154 lines
4.3 KiB
C++
154 lines
4.3 KiB
C++
/*
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Copyright (c) 2007-2018, Arvid Norberg
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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 OBSERVER_HPP
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#define OBSERVER_HPP
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#include <cstdint>
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#include <memory>
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#include <libtorrent/time.hpp>
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#include <libtorrent/address.hpp>
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#include <libtorrent/flags.hpp>
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#include <libtorrent/socket.hpp> // for udp
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#include <libtorrent/kademlia/node_id.hpp>
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namespace libtorrent {
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namespace dht {
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struct dht_observer;
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struct observer;
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struct msg;
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struct traversal_algorithm;
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using observer_flags_t = libtorrent::flags::bitfield_flag<std::uint8_t, struct observer_flags_tag>;
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struct TORRENT_EXTRA_EXPORT observer
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: std::enable_shared_from_this<observer>
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{
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observer(std::shared_ptr<traversal_algorithm> a
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, udp::endpoint const& ep, node_id const& id)
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: m_algorithm(std::move(a))
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, m_id(id)
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{
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TORRENT_ASSERT(m_algorithm);
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set_target(ep);
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}
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observer(observer const&) = delete;
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observer& operator=(observer const&) = delete;
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// defined in rpc_manager.cpp
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virtual ~observer();
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// this is called when a reply is received
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virtual void reply(msg const& m) = 0;
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// this is called if no response has been received after
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// a few seconds, before the request has timed out
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void short_timeout();
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bool has_short_timeout() const { return bool(flags & flag_short_timeout); }
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// this is called when no reply has been received within
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// some timeout, or a reply with incorrect format.
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virtual void timeout();
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// if this is called the destructor should
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// not invoke any new messages, and should
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// only clean up. It means the rpc-manager
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// is being destructed
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void abort();
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dht_observer* get_observer() const;
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traversal_algorithm* algorithm() const { return m_algorithm.get(); }
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time_point sent() const { return m_sent; }
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void set_target(udp::endpoint const& ep);
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address target_addr() const;
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udp::endpoint target_ep() const;
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void set_id(node_id const& id);
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node_id const& id() const { return m_id; }
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static constexpr observer_flags_t flag_queried = 0_bit;
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static constexpr observer_flags_t flag_initial = 1_bit;
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static constexpr observer_flags_t flag_no_id = 2_bit;
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static constexpr observer_flags_t flag_short_timeout = 3_bit;
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static constexpr observer_flags_t flag_failed = 4_bit;
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static constexpr observer_flags_t flag_ipv6_address = 5_bit;
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static constexpr observer_flags_t flag_alive = 6_bit;
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static constexpr observer_flags_t flag_done = 7_bit;
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protected:
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void done();
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private:
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std::shared_ptr<observer> self()
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{ return shared_from_this(); }
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time_point m_sent;
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std::shared_ptr<traversal_algorithm> const m_algorithm;
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node_id m_id;
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union addr_t
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{
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address_v6::bytes_type v6;
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address_v4::bytes_type v4;
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} m_addr;
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std::uint16_t m_port = 0;
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public:
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observer_flags_t flags{};
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#if TORRENT_USE_ASSERTS
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bool m_in_constructor = true;
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bool m_was_sent = false;
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bool m_was_abandoned = false;
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bool m_in_use = true;
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#endif
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};
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using observer_ptr = std::shared_ptr<observer>;
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}
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}
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#endif
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