add example websocket C++ server snake which supports basic cobra ops (publish and subscribe without stream sql

ws/ws_snake.cpp

@@ -0,0 +1,81 @@
+/*
+ *  snake_run.cpp
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
+ */
+
+#include "IXSnakeServer.h"
+
+#include <iostream>
+#include <sstream>
+#include <fstream>
+
+namespace
+{
+    std::vector<uint8_t> load(const std::string& path)
+    {
+        std::vector<uint8_t> memblock;
+
+        std::ifstream file(path);
+        if (!file.is_open()) return memblock;
+
+        file.seekg(0, file.end);
+        std::streamoff size = file.tellg();
+        file.seekg(0, file.beg);
+
+        memblock.resize(size);
+        file.read((char*)&memblock.front(), static_cast<std::streamsize>(size));
+
+        return memblock;
+    }
+
+    std::string readAsString(const std::string& path)
+    {
+        auto vec = load(path);
+        return std::string(vec.begin(), vec.end());
+    }
+}
+
+namespace ix
+{
+    int ws_snake_main(int port,
+                      const std::string& hostname,
+                      const std::string& redisHosts,
+                      int redisPort,
+                      const std::string& redisPassword,
+                      bool verbose,
+                      const std::string& appsConfigPath)
+    {
+        snake::AppConfig appConfig;
+        appConfig.port = port;
+        appConfig.hostname = hostname;
+        appConfig.verbose = verbose;
+        appConfig.redisPort = redisPort;
+        appConfig.redisPassword = redisPassword;
+
+        // Parse config file
+        auto str = readAsString(appsConfigPath);
+        if (str.empty())
+        {
+            std::cout << "Cannot read content of " << appsConfigPath << std::endl;
+            return 1;
+        }
+
+        std::cout << str << std::endl;
+        auto apps = nlohmann::json::parse(str);
+        appConfig.apps = apps["apps"];
+
+        std::string token;
+        std::stringstream tokenStream(redisHosts);
+        while (std::getline(tokenStream, token, ';'))
+        {
+            appConfig.redisHosts.push_back(token);
+        }
+
+        // Display config on the terminal for debugging
+        dumpConfig(appConfig);
+
+        snake::SnakeServer snakeServer(appConfig);
+        return snakeServer.run() ? 0 : 1;
+    }
+}