Merge branch 'development' into feature/testnet-faucets/order-dispenser

* development: (49 commits)
  Prettier
  Updated contract generation in 0x to new abi-gen CLI
  Add PR number to changelog
  Fix lint errors
  Removed deprecated CLI options
  Add protected keyword to underscore lint rule
  Remove unused prop
  Fix prettier
  Uppercase Networks enum values
  Make default gasPrice more readable
  Fix prettier mess
  Fix linter errors
  Shrink img
  Fix all setState calls after unmounted errors. Decided to create our own flag rather then using a cancellablePromise since there was little to be gained from this alternative
  Fix bug where we were return undefined instead of the empty object
  Default the derivation path to that found in the Ledger subprovider
  Add browser data to dialog info
  Add Rinkeby support
  Pass in whether we want the personal message prefix appended and never append it for Ledger. This fixes signing when Ledger is used and the backing node is not Parity
  Wholesale replace the tokenByAddress and de-dup properly
  ...

1 files changed, 205 insertions, 156 deletions

diff --git a/packages/website/ts/blockchain.ts b/packages/website/ts/blockchain.ts
index 5530701c0..71995e2cd 100644
--- a/packages/website/ts/blockchain.ts
+++ b/packages/website/ts/blockchain.ts
@@ -37,10 +37,10 @@ import {
     EtherscanLinkSuffixes,
     ProviderType,
     Side,
+    SideToAssetToken,
     SignatureData,
     Token,
     TokenByAddress,
-    TokenStateByAddress,
 } from 'ts/types';
 import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
@@ -54,6 +54,7 @@ import FilterSubprovider = require('web3-provider-engine/subproviders/filters');
 import * as MintableArtifacts from '../contracts/Mintable.json';
 
 const BLOCK_NUMBER_BACK_TRACK = 50;
+const GWEI_IN_WEI = 1000000000;
 
 export class Blockchain {
     public networkId: number;
@@ -64,8 +65,9 @@ export class Blockchain {
     private _exchangeAddress: string;
     private _userAddress: string;
     private _cachedProvider: Web3.Provider;
+    private _cachedProviderNetworkId: number;
     private _ledgerSubprovider: LedgerWalletSubprovider;
-    private _zrxPollIntervalId: NodeJS.Timer;
+    private _defaultGasPrice: BigNumber;
     private static async _onPageLoadAsync(): Promise<void> {
         if (document.readyState === 'complete') {
             return; // Already loaded
@@ -111,7 +113,7 @@ export class Blockchain {
             // injected into their browser.
             provider = new ProviderEngine();
             provider.addProvider(new FilterSubprovider());
-            const networkId = configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_TESTNET;
+            const networkId = configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_KOVAN;
             provider.addProvider(new RedundantRPCSubprovider(configs.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkId]));
             provider.start();
         }
@@ -121,6 +123,10 @@ export class Blockchain {
     constructor(dispatcher: Dispatcher, isSalePage: boolean = false) {
         this._dispatcher = dispatcher;
         this._userAddress = '';
+        const defaultGasPrice = GWEI_IN_WEI * 30;
+        this._defaultGasPrice = new BigNumber(defaultGasPrice);
+        // tslint:disable-next-line:no-floating-promises
+        this._updateDefaultGasPriceAsync();
         // tslint:disable-next-line:no-floating-promises
         this._onPageLoadInitFireAndForgetAsync();
     }
@@ -133,14 +139,14 @@ export class Blockchain {
         } else if (this.networkId !== newNetworkId) {
             this.networkId = newNetworkId;
             this._dispatcher.encounteredBlockchainError(BlockchainErrs.NoError);
-            await this._fetchTokenInformationAsync();
+            await this.fetchTokenInformationAsync();
             await this._rehydrateStoreWithContractEvents();
         }
     }
     public async userAddressUpdatedFireAndForgetAsync(newUserAddress: string) {
         if (this._userAddress !== newUserAddress) {
             this._userAddress = newUserAddress;
-            await this._fetchTokenInformationAsync();
+            await this.fetchTokenInformationAsync();
             await this._rehydrateStoreWithContractEvents();
         }
     }
@@ -180,84 +186,96 @@ export class Blockchain {
         }
         this._ledgerSubprovider.setPathIndex(pathIndex);
     }
-    public async providerTypeUpdatedFireAndForgetAsync(providerType: ProviderType) {
+    public async updateProviderToLedgerAsync(networkId: number) {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
-        // Should actually be Web3.Provider|ProviderEngine union type but it causes issues
-        // later on in the logic.
-        let provider;
-        switch (providerType) {
-            case ProviderType.Ledger: {
-                const isU2FSupported = await utils.isU2FSupportedAsync();
-                if (!isU2FSupported) {
-                    throw new Error('Cannot update providerType to LEDGER without U2F support');
-                }
 
