11 files changed, 386 insertions, 0 deletions
diff --git a/packages/testnet-faucets/src/ts/configs.ts b/packages/testnet-faucets/src/ts/configs.ts
new file mode 100644
index 000000000..038c8e22a
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/configs.ts
@@ -0,0 +1,7 @@
+export const configs = {
+    DISPENSER_ADDRESS: (process.env.DISPENSER_ADDRESS as string).toLowerCase(),
+    DISPENSER_PRIVATE_KEY: process.env.DISPENSER_PRIVATE_KEY,
+    ENVIRONMENT: process.env.FAUCET_ENVIRONMENT,
+    INFURA_API_KEY: process.env.INFURA_API_KEY,
+    ROLLBAR_ACCESS_KEY: process.env.FAUCET_ROLLBAR_ACCESS_KEY,
+};
diff --git a/packages/testnet-faucets/src/ts/error_reporter.ts b/packages/testnet-faucets/src/ts/error_reporter.ts
new file mode 100644
index 000000000..6865d3893
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/error_reporter.ts
@@ -0,0 +1,40 @@
+import * as express from 'express';
+import rollbar = require('rollbar');
+
+import { configs } from './configs';
+import { utils } from './utils';
+
+export const errorReporter = {
+    setup() {
+        rollbar.init(configs.ROLLBAR_ACCESS_KEY, {
+            environment: configs.ENVIRONMENT,
+        });
+
+        rollbar.handleUncaughtExceptions(configs.ROLLBAR_ACCESS_KEY);
+
+        process.on('unhandledRejection', async (err: Error) => {
+            utils.consoleLog(`Uncaught exception ${err}. Stack: ${err.stack}`);
+            await this.reportAsync(err);
+            process.exit(1);
+        });
+    },
+    async reportAsync(err: Error, req?: express.Request): Promise<any> {
+        if (configs.ENVIRONMENT === 'development') {
+            return; // Do not log development environment errors
+        }
+
+        return new Promise((resolve, reject) => {
+            rollbar.handleError(err, req, (rollbarErr: Error) => {
+                if (rollbarErr) {
+                    utils.consoleLog(`Error reporting to rollbar, ignoring: ${rollbarErr}`);
+                    reject(rollbarErr);
+                } else {
+                    resolve();
+                }
+            });
+        });
+    },
+    errorHandler() {
+        return rollbar.errorHandler(configs.ROLLBAR_ACCESS_KEY);
+    },
+};
diff --git a/packages/testnet-faucets/src/ts/ether_request_queue.ts b/packages/testnet-faucets/src/ts/ether_request_queue.ts
new file mode 100644
index 000000000..1c4b19ab9
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/ether_request_queue.ts
@@ -0,0 +1,27 @@
+import { promisify } from '@0xproject/utils';
+import * as _ from 'lodash';
+
+import { configs } from './configs';
+import { errorReporter } from './error_reporter';
+import { RequestQueue } from './request_queue';
+import { utils } from './utils';
+
+const DISPENSE_AMOUNT_ETHER = 0.1;
+
+export class EtherRequestQueue extends RequestQueue {
+    protected async processNextRequestFireAndForgetAsync(recipientAddress: string) {
+        utils.consoleLog(`Processing ETH ${recipientAddress}`);
+        const sendTransactionAsync = promisify(this.web3.eth.sendTransaction);
+        try {
+            const txHash = await sendTransactionAsync({
+                from: configs.DISPENSER_ADDRESS,
+                to: recipientAddress,
+                value: this.web3.toWei(DISPENSE_AMOUNT_ETHER, 'ether'),
+            });
+            utils.consoleLog(`Sent ${DISPENSE_AMOUNT_ETHER} ETH to ${recipientAddress} tx: ${txHash}`);
+        } catch (err) {
+            utils.consoleLog(`Unexpected err: ${err} - ${JSON.stringify(err)}`);
+            await errorReporter.reportAsync(err);
+        }
+    }
+}
diff --git a/packages/testnet-faucets/src/ts/global.d.ts b/packages/testnet-faucets/src/ts/global.d.ts
new file mode 100644
index 000000000..97cd35680
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/global.d.ts
@@ -0,0 +1,26 @@
+declare module 'rollbar';
+declare module 'web3-provider-engine';
+declare module 'web3-provider-engine/subproviders/rpc';
+declare module 'web3-provider-engine/subproviders/nonce-tracker';
+declare module 'web3-provider-engine/subproviders/hooked-wallet';
+
+declare module '*.json' {
+    const json: any;
+    /* tslint:disable */
+    export default json;
+    /* tslint:enable */
+}
+
+// Ethereumjs-tx declarations
+declare module 'ethereumjs-tx' {
+    class EthereumTx {
+        public raw: Buffer[];
+        public r: Buffer;
+        public s: Buffer;
+        public v: Buffer;
+        public serialize(): Buffer;
+        public sign(buffer: Buffer): void;
+        constructor(txParams: any);
+    }
+    export = EthereumTx;
+}
diff --git a/packages/testnet-faucets/src/ts/handler.ts b/packages/testnet-faucets/src/ts/handler.ts
new file mode 100644
index 000000000..bf5b3e81e
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/handler.ts
