import {
BlockParam,
DecodedLogEvent,
ExchangeContractErrs,
ExchangeContractEventArgs,
ExchangeEvents,
IndexedFilterValues,
LogCancelContractEventArgs,
LogFillContractEventArgs,
LogWithDecodedArgs,
Order,
SignedOrder,
SubscriptionOpts,
Token as ZeroExToken,
TransactionReceiptWithDecodedLogs,
ZeroEx,
ZeroExError,
} from '0x.js';
import {
InjectedWeb3Subprovider,
ledgerEthereumBrowserClientFactoryAsync,
LedgerSubprovider,
LedgerWalletSubprovider,
RedundantRPCSubprovider,
} from '@0xproject/subproviders';
import {promisify} from '@0xproject/utils';
import BigNumber from 'bignumber.js';
import compareVersions = require('compare-versions');
import ethUtil = require('ethereumjs-util');
import findVersions = require('find-versions');
import * as _ from 'lodash';
import * as React from 'react';
import contract = require('truffle-contract');
import {TokenSendCompleted} from 'ts/components/flash_messages/token_send_completed';
import {TransactionSubmitted} from 'ts/components/flash_messages/transaction_submitted';
import {trackedTokenStorage} from 'ts/local_storage/tracked_token_storage';
import {tradeHistoryStorage} from 'ts/local_storage/trade_history_storage';
import {Dispatcher} from 'ts/redux/dispatcher';
import {
BlockchainCallErrs,
BlockchainErrs,
ContractInstance,
ContractResponse,
EtherscanLinkSuffixes,
ProviderType,
Side,
SignatureData,
Token,
TokenByAddress,
TokenStateByAddress,
} from 'ts/types';
import {configs} from 'ts/utils/configs';
import {constants} from 'ts/utils/constants';
import {errorReporter} from 'ts/utils/error_reporter';
import {utils} from 'ts/utils/utils';
import {Web3Wrapper} from 'ts/web3_wrapper';
import Web3 = require('web3');
import ProviderEngine = require('web3-provider-engine');
import FilterSubprovider = require('web3-provider-engine/subproviders/filters');
import * as MintableArtifacts from '../contracts/Mintable.json';
const ALLOWANCE_TO_ZERO_GAS_AMOUNT = 45730;
const BLOCK_NUMBER_BACK_TRACK = 50;
export class Blockchain {
public networkId: number;
public nodeVersion: string;
private zeroEx: ZeroEx;
private dispatcher: Dispatcher;
private web3Wrapper?: Web3Wrapper;
private exchangeAddress: string;
private tokenTransferProxy: ContractInstance;
private tokenRegistry: ContractInstance;
private userAddress: string;
private cachedProvider: Web3.Provider;
private ledgerSubprovider: LedgerWalletSubprovider;
private zrxPollIntervalId: number;
private static async onPageLoadAsync() {
if (document.readyState === 'complete') {
return; // Already loaded
}
return new Promise((resolve, reject) => {
window.onload = resolve;
});
}
private static getNameGivenProvider(provider: Web3.Provider): string {
if (!_.isUndefined((provider as any).isMetaMask)) {
return constants.METAMASK_PROVIDER_NAME;
}
// HACK: We use the fact that Parity Signer's provider is an instance of their
// internal `Web3FrameProvider` class.
const isParitySigner = _.startsWith(provider.constructor.toString(), 'function Web3FrameProvider');
if (isParitySigner) {
return constants.PARITY_SIGNER_PROVIDER_NAME;
}
return constants.GENERIC_PROVIDER_NAME;
}
private static async getProviderAsync(injectedWeb3: Web3, networkIdIfExists: number) {
const doesInjectedWeb3Exist = !_.isUndefined(injectedWeb3);
const publicNodeUrlsIfExistsForNetworkId = constants.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkIdIfExists];
const isPublicNodeAvailableForNetworkId = !_.isUndefined(publicNodeUrlsIfExistsForNetworkId);
let provider;
if (doesInjectedWeb3Exist && isPublicNodeAvailableForNetworkId) {
// We catch all requests involving a users account and send it to the injectedWeb3
// instance. All other requests go to the public hosted node.
