add ws_chat and ws_connect sub commands to ws

ws/ws_chat.cpp

@@ -0,0 +1,201 @@
+/*
+ *  ws_chat.cpp
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2017-2019 Machine Zone, Inc. All rights reserved.
+ */
+
+//
+// Simple chat program that talks to the node.js server at
+// websocket_chat_server/broacast-server.js
+//
+
+#include <iostream>
+#include <sstream>
+#include <queue>
+#include <ixwebsocket/IXWebSocket.h>
+#include <ixwebsocket/IXSocket.h>
+
+#include "nlohmann/json.hpp"
+
+// for convenience
+using json = nlohmann::json;
+
+namespace ix
+{
+    class WebSocketChat
+    {
+        public:
+            WebSocketChat(const std::string& url,
+                          const std::string& user);
+
+            void subscribe(const std::string& channel);
+            void start();
+            void stop();
+            bool isReady() const;
+
+            void sendMessage(const std::string& text);
+            size_t getReceivedMessagesCount() const;
+
+            std::string encodeMessage(const std::string& text);
+            std::pair<std::string, std::string> decodeMessage(const std::string& str);
+
+        private:
+            std::string _url;
+            std::string _user;
+            ix::WebSocket _webSocket;
+            std::queue<std::string> _receivedQueue;
+
+            void log(const std::string& msg);
+    };
+
+    WebSocketChat::WebSocketChat(const std::string& url,
+                                 const std::string& user) :
+        _url(url),
+        _user(user)
+    {
+        ;
+    }
+
+    void WebSocketChat::log(const std::string& msg)
+    {
+        std::cout << msg << std::endl;
+    }
+
+    size_t WebSocketChat::getReceivedMessagesCount() const
+    {
+        return _receivedQueue.size();
+    }
+
+    bool WebSocketChat::isReady() const
+    {
+        return _webSocket.getReadyState() == ix::WebSocket_ReadyState_Open;
+    }
+
+    void WebSocketChat::stop()
+    {
+        _webSocket.stop();
+    }
+
+    void WebSocketChat::start()
+    {
+        _webSocket.setUrl(_url);
+
+        std::stringstream ss;
+        log(std::string("Connecting to url: ") + _url);
+
+        _webSocket.setOnMessageCallback(
+            [this](ix::WebSocketMessageType messageType,
+               const std::string& str,
+               size_t wireSize,
+               const ix::WebSocketErrorInfo& error,
+               const ix::WebSocketOpenInfo& openInfo,
+               const ix::WebSocketCloseInfo& closeInfo)
+            {
+                std::stringstream ss;
+                if (messageType == ix::WebSocket_MessageType_Open)
+                {
+                    ss << "cmd_websocket_chat: user "
+                       << _user
+                       << " Connected !";
+                       log(ss.str());
+                }
+                else if (messageType == ix::WebSocket_MessageType_Close)
+                {
+                    ss << "cmd_websocket_chat: user "
+                       << _user
+                       << " disconnected !";
+                       log(ss.str());
+                }
+                else if (messageType == ix::WebSocket_MessageType_Message)
+                {
+                    auto result = decodeMessage(str);
+
+                    // Our "chat" / "broacast" node.js server does not send us
+                    // the messages we send, so we don't have to filter it out.
+
+                    // store text
+                    _receivedQueue.push(result.second);
+
+                    ss << std::endl
+                       << result.first << " > " << result.second
+                       << std::endl
+                       << _user << " > ";
+                    log(ss.str());
+                }
+                else if (messageType == ix::WebSocket_MessageType_Error)
+                {
+                    ss << "Connection error: " << error.reason      << std::endl;
+                    ss << "#retries: "         << error.retries     << std::endl;
+                    ss << "Wait time(ms): "    << error.wait_time   << std::endl;
+                    ss << "HTTP Status: "      << error.http_status << std::endl;
+                    log(ss.str());
+                }
+                else
+                {
+                    ss << "Invalid ix::WebSocketMessageType";
+                    log(ss.str());
+                }
+            });
+
+        _webSocket.start();
+    }
+
+    std::pair<std::string, std::string> WebSocketChat::decodeMessage(const std::string& str)
+    {
+        auto j = json::parse(str);
+
+        std::string msg_user = j["user"];
+        std::string msg_text = j["text"];
+
+        return std::pair<std::string, std::string>(msg_user, msg_text);
+    }
+
+    std::string WebSocketChat::encodeMessage(const std::string& text)
+    {
+        json j;
+        j["user"] = _user;
+        j["text"] = text;
+
+        std::string output = j.dump();
+        return output;
+    }
+
+    void WebSocketChat::sendMessage(const std::string& text)
+    {
+        _webSocket.send(encodeMessage(text));
+    }
+
+    void interactiveMain(const std::string& url,
+                         const std::string& user)
+    {
+        std::cout << "Type Ctrl-D to exit prompt..." << std::endl;
+        WebSocketChat webSocketChat(url, user);
+        webSocketChat.start();
+
+        while (true)
+        {
+            std::string text;
+            std::cout << user << " > " << std::flush;
+            std::getline(std::cin, text);
+
+            if (!std::cin)
+            {
+                break;
+            }
+
+            webSocketChat.sendMessage(text);
+        }
+
+        std::cout << std::endl;
+        webSocketChat.stop();
+    }
+
+    int ws_chat_main(const std::string& url,
+                     const std::string& user)
+    {
+        Socket::init();
+        interactiveMain(url, user);
+        return 0;
+    }
+}
+