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379 lines
13 KiB
C++
379 lines
13 KiB
C++
//
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// Copyright(c) 2015 Gabi Melman.
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// Distributed under the MIT License (http://opensource.org/licenses/MIT)
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// spdlog usage example
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#include <cstdio>
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#include <chrono>
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void load_levels_example();
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void stdout_logger_example();
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void basic_example();
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void rotating_example();
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void daily_example();
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void callback_example();
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void async_example();
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void binary_example();
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void vector_example();
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void stopwatch_example();
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void trace_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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void udp_example();
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void custom_flags_example();
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void file_events_example();
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void replace_default_logger_example();
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#include "spdlog/spdlog.h"
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#include "spdlog/cfg/env.h" // support for loading levels from the environment variable
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#include "spdlog/fmt/ostr.h" // support for user defined types
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int main(int, char *[]) {
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// Log levels can be loaded from argv/env using "SPDLOG_LEVEL"
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load_levels_example();
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spdlog::info("Welcome to spdlog version {}.{}.{} !", SPDLOG_VER_MAJOR, SPDLOG_VER_MINOR,
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SPDLOG_VER_PATCH);
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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("{:>8} aligned, {:<8} aligned", "right", "left");
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// Runtime log levels
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spdlog::set_level(spdlog::level::info); // Set global log level to info
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spdlog::debug("This message should not be displayed!");
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spdlog::set_level(spdlog::level::trace); // Set specific logger's log level
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spdlog::debug("This message should be displayed..");
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// Customize msg format for all loggers
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spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [thread %t] %v");
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spdlog::info("This an info message with custom format");
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spdlog::set_pattern("%+"); // back to default format
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spdlog::set_level(spdlog::level::info);
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// Backtrace support
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// Loggers can store in a ring buffer all messages (including debug/trace) for later inspection.
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// When needed, call dump_backtrace() to see what happened:
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spdlog::enable_backtrace(10); // create ring buffer with capacity of 10 messages
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for (int i = 0; i < 100; i++) {
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spdlog::debug("Backtrace message {}", i); // not logged..
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}
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// e.g. if some error happened:
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spdlog::dump_backtrace(); // log them now!
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try {
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stdout_logger_example();
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basic_example();
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rotating_example();
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daily_example();
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callback_example();
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async_example();
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binary_example();
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vector_example();
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multi_sink_example();
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user_defined_example();
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err_handler_example();
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trace_example();
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stopwatch_example();
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udp_example();
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custom_flags_example();
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file_events_example();
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replace_default_logger_example();
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// Flush all *registered* loggers using a worker thread every 3 seconds.
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// note: registered loggers *must* be thread safe for this to work correctly!
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spdlog::flush_every(std::chrono::seconds(3));
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// Apply some function on all registered loggers
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spdlog::apply_all([&](std::shared_ptr<spdlog::logger> l) { l->info("End of example."); });
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// Release all spdlog resources, and drop all loggers in the registry.
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// This is optional (only mandatory if using windows + async log).
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spdlog::shutdown();
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}
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// 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::printf("Log initialization failed: %s\n", ex.what());
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return 1;
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}
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}
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#include "spdlog/sinks/stdout_color_sinks.h"
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// or #include "spdlog/sinks/stdout_sinks.h" if no colors needed.
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void stdout_logger_example() {
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// Create color multi threaded logger.
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auto console = spdlog::stdout_color_mt("console");
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// or for stderr:
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// auto console = spdlog::stderr_color_mt("error-logger");
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}
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#include "spdlog/sinks/basic_file_sink.h"
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void basic_example() {
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// Create basic file logger (not rotated).
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auto my_logger = spdlog::basic_logger_mt("file_logger", "logs/basic-log.txt", true);
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}
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#include "spdlog/sinks/rotating_file_sink.h"
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void rotating_example() {
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// Create a file rotating logger with 5mb size max and 3 rotated files.
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auto rotating_logger =
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spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
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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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// 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/sinks/callback_sink.h"
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void callback_example() {
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// Create the logger
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auto logger = spdlog::callback_logger_mt("custom_callback_logger",
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[](const spdlog::details::log_msg & /*msg*/) {
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// do what you need to do with msg
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});
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}
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#include "spdlog/cfg/env.h"
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void load_levels_example() {
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// Set the log level to "info" and mylogger to "trace":
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// SPDLOG_LEVEL=info,mylogger=trace && ./example
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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(args, argv);
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}
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#include "spdlog/async.h"
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void async_example() {
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// Default thread pool settings can be modified *before* creating the async logger:
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// spdlog::init_thread_pool(32768, 1); // queue with max 32k items 1 backing thread.
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auto async_file =
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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 =
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// spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("async_file_logger",
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// "logs/async_log.txt");
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for (int i = 1; i < 101; ++i) {
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async_file->info("Async message #{}", i);
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}
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}
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// Log binary data as hex.
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// Many types of std::container<char> types can be used.
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// Iterator 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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#if !defined SPDLOG_USE_STD_FORMAT || defined(_MSC_VER)
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#include "spdlog/fmt/bin_to_hex.h"
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void binary_example() {
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std::vector<char> buf(80);
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for (int i = 0; i < 80; i++) {
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buf.push_back(static_cast<char>(i & 0xff));
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}
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spdlog::info("Binary example: {}", spdlog::to_hex(buf));
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spdlog::info("Another binary example:{:n}",
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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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// logger->info("hexdump style: {:a}", spdlog::to_hex(buf));
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// logger->info("hexdump style, 20 chars per line {:a}", spdlog::to_hex(buf, 20));
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}
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#else
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void binary_example() {
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// not supported with std::format yet
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}
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#endif
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// Log a vector of numbers
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#ifndef SPDLOG_USE_STD_FORMAT
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#include "spdlog/fmt/ranges.h"
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void vector_example() {
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std::vector<int> vec = {1, 2, 3};
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spdlog::info("Vector example: {}", vec);
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}
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#else
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void vector_example() {}
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#endif
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// ! DSPDLOG_USE_STD_FORMAT
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// Compile time log levels.
