Issue #46: Create get_memory_size()

include/agent/linux/get_memory_size.h

+#pragma once
+#include <fstream>
+#include <string>
+#include "agent/linux/open_file.h"
+#include <algorithm>
+
+int get_memory_size();

include/agent/linux/inventory.h

@@ -6,6 +6,7 @@
 #include "agent/linux/get_distro.h"
 #include "agent/linux/get_macaddr.h"
 #include "agent/linux/get_machine_type.h"
+#include "agent/linux/get_memory_size.h"
 #include "agent/linux/get_processor_model.h"
 #include "agent/linux/get_time.h"
 #include "agent/linux/get_user_count.h"

src/linux/get_memory_size.cpp

+/* Copyright (C) 2004-2016 Centro de Computacao Cientifica e Software Livre
+ * Departamento de Informatica - Universidade Federal do Parana - C3SL/UFPR
+ *
+ * This file is part of simmc-agent
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+#include "agent/linux/get_memory_size.h"
+
+int get_memory_size() {
+
+    std::ifstream meminfo_file;
+    std::string line;
+    std::string memsize;
+
+    if (open_file("/proc/meminfo", meminfo_file)) {
+
+        const std::string key = "MemTotal:";
+        std::size_t found;
+
+        while (getline(meminfo_file, line)) {
+
+            found = line.find(key);
+
+            if (found != std::string::npos) {
+                // remove key and 'kB' at the end
+                std::string value = line.substr(found + key.length(),
+                                                line.length() -
+                                                (found+key.length()+3));
+                // remove whitespaces
+                remove_copy(value.begin(), value.end(),
+                            std::back_inserter(memsize), ' ');
+                // convert to integer before returning
+                return std::stoi(memsize);
+            }
+        }
+        // If EOF and no info returned
+        std::string err = "MemTotal not found in /proc/meminfo.";
+        throw err;
+
+    } else {
+
+        std::string err = "Failed to open /proc/meminfo.";
+        throw err;
+
+    }
+
+}

src/linux/inventory.cpp

@@ -51,9 +51,16 @@ Json::Value get_inventory(){
         inv["error"]["processor"] = err;
     }
 
+    try {
+        inv["data"]["memory"] = get_memory_size();
+    }
+    catch ( std::string err ) {
+        inv["data"]["memory"] = Json::nullValue;
+        inv["error"]["memory"] = err;
+    }
+
     // hw info
     /*
-    inv["memory"] =
     inv["disk1_model"] =
     inv["disk1_size"] =
     inv["disk1_used"] =