7 files changed, 162 insertions, 5 deletions
diff --git a/packages/instant/src/components/zero_ex_instant_provider.tsx b/packages/instant/src/components/zero_ex_instant_provider.tsx
index cceb44377..34257d25f 100644
--- a/packages/instant/src/components/zero_ex_instant_provider.tsx
+++ b/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, 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';
@@ -14,6 +15,8 @@ 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 { Heartbeater } from '../util/heartbeater';
+import { generateAccountHeartbeater, generateBuyQuoteHeartbeater } from '../util/heartbeater_factory';
 import { providerStateFactory } from '../util/provider_state_factory';
 
 fonts.include();
@@ -37,6 +40,9 @@ 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,
@@ -93,9 +99,14 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
             asyncData.fetchAvailableAssetDatasAndDispatchToStore(this._store);
         }
         // tslint:disable-next-line:no-floating-promises
-        asyncData.fetchAccountInfoAndDispatchToStore(this._store);
-        // tslint:disable-next-line:no-floating-promises
-        asyncData.fetchCurrentBuyQuoteAndDispatchToStore(this._store);
+        // asyncData.fetchAccountInfoAndDispatchToStore(this._store);
+
+        this._accountUpdateHeartbeat = generateAccountHeartbeater(this._store);
+        this._accountUpdateHeartbeat.start(ACCOUNT_UPDATE_INTERVAL_TIME_MS);
+
+        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
@@ -103,6 +114,14 @@ 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();
+        }
+        if (this._buyQuoteHeartbeat) {
+            this._buyQuoteHeartbeat.stop();
+        }
+    }
     public render(): React.ReactNode {
         return (
             <ReduxProvider store={this._store}>
diff --git a/packages/instant/src/constants.ts b/packages/instant/src/constants.ts
index b5c4f96e4..37320e21d 100644
--- a/packages/instant/src/constants.ts
+++ b/packages/instant/src/constants.ts
@@ -11,6 +11,8 @@ 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 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';
diff --git a/packages/instant/src/containers/selected_erc20_asset_amount_input.ts b/packages/instant/src/containers/selected_erc20_asset_amount_input.ts
index c550aef04..74713327c 100644
--- a/packages/instant/src/containers/selected_erc20_asset_amount_input.ts
+++ b/packages/instant/src/containers/selected_erc20_asset_amount_input.ts
@@ -11,6 +11,7 @@ import { Action, actions } from '../redux/actions';
 import { State } from '../redux/reducer';
 import { ColorOption } from '../style/theme';
 import { AffiliateInfo, ERC20Asset, OrderProcessState } from '../types';
+import { updateBuyQuoteOrFlashErrorAsync } from '../util/buy_quote_fetcher';
 import { buyQuoteUpdater } from '../util/buy_quote_updater';
 
 export interface SelectedERC20AssetAmountInputProps {
@@ -67,6 +68,7 @@ const mapStateToProps = (state: State, _ownProps: SelectedERC20AssetAmountInputP
     };
 };
 
