147 lines
4.3 KiB
C++
147 lines
4.3 KiB
C++
/*
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Copyright (c) 2006-2018, Arvid Norberg & Daniel Wallin
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TRAVERSAL_ALGORITHM_050324_HPP
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#define TRAVERSAL_ALGORITHM_050324_HPP
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#include <vector>
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#include <set>
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#include <libtorrent/kademlia/node_id.hpp>
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#include <libtorrent/kademlia/routing_table.hpp>
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#include <libtorrent/kademlia/observer.hpp>
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#include <libtorrent/address.hpp>
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#include <boost/noncopyable.hpp>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/bind.hpp>
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#include <boost/pool/pool.hpp>
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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namespace libtorrent { struct dht_lookup; }
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namespace libtorrent { namespace dht
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{
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class rpc_manager;
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class node;
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// this class may not be instantiated as a stack object
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struct TORRENT_EXTRA_EXPORT traversal_algorithm : boost::noncopyable
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{
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void traverse(node_id const& id, udp::endpoint addr);
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void finished(observer_ptr o);
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enum flags_t { prevent_request = 1, short_timeout = 2 };
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void failed(observer_ptr o, int flags = 0);
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virtual ~traversal_algorithm();
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void status(dht_lookup& l);
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void* allocate_observer();
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void free_observer(void* ptr);
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virtual char const* name() const;
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virtual void start();
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node_id const& target() const { return m_target; }
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void resort_results();
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void add_entry(node_id const& id, udp::endpoint addr, unsigned char flags);
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traversal_algorithm(node & node, node_id target);
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int invoke_count() const { return m_invoke_count; }
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int branch_factor() const { return m_branch_factor; }
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node& get_node() const { return m_node; }
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protected:
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// returns true if we're done
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bool add_requests();
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void add_router_entries();
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void init();
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virtual void done();
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// should construct an algorithm dependent
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// observer in ptr.
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virtual observer_ptr new_observer(void* ptr
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, udp::endpoint const& ep, node_id const& id);
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virtual bool invoke(observer_ptr) { return false; }
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friend void intrusive_ptr_add_ref(traversal_algorithm* p)
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{
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TORRENT_ASSERT(p->m_ref_count < 0xffff);
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p->m_ref_count++;
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}
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friend void intrusive_ptr_release(traversal_algorithm* p)
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{
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if (--p->m_ref_count == 0)
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delete p;
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}
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node & m_node;
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std::vector<observer_ptr> m_results;
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node_id const m_target;
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boost::uint16_t m_ref_count;
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boost::int16_t m_invoke_count;
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boost::int16_t m_branch_factor;
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boost::int16_t m_responses;
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boost::int16_t m_timeouts;
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// the IP addresses of the nodes in m_results
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std::set<boost::uint32_t> m_peer4_prefixes;
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// no IPv6 support yet anyway
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// std::set<boost::uint64_t> m_peer6_prefixes;
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};
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struct traversal_observer : observer
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{
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traversal_observer(
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boost::intrusive_ptr<traversal_algorithm> const& algorithm
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, udp::endpoint const& ep, node_id const& id)
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: observer(algorithm, ep, id)
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{}
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// parses out "nodes" and keeps traversing
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virtual void reply(msg const&);
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};
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} } // namespace libtorrent::dht
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#endif // TRAVERSAL_ALGORITHM_050324_HPP
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