feat(instant): Heartbeat for updating account info

packages/instant/src/components/zero_ex_instant_provider.tsx

@@ -5,6 +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 { SelectedAssetThemeProvider } from '../containers/selected_asset_theme_provider';
 import { asyncData } from '../redux/async_data';
 import { DEFAULT_STATE, DefaultState, State } from '../redux/reducer';
@@ -14,6 +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 { AccountUpdateHeartbeat } from '../util/hearbeats';
 import { providerStateFactory } from '../util/provider_state_factory';
 
 fonts.include();
@@ -37,6 +39,7 @@ export interface ZeroExInstantProviderOptionalProps {
 
 export class ZeroExInstantProvider extends React.Component<ZeroExInstantProviderProps> {
     private readonly _store: Store;
+    private _accountUpdateHeartbeat?: AccountUpdateHeartbeat;
     // TODO(fragosti): Write tests for this beast once we inject a provider.
     private static _mergeDefaultStateWithProps(
         props: ZeroExInstantProviderProps,
@@ -93,7 +96,10 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
             asyncData.fetchAvailableAssetDatasAndDispatchToStore(this._store);
         }
         // tslint:disable-next-line:no-floating-promises
-        asyncData.fetchAccountInfoAndDispatchToStore(this._store);
+        // asyncData.fetchAccountInfoAndDispatchToStore(this._store);
+        this._accountUpdateHeartbeat = new AccountUpdateHeartbeat();
+        this._accountUpdateHeartbeat.start(this._store, ACCOUNT_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
@@ -101,6 +107,11 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
         // tslint:disable-next-line:no-floating-promises
         this._flashErrorIfWrongNetwork();
     }
+    public componentWillUnmount(): void {
+        if (this._accountUpdateHeartbeat) {
+            this._accountUpdateHeartbeat.stop();
+        }
+    }
     public render(): React.ReactNode {
         return (
             <ReduxProvider store={this._store}>

packages/instant/src/constants.ts

@@ -10,6 +10,7 @@ export const WEB_3_WRAPPER_TRANSACTION_FAILED_ERROR_MSG_PREFIX = 'Transaction fa
 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 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/redux/async_data.ts

@@ -34,10 +34,10 @@ export const asyncData = {
             store.dispatch(actions.setAvailableAssets([]));
         }
     },
-    fetchAccountInfoAndDispatchToStore: async (store: Store) => {
+    fetchAccountInfoAndDispatchToStore: async (store: Store, options = { setLoading: true }) => {
         const { providerState } = store.getState();
         const web3Wrapper = providerState.web3Wrapper;
-        if (providerState.account.state !== AccountState.Loading) {
+        if (options.setLoading && providerState.account.state !== AccountState.Loading) {
             store.dispatch(actions.setAccountStateLoading());
         }
         let availableAddresses: string[];

packages/instant/src/util/hearbeats.ts

@@ -0,0 +1,47 @@
+import * as _ from 'lodash';
+
+import { asyncData } from './../redux/async_data';
+import { Store } from './../redux/store';
+
+export class AccountUpdateHeartbeat {
+    private _intervalId?: number;
+    private _pendingRequest?: boolean;
+    private _store?: Store;
+
+    public start(store: Store, intervalTimeMs: number): void {
+        if (!_.isUndefined(this._intervalId)) {
+            throw new Error('Heartbeat is running, please stop before restarting');
+        }
+        this._store = store;
+        // Kick off initial first request
+        this._performActionAsync(true);
+        // Set interval for heartbeat
+        this._intervalId = window.setInterval(this._performActionAsync.bind(this, false), intervalTimeMs);
+    }
+
+    public stop(): void {
+        if (!_.isUndefined(this._intervalId)) {
+            window.clearInterval(this._intervalId);
+            this._resetState();
+        }
+    }
+
+    private _resetState(): void {
+        this._intervalId = undefined;
+        this._pendingRequest = false;
+        this._store = undefined;
+    }
+
+    private async _performActionAsync(setLoading: boolean): Promise<void> {
+        if (this._pendingRequest || _.isUndefined(this._store)) {
+            return;
+        }
+
+        this._pendingRequest = true;
+        try {
+            await asyncData.fetchAccountInfoAndDispatchToStore(this._store, { setLoading });
+        } finally {
+            this._pendingRequest = false;
+        }
+    }
+}