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Use locking fwrite_unlocked if possible

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pull/3276/head
gabime 9 months ago
parent 951c5b9987
commit ff4eb56209
8 changed files with 77 additions and 396 deletions
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13
CMakeLists.txt
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@ -238,6 +238,19 @@ if(SPDLOG_FMT_EXTERNAL OR SPDLOG_FMT_EXTERNAL_HO)
set(PKG_CONFIG_REQUIRES fmt) # add dependency to pkg-config set(PKG_CONFIG_REQUIRES fmt) # add dependency to pkg-config
endif() endif()
# ---------------------------------------------------------------------------------------
# Check if fwrite_unlocked/_fwrite_nolock is available
# ---------------------------------------------------------------------------------------
include(CheckSymbolExists)
if(WIN32)
check_symbol_exists(_fwrite_nolock "stdio.h" HAVE_FWRITE_UNLOCKED)
else ()
check_symbol_exists(fwrite_unlocked "stdio.h" HAVE_FWRITE_UNLOCKED)
endif()
if(HAVE_FWRITE_UNLOCKED)
target_compile_definitions(spdlog PRIVATE SPDLOG_FWRITE_UNLOCKED)
endif()
# --------------------------------------------------------------------------------------- # ---------------------------------------------------------------------------------------
# Add required libraries for Android CMake build # Add required libraries for Android CMake build
# --------------------------------------------------------------------------------------- # ---------------------------------------------------------------------------------------

