater = (store: Store): Heartbeater => {
         await asyncData.fetchAccountInfoAndDispatchToStore(store, { setLoading: false });
     });
 };
+
+export const generateBuyQuoteHeartbeater = (store: Store): Heartbeater => {
+    return new Heartbeater(async () => {
+        await updateBuyQuoteOrFlashErrorAsyncForState(store.getState(), store.dispatch);
+        return Promise.resolve();
+    });
+};