From dfbf10c94bfbbdbca353531c5cae6707e05981f0 Mon Sep 17 00:00:00 2001
From: Brandon Millman <brandon.millman@gmail.com>
Date: Tue, 6 Nov 2018 20:25:30 -0800
Subject: feat(instant): fallback to an empty wallet provider when none is
 injected

---
 packages/instant/src/components/buy_button.tsx     |   8 +-
 .../src/components/buy_order_state_buttons.tsx     |   2 +-
 .../src/components/zero_ex_instant_provider.tsx    |  86 +++---
 packages/instant/src/constants.ts                  |   8 +
 .../selected_asset_buy_order_state_buttons.ts      |  46 ++--
 .../selected_erc20_asset_amount_input.ts           |   9 +-
 packages/instant/src/redux/async_data.ts           |  23 +-
 packages/instant/src/redux/reducer.ts              | 291 +++++++++++----------
 packages/instant/src/redux/store.ts                |   7 +-
 packages/instant/src/types.ts                      |  26 +-
 packages/instant/src/util/asset_buyer_factory.ts   |  17 ++
 packages/instant/src/util/injected_provider.ts     |  16 --
 packages/instant/src/util/provider_factory.ts      |  34 +++
 13 files changed, 330 insertions(+), 243 deletions(-)
 create mode 100644 packages/instant/src/util/asset_buyer_factory.ts
 delete mode 100644 packages/instant/src/util/injected_provider.ts
 create mode 100644 packages/instant/src/util/provider_factory.ts

(limited to 'packages/instant/src')

diff --git a/packages/instant/src/components/buy_button.tsx b/packages/instant/src/components/buy_button.tsx
index e6d50de96..515cd18e9 100644
--- a/packages/instant/src/components/buy_button.tsx
+++ b/packages/instant/src/components/buy_button.tsx
@@ -17,7 +17,7 @@ import { Text } from './ui/text';
 
 export interface BuyButtonProps {
     buyQuote?: BuyQuote;
-    assetBuyer?: AssetBuyer;
+    assetBuyer: AssetBuyer;
     affiliateInfo?: AffiliateInfo;
     onValidationPending: (buyQuote: BuyQuote) => void;
     onValidationFail: (buyQuote: BuyQuote, errorMessage: AssetBuyerError | ZeroExInstantError) => void;
@@ -34,7 +34,7 @@ export class BuyButton extends React.Component<BuyButtonProps> {
         onBuyFailure: util.boundNoop,
     };
     public render(): React.ReactNode {
-        const shouldDisableButton = _.isUndefined(this.props.buyQuote) || _.isUndefined(this.props.assetBuyer);
+        const shouldDisableButton = _.isUndefined(this.props.buyQuote);
         return (
             <Button width="100%" onClick={this._handleClick} isDisabled={shouldDisableButton}>
                 <Text fontColor={ColorOption.white} fontWeight={600} fontSize="20px">
@@ -46,11 +46,13 @@ export class BuyButton extends React.Component<BuyButtonProps> {
     private readonly _handleClick = async () => {
         // The button is disabled when there is no buy quote anyway.
         const { buyQuote, assetBuyer, affiliateInfo } = this.props;
-        if (_.isUndefined(buyQuote) || _.isUndefined(assetBuyer)) {
+        if (_.isUndefined(buyQuote)) {
             return;
         }
 
         this.props.onValidationPending(buyQuote);
+
+        // TODO(bmillman): move address and balance fetching to the async state
         const web3Wrapper = new Web3Wrapper(assetBuyer.provider);
         const takerAddress = await getBestAddress(web3Wrapper);
 
diff --git a/packages/instant/src/components/buy_order_state_buttons.tsx b/packages/instant/src/components/buy_order_state_buttons.tsx
index 2759ba341..3d0ede7b1 100644
--- a/packages/instant/src/components/buy_order_state_buttons.tsx
+++ b/packages/instant/src/components/buy_order_state_buttons.tsx
@@ -15,7 +15,7 @@ import { Text } from './ui/text';
 export interface BuyOrderStateButtonProps {
     buyQuote?: BuyQuote;
     buyOrderProcessingState: OrderProcessState;
-    assetBuyer?: AssetBuyer;
+    assetBuyer: AssetBuyer;
     affiliateInfo?: AffiliateInfo;
     onViewTransaction: () => void;
     onValidationPending: (buyQuote: BuyQuote) => void;
diff --git a/packages/instant/src/components/zero_ex_instant_provider.tsx b/packages/instant/src/components/zero_ex_instant_provider.tsx
index 0b9408329..ed0fabdf3 100644
--- a/packages/instant/src/components/zero_ex_instant_provider.tsx
+++ b/packages/instant/src/components/zero_ex_instant_provider.tsx
@@ -1,23 +1,22 @@
-import { AssetBuyer } from '@0x/asset-buyer';
-import { ObjectMap, SignedOrder } from '@0x/types';
+import { ObjectMap } from '@0x/types';
 import { BigNumber } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
 import { Provider } from 'ethereum-types';
 import * as _ from 'lodash';
 import * as React from 'react';
 import { Provider as ReduxProvider } from 'react-redux';
-import { oc } from 'ts-optchain';
 