@@ -0,0 +1,114 @@
+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;
+}
+
+enum QueueType {
+    ETH = 'ETH',
+    ZRX = 'ZRX',
+}
+
+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 getQueueInfo(req: express.Request, res: express.Response) {
+        res.setHeader('Content-Type', 'application/json');
+        const queueInfo = _.mapValues(rpcUrls, (rpcUrl: string, networkId: string) => {
+            utils.consoleLog(networkId);
+            const etherRequestQueue = this._etherRequestQueueByNetworkId[networkId];
+            const zrxRequestQueue = this._zrxRequestQueueByNetworkId[networkId];
+            return {
+                ether: {
+                    full: etherRequestQueue.isFull(),
+                    size: etherRequestQueue.size(),
+                },
+                zrx: {
+                    full: zrxRequestQueue.isFull(),
+                    size: zrxRequestQueue.size(),
+                },
+            };
+        });
+        const payload = JSON.stringify(queueInfo);
+        res.status(200).send(payload);
+    }
+    public dispenseEther(req: express.Request, res: express.Response) {
+        this._dispense(req, res, this._etherRequestQueueByNetworkId, QueueType.ETH);
+    }
+    public dispenseZRX(req: express.Request, res: express.Response) {
+        this._dispense(req, res, this._zrxRequestQueueByNetworkId, QueueType.ZRX);
+    }
+    private _dispense(
+        req: express.Request,
+        res: express.Response,
+        requestQueueByNetworkId: RequestQueueByNetworkId,
+        queueType: QueueType,
+    ) {
+        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: ${queueType} networkId: ${networkId}`);
+        res.status(200).end();
+    }
+    // tslint:disable-next-line:prefer-function-over-method
+    private _createProviderEngine(rpcUrl: string) {
+        const engine = new ProviderEngine();
+        engine.addProvider(new NonceSubprovider());
+        engine.addProvider(new HookedWalletSubprovider(idManagement));
+        engine.addProvider(
+            new RpcSubprovider({
+                rpcUrl,
+            }),
+        );
+        engine.start();
+        return engine;
+    }
+    // tslint:disable-next-line:prefer-function-over-method
+    private _isValidEthereumAddress(address: string): boolean {
+        const lowercaseAddress = address.toLowerCase();
+        return addressUtils.isAddress(lowercaseAddress);
+    }
+}
diff --git a/packages/testnet-faucets/src/ts/id_management.ts b/packages/testnet-faucets/src/ts/id_management.ts
new file mode 100644
index 000000000..db9b610a3
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/id_management.ts
@@ -0,0 +1,21 @@
+import EthereumTx = require('ethereumjs-tx');
+
+import { configs } from './configs';
+
+type Callback = (err: Error | null, accounts: any) => void;
+
+export const idManagement = {
+    getAccounts(callback: Callback) {
+        callback(null, [configs.DISPENSER_ADDRESS]);
+    },
+    approveTransaction(txData: object, callback: Callback) {
+        callback(null, true);
+    },
+    signTransaction(txData: object, callback: Callback) {
+        const tx = new EthereumTx(txData);
+        const privateKeyBuffer = new Buffer(configs.DISPENSER_PRIVATE_KEY as string, 'hex');
+        tx.sign(privateKeyBuffer);
+        const rawTx = `0x${tx.serialize().toString('hex')}`;
+        callback(null, rawTx);
+    },
+};
diff --git a/packages/testnet-faucets/src/ts/request_queue.ts b/packages/testnet-faucets/src/ts/request_queue.ts
new file mode 100644
index 000000000..20f2833a1
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/request_queue.ts
@@ -0,0 +1,56 @@
+import * as _ from 'lodash';
+import * as timers from 'timers';
+
+// 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';
+
+const MAX_QUEUE_SIZE = 500;
+const DEFAULT_QUEUE_INTERVAL_MS = 1000;
+
+export class RequestQueue {
+    protected queueIntervalMs: number;
+    protected queue: string[];
+    protected queueIntervalId: NodeJS.Timer;
+    protected web3: Web3;
+    constructor(web3: any) {
+        this.queueIntervalMs = DEFAULT_QUEUE_INTERVAL_MS;
+        this.queue = [];
+
+        this.web3 = web3;
+
+        this.start();
+    }
+    public add(recipientAddress: string): boolean {
+        if (this.isFull()) {
+            return false;
+        }
+        this.queue.push(recipientAddress);
+        return true;
+    }
+    public size(): number {
+        return this.queue.length;
+    }
+    public isFull(): boolean {
+        return this.size() >= MAX_QUEUE_SIZE;
+    }
+    protected start() {
+        this.queueIntervalId = timers.setInterval(() => {
+            const recipientAddress = this.queue.shift();
+            if (_.isUndefined(recipientAddress)) {
