Move app/server to flipper-server-core

Summary: moved `app/src/server` to `flipper-server-core/src` and fixed any fallout from that (aka integration points I missed on the preparing diffs).

Reviewed By: passy

Differential Revision: D31541378

fbshipit-source-id: 8a7e0169ebefa515781f6e5e0f7b926415d4b7e9

desktop/flipper-server-core/src/comms/ServerFactory.tsx

@@ -0,0 +1,88 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {SecureServerConfig} from '../utils/CertificateProvider';
+import ServerAdapter, {ServerEventsListener} from './ServerAdapter';
+import ServerRSocket from './ServerRSocket';
+import ServerWebSocket from './ServerWebSocket';
+import ServerWebSocketBrowser from './ServerWebSocketBrowser';
+
+export enum TransportType {
+  RSocket,
+  WebSocket,
+}
+
+/**
+ * Creates a server to be used by Flipper. The created server will be set into
+ * the promise once it has started and bound to the specified port.
+ * @param port A port number in which to listen for incoming connections.
+ * @param listener An object implementing the ServerEventsListener interface.
+ * @param sslConfig An SSL configuration for TLS servers.
+ */
+export function createServer(
+  port: number,
+  listener: ServerEventsListener,
+  sslConfig?: SecureServerConfig,
+  transportType: TransportType = TransportType.RSocket,
+): Promise<ServerAdapter> {
+  return new Promise((resolve, reject) => {
+    const server =
+      transportType === TransportType.RSocket
+        ? new ServerRSocket(listener)
+        : new ServerWebSocket(listener);
+    server
+      .start(port, sslConfig)
+      .then((started) => {
+        if (started) {
+          resolve(server);
+        } else {
+          reject(
+            new Error(`An error occurred whilst trying
+                     to start the server listening at port ${port}`),
+          );
+        }
+      })
+      .catch((error: any) => {
+        reject(error);
+      });
+  });
+}
+
+/**
+ * Creates a server to be used by Flipper to allow Browser connections.
+ * The protocol is slightly different for Browser connections hence a different
+ * factory method. The created server will be set into the promise
+ * once it has started and bound to the specified port.
+ * @param port A port number in which to listen for incoming connections.
+ * @param listener An object implementing the ServerEventsListener interface.
+ * @returns
+ */
+export function createBrowserServer(
+  port: number,
+  listener: ServerEventsListener,
+): Promise<ServerAdapter> {
+  return new Promise((resolve, reject) => {
+    const server = new ServerWebSocketBrowser(listener);
+    server
+      .start(port)
+      .then((started) => {
+        if (started) {
+          resolve(server);
+        } else {
+          reject(
+            new Error(`An error occurred whilst trying
+                     to start the server listening at port ${port}`),
+          );
+        }
+      })
+      .catch((error: any) => {
+        reject(error);
+      });
+  });
+}