daemon/src/net/ConnectionManager.cpp

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/*
 * ConnectionManager.cpp
 *
 *  Created on: 24.09.2009
 *      Author: morgenro
 */

#include "net/ConnectionManager.h"
#include "net/UDPConvergenceLayer.h"
#include "net/TCPConvergenceLayer.h"
#include "net/BundleReceivedEvent.h"
#include "core/NodeEvent.h"
#include "core/BundleEvent.h"
#include "ibrcommon/net/tcpserver.h"
#include "core/BundleCore.h"
#include "routing/RequeueBundleEvent.h"
#include "net/ConnectionEvent.h"

#include "core/NodeEvent.h"
#include "core/TimeEvent.h"

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <typeinfo>
#include <ibrcommon/Logger.h>

using namespace dtn::core;

namespace dtn
{
        namespace net
        {
                struct CompareNodeDestination:
                public std::binary_function< dtn::core::Node, dtn::data::EID, bool > {
                        bool operator() ( const dtn::core::Node &node, const dtn::data::EID &destination ) const {
                                return dtn::data::EID(node.getURI()) == destination;
                        }
                };

                ConnectionManager::ConnectionManager()
                 : _shutdown(false)
                {
                }

                ConnectionManager::~ConnectionManager()
                {
                }

                void ConnectionManager::componentUp()
                {
                        bindEvent(TimeEvent::className);
                        bindEvent(NodeEvent::className);
                        bindEvent(ConnectionEvent::className);
                }

                void ConnectionManager::componentDown()
                {
                        {
                                ibrcommon::MutexLock l(_cl_lock);
                                // clear the list of convergence layers
                                _cl.clear();
                        }

                        unbindEvent(NodeEvent::className);
                        unbindEvent(TimeEvent::className);
                        unbindEvent(ConnectionEvent::className);
                }

                void ConnectionManager::raiseEvent(const dtn::core::Event *evt)
                {
                        try {
                                const NodeEvent &nodeevent = dynamic_cast<const NodeEvent&>(*evt);
                                const Node &n = nodeevent.getNode();

                                switch (nodeevent.getAction())
                                {
                                        case NODE_INFO_UPDATED:
                                                discovered(n);
                                                break;

                                        case NODE_AVAILABLE:
                                                if (n.doConnectImmediately())
                                                {
                                                        // open the connection immediately
                                                        open(n);
                                                }
                                                break;

                                        default:
                                                break;
                                }
                        } catch (const std::bad_cast&) { }

                        try {
                                const TimeEvent &timeevent = dynamic_cast<const TimeEvent&>(*evt);

                                if (timeevent.getAction() == TIME_SECOND_TICK)
                                {
                                        check_discovered();
                                }
                        } catch (const std::bad_cast&) { }

                        try {
                                const ConnectionEvent &connection = dynamic_cast<const ConnectionEvent&>(*evt);

                                switch (connection.state)
                                {
                                        case ConnectionEvent::CONNECTION_UP:
                                        {
                                                ibrcommon::MutexLock l(_node_lock);

                                                // if this node was unknown before...
                                                if (!isNeighbor(connection.node))
                                                {
                                                        // announce the new node
                                                        dtn::core::NodeEvent::raise(connection.node, dtn::core::NODE_AVAILABLE);
                                                }

                                                _connected_nodes.insert(connection.node);
                                                break;
                                        }

                                        case ConnectionEvent::CONNECTION_DOWN:
                                        {
                                                ibrcommon::MutexLock l(_node_lock);

                                                // if this node is still available (discovered or static)
                                                if (isNeighbor(connection.node))
                                                {
                                                        // remove the node from the connected list
                                                        _connected_nodes.erase(connection.node);

                                                        // remove the node from the discovered list
                                                        _discovered_nodes.erase(connection.node);

                                                        // if the node is unknown now ...
                                                        if (!isNeighbor(connection.node))
                                                        {
                                                                // announce the unavailable event
                                                                dtn::core::NodeEvent::raise(connection.node, dtn::core::NODE_UNAVAILABLE);
                                                        }
                                                }
                                                break;
                                        }

                                        default:
                                                break;
                                }

                        } catch (const std::bad_cast&) {

                        }
                }

                void ConnectionManager::addConnection(const dtn::core::Node &n)
                {
                        ibrcommon::MutexLock l(_node_lock);
                        _static_nodes.insert(n);
                        dtn::core::NodeEvent::raise(n, dtn::core::NODE_AVAILABLE);
                }

                void ConnectionManager::addConvergenceLayer(ConvergenceLayer *cl)
                {
                        ibrcommon::MutexLock l(_cl_lock);
                        _cl.insert( cl );
                }

                void ConnectionManager::discovered(const dtn::core::Node &node)
                {
                        // ignore messages of ourself
                        if (EID(node.getURI()) == dtn::core::BundleCore::local) return;

