136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/utils/AsyncFileLog.h"
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#include "td/utils/port/FileFd.h"
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#include "td/utils/port/path.h"
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#include "td/utils/SliceBuilder.h"
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namespace td {
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Status AsyncFileLog::init(string path, int64 rotate_threshold) {
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CHECK(path_.empty());
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CHECK(!path.empty());
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TRY_RESULT(fd, FileFd::open(path, FileFd::Create | FileFd::Write | FileFd::Append));
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auto r_path = realpath(path, true);
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if (r_path.is_error()) {
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path_ = std::move(path);
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} else {
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path_ = r_path.move_as_ok();
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}
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TRY_RESULT(size, fd.get_size());
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queue_ = td::make_unique<MpscPollableQueue<Query>>();
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queue_->init();
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logging_thread_ =
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td::thread([queue = queue_.get(), fd = std::move(fd), path = path_, size, rotate_threshold]() mutable {
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auto after_rotation = [&] {
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ScopedDisableLog disable_log; // to ensure that nothing will be printed to the closed log
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fd.close();
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auto r_fd = FileFd::open(path, FileFd::Create | FileFd::Truncate | FileFd::Write);
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if (r_fd.is_error()) {
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process_fatal_error(PSLICE() << r_fd.error() << " in " << __FILE__ << " at " << __LINE__ << '\n');
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}
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fd = r_fd.move_as_ok();
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size = 0;
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};
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auto append = [&](CSlice slice) {
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if (size > rotate_threshold) {
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auto status = rename(path, PSLICE() << path << ".old");
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if (status.is_error()) {
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process_fatal_error(PSLICE() << status << " in " << __FILE__ << " at " << __LINE__ << '\n');
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}
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after_rotation();
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}
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while (!slice.empty()) {
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auto r_size = fd.write(slice);
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if (r_size.is_error()) {
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process_fatal_error(PSLICE() << r_size.error() << " in " << __FILE__ << " at " << __LINE__ << '\n');
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}
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auto written = r_size.ok();
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size += static_cast<int64>(written);
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slice.remove_prefix(written);
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}
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};
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while (true) {
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int ready_count = queue->reader_wait_nonblock();
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if (ready_count == 0) {
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queue->reader_get_event_fd().wait(1000);
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continue;
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}
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bool need_close = false;
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while (ready_count-- > 0) {
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Query query = queue->reader_get_unsafe();
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switch (query.type_) {
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case Query::Type::Log:
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append(query.data_);
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break;
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case Query::Type::AfterRotation:
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after_rotation();
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break;
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case Query::Type::Close:
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need_close = true;
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break;
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default:
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process_fatal_error("Invalid query type in AsyncFileLog");
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}
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}
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queue->reader_flush();
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if (need_close) {
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fd.close();
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break;
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}
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}
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});
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return Status::OK();
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}
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AsyncFileLog::~AsyncFileLog() {
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if (queue_ == nullptr) {
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return;
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}
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Query query;
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query.type_ = Query::Type::Close;
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queue_->writer_put(std::move(query));
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logging_thread_.join();
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}
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vector<string> AsyncFileLog::get_file_paths() {
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vector<string> result;
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if (!path_.empty()) {
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result.push_back(path_);
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result.push_back(PSTRING() << path_ << ".old");
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}
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return result;
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}
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void AsyncFileLog::after_rotation() {
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Query query;
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query.type_ = Query::Type::AfterRotation;
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if (queue_ == nullptr) {
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process_fatal_error("AsyncFileLog is not inited");
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}
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queue_->writer_put(std::move(query));
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}
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void AsyncFileLog::do_append(int log_level, CSlice slice) {
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Query query;
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query.data_ = slice.str();
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if (queue_ == nullptr) {
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process_fatal_error("AsyncFileLog is not inited");
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}
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queue_->writer_put(std::move(query));
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}
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} // namespace td
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