153 lines
4.2 KiB
C++
153 lines
4.2 KiB
C++
/*
|
|
|
|
Copyright (c) 2006, Arvid Norberg & Daniel Wallin
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the distribution.
|
|
* Neither the name of the author nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#ifndef TRAVERSAL_ALGORITHM_050324_HPP
|
|
#define TRAVERSAL_ALGORITHM_050324_HPP
|
|
|
|
#include <vector>
|
|
#include <set>
|
|
|
|
#include <libtorrent/kademlia/node_id.hpp>
|
|
#include <libtorrent/kademlia/routing_table.hpp>
|
|
#include <libtorrent/kademlia/logging.hpp>
|
|
|
|
#include <boost/noncopyable.hpp>
|
|
#include <boost/intrusive_ptr.hpp>
|
|
#include <boost/bind.hpp>
|
|
#include <boost/pool/pool.hpp>
|
|
|
|
namespace libtorrent { struct dht_lookup; }
|
|
namespace libtorrent { namespace dht
|
|
{
|
|
#ifdef TORRENT_DHT_VERBOSE_LOGGING
|
|
TORRENT_DECLARE_LOG(traversal);
|
|
#endif
|
|
|
|
class rpc_manager;
|
|
class node_impl;
|
|
|
|
// this class may not be instantiated as a stack object
|
|
class traversal_algorithm : boost::noncopyable
|
|
{
|
|
public:
|
|
void traverse(node_id const& id, udp::endpoint addr);
|
|
void finished(node_id const& id);
|
|
void failed(node_id const& id, bool prevent_request = false);
|
|
virtual ~traversal_algorithm();
|
|
boost::pool<>& allocator() const;
|
|
void status(dht_lookup& l);
|
|
|
|
virtual char const* name() const { return "traversal_algorithm"; }
|
|
|
|
node_id const& target() const { return m_target; }
|
|
|
|
protected:
|
|
|
|
template<class InIt>
|
|
traversal_algorithm(node_impl& node, node_id target, InIt start, InIt end);
|
|
|
|
void add_requests();
|
|
void add_entry(node_id const& id, udp::endpoint addr, unsigned char flags);
|
|
void add_router_entries();
|
|
void init();
|
|
|
|
virtual void done() = 0;
|
|
virtual void invoke(node_id const& id, udp::endpoint addr) = 0;
|
|
|
|
struct result
|
|
{
|
|
result(node_id const& id, udp::endpoint addr, unsigned char f = 0)
|
|
: id(id), addr(addr), flags(f) {}
|
|
|
|
node_id id;
|
|
udp::endpoint addr;
|
|
enum { queried = 1, initial = 2, no_id = 4 };
|
|
unsigned char flags;
|
|
};
|
|
|
|
std::vector<result>::iterator last_iterator();
|
|
|
|
friend void intrusive_ptr_add_ref(traversal_algorithm* p)
|
|
{
|
|
p->m_ref_count++;
|
|
}
|
|
|
|
friend void intrusive_ptr_release(traversal_algorithm* p)
|
|
{
|
|
if (--p->m_ref_count == 0)
|
|
delete p;
|
|
}
|
|
|
|
int m_ref_count;
|
|
|
|
node_impl& m_node;
|
|
node_id m_target;
|
|
std::vector<result> m_results;
|
|
std::set<udp::endpoint> m_failed;
|
|
int m_invoke_count;
|
|
int m_branch_factor;
|
|
int m_responses;
|
|
int m_timeouts;
|
|
};
|
|
|
|
template<class InIt>
|
|
traversal_algorithm::traversal_algorithm(
|
|
node_impl& node
|
|
, node_id target
|
|
, InIt start // <- nodes to initiate traversal with
|
|
, InIt end)
|
|
: m_ref_count(0)
|
|
, m_node(node)
|
|
, m_target(target)
|
|
, m_invoke_count(0)
|
|
, m_branch_factor(3)
|
|
, m_responses(0)
|
|
, m_timeouts(0)
|
|
{
|
|
using boost::bind;
|
|
|
|
for (InIt i = start; i != end; ++i)
|
|
{
|
|
add_entry(i->id, udp::endpoint(i->addr, i->port), result::initial);
|
|
}
|
|
|
|
// in case the routing table is empty, use the
|
|
// router nodes in the table
|
|
if (start == end) add_router_entries();
|
|
init();
|
|
}
|
|
|
|
} } // namespace libtorrent::dht
|
|
|
|
#endif // TRAVERSAL_ALGORITHM_050324_HPP
|
|
|