 import { SelectedAssetThemeProvider } from '../containers/selected_asset_theme_provider';
 import { asyncData } from '../redux/async_data';
-import { INITIAL_STATE, State } from '../redux/reducer';
+import { DEFAULT_STATE, DefaultState, State } from '../redux/reducer';
 import { store, Store } from '../redux/store';
 import { fonts } from '../style/fonts';
-import { AffiliateInfo, AssetMetaData, Network } from '../types';
+import { AffiliateInfo, AssetMetaData, Network, OrderSource, ProviderState, ProviderType } from '../types';
 import { assetUtils } from '../util/asset';
+import { assetBuyerFactory } from '../util/asset_buyer_factory';
 import { errorFlasher } from '../util/error_flasher';
 import { gasPriceEstimator } from '../util/gas_price_estimator';
-import { getInjectedProvider } from '../util/injected_provider';
+import { providerFactory } from '../util/provider_factory';
 
 fonts.include();
 
@@ -25,7 +24,7 @@ export type ZeroExInstantProviderProps = ZeroExInstantProviderRequiredProps &
     Partial<ZeroExInstantProviderOptionalProps>;
 
 export interface ZeroExInstantProviderRequiredProps {
-    orderSource: string | SignedOrder[];
+    orderSource: OrderSource;
 }
 
