daemon/src/routing/epidemic/EpidemicRoutingExtension.cpp

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/*
 * EpidemicRoutingExtension.cpp
 *
 *  Created on: 18.02.2010
 *      Author: morgenro
 */

#include "routing/epidemic/EpidemicRoutingExtension.h"

#include "routing/QueueBundleEvent.h"
#include "routing/NodeHandshakeEvent.h"
#include "net/TransferCompletedEvent.h"
#include "net/TransferAbortedEvent.h"
#include "core/NodeEvent.h"
#include "core/TimeEvent.h"
#include "core/Node.h"
#include "net/ConnectionManager.h"
#include "Configuration.h"
#include "core/BundleCore.h"
#include "core/BundleEvent.h"

#include <ibrdtn/data/MetaBundle.h>
#include <ibrcommon/thread/MutexLock.h>
#include <ibrcommon/Logger.h>

#include <functional>
#include <list>
#include <algorithm>

#include <iomanip>
#include <ios>
#include <iostream>
#include <set>
#include <memory>

#include <stdlib.h>
#include <typeinfo>

namespace dtn
{
        namespace routing
        {
                EpidemicRoutingExtension::EpidemicRoutingExtension()
                {
                        // write something to the syslog
                        IBRCOMMON_LOGGER(info) << "Initializing epidemic routing module" << IBRCOMMON_LOGGER_ENDL;
                }

                EpidemicRoutingExtension::~EpidemicRoutingExtension()
                {
                        stop();
                        join();
                }

                void EpidemicRoutingExtension::requestHandshake(const dtn::data::EID&, NodeHandshake &request) const
                {
                        request.addRequest(BloomFilterSummaryVector::identifier);
                }

                void EpidemicRoutingExtension::notify(const dtn::core::Event *evt)
                {
                        // If an incoming bundle is received, forward it to all connected neighbors
                        try {
                                dynamic_cast<const QueueBundleEvent&>(*evt);

                                // new bundles trigger a recheck for all neighbors
                                const std::set<dtn::core::Node> nl = dtn::core::BundleCore::getInstance().getNeighbors();

                                for (std::set<dtn::core::Node>::const_iterator iter = nl.begin(); iter != nl.end(); iter++)
                                {
                                        const dtn::core::Node &n = (*iter);

                                        // transfer the next bundle to this destination
                                        _taskqueue.push( new SearchNextBundleTask( n.getEID() ) );
                                }
                                return;
                        } catch (const std::bad_cast&) { };

                        // If a new neighbor comes available search for bundles
                        try {
                                const dtn::core::NodeEvent &nodeevent = dynamic_cast<const dtn::core::NodeEvent&>(*evt);
                                const dtn::core::Node &n = nodeevent.getNode();

                                if (nodeevent.getAction() == NODE_AVAILABLE)
                                {
                                        _taskqueue.push( new SearchNextBundleTask( n.getEID() ) );
                                }

                                return;
                        } catch (const std::bad_cast&) { };

                        try {
                                const NodeHandshakeEvent &handshake = dynamic_cast<const NodeHandshakeEvent&>(*evt);

                                if (handshake.state == NodeHandshakeEvent::HANDSHAKE_UPDATED)
                                {
                                        // transfer the next bundle to this destination
                                        _taskqueue.push( new SearchNextBundleTask( handshake.peer ) );
                                }
                                else if (handshake.state == NodeHandshakeEvent::HANDSHAKE_COMPLETED)
                                {
                                        // transfer the next bundle to this destination
                                        _taskqueue.push( new SearchNextBundleTask( handshake.peer ) );
                                }
                                return;
                        } catch (const std::bad_cast&) { };

                        // The bundle transfer has been aborted
                        try {
                                const dtn::net::TransferAbortedEvent &aborted = dynamic_cast<const dtn::net::TransferAbortedEvent&>(*evt);

                                // transfer the next bundle to this destination
                                _taskqueue.push( new SearchNextBundleTask( aborted.getPeer() ) );

                                return;
                        } catch (const std::bad_cast&) { };

                        // A bundle transfer was successful
                        try {
                                const dtn::net::TransferCompletedEvent &completed = dynamic_cast<const dtn::net::TransferCompletedEvent&>(*evt);

                                // transfer the next bundle to this destination
                                _taskqueue.push( new SearchNextBundleTask( completed.getPeer() ) );
                                return;
                        } catch (const std::bad_cast&) { };
                }

                void EpidemicRoutingExtension::__cancellation()
                {
                        _taskqueue.abort();
                }

                void EpidemicRoutingExtension::run()
                {
                        class BundleFilter : public dtn::storage::BundleStorage::BundleFilterCallback
                        {
                        public:
                                BundleFilter(const NeighborDatabase::NeighborEntry &entry)
                                 : _entry(entry)
                                {};