provider = new ProviderEngine();
provider.addProvider(new InjectedWeb3Subprovider(injectedWeb3));
provider.addProvider(new FilterSubprovider());
provider.addProvider(new RedundantRPCSubprovider(
publicNodeUrlsIfExistsForNetworkId,
));
provider.start();
} else if (doesInjectedWeb3Exist) {
// Since no public node for this network, all requests go to injectedWeb3 instance
provider = injectedWeb3.currentProvider;
} else {
// If no injectedWeb3 instance, all requests fallback to our public hosted mainnet/testnet node
// We do this so that users can still browse the 0x Portal DApp even if they do not have web3
// injected into their browser.
provider = new ProviderEngine();
provider.addProvider(new FilterSubprovider());
const networkId = configs.isMainnetEnabled ?
constants.MAINNET_NETWORK_ID :
constants.TESTNET_NETWORK_ID;
provider.addProvider(new RedundantRPCSubprovider(
constants.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkId],
));
provider.start();
}
return provider;
}
constructor(dispatcher: Dispatcher, isSalePage: boolean = false) {
this.dispatcher = dispatcher;
this.userAddress = '';
// tslint:disable-next-line:no-floating-promises
this.onPageLoadInitFireAndForgetAsync();
}
public async networkIdUpdatedFireAndForgetAsync(newNetworkId: number) {
const isConnected = !_.isUndefined(newNetworkId);
if (!isConnected) {
this.networkId = newNetworkId;
this.dispatcher.encounteredBlockchainError(BlockchainErrs.DISCONNECTED_FROM_ETHEREUM_NODE);
this.dispatcher.updateShouldBlockchainErrDialogBeOpen(true);
} else if (this.networkId !== newNetworkId) {
this.networkId = newNetworkId;
this.dispatcher.encounteredBlockchainError('');
await this.fetchTokenInformationAsync();
await this.rehydrateStoreWithContractEvents();
}
}
public async userAddressUpdatedFireAndForgetAsync(newUserAddress: string) {
if (this.userAddress !== newUserAddress) {
this.userAddress = newUserAddress;
await this.fetchTokenInformationAsync();
await this.rehydrateStoreWithContractEvents();
}
}
public async nodeVersionUpdatedFireAndForgetAsync(nodeVersion: string) {
if (this.nodeVersion !== nodeVersion) {
this.nodeVersion = nodeVersion;
}
}
public async isAddressInTokenRegistryAsync(tokenAddress: string): Promise<boolean> {
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
const tokenIfExists = await this.zeroEx.tokenRegistry.getTokenIfExistsAsync(tokenAddress);
return !_.isUndefined(tokenIfExists);
}
public getLedgerDerivationPathIfExists(): string {
if (_.isUndefined(this.ledgerSubprovider)) {
return undefined;
}
const path = this.ledgerSubprovider.getPath();
return path;
}
public updateLedgerDerivationPathIfExists(path: string) {
if (_.isUndefined(this.ledgerSubprovider)) {
return; // noop
}
this.ledgerSubprovider.setPath(path);
}
public updateLedgerDerivationIndex(pathIndex: number) {
if (_.isUndefined(this.ledgerSubprovider)) {
return; // noop
}
this.ledgerSubprovider.setPathIndex(pathIndex);
}
public async providerTypeUpdatedFireAndForgetAsync(providerType: ProviderType) {
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.isMainnetEnabled ?