-                // Cache injected provider so that we can switch the user back to it easily
-                this._cachedProvider = this._web3Wrapper.getProviderObj();
-
-                this._dispatcher.updateUserAddress(''); // Clear old userAddress
-
-                provider = new ProviderEngine();
-                const ledgerWalletConfigs = {
-                    networkId: this.networkId,
-                    ledgerEthereumClientFactoryAsync: ledgerEthereumBrowserClientFactoryAsync,
-                };
-                this._ledgerSubprovider = new LedgerSubprovider(ledgerWalletConfigs);
-                provider.addProvider(this._ledgerSubprovider);
-                provider.addProvider(new FilterSubprovider());
-                const networkId = configs.IS_MAINNET_ENABLED
-                    ? constants.NETWORK_ID_MAINNET
-                    : constants.NETWORK_ID_TESTNET;
-                provider.addProvider(new RedundantRPCSubprovider(configs.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkId]));
-                provider.start();
-                this._web3Wrapper.destroy();
-                const shouldPollUserAddress = false;
-                this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
-                this._zeroEx.setProvider(provider, networkId);
-                await this._postInstantiationOrUpdatingProviderZeroExAsync();
-                break;
-            }
+        const isU2FSupported = await utils.isU2FSupportedAsync();
+        if (!isU2FSupported) {
+            throw new Error('Cannot update providerType to LEDGER without U2F support');
+        }
 
-            case ProviderType.Injected: {
-                if (_.isUndefined(this._cachedProvider)) {
-                    return; // Going from injected to injected, so we noop
-                }
-                provider = this._cachedProvider;
-                const shouldPollUserAddress = true;
-                this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
-                this._zeroEx.setProvider(provider, this.networkId);
-                await this._postInstantiationOrUpdatingProviderZeroExAsync();
-                delete this._ledgerSubprovider;
-                delete this._cachedProvider;
-                break;
-            }
+        // Cache injected provider so that we can switch the user back to it easily
+        if (_.isUndefined(this._cachedProvider)) {
+            this._cachedProvider = this._web3Wrapper.getProviderObj();
+            this._cachedProviderNetworkId = this.networkId;
+        }
 
-            default:
-                throw utils.spawnSwitchErr('providerType', providerType);
+        this._web3Wrapper.destroy();
+
+        this._userAddress = '';
+        this._dispatcher.updateUserAddress(''); // Clear old userAddress
+
+        const provider = new ProviderEngine();
+        const ledgerWalletConfigs = {
+            networkId,
+            ledgerEthereumClientFactoryAsync: ledgerEthereumBrowserClientFactoryAsync,
+        };
+        this._ledgerSubprovider = new LedgerSubprovider(ledgerWalletConfigs);
+        provider.addProvider(this._ledgerSubprovider);
+        provider.addProvider(new FilterSubprovider());
+        provider.addProvider(new RedundantRPCSubprovider(configs.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkId]));
+        provider.start();
+        this.networkId = networkId;
+        this._dispatcher.updateNetworkId(this.networkId);
+        const shouldPollUserAddress = false;
+        this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
+        this._zeroEx.setProvider(provider, this.networkId);
+        await this._postInstantiationOrUpdatingProviderZeroExAsync();
+        this._web3Wrapper.startEmittingNetworkConnectionAndUserBalanceState();
+        this._dispatcher.updateProviderType(ProviderType.Ledger);
+    }
+    public async updateProviderToInjectedAsync() {
+        utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
+
+        if (_.isUndefined(this._cachedProvider)) {
+            return; // Going from injected to injected, so we noop
         }
 