                        ibrcommon::MutexLock l(_node_lock);

                        // if this node was unknown before...
                        if (!isNeighbor(node))
                        {
                                // announce the new node
                                dtn::core::NodeEvent::raise(node, dtn::core::NODE_AVAILABLE);
                        }

                        _discovered_nodes.erase(node);
                        _discovered_nodes.insert(node);
                }

                void ConnectionManager::check_discovered()
                {
                        ibrcommon::MutexLock l(_node_lock);

                        // search for outdated nodes
                        std::set<dtn::core::Node>::iterator iter = _discovered_nodes.begin();

                        while (iter != _discovered_nodes.end())
                        {
                                dtn::core::Node n = (*iter);

                                // node is outdated -> remove it
                                _discovered_nodes.erase( iter++ );

                                if ( !n.decrementTimeout(1) )
                                {
                                        // remove the connected node
                                        _connected_nodes.erase(n);

                                        // announce the unavailable event
                                        dtn::core::NodeEvent::raise(n, dtn::core::NODE_UNAVAILABLE);
                                }
                                else
                                {
                                        _discovered_nodes.insert(n);
                                }
                        }
                }

                void ConnectionManager::open(const dtn::core::Node &node)
                {
                        if ((node.getProtocol() == Node::CONN_UNDEFINED) || (node.getProtocol() == Node::CONN_UNSUPPORTED))
                                throw ConnectionNotAvailableException();

                        ibrcommon::MutexLock l(_cl_lock);

                        // search for the right cl
                        for (std::set<ConvergenceLayer*>::iterator iter = _cl.begin(); iter != _cl.end(); iter++)
                        {
                                ConvergenceLayer *cl = (*iter);
                                if (node.getProtocol() == cl->getDiscoveryProtocol())
                                {
                                        cl->open(node);

                                        // stop here, we queued the bundle already
                                        return;
                                }
                        }

                        throw ConnectionNotAvailableException();
                }

                void ConnectionManager::queue(const dtn::core::Node &node, const ConvergenceLayer::Job &job)
                {
                        if ((node.getProtocol() == Node::CONN_UNDEFINED) || (node.getProtocol() == Node::CONN_UNSUPPORTED))
                                throw ConnectionNotAvailableException();

                        ibrcommon::MutexLock l(_cl_lock);

                        // search for the right cl
                        for (std::set<ConvergenceLayer*>::iterator iter = _cl.begin(); iter != _cl.end(); iter++)
                        {
                                ConvergenceLayer *cl = (*iter);
                                if (node.getProtocol() == cl->getDiscoveryProtocol())
                                {
                                        cl->queue(node, job);

                                        // stop here, we queued the bundle already
                                        return;
                                }
                        }

                        throw ConnectionNotAvailableException();
                }

                void ConnectionManager::queue(const ConvergenceLayer::Job &job)
                {
                        try {
                                ibrcommon::MutexLock l(_node_lock);

                                // create a match rank list
                                std::list<dtn::core::Node> match_rank;

                                // we prefer TCP as primary connection type
                                match_rank.push_back(dtn::core::Node(job._destination, Node::CONN_TCPIP));

                                // use UDP as seconds connection type
                                match_rank.push_back(dtn::core::Node(job._destination, Node::CONN_UDPIP));

                                // use Bluetooth as fourth connection type
                                match_rank.push_back(dtn::core::Node(job._destination, Node::CONN_BLUETOOTH));

                                // use ZigBee as fifth connection type
                                match_rank.push_back(dtn::core::Node(job._destination, Node::CONN_ZIGBEE));

                                // use HTTP as sixth connection type
                                match_rank.push_back(dtn::core::Node(job._destination, Node::CONN_HTTP));

                                if (IBRCOMMON_LOGGER_LEVEL >= 50)
                                {
                                        IBRCOMMON_LOGGER_DEBUG(50) << "## static node list ##" << IBRCOMMON_LOGGER_ENDL;
                                        for (std::set<dtn::core::Node>::const_iterator iter = _static_nodes.begin(); iter != _static_nodes.end(); iter++)
                                        {
                                                const dtn::core::Node &n = (*iter);
                                                IBRCOMMON_LOGGER_DEBUG(50) << n.toString() << IBRCOMMON_LOGGER_ENDL;
                                        }
                                }

