feat: add healthcheck for both client and server

The broker is considered healthy if it was successfully able to start.

lib/healthcheck.js

@@ -0,0 +1,9 @@
+const express = require('express');
+const router = express.Router();
+
+module.exports = router;
+
+router.route('/').get(function (req, res, next) {
+  // Only check currently is that the webserver is up
+  res.status(200).json({ ok: true });
+});

lib/webserver.js

@@ -12,6 +12,7 @@ function main({ key = null, cert = null, port = 7341 } = {}, altPort = null) {
 
   app.disable('x-powered-by');
   app.use(bodyParser.json());
+  app.use('/healthcheck', require('./healthcheck'));
 
   if (altPort) {
     port = altPort;

test/functional/healthcheck.test.js

@@ -46,8 +46,6 @@ test('client healthcheck', t => {
   process.env.SECRET = 'secret';
   process.env.PORT = localPort;
   process.env.ACCEPT = 'filters.json';
-  // process.env.BROKER_URL = `http://localhost:${serverPort}`;
-  // process.env.BROKER_ID = '12345';
   process.env.BROKER_TYPE = 'client';
   const client = app.main({ port: port() });