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133 lines
4.6 KiB
133 lines
4.6 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file Session.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#pragma once
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#include <mutex>
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#include <array>
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#include <deque>
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#include <set>
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#include <memory>
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#include <utility>
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#include <libdevcore/Common.h>
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#include <libdevcore/RLP.h>
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#include <libdevcore/RangeMask.h>
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#include <libdevcore/Guards.h>
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#include "Common.h"
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namespace dev
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{
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namespace p2p
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{
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struct Node;
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/**
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* @brief The Session class
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* @todo Document fully.
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*/
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class Session: public std::enable_shared_from_this<Session>
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{
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friend class Host;
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friend class HostCapabilityFace;
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public:
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Session(Host* _server, bi::tcp::socket _socket, std::shared_ptr<Node> const& _n, bool _force = false);
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Session(Host* _server, bi::tcp::socket _socket, bi::tcp::endpoint const& _manual);
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virtual ~Session();
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void start();
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void disconnect(DisconnectReason _reason);
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void ping();
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bool isOpen() const { return m_socket.is_open(); }
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NodeId id() const;
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unsigned socketId() const { return m_socket.native_handle(); }
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bi::tcp::endpoint endpoint() const; ///< for other peers to connect to.
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template <class PeerCap>
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std::shared_ptr<PeerCap> cap() const { try { return std::static_pointer_cast<PeerCap>(m_capabilities.at(std::make_pair(PeerCap::name(), PeerCap::version()))); } catch (...) { return nullptr; } }
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static RLPStream& prep(RLPStream& _s, PacketType _t, unsigned _args = 0);
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static RLPStream& prep(RLPStream& _s);
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void sealAndSend(RLPStream& _s);
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void send(bytes&& _msg);
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void send(bytesConstRef _msg);
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int rating() const;
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void addRating(unsigned _r);
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void addNote(std::string const& _k, std::string const& _v) { m_info.notes[_k] = _v; }
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PeerInfo const& info() const { return m_info; }
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void ensureNodesRequested();
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void serviceNodesRequest();
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private:
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/// Drop the connection for the reason @a _r.
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void drop(DisconnectReason _r);
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/// Perform a read on the socket.
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void doRead();
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/// Perform a single round of the write operation. This could end up calling itself asynchronously.
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void write();
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/// Interpret an incoming message.
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bool interpret(RLP const& _r);
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/// @returns true iff the _msg forms a valid message for sending or receiving on the network.
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static bool checkPacket(bytesConstRef _msg);
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Host* m_server; ///< The host that owns us. Never null.
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mutable bi::tcp::socket m_socket; ///< Socket for the peer's connection. Mutable to ask for native_handle().
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Mutex x_writeQueue; ///< Mutex for the write queue.
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std::deque<bytes> m_writeQueue; ///< The write queue.
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std::array<byte, 65536> m_data; ///< Data buffer for the write queue.
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bytes m_incoming; ///< The incoming read queue of bytes.
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PeerInfo m_info; ///< Dyanamic information about this peer.
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unsigned m_protocolVersion = 0; ///< The protocol version of the peer.
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std::shared_ptr<Node> m_node; ///< The Node object. Might be null if we constructed using a bare address/port.
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bi::tcp::endpoint m_manualEndpoint; ///< The endpoint as specified by the constructor.
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bool m_force = false; ///< If true, ignore IDs being different. This could open you up to MitM attacks.
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bool m_dropped = false; ///< If true, we've already divested ourselves of this peer. We're just waiting for the reads & writes to fail before the shared_ptr goes OOS and the destructor kicks in.
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bool m_theyRequestedNodes = false; ///< Has the peer requested nodes from us without receiveing an answer from