 export interface ZeroExInstantProviderOptionalProps {
@@ -41,30 +40,43 @@ export interface ZeroExInstantProviderOptionalProps {
 export class ZeroExInstantProvider extends React.Component<ZeroExInstantProviderProps> {
     private readonly _store: Store;
     // TODO(fragosti): Write tests for this beast once we inject a provider.
-    private static _mergeInitialStateWithProps(props: ZeroExInstantProviderProps, state: State = INITIAL_STATE): State {
-        const networkId = props.networkId || state.network;
-        // TODO: Proper wallet connect flow
-        const provider = props.provider || getInjectedProvider();
-        const assetBuyerOptions = {
-            networkId,
-        };
-        let assetBuyer;
-        if (_.isString(props.orderSource)) {
-            assetBuyer = AssetBuyer.getAssetBuyerForStandardRelayerAPIUrl(
-                provider,
-                props.orderSource,
-                assetBuyerOptions,
-            );
+    private static _mergeDefaultStateWithProps(
+        props: ZeroExInstantProviderProps,
+        defaultState: DefaultState = DEFAULT_STATE,
+    ): State {
+        // use the networkId passed in with the props, otherwise default to that of the default state (1, mainnet)
+        const networkId = props.networkId || defaultState.network;
+        // construct the ProviderState
+        let provider: Provider;
+        let providerType: ProviderType;
+        if (!_.isUndefined(props.provider)) {
+            provider = props.provider;
+            providerType = ProviderType.Props;
         } else {
-            assetBuyer = AssetBuyer.getAssetBuyerForProvidedOrders(provider, props.orderSource, assetBuyerOptions);
+            const injectedProviderIfExists = providerFactory.getInjectedProviderIfExists();
+            if (!_.isUndefined(injectedProviderIfExists)) {
+                provider = injectedProviderIfExists;
+                providerType = ProviderType.Injected;
+            } else {
+                provider = providerFactory.getFallbackNoSigningProvider(networkId);
+                providerType = ProviderType.FallbackEmptyWallet;
+            }
         }
+        const providerState: ProviderState = {
+            provider,
+            type: providerType,
+            web3Wrapper: new Web3Wrapper(provider),
+            assetBuyer: assetBuyerFactory.getAssetBuyer(provider, props.orderSource, networkId),
+        };
+        // merge the additional additionalAssetMetaDataMap with our default map
         const completeAssetMetaDataMap = {
             ...props.additionalAssetMetaDataMap,
-            ...state.assetMetaDataMap,
+            ...defaultState.assetMetaDataMap,
         };
+        // construct the final state
         const storeStateFromProps: State = {
-            ...state,
-            assetBuyer,
+            ...defaultState,
+            providerState,
             network: networkId,
             selectedAsset: _.isUndefined(props.defaultSelectedAssetData)
                 ? undefined
@@ -74,7 +86,7 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
                       networkId,
                   ),
             selectedAssetAmount: _.isUndefined(props.defaultAssetBuyAmount)
-                ? state.selectedAssetAmount
+                ? undefined
                 : new BigNumber(props.defaultAssetBuyAmount),
             availableAssets: _.isUndefined(props.availableAssetDatas)
                 ? undefined
@@ -86,10 +98,9 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
     }
     constructor(props: ZeroExInstantProviderProps) {
         super(props);
-        const initialAppState = ZeroExInstantProvider._mergeInitialStateWithProps(this.props, INITIAL_STATE);
+        const initialAppState = ZeroExInstantProvider._mergeDefaultStateWithProps(this.props);
         this._store = store.create(initialAppState);
     }
-
     public componentDidMount(): void {
         const state = this._store.getState();
         // tslint:disable-next-line:no-floating-promises
@@ -108,7 +119,6 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
         // tslint:disable-next-line:no-floating-promises
         this._flashErrorIfWrongNetwork();
     }
-
     public render(): React.ReactNode {
         return (
             <ReduxProvider store={this._store}>
@@ -116,19 +126,15 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
             </ReduxProvider>
         );
     }
-
     private readonly _flashErrorIfWrongNetwork = async (): Promise<void> => {
         const msToShowError = 30000; // 30 seconds
-        const network = this._store.getState().network;
-        const assetBuyerIfExists = this._store.getState().assetBuyer;
-        const providerIfExists = oc(assetBuyerIfExists).provider();
-        if (!_.isUndefined(providerIfExists)) {
-            const web3Wrapper = new Web3Wrapper(providerIfExists);
-            const networkOfProvider = await web3Wrapper.getNetworkIdAsync();
-            if (network !== networkOfProvider) {
-                const errorMessage = `Wrong network detected. Try switching to ${Network[network]}.`;
-                errorFlasher.flashNewErrorMessage(this._store.dispatch, errorMessage, msToShowError);
-            }
+        const state = this._store.getState();
+        const network = state.network;
+        const web3Wrapper = state.providerState.web3Wrapper;
+        const networkOfProvider = await web3Wrapper.getNetworkIdAsync();
+        if (network !== networkOfProvider) {
+            const errorMessage = `Wrong network detected. Try switching to ${Network[network]}.`;
+            errorFlasher.flashNewErrorMessage(this._store.dispatch, errorMessage, msToShowError);
         }
     };
 }
diff --git a/packages/instant/src/constants.ts b/packages/instant/src/constants.ts
index 15105b65c..00521b56e 100644
--- a/packages/instant/src/constants.ts
+++ b/packages/instant/src/constants.ts
@@ -1,4 +1,7 @@
 import { BigNumber } from '@0x/utils';
+
+import { Network } from './types';
+
 export const BIG_NUMBER_ZERO = new BigNumber(0);
 export const ETH_DECIMALS = 18;
 export const DEFAULT_ZERO_EX_CONTAINER_SELECTOR = '#zeroExInstantContainer';
@@ -13,3 +16,8 @@ export const ETH_GAS_STATION_API_BASE_URL = 'https://ethgasstation.info';
 export const COINBASE_API_BASE_URL = 'https://api.coinbase.com/v2';
 export const PROGRESS_STALL_AT_WIDTH = '95%';
 export const PROGRESS_FINISH_ANIMATION_TIME_MS = 200;
+export const ETHEREUM_NODE_URL_BY_NETWORK = {
+    [Network.Mainnet]: 'https://mainnet.infura.io/',
+    [Network.Kovan]: 'https://kovan.infura.io/',
+};
+export const BLOCK_POLLING_INTERVAL_MS = 10000; // 10s
diff --git a/packages/instant/src/containers/selected_asset_buy_order_state_buttons.ts b/packages/instant/src/containers/selected_asset_buy_order_state_buttons.ts
index 1f9bb2cc2..c3a5e88b9 100644
--- a/packages/instant/src/containers/selected_asset_buy_order_state_buttons.ts
+++ b/packages/instant/src/containers/selected_asset_buy_order_state_buttons.ts
@@ -14,7 +14,7 @@ import { etherscanUtil } from '../util/etherscan';
 interface ConnectedState {
     buyQuote?: BuyQuote;
     buyOrderProcessingState: OrderProcessState;
-    assetBuyer?: AssetBuyer;
+    assetBuyer: AssetBuyer;
     affiliateInfo?: AffiliateInfo;
     onViewTransaction: () => void;
 }
@@ -29,29 +29,31 @@ interface ConnectedDispatch {
     onValidationFail: (buyQuote: BuyQuote, errorMessage: AssetBuyerError | ZeroExInstantError) => void;
 }
 export interface SelectedAssetBuyOrderStateButtons {}
-const mapStateToProps = (state: State, _ownProps: SelectedAssetBuyOrderStateButtons): ConnectedState => ({
-    buyOrderProcessingState: state.buyOrderState.processState,
-    assetBuyer: state.assetBuyer,
-    buyQuote: state.latestBuyQuote,
-    affiliateInfo: state.affiliateInfo,
-    onViewTransaction: () => {
-        if (
-            state.assetBuyer &&
-            (state.buyOrderState.processState === OrderProcessState.Processing ||
+const mapStateToProps = (state: State, _ownProps: SelectedAssetBuyOrderStateButtons): ConnectedState => {
+    const assetBuyer = state.providerState.assetBuyer;
+    return {
+        buyOrderProcessingState: state.buyOrderState.processState,
+        assetBuyer,
+        buyQuote: state.latestBuyQuote,
+        affiliateInfo: state.affiliateInfo,
+        onViewTransaction: () => {
+            if (
+                state.buyOrderState.processState === OrderProcessState.Processing ||
                 state.buyOrderState.processState === OrderProcessState.Success ||
-                state.buyOrderState.processState === OrderProcessState.Failure)
-        ) {
-            const etherscanUrl = etherscanUtil.getEtherScanTxnAddressIfExists(
-                state.buyOrderState.txHash,
-                state.assetBuyer.networkId,
-            );
-            if (etherscanUrl) {
-                window.open(etherscanUrl, '_blank');
-                return;
+                state.buyOrderState.processState === OrderProcessState.Failure
+            ) {
+                const etherscanUrl = etherscanUtil.getEtherScanTxnAddressIfExists(
+                    state.buyOrderState.txHash,
+                    assetBuyer.networkId,
+                );
+                if (etherscanUrl) {
+                    window.open(etherscanUrl, '_blank');
+                    return;
+                }
             }
-        }
-    },
-});
+        },
+    };
+};
 
