summaryrefslogtreecommitdiff
path: root/louloulibs/logger/logger.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'louloulibs/logger/logger.hpp')
-rw-r--r--louloulibs/logger/logger.hpp126
1 files changed, 126 insertions, 0 deletions
diff --git a/louloulibs/logger/logger.hpp b/louloulibs/logger/logger.hpp
new file mode 100644
index 0000000..0893c77
--- /dev/null
+++ b/louloulibs/logger/logger.hpp
@@ -0,0 +1,126 @@
+#pragma once
+
+
+/**
+ * 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
+
+#include "louloulibs.h"
+#ifdef SYSTEMD_FOUND
+# include <systemd/sd-daemon.h>
+#else
+# define SD_DEBUG "[DEBUG]: "
+# define SD_INFO "[INFO]: "
+# define SD_WARNING "[WARNING]: "
+# define SD_ERR "[ERROR]: "
+#endif
+
+// 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
+
+/**
+ * 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);
+
+ Logger(const Logger&) = delete;
+ Logger& operator=(const Logger&) = delete;
+ Logger(Logger&&) = delete;
+ Logger& operator=(Logger&&) = delete;
+
+private:
+ const int log_level;
+ std::ofstream ofstream;
+ nullstream null_stream;
+ std::ostream stream;
+};
+
+#define WHERE __FILENAME__, ":", __LINE__, ":\t"
+
+namespace logging_details
+{
+ template <typename T>
+ void log(std::ostream& os, const T& arg)
+ {
+ os << arg << std::endl;
+ }
+
+ template <typename T, typename... U>
+ void log(std::ostream& os, const T& first, U&&... rest)
+ {
+ os << first;
+ log(os, std::forward<U>(rest)...);
+ }
+
+ template <typename... U>
+ void log_debug(U&&... args)
+ {
+ auto& os = Logger::instance()->get_stream(debug_lvl);
+ os << SD_DEBUG;
+ log(os, std::forward<U>(args)...);
+ }
+
+ template <typename... U>
+ void log_info(U&&... args)
+ {
+ auto& os = Logger::instance()->get_stream(info_lvl);
+ os << SD_INFO;
+ log(os, std::forward<U>(args)...);
+ }
+
+ template <typename... U>
+ void log_warning(U&&... args)
+ {
+ auto& os = Logger::instance()->get_stream(warning_lvl);
+ os << SD_WARNING;
+ log(os, std::forward<U>(args)...);
+ }
+
+ template <typename... U>
+ void log_error(U&&... args)
+ {
+ auto& os = Logger::instance()->get_stream(error_lvl);
+ os << SD_ERR;
+ log(os, std::forward<U>(args)...);
+ }
+}
+
+#define log_info(...) logging_details::log_info(WHERE, __VA_ARGS__)
+
+#define log_warning(...) logging_details::log_warning(WHERE, __VA_ARGS__)
+
+#define log_error(...) logging_details::log_error(WHERE, __VA_ARGS__)
+
+#define log_debug(...) logging_details::log_debug(WHERE, __VA_ARGS__)
+
+
+