blob: c22d6659b2357d4b8bb41ceb0b572155886bb3a3 [file] [log] [blame]
// Copyright 2022 The Pigweed Authors
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_transfer/atomic_file_transfer_handler.h"
#include <filesystem>
#include <system_error>
#include "pw_log/log.h"
#include "pw_status/status.h"
#include "pw_stream/std_file_stream.h"
#include "pw_transfer_private/filename_generator.h"
namespace pw::transfer {
Status AtomicFileTransferHandler::PrepareRead() {
auto file_path = path_.c_str();
PW_LOG_DEBUG("Preparing read for file %s", file_path);
if (!std::filesystem::exists(file_path)) {
PW_LOG_ERROR("File does not exist, path: %s", file_path);
return Status::NotFound();
return OkStatus();
void AtomicFileTransferHandler::FinalizeRead(Status) {
Status AtomicFileTransferHandler::PrepareWrite() {
const std::string tmp_file = GetTempFilePath(path_);
PW_LOG_DEBUG("Preparing write for file %s", tmp_file.c_str());
return OkStatus();
Status AtomicFileTransferHandler::FinalizeWrite(Status status) {
const auto tmp_file = GetTempFilePath(path_);
auto temp_file_path = tmp_file.c_str();
auto file_path = path_.c_str();
if (!status.ok() || !std::filesystem::exists(temp_file_path) ||
std::filesystem::is_empty(temp_file_path)) {
PW_LOG_ERROR("Status not ok, remove file %s", temp_file_path);
// Remove temp file if transfer fails.
return std::filesystem::remove(tmp_file) ? status : Status::Aborted();
PW_LOG_DEBUG("Renaming file from: %s, to: %s", temp_file_path, file_path);
std::error_code err;
std::filesystem::rename(temp_file_path, file_path, err);
if (err) {
PW_LOG_ERROR("Error during renaming of file %s", temp_file_path);
return std::filesystem::remove(tmp_file) ? Status::Internal()
: Status::Aborted();
PW_LOG_INFO("File transfer was successful.");
return OkStatus();
} // namespace pw::transfer