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/*
* 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.
*/
#ifndef _UPNPPDISC_H_X_INCLUDED_
#define _UPNPPDISC_H_X_INCLUDED_
#include "Device.hxx"
#include "WorkQueue.hxx"
#include "thread/Mutex.hxx"
#include "util/Error.hxx"
#include <upnp/upnp.h>
#include <map>
#include <vector>
#include <string>
#include <time.h>
class LibUPnP;
class ContentDirectoryService;
/**
* Manage UPnP discovery and maintain a directory of active devices. Singleton.
*
* We are only interested in MediaServers with a ContentDirectory service
* for now, but this could be made more general, by removing the filtering.
*/
class UPnPDeviceDirectory {
/**
* Each appropriate discovery event (executing in a libupnp thread
* context) queues the following task object for processing by the
* discovery thread.
*/
struct DiscoveredTask {
std::string url;
std::string deviceId;
int expires; // Seconds valid
DiscoveredTask(const Upnp_Discovery *disco)
:url(disco->Location),
deviceId(disco->DeviceId),
expires(disco->Expires) {}
};
/**
* Descriptor for one device having a Content Directory
* service found on the network.
*/
class ContentDirectoryDescriptor {
public:
UPnPDevice device;
time_t last_seen;
int expires; // seconds valid
ContentDirectoryDescriptor() = default;
ContentDirectoryDescriptor(time_t last, int exp)
:last_seen(last), expires(exp+20) {}
bool Parse(const std::string &url, const char *description,
Error &_error) {
return device.Parse(url, description, _error);
}
};
LibUPnP *const lib;
Error error;
Mutex mutex;
std::map<std::string, ContentDirectoryDescriptor> directories;
WorkQueue<DiscoveredTask *> discoveredQueue;
/**
* The UPnP device search timeout, which should actually be
* called delay because it's the base of a random delay that
* the devices apply to avoid responding all at the same time.
*/
int m_searchTimeout;
time_t m_lastSearch;
public:
UPnPDeviceDirectory(LibUPnP *_lib);
UPnPDeviceDirectory(const UPnPDeviceDirectory &) = delete;
UPnPDeviceDirectory& operator=(const UPnPDeviceDirectory &) = delete;
/** Retrieve the directory services currently seen on the network */
bool getDirServices(std::vector<ContentDirectoryService> &);
/**
* Get server by friendly name. It's a bit wasteful to copy
* all servers for this, we could directly walk the list. Otoh
* there isn't going to be millions...
*/
bool getServer(const char *friendlyName,
ContentDirectoryService &server);
/** My health */
bool ok() const {
return !error.IsDefined();
}
/** My diagnostic if health is bad */
const Error &GetError() const {
return error;
}
private:
bool search();
/**
* Look at the devices and get rid of those which have not
* been seen for too long. We do this when listing the top
* directory.
*/
void expireDevices();
/**
* Worker routine for the discovery queue. Get messages about
* devices appearing and disappearing, and update the
* directory pool accordingly.
*/
static void *discoExplorer(void *);
void discoExplorer();
int OnAlive(Upnp_Discovery *disco);
int OnByeBye(Upnp_Discovery *disco);
int cluCallBack(Upnp_EventType et, void *evp);
};
#endif /* _UPNPPDISC_H_X_INCLUDED_ */
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