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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.DBus.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>";
// Stores the current alarm.
static Glib::TimeVal curr_alarm;
// This variable is used to keep an incoming connection active until it is
// closed.
static Glib::RefPtr<Gio::DBus::Connection> current_connection;
} // 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));
bool on_server_new_connection(const Glib::RefPtr<Gio::DBus::Connection>& connection)
{
auto credentials =
connection->get_peer_credentials();
std::string credentials_str;
if(!credentials)
credentials_str = "(no credentials received)";
else
credentials_str = credentials->to_string();
std::cout <<
"Client connected." << std::endl <<
"Peer credentials: " << credentials_str << std::endl <<
"Negotiated capabilities: unix-fd-passing=" << (connection->get_capabilities() & Gio::DBus::CAPABILITY_FLAGS_UNIX_FD_PASSING) << std::endl;
// If there is already an active connection, do not accept this new one.
// There may be a better way to decide how to keep current incoming
// connections.
if(current_connection && !current_connection->is_closed())
{
std::cerr << "Unable to accept a new incoming connection because one is "
"already active." << std::endl;
return false;
}
// In order for the connection to stay active the reference to the
// connection must be kept, so store the connection in a global variable:
current_connection = connection;
// See https://bugzilla.gnome.org/show_bug.cgi?id=646417 about avoiding
// the repetition of the interface name:
try
{
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 false;
}
return true;
}
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;
}
Glib::RefPtr<Gio::DBus::Server> server;
const Glib::ustring address = "unix:abstract=myadd";
try
{
server = Gio::DBus::Server::create_sync(address,
Gio::DBus::generate_guid());
}
catch(const Glib::Error& ex)
{
std::cerr << "Error creating server at address: " << address <<
": " << ex.what() << "." << std::endl;
return EXIT_FAILURE;
}
server->start();
std::cout << "Server is listening at: " << server->get_client_address() <<
"." << std::endl;
server->signal_new_connection().connect(sigc::ptr_fun(&on_server_new_connection));
//Keep the server running until the process is killed:
auto loop = Glib::MainLoop::create();
loop->run();
return EXIT_SUCCESS;
}
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