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// define SPDLOG_ACTIVE_LEVEL to required level (e.g. SPDLOG_LEVEL_TRACE)
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void trace_example() {
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// trace from default logger
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SPDLOG_TRACE("Some trace message.. {} ,{}", 1, 3.23);
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// debug from default logger
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SPDLOG_DEBUG("Some debug message.. {} ,{}", 1, 3.23);
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// trace from logger object
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auto logger = spdlog::get("file_logger");
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SPDLOG_LOGGER_TRACE(logger, "another trace message");
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}
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// stopwatch example
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#include "spdlog/stopwatch.h"
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#include <thread>
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void stopwatch_example() {
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spdlog::stopwatch sw;
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std::this_thread::sleep_for(std::chrono::milliseconds(123));
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spdlog::info("Stopwatch: {} seconds", sw);
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}
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#include "spdlog/sinks/udp_sink.h"
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void udp_example() {
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spdlog::sinks::udp_sink_config cfg("127.0.0.1", 11091);
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auto my_logger = spdlog::udp_logger_mt("udplog", cfg);
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my_logger->set_level(spdlog::level::debug);
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my_logger->info("hello world");
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}
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// A logger with multiple sinks (stdout and file) - each with a different format and log level.
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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);
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console_sink->set_pattern("[multi_sink_example] [%^%l%$] %v");
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auto file_sink =
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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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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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// User defined types logging
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struct my_type {
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int i = 0;
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explicit my_type(int i)
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: i(i){};
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};
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#ifndef SPDLOG_USE_STD_FORMAT // when using fmtlib
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template <>
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struct fmt::formatter<my_type> : fmt::formatter<std::string> {
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auto format(my_type my, format_context &ctx) -> decltype(ctx.out()) {
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return fmt::format_to(ctx.out(), "[my_type i={}]", my.i);
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}
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};
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#else // when using std::format
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template <>
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struct std::formatter<my_type> : std::formatter<std::string> {
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auto format(my_type my, format_context &ctx) const -> decltype(ctx.out()) {
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return format_to(ctx.out(), "[my_type i={}]", my.i);
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}
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};
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#endif
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void user_defined_example() { spdlog::info("user defined type: {}", my_type(14)); }
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// Custom error handler. Will be triggered on log failure.
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void err_handler_example() {
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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) {
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printf("*** Custom log error handler: %s ***\n", msg.c_str());
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});
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}
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// syslog example (linux/osx/freebsd)
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#ifndef _WIN32
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#include "spdlog/sinks/syslog_sink.h"
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void syslog_example() {
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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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#endif
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// Android example.
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#if defined(__ANDROID__)
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#include "spdlog/sinks/android_sink.h"
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void android_example() {
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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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#endif
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// Log patterns can contain custom flags.
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// this will add custom 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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public:
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void format(const spdlog::details::log_msg &,
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const std::tm &,
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spdlog::memory_buf_t &dest) override {
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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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std::unique_ptr<custom_flag_formatter> clone() const override {
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return spdlog::details::make_unique<my_formatter_flag>();
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}
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};
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void custom_flags_example() {
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using spdlog::details::make_unique; // for pre c++14
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auto formatter = make_unique<spdlog::pattern_formatter>();
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formatter->add_flag<my_formatter_flag>('*').set_pattern("[%n] [%*] [%^%l%$] %v");
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// set the new formatter using spdlog::set_formatter(formatter) or
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// logger->set_formatter(formatter) spdlog::set_formatter(std::move(formatter));
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}
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void file_events_example() {
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// pass the spdlog::file_event_handlers to file sinks for open/close log file notifications
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spdlog::file_event_handlers handlers;
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handlers.before_open = [](spdlog::filename_t filename) {
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spdlog::info("Before opening {}", filename);
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};
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handlers.after_open = [](spdlog::filename_t filename, std::FILE *fstream) {
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spdlog::info("After opening {}", filename);
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fputs("After opening\n", fstream);
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};
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handlers.before_close = [](spdlog::filename_t filename, std::FILE *fstream) {
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spdlog::info("Before closing {}", filename);
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fputs("Before closing\n", fstream);
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};
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handlers.after_close = [](spdlog::filename_t filename) {
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spdlog::info("After closing {}", filename);
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};
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auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/events-sample.txt",
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true, handlers);
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spdlog::logger my_logger("some_logger", file_sink);
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my_logger.info("Some log line");
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}
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void replace_default_logger_example() {
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// store the old logger so we don't break other examples.
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auto old_logger = spdlog::default_logger();
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auto new_logger =
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spdlog::basic_logger_mt("new_default_logger", "logs/new-default-log.txt", true);
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spdlog::set_default_logger(new_logger);
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spdlog::set_level(spdlog::level::info);
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spdlog::debug("This message should not be displayed!");
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spdlog::set_level(spdlog::level::trace);
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spdlog::debug("This message should be displayed..");
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spdlog::set_default_logger(old_logger);
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}
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