constants.MAINNET_NETWORK_ID :
constants.TESTNET_NETWORK_ID;
provider.addProvider(new RedundantRPCSubprovider(
constants.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;
}
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;
}
default:
throw utils.spawnSwitchErr('providerType', providerType);
}
await this.fetchTokenInformationAsync();
}
public async setProxyAllowanceAsync(token: Token, amountInBaseUnits: BigNumber): Promise<void> {
utils.assert(this.isValidAddress(token.address), BlockchainCallErrs.TOKEN_ADDRESS_IS_INVALID);
utils.assert(this.doesUserAddressExist(), BlockchainCallErrs.USER_HAS_NO_ASSOCIATED_ADDRESSES);
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
const txHash = await this.zeroEx.token.setProxyAllowanceAsync(
token.address, this.userAddress, amountInBaseUnits,
);
await this.showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
const allowance = amountInBaseUnits;
this.dispatcher.replaceTokenAllowanceByAddress(token.address, allowance);
}
public async transferAsync(token: Token, toAddress: string,
amountInBaseUnits: BigNumber): Promise<void> {
const txHash = await this.zeroEx.token.transferAsync(
token.address, this.userAddress, toAddress, amountInBaseUnits,
);
await this.showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
const etherScanLinkIfExists = utils.getEtherScanLinkIfExists(txHash, this.networkId, EtherscanLinkSuffixes.tx);
this.dispatcher.showFlashMessage(React.createElement(TokenSendCompleted, {
etherScanLinkIfExists,
token,
toAddress,
amountInBaseUnits,
}));
}
public portalOrderToSignedOrder(maker: string, taker: string, makerTokenAddress: string,
takerTokenAddress: string, makerTokenAmount: BigNumber,
takerTokenAmount: BigNumber, makerFee: BigNumber,
takerFee: BigNumber, expirationUnixTimestampSec: BigNumber,
feeRecipient: string,
signatureData: SignatureData, salt: BigNumber): SignedOrder {
const ecSignature = signatureData;
const exchangeContractAddress = this.getExchangeContractAddressIfExists();
const takerOrNullAddress = _.isEmpty(taker) ? constants.NULL_ADDRESS : taker;
const signedOrder = {
ecSignature,
exchangeContractAddress,
expirationUnixTimestampSec,
feeRecipient,
maker,
makerFee,
makerTokenAddress,
makerTokenAmount,
salt,
taker: takerOrNullAddress,
takerFee,
takerTokenAddress,
takerTokenAmount,
};
return signedOrder;
}
public async fillOrderAsync(signedOrder: SignedOrder,
fillTakerTokenAmount: BigNumber): Promise<BigNumber> {
utils.assert(this.doesUserAddressExist(), BlockchainCallErrs.USER_HAS_NO_ASSOCIATED_ADDRESSES);
const shouldThrowOnInsufficientBalanceOrAllowance = true;
const txHash = await this.zeroEx.exchange.fillOrderAsync(
signedOrder, fillTakerTokenAmount, shouldThrowOnInsufficientBalanceOrAllowance, this.userAddress,
);
const receipt = await this.showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
const logs: Array<LogWithDecodedArgs<ExchangeContractEventArgs>> = receipt.logs as any;
this.zeroEx.exchange.throwLogErrorsAsErrors(logs);
const logFill = _.find(logs, {event: 'LogFill'});
const args = logFill.args as any as LogFillContractEventArgs;
const filledTakerTokenAmount = args.filledTakerTokenAmount;
return filledTakerTokenAmount;
}
public async cancelOrderAsync(signedOrder: SignedOrder,
cancelTakerTokenAmount: BigNumber): Promise<BigNumber> {
const txHash = await this.zeroEx.exchange.cancelOrderAsync(
signedOrder, cancelTakerTokenAmount,
);
const receipt = await this.showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
const logs: Array<LogWithDecodedArgs<ExchangeContractEventArgs>> = receipt.logs as any;
this.zeroEx.exchange.throwLogErrorsAsErrors(logs);
const logCancel = _.find(logs, {event: ExchangeEvents.LogCancel});
const args = logCancel.args as any as LogCancelContractEventArgs;
const cancelledTakerTokenAmount = args.cancelledTakerTokenAmount;
return cancelledTakerTokenAmount;
}
public async getUnavailableTakerAmountAsync(orderHash: string): Promise<BigNumber> {
utils.assert(ZeroEx.isValidOrderHash(orderHash), 'Must be valid orderHash');
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
const unavailableTakerAmount = await this.zeroEx.exchange.getUnavailableTakerAmountAsync(orderHash);
return unavailableTakerAmount;
}
public getExchangeContractAddressIfExists() {
