spdlog/example/example.cpp

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//
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// Copyright(c) 2015 Gabi Melman.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
//
//
// spdlog usage example
//
//
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#include <iostream>
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void stdout_example();
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void basic_example();
void rotating_example();
void daily_example();
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void async_example();
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void multi_sink_example();
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void user_defined_example();
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void err_handler_example();
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void syslog_example();
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#include "spdlog/spdlog.h"
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int main(int, char *[])
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{
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try
{
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// console logging example
stdout_example();
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// various file loggers
basic_example();
rotating_example();
daily_example();
// async logging using a backing thread pool
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async_example();
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// a logger can have multiple targets with different formats
multi_sink_example();
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// user defined types logging by implementing operator<<
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user_defined_example();
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// custom error handler
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err_handler_example();
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// apply some function on all registered loggers
spdlog::apply_all([&](std::shared_ptr<spdlog::logger> l) { l->info("End of example."); });
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// Release and close all loggers
spdlog::drop_all();
}
// Exceptions will only be thrown upon failed logger or sink construction (not during logging)
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catch (const spdlog::spdlog_ex &ex)
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{
std::cout << "Log init failed: " << ex.what() << std::endl;
return 1;
}
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}
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#include "spdlog/sinks/stdout_color_sinks.h" // or "/sinks/stdout_sinks.h" if no colors needed
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void stdout_example()
{
// create color multi threaded logger
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auto console = spdlog::stdout_color_mt("console");
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console->info("Welcome to spdlog!");
console->error("Some error message with arg: {}", 1);
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auto err_logger = spdlog::stderr_color_mt("stderr");
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err_logger->error("Some error message");
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// Formatting examples
console->warn("Easy padding in numbers like {:08d}", 12);
console->critical("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");
console->info("{:<30}", "left aligned");
spdlog::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name)");
// Runtime log levels
spdlog::set_level(spdlog::level::info); // Set global log level to info
console->debug("This message should not be displayed!");
console->set_level(spdlog::level::trace); // Set specific logger's log level
console->debug("This message should be displayed..");
// Customize msg format for all loggers
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spdlog::set_pattern("[%H:%M:%S %z] [%n] [%^---%L---%$] [thread %t] %v");
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console->info("This an info message with custom format");
// Compile time log levels
// define SPDLOG_DEBUG_ON or SPDLOG_TRACE_ON
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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#include "spdlog/sinks/basic_file_sink.h"
void basic_example()
{
// Create basic file logger (not rotated)
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auto my_logger = spdlog::basic_logger_mt("basic_logger", "logs/basic-log.txt");
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}
#include "spdlog/sinks/rotating_file_sink.h"
void rotating_example()
{
// Create a file rotating logger with 5mb size max and 3 rotated files
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auto rotating_logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
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}
#include "spdlog/sinks/daily_file_sink.h"
void daily_example()
{
// Create a daily logger - a new file is created every day on 2:30am
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auto daily_logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
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}
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#include "spdlog/async.h"
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void async_example()
{
// default thread pool settings can be modified *before* creating the async logger:
// spdlog::init_thread_pool(32768, 1); // queue with max 32k items 1 backing thread.
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auto async_file = spdlog::basic_logger_mt<spdlog::async_factory>("async_file_logger", "logs/async_log.txt");
// alternatively:
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// auto async_file = spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("async_file_logger", "logs/async_log.txt");
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for (int i = 1; i < 101; ++i)
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{
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async_file->info("Async message #{}", i);
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}
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}
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// create logger with 2 targets with different log levels and formats
// the console will show only warnings or errors, while the file will log all
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void multi_sink_example()
{
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auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
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console_sink->set_level(spdlog::level::warn);
console_sink->set_pattern("[multi_sink_example] [%^%l%$] %v");
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auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", true);
file_sink->set_level(spdlog::level::trace);
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spdlog::logger logger("multi_sink", {console_sink, file_sink});
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logger.set_level(spdlog::level::debug);
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logger.warn("this should appear in both console and file");
logger.info("this message should not appear in the console, only in the file");
}
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// user defined types logging by implementing operator<<
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#include "spdlog/fmt/ostr.h" // must be included
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struct my_type
{
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int i;
template<typename OStream>
friend OStream &operator<<(OStream &os, const my_type &c)
{
return os << "[my_type i=" << c.i << "]";
}
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};
void user_defined_example()
{
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spdlog::get("console")->info("user defined type: {}", my_type{14});
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}
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//
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// custom error handler
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//
void err_handler_example()
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{
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// can be set globally or per logger(logger->set_error_handler(..))
spdlog::set_error_handler([](const std::string &msg) { spdlog::get("console")->error("*** LOGGER ERROR ***: {}", msg); });
spdlog::get("console")->info("some invalid message to trigger an error {}{}{}{}", 3);
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}
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// syslog example (linux/osx/freebsd)
#ifndef _WIN32
#include "spdlog/sinks/syslog_sink.h"
void syslog_example()
{
std::string ident = "spdlog-example";
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auto syslog_logger = spdlog::syslog_logger("syslog", ident, LOG_PID);
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syslog_logger->warn("This is warning that will end up in syslog.");
}
#endif
// Android example
#if defined(__ANDROID__)
#incude "spdlog/sinks/android_sink.h"
void android_example()
{
std::string tag = "spdlog-android";
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auto android_logger = spdlog::android_logger("android", tag);
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android_logger->critical("Use \"adb shell logcat\" to view this message.");
}
#endif