spdlog/example/example.cpp

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//
// Copyright(c) 2015 Gabi Melman.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
//
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//
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// spdlog usage example
//
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#include "spdlog/spdlog.h"
#include <cstdlib> // EXIT_FAILURE
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#include <iostream>
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#include <memory>
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void async_example();
void syslog_example();
void color_example();
namespace spd = spdlog;
int main(int, char*[])
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{
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try
{
//Create console, multithreaded logger
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auto console = spd::stdout_logger_mt("console");
console->info("Welcome to spdlog!");
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console->info("An info message example {}..", 1);
console->info() << "Streams are supported too " << 1;
//Formatting examples
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console->info("Easy padding in numbers like {:08d}", 12);
console->info("Support for int: {0:d}; hex: {0:x}; 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");
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console->info("{:<30}", "left aligned");
console->info("{:>30}", "right aligned");
console->info("{:^30}", "centered");
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spd::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name) function");
// Runtime log levels
spd::set_level(spd::level::info); //Set global log level to info
console->debug("This message shold not be displayed!");
console->set_level(spd::level::debug); // Set specific logger's log level
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console->debug("This message shold be displayed..");
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// Create a file rotating logger with 5mb size max and 3 rotated files
auto file_logger = spd::rotating_logger_mt("file_logger", "logs/mylogfile", 1048576 * 5, 3);
for (int i = 0; i < 10; ++i)
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file_logger->info("{} * {} equals {:>10}", i, i, i*i);
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// Create a daily logger - a new file is created every day on 2:30am
auto daily_logger = spd::daily_logger_mt("daily_logger", "logs/daily", 2, 30);
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// Customize msg format for all messages
spd::set_pattern("*** [%H:%M:%S %z] [thread %t] %v ***");
file_logger->info("This is another message with custom format");
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// Compile time debug or trace macros.
// Enabled #ifdef SPDLOG_DEBUG_ON or #ifdef SPDLOG_TRACE_ON
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SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23);
SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23);
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// Asynchronous logging is very fast..
// Just call spdlog::set_async_mode(q_size) and all created loggers from now on will be asynchronous..
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async_example();
// syslog example. linux/osx only..
syslog_example();
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// terminal color example (works under linux/osx. windows: only if ansi.sys is loaded)
color_example();
// Release and close all loggers
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spdlog::drop_all();
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}
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catch (const spd::spdlog_ex& ex)
{
std::cout << "Log failed: " << ex.what() << std::endl;
return EXIT_FAILURE;
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}
return EXIT_SUCCESS;
}
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void async_example()
{
size_t q_size = 4096; //queue size must be power of 2
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("Async message #{}", i);
}
//syslog example (linux/osx only)
void syslog_example()
{
#if defined (__linux__) || defined(__APPLE__)
std::string ident = "spdlog-example";
auto syslog_logger = spd::syslog_logger("syslog", ident, LOG_PID);
syslog_logger->warn("This is warning that will end up in syslog. This is Linux only!");
#endif
}
// terminal color example (works under linux/osx. windows: only if ansi.sys is loaded)
#include "spdlog/sinks/ansicolor_sink.h"
void color_example()
{
// Create a sink to add colors to.
auto console_out = spdlog::sinks::stderr_sink_st::instance();
auto color_sink = std::make_shared<spd::sinks::ansicolor_sink>(console_out); // wraps around another sink
auto color_logger = spd::details::registry::instance().create("Color", color_sink);
color_logger->set_level(spd::level::trace);
color_sink->setColor(spd::level::info, color_sink->bold + color_sink->green);
color_logger->info("Testing color logger...");
color_logger->trace("Trace");
color_logger->debug("Debug");
color_logger->info("Info");
color_logger->notice("Notice");
color_logger->warn("Warning");
color_logger->error("Error");
color_logger->critical("Critical");
color_logger->alert("Alert");
color_logger->emerg("Emergency");
}
// Example of user defined class with operator<<
class some_class {};
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std::ostream& operator<<(std::ostream& os, const some_class&)
{
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return os << "some_class";
}
void custom_class_example()
{
some_class c;
spdlog::get("console")->info("custom class with operator<<: {}..", c);
spdlog::get("console")->info() << "custom class with operator<<: " << c << "..";
}