 const mapDispatchToProps = (
     dispatch: Dispatch<Action>,
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 58257cd27..784eb4bd0 100644
--- a/packages/instant/src/containers/selected_erc20_asset_amount_input.ts
+++ b/packages/instant/src/containers/selected_erc20_asset_amount_input.ts
@@ -23,7 +23,7 @@ export interface SelectedERC20AssetAmountInputProps {
 }
 
 interface ConnectedState {
-    assetBuyer?: AssetBuyer;
+    assetBuyer: AssetBuyer;
     value?: BigNumber;
     asset?: ERC20Asset;
     isDisabled: boolean;
@@ -33,7 +33,7 @@ interface ConnectedState {
 
 interface ConnectedDispatch {
     updateBuyQuote: (
-        assetBuyer?: AssetBuyer,
+        assetBuyer: AssetBuyer,
         value?: BigNumber,
         asset?: ERC20Asset,
         affiliateInfo?: AffiliateInfo,
@@ -59,8 +59,9 @@ const mapStateToProps = (state: State, _ownProps: SelectedERC20AssetAmountInputP
             ? (state.selectedAsset as ERC20Asset)
             : undefined;
     const numberOfAssetsAvailable = _.isUndefined(state.availableAssets) ? undefined : state.availableAssets.length;
+    const assetBuyer = state.providerState.assetBuyer;
     return {
-        assetBuyer: state.assetBuyer,
+        assetBuyer,
         value: state.selectedAssetAmount,
         asset: selectedAsset,
         isDisabled,
@@ -128,7 +129,7 @@ const mapDispatchToProps = (
         // reset our buy state
         dispatch(actions.setBuyOrderStateNone());
 