391
example/example.cpp
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@ -7,394 +7,13 @@
#include <cstdio> #include <cstdio>
#include <chrono> #include <chrono>
void load_levels_example(); #include "spdlog/spdlite.h"
void stdout_logger_example();
void basic_example();
void rotating_example();
void daily_example();
void callback_example();
void async_example();
void binary_example();
void vector_example();
void stopwatch_example();
void trace_example();
void multi_sink_example();
void user_defined_example();
void err_handler_example();
void syslog_example();
void udp_example();
void custom_flags_example();
void file_events_example();
void replace_default_logger_example();
void mdc_example();
#include "spdlog/spdlog.h"
#include "spdlog/cfg/env.h" // support for loading levels from the environment variable
#include "spdlog/fmt/ostr.h" // support for user defined types
int main(int, char *[]) {
// Log levels can be loaded from argv/env using "SPDLOG_LEVEL"
load_levels_example();
spdlog::info("Welcome to spdlog version {}.{}.{} !", SPDLOG_VER_MAJOR, SPDLOG_VER_MINOR,
SPDLOG_VER_PATCH);
spdlog::warn("Easy padding in numbers like {:08d}", 12);
spdlog::critical("Support for int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}", 42);
spdlog::info("Support for floats {:03.2f}", 1.23456);
spdlog::info("Positional args are {1} {0}..", "too", "supported");
spdlog::info("{:>8} aligned, {:<8} aligned", "right", "left");
// Runtime log levels
spdlog::set_level(spdlog::level::info); // Set global log level to info
spdlog::debug("This message should not be displayed!");
spdlog::set_level(spdlog::level::trace); // Set specific logger's log level
spdlog::debug("This message should be displayed..");
// Customize msg format for all loggers
spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [thread %t] %v");
spdlog::info("This an info message with custom format");
spdlog::set_pattern("%+"); // back to default format
spdlog::set_level(spdlog::level::info);
// Backtrace support
// Loggers can store in a ring buffer all messages (including debug/trace) for later inspection.
// When needed, call dump_backtrace() to see what happened:
spdlog::enable_backtrace(10); // create ring buffer with capacity of 10 messages
for (int i = 0; i < 100; i++) {
spdlog::debug("Backtrace message {}", i); // not logged..
}
// e.g. if some error happened:
spdlog::dump_backtrace(); // log them now!
try {
stdout_logger_example();
basic_example();
rotating_example();
daily_example();
callback_example();
async_example();
binary_example();
vector_example();
multi_sink_example();
user_defined_example();
err_handler_example();
trace_example();
stopwatch_example();
udp_example();
custom_flags_example();
file_events_example();
replace_default_logger_example();
mdc_example();
// Flush all *registered* loggers using a worker thread every 3 seconds.
// note: registered loggers *must* be thread safe for this to work correctly!
spdlog::flush_every(std::chrono::seconds(3));
// Apply some function on all registered loggers
spdlog::apply_all([&](std::shared_ptr<spdlog::logger> l) { l->info("End of example."); });
// Release all spdlog resources, and drop all loggers in the registry.
// This is optional (only mandatory if using windows + async log).
spdlog::shutdown();
}
// Exceptions will only be thrown upon failed logger or sink construction (not during logging).
catch (const spdlog::spdlog_ex &ex) {
std::printf("Log initialization failed: %s\n", ex.what());
return 1;
}
}
#include "spdlog/sinks/stdout_color_sinks.h" #include "spdlog/sinks/stdout_color_sinks.h"
// or #include "spdlog/sinks/stdout_sinks.h" if no colors needed.
void stdout_logger_example() {
// Create color multi threaded logger.
auto console = spdlog::stdout_color_mt("console");
// or for stderr:
// auto console = spdlog::stderr_color_mt("error-logger");
}
#include "spdlog/sinks/basic_file_sink.h"
void basic_example() {
// Create basic file logger (not rotated).
auto my_logger = spdlog::basic_logger_mt("file_logger", "logs/basic-log.txt", true);
}
#include "spdlog/sinks/rotating_file_sink.h"
void rotating_example() {
// Create a file rotating logger with 5mb size max and 3 rotated files.
auto rotating_logger =
spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
}
#include "spdlog/sinks/daily_file_sink.h"
void daily_example() {
// Create a daily logger - a new file is created every day on 2:30am.
auto daily_logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
}
#include "spdlog/sinks/callback_sink.h"
void callback_example() {
// Create the logger
auto logger = spdlog::callback_logger_mt("custom_callback_logger",
[](const spdlog::details::log_msg & /*msg*/) {
// do what you need to do with msg
});
}
#include "spdlog/cfg/env.h"
void load_levels_example() {
// Set the log level to "info" and mylogger to "trace":
// SPDLOG_LEVEL=info,mylogger=trace && ./example
spdlog::cfg::load_env_levels();
// or from command line:
// ./example SPDLOG_LEVEL=info,mylogger=trace
// #include "spdlog/cfg/argv.h" // for loading levels from argv
// spdlog::cfg::load_argv_levels(args, argv);
}
#include "spdlog/async.h"
void async_example() {
// Default thread pool settings can be modified *before* creating the async logger:
// spdlog::init_thread_pool(32768, 1); // queue with max 32k items 1 backing thread.
auto async_file =
spdlog::basic_logger_mt<spdlog::async_factory>("async_file_logger", "logs/async_log.txt");
// alternatively:
// auto async_file =
// spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("async_file_logger",
// "logs/async_log.txt");
for (int i = 1; i < 101; ++i) {
async_file->info("Async message #{}", i);
}
}
// Log binary data as hex.
// Many types of std::container<char> types can be used.
// Iterator ranges are supported too.
// Format flags:
// {:X} - print in uppercase.
// {:s} - don't separate each byte with space.
// {:p} - don't print the position on each line start.
// {:n} - don't split the output to lines.
#if !defined SPDLOG_USE_STD_FORMAT || defined(_MSC_VER)
#include "spdlog/fmt/bin_to_hex.h"
void binary_example() {
std::vector<char> buf;
for (int i = 0; i < 80; i++) {
buf.push_back(static_cast<char>(i & 0xff));
}
spdlog::info("Binary example: {}", spdlog::to_hex(buf));
spdlog::info("Another binary example:{:n}",
spdlog::to_hex(std::begin(buf), std::begin(buf) + 10));
// more examples:
// logger->info("uppercase: {:X}", spdlog::to_hex(buf));
// logger->info("uppercase, no delimiters: {:Xs}", spdlog::to_hex(buf));
// logger->info("uppercase, no delimiters, no position info: {:Xsp}", spdlog::to_hex(buf));
// logger->info("hexdump style: {:a}", spdlog::to_hex(buf));
// logger->info("hexdump style, 20 chars per line {:a}", spdlog::to_hex(buf, 20));
}
#else
void binary_example() {
// not supported with std::format yet
}
#endif
// Log a vector of numbers
#ifndef SPDLOG_USE_STD_FORMAT
#include "spdlog/fmt/ranges.h"
void vector_example() {
std::vector<int> vec = {1, 2, 3};
spdlog::info("Vector example: {}", vec);
}
#else int main(int, char *[]) {
void vector_example() {} spdlog::lite_logger logger("console", {std::make_shared<spdlog::sinks::stdout_color_sink_mt>()});
#endif logger.info("Hello {} {} !!", "param1", 123.4);
logger.warn("Some warning message");
// ! DSPDLOG_USE_STD_FORMAT
// Compile time log levels.
// define SPDLOG_ACTIVE_LEVEL to required level (e.g. SPDLOG_LEVEL_TRACE)
void trace_example() {
// trace from default logger
SPDLOG_TRACE("Some trace message.. {} ,{}", 1, 3.23);
// debug from default logger
SPDLOG_DEBUG("Some debug message.. {} ,{}", 1, 3.23);
// trace from logger object
auto logger = spdlog::get("file_logger");
SPDLOG_LOGGER_TRACE(logger, "another trace message");
}
// stopwatch example
#include "spdlog/stopwatch.h"
#include <thread>
void stopwatch_example() {
spdlog::stopwatch sw;
std::this_thread::sleep_for(std::chrono::milliseconds(123));
spdlog::info("Stopwatch: {} seconds", sw);
}
#include "spdlog/sinks/udp_sink.h"
void udp_example() {
spdlog::sinks::udp_sink_config cfg("127.0.0.1", 11091);
auto my_logger = spdlog::udp_logger_mt("udplog", cfg);
my_logger->set_level(spdlog::level::debug);
my_logger->info("hello world");
}
// A logger with multiple sinks (stdout and file) - each with a different format and log level.
void multi_sink_example() {
auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
console_sink->set_level(spdlog::level::warn);
console_sink->set_pattern("[multi_sink_example] [%^%l%$] %v");
auto file_sink =
std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", true);
file_sink->set_level(spdlog::level::trace);
spdlog::logger logger("multi_sink", {console_sink, file_sink});
logger.set_level(spdlog::level::debug);
logger.warn("this should appear in both console and file");
logger.info("this message should not appear in the console, only in the file");
}
// User defined types logging
struct my_type {
int i = 0;
explicit my_type(int i)
: i(i){}
};
#ifndef SPDLOG_USE_STD_FORMAT // when using fmtlib
template <>
struct fmt::formatter<my_type> : fmt::formatter<std::string> {
auto format(my_type my, format_context &ctx) const -> decltype(ctx.out()) {
return fmt::format_to(ctx.out(), "[my_type i={}]", my.i);
}
};
#else // when using std::format
template <>
struct std::formatter<my_type> : std::formatter<std::string> {
auto format(my_type my, format_context &ctx) const -> decltype(ctx.out()) {
return std::format_to(ctx.out(), "[my_type i={}]", my.i);
}
};
#endif
void user_defined_example() { spdlog::info("user defined type: {}", my_type(14)); }
// Custom error handler. Will be triggered on log failure.
void err_handler_example() {
// can be set globally or per logger(logger->set_error_handler(..))
spdlog::set_error_handler([](const std::string &msg) {
printf("*** Custom log error handler: %s ***\n", msg.c_str());
});
}
// syslog example (linux/osx/freebsd)
#ifndef _WIN32
#include "spdlog/sinks/syslog_sink.h"
void syslog_example() {
std::string ident = "spdlog-example";
auto syslog_logger = spdlog::syslog_logger_mt("syslog", ident, LOG_PID);
syslog_logger->warn("This is warning that will end up in syslog.");
}
#endif
// Android example.
#if defined(__ANDROID__)
#include "spdlog/sinks/android_sink.h"
void android_example() {
std::string tag = "spdlog-android";
auto android_logger = spdlog::android_logger_mt("android", tag);
android_logger->critical("Use \"adb shell logcat\" to view this message.");
}
#endif
// Log patterns can contain custom flags.
// this will add custom flag '%*' which will be bound to a <my_formatter_flag> instance
#include "spdlog/pattern_formatter.h"
class my_formatter_flag : public spdlog::custom_flag_formatter {
public:
void format(const spdlog::details::log_msg &,
const std::tm &,
spdlog::memory_buf_t &dest) override {
std::string some_txt = "custom-flag";
dest.append(some_txt.data(), some_txt.data() + some_txt.size());
}
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