+// TODO: change to set pending to true
 const debouncedUpdateBuyQuoteAsync = _.debounce(buyQuoteUpdater.updateBuyQuoteAsync.bind(buyQuoteUpdater), 200, {
     trailing: true,
 });
diff --git a/packages/instant/src/redux/async_data.ts b/packages/instant/src/redux/async_data.ts
index a8f632009..a50f24cba 100644
--- a/packages/instant/src/redux/async_data.ts
+++ b/packages/instant/src/redux/async_data.ts
@@ -36,10 +36,10 @@ 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[];
diff --git a/packages/instant/src/util/buy_quote_fetcher.ts b/packages/instant/src/util/buy_quote_fetcher.ts
new file mode 100644
index 000000000..22ce835e8
--- /dev/null
+++ b/packages/instant/src/util/buy_quote_fetcher.ts
@@ -0,0 +1,75 @@
+// TODO: rename file and export object
+// TODO: delete this
+
+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';
+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';
+
+import { errorFlasher } from './error_flasher';
+
+export const updateBuyQuoteOrFlashErrorAsync = async (
+    assetBuyer: AssetBuyer,
+    asset: ERC20Asset,
+    assetAmount: BigNumber,
+    dispatch: Dispatch<Action>,
+    affiliateInfo?: AffiliateInfo,
+) => {
+    // get a new buy quote.
+    const baseUnitValue = Web3Wrapper.toBaseUnitAmount(assetAmount, asset.metaData.decimals);
+
+    const feePercentage = oc(affiliateInfo).feePercentage();
+    let newBuyQuote: BuyQuote | undefined;
+    try {
+        newBuyQuote = await assetBuyer.getBuyQuoteAsync(asset.assetData, baseUnitValue, { feePercentage });
+    } catch (error) {
+        dispatch(actions.setQuoteRequestStateFailure());
+        let errorMessage;
+        if (error.message === AssetBuyerError.InsufficientAssetLiquidity) {
+            const assetName = assetUtils.bestNameForAsset(asset, 'of this asset');
+            errorMessage = `Not enough ${assetName} available`;
+        } else if (error.message === AssetBuyerError.InsufficientZrxLiquidity) {
+            errorMessage = 'Not enough ZRX available';
+        } else if (
+            error.message === AssetBuyerError.StandardRelayerApiError ||
+            error.message.startsWith(AssetBuyerError.AssetUnavailable)
+        ) {
+            const assetName = assetUtils.bestNameForAsset(asset, 'This asset');
+            errorMessage = `${assetName} is currently unavailable`;
+        }
+        if (!_.isUndefined(errorMessage)) {
+            errorFlasher.flashNewErrorMessage(dispatch, errorMessage);
+        } else {
+            throw error;
+        }
+        return;
+    }
+    // We have a successful new buy quote
+    errorFlasher.clearError(dispatch);
+    // 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,
+        );
+    }
+};
diff --git a/packages/instant/src/util/heartbeater.ts b/packages/instant/src/util/heartbeater.ts
new file mode 100644
index 000000000..bb4e99383
--- /dev/null
+++ b/packages/instant/src/util/heartbeater.ts
@@ -0,0 +1,42 @@
+import * as _ from 'lodash';
+
+type HeartbeatableFunction = () => Promise<void>;
+export class Heartbeater {
+    private _intervalId?: number;
+    private _hasPendingRequest: boolean;
+    private _performFunction: HeartbeatableFunction;
+
+    public constructor(_performingFunctionAsync: HeartbeatableFunction) {
+        this._performFunction = _performingFunctionAsync;
+        this._hasPendingRequest = false;
+    }
+
+    public start(intervalTimeMs: number): void {
+        if (!_.isUndefined(this._intervalId)) {
+            throw new Error('Heartbeat is running, please stop before restarting');
+        }
+        this._trackAndPerformAsync();
+        this._intervalId = window.setInterval(this._trackAndPerformAsync.bind(this), intervalTimeMs);
+    }
+
+    public stop(): void {
+        if (this._intervalId) {
+            window.clearInterval(this._intervalId);
+        }
+        this._intervalId = undefined;
+        this._hasPendingRequest = false;
+    }
+
+    private async _trackAndPerformAsync(): Promise<void> {
+        if (this._hasPendingRequest) {
+            return;
+        }
+
+        this._hasPendingRequest = true;
+        try {
+            await this._performFunction();
+        } finally {
+            this._hasPendingRequest = false;
+        }
+    }
+}
diff --git a/packages/instant/src/util/heartbeater_factory.ts b/packages/instant/src/util/heartbeater_factory.ts
new file mode 100644
index 000000000..9fac9cf4c
--- /dev/null
+++ b/packages/instant/src/util/heartbeater_factory.ts
@@ -0,0 +1,17 @@
+import { asyncData } from '../redux/async_data';
+import { Store } from '../redux/store';
+
+import { updateBuyQuoteOrFlashErrorAsyncForState } from './buy_quote_fetcher';
+import { Heartbeater } from './heartbeater';
+
+export const generateAccountHeartbeater = (store: Store): Heartbeater => {
+    return new Heartbeater(async () => {
+        await asyncData.fetchAccountInfoAndDispatchToStore(store, { setLoading: false });
+    });
+};
+
+export const generateBuyQuoteHeartbeater = (store: Store): Heartbeater => {
+    return new Heartbeater(async () => {
+        await updateBuyQuoteOrFlashErrorAsyncForState(store.getState(), store.dispatch);
+    });
+};