-        if (!_.isUndefined(value) && value.greaterThan(0) && !_.isUndefined(asset) && !_.isUndefined(assetBuyer)) {
+        if (!_.isUndefined(value) && value.greaterThan(0) && !_.isUndefined(asset)) {
             // even if it's debounced, give them the illusion it's loading
             dispatch(actions.setQuoteRequestStatePending());
             // tslint:disable-next-line:no-floating-promises
diff --git a/packages/instant/src/redux/async_data.ts b/packages/instant/src/redux/async_data.ts
index 0e05c13da..c3d190af2 100644
--- a/packages/instant/src/redux/async_data.ts
+++ b/packages/instant/src/redux/async_data.ts
@@ -20,18 +20,17 @@ export const asyncData = {
         }
     },
     fetchAvailableAssetDatasAndDispatchToStore: async (store: Store) => {
-        const { assetBuyer, assetMetaDataMap, network } = store.getState();
-        if (!_.isUndefined(assetBuyer)) {
-            try {
-                const assetDatas = await assetBuyer.getAvailableAssetDatasAsync();
-                const assets = assetUtils.createAssetsFromAssetDatas(assetDatas, assetMetaDataMap, network);
-                store.dispatch(actions.setAvailableAssets(assets));
-            } catch (e) {
-                const errorMessage = 'Could not find any assets';
-                errorFlasher.flashNewErrorMessage(store.dispatch, errorMessage);
-                // On error, just specify that none are available
-                store.dispatch(actions.setAvailableAssets([]));
-            }
+        const { providerState, assetMetaDataMap, network } = store.getState();
+        const assetBuyer = providerState.assetBuyer;
+        try {
+            const assetDatas = await assetBuyer.getAvailableAssetDatasAsync();
+            const assets = assetUtils.createAssetsFromAssetDatas(assetDatas, assetMetaDataMap, network);
+            store.dispatch(actions.setAvailableAssets(assets));
+        } catch (e) {
+            const errorMessage = 'Could not find any assets';
+            errorFlasher.flashNewErrorMessage(store.dispatch, errorMessage);
+            // On error, just specify that none are available
+            store.dispatch(actions.setAvailableAssets([]));
         }
     },
 };
diff --git a/packages/instant/src/redux/reducer.ts b/packages/instant/src/redux/reducer.ts
index 1e4d7549e..4a939839a 100644
--- a/packages/instant/src/redux/reducer.ts
+++ b/packages/instant/src/redux/reducer.ts
@@ -1,4 +1,4 @@
-import { AssetBuyer, BuyQuote } from '@0x/asset-buyer';
+import { BuyQuote } from '@0x/asset-buyer';
 import { AssetProxyId, ObjectMap } from '@0x/types';
 import { BigNumber } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
@@ -14,172 +14,181 @@ import {
     Network,
     OrderProcessState,
     OrderState,
+    ProviderState,
 } from '../types';
 
 import { Action, ActionTypes } from './actions';
 
-export interface State {
+// State that is required and we have defaults for, before props are passed in
+export interface DefaultState {
     network: Network;
-    assetBuyer?: AssetBuyer;
     assetMetaDataMap: ObjectMap<AssetMetaData>;
-    selectedAsset?: Asset;
-    availableAssets?: Asset[];
-    selectedAssetAmount?: BigNumber;
     buyOrderState: OrderState;
-    ethUsdPrice?: BigNumber;
-    latestBuyQuote?: BuyQuote;
-    quoteRequestState: AsyncProcessState;
-    latestErrorMessage?: string;
     latestErrorDisplayStatus: DisplayStatus;
-    affiliateInfo?: AffiliateInfo;
+    quoteRequestState: AsyncProcessState;
+}
+
+// State that is required but needs to be derived from the props
+interface PropsDerivedState {
+    providerState: ProviderState;
 }
 
-export const INITIAL_STATE: State = {
+// State that is optional
+interface OptionalState {
+    selectedAsset: Asset;
+    availableAssets: Asset[];
+    selectedAssetAmount: BigNumber;
+    ethUsdPrice: BigNumber;
+    latestBuyQuote: BuyQuote;
+    latestErrorMessage: string;
+    affiliateInfo: AffiliateInfo;
+}
+
+export type State = DefaultState & PropsDerivedState & Partial<OptionalState>;
+
+export const DEFAULT_STATE: DefaultState = {
     network: Network.Mainnet,
-    selectedAssetAmount: undefined,
-    availableAssets: undefined,
     assetMetaDataMap,
     buyOrderState: { processState: OrderProcessState.None },
-    ethUsdPrice: undefined,
-    latestBuyQuote: undefined,
-    latestErrorMessage: undefined,
     latestErrorDisplayStatus: DisplayStatus.Hidden,
     quoteRequestState: AsyncProcessState.None,
-    affiliateInfo: undefined,
 };
 