3
include/spdlog/details/file_helper-inl.h
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@ -101,7 +101,8 @@ SPDLOG_INLINE void file_helper::write(const memory_buf_t &buf) {
if (fd_ == nullptr) return; if (fd_ == nullptr) return;
size_t msg_size = buf.size(); size_t msg_size = buf.size();
auto data = buf.data(); auto data = buf.data();
if (std::fwrite(data, 1, msg_size, fd_) != msg_size) {
if (!details::os::fwrite_bytes(data, msg_size, fd_)) {
throw_spdlog_ex("Failed writing to file " + os::filename_to_str(filename_), errno); throw_spdlog_ex("Failed writing to file " + os::filename_to_str(filename_), errno);
} }
} }

12
include/spdlog/details/os-inl.h
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@ -589,6 +589,18 @@ SPDLOG_INLINE bool fsync(FILE *fp) {
#endif #endif
} }
// Do non-locking fwrite if possible by the os or use the regular locking fwrite
// Return true on success.
SPDLOG_INLINE bool fwrite_bytes(const void *ptr, const size_t n_bytes, FILE *fp) {
#if defined(_WIN32) && defined(SPDLOG_FWRITE_UNLOCKED)
return _fwrite_nolock(ptr, 1, n_bytes, fp) == n_bytes;
#elif defined(SPDLOG_FWRITE_UNLOCKED)
return ::fwrite_unlocked(ptr, 1, n_bytes, fp) == n_bytes;
#else
return std::fwrite(ptr, 1, n_bytes, fp) == n_bytes;
#endif
}
} // namespace os } // namespace os
} // namespace details } // namespace details
} // namespace spdlog } // namespace spdlog

