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// Copyright (C) 2019-2022 Joel Rosdahl and other contributors
//
// See doc/AUTHORS.adoc for a complete list of contributors.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#include "AtomicFile.hpp"
#include "TemporaryFile.hpp"
#include "Util.hpp"
#include "assertions.hpp"
#include <core/exceptions.hpp>
#include <fmtmacros.hpp>
AtomicFile::AtomicFile(const std::string& path, Mode mode) : m_path(path)
{
TemporaryFile tmp_file(path);
m_stream = fdopen(tmp_file.fd.release(), mode == Mode::binary ? "w+b" : "w+");
m_tmp_path = std::move(tmp_file.path);
}
AtomicFile::~AtomicFile()
{
if (m_stream) {
// commit() was not called so remove the lingering temporary file.
fclose(m_stream);
Util::unlink_tmp(m_tmp_path);
}
}
void
AtomicFile::write(std::string_view data)
{
if (fwrite(data.data(), data.size(), 1, m_stream) != 1) {
throw core::Error(
FMT("failed to write data to {}: {}", m_path, strerror(errno)));
}
}
void
AtomicFile::write(nonstd::span<const uint8_t> data)
{
if (fwrite(data.data(), data.size(), 1, m_stream) != 1) {
throw core::Error(
FMT("failed to write data to {}: {}", m_path, strerror(errno)));
}
}
void
AtomicFile::flush()
{
if (fflush(m_stream) != 0) {
throw core::Error(
FMT("failed to flush data to {}: {}", m_path, strerror(errno)));
}
}
void
AtomicFile::commit()
{
ASSERT(m_stream);
int result = fclose(m_stream);
m_stream = nullptr;
if (result == EOF) {
Util::unlink_tmp(m_tmp_path);
throw core::Error(
FMT("failed to write data to {}: {}", m_path, strerror(errno)));
}
Util::rename(m_tmp_path, m_path);
}
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