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@@ -0,0 +1,433 @@
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+# spdlog
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+
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+Very fast, header-only/compiled, C++ logging library. [](https://travis-ci.org/gabime/spdlog) [](https://ci.appveyor.com/project/gabime/spdlog) [](https://github.com/gabime/spdlog/releases/latest)
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+
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+## Install
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+#### Header only version
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+Copy the source [folder](https://github.com/gabime/spdlog/tree/v1.x/include/spdlog) to your build tree and use a C++11 compiler.
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+
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+#### Static lib version (recommended - much faster compile times)
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+```console
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+$ git clone https://github.com/gabime/spdlog.git
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+$ cd spdlog && mkdir build && cd build
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+$ cmake .. && make -j
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+```
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+
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+ see example [CMakeLists.txt](https://github.com/gabime/spdlog/blob/v1.x/example/CMakeLists.txt) on how to use.
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+
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+## Platforms
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+ * Linux, FreeBSD, OpenBSD, Solaris, AIX
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+ * Windows (msvc 2013+, cygwin)
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+ * macOS (clang 3.5+)
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+ * Android
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+
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+## Package managers:
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+* Homebrew: `brew install spdlog`
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+* MacPorts: `sudo port install spdlog`
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+* FreeBSD: `cd /usr/ports/devel/spdlog/ && make install clean`
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+* Fedora: `dnf install spdlog`
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+* Gentoo: `emerge dev-libs/spdlog`
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+* Arch Linux: `pacman -S spdlog`
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+* vcpkg: `vcpkg install spdlog`
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+* conan: `spdlog/[>=1.4.1]`
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+* conda: `conda install -c conda-forge spdlog`
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+
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+
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+## Features
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+* Very fast (see [benchmarks](#benchmarks) below).
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+* Headers only or compiled
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+* Feature rich formatting, using the excellent [fmt](https://github.com/fmtlib/fmt) library.
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+* Asynchronous mode (optional)
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+* [Custom](https://github.com/gabime/spdlog/wiki/3.-Custom-formatting) formatting.
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+* Multi/Single threaded loggers.
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+* Various log targets:
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+ * Rotating log files.
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+ * Daily log files.
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+ * Console logging (colors supported).
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+ * syslog.
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+ * Windows debugger (```OutputDebugString(..)```)
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+ * Easily extendable with custom log targets (just implement a single function in the [sink](include/spdlog/sinks/sink.h) interface).
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+* Log filtering - log levels can be modified in runtime as well as in compile time.
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+* Support for loading log levels from argv or from environment var.
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+* [Backtrace](#backtrace-support) support - store debug messages in a ring buffer and display later on demand.
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+
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+## Usage samples
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+
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+#### Basic usage
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+```c++
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+#include "spdlog/spdlog.h"
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+
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+int main()
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+{
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+ spdlog::info("Welcome to spdlog!");
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+ spdlog::error("Some error message with arg: {}", 1);
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+
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+ spdlog::warn("Easy padding in numbers like {:08d}", 12);
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+ spdlog::critical("Support for int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}", 42);
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+ spdlog::info("Support for floats {:03.2f}", 1.23456);
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+ spdlog::info("Positional args are {1} {0}..", "too", "supported");
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+ spdlog::info("{:<30}", "left aligned");
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+
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+ spdlog::set_level(spdlog::level::debug); // Set global log level to debug
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+ spdlog::debug("This message should be displayed..");
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+
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+ // change log pattern
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+ spdlog::set_pattern("[%H:%M:%S %z] [%n] [%^---%L---%$] [thread %t] %v");
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+
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+ // Compile time log levels
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+ // define SPDLOG_ACTIVE_LEVEL to desired level
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+ SPDLOG_TRACE("Some trace message with param {}", 42);
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+ SPDLOG_DEBUG("Some debug message");
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+}
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+
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+```
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+---
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+#### Create stdout/stderr logger object
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+```c++
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+#include "spdlog/spdlog.h"
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+#include "spdlog/sinks/stdout_color_sinks.h"
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+void stdout_example()
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+{
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+ // create color multi threaded logger
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+ auto console = spdlog::stdout_color_mt("console");
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+ auto err_logger = spdlog::stderr_color_mt("stderr");
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+ spdlog::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name)");
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+}
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+```
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+
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+---
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+#### Basic file logger
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+```c++
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+#include "spdlog/sinks/basic_file_sink.h"
