Feature/redis (#23)

* Fix warning

* (cmake) add a warning about 32/64 conversion problems.

* simple redis clients

* can publish to redis

* redis subscribe

* display messages received per second

* verbose flag

* (cmake) use clang only compile option -Wshorten-64-to-32 when compiling with clang

ws/ws_redis_publish.cpp

@@ -0,0 +1,35 @@
+/*
+ *  ws_redis_publish.cpp
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2019 Machine Zone, Inc. All rights reserved.
+ */
+
+#include <iostream>
+#include <sstream>
+#include "IXRedisClient.h"
+
+namespace ix
+{
+    int ws_redis_publish_main(const std::string& hostname,
+                              int port,
+                              const std::string& channel,
+                              const std::string& message)
+    {
+        RedisClient redisClient;
+        if (!redisClient.connect(hostname, port))
+        {
+            std::cerr << "Cannot connect to redis host" << std::endl;
+            return 1;
+        }
+
+        std::cerr << "Publishing message " << message
+                  << " to " << channel << "..." << std::endl;
+        if (!redisClient.publish(channel, message))
+        {
+            std::cerr << "Error publishing to channel " << channel << std::endl;
+            return 1;
+        }
+
+        return 0;
+    }
+}