-export const reducer = (state: State = INITIAL_STATE, action: Action): State => {
-    switch (action.type) {
-        case ActionTypes.UPDATE_ETH_USD_PRICE:
-            return {
-                ...state,
-                ethUsdPrice: action.data,
-            };
-        case ActionTypes.UPDATE_SELECTED_ASSET_AMOUNT:
-            return {
-                ...state,
-                selectedAssetAmount: action.data,
-            };
-        case ActionTypes.UPDATE_LATEST_BUY_QUOTE:
-            const newBuyQuoteIfExists = action.data;
-            const shouldUpdate =
-                _.isUndefined(newBuyQuoteIfExists) || doesBuyQuoteMatchState(newBuyQuoteIfExists, state);
-            if (shouldUpdate) {
+export const createReducer = (initialState: State) => {
+    const reducer = (state: State = initialState, action: Action): State => {
+        switch (action.type) {
+            case ActionTypes.UPDATE_ETH_USD_PRICE:
                 return {
                     ...state,
-                    latestBuyQuote: newBuyQuoteIfExists,
-                    quoteRequestState: AsyncProcessState.Success,
+                    ethUsdPrice: action.data,
                 };
-            } else {
-                return state;
-            }
-
-        case ActionTypes.SET_QUOTE_REQUEST_STATE_PENDING:
-            return {
-                ...state,
-                latestBuyQuote: undefined,
-                quoteRequestState: AsyncProcessState.Pending,
-            };
-        case ActionTypes.SET_QUOTE_REQUEST_STATE_FAILURE:
-            return {
-                ...state,
-                latestBuyQuote: undefined,
-                quoteRequestState: AsyncProcessState.Failure,
-            };
-        case ActionTypes.SET_BUY_ORDER_STATE_NONE:
-            return {
-                ...state,
-                buyOrderState: { processState: OrderProcessState.None },
-            };
-        case ActionTypes.SET_BUY_ORDER_STATE_VALIDATING:
-            return {
-                ...state,
-                buyOrderState: { processState: OrderProcessState.Validating },
-            };
-        case ActionTypes.SET_BUY_ORDER_STATE_PROCESSING:
-            const processingData = action.data;
-            const { startTimeUnix, expectedEndTimeUnix } = processingData;
-            return {
-                ...state,
-                buyOrderState: {
-                    processState: OrderProcessState.Processing,
-                    txHash: processingData.txHash,
-                    progress: {
-                        startTimeUnix,
-                        expectedEndTimeUnix,
-                    },
-                },
-            };
-        case ActionTypes.SET_BUY_ORDER_STATE_FAILURE:
-            const failureTxHash = action.data;
-            if ('txHash' in state.buyOrderState) {
-                if (state.buyOrderState.txHash === failureTxHash) {
-                    const { txHash, progress } = state.buyOrderState;
+            case ActionTypes.UPDATE_SELECTED_ASSET_AMOUNT:
+                return {
+                    ...state,
+                    selectedAssetAmount: action.data,
+                };
+            case ActionTypes.UPDATE_LATEST_BUY_QUOTE:
+                const newBuyQuoteIfExists = action.data;
+                const shouldUpdate =
+                    _.isUndefined(newBuyQuoteIfExists) || doesBuyQuoteMatchState(newBuyQuoteIfExists, state);
+                if (shouldUpdate) {
                     return {
                         ...state,
-                        buyOrderState: {
-                            processState: OrderProcessState.Failure,
-                            txHash,
-                            progress,
-                        },
+                        latestBuyQuote: newBuyQuoteIfExists,
+                        quoteRequestState: AsyncProcessState.Success,
                     };
+                } else {
+                    return state;
                 }
-            }
-            return state;
-        case ActionTypes.SET_BUY_ORDER_STATE_SUCCESS:
-            const successTxHash = action.data;
-            if ('txHash' in state.buyOrderState) {
-                if (state.buyOrderState.txHash === successTxHash) {
-                    const { txHash, progress } = state.buyOrderState;
-                    return {
-                        ...state,
-                        buyOrderState: {
-                            processState: OrderProcessState.Success,
-                            txHash,
-                            progress,
+
+            case ActionTypes.SET_QUOTE_REQUEST_STATE_PENDING:
+                return {
+                    ...state,
+                    latestBuyQuote: undefined,
+                    quoteRequestState: AsyncProcessState.Pending,
+                };
+            case ActionTypes.SET_QUOTE_REQUEST_STATE_FAILURE:
+                return {
+                    ...state,
+                    latestBuyQuote: undefined,
+                    quoteRequestState: AsyncProcessState.Failure,
+                };
+            case ActionTypes.SET_BUY_ORDER_STATE_NONE:
+                return {
+                    ...state,
+                    buyOrderState: { processState: OrderProcessState.None },
+                };
+            case ActionTypes.SET_BUY_ORDER_STATE_VALIDATING:
+                return {
+                    ...state,
+                    buyOrderState: { processState: OrderProcessState.Validating },
+                };
+            case ActionTypes.SET_BUY_ORDER_STATE_PROCESSING:
+                const processingData = action.data;
+                const { startTimeUnix, expectedEndTimeUnix } = processingData;
+                return {
+                    ...state,
+                    buyOrderState: {
+                        processState: OrderProcessState.Processing,
+                        txHash: processingData.txHash,
+                        progress: {
+                            startTimeUnix,
+                            expectedEndTimeUnix,
                         },
-                    };
+                    },
+                };
+            case ActionTypes.SET_BUY_ORDER_STATE_FAILURE:
+                const failureTxHash = action.data;
+                if ('txHash' in state.buyOrderState) {
+                    if (state.buyOrderState.txHash === failureTxHash) {
+                        const { txHash, progress } = state.buyOrderState;
+                        return {
+                            ...state,
+                            buyOrderState: {
+                                processState: OrderProcessState.Failure,
+                                txHash,
+                                progress,
+                            },
+                        };
+                    }
                 }
-            }
-            return state;
-        case ActionTypes.SET_ERROR_MESSAGE:
-            return {
-                ...state,
-                latestErrorMessage: action.data,
-                latestErrorDisplayStatus: DisplayStatus.Present,
-            };
-        case ActionTypes.HIDE_ERROR:
-            return {
-                ...state,
-                latestErrorDisplayStatus: DisplayStatus.Hidden,
-            };
-        case ActionTypes.CLEAR_ERROR:
-            return {
-                ...state,
-                latestErrorMessage: undefined,
-                latestErrorDisplayStatus: DisplayStatus.Hidden,
-            };
-        case ActionTypes.UPDATE_SELECTED_ASSET:
-            return {
-                ...state,
-                selectedAsset: action.data,
-            };
-        case ActionTypes.RESET_AMOUNT:
-            return {
-                ...state,
-                latestBuyQuote: undefined,
-                quoteRequestState: AsyncProcessState.None,
-                buyOrderState: { processState: OrderProcessState.None },
-                selectedAssetAmount: undefined,
-            };
-        case ActionTypes.SET_AVAILABLE_ASSETS:
-            return {
-                ...state,
-                availableAssets: action.data,
-            };
-        default:
-            return state;
-    }
+                return state;
+            case ActionTypes.SET_BUY_ORDER_STATE_SUCCESS:
+                const successTxHash = action.data;
+                if ('txHash' in state.buyOrderState) {
+                    if (state.buyOrderState.txHash === successTxHash) {
+                        const { txHash, progress } = state.buyOrderState;
+                        return {
+                            ...state,
+                            buyOrderState: {
+                                processState: OrderProcessState.Success,
+                                txHash,
+                                progress,
+                            },
+                        };
+                    }
+                }
+                return state;
+            case ActionTypes.SET_ERROR_MESSAGE:
+                return {
+                    ...state,
+                    latestErrorMessage: action.data,
+                    latestErrorDisplayStatus: DisplayStatus.Present,
+                };
+            case ActionTypes.HIDE_ERROR:
+                return {
+                    ...state,
+                    latestErrorDisplayStatus: DisplayStatus.Hidden,
+                };
+            case ActionTypes.CLEAR_ERROR:
+                return {
+                    ...state,
+                    latestErrorMessage: undefined,
+                    latestErrorDisplayStatus: DisplayStatus.Hidden,
+                };
+            case ActionTypes.UPDATE_SELECTED_ASSET:
+                return {
+                    ...state,
+                    selectedAsset: action.data,
+                };
+            case ActionTypes.RESET_AMOUNT:
+                return {
+                    ...state,
+                    latestBuyQuote: undefined,
+                    quoteRequestState: AsyncProcessState.None,
+                    buyOrderState: { processState: OrderProcessState.None },
+                    selectedAssetAmount: undefined,
+                };
+            case ActionTypes.SET_AVAILABLE_ASSETS:
+                return {
+                    ...state,
+                    availableAssets: action.data,
+                };
+            default:
+                return state;
+        }
+    };
+    return reducer;
 };
 