return this.exchangeAddress;
}
public async validateFillOrderThrowIfInvalidAsync(signedOrder: SignedOrder,
fillTakerTokenAmount: BigNumber,
takerAddress: string): Promise<void> {
await this.zeroEx.exchange.validateFillOrderThrowIfInvalidAsync(
signedOrder, fillTakerTokenAmount, takerAddress);
}
public async validateCancelOrderThrowIfInvalidAsync(order: Order,
cancelTakerTokenAmount: BigNumber): Promise<void> {
await this.zeroEx.exchange.validateCancelOrderThrowIfInvalidAsync(order, cancelTakerTokenAmount);
}
public isValidAddress(address: string): boolean {
const lowercaseAddress = address.toLowerCase();
return this.web3Wrapper.isAddress(lowercaseAddress);
}
public async pollTokenBalanceAsync(token: Token) {
utils.assert(this.doesUserAddressExist(), BlockchainCallErrs.USER_HAS_NO_ASSOCIATED_ADDRESSES);
const [currBalance] = await this.getTokenBalanceAndAllowanceAsync(this.userAddress, token.address);
this.zrxPollIntervalId = window.setInterval(async () => {
const [balance] = await this.getTokenBalanceAndAllowanceAsync(this.userAddress, token.address);
if (!balance.eq(currBalance)) {
this.dispatcher.replaceTokenBalanceByAddress(token.address, balance);
clearInterval(this.zrxPollIntervalId);
delete this.zrxPollIntervalId;
}
}, 5000);
}
public async signOrderHashAsync(orderHash: string): Promise<SignatureData> {
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
const makerAddress = this.userAddress;
// If makerAddress is undefined, this means they have a web3 instance injected into their browser
// but no account addresses associated with it.
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);
const signatureData = _.extend({}, ecSignature, {
hash: orderHash,
});
this.dispatcher.updateSignatureData(signatureData);
return signatureData;
}
public async mintTestTokensAsync(token: Token) {
utils.assert(this.doesUserAddressExist(), BlockchainCallErrs.USER_HAS_NO_ASSOCIATED_ADDRESSES);
const mintableContract = await this.instantiateContractIfExistsAsync(MintableArtifacts, token.address);
await mintableContract.mint(constants.MINT_AMOUNT, {
from: this.userAddress,
});
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);
return balance;
}
public async convertEthToWrappedEthTokensAsync(amount: BigNumber): Promise<void> {
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
utils.assert(this.doesUserAddressExist(), BlockchainCallErrs.USER_HAS_NO_ASSOCIATED_ADDRESSES);
const txHash = await this.zeroEx.etherToken.depositAsync(amount, this.userAddress);
await this.showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
}
public async convertWrappedEthTokensToEthAsync(amount: BigNumber): Promise<void> {
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
utils.assert(this.doesUserAddressExist(), BlockchainCallErrs.USER_HAS_NO_ASSOCIATED_ADDRESSES);
const txHash = await this.zeroEx.etherToken.withdrawAsync(amount, this.userAddress);
await this.showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
}
public async doesContractExistAtAddressAsync(address: string) {
const doesContractExist = await this.web3Wrapper.doesContractExistAtAddressAsync(address);
return doesContractExist;
}
public async getCurrentUserTokenBalanceAndAllowanceAsync(tokenAddress: string): Promise<BigNumber[]> {
const tokenBalanceAndAllowance = await this.getTokenBalanceAndAllowanceAsync(this.userAddress, tokenAddress);
return tokenBalanceAndAllowance;
}
public async getTokenBalanceAndAllowanceAsync(ownerAddress: string, tokenAddress: string):
Promise<BigNumber[]> {
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
if (_.isEmpty(ownerAddress)) {
const zero = new BigNumber(0);
return [zero, zero];
}
let balance = new BigNumber(0);
let allowance = new BigNumber(0);
if (this.doesUserAddressExist()) {
balance = await this.zeroEx.token.getBalanceAsync(tokenAddress, ownerAddress);
allowance = await this.zeroEx.token.getProxyAllowanceAsync(tokenAddress, ownerAddress);
}
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();
return userAccountsIfExists;
}
// HACK: When a user is using a Ledger, we simply dispatch the selected userAddress, which
// by-passes the web3Wrapper logic for updating the prevUserAddress. We therefore need to
// manually update it. This should only be called by the LedgerConfigDialog.
