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// Copyright 2017 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/dbus/virtual_file_provider/virtual_file_provider_client.h"
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "chromeos/ash/components/dbus/virtual_file_provider/fake_virtual_file_provider_client.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace ash {
namespace {
VirtualFileProviderClient* g_instance = nullptr;
class VirtualFileProviderClientImpl : public VirtualFileProviderClient {
public:
VirtualFileProviderClientImpl() {}
VirtualFileProviderClientImpl(const VirtualFileProviderClientImpl&) = delete;
VirtualFileProviderClientImpl& operator=(
const VirtualFileProviderClientImpl&) = delete;
~VirtualFileProviderClientImpl() override = default;
// VirtualFileProviderClient override:
void GenerateVirtualFileId(int64_t size,
GenerateVirtualFileIdCallback callback) override {
dbus::MethodCall method_call(
virtual_file_provider::kVirtualFileProviderInterface,
virtual_file_provider::kGenerateVirtualFileIdMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendInt64(size);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&VirtualFileProviderClientImpl::OnGenerateVirtualFileId,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void OpenFileById(const std::string& id,
OpenFileByIdCallback callback) override {
dbus::MethodCall method_call(
virtual_file_provider::kVirtualFileProviderInterface,
virtual_file_provider::kOpenFileByIdMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendString(std::move(id));
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&VirtualFileProviderClientImpl::OnOpenFileById,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
// chromeos::DBusClient override.
void Init(dbus::Bus* bus) override {
proxy_ = bus->GetObjectProxy(
virtual_file_provider::kVirtualFileProviderServiceName,
dbus::ObjectPath(
virtual_file_provider::kVirtualFileProviderServicePath));
}
private:
// Runs the callback with GenerateVirtualFileId method call result.
void OnGenerateVirtualFileId(GenerateVirtualFileIdCallback callback,
dbus::Response* response) {
if (!response) {
std::move(callback).Run(std::nullopt);
return;
}
dbus::MessageReader reader(response);
std::string id;
if (!reader.PopString(&id)) {
LOG(ERROR) << "Invalid method call result.";
std::move(callback).Run(std::nullopt);
return;
}
std::move(callback).Run(std::move(id));
}
// Runs the callback with OpenFileById method call result.
void OnOpenFileById(OpenFileByIdCallback callback, dbus::Response* response) {
if (!response) {
std::move(callback).Run(base::ScopedFD());
return;
}
dbus::MessageReader reader(response);
base::ScopedFD fd;
if (!reader.PopFileDescriptor(&fd)) {
LOG(ERROR) << "Invalid method call result.";
std::move(callback).Run(base::ScopedFD());
return;
}
std::move(callback).Run(std::move(fd));
}
raw_ptr<dbus::ObjectProxy> proxy_ = nullptr;
base::WeakPtrFactory<VirtualFileProviderClientImpl> weak_ptr_factory_{this};
};
} // namespace
// static
VirtualFileProviderClient* VirtualFileProviderClient::Get() {
return g_instance;
}
// static
void VirtualFileProviderClient::Initialize(dbus::Bus* bus) {
CHECK(bus);
(new VirtualFileProviderClientImpl())->Init(bus);
}
// static
void VirtualFileProviderClient::InitializeFake() {
(new FakeVirtualFileProviderClient())->Init(nullptr);
}
// static
void VirtualFileProviderClient::Shutdown() {
CHECK(g_instance);
delete g_instance;
}
VirtualFileProviderClient::VirtualFileProviderClient() {
CHECK(!g_instance);
g_instance = this;
}
VirtualFileProviderClient::~VirtualFileProviderClient() {
CHECK_EQ(g_instance, this);
g_instance = nullptr;
}
} // namespace ash
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