                                if (IBRCOMMON_LOGGER_LEVEL >= 50)
                                {
                                        IBRCOMMON_LOGGER_DEBUG(50) << "## dynamic node list ##" << IBRCOMMON_LOGGER_ENDL;
                                        for (std::set<dtn::core::Node>::const_iterator iter = _discovered_nodes.begin(); iter != _discovered_nodes.end(); iter++)
                                        {
                                                const dtn::core::Node &n = (*iter);
                                                IBRCOMMON_LOGGER_DEBUG(50) << n.toString() << IBRCOMMON_LOGGER_ENDL;
                                        }
                                }

                                if (IBRCOMMON_LOGGER_LEVEL >= 50)
                                {
                                        IBRCOMMON_LOGGER_DEBUG(50) << "## connected node list ##" << IBRCOMMON_LOGGER_ENDL;
                                        for (std::set<dtn::core::Node>::const_iterator iter = _connected_nodes.begin(); iter != _connected_nodes.end(); iter++)
                                        {
                                                const dtn::core::Node &n = (*iter);
                                                IBRCOMMON_LOGGER_DEBUG(50) << n.toString() << IBRCOMMON_LOGGER_ENDL;
                                        }
                                }

                                // iterate through all matches in the rank list
                                for (std::list<dtn::core::Node>::const_iterator imatch = match_rank.begin(); imatch != match_rank.end(); imatch++)
                                {
                                        const dtn::core::Node &match = (*imatch);
                                        IBRCOMMON_LOGGER_DEBUG(50) << "match for " << match.toString() << IBRCOMMON_LOGGER_ENDL;

                                        try {
                                                // queue to a static node
                                                std::set<dtn::core::Node>::const_iterator iter = _static_nodes.find(match);

                                                if (iter != _static_nodes.end())
                                                {
                                                        throw (*iter);
                                                }
                                        } catch (const std::exception&) { }

                                        try {
                                                // queue to a dynamic discovered node
                                                std::set<dtn::core::Node>::const_iterator iter = _discovered_nodes.find(match);

                                                if (iter != _discovered_nodes.end())
                                                {
                                                        throw (*iter);
                                                }
                                        } catch (const std::exception&) { }

                                        try {
                                                // queue to a connected node
                                                std::set<dtn::core::Node>::const_iterator iter = _connected_nodes.find(match);

                                                if (iter != _connected_nodes.end())
                                                {
                                                        throw (*iter);
                                                }
                                        } catch (const std::exception&) { }
                                }
                        } catch (const dtn::core::Node next) {
                                IBRCOMMON_LOGGER_DEBUG(50) << "next hop: " << next.toString() << IBRCOMMON_LOGGER_ENDL;
                                queue(next, job);
                                return;
                        }

                        throw NeighborNotAvailableException("No active connection to this neighbor available!");
                }

                void ConnectionManager::queue(const dtn::data::EID &eid, const dtn::data::BundleID &b)
                {
                        queue( ConvergenceLayer::Job(eid, b) );
                }

                const std::set<dtn::core::Node> ConnectionManager::getNeighbors()
                {
                        ibrcommon::MutexLock l(_node_lock);

                        std::set<dtn::core::Node> _nodes;

                        for (std::set<dtn::core::Node>::const_iterator iter = _static_nodes.begin(); iter != _static_nodes.end(); iter++)
                        {
                                _nodes.insert( *iter );
                        }

                        for (std::set<dtn::core::Node>::const_iterator iter = _discovered_nodes.begin(); iter != _discovered_nodes.end(); iter++)
                        {
                                _nodes.insert( *iter );
                        }

                        for (std::set<dtn::core::Node>::const_iterator iter = _connected_nodes.begin(); iter != _connected_nodes.end(); iter++)
                        {
                                _nodes.insert( *iter );
                        }

                        return _nodes;
                }


                bool ConnectionManager::isNeighbor(const dtn::core::Node &node)
                {
                        // search for the node in all sets
                        if (_static_nodes.find(node) != _static_nodes.end())
                        {
                                return true;
                        }

                        if (_discovered_nodes.find(node) != _discovered_nodes.end())
                        {
                                return true;
                        }

                        if (_connected_nodes.find(node) != _connected_nodes.end())
                        {
                                return true;
                        }

                        return false;
                }

                const std::string ConnectionManager::getName() const
                {
                        return "ConnectionManager";
                }
        }
}