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+void basic_logfile_example()
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+{
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+ try
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+ {
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+ auto logger = spdlog::basic_logger_mt("basic_logger", "logs/basic-log.txt");
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+ }
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+ catch (const spdlog::spdlog_ex &ex)
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+ {
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+ std::cout << "Log init failed: " << ex.what() << std::endl;
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+ }
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+}
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+```
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+---
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+#### Rotating files
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+```c++
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+#include "spdlog/sinks/rotating_file_sink.h"
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+void rotating_example()
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+{
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+ // Create a file rotating logger with 5mb size max and 3 rotated files
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+ auto max_size = 1048576 * 5;
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+ auto max_files = 3;
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+ auto logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", max_size, max_files);
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+}
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+```
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+
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+---
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+#### Daily files
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+```c++
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+
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+#include "spdlog/sinks/daily_file_sink.h"
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+void daily_example()
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+{
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+ // Create a daily logger - a new file is created every day on 2:30am
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+ auto logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
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+}
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+
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+```
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+
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+---
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+#### Backtrace support
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+```c++
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+// Loggers can store in a ring buffer all messages (including debug/trace) and display later on demand.
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+// When needed, call dump_backtrace() to see them
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+
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+spdlog::enable_backtrace(32); // Store the latest 32 messages in a buffer. Older messages will be dropped.
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+// or my_logger->enable_backtrace(32)..
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+for(int i = 0; i < 100; i++)
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+{
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+ spdlog::debug("Backtrace message {}", i); // not logged yet..
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+}
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+// e.g. if some error happened:
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+spdlog::dump_backtrace(); // log them now! show the last 32 messages
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+
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+// or my_logger->dump_backtrace(32)..
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+```
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+
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+---
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+#### Periodic flush
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+```c++
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+// periodically flush all *registered* loggers every 3 seconds:
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+// warning: only use if all your loggers are thread safe ("_mt" loggers)
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+spdlog::flush_every(std::chrono::seconds(3));
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+
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+```
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+
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+---
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+#### Stopwatch
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+```c++
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+// Stopwatch support for spdlog
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+#include "spdlog/stopwatch.h"
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+void stopwatch_example()
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+{
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+ spdlog::stopwatch sw;
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+ spdlog::debug("Elapsed {}", sw);
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+ spdlog::debug("Elapsed {:.3}", sw);
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+}
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+
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+```
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+
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+---
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+#### Log binary data in hex
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+```c++
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+// many types of std::container<char> types can be used.
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+// ranges are supported too.
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+// format flags:
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+// {:X} - print in uppercase.
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+// {:s} - don't separate each byte with space.
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+// {:p} - don't print the position on each line start.
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+// {:n} - don't split the output to lines.
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+// {:a} - show ASCII if :n is not set.
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+
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+#include "spdlog/fmt/bin_to_hex.h"
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+
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+void binary_example()
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+{
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+ auto console = spdlog::get("console");
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+ std::array<char, 80> buf;
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+ console->info("Binary example: {}", spdlog::to_hex(buf));
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+ console->info("Another binary example:{:n}", spdlog::to_hex(std::begin(buf), std::begin(buf) + 10));
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+ // more examples:
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+ // logger->info("uppercase: {:X}", spdlog::to_hex(buf));
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+ // logger->info("uppercase, no delimiters: {:Xs}", spdlog::to_hex(buf));
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+ // logger->info("uppercase, no delimiters, no position info: {:Xsp}", spdlog::to_hex(buf));
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+}
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+
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+```
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+
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+---
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+#### Logger with multi sinks - each with different format and log level
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+```c++
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+
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+// create logger with 2 targets with different log levels and formats.
