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// GDBus++ - glib2 GDBus C++ wrapper
//
// SPDX-License-Identifier: AGPL-3.0-only
//
// Copyright (C) OpenVPN Inc <sales@openvpn.net>
// Copyright (C) David Sommerseth <davids@openvpn.net>
//
/**
* @file example-proxy2.cpp
*
* @brief Variant of example-proxy.cpp which implements the proxy
* as a C++ object
*
* To compile this program:
*
* $ c++ -std=c++17 $(pkg-config gdbuspp glib-2.0 gio-2.0 gio-unix-2.0 --cflags --libs) -o example-proxy2 example-proxy2.cpp
*
*/
#include <iostream>
#include <string>
#include <gdbuspp/connection.hpp>
#include <gdbuspp/proxy.hpp>
#include <gdbuspp/glib2/utils.hpp>
class MyServiceProxy
{
public:
/**
* Enforce this object to always be set up with a smart pointer
*
* @param c
* @return std::shared_ptr<MyServiceProxy>
*/
[[nodiscard]] static std::shared_ptr<MyServiceProxy> Create(DBus::Connection::Ptr c)
{
return std::shared_ptr<MyServiceProxy>(new MyServiceProxy(c));
}
/**
* Calls the net.example.myinterface.MethodWithArgs D-Bus method
* in the /example/myobject D-Bus object in the net.example.myservice
* D-Bus service.
*
* This method takes two string arguments as input and returns a
* a single string in return
*
* @param string1
* @param string2
* @return const std::string
*/
const std::string MethodWithArgs(const std::string &string1,
const std::string &string2)
{
// Create the "argument pack" containing of 2 strings -> (ss)
GVariantBuilder *args_builder = glib2::Builder::Create("(ss)");
glib2::Builder::Add(args_builder, string1);
glib2::Builder::Add(args_builder, string2);
GVariant *arguments = glib2::Builder::Finish(args_builder);
// Perform the D-Bus method call
GVariant *response = proxy->Call(preset,
"MethodWithArgs",
arguments);
// Extract the response from the object. This method returns only a
// single string.
const auto result = glib2::Value::Extract<std::string>(response, 0);
g_variant_unref(response);
return result;
}
/**
* Calls the net.example.myinterface.MyMethod D-Bus method
* in the /example/myobject D-Bus object in the net.example.myservice
* D-Bus service.
*
* This method takes no arguments and provides no response.
*/
void MyMethod()
{
GVariant *response = proxy->Call(preset, "MyMethod");
g_variant_unref(response);
}
/**
* Generic method to retrieve a property value from the service
*
* @tparam T C++ data type to extract the data as; must
* be the equivalent type of the D-Bus object's
* data type
* @param property_name Name of the D-Bus object property
* @return T
*/
template <typename T>
T GetProperty(const std::string &property_name) const
{
return proxy->GetProperty<T>(preset, property_name);
}
/**
* Generic method to modify a property value stored in the service
*
* @tparam T C++ data type to extract the data as; must
* be the equivalent type of the D-Bus object's
* data type
* @param property_name Name of the D-Bus object property
* @param value The new value for the property
*/
template <typename T>
void SetProperty(const std::string &property_name,
const T &value) const
{
proxy->SetProperty(preset, property_name, value);
}
private:
DBus::Proxy::Client::Ptr proxy = nullptr;
DBus::Proxy::TargetPreset::Ptr preset = nullptr;
MyServiceProxy(DBus::Connection::Ptr conn)
{
proxy = DBus::Proxy::Client::Create(conn, "net.example.myservice");
preset = DBus::Proxy::TargetPreset::Create("/example/myobject",
"net.example.myinterface");
}
};
int main(int argc, char **argv)
{
try
{
// Get a connection to the Session D-Bus
auto connection = DBus::Connection::Create(DBus::BusType::SESSION);
// Setup a client proxy to our example-service
auto proxy = MyServiceProxy::Create(connection);
// Call the net.example.myinterface.MyMethod
proxy->MyMethod();
// Call the net.example.myinterface.MethodWithArgs D-Bus method
auto result = proxy->MethodWithArgs("My first string",
"My Second String");
std::cout << "Method call result: " << result << std::endl;
// Retrieve the content of the D-Bus object property, which is a string
auto my_property = proxy->GetProperty<std::string>("my_property");
std::cout << "my_property: " << my_property << std::endl;
// Change this property to a new string
std::string new_property_value = "A changed property";
proxy->SetProperty("my_property", new_property_value);
// Retrieve the same property again to show this value did indeed change
std::cout << "modified property: "
<< proxy->GetProperty<std::string>("my_property")
<< std::endl;
return 0;
}
catch (const DBus::Exception &excp)
{
std::cerr << "EXCEPTION CAUGHT: " << excp.what() << std::endl;
return 2;
}
}
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