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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2025
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/FileLog.h"
#include "td/utils/common.h"
#include "td/utils/logging.h"
#include "td/utils/port/FileFd.h"
#include "td/utils/port/path.h"
#include "td/utils/port/StdStreams.h"
#include "td/utils/port/thread_local.h"
#include "td/utils/Slice.h"
#include "td/utils/SliceBuilder.h"
#include "td/utils/Time.h"
namespace td {
Status FileLog::init(string path, int64 rotate_threshold, bool redirect_stderr) {
if (path.empty()) {
return Status::Error("Log file path must be non-empty");
}
if (path == path_) {
set_rotate_threshold(rotate_threshold);
return Status::OK();
}
TRY_RESULT(fd, FileFd::open(path, FileFd::Create | FileFd::Write | FileFd::Append));
fd_.close();
fd_ = std::move(fd);
if (!Stderr().empty() && redirect_stderr) {
fd_.get_native_fd().duplicate(Stderr().get_native_fd()).ignore();
}
auto r_path = realpath(path, true);
if (r_path.is_error()) {
path_ = std::move(path);
} else {
path_ = r_path.move_as_ok();
}
TRY_RESULT_ASSIGN(size_, fd_.get_size());
rotate_threshold_ = rotate_threshold;
redirect_stderr_ = redirect_stderr;
return Status::OK();
}
Slice FileLog::get_path() const {
return path_;
}
vector<string> FileLog::get_file_paths() {
vector<string> result;
if (!path_.empty()) {
result.push_back(path_);
result.push_back(PSTRING() << path_ << ".old");
}
return result;
}
void FileLog::set_rotate_threshold(int64 rotate_threshold) {
rotate_threshold_ = rotate_threshold;
}
int64 FileLog::get_rotate_threshold() const {
return rotate_threshold_;
}
bool FileLog::get_redirect_stderr() const {
return redirect_stderr_;
}
void FileLog::do_append(int log_level, CSlice slice) {
auto start_time = Time::now();
if (size_ > rotate_threshold_ || want_rotate_.load(std::memory_order_relaxed)) {
auto status = rename(path_, PSLICE() << path_ << ".old");
if (status.is_error()) {
process_fatal_error(PSLICE() << status << " in " << __FILE__ << " at " << __LINE__ << '\n');
}
do_after_rotation();
}
while (!slice.empty()) {
if (redirect_stderr_) {
while (has_log_guard()) {
// spin
}
}
auto r_size = fd_.write(slice);
if (r_size.is_error()) {
process_fatal_error(PSLICE() << r_size.error() << " in " << __FILE__ << " at " << __LINE__ << '\n');
}
auto written = r_size.ok();
size_ += static_cast<int64>(written);
slice.remove_prefix(written);
}
auto total_time = Time::now() - start_time;
if (total_time >= 0.1 && log_level >= 1) {
auto thread_id = get_thread_id();
auto r_size = fd_.write(PSLICE() << "[ 2][t" << (0 <= thread_id && thread_id < 10 ? " " : "") << thread_id
<< "] !!! Previous logging took " << total_time << " seconds !!!\n");
r_size.ignore();
}
}
void FileLog::after_rotation() {
if (path_.empty()) {
return;
}
do_after_rotation();
}
void FileLog::lazy_rotate() {
want_rotate_ = true;
}
void FileLog::do_after_rotation() {
want_rotate_ = false;
ScopedDisableLog disable_log; // to ensure that nothing will be printed to the closed log
CHECK(!path_.empty());
fd_.close();
auto r_fd = FileFd::open(path_, FileFd::Create | FileFd::Write | FileFd::Append);
if (r_fd.is_error()) {
process_fatal_error(PSLICE() << r_fd.error() << " in " << __FILE__ << " at " << __LINE__ << '\n');
}
fd_ = r_fd.move_as_ok();
if (!Stderr().empty() && redirect_stderr_) {
fd_.get_native_fd().duplicate(Stderr().get_native_fd()).ignore();
}
auto r_size = fd_.get_size();
if (r_fd.is_error()) {
process_fatal_error(PSLICE() << "Failed to get log size: " << r_fd.error() << " in " << __FILE__ << " at "
<< __LINE__ << '\n');
}
size_ = r_size.move_as_ok();
}
Result<unique_ptr<LogInterface>> FileLog::create(string path, int64 rotate_threshold, bool redirect_stderr) {
auto l = make_unique<FileLog>();
TRY_STATUS(l->init(std::move(path), rotate_threshold, redirect_stderr));
return std::move(l);
}
} // namespace td
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