D:/opendownloadmanager/ODM-1.x/Bittorrent/libtorrent-0.12/src/kademlia/refresh.cpp

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/*
  Free Download Manager Copyright (c) 2003-2007 FreeDownloadManager.ORG
*/  


 

#include <libtorrent/kademlia/refresh.hpp>
#include <libtorrent/kademlia/routing_table.hpp>
#include <libtorrent/kademlia/rpc_manager.hpp>
#include <libtorrent/kademlia/logging.hpp>

#include <libtorrent/io.hpp>

#include <boost/bind.hpp>

using boost::bind;

namespace libtorrent { namespace dht
{

using asio::ip::udp;

#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_DEFINE_LOG(refresh)
#endif

typedef boost::shared_ptr<observer> observer_ptr;

class refresh_observer : public observer
{
public:
        refresh_observer(
                boost::intrusive_ptr<refresh> const& algorithm
                , node_id self
                , node_id target
        )
                : m_target(target) 
                , m_self(self)
                , m_algorithm(algorithm)
        {}
        ~refresh_observer();

        void send(msg& m)
        {
                m.info_hash = m_target;
        }

        void timeout();
        void reply(msg const& m);
        void abort() { m_algorithm = 0; } 

private:
        node_id const m_target;
        node_id const m_self;
        boost::intrusive_ptr<refresh> m_algorithm;
};

refresh_observer::~refresh_observer()
{
        if (m_algorithm) m_algorithm->failed(m_self, true);
}

void refresh_observer::reply(msg const& in)
{
        if (!m_algorithm) return;

        if (!in.nodes.empty())
        {
                for (msg::nodes_t::const_iterator i = in.nodes.begin()
                        , end(in.nodes.end()); i != end; ++i)
                {
                        m_algorithm->traverse(i->id, i->addr);
                }
        }
        m_algorithm->finished(m_self);
        m_algorithm = 0;
}

void refresh_observer::timeout()
{
        if (!m_algorithm) return;
        m_algorithm->failed(m_self);
        m_algorithm = 0;
}

class ping_observer : public observer
{
public:
        ping_observer(
                boost::intrusive_ptr<refresh> const& algorithm
                , node_id self
        )
                : m_self(self)
                , m_algorithm(algorithm)
        {}
        ~ping_observer();

        void send(msg& p) {}
        void timeout();
        void reply(msg const& m);
        void abort() { m_algorithm = 0; } 

private:
        node_id const m_self;
        boost::intrusive_ptr<refresh> m_algorithm;
};

ping_observer::~ping_observer()
{
        if (m_algorithm) m_algorithm->ping_timeout(m_self, true);
}

void ping_observer::reply(msg const& m)
{
        if (!m_algorithm) return;
        
        m_algorithm->ping_reply(m_self);
        m_algorithm = 0;
}

void ping_observer::timeout()
{
        if (!m_algorithm) return;
        m_algorithm->ping_timeout(m_self);
        m_algorithm = 0;
}

void refresh::invoke(node_id const& nid, udp::endpoint addr)
{
        observer_ptr p(new refresh_observer(
                this
                , nid
                , m_target
        ));

        m_rpc.invoke(messages::find_node, addr, p);
}

void refresh::done()
{
        m_leftover_nodes_iterator = (int)m_results.size() > m_max_results ?
                m_results.begin() + m_max_results : m_results.end();

        invoke_pings_or_finish();
}

void refresh::ping_reply(node_id nid)
{
        m_active_pings--;
        invoke_pings_or_finish();
}

void refresh::ping_timeout(node_id nid, bool prevent_request)
{
        m_active_pings--;
        invoke_pings_or_finish(prevent_request);
}

void refresh::invoke_pings_or_finish(bool prevent_request)
{
        if (prevent_request)
        {
                --m_max_active_pings;
                if (m_max_active_pings <= 0)
                        m_max_active_pings = 1;
        }
        else
        {
                while (m_active_pings < m_max_active_pings)
                {
                        if (m_leftover_nodes_iterator == m_results.end()) break;

                        result const& node = *m_leftover_nodes_iterator;

                        
                        if (node.flags & result::initial)
                        {
                                ++m_leftover_nodes_iterator;
                                continue;
                        }

                        try
                        {
                                observer_ptr p(new ping_observer(this, node.id));
                                m_rpc.invoke(messages::ping, node.addr, p);
                                ++m_active_pings;
                                ++m_leftover_nodes_iterator;
                        }
                        catch (std::exception& e) {}
                }
        }

        if (m_active_pings == 0)
        {
                m_done_callback();
        }
}

} } 

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