-        await this._fetchTokenInformationAsync();
+        this._web3Wrapper.destroy();
+
+        const provider = this._cachedProvider;
+        this.networkId = this._cachedProviderNetworkId;
+
+        const shouldPollUserAddress = true;
+        this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
+
+        this._userAddress = await this._web3Wrapper.getFirstAccountIfExistsAsync();
+
+        this._zeroEx.setProvider(provider, this.networkId);
+        await this._postInstantiationOrUpdatingProviderZeroExAsync();
+
+        await this.fetchTokenInformationAsync();
+        this._web3Wrapper.startEmittingNetworkConnectionAndUserBalanceState();
+        this._dispatcher.updateProviderType(ProviderType.Injected);
+        delete this._ledgerSubprovider;
+        delete this._cachedProvider;
     }
     public async setProxyAllowanceAsync(token: Token, amountInBaseUnits: BigNumber): Promise<void> {
         utils.assert(this.isValidAddress(token.address), BlockchainCallErrs.TokenAddressIsInvalid);
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
 
+        this._showFlashMessageIfLedger();
         const txHash = await this._zeroEx.token.setProxyAllowanceAsync(
             token.address,
             this._userAddress,
             amountInBaseUnits,
+            {
+                gasPrice: this._defaultGasPrice,
+            },
         );
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
-        const allowance = amountInBaseUnits;
-        this._dispatcher.replaceTokenAllowanceByAddress(token.address, allowance);
     }
     public async transferAsync(token: Token, toAddress: string, amountInBaseUnits: BigNumber): Promise<void> {
+        this._showFlashMessageIfLedger();
         const txHash = await this._zeroEx.token.transferAsync(
             token.address,
             this._userAddress,
             toAddress,
             amountInBaseUnits,
+            {
+                gasPrice: this._defaultGasPrice,
+            },
         );
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
         const etherScanLinkIfExists = utils.getEtherScanLinkIfExists(txHash, this.networkId, EtherscanLinkSuffixes.Tx);
@@ -309,11 +327,15 @@ export class Blockchain {
 
         const shouldThrowOnInsufficientBalanceOrAllowance = true;
 
+        this._showFlashMessageIfLedger();
         const txHash = await this._zeroEx.exchange.fillOrderAsync(
             signedOrder,
             fillTakerTokenAmount,
             shouldThrowOnInsufficientBalanceOrAllowance,
             this._userAddress,
+            {
+                gasPrice: this._defaultGasPrice,
+            },
         );
         const receipt = await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
         const logs: Array<LogWithDecodedArgs<ExchangeContractEventArgs>> = receipt.logs as any;
@@ -324,7 +346,10 @@ export class Blockchain {
         return filledTakerTokenAmount;
     }
     public async cancelOrderAsync(signedOrder: SignedOrder, cancelTakerTokenAmount: BigNumber): Promise<BigNumber> {
-        const txHash = await this._zeroEx.exchange.cancelOrderAsync(signedOrder, cancelTakerTokenAmount);
+        this._showFlashMessageIfLedger();
+        const txHash = await this._zeroEx.exchange.cancelOrderAsync(signedOrder, cancelTakerTokenAmount, {
+            gasPrice: this._defaultGasPrice,
+        });
         const receipt = await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
         const logs: Array<LogWithDecodedArgs<ExchangeContractEventArgs>> = receipt.logs as any;
         this._zeroEx.exchange.throwLogErrorsAsErrors(logs);
@@ -368,22 +393,25 @@ export class Blockchain {
 
         const [currBalance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddress, token.address);
 
