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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_DBUS_PROPERTIES_DBUS_PROPERTIES_H_
#define COMPONENTS_DBUS_PROPERTIES_DBUS_PROPERTIES_H_
#include "base/component_export.h"
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "components/dbus/properties/types.h"
#include "dbus/bus.h"
#include "dbus/exported_object.h"
// https://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties
class COMPONENT_EXPORT(DBUS) DbusProperties {
public:
using InitializedCallback = base::OnceCallback<void(bool success)>;
// Registers method handlers for the properties interface. The handlers will
// not be removed until the bus is shut down.
DbusProperties(dbus::ExportedObject* exported_object,
InitializedCallback callback);
DbusProperties(const DbusProperties&) = delete;
DbusProperties& operator=(const DbusProperties&) = delete;
~DbusProperties();
void RegisterInterface(const std::string& interface);
template <typename T>
void SetProperty(const std::string& interface,
const std::string& name,
T&& value,
bool emit_signal = true,
bool send_change = true) {
auto interface_it = properties_.find(interface);
DCHECK(interface_it != properties_.end());
auto property_it = interface_it->second.find(name);
DbusVariant new_value = MakeDbusVariant(std::forward<T>(value));
const bool send_signal =
emit_signal && (property_it == interface_it->second.end() ||
property_it->second != new_value);
(interface_it->second)[name] = std::move(new_value);
if (send_signal)
PropertyUpdated(interface, name, send_change);
}
DbusVariant* GetProperty(const std::string& interface,
const std::string& property_name);
// If emitting a PropertiesChangedSignal is desired, this should be called
// after an existing property is modified through any means other than
// SetProperty().
void PropertyUpdated(const std::string& interface,
const std::string& property_name,
bool send_change = true);
private:
void OnExported(const std::string& interface_name,
const std::string& method_name,
bool success);
void OnGetAllProperties(dbus::MethodCall* method_call,
dbus::ExportedObject::ResponseSender response_sender);
void OnGetProperty(dbus::MethodCall* method_call,
dbus::ExportedObject::ResponseSender response_sender);
void OnSetProperty(dbus::MethodCall* method_call,
dbus::ExportedObject::ResponseSender response_sender);
bool initialized_ = false;
raw_ptr<dbus::ExportedObject, AcrossTasksDanglingUntriaged> exported_object_ =
nullptr;
base::RepeatingCallback<void(bool)> barrier_;
// A map from interface name to a map of properties. The properties map is
// from property name to property value.
std::map<std::string, std::map<std::string, DbusVariant>> properties_;
base::WeakPtrFactory<DbusProperties> weak_factory_{this};
};
#endif // COMPONENTS_DBUS_PROPERTIES_DBUS_PROPERTIES_H_
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