spdlog/example/example.cpp

/*************************************************************************/
/* spdlog - an extremely fast and easy to use c++11 logging library.     */
/* Copyright (c) 2014 Gabi Melman.                                       */
/*                                                                       */
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/* the following conditions:                                             */
/*                                                                       */
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/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
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/*************************************************************************/

//
// spdlog usage example
//
#include <iostream>
#include "spdlog/spdlog.h"


int main(int, char* [])
{

    namespace spd = spdlog;

    try
    {
        std::string filename = "logs/spdlog_example";
        // Set log level to all loggers to DEBUG and above
        spd::set_level(spd::level::DEBUG);

        //Create console, multithreaded logger
        auto console = spd::stdout_logger_mt("console");
        console->info("Welcome to spdlog!") ;
        console->info("An info message example {}..", 1);
        console->info() << "Streams are supported too  " << 1;

        console->info("Easy padding in numbers like {:08d}", 12);
        console->info("Support for int: {0:d};  hex: {0:08x};  oct: {0:o}; bin: {0:b}", 42);
        console->info("Support for floats {:03.2f}", 1.23456);
        console->info("Positional args are {1} {0}..", "too", "supported");

        console->info("{:<30}", "left aligned");
        console->info("{:>30}", "right aligned");
        console->info("{:^30}", "centered");

        //Create a file rotating logger with 5mb size max and 3 rotated files
        auto file_logger = spd::rotating_logger_mt("file_logger", filename, 1024 * 1024 * 5, 3);

        file_logger->info("Log file message number", 1);
        for(int i = 0; i < 10; ++i)
            file_logger->info("{} * {} equals {:>10}", i, i, i*i);

        spd::set_pattern("*** [%H:%M:%S %z] [thread %t] %v ***");
        file_logger->info("This is another message with custom format");

        spd::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name) function");

		// Debug and trace macros to be turned on/off at compile time.
		// Evaluates to empty statements if not turned on
		// Define SPDLOG_DEBUG_ON or SPDLOG_TRACE_ON - before including spdlog.h
        SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23);
        SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23);
        

#ifdef __linux__		
		// syslog example
		std::string ident = "spdlog_example"; // empty ident can be used to use current program name
        auto syslog_logger = spd::syslog_logger("syslog", ident, LOG_PID);
        syslog_logger->set_pattern("[%l] %v"); //syslog already put timestamps so set the pattern to minimum (log level and the message)
        syslog_logger->warn("This message that will end up in syslog. This is Linux only..");
#endif
        
        // Asynchronous logging is easy..
        // Just call spdlog::set_async_mode(q_size) and all created loggers from now on will be asynchronous..
        // Note: queue size must be power of 2!                
        size_t q_size = 1048576;
        spdlog::set_async_mode(q_size);
        auto async_file= spd::daily_logger_st("async_file_logger", "logs/async_log.txt");
        for(int i = 0; i < 100; i++)
	        async_file->info("This is async log message #{}.. Should be very fast.. ", i);
    
    }
    catch (const spd::spdlog_ex& ex)
    {
        std::cout << "Log failed: " << ex.what() << std::endl;
    }
    return 0;
}