-        this._zrxPollIntervalId = intervalUtils.setAsyncExcludingInterval(
-            async () => {
-                const [balance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddress, token.address);
-                if (!balance.eq(currBalance)) {
-                    this._dispatcher.replaceTokenBalanceByAddress(token.address, balance);
-                    intervalUtils.clearAsyncExcludingInterval(this._zrxPollIntervalId);
-                    delete this._zrxPollIntervalId;
-                }
-            },
-            5000,
-            (err: Error) => {
-                utils.consoleLog(`Polling tokenBalance failed: ${err}`);
-                intervalUtils.clearAsyncExcludingInterval(this._zrxPollIntervalId);
-                delete this._zrxPollIntervalId;
-            },
-        );
+        const newTokenBalancePromise = new Promise((resolve: (balance: BigNumber) => void, reject) => {
+            const tokenPollInterval = intervalUtils.setAsyncExcludingInterval(
+                async () => {
+                    const [balance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddress, token.address);
+                    if (!balance.eq(currBalance)) {
+                        intervalUtils.clearAsyncExcludingInterval(tokenPollInterval);
+                        resolve(balance);
+                    }
+                },
+                5000,
+                (err: Error) => {
+                    utils.consoleLog(`Polling tokenBalance failed: ${err}`);
+                    intervalUtils.clearAsyncExcludingInterval(tokenPollInterval);
+                    reject(err);
+                },
+            );
+        });
+
+        return newTokenBalancePromise;
     }
     public async signOrderHashAsync(orderHash: string): Promise<SignatureData> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
@@ -393,7 +421,21 @@ export class Blockchain {
         if (_.isUndefined(makerAddress)) {
             throw new Error('Tried to send a sign request but user has no associated addresses');
         }
-        const ecSignature = await this._zeroEx.signOrderHashAsync(orderHash, makerAddress);
+
+        this._showFlashMessageIfLedger();
+        const nodeVersion = await this._web3Wrapper.getNodeVersionAsync();
+        const isParityNode = utils.isParityNode(nodeVersion);
+        const isTestRpc = utils.isTestRpc(nodeVersion);
+        const isLedgerSigner = !_.isUndefined(this._ledgerSubprovider);
+        let shouldAddPersonalMessagePrefix = true;
+        if ((isParityNode && !isLedgerSigner) || isTestRpc || isLedgerSigner) {
+            shouldAddPersonalMessagePrefix = false;
+        }
+        const ecSignature = await this._zeroEx.signOrderHashAsync(
+            orderHash,
+            makerAddress,
+            shouldAddPersonalMessagePrefix,
+        );
         const signatureData = _.extend({}, ecSignature, {
             hash: orderHash,
         });
@@ -404,11 +446,11 @@ export class Blockchain {
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
         const mintableContract = await this._instantiateContractIfExistsAsync(MintableArtifacts, token.address);
+        this._showFlashMessageIfLedger();
         await mintableContract.mint(constants.MINT_AMOUNT, {
             from: this._userAddress,
+            gasPrice: this._defaultGasPrice,
         });
-        const balanceDelta = constants.MINT_AMOUNT;
-        this._dispatcher.updateTokenBalanceByAddress(token.address, balanceDelta);
     }
     public async getBalanceInEthAsync(owner: string): Promise<BigNumber> {
         const balance = await this._web3Wrapper.getBalanceInEthAsync(owner);
@@ -418,14 +460,20 @@ export class Blockchain {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
-        const txHash = await this._zeroEx.etherToken.depositAsync(etherTokenAddress, amount, this._userAddress);
+        this._showFlashMessageIfLedger();
+        const txHash = await this._zeroEx.etherToken.depositAsync(etherTokenAddress, amount, this._userAddress, {
+            gasPrice: this._defaultGasPrice,
+        });
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
     }
     public async convertWrappedEthTokensToEthAsync(etherTokenAddress: string, amount: BigNumber): Promise<void> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
-        const txHash = await this._zeroEx.etherToken.withdrawAsync(etherTokenAddress, amount, this._userAddress);
+        this._showFlashMessageIfLedger();
+        const txHash = await this._zeroEx.etherToken.withdrawAsync(etherTokenAddress, amount, this._userAddress, {
