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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/data_migration/file_transfer.h"
#include "base/check.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/path_service.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "chromeos/ash/components/data_migration/constants.h"
#include "chromeos/ash/components/data_migration/pending_file_transfer_queue.h"
#include "chromeos/ash/components/nearby/common/connections_manager/nearby_connection.h"
namespace data_migration {
namespace {
base::FilePath GetPayloadPath(int64_t payload_id) {
base::FilePath home_dir;
CHECK(base::PathService::Get(base::DIR_HOME, &home_dir));
return home_dir.Append(kPayloadTargetDir)
.Append(base::StrCat({"payload_", base::NumberToString(payload_id)}));
}
} // namespace
FileTransfer::FileTransfer(
NearbyConnection* nearby_connection,
NearbyConnectionsManager* nearby_connections_manager,
PendingFileTransferQueue& pending_file_transfer_queue,
base::OnceCallback<void(bool)> completion_cb)
: nearby_connection_(nearby_connection),
nearby_connections_manager_(nearby_connections_manager),
completion_cb_(std::move(completion_cb)) {
CHECK(nearby_connection_);
CHECK(completion_cb_);
pending_file_transfer_queue.Pop(base::BindOnce(
&FileTransfer::StartFileTransfer, weak_ptr_factory_.GetWeakPtr()));
}
FileTransfer::~FileTransfer() = default;
void FileTransfer::StartFileTransfer(int64_t payload_id) {
file_receiver_.emplace(
payload_id, GetPayloadPath(payload_id),
FileReceiver::Observer(/*on_file_registered=*/base::BindOnce(
&FileTransfer::SendCts,
weak_ptr_factory_.GetWeakPtr(), payload_id),
std::move(completion_cb_)),
nearby_connections_manager_.get());
}
// Clear-to-Send is only sent to the remote device after the file has been
// registered with the NC library. If the remote device were to start
// transmitting the file before it's been registered, it would be a race
// condition and the transmission may fail.
void FileTransfer::SendCts(int64_t payload_id) {
std::string payload_id_as_string = base::NumberToString(payload_id);
VLOG(1) << "Sending CTS for file payload " << payload_id;
nearby_connection_->Write(std::vector<uint8_t>(payload_id_as_string.begin(),
payload_id_as_string.end()));
}
} // namespace data_migration
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