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import * as express from 'express';
import * as _ from 'lodash';
import * as Web3 from 'web3';
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 {configs} from './configs';
import {EtherRequestQueue} from './ether_request_queue';
import {idManagement} from './id_management';
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.
// Issue: https://github.com/trufflesuite/truffle-contract/issues/14
delete (global as any).XMLHttpRequest;
export class Handler {
private etherRequestQueue: EtherRequestQueue;
private zrxRequestQueue: ZRXRequestQueue;
private web3: Web3;
constructor() {
// Setup provider engine to talk with RPC node
const providerObj = this.createProviderEngine(configs.RPC_URL);
this.web3 = new Web3(providerObj);
this.etherRequestQueue = new EtherRequestQueue(this.web3);
this.zrxRequestQueue = new ZRXRequestQueue(this.web3);
}
public dispenseEther(req: express.Request, res: express.Response) {
const recipientAddress = req.params.recipient;
if (_.isUndefined(recipientAddress) || !this.isValidEthereumAddress(recipientAddress)) {
res.status(400).send('INVALID_REQUEST');
return;
}
const lowerCaseRecipientAddress = recipientAddress.toLowerCase();
const didAddToQueue = this.etherRequestQueue.add(lowerCaseRecipientAddress);
if (!didAddToQueue) {
res.status(503).send('QUEUE_IS_FULL');
return;
}
utils.consoleLog(`Added ${lowerCaseRecipientAddress} to the ETH queue`);
res.status(200).end();
}
public dispenseZRX(req: express.Request, res: express.Response) {
const recipientAddress = req.params.recipient;
if (_.isUndefined(recipientAddress) || !this.isValidEthereumAddress(recipientAddress)) {
res.status(400).send('INVALID_REQUEST');
return;
}
const lowerCaseRecipientAddress = recipientAddress.toLowerCase();
const didAddToQueue = this.zrxRequestQueue.add(lowerCaseRecipientAddress);
if (!didAddToQueue) {
res.status(503).send('QUEUE_IS_FULL');
return;
}
utils.consoleLog(`Added ${lowerCaseRecipientAddress} to the ZRX queue`);
res.status(200).end();
}
public getQueueInfo(req: express.Request, res: express.Response) {
res.setHeader('Content-Type', 'application/json');
const payload = JSON.stringify({
ether: {
full: this.etherRequestQueue.isFull(),
size: this.etherRequestQueue.size(),
},
zrx: {
full: this.zrxRequestQueue.isFull(),
size: this.zrxRequestQueue.size(),
},
});
res.status(200).send(payload);
}
// 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;
}
private isValidEthereumAddress(address: string): boolean {
const lowercaseAddress = address.toLowerCase();
return this.web3.isAddress(lowercaseAddress);
}
}
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