public updateWeb3WrapperPrevUserAddress(newUserAddress: string) {
this.web3Wrapper.updatePrevUserAddress(newUserAddress);
}
public destroy() {
clearInterval(this.zrxPollIntervalId);
this.web3Wrapper.destroy();
this.stopWatchingExchangeLogFillEvents();
}
private async showEtherScanLinkAndAwaitTransactionMinedAsync(
txHash: string): Promise<TransactionReceiptWithDecodedLogs> {
const etherScanLinkIfExists = utils.getEtherScanLinkIfExists(txHash, this.networkId, EtherscanLinkSuffixes.tx);
this.dispatcher.showFlashMessage(React.createElement(TransactionSubmitted, {
etherScanLinkIfExists,
}));
const receipt = await this.zeroEx.awaitTransactionMinedAsync(txHash);
return receipt;
}
private doesUserAddressExist(): boolean {
return this.userAddress !== '';
}
private async rehydrateStoreWithContractEvents() {
// Ensure we are only ever listening to one set of events
this.stopWatchingExchangeLogFillEvents();
if (!this.doesUserAddressExist()) {
return; // short-circuit
}
if (!_.isUndefined(this.zeroEx)) {
// Since we do not have an index on the `taker` address and want to show
// transactions where an account is either the `maker` or `taker`, we loop
// through all fill events, and filter/cache them client-side.
const filterIndexObj = {};
await this.startListeningForExchangeLogFillEventsAsync(filterIndexObj);
}
}
private async startListeningForExchangeLogFillEventsAsync(indexFilterValues: IndexedFilterValues): Promise<void> {
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
utils.assert(this.doesUserAddressExist(), BlockchainCallErrs.USER_HAS_NO_ASSOCIATED_ADDRESSES);
// Fetch historical logs
await this.fetchHistoricalExchangeLogFillEventsAsync(indexFilterValues);
// Start a subscription for new logs
const exchangeAddress = this.getExchangeContractAddressIfExists();
const subscriptionId = this.zeroEx.exchange.subscribe(
ExchangeEvents.LogFill, indexFilterValues,
async (err: Error, decodedLogEvent: DecodedLogEvent<LogFillContractEventArgs>) => {
if (err) {
// Note: it's not entirely clear from the documentation which
// errors will be thrown by `watch`. For now, let's log the error
// to rollbar and stop watching when one occurs
// tslint:disable-next-line:no-floating-promises
errorReporter.reportAsync(err); // fire and forget
return;
} else {
const decodedLog = decodedLogEvent.log;
if (!this.doesLogEventInvolveUser(decodedLog)) {
return; // We aren't interested in the fill event
}
this.updateLatestFillsBlockIfNeeded(decodedLog.blockNumber);
const fill = await this.convertDecodedLogToFillAsync(decodedLog);
if (decodedLogEvent.isRemoved) {
tradeHistoryStorage.removeFillFromUser(this.userAddress, this.networkId, fill);
} else {
tradeHistoryStorage.addFillToUser(this.userAddress, this.networkId, fill);
}
}
});
}
private async fetchHistoricalExchangeLogFillEventsAsync(indexFilterValues: IndexedFilterValues) {
const fromBlock = tradeHistoryStorage.getFillsLatestBlock(this.userAddress, this.networkId);
const subscriptionOpts: SubscriptionOpts = {
fromBlock,
toBlock: 'latest' as BlockParam,
};
const decodedLogs = await this.zeroEx.exchange.getLogsAsync<LogFillContractEventArgs>(
ExchangeEvents.LogFill, subscriptionOpts, indexFilterValues,
);
for (const decodedLog of decodedLogs) {
if (!this.doesLogEventInvolveUser(decodedLog)) {