                                virtual ~BundleFilter() {};

                                virtual size_t limit() const { return 10; };

                                virtual bool shouldAdd(const dtn::data::MetaBundle &meta) const
                                {
                                        // check Scope Control Block - do not forward bundles with hop limit == 0
                                        if (meta.hopcount == 0)
                                        {
                                                return false;
                                        }

                                        // do not forward any routing control message
                                        // this is done by the neighbor routing module
                                        if (isRouting(meta.source))
                                        {
                                                return false;
                                        }

                                        // do not forward local bundles
                                        if ((meta.destination.getNode() == dtn::core::BundleCore::local)
                                                        && meta.get(dtn::data::PrimaryBlock::DESTINATION_IS_SINGLETON)
                                                )
                                        {
                                                return false;
                                        }

                                        // check Scope Control Block - do not forward non-group bundles with hop limit <= 1
                                        if ((meta.hopcount <= 1) && (meta.get(dtn::data::PrimaryBlock::DESTINATION_IS_SINGLETON)))
                                        {
                                                return false;
                                        }

                                        // do not forward to any blacklisted destination
                                        const dtn::data::EID dest = meta.destination.getNode();
                                        if (_blacklist.find(dest) != _blacklist.end())
                                        {
                                                return false;
                                        }

                                        // do not forward bundles already known by the destination
                                        // throws BloomfilterNotAvailableException if no filter is available or it is expired
                                        if (_entry.has(meta, true))
                                        {
                                                return false;
                                        }

                                        return true;
                                };

                                void blacklist(const dtn::data::EID& id)
                                {
                                        _blacklist.insert(id);
                                };

                        private:
                                std::set<dtn::data::EID> _blacklist;
                                const NeighborDatabase::NeighborEntry &_entry;
                        };

                        dtn::storage::BundleStorage &storage = (**this).getStorage();

                        while (true)
                        {
                                try {
                                        Task *t = _taskqueue.getnpop(true);
                                        std::auto_ptr<Task> killer(t);

                                        IBRCOMMON_LOGGER_DEBUG(50) << "processing epidemic task " << t->toString() << IBRCOMMON_LOGGER_ENDL;

                                        try {
                                                try {
                                                        SearchNextBundleTask &task = dynamic_cast<SearchNextBundleTask&>(*t);
                                                        NeighborDatabase &db = (**this).getNeighborDB();

                                                        ibrcommon::MutexLock l(db);
                                                        NeighborDatabase::NeighborEntry &entry = db.get(task.eid);

                                                        try {
                                                                // get the bundle filter of the neighbor
                                                                BundleFilter filter(entry);

                                                                // some debug output
                                                                IBRCOMMON_LOGGER_DEBUG(40) << "search some bundles not known by " << task.eid.getString() << IBRCOMMON_LOGGER_ENDL;

                                                                // blacklist the neighbor itself, because this is handled by neighbor routing extension
                                                                filter.blacklist(task.eid);

                                                                // query some unknown bundle from the storage, the list contains max. 10 items.
                                                                const std::list<dtn::data::MetaBundle> list = storage.get(filter);

                                                                // send the bundles as long as we have resources
                                                                for (std::list<dtn::data::MetaBundle>::const_iterator iter = list.begin(); iter != list.end(); iter++)
                                                                {
                                                                        try {
                                                                                // transfer the bundle to the neighbor
                                                                                transferTo(entry, *iter);
                                                                        } catch (const NeighborDatabase::AlreadyInTransitException&) { };
                                                                }
                                                        } catch (const NeighborDatabase::BloomfilterNotAvailableException&) {
                                                                // query a new summary vector from this neighbor
                                                                (**this).doHandshake(task.eid);
                                                        }
                                                } catch (const NeighborDatabase::NoMoreTransfersAvailable&) {
                                                } catch (const NeighborDatabase::NeighborNotAvailableException&) {
                                                } catch (const std::bad_cast&) { };
                                        } catch (const ibrcommon::Exception &ex) {
                                                IBRCOMMON_LOGGER_DEBUG(20) << "Exception occurred in EpidemicRoutingExtension: " << ex.what() << IBRCOMMON_LOGGER_ENDL;
                                        }
                                } catch (const std::exception&) {
                                        return;
                                }

                                yield();
                        }
                }

                /****************************************/

                EpidemicRoutingExtension::SearchNextBundleTask::SearchNextBundleTask(const dtn::data::EID &e)
                 : eid(e)
                { }

                EpidemicRoutingExtension::SearchNextBundleTask::~SearchNextBundleTask()
                { }

                std::string EpidemicRoutingExtension::SearchNextBundleTask::toString()
                {
                        return "SearchNextBundleTask: " + eid.getString();
                }
        }
}