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authorFlorent Le Coz <louiz@louiz.org>2013-12-03 18:27:20 +0100
committerFlorent Le Coz <louiz@louiz.org>2013-12-03 19:15:37 +0100
commit2662ed89e2cd41477582140e482f1ddbbfdb235e (patch)
treef34417a650037b369450e735763c1c3a93d78e8b /src/logger
parent6bd176f15ebf146874bc7f4525870e52921cc2fe (diff)
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Add a logger class
Diffstat (limited to 'src/logger')
-rw-r--r--src/logger/logger.cpp41
-rw-r--r--src/logger/logger.hpp70
2 files changed, 111 insertions, 0 deletions
diff --git a/src/logger/logger.cpp b/src/logger/logger.cpp
new file mode 100644
index 0000000..eac833f
--- /dev/null
+++ b/src/logger/logger.cpp
@@ -0,0 +1,41 @@
+#include <utils/make_unique.hpp>
+#include <logger/logger.hpp>
+#include <config/config.hpp>
+
+Logger::Logger(const int log_level):
+ log_level(log_level),
+ stream(std::cout.rdbuf())
+{
+ std::cout << "Logger(1)" << std::endl;
+}
+
+Logger::Logger(const int log_level, const std::string& log_file):
+ log_level(log_level),
+ ofstream(log_file.data(), std::ios_base::app),
+ stream(ofstream.rdbuf())
+{
+ std::cout << "Logger(" << this->log_level << ")" << std::endl;
+}
+
+std::unique_ptr<Logger>& Logger::instance()
+{
+ static std::unique_ptr<Logger> instance;
+
+ if (!instance)
+ {
+ const std::string log_file = Config::get("log_file", "");
+ const int log_level = Config::get_int("log_level", 0);
+ if (log_file.empty())
+ instance = std::make_unique<Logger>(log_level);
+ else
+ instance = std::make_unique<Logger>(log_level, log_file);
+ }
+ return instance;
+}
+
+std::ostream& Logger::get_stream(const int lvl)
+{
+ if (lvl >= this->log_level)
+ return this->stream;
+ return this->null_stream;
+}
diff --git a/src/logger/logger.hpp b/src/logger/logger.hpp
new file mode 100644
index 0000000..182c517
--- /dev/null
+++ b/src/logger/logger.hpp
@@ -0,0 +1,70 @@
+#ifndef LOGGER_INCLUDED
+# define LOGGER_INCLUDED
+
+/**
+ * Singleton used in logger macros to write into files or stdout, with
+ * various levels of severity.
+ * Only the macros should be used.
+ * @class Logger
+ */
+
+#include <memory>
+#include <iostream>
+#include <fstream>
+
+#define debug_lvl 0
+#define info_lvl 1
+#define warning_lvl 2
+#define error_lvl 3
+
+// Macro defined to get the filename instead of the full path. But if it is
+// not properly defined by the build system, we fallback to __FILE__
+#ifndef __FILENAME__
+# define __FILENAME__ __FILE__
+#endif
+
+#define WHERE\
+ __FILENAME__ << ":" << __LINE__
+
+#define log_debug(text)\
+ Logger::instance()->get_stream(debug_lvl) << "[DEBUG]:" << WHERE << ":\t" << text << std::endl;
+
+#define log_info(text)\
+ Logger::instance()->get_stream(info_lvl) << "[INFO]:" << WHERE << ":\t" << text << std::endl;
+
+#define log_warning(text)\
+ Logger::instance()->get_stream(warning_lvl) << "[WARNING]:" << WHERE << ":\t" << text << std::endl;
+
+#define log_error(text)\
+ Logger::instance()->get_stream(error_lvl) << "[ERROR]:" << WHERE << ":\t" << text << std::endl;
+
+/**
+ * Juste a structure representing a stream doing nothing with its input.
+ */
+class nullstream: public std::ostream
+{
+public:
+ nullstream():
+ std::ostream(0)
+ { }
+};
+
+class Logger
+{
+public:
+ static std::unique_ptr<Logger>& instance();
+ std::ostream& get_stream(const int);
+ Logger(const int log_level, const std::string& log_file);
+ Logger(const int log_level);
+
+private:
+ Logger(const Logger&);
+ Logger& operator=(const Logger&);
+
+ const int log_level;
+ std::ofstream ofstream;
+ nullstream null_stream;
+ std::ostream stream;
+};
+
+#endif // LOGGER_INCLUDED