1 files changed, 142 insertions, 0 deletions
diff --git a/include/crow/logging.h b/include/crow/logging.h
new file mode 100644
index 0000000..9c8bfbb
--- /dev/null
+++ b/include/crow/logging.h
@@ -0,0 +1,142 @@
+#pragma once
+
+#include <string>
+#include <cstdio>
+#include <cstdlib>
+#include <ctime>
+#include <iostream>
+#include <sstream>
+
+#include "crow/settings.h"
+
+namespace crow
+{
+    enum class LogLevel
+    {
+#ifndef ERROR
+        DEBUG = 0,
+        INFO,
+        WARNING,
+        ERROR,
+        CRITICAL,
+#endif
+
+        Debug = 0,
+        Info,
+        Warning,
+        Error,
+        Critical,
+    };
+
+    class ILogHandler {
+        public:
+            virtual void log(std::string message, LogLevel level) = 0;
+    };
+
+    class CerrLogHandler : public ILogHandler {
+        public:
+            void log(std::string message, LogLevel /*level*/) override {
+                std::cerr << message;
+            }
+    };
+
+    class logger {
+
+        private:
+            //
+            static std::string timestamp()
+            {
+                char date[32];
+                time_t t = time(0);
+
+                tm my_tm;
+
+#ifdef _MSC_VER
+                gmtime_s(&my_tm, &t);
+#else
+                gmtime_r(&t, &my_tm);
+#endif
+
+                size_t sz = strftime(date, sizeof(date), "%Y-%m-%d %H:%M:%S", &my_tm);
+                return std::string(date, date+sz);
+            }
+
+        public:
+
+
+            logger(std::string prefix, LogLevel level) : level_(level) {
+    #ifdef CROW_ENABLE_LOGGING
+                    stringstream_ << "(" << timestamp() << ") [" << prefix << "] ";
+    #endif
+
+            }
+            ~logger() {
+    #ifdef CROW_ENABLE_LOGGING
+                if(level_ >= get_current_log_level()) {
+                    stringstream_ << std::endl;
+                    get_handler_ref()->log(stringstream_.str(), level_);
+                }
+    #endif
+            }
+
+            //
+            template <typename T>
+            logger& operator<<(T const &value) {
+
+    #ifdef CROW_ENABLE_LOGGING
+                if(level_ >= get_current_log_level()) {
+                    stringstream_ << value;
+                }
+    #endif
+                return *this;
+            }
+
+            //
+            static void setLogLevel(LogLevel level) {
+                get_log_level_ref() = level;
+            }
+
+            static void setHandler(ILogHandler* handler) {
+                get_handler_ref() = handler;
+            }
+
+            static LogLevel get_current_log_level() {
+                return get_log_level_ref();
+            }
+
+        private:
+            //
+            static LogLevel& get_log_level_ref()
+            {
+                static LogLevel current_level = (LogLevel)CROW_LOG_LEVEL;
+                return current_level;
+            }
+            static ILogHandler*& get_handler_ref()
+            {
+                static CerrLogHandler default_handler;
+                static ILogHandler* current_handler = &default_handler;
+                return current_handler;
+            }
+
+            //
+            std::ostringstream stringstream_;
+            LogLevel level_;
+    };
+}
+
+#define CROW_LOG_CRITICAL   \
+        if (crow::logger::get_current_log_level() <= crow::LogLevel::Critical) \
+            crow::logger("CRITICAL", crow::LogLevel::Critical)
+#define CROW_LOG_ERROR      \
+        if (crow::logger::get_current_log_level() <= crow::LogLevel::Error) \
+            crow::logger("ERROR   ", crow::LogLevel::Error)
+#define CROW_LOG_WARNING    \
+        if (crow::logger::get_current_log_level() <= crow::LogLevel::Warning) \
+            crow::logger("WARNING ", crow::LogLevel::Warning)
+#define CROW_LOG_INFO       \
+        if (crow::logger::get_current_log_level() <= crow::LogLevel::Info) \
+            crow::logger("INFO    ", crow::LogLevel::Info)
+#define CROW_LOG_DEBUG      \
+        if (crow::logger::get_current_log_level() <= crow::LogLevel::Debug) \
+            crow::logger("DEBUG   ", crow::LogLevel::Debug)
+