Adding log class

MongoLog.cc

@@ -0,0 +1,53 @@
+#include "MongoLog.hh"
+
+MongoLog::MongoLog(){
+  fLogLevel = 0;
+
+  char hostname[HOST_NAME_MAX];
+  gethostname(hostname, HOST_NAME_MAX);
+  fHostname = std::string(hostname);
+}
+MongoLog::~MongoLog(){};
+
+int  MongoLog::Initialize(std::string connection_string,
+		std::string db, std::string collection, bool debug){
+  try{
+    mongocxx::uri uri{connection_string};
+    fMongoClient = mongocxx::client(uri);
+    fMongoCollection = fMongoClient[db][collection];
+  }
+  catch(const std::exception &e){
+    std::cout<<"Couldn't initialize the log. So gonna fail then."<<std::endl;
+    return -1;
+  }
+
+  if(debug)
+    fLogLevel = 1;
+  else
+    fLogLevel = 0;
+
+  return 0;
+}
+
+int MongoLog::Entry(std::string message, int priority){
+
+  if(priority >= fLogLevel){
+    try{
+      fMongoCollection.insert_one(bsoncxx::builder::stream::document{} <<
+				  "user" << fHostname <<
+				  "message" << message <<
+				  "priority" << priority <<
+				  bsoncxx::builder::stream::finalize);
+      std::cout<<"("<<priority<<"): "<<message<<std::endl;
+    }
+    catch(const std::exception &e){
+      std::cout<<"Failed to insert log message "<<message<<" ("<<
+	priority<<")"<<std::endl;
+      return -1;
+    }
+  }
+  return 0;
+}
+
+
+

MongoLog.hh

@@ -0,0 +1,44 @@
+#ifndef _MONGOLOG_HH_
+#define _MONGOLOG_HH_
+
+#include <iostream>
+#include <unistd.h>
+#include <limits.h>
+#include <sstream>
+
+#include <mongocxx/client.hpp>
+#include <mongocxx/uri.hpp>
+#include <mongocxx/instance.hpp>
+#include <mongocxx/database.hpp>
+#include <mongocxx/collection.hpp>
+#include <bsoncxx/builder/stream/document.hpp>
+
+class MongoLog{
+  /*
+    Logging class that writes to MongoDB
+  */
+
+public:
+  MongoLog();
+  ~MongoLog();
+
+  int  Initialize(std::string connection_string,
+		  std::string db, std::string collection,
+		  bool debug=false);
+
+  const static int Debug   = 0;  // Verbose output
+  const static int Message = 1;  // Normal output
+  const static int Warning = 2;  // Bad but minor operational impact
+  const static int Error   = 3;  // Major operational impact
+  const static int Fatal   = 4;  // Program gonna die
+
+  int Entry(std::string message, int priority=Message);
+
+private:  
+  mongocxx::client fMongoClient;
+  mongocxx::collection fMongoCollection;
+  std::string fHostname;
+  int fLogLevel;
+};
+
+#endif