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@ -1,95 +1,403 @@
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#include <iostream>
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#include <thread>
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//
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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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#include <cstring>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <unistd.h>
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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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void mdc_example();
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#include "spdlog/spdlog.h"
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#include "spdlog/sinks/tcp_sink.h"
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// Server that listens for a single connection, processes one message, then exits.
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void tcp_server_single(int port) {
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int server_fd = ::socket(AF_INET, SOCK_STREAM, 0);
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if (server_fd < 0) {
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perror("socket");
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return;
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}
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int opt = 1;
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if (::setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) {
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perror("setsockopt");
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::close(server_fd);
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return;
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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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sockaddr_in address;
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std::memset(&address, 0, sizeof(address));
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address.sin_family = AF_INET;
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address.sin_addr.s_addr = INADDR_ANY;
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address.sin_port = htons(port);
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if (::bind(server_fd, reinterpret_cast<sockaddr *>(&address), sizeof(address)) < 0) {
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perror("bind");
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::close(server_fd);
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return;
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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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mdc_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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if (::listen(server_fd, 1) < 0) {
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perror("listen");
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::close(server_fd);
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return;
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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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std::cout << "Server listening on port " << port << std::endl;
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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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int client_fd = ::accept(server_fd, nullptr, nullptr);
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if (client_fd < 0) {
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perror("accept");
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::close(server_fd);
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return;
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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 specify the env variable name:
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// MYAPP_LEVEL=info,mylogger=trace && ./example
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// spdlog::cfg::load_env_levels("MYAPP_LEVEL");
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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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std::cout << "Server: Client connected" << std::endl;
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char buffer[1024] = {0};
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ssize_t n = ::read(client_fd, buffer, sizeof(buffer));
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if (n > 0) {
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std::cout << "Server received: " << std::string(buffer, n) << std::endl;
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} else if (n < 0) {
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perror("read");
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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;
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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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::close(client_fd);
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::close(server_fd);
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std::cout << "Server: Connection closed, server exiting" << std::endl;
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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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int main() {
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const int port = 12345;
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#else
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void vector_example() {}
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#endif
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// Start a server that will accept one connection and then exit.
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std::thread server_thread(tcp_server_single, port);
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std::this_thread::sleep_for(std::chrono::seconds(1)); // give server time to start
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// ! DSPDLOG_USE_STD_FORMAT
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// Create a logger that connects to the server with a 5-second timeout.
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spdlog::sinks::tcp_sink_config config("10.255.255.1", port, 5);
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auto tcpSink = std::make_shared<spdlog::sinks::tcp_sink_mt>(config);
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auto logger = std::make_shared<spdlog::logger>("TCP Logger", tcpSink);
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logger->set_level(spdlog::level::err);
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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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// First log: should connect successfully and send the message.
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try {
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logger->error("First message: connection established");
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} catch (const spdlog::spdlog_ex &ex) {
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std::cerr << "Exception during first log: " << ex.what() << std::endl;
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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) const -> 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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server_thread.join(); // server is now down
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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 std::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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std::cout << "Server is down. Now attempting to reconnect..." << std::endl;
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void user_defined_example() { spdlog::info("user defined type: {}", my_type(14)); }
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// Second log: since the connection is no longer valid, a reconnect is attempted.
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// Because there is no server, the connect() will eventually time out and throw.