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+// 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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+{
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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);
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+ console_sink->set_pattern("[multi_sink_example] [%^%l%$] %v");
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+
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+ auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", true);
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+ file_sink->set_level(spdlog::level::trace);
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+
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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");
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+ logger.info("this message should not appear in the console, only in the file");
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+}
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+```
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+
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+---
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+#### Asynchronous logging
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+```c++
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+#include "spdlog/async.h"
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+#include "spdlog/sinks/basic_file_sink.h"
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+void async_example()
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+{
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+ // default thread pool settings can be modified *before* creating the async logger:
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+ // spdlog::init_thread_pool(8192, 1); // queue with 8k items and 1 backing thread.
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+ auto async_file = spdlog::basic_logger_mt<spdlog::async_factory>("async_file_logger", "logs/async_log.txt");
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+ // 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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+}
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+
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+```
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+
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+---
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+#### Asynchronous logger with multi sinks
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+```c++
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+#include "spdlog/sinks/stdout_color_sinks.h"
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+#include "spdlog/sinks/rotating_file_sink.h"
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+
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+void multi_sink_example2()
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+{
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+ spdlog::init_thread_pool(8192, 1);
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+ auto stdout_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt >();
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+ auto rotating_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt>("mylog.txt", 1024*1024*10, 3);
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+ std::vector<spdlog::sink_ptr> sinks {stdout_sink, rotating_sink};
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+ auto logger = std::make_shared<spdlog::async_logger>("loggername", sinks.begin(), sinks.end(), spdlog::thread_pool(), spdlog::async_overflow_policy::block);
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+ spdlog::register_logger(logger);
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+}
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+```
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+
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+---
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+#### User defined types
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+```c++
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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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+{
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+ int i;
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+ template<typename OStream>
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+ friend OStream &operator<<(OStream &os, const my_type &c)
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+ {
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+ return os << "[my_type i=" << c.i << "]";
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+ }
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+};
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+
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+void user_defined_example()
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+{
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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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+```
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+
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+---
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+#### User defined flags in the log pattern
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+```c++
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+// Log patterns can contain custom flags.
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+// the following example will add new flag '%*' - which will be bound to a <my_formatter_flag> instance.
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+#include "spdlog/pattern_formatter.h"
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+class my_formatter_flag : public spdlog::custom_flag_formatter
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+{
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+public:
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+ void format(const spdlog::details::log_msg &, const std::tm &, spdlog::memory_buf_t &dest) override
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+ {
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+ std::string some_txt = "custom-flag";
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+ dest.append(some_txt.data(), some_txt.data() + some_txt.size());
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+ }
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+
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+ std::unique_ptr<custom_flag_formatter> clone() const override
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+ {
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+ return spdlog::details::make_unique<my_formatter_flag>();
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+ }
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+};
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+
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+void custom_flags_example()
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+{
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+ auto formatter = std::make_unique<spdlog::pattern_formatter>();
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+ formatter->add_flag<my_formatter_flag>('*').set_pattern("[%n] [%*] [%^%l%$] %v");
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+ spdlog::set_formatter(std::move(formatter));
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+}
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+
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+```
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+
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+---
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+#### Custom error handler
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+```c++
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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(..))
