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/* Copyright (C) 2011 The giomm Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* This is a basic server providing a clock like functionality. Clients can
* get the current time, set the alarm and get notified when the alarm time is
* reached. It is basic because there is only one global alarm which any
* client can set. Clients listening for the alarm signal will be notified by
* use of the global alarm signal. The server should be easily modifiable to
* allow per-client alarms, but that is left as an exercise.
*
* Along with the above it provides a method to get its stdout's file
* descriptor to test the Gio::DBus::Message API.
*/
#include <giomm.h>
#include <glibmm.h>
#include <iostream>
namespace
{
static Glib::RefPtr<Gio::DBus::NodeInfo> introspection_data;
static Glib::ustring introspection_xml =
"<node>"
" <interface name='org.glibmm.DBusExample.Clock'>"
" <method name='GetTime'>"
" <arg type='s' name='iso8601' direction='out'/>"
" </method>"
" <method name='SetAlarm'>"
" <arg type='s' name='iso8601' direction='in'/>"
" </method>"
" </interface>"
"</node>";
guint registered_id = 0;
// Stores the current alarm.
static Glib::TimeVal curr_alarm;
} // anonymous namespace
static void on_method_call(const Glib::RefPtr<Gio::DBus::Connection>& /* connection */,
const Glib::ustring& /* sender */, const Glib::ustring& /* object_path */,
const Glib::ustring& /* interface_name */, const Glib::ustring& method_name,
const Glib::VariantContainerBase& parameters,
const Glib::RefPtr<Gio::DBus::MethodInvocation>& invocation)
{
if(method_name == "GetTime")
{
Glib::TimeVal curr_time;
curr_time.assign_current_time();
const Glib::ustring time_str = curr_time.as_iso8601();
const auto time_var =
Glib::Variant<Glib::ustring>::create(time_str);
// Create the tuple.
Glib::VariantContainerBase response =
Glib::VariantContainerBase::create_tuple(time_var);
// Return the tuple with the included time.
invocation->return_value(response);
}
else if(method_name == "SetAlarm")
{
// Get the parameter tuple.
//Glib::VariantContainerBase parameters;
//invocation->get_parameters(parameters);
// Get the variant string.
Glib::Variant<Glib::ustring> param;
parameters.get_child(param);
// Get the time string.
const Glib::ustring time_str = param.get();
if(!curr_alarm.assign_from_iso8601(time_str))
{
// If setting alarm was not successful, return an error.
Gio::DBus::Error error(Gio::DBus::Error::INVALID_ARGS,
"Alarm string is not in ISO8601 format.");
invocation->return_error(error);
}
}
else
{
// Non-existent method on the interface.
Gio::DBus::Error error(Gio::DBus::Error::UNKNOWN_METHOD,
"Method does not exist.");
invocation->return_error(error);
}
}
//This must be a global instance. See the InterfaceVTable documentation.
//TODO: Make that unnecessary.
const Gio::DBus::InterfaceVTable interface_vtable(sigc::ptr_fun(&on_method_call));
void on_bus_acquired(const Glib::RefPtr<Gio::DBus::Connection>& connection, const Glib::ustring& /* name */)
{
// Export an object to the bus:
// See https://bugzilla.gnome.org/show_bug.cgi?id=646417 about avoiding
// the repetition of the interface name:
try
{
registered_id = connection->register_object("/org/glibmm/DBus/TestObject",
introspection_data->lookup_interface(),
interface_vtable);
}
catch(const Glib::Error& ex)
{
std::cerr << "Registration of object failed." << std::endl;
}
return;
}
void on_name_acquired(const Glib::RefPtr<Gio::DBus::Connection>& /* connection */, const Glib::ustring& /* name */)
{
//TODO: What is this good for? See https://bugzilla.gnome.org/show_bug.cgi?id=646427
}
void on_name_lost(const Glib::RefPtr<Gio::DBus::Connection>& connection, const Glib::ustring& /* name */)
{
connection->unregister_object(registered_id);
}
int main(int, char**)
{
std::locale::global(std::locale(""));
Gio::init();
try
{
introspection_data = Gio::DBus::NodeInfo::create_for_xml(introspection_xml);
}
catch(const Glib::Error& ex)
{
std::cerr << "Unable to create introspection data: " << ex.what() <<
"." << std::endl;
return 1;
}
const auto id = Gio::DBus::own_name(Gio::DBus::BUS_TYPE_SESSION,
"org.glibmm.DBusExample",
sigc::ptr_fun(&on_bus_acquired),
sigc::ptr_fun(&on_name_acquired),
sigc::ptr_fun(&on_name_lost));
//Keep the service running until the process is killed:
auto loop = Glib::MainLoop::create();
loop->run();
Gio::DBus::unown_name(id);
return EXIT_SUCCESS;
}
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