+            gasPrice: this._defaultGasPrice,
+        });
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
     }
     public async doesContractExistAtAddressAsync(address: string) {
@@ -451,22 +499,6 @@ export class Blockchain {
         }
         return [balance, allowance];
     }
-    public async updateTokenBalancesAndAllowancesAsync(tokens: Token[]) {
-        const tokenStateByAddress: TokenStateByAddress = {};
-        for (const token of tokens) {
-            let balance = new BigNumber(0);
-            let allowance = new BigNumber(0);
-            if (this._doesUserAddressExist()) {
-                [balance, allowance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddress, token.address);
-            }
-            const tokenState = {
-                balance,
-                allowance,
-            };
-            tokenStateByAddress[token.address] = tokenState;
-        }
-        this._dispatcher.updateTokenStateByAddress(tokenStateByAddress);
-    }
     public async getUserAccountsAsync() {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
         const userAccountsIfExists = await this._zeroEx.getAvailableAddressesAsync();
@@ -479,10 +511,59 @@ export class Blockchain {
         this._web3Wrapper.updatePrevUserAddress(newUserAddress);
     }
     public destroy() {
-        intervalUtils.clearAsyncExcludingInterval(this._zrxPollIntervalId);
         this._web3Wrapper.destroy();
         this._stopWatchingExchangeLogFillEvents();
     }
+    public async fetchTokenInformationAsync() {
+        utils.assert(
+            !_.isUndefined(this.networkId),
+            'Cannot call fetchTokenInformationAsync if disconnected from Ethereum node',
+        );
+
+        this._dispatcher.updateBlockchainIsLoaded(false);
+
+        const tokenRegistryTokensByAddress = await this._getTokenRegistryTokensByAddressAsync();
+
+        const trackedTokensByAddress = trackedTokenStorage.getTrackedTokensByAddress(this._userAddress, this.networkId);
+        const tokenRegistryTokens = _.values(tokenRegistryTokensByAddress);
+        if (_.isEmpty(trackedTokensByAddress)) {
+            _.each(configs.DEFAULT_TRACKED_TOKEN_SYMBOLS, symbol => {
+                const token = _.find(tokenRegistryTokens, t => t.symbol === symbol);
+                token.isTracked = true;
+                trackedTokensByAddress[token.address] = token;
+            });
+            _.each(trackedTokensByAddress, (token: Token, address: string) => {
+                trackedTokenStorage.addTrackedTokenToUser(this._userAddress, this.networkId, token);
+            });
+        } else {
+            // Properly set all tokenRegistry tokens `isTracked` to true if they are in the existing trackedTokens array
+            _.each(trackedTokensByAddress, (trackedToken: Token, address: string) => {
+                if (!_.isUndefined(tokenRegistryTokensByAddress[address])) {
+                    tokenRegistryTokensByAddress[address].isTracked = true;
+                }
+            });
+        }
+        const allTokensByAddress = {
+            ...tokenRegistryTokensByAddress,
+            ...trackedTokensByAddress,
+        };
+        const allTokens = _.values(allTokensByAddress);
+        const mostPopularTradingPairTokens: Token[] = [
+            _.find(allTokens, { symbol: configs.DEFAULT_TRACKED_TOKEN_SYMBOLS[0] }),
+            _.find(allTokens, { symbol: configs.DEFAULT_TRACKED_TOKEN_SYMBOLS[1] }),
+        ];
+        const sideToAssetToken: SideToAssetToken = {
+            [Side.Deposit]: {
+                address: mostPopularTradingPairTokens[0].address,
+            },
+            [Side.Receive]: {
+                address: mostPopularTradingPairTokens[1].address,
+            },
+        };
+        this._dispatcher.batchDispatch(allTokensByAddress, this.networkId, this._userAddress, sideToAssetToken);
+
+        this._dispatcher.updateBlockchainIsLoaded(true);
+    }
     private async _showEtherScanLinkAndAwaitTransactionMinedAsync(
         txHash: string,
     ): Promise<TransactionReceiptWithDecodedLogs> {
@@ -608,7 +689,7 @@ export class Blockchain {
         }
     }
     private _stopWatchingExchangeLogFillEvents(): void {
-        this._zeroEx.exchange.unsubscribeAll();
+        this._zeroEx.exchange._unsubscribeAll();
     }
     private async _getTokenRegistryTokensByAddressAsync(): Promise<TokenByAddress> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
@@ -665,17 +746,23 @@ export class Blockchain {
         }
 
