=Partial commit, have to go home

packages/backend-common/src/service/lib/ServiceBuilderImpl.ts

@@ -38,6 +38,10 @@ import {
   readHttpsSettings,
   HttpsSettings,
 } from './config';
+import {
+  createHttpServer,
+  createHttpsServer,
+} from './hostFactory';
 
 const DEFAULT_PORT = 7000;
 // '' is express default, which listens to all interfaces
@@ -215,7 +219,7 @@ export class ServiceBuilderImpl implements ServiceBuilder {
       } else {
         logger.info('Initializing http server');
 
-        server = http.createServer(app);
+        server = createHttpServer(app);
       }
 
       const stoppableServer = stoppable(

packages/backend-common/src/service/lib/hostFactory.ts

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import express from 'express';
+import * as http from 'http';
+import * as https from 'https';
+
+/**
+ * Reads some base options out of a config object.
+ *
+ * @param config The root of a backend config object
+ * @returns A base options object
+ *
+ * @example
+ * ```json
+ * {
+ *   baseUrl: "http://localhost:7000",
+ *   listen: "0.0.0.0:7000"
+ * }
+ * ```
+ */
+export function createHttpServer(app: express.Express): http.Server {
+  return http.createServer(app);
+}
+
+
+export function createHttpsServer(app: express.Express): http.Server {
+  return https.createServer(app);
+}