add echo and broadcast server as ws sub-commands

ws/ws_echo_server.cpp

@@ -0,0 +1,68 @@
+/*
+ *  ws_broadcast_server.cpp
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
+ */
+
+#include <iostream>
+#include <sstream>
+#include <ixwebsocket/IXWebSocketServer.h>
+
+namespace ix
+{
+    int ws_echo_server_main(int port)
+    {
+        std::cout << "Listening on port " << port << std::endl;
+
+        ix::WebSocketServer server(port);
+
+        server.setOnConnectionCallback(
+            [&server](std::shared_ptr<ix::WebSocket> webSocket)
+            {
+                webSocket->setOnMessageCallback(
+                    [webSocket, &server](ix::WebSocketMessageType messageType,
+                       const std::string& str,
+                       size_t wireSize,
+                       const ix::WebSocketErrorInfo& error,
+                       const ix::WebSocketOpenInfo& openInfo,
+                       const ix::WebSocketCloseInfo& closeInfo)
+                    {
+                        if (messageType == ix::WebSocket_MessageType_Open)
+                        {
+                            std::cerr << "New connection" << std::endl;
+                            std::cerr << "Uri: " << openInfo.uri << std::endl;
+                            std::cerr << "Headers:" << std::endl;
+                            for (auto it : openInfo.headers)
+                            {
+                                std::cerr << it.first << ": " << it.second << std::endl;
+                            }
+                        }
+                        else if (messageType == ix::WebSocket_MessageType_Close)
+                        {
+                            std::cerr << "Closed connection" << std::endl;
+                        }
+                        else if (messageType == ix::WebSocket_MessageType_Message)
+                        {
+                            std::cerr << "Received "
+                                      << wireSize << " bytes"
+                                      << std::endl;
+                            webSocket->send(str);
+                        }
+                    }
+                );
+            }
+        );
+
+        auto res = server.listen();
+        if (!res.first)
+        {
+            std::cerr << res.second << std::endl;
+            return 1;
+        }
+
+        server.start();
+        server.wait();
+
+        return 0;
+    }
+}