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/*
* 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 Library 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.
*
* AvahiDiscoveryAgent.h
* The Avahi implementation of DiscoveryAgentInterface.
* Copyright (C) 2013 Simon Newton
*/
#ifndef OLAD_AVAHIDISCOVERYAGENT_H_
#define OLAD_AVAHIDISCOVERYAGENT_H_
#include <avahi-client/client.h>
#include <avahi-common/thread-watch.h>
#include <avahi-client/publish.h>
#include <ola/base/Macro.h>
#include <ola/util/Backoff.h>
#include <map>
#include <string>
#include <vector>
#include "olad/DiscoveryAgent.h"
namespace ola {
/**
* @brief An implementation of DiscoveryAgentInterface that uses the Avahi
* client library.
*/
class AvahiDiscoveryAgent : public DiscoveryAgentInterface {
public:
AvahiDiscoveryAgent();
~AvahiDiscoveryAgent();
bool Init();
void RegisterService(const std::string &service_name,
const std::string &type,
uint16_t port,
const RegisterOptions &options);
/**
* @brief Called when the Avahi client state changes
*/
void ClientStateChanged(AvahiClientState state, AvahiClient *client);
/**
* @brief Called when a entry group state changes.
*/
void GroupStateChanged(const std::string &service_key,
AvahiEntryGroup *group,
AvahiEntryGroupState state);
/**
* @brief Called when the reconnect timeout expires.
*/
void ReconnectTimeout();
private:
// The structure used to track services.
struct ServiceEntry : public RegisterOptions {
public:
const std::string service_name;
// This may differ from the service name if there was a collision.
std::string actual_service_name;
const uint16_t port;
AvahiEntryGroup *group;
AvahiEntryGroupState state;
struct EntryGroupParams *params;
ServiceEntry(const std::string &service_name,
const std::string &type_spec,
uint16_t port,
const RegisterOptions &options);
std::string key() const;
const std::string &type() const { return m_type; }
const std::vector<std::string> sub_types() const { return m_sub_types; }
private:
std::string m_type_spec; // type[,subtype]
std::string m_type;
std::vector<std::string> m_sub_types;
};
typedef std::map<std::string, ServiceEntry*> Services;
AvahiThreadedPoll *m_threaded_poll;
AvahiClient *m_client;
AvahiTimeout *m_reconnect_timeout;
Services m_services;
BackoffGenerator m_backoff;
bool InternalRegisterService(ServiceEntry *service);
void CreateNewClient();
void UpdateServices();
void DeregisterAllServices();
void SetUpReconnectTimeout();
bool RenameAndRegister(ServiceEntry *service);
static std::string ClientStateToString(AvahiClientState state);
static std::string GroupStateToString(AvahiEntryGroupState state);
DISALLOW_COPY_AND_ASSIGN(AvahiDiscoveryAgent);
};
} // namespace ola
#endif // OLAD_AVAHIDISCOVERYAGENT_H_
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