146 lines
3.7 KiB
C++
146 lines
3.7 KiB
C++
/*
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Copyright (c) 2006, 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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#include <libtorrent/kademlia/closest_nodes.hpp>
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#include <libtorrent/kademlia/routing_table.hpp>
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#include <libtorrent/kademlia/rpc_manager.hpp>
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namespace libtorrent { namespace dht
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{
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using asio::ip::udp;
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typedef boost::shared_ptr<observer> observer_ptr;
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class closest_nodes_observer : public observer
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{
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public:
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closest_nodes_observer(
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boost::intrusive_ptr<traversal_algorithm> const& algorithm
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, node_id self
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, node_id target
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)
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: m_algorithm(algorithm)
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, m_target(target)
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, m_self(self)
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{}
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void send(msg& p)
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{
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p.info_hash = m_target;
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}
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void timeout();
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void reply(msg const&);
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private:
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boost::intrusive_ptr<traversal_algorithm> m_algorithm;
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node_id const m_target;
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node_id const m_self;
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};
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void closest_nodes_observer::reply(msg const& in)
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{
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if (!in.nodes.empty())
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{
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for (msg::nodes_t::const_iterator i = in.nodes.begin()
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, end(in.nodes.end()); i != end; ++i)
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{
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m_algorithm->traverse(i->id, i->addr);
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}
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}
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m_algorithm->finished(m_self);
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}
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void closest_nodes_observer::timeout()
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{
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m_algorithm->failed(m_self);
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}
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closest_nodes::closest_nodes(
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node_id target
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, int branch_factor
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, int max_results
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, routing_table& table
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, rpc_manager& rpc
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, done_callback const& callback
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)
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: traversal_algorithm(
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target
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, branch_factor
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, max_results
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, table
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, rpc
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, table.begin()
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, table.end()
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)
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, m_done_callback(callback)
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{
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boost::intrusive_ptr<closest_nodes> self(this);
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add_requests();
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}
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void closest_nodes::invoke(node_id const& id, udp::endpoint addr)
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{
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observer_ptr p(new closest_nodes_observer(this, id, m_target));
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m_rpc.invoke(messages::find_node, addr, p);
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}
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void closest_nodes::done()
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{
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std::vector<node_entry> results;
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int result_size = m_table.bucket_size();
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if (result_size > (int)m_results.size()) result_size = (int)m_results.size();
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for (std::vector<result>::iterator i = m_results.begin()
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, end(m_results.begin() + result_size); i != end; ++i)
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{
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results.push_back(node_entry(i->id, i->addr));
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}
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m_done_callback(results);
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}
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void closest_nodes::initiate(
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node_id target
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, int branch_factor
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, int max_results
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, routing_table& table
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, rpc_manager& rpc
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, done_callback const& callback
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)
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{
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new closest_nodes(target, branch_factor, max_results, table, rpc, callback);
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}
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} } // namespace libtorrent::dht
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