 const doesBuyQuoteMatchState = (buyQuote: BuyQuote, state: State): boolean => {
diff --git a/packages/instant/src/redux/store.ts b/packages/instant/src/redux/store.ts
index 01deb8690..20710765d 100644
--- a/packages/instant/src/redux/store.ts
+++ b/packages/instant/src/redux/store.ts
@@ -2,12 +2,13 @@ import * as _ from 'lodash';
 import { createStore, Store as ReduxStore } from 'redux';
 import { devToolsEnhancer } from 'redux-devtools-extension/developmentOnly';
 
-import { reducer, State } from './reducer';
+import { createReducer, State } from './reducer';
 
 export type Store = ReduxStore<State>;
 
 export const store = {
-    create: (state: State): Store => {
-        return createStore(reducer, state, devToolsEnhancer({}));
+    create: (initialState: State): Store => {
+        const reducer = createReducer(initialState);
+        return createStore(reducer, initialState, devToolsEnhancer({}));
     },
 };
diff --git a/packages/instant/src/types.ts b/packages/instant/src/types.ts
index 04469f8b9..0ab227310 100644
--- a/packages/instant/src/types.ts
+++ b/packages/instant/src/types.ts
@@ -1,4 +1,7 @@
-import { AssetProxyId, ObjectMap } from '@0x/types';
+import { AssetBuyer } from '@0x/asset-buyer';
+import { AssetProxyId, ObjectMap, SignedOrder } from '@0x/types';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import { Provider } from 'ethereum-types';
 