         const provider = await Blockchain._getProviderAsync(injectedWeb3, networkIdIfExists);
-        const networkId = !_.isUndefined(networkIdIfExists)
+        this.networkId = !_.isUndefined(networkIdIfExists)
             ? networkIdIfExists
-            : configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_TESTNET;
+            : configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_KOVAN;
+        this._dispatcher.updateNetworkId(this.networkId);
         const zeroExConfigs = {
-            networkId,
+            networkId: this.networkId,
         };
         this._zeroEx = new ZeroEx(provider, zeroExConfigs);
         this._updateProviderName(injectedWeb3);
         const shouldPollUserAddress = true;
-        this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, networkId, shouldPollUserAddress);
+        this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
         await this._postInstantiationOrUpdatingProviderZeroExAsync();
+        this._userAddress = await this._web3Wrapper.getFirstAccountIfExistsAsync();
+        this._dispatcher.updateUserAddress(this._userAddress);
+        await this.fetchTokenInformationAsync();
+        this._web3Wrapper.startEmittingNetworkConnectionAndUserBalanceState();
+        await this._rehydrateStoreWithContractEvents();
     }
     // This method should always be run after instantiating or updating the provider
     // of the ZeroEx instance.
@@ -690,60 +777,6 @@ export class Blockchain {
             : constants.PROVIDER_NAME_PUBLIC;
         this._dispatcher.updateInjectedProviderName(providerName);
     }
-    private async _fetchTokenInformationAsync() {
-        utils.assert(
-            !_.isUndefined(this.networkId),
-            'Cannot call fetchTokenInformationAsync if disconnected from Ethereum node',
-        );
-
-        this._dispatcher.updateBlockchainIsLoaded(false);
-        this._dispatcher.clearTokenByAddress();
-
-        const tokenRegistryTokensByAddress = await this._getTokenRegistryTokensByAddressAsync();
-
-        // HACK: We need to fetch the userAddress here because otherwise we cannot save the
-        // tracked tokens in localStorage under the users address nor fetch the token
-        // balances and allowances and we need to do this in order not to trigger the blockchain
-        // loading dialog to show up twice. First to load the contracts, and second to load the
-        // balances and allowances.
-        this._userAddress = await this._web3Wrapper.getFirstAccountIfExistsAsync();
-        if (!_.isEmpty(this._userAddress)) {
-            this._dispatcher.updateUserAddress(this._userAddress);
-        }
-
-        let trackedTokensIfExists = trackedTokenStorage.getTrackedTokensIfExists(this._userAddress, this.networkId);
-        const tokenRegistryTokens = _.values(tokenRegistryTokensByAddress);
-        if (_.isUndefined(trackedTokensIfExists)) {
-            trackedTokensIfExists = _.map(configs.DEFAULT_TRACKED_TOKEN_SYMBOLS, symbol => {
-                const token = _.find(tokenRegistryTokens, t => t.symbol === symbol);
-                token.isTracked = true;
-                return token;
-            });
-            _.each(trackedTokensIfExists, token => {
-                trackedTokenStorage.addTrackedTokenToUser(this._userAddress, this.networkId, token);
-            });
-        } else {
-            // Properly set all tokenRegistry tokens `isTracked` to true if they are in the existing trackedTokens array
-            _.each(trackedTokensIfExists, trackedToken => {
-                if (!_.isUndefined(tokenRegistryTokensByAddress[trackedToken.address])) {
-                    tokenRegistryTokensByAddress[trackedToken.address].isTracked = true;
-                }
-            });
-        }
-        const allTokens = _.uniq([...tokenRegistryTokens, ...trackedTokensIfExists]);
-        this._dispatcher.updateTokenByAddress(allTokens);
-
-        // Get balance/allowance for tracked tokens
-        await this.updateTokenBalancesAndAllowancesAsync(trackedTokensIfExists);
-
-        const mostPopularTradingPairTokens: Token[] = [
-            _.find(allTokens, { symbol: configs.DEFAULT_TRACKED_TOKEN_SYMBOLS[0] }),
-            _.find(allTokens, { symbol: configs.DEFAULT_TRACKED_TOKEN_SYMBOLS[1] }),
-        ];
-        this._dispatcher.updateChosenAssetTokenAddress(Side.Deposit, mostPopularTradingPairTokens[0].address);
-        this._dispatcher.updateChosenAssetTokenAddress(Side.Receive, mostPopularTradingPairTokens[1].address);
-        this._dispatcher.updateBlockchainIsLoaded(true);
-    }
     private async _instantiateContractIfExistsAsync(artifact: any, address?: string): Promise<ContractInstance> {
         const c = await contract(artifact);
         const providerObj = this._web3Wrapper.getProviderObj();
@@ -779,4 +812,20 @@ export class Blockchain {
             }
         }
     }
+    private _showFlashMessageIfLedger() {
+        if (!_.isUndefined(this._ledgerSubprovider)) {
+            this._dispatcher.showFlashMessage('Confirm the transaction on your Ledger Nano S');
+        }
+    }
+    private async _updateDefaultGasPriceAsync() {
+        const endpoint = `${configs.BACKEND_BASE_URL}/eth_gas_station`;
+        const response = await fetch(endpoint);
+        if (response.status !== 200) {
+            return; // noop and we keep hard-coded default
+        }
+        const gasInfo = await response.json();
+        const gasPriceInGwei = new BigNumber(gasInfo.average / 10);
+        const gasPriceInWei = gasPriceInGwei.mul(1000000000);
+        this._defaultGasPrice = gasPriceInWei;
+    }
 } // tslint:disable:max-file-line-count