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try {
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logger->error("Second message: expecting timeout error");
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} catch (const spdlog::spdlog_ex &ex) {
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std::cerr << "Timeout error caught: " << ex.what() << std::endl;
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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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|
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|
spdlog::memory_buf_t &dest) override {
|
|
|
|
|
std::string some_txt = "custom-flag";
|
|
|
|
|
dest.append(some_txt.data(), some_txt.data() + some_txt.size());
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|
|
}
|
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|
|
return 0;
|
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|
|
|
std::unique_ptr<custom_flag_formatter> clone() const override {
|
|
|
|
|
return spdlog::details::make_unique<my_formatter_flag>();
|
|
|
|
|
}
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
void custom_flags_example() {
|
|
|
|
|
using spdlog::details::make_unique; // for pre c++14
|
|
|
|
|
auto formatter = make_unique<spdlog::pattern_formatter>();
|
|
|
|
|
formatter->add_flag<my_formatter_flag>('*').set_pattern("[%n] [%*] [%^%l%$] %v");
|
|
|
|
|
// set the new formatter using spdlog::set_formatter(formatter) or
|
|
|
|
|
// logger->set_formatter(formatter) spdlog::set_formatter(std::move(formatter));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void file_events_example() {
|
|
|
|
|
// pass the spdlog::file_event_handlers to file sinks for open/close log file notifications
|
|
|
|
|
spdlog::file_event_handlers handlers;
|
|
|
|
|
handlers.before_open = [](spdlog::filename_t filename) {
|
|
|
|
|
spdlog::info("Before opening {}", filename);
|
|
|
|
|
};
|
|
|
|
|
handlers.after_open = [](spdlog::filename_t filename, std::FILE *fstream) {
|
|
|
|
|
spdlog::info("After opening {}", filename);
|
|
|
|
|
fputs("After opening\n", fstream);
|
|
|
|
|
};
|
|
|
|
|
handlers.before_close = [](spdlog::filename_t filename, std::FILE *fstream) {
|
|
|
|
|
spdlog::info("Before closing {}", filename);
|
|
|
|
|
fputs("Before closing\n", fstream);
|
|
|
|
|
};
|
|
|
|
|
handlers.after_close = [](spdlog::filename_t filename) {
|
|
|
|
|
spdlog::info("After closing {}", filename);
|
|
|
|
|
};
|
|
|
|
|
auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/events-sample.txt",
|
|
|
|
|
true, handlers);
|
|
|
|
|
spdlog::logger my_logger("some_logger", file_sink);
|
|
|
|
|
my_logger.info("Some log line");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void replace_default_logger_example() {
|
|
|
|
|
// store the old logger so we don't break other examples.
|
|
|
|
|
auto old_logger = spdlog::default_logger();
|
|
|
|
|
|
|
|
|
|
auto new_logger =
|
|
|
|
|
spdlog::basic_logger_mt("new_default_logger", "logs/new-default-log.txt", true);
|
|
|
|
|
spdlog::set_default_logger(new_logger);
|
|
|
|
|
spdlog::set_level(spdlog::level::info);
|
|
|
|
|
spdlog::debug("This message should not be displayed!");
|
|
|
|
|
spdlog::set_level(spdlog::level::trace);
|
|
|
|
|
spdlog::debug("This message should be displayed..");
|
|
|
|
|
|
|
|
|
|
spdlog::set_default_logger(old_logger);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Mapped Diagnostic Context (MDC) is a map that stores key-value pairs (string values) in thread
|
|
|
|
|
// local storage. Each thread maintains its own MDC, which loggers use to append diagnostic
|
|
|
|
|
// information to log outputs. Note: it is not supported in asynchronous mode due to its reliance on
|
|
|
|
|
// thread-local storage.
|
|
|
|
|
|
|
|
|
|
#ifndef SPDLOG_NO_TLS
|
|
|
|
|
#include "spdlog/mdc.h"
|
|
|
|
|
void mdc_example() {
|
|
|
|
|
spdlog::mdc::put("key1", "value1");
|
|
|
|
|
spdlog::mdc::put("key2", "value2");
|
|
|
|
|
// if not using the default format, you can use the %& formatter to print mdc data as well
|
|
|
|
|
spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [%&] %v");
|
|
|
|
|
spdlog::info("Some log message with context");
|
|
|
|
|
}
|
|
|
|
|
#else
|
|
|
|
|
void mdc_example() {
|
|
|
|
|
// if TLS feature is disabled
|
|
|
|
|
}
|
|
|
|
|
#endif
|
LowLevelLore
6 months ago