4
include/spdlog/details/os.h
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@ -114,6 +114,10 @@ SPDLOG_API std::string getenv(const char *field);
// Return true on success. // Return true on success.
SPDLOG_API bool fsync(FILE *fp); SPDLOG_API bool fsync(FILE *fp);
// Do non-locking fwrite if possible by the os or use the regular locking fwrite
// Return true on success.
SPDLOG_API bool fwrite_bytes(const void *ptr, const size_t n_bytes, FILE *fp);
} // namespace os } // namespace os
} // namespace details } // namespace details
} // namespace spdlog } // namespace spdlog

4
include/spdlog/sinks/ansicolor_sink-inl.h
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@ -106,14 +106,14 @@ SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color_mode(color_mode mode)
template <typename ConsoleMutex> template <typename ConsoleMutex>
SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::print_ccode_(const string_view_t &color_code) { SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::print_ccode_(const string_view_t &color_code) {
fwrite(color_code.data(), sizeof(char), color_code.size(), target_file_); details::os::fwrite_bytes(color_code.data(), color_code.size(), target_file_);
} }
template <typename ConsoleMutex> template <typename ConsoleMutex>
SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::print_range_(const memory_buf_t &formatted, SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::print_range_(const memory_buf_t &formatted,
size_t start, size_t start,
size_t end) { size_t end) {
fwrite(formatted.data() + start, sizeof(char), end - start, target_file_); details::os::fwrite_bytes(formatted.data() + start, end - start, target_file_);
} }
template <typename ConsoleMutex> template <typename ConsoleMutex>

3
include/spdlog/sinks/stdout_sinks-inl.h
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@ -10,6 +10,7 @@
#include <memory> #include <memory>
#include <spdlog/details/console_globals.h> #include <spdlog/details/console_globals.h>
#include <spdlog/pattern_formatter.h> #include <spdlog/pattern_formatter.h>
#include <spdlog/details/os.h>
#ifdef _WIN32 #ifdef _WIN32
// under windows using fwrite to non-binary stream results in \r\r\n (see issue #1675) // under windows using fwrite to non-binary stream results in \r\r\n (see issue #1675)
@ -67,7 +68,7 @@ SPDLOG_INLINE void stdout_sink_base<ConsoleMutex>::log(const details::log_msg &m
std::lock_guard<mutex_t> lock(mutex_); std::lock_guard<mutex_t> lock(mutex_);
memory_buf_t formatted; memory_buf_t formatted;
formatter_->format(msg, formatted); formatter_->format(msg, formatted);
::fwrite(formatted.data(), sizeof(char), formatted.size(), file_); details::os::fwrite_bytes(formatted.data(), formatted.size(), file_);
#endif // WIN32 #endif // WIN32
::fflush(file_); // flush every line to terminal ::fflush(file_); // flush every line to terminal
} }

31
tests/test_misc.cpp
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@ -185,3 +185,34 @@ TEST_CASE("utf8 to utf16 conversion using windows api", "[windows utf]") {
REQUIRE(std::wstring(buffer.data(), buffer.size()) == std::wstring(L"\x306d\x3053")); REQUIRE(std::wstring(buffer.data(), buffer.size()) == std::wstring(L"\x306d\x3053"));
} }
#endif #endif
struct auto_closer {
FILE* fp = nullptr;
explicit auto_closer(FILE* f) : fp(f) {}
auto_closer(const auto_closer&) = delete;
auto_closer& operator=(const auto_closer&) = delete;
~auto_closer() {
if (fp != nullptr) (void)std::fclose(fp);
}
};
TEST_CASE("os::fwrite_bytes", "[os]") {
using spdlog::details::os::fwrite_bytes;
using spdlog::details::os::create_dir;
const char* filename = "log_tests/test_fwrite_bytes.txt";
const char *msg = "hello";
prepare_logdir();
REQUIRE(create_dir("log_tests"));
{
auto_closer closer(std::fopen(filename, "wb"));
REQUIRE(closer.fp != nullptr);
REQUIRE(fwrite_bytes(msg, std::strlen(msg), closer.fp) == true);
REQUIRE(fwrite_bytes(msg, 0, closer.fp) == true);
std::fflush(closer.fp);
REQUIRE(spdlog::details::os::filesize(closer.fp) == 5);
}
// fwrite_bytes should return false on write failure
auto_closer closer(std::fopen(filename, "r"));
REQUIRE(closer.fp != nullptr);
REQUIRE_FALSE(fwrite_bytes("Hello", 5, closer.fp));
}

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