 // Reusable
 export type Maybe<T> = T | undefined;
@@ -89,3 +92,24 @@ export interface AffiliateInfo {
     feeRecipient: string;
     feePercentage: number;
 }
+
+/**
+ * Our provider may be of 3 different types:
+ * Props: the provider was passed in a prop to the component
+ * Injected: the provider was injected into `window`
+ * FallbackEmptyWallet: the provider has no wallet but responds to data requests using infura
+ */
+export enum ProviderType {
+    Props = 'PROPS',
+    Injected = 'INJECTED',
+    FallbackEmptyWallet = 'FALLBACK_EMPTY_WALLET',
+}
+
+export interface ProviderState {
+    type: ProviderType;
+    provider: Provider;
+    assetBuyer: AssetBuyer;
+    web3Wrapper: Web3Wrapper;
+}
+
+export type OrderSource = string | SignedOrder[];
diff --git a/packages/instant/src/util/asset_buyer_factory.ts b/packages/instant/src/util/asset_buyer_factory.ts
new file mode 100644
index 000000000..5ba46223c
--- /dev/null
+++ b/packages/instant/src/util/asset_buyer_factory.ts
@@ -0,0 +1,17 @@
+import { AssetBuyer, AssetBuyerOpts } from '@0x/asset-buyer';
+import { Provider } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { Network, OrderSource } from '../types';
+
+export const assetBuyerFactory = {
+    getAssetBuyer: (provider: Provider, orderSource: OrderSource, network: Network): AssetBuyer => {
+        const assetBuyerOptions: Partial<AssetBuyerOpts> = {
+            networkId: network,
+        };
+        const assetBuyer = _.isString(orderSource)
+            ? AssetBuyer.getAssetBuyerForStandardRelayerAPIUrl(provider, orderSource, assetBuyerOptions)
+            : AssetBuyer.getAssetBuyerForProvidedOrders(provider, orderSource, assetBuyerOptions);
+        return assetBuyer;
+    },
+};
diff --git a/packages/instant/src/util/injected_provider.ts b/packages/instant/src/util/injected_provider.ts
deleted file mode 100644
index 40f9e2da5..000000000
--- a/packages/instant/src/util/injected_provider.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import { Provider } from 'ethereum-types';
-import * as _ from 'lodash';
-
-export const getInjectedProvider = (): Provider => {
-    const injectedProviderIfExists = (window as any).ethereum;
-    if (!_.isUndefined(injectedProviderIfExists)) {
-        // TODO: call enable here when implementing wallet connection flow
-        return injectedProviderIfExists;
-    }
-    const injectedWeb3IfExists = (window as any).web3;
-    if (!_.isUndefined(injectedWeb3IfExists.currentProvider)) {
-        return injectedWeb3IfExists.currentProvider;
-    } else {
-        throw new Error(`No injected web3 found`);
-    }
-};
diff --git a/packages/instant/src/util/provider_factory.ts b/packages/instant/src/util/provider_factory.ts
new file mode 100644
index 000000000..603f7674d
--- /dev/null
+++ b/packages/instant/src/util/provider_factory.ts
@@ -0,0 +1,34 @@
+import { EmptyWalletSubprovider, RPCSubprovider, Web3ProviderEngine } from '@0x/subproviders';
+import { Provider } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { BLOCK_POLLING_INTERVAL_MS, ETHEREUM_NODE_URL_BY_NETWORK } from '../constants';
+import { Maybe, Network } from '../types';
+
+export const providerFactory = {
+    getInjectedProviderIfExists: (): Maybe<Provider> => {
+        const injectedProviderIfExists = (window as any).ethereum;
+        if (!_.isUndefined(injectedProviderIfExists)) {
+            return injectedProviderIfExists;
+        }
+        const injectedWeb3IfExists = (window as any).web3;
+        if (!_.isUndefined(injectedWeb3IfExists) && !_.isUndefined(injectedWeb3IfExists.currentProvider)) {
+            return injectedWeb3IfExists.currentProvider;
+        }
+        return undefined;
+    },
+    getFallbackNoSigningProvider: (network: Network): Provider => {
+        const providerEngine = new Web3ProviderEngine({
+            pollingInterval: BLOCK_POLLING_INTERVAL_MS,
+        });
+        // Intercept calls to `eth_accounts` and always return empty
+        providerEngine.addProvider(new EmptyWalletSubprovider());
+        // Construct an RPC subprovider, all data based requests will be sent via the RPCSubprovider
+        // TODO(bmillman): make this more resilient to infura failures
+        const rpcUrl = ETHEREUM_NODE_URL_BY_NETWORK[network];
+        providerEngine.addProvider(new RPCSubprovider(rpcUrl));
+        // // Start the Provider Engine
+        providerEngine.start();
+        return providerEngine;
+    },
+};
-- 
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