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+ spdlog::set_error_handler([](const std::string &msg) { spdlog::get("console")->error("*** LOGGER ERROR ***: {}", msg); });
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+ spdlog::get("console")->info("some invalid message to trigger an error {}{}{}{}", 3);
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+}
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+
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+```
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+
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+---
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+#### syslog
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+```c++
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+#include "spdlog/sinks/syslog_sink.h"
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+void syslog_example()
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+{
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+ std::string ident = "spdlog-example";
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+ auto syslog_logger = spdlog::syslog_logger_mt("syslog", ident, LOG_PID);
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+ syslog_logger->warn("This is warning that will end up in syslog.");
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+}
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+```
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+---
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+#### Android example
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+```c++
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+#include "spdlog/sinks/android_sink.h"
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+void android_example()
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+{
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+ std::string tag = "spdlog-android";
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+ auto android_logger = spdlog::android_logger_mt("android", tag);
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+ android_logger->critical("Use \"adb shell logcat\" to view this message.");
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+}
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+```
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+
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+---
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+#### Load log levels from env variable or from argv
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+
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+```c++
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+#include "spdlog/cfg/env.h"
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+int main (int argc, char *argv[])
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+{
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+ spdlog::cfg::load_env_levels();
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+ // or from command line:
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+ // ./example SPDLOG_LEVEL=info,mylogger=trace
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+ // #include "spdlog/cfg/argv.h" // for loading levels from argv
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+ // spdlog::cfg::load_argv_levels(argc, argv);
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+}
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+```
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+So then you can:
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+
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+```console
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+$ export SPDLOG_LEVEL=info,mylogger=trace
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+$ ./example
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+```
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+
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+---
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+## Benchmarks
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+
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+Below are some [benchmarks](https://github.com/gabime/spdlog/blob/v1.x/bench/bench.cpp) done in Ubuntu 64 bit, Intel i7-4770 CPU @ 3.40GHz
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+
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+#### Synchronous mode
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+```
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+[info] **************************************************************
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+[info] Single thread, 1,000,000 iterations
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+[info] **************************************************************
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+[info] basic_st Elapsed: 0.17 secs 5,777,626/sec
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+[info] rotating_st Elapsed: 0.18 secs 5,475,894/sec
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+[info] daily_st Elapsed: 0.20 secs 5,062,659/sec
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+[info] empty_logger Elapsed: 0.07 secs 14,127,300/sec
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+[info] **************************************************************
|
|
|
+[info] C-string (400 bytes). Single thread, 1,000,000 iterations
|
|
|
+[info] **************************************************************
|
|
|
+[info] basic_st Elapsed: 0.41 secs 2,412,483/sec
|
|
|
+[info] rotating_st Elapsed: 0.72 secs 1,389,196/sec
|
|
|
+[info] daily_st Elapsed: 0.42 secs 2,393,298/sec
|
|
|
+[info] null_st Elapsed: 0.04 secs 27,446,957/sec
|
|
|
+[info] **************************************************************
|
|
|
+[info] 10 threads, competing over the same logger object, 1,000,000 iterations
|
|
|
+[info] **************************************************************
|
|
|
+[info] basic_mt Elapsed: 0.60 secs 1,659,613/sec
|
|
|
+[info] rotating_mt Elapsed: 0.62 secs 1,612,493/sec
|
|
|
+[info] daily_mt Elapsed: 0.61 secs 1,638,305/sec
|
|
|
+[info] null_mt Elapsed: 0.16 secs 6,272,758/sec
|
|
|
+```
|
|
|
+#### Asynchronous mode
|
|
|
+```
|
|
|
+[info] -------------------------------------------------
|
|
|
+[info] Messages : 1,000,000
|
|
|
+[info] Threads : 10
|
|
|
+[info] Queue : 8,192 slots
|
|
|
+[info] Queue memory : 8,192 x 272 = 2,176 KB
|
|
|
+[info] -------------------------------------------------
|
|
|
+[info]
|
|
|
+[info] *********************************
|
|
|
+[info] Queue Overflow Policy: block
|
|
|
+[info] *********************************
|
|
|
+[info] Elapsed: 1.70784 secs 585,535/sec
|
|
|
+[info] Elapsed: 1.69805 secs 588,910/sec
|
|
|
+[info] Elapsed: 1.7026 secs 587,337/sec
|
|
|
+[info]
|
|
|
+[info] *********************************
|
|
|
+[info] Queue Overflow Policy: overrun
|
|
|
+[info] *********************************
|
|
|
+[info] Elapsed: 0.372816 secs 2,682,285/sec
|
|
|
+[info] Elapsed: 0.379758 secs 2,633,255/sec
|
|
|
+[info] Elapsed: 0.373532 secs 2,677,147/sec
|
|
|
+
|
|
|
+```
|
|
|
+
|
|
|
+## Documentation
|
|
|
+Documentation can be found in the [wiki](https://github.com/gabime/spdlog/wiki/1.-QuickStart) pages.
|
|
|
+
|
|
|
+---
|
|
|
+
|
|
|
+Thanks to [JetBrains](https://www.jetbrains.com/?from=spdlog) for donating product licenses to help develop **spdlog** <a href="https://www.jetbrains.com/?from=spdlog"><img src="logos/jetbrains-variant-4.svg" width="94" align="center" /></a>
|
|
|
+
|
|
|
+
|
Jeremy Borgman