+                return;
+            }
+            // tslint:disable-next-line:no-floating-promises
+            this.processNextRequestFireAndForgetAsync(recipientAddress);
+        }, this.queueIntervalMs);
+    }
+    protected stop() {
+        clearInterval(this.queueIntervalId);
+    }
+    // tslint:disable-next-line:prefer-function-over-method
+    protected async processNextRequestFireAndForgetAsync(recipientAddress: string) {
+        throw new Error('Expected processNextRequestFireAndForgetAsync to be implemented by a subclass');
+    }
+}
diff --git a/packages/testnet-faucets/src/ts/rpc_urls.ts b/packages/testnet-faucets/src/ts/rpc_urls.ts
new file mode 100644
index 000000000..25a3b938f
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/rpc_urls.ts
@@ -0,0 +1,13 @@
+import { configs } from './configs';
+
+const productionRpcUrls = {
+    '2': `https://ropsten.infura.io/${configs.INFURA_API_KEY}`,
+    '3': `https://rinkeby.infura.io/${configs.INFURA_API_KEY}`,
+    '42': `https://kovan.infura.io/${configs.INFURA_API_KEY}`,
+};
+
+const developmentRpcUrls = {
+    '50': 'http://127.0.0.1:8545',
+};
+
+export const rpcUrls = configs.ENVIRONMENT === 'development' ? developmentRpcUrls : productionRpcUrls;
diff --git a/packages/testnet-faucets/src/ts/server.ts b/packages/testnet-faucets/src/ts/server.ts
new file mode 100644
index 000000000..26edfff5a
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/server.ts
@@ -0,0 +1,29 @@
+import * as bodyParser from 'body-parser';
+import * as express from 'express';
+
+import { errorReporter } from './error_reporter';
+import { Handler } from './handler';
+
+// Setup the errorReporter to catch uncaught exceptions and unhandled rejections
+errorReporter.setup();
+
+const app = express();
+app.use(bodyParser.json()); // for parsing application/json
+app.use((req, res, next) => {
+    res.header('Access-Control-Allow-Origin', '*');
+    res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
+    next();
+});
+
+const handler = new Handler();
+app.get('/ping', (req: express.Request, res: express.Response) => {
+    res.status(200).send('pong');
+});
+app.get('/info', handler.getQueueInfo.bind(handler));
+app.get('/ether/:recipient', handler.dispenseEther.bind(handler));
+app.get('/zrx/:recipient', handler.dispenseZRX.bind(handler));
+
+// Log to rollbar any errors unhandled by handlers
+app.use(errorReporter.errorHandler());
+const port = process.env.PORT || 3000;
+app.listen(port);
diff --git a/packages/testnet-faucets/src/ts/utils.ts b/packages/testnet-faucets/src/ts/utils.ts
new file mode 100644
index 000000000..893f82ca3
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/utils.ts
@@ -0,0 +1,7 @@
+export const utils = {
+    consoleLog(message: string) {
+        /* tslint:disable */
+        console.log(message);
+        /* tslint:enable */
+    },
+};
diff --git a/packages/testnet-faucets/src/ts/zrx_request_queue.ts b/packages/testnet-faucets/src/ts/zrx_request_queue.ts
new file mode 100644
index 000000000..3d73f9dd2
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/zrx_request_queue.ts
@@ -0,0 +1,46 @@
+import { ZeroEx } from '0x.js';
+import { BigNumber } from '@0xproject/utils';
+import * as _ from 'lodash';
+
+import { configs } from './configs';
+import { errorReporter } from './error_reporter';
+import { RequestQueue } from './request_queue';
+import { utils } from './utils';
+
+// 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';
+
+const DISPENSE_AMOUNT_ZRX = new BigNumber(0.1);
+const QUEUE_INTERVAL_MS = 5000;
+
+export class ZRXRequestQueue extends RequestQueue {
+    private _zeroEx: ZeroEx;
+    constructor(web3: Web3, networkId: number) {
+        super(web3);
+        this.queueIntervalMs = QUEUE_INTERVAL_MS;
+        const zeroExConfig = {
+            networkId,
+        };
+        this._zeroEx = new ZeroEx(web3.currentProvider, zeroExConfig);
+    }
+    protected async processNextRequestFireAndForgetAsync(recipientAddress: string) {
+        utils.consoleLog(`Processing ZRX ${recipientAddress}`);
+        const baseUnitAmount = ZeroEx.toBaseUnitAmount(DISPENSE_AMOUNT_ZRX, 18);
+        try {
+            const zrxTokenAddress = this._zeroEx.exchange.getZRXTokenAddress();
+            const txHash = await this._zeroEx.token.transferAsync(
+                zrxTokenAddress,
+                configs.DISPENSER_ADDRESS,
+                recipientAddress,
+                baseUnitAmount,
+            );
+            utils.consoleLog(`Sent ${DISPENSE_AMOUNT_ZRX} ZRX to ${recipientAddress} tx: ${txHash}`);
+        } catch (err) {
+            utils.consoleLog(`Unexpected err: ${err} - ${JSON.stringify(err)}`);
+            await errorReporter.reportAsync(err);
+        }
+    }
+}