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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-service.cpp
*
* @brief Simple example service.
* This example code is referenced to from the README.md document.
*
* 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-service example-service.cpp
*
*/
#include <iostream>
#include <string>
#include <gdbuspp/service.hpp>
#include <gdbuspp/glib2/utils.hpp>
class MySignalGroup : public DBus::Signals::Group
{
public:
using Ptr = std::shared_ptr<MySignalGroup>;
MySignalGroup(DBus::Connection::Ptr connection)
: DBus::Signals::Group(connection,
"/example/myobject",
"net.example.myinterface")
{
RegisterSignal("MySignal",
{{"message", glib2::DataType::DBus<std::string>()}});
}
void MySignal(const std::string &message_content)
{
// NOTE: D-Bus signals are picky on the data type. Signals
// must always be sent as a tuple, even if it's just a single value
GVariant *message = glib2::Value::CreateTupleWrapped(message_content);
SendGVariant("MySignal", message);
}
};
class MyObject : public DBus::Object::Base
{
public:
MyObject(DBus::Connection::Ptr connection, DBus::Object::Manager::Ptr obj_mgr)
: DBus::Object::Base("/example/myobject",
"net.example.myinterface"),
object_manager(obj_mgr)
{
// Declaring D-Bus methods
AddMethod("MyMethod",
[](DBus::Object::Method::Arguments::Ptr args)
{
// Code performed on access
std::cout << "MyMethod called: " << args << std::endl;
// We have no data to return; so we return nullptr
args->SetMethodReturn(nullptr);
});
auto args = AddMethod("MethodWithArgs",
[](DBus::Object::Method::Arguments::Ptr args)
{
// Extract input arguments
GVariant *params = args->GetMethodParameters();
std::string string1 = glib2::Value::Extract<std::string>(params, 0);
std::string string2 = glib2::Value::Extract<std::string>(params, 1);
// Prepare the response to the caller
std::string result = string1 + " <=> " + string2;
GVariant *ret = glib2::Value::CreateTupleWrapped(result);
args->SetMethodReturn(ret);
});
args->AddInput("string_1", glib2::DataType::DBus<std::string>());
args->AddInput("string_2", glib2::DataType::DBus<std::string>());
args->AddOutput("result", glib2::DataType::DBus<std::string>());
// Declaring a D-Bus property
bool readwrite = true;
AddProperty("my_property", my_property, readwrite);
// Declaring a D-Bus signal
my_signals = DBus::Signals::Group::Create<MySignalGroup>(connection);
my_signals->AddTarget("");
RegisterSignals(my_signals);
}
const bool Authorize(const DBus::Authz::Request::Ptr request) override
{
// code to authorize a D-Bus proxy client accessing this object
// Send a simple D-Bus signal whenever this is called
my_signals->MySignal("Authorize called");
// By returning 'true', access is granted
return true;
}
private:
DBus::Object::Manager::Ptr object_manager = nullptr;
std::string my_property{"My Initial Value"};
MySignalGroup::Ptr my_signals = nullptr;
};
class MyService : public DBus::Service
{
public:
MyService(DBus::Connection::Ptr con)
: DBus::Service(con, "net.example.myservice")
{
}
void BusNameAcquired(const std::string &busname) override
{
// Code run when the name of your service is accepted
std::cout << "Service registered: " << busname << std::endl;
}
void BusNameLost(const std::string &busname) override
{
// Code run when your service could not get or keep the bus name
std::cout << "Could not acquire the bus name: " << busname << std::endl;
// Here we just stop and exit the service
DBus::Service::Stop();
}
};
int main(int argc, char **argv)
{
try
{
// Prepare a connection to the Session D-Bus
auto connection = DBus::Connection::Create(DBus::BusType::SESSION);
// Instantiate and prepare the D-Bus service provided
// via the MyService class
auto my_service = DBus::Service::Create<MyService>(connection);
// Get access to the DBus::Object::Manager object
auto object_manager = my_service->GetObjectManager();
// Add the service root object
my_service->CreateServiceHandler<MyObject>(connection, object_manager);
// Start the service
my_service->Run();
return 0;
}
catch (const DBus::Exception &excp)
{
std::cerr << "EXCEPTION CAUGHT: " << excp.what() << std::endl;
return 2;
}
}
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