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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/media_galleries/chromeos/mtp_read_file_worker.h"
#include <utility>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/numerics/safe_conversions.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "chrome/browser/media_galleries/chromeos/snapshot_file_details.h"
#include "components/storage_monitor/storage_monitor.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "services/device/public/mojom/mtp_manager.mojom.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
using storage_monitor::StorageMonitor;
namespace {
// Appends |data| to the snapshot file specified by the |snapshot_file_path| on
// a background sequence that allows IO. Returns the number of bytes written to
// the snapshot file. In case of failure, returns zero.
uint32_t WriteDataChunkIntoSnapshotFileOnFileThread(
const base::FilePath& snapshot_file_path,
const std::string& data) {
return base::AppendToFile(snapshot_file_path, data)
? base::checked_cast<uint32_t>(data.size())
: 0;
}
} // namespace
MTPReadFileWorker::MTPReadFileWorker(const std::string& device_handle)
: device_handle_(device_handle) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(!device_handle_.empty());
}
MTPReadFileWorker::~MTPReadFileWorker() = default;
void MTPReadFileWorker::WriteDataIntoSnapshotFile(
SnapshotRequestInfo request_info,
const base::File::Info& snapshot_file_info) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
ReadDataChunkFromDeviceFile(std::make_unique<SnapshotFileDetails>(
std::move(request_info), snapshot_file_info));
}
void MTPReadFileWorker::ReadDataChunkFromDeviceFile(
std::unique_ptr<SnapshotFileDetails> snapshot_file_details) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(snapshot_file_details.get());
// To avoid calling |snapshot_file_details| methods and passing ownership of
// |snapshot_file_details| in the same_line.
SnapshotFileDetails* snapshot_file_details_ptr = snapshot_file_details.get();
auto* mtp_device_manager =
StorageMonitor::GetInstance()->media_transfer_protocol_manager();
mtp_device_manager->ReadFileChunk(
device_handle_, snapshot_file_details_ptr->file_id(),
snapshot_file_details_ptr->bytes_written(),
snapshot_file_details_ptr->BytesToRead(),
base::BindOnce(&MTPReadFileWorker::OnDidReadDataChunkFromDeviceFile,
weak_ptr_factory_.GetWeakPtr(),
std::move(snapshot_file_details)));
}
void MTPReadFileWorker::OnDidReadDataChunkFromDeviceFile(
std::unique_ptr<SnapshotFileDetails> snapshot_file_details,
const std::string& data,
bool error) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(snapshot_file_details.get());
snapshot_file_details->set_error_occurred(
error || (data.size() != snapshot_file_details->BytesToRead()));
if (snapshot_file_details->error_occurred()) {
OnDidWriteIntoSnapshotFile(std::move(snapshot_file_details));
return;
}
// To avoid calling |snapshot_file_details| methods and passing ownership of
// |snapshot_file_details| in the same_line.
SnapshotFileDetails* snapshot_file_details_ptr = snapshot_file_details.get();
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
base::BindOnce(&WriteDataChunkIntoSnapshotFileOnFileThread,
snapshot_file_details_ptr->snapshot_file_path(), data),
base::BindOnce(&MTPReadFileWorker::OnDidWriteDataChunkIntoSnapshotFile,
weak_ptr_factory_.GetWeakPtr(),
std::move(snapshot_file_details)));
}
void MTPReadFileWorker::OnDidWriteDataChunkIntoSnapshotFile(
std::unique_ptr<SnapshotFileDetails> snapshot_file_details,
uint32_t bytes_written) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(snapshot_file_details.get());
if (snapshot_file_details->AddBytesWritten(bytes_written)) {
if (!snapshot_file_details->IsSnapshotFileWriteComplete()) {
ReadDataChunkFromDeviceFile(std::move(snapshot_file_details));
return;
}
} else {
snapshot_file_details->set_error_occurred(true);
}
OnDidWriteIntoSnapshotFile(std::move(snapshot_file_details));
}
void MTPReadFileWorker::OnDidWriteIntoSnapshotFile(
std::unique_ptr<SnapshotFileDetails> snapshot_file_details) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(snapshot_file_details.get());
if (snapshot_file_details->error_occurred()) {
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(snapshot_file_details->error_callback(),
base::File::FILE_ERROR_FAILED));
return;
}
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(snapshot_file_details->success_callback(),
snapshot_file_details->file_info(),
snapshot_file_details->snapshot_file_path()));
}
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