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import { addressUtils } from '@0xproject/utils';
import * as express from 'express';
import * as _ from 'lodash';
import ProviderEngine = require('web3-provider-engine');
import HookedWalletSubprovider = require('web3-provider-engine/subproviders/hooked-wallet');
import NonceSubprovider = require('web3-provider-engine/subproviders/nonce-tracker');
import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
import { EtherRequestQueue } from './ether_request_queue';
import { idManagement } from './id_management';
import { RequestQueue } from './request_queue';
import { rpcUrls } from './rpc_urls';
import { utils } from './utils';
import { ZRXRequestQueue } from './zrx_request_queue';
// HACK: web3 leaks XMLHttpRequest into the global scope and causes requests to hang
// because they are using the wrong XHR package.
// Filed issue: https://github.com/ethereum/web3.js/issues/844
// tslint:disable-next-line:ordered-imports
import * as Web3 from 'web3';
interface RequestQueueByNetworkId {
[networkId: string]: RequestQueue;
}
const DEFAULT_NETWORK_ID = 42; // kovan
export class Handler {
private _etherRequestQueueByNetworkId: RequestQueueByNetworkId = {};
private _zrxRequestQueueByNetworkId: RequestQueueByNetworkId = {};
constructor() {
_.forIn(rpcUrls, (rpcUrl: string, networkId: string) => {
const providerObj = this._createProviderEngine(rpcUrl);
const web3 = new Web3(providerObj);
this._etherRequestQueueByNetworkId[networkId] = new EtherRequestQueue(web3);
this._zrxRequestQueueByNetworkId[networkId] = new ZRXRequestQueue(web3, +networkId);
});
}
public dispenseEther(req: express.Request, res: express.Response) {
this._dispense(req, res, this._etherRequestQueueByNetworkId, 'ETH');
}
public dispenseZRX(req: express.Request, res: express.Response) {
this._dispense(req, res, this._zrxRequestQueueByNetworkId, 'ZRX');
}
private _dispense(
req: express.Request,
res: express.Response,
requestQueueByNetworkId: RequestQueueByNetworkId,
assetSymbol: string,
) {
const recipientAddress = req.params.recipient;
if (_.isUndefined(recipientAddress) || !this._isValidEthereumAddress(recipientAddress)) {
res.status(400).send('INVALID_RECIPIENT_ADDRESS');
return;
}
const networkId = _.get(req.query, 'networkId', DEFAULT_NETWORK_ID);
const requestQueue = _.get(requestQueueByNetworkId, networkId);
if (_.isUndefined(requestQueue)) {
res.status(400).send('INVALID_NETWORK_ID');
return;
}
const lowerCaseRecipientAddress = recipientAddress.toLowerCase();
const didAddToQueue = requestQueue.add(lowerCaseRecipientAddress);
if (!didAddToQueue) {
res.status(503).send('QUEUE_IS_FULL');
return;
}
utils.consoleLog(`Added ${lowerCaseRecipientAddress} to queue: ${assetSymbol} networkId: ${networkId}`);
res.status(200).end();
}
// tslint:disable-next-line:prefer-function-over-method
private _createProviderEngine(rpcUrl: string) {
const engine = new ProviderEngine();
engine.addProvider(new NonceSubprovider());
engine.addProvider(new HookedWalletSubprovider(idManagement));
engine.addProvider(
new RpcSubprovider({
rpcUrl,
}),
);
engine.start();
return engine;
}
// tslint:disable-next-line:prefer-function-over-method
private _isValidEthereumAddress(address: string): boolean {
const lowercaseAddress = address.toLowerCase();
return addressUtils.isAddress(lowercaseAddress);
}
}
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