path: root/src/lib/upnp/ClientInit.cxx

/*
 * Copyright (C) 2003-2014 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "ClientInit.hxx"
#include "Init.hxx"
#include "Callback.hxx"
#include "Domain.hxx"
#include "thread/Mutex.hxx"
#include "util/Error.hxx"

#include <upnp/upnptools.h>

static Mutex upnp_client_init_mutex;
static unsigned upnp_client_ref;
static UpnpClient_Handle upnp_client_handle;

static int
UpnpClientCallback(Upnp_EventType et, void *evp, void *cookie)
{
	if (cookie == nullptr)
		/* this is the cookie passed to UpnpRegisterClient();
		   but can this ever happen?  Will libupnp ever invoke
		   the registered callback without that cookie? */
		return UPNP_E_SUCCESS;

	UpnpCallback &callback = UpnpCallback::FromUpnpCookie(cookie);
	return callback.Invoke(et, evp);
}

static bool
DoInit(Error &error)
{
	auto code = UpnpRegisterClient(UpnpClientCallback, nullptr,
				       &upnp_client_handle);
	if (code != UPNP_E_SUCCESS) {
		error.Format(upnp_domain, code,
			     "UpnpRegisterClient() failed: %s",
			     UpnpGetErrorMessage(code));
		return false;
	}

	return true;
}

bool
UpnpClientGlobalInit(UpnpClient_Handle &handle, Error &error)
{
	if (!UpnpGlobalInit(error))
		return false;

	upnp_client_init_mutex.lock();
	bool success = upnp_client_ref > 0 || DoInit(error);
	upnp_client_init_mutex.unlock();

	if (success) {
		++upnp_client_ref;
		handle = upnp_client_handle;
	} else
		UpnpGlobalFinish();

	return success;
}

void
UpnpClientGlobalFinish()
{
	upnp_client_init_mutex.lock();

	assert(upnp_client_ref > 0);
	if (--upnp_client_ref == 0)
		UpnpUnRegisterClient(upnp_client_handle);

	upnp_client_init_mutex.unlock();

	UpnpGlobalFinish();
}