continue; // We aren't interested in the fill event
}
this.updateLatestFillsBlockIfNeeded(decodedLog.blockNumber);
const fill = await this.convertDecodedLogToFillAsync(decodedLog);
tradeHistoryStorage.addFillToUser(this.userAddress, this.networkId, fill);
}
}
private async convertDecodedLogToFillAsync(decodedLog: LogWithDecodedArgs<LogFillContractEventArgs>) {
const args = decodedLog.args;
const blockTimestamp = await this.web3Wrapper.getBlockTimestampAsync(decodedLog.blockHash);
const fill = {
filledTakerTokenAmount: args.filledTakerTokenAmount,
filledMakerTokenAmount: args.filledMakerTokenAmount,
logIndex: decodedLog.logIndex,
maker: args.maker,
orderHash: args.orderHash,
taker: args.taker,
makerToken: args.makerToken,
takerToken: args.takerToken,
paidMakerFee: args.paidMakerFee,
paidTakerFee: args.paidTakerFee,
transactionHash: decodedLog.transactionHash,
blockTimestamp,
};
return fill;
}
private doesLogEventInvolveUser(decodedLog: LogWithDecodedArgs<LogFillContractEventArgs>) {
const args = decodedLog.args;
const isUserMakerOrTaker = args.maker === this.userAddress ||
args.taker === this.userAddress;
return isUserMakerOrTaker;
}
private updateLatestFillsBlockIfNeeded(blockNumber: number) {
const isBlockPending = _.isNull(blockNumber);
if (!isBlockPending) {
// Hack: I've observed the behavior where a client won't register certain fill events
// and lowering the cache blockNumber fixes the issue. As a quick fix for now, simply
// set the cached blockNumber 50 below the one returned. This way, upon refreshing, a user
// would still attempt to re-fetch events from the previous 50 blocks, but won't need to
// re-fetch all events in all blocks.
// TODO: Debug if this is a race condition, and apply a more precise fix
const blockNumberToSet = blockNumber - BLOCK_NUMBER_BACK_TRACK < 0 ?
0 :
blockNumber - BLOCK_NUMBER_BACK_TRACK;
tradeHistoryStorage.setFillsLatestBlock(this.userAddress, this.networkId, blockNumberToSet);
}
}
private stopWatchingExchangeLogFillEvents(): void {
this.zeroEx.exchange.unsubscribeAll();
}
private async getTokenRegistryTokensByAddressAsync(): Promise<TokenByAddress> {
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
const tokenRegistryTokens = await this.zeroEx.tokenRegistry.getTokensAsync();
const tokenByAddress: TokenByAddress = {};
_.each(tokenRegistryTokens, (t: ZeroExToken, i: number) => {
// HACK: For now we have a hard-coded list of iconUrls for the dummyTokens
// TODO: Refactor this out and pull the iconUrl directly from the TokenRegistry
const iconUrl = constants.iconUrlBySymbol[t.symbol];
const token: Token = {
iconUrl,
address: t.address,
name: t.name,
symbol: t.symbol,
decimals: t.decimals,
isTracked: false,
isRegistered: true,
};
tokenByAddress[token.address] = token;
});
return tokenByAddress;
}
private async onPageLoadInitFireAndForgetAsync() {
await Blockchain.onPageLoadAsync(); // wait for page to load
// Hack: We need to know the networkId the injectedWeb3 is connected to (if it is defined) in
// order to properly instantiate the web3Wrapper. Since we must use the async call, we cannot
// retrieve it from within the web3Wrapper constructor. This is and should remain the only
// call to a web3 instance outside of web3Wrapper in the entire dapp.
// In addition, if the user has an injectedWeb3 instance that is disconnected from a backing
// Ethereum node, this call will throw. We need to handle this case gracefully
const injectedWeb3 = (window as any).web3;
let networkIdIfExists: number;
if (!_.isUndefined(injectedWeb3)) {
try {
networkIdIfExists = _.parseInt(await promisify<string>(injectedWeb3.version.getNetwork)());
} catch (err) {
// Ignore error and proceed with networkId undefined
}
}
const provider = await Blockchain.getProviderAsync(injectedWeb3, networkIdIfExists);
const networkId = !_.isUndefined(networkIdIfExists) ? networkIdIfExists :
configs.isMainnetEnabled ?
constants.MAINNET_NETWORK_ID :
constants.TESTNET_NETWORK_ID;
const zeroExConfigs = {
networkId,
};
this.zeroEx = new ZeroEx(provider, zeroExConfigs);
this.updateProviderName(injectedWeb3);
const shouldPollUserAddress = true;
this.web3Wrapper = new Web3Wrapper(this.dispatcher, provider, networkId, shouldPollUserAddress);
await this.postInstantiationOrUpdatingProviderZeroExAsync();
}
// This method should always be run after instantiating or updating the provider
// of the ZeroEx instance.
private async postInstantiationOrUpdatingProviderZeroExAsync() {
utils.assert(!_.isUndefined(this.zeroEx), 'ZeroEx must be instantiated.');
this.exchangeAddress = this.zeroEx.exchange.getContractAddress();
}
private updateProviderName(injectedWeb3: Web3) {
const doesInjectedWeb3Exist = !_.isUndefined(injectedWeb3);
const providerName = doesInjectedWeb3Exist ?
Blockchain.getNameGivenProvider(injectedWeb3.currentProvider) :
constants.PUBLIC_PROVIDER_NAME;
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.defaultTrackedTokenSymbols, 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.defaultTrackedTokenSymbols[0]}),
_.find(allTokens, {symbol: configs.defaultTrackedTokenSymbols[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();
c.setProvider(providerObj);
const artifactNetworkConfigs = artifact.networks[this.networkId];
let contractAddress;
if (!_.isUndefined(address)) {
contractAddress = address;
} else if (!_.isUndefined(artifactNetworkConfigs)) {
contractAddress = artifactNetworkConfigs.address;
}
if (!_.isUndefined(contractAddress)) {
const doesContractExist = await this.doesContractExistAtAddressAsync(contractAddress);
if (!doesContractExist) {
utils.consoleLog(`Contract does not exist: ${artifact.contract_name} at ${contractAddress}`);
throw new Error(BlockchainCallErrs.CONTRACT_DOES_NOT_EXIST);
}
}
try {
const contractInstance = _.isUndefined(address) ?
await c.deployed() :
await c.at(address);
return contractInstance;
} catch (err) {
const errMsg = `${err}`;
utils.consoleLog(`Notice: Error encountered: ${err} ${err.stack}`);
if (_.includes(errMsg, 'not been deployed to detected network')) {
throw new Error(BlockchainCallErrs.CONTRACT_DOES_NOT_EXIST);
} else {
await errorReporter.reportAsync(err);
throw new Error(BlockchainCallErrs.UNHANDLED_ERROR);
}
}
}
} // tslint:disable:max-file-line-count
