daemon/src/routing/StaticRoutingExtension.cpp

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/*
 * StaticRoutingExtension.cpp
 *
 *  Created on: 16.02.2010
 *      Author: morgenro
 */

#include "routing/StaticRoutingExtension.h"
#include "routing/QueueBundleEvent.h"
#include "net/TransferAbortedEvent.h"
#include "net/TransferCompletedEvent.h"
#include "routing/RequeueBundleEvent.h"
#include "core/SimpleBundleStorage.h"
#include <typeinfo>

namespace dtn
{
        namespace routing
        {
                StaticRoutingExtension::StaticRoutingExtension(list<StaticRoutingExtension::StaticRoute> routes)
                 : _routes(routes)
                {
                        try {
                                // scan for bundles in the storage
                                dtn::core::SimpleBundleStorage &storage = dynamic_cast<dtn::core::SimpleBundleStorage&>(getRouter()->getStorage());

                                std::list<dtn::data::BundleID> list = storage.getList();

                                for (std::list<dtn::data::BundleID>::const_iterator iter = list.begin(); iter != list.end(); iter++)
                                {
                                        try {
                                                dtn::data::MetaBundle meta( storage.get(*iter) );

                                                // push the bundle into the queue
                                                route( meta );
                                        } catch (dtn::core::BundleStorage::NoBundleFoundException) {
                                                // error, bundle not found!
                                        }
                                }
                        } catch (std::bad_cast ex) {
                                // Another bundle storage is used!
                        }
                }

                StaticRoutingExtension::~StaticRoutingExtension()
                {

                }

                void StaticRoutingExtension::notify(const dtn::core::Event *evt)
                {
                        const QueueBundleEvent *queued = dynamic_cast<const QueueBundleEvent*>(evt);
                        const dtn::net::TransferCompletedEvent *completed = dynamic_cast<const dtn::net::TransferCompletedEvent*>(evt);
                        const dtn::net::TransferAbortedEvent *aborted = dynamic_cast<const dtn::net::TransferAbortedEvent*>(evt);

                        if (queued != NULL)
                        {
                                // try to route this bundle
                                route(queued->bundle);
                        }
                        else if (completed != NULL)
                        {
                                try {
                                        // delete bundle in storage
                                        dtn::core::BundleStorage &storage = getRouter()->getStorage();

                                        storage.remove(completed->getBundle());
                                } catch (dtn::core::BundleStorage::NoBundleFoundException ex) {

                                }
                        }
                        else if (aborted != NULL)
                        {
                                // nothing?
                        }
                }

                void StaticRoutingExtension::route(const dtn::data::MetaBundle &meta)
                {
                        try {
                                // check all routes
                                for (std::list<StaticRoute>::const_iterator iter = _routes.begin(); iter != _routes.end(); iter++)
                                {
                                        StaticRoute route = (*iter);
                                        if ( route.match(meta.destination) )
                                        {
                                                dtn::data::EID target = dtn::data::EID(route.getDestination());

                                                // Yes, make transmit it now!
                                                getRouter()->transferTo( target, meta);
                                                return;
                                        }
                                }
                        } catch (dtn::core::BundleStorage::NoBundleFoundException ex) {
                                // bundle may expired, ignore it.
                        }
                }

                StaticRoutingExtension::StaticRoute::StaticRoute(string route, string dest)
                        : m_route(route), m_dest(dest)
                {
                        // prepare for fast matching
                        size_t splitter = m_route.find_first_of("*");

                        // four types of matching possible
                        // 0. no asterisk exists, do exact matching
                        // 1. asterisk at the begin
                        // 2. asterisk in the middle
                        // 3. asterisk at the end
                        if ( splitter == string::npos )                                 m_matchmode = 0;
                        else if ( splitter == 0 )                                               m_matchmode = 1;
                        else if ( splitter == (m_route.length() -1) )   m_matchmode = 3;
                        else                                                                                    m_matchmode = 2;

                        switch (m_matchmode)
                        {
                                default:

                                break;

                                case 1:
                                        m_route1 = m_route.substr(1);
                                break;

                                case 2:
                                        m_route1 = m_route.substr(0, splitter);
                                        m_route2 = m_route.substr(splitter + 1);
                                break;

                                case 3:
                                        m_route1 = m_route.substr(0, m_route.length() - 1 );
                                break;
                        }
                }

                StaticRoutingExtension::StaticRoute::~StaticRoute()
                {
                }

                bool StaticRoutingExtension::StaticRoute::match(const dtn::data::EID &eid)
                {
                        string dest = eid.getNodeEID();

                        switch (m_matchmode)
                        {
                                default:
                                        // exact matching
                                        if ( dest == m_route ) return true;
                                break;

                                case 3:
                                        // asterisk at the end. the begining must be equal.
                                        if ( dest.find(m_route1, 0) == 0 ) return true;
                                break;

                                case 2:
                                        if (
                                                 ( dest.find(m_route1) == 0 ) &&
                                                 ( dest.rfind(m_route2) == (dest.length() - m_route2.length()) )
                                           )
                                                return true;
                                break;

                                case 1:
                                        // asterisk at begin. the end must be equal.
                                        if ( dest.rfind(m_route1) == (dest.length() - m_route1.length()) ) return true;
                                break;
                        }

                        return false;
                }

                string StaticRoutingExtension::StaticRoute::getDestination()
                {
                        return m_dest;
                }
        }
}

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