daemon/src/net/DiscoveryAgent.cpp

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/*
 * DiscoveryAgent.cpp
 *
 *  Created on: 14.09.2009
 *      Author: morgenro
 */

#include "Configuration.h"
#include "net/DiscoveryAgent.h"
#include "net/DiscoveryService.h"
#include "net/DiscoveryAnnouncement.h"
#include "core/TimeEvent.h"
#include "core/NodeEvent.h"
#include <ibrdtn/utils/Utils.h>
#include <ibrdtn/utils/Clock.h>
#include <ibrcommon/Logger.h>

using namespace dtn::core;

namespace dtn
{
        namespace net
        {
                DiscoveryAgent::DiscoveryAgent(const dtn::daemon::Configuration::Discovery &config)
                 : _config(config), _sn(0), _last_announce_sent(0)
                {
                }

                DiscoveryAgent::~DiscoveryAgent()
                {
                }

                void DiscoveryAgent::addService(std::string name, std::string parameters)
                {
                        DiscoveryService service(name, parameters);
                        _services.push_back(service);
                }

                void DiscoveryAgent::addService(DiscoveryServiceProvider *provider)
                {
                        DiscoveryService service(provider);
                        _services.push_back(service);
                }

                void DiscoveryAgent::received(const DiscoveryAnnouncement &announcement, size_t timeout)
                {
                        // convert the announcement into NodeEvents
                        Node n(announcement.getEID());

                        const std::list<DiscoveryService> services = announcement.getServices();
                        for (std::list<DiscoveryService>::const_iterator iter = services.begin(); iter != services.end(); iter++)
                        {
                                size_t to_value = (timeout == 0) ? _config.timeout() : timeout;

                                const DiscoveryService &s = (*iter);

                                if (s.getName() == "tcpcl")
                                {
                                        n.add(Node::URI(Node::NODE_DISCOVERED, Node::CONN_TCPIP, s.getParameters(), to_value, 20));
                                }
                                else if (s.getName() == "udpcl")
                                {
                                        n.add(Node::URI(Node::NODE_DISCOVERED, Node::CONN_UDPIP, s.getParameters(), to_value, 20));
                                }
                                else if (s.getName() == "lowpancl")
                                {
                                        n.add(Node::URI(Node::NODE_DISCOVERED, Node::CONN_LOWPAN, s.getParameters(), to_value, 20));
                                }
                                else
                                {
                                        n.add(Node::Attribute(Node::NODE_DISCOVERED, s.getName(), s.getParameters(), to_value, 20));
                                }
                        }

                        // create and raise a new event
                        dtn::core::NodeEvent::raise(n, NODE_INFO_UPDATED);

                        // if continuous announcements are disabled, then reply to this message
                        if (!_config.announce())
                        {
                                // first check if another announcement was sent during the same seconds
                                if (_last_announce_sent != dtn::utils::Clock::getTime())
                                {
                                        IBRCOMMON_LOGGER_DEBUG(25) << "reply with discovery announcement" << IBRCOMMON_LOGGER_ENDL;

                                        sendAnnoucement(_sn, _services);

                                        // increment sequencenumber
                                        _sn++;

                                        // save the time of the last sent announcement
                                        _last_announce_sent = dtn::utils::Clock::getTime();
                                }
                        }
                }

                void DiscoveryAgent::timeout()
                {
                        // check if announcements are enabled
                        if (_config.announce())
                        {
                                IBRCOMMON_LOGGER_DEBUG(25) << "send discovery announcement" << IBRCOMMON_LOGGER_ENDL;

                                sendAnnoucement(_sn, _services);

                                // increment sequencenumber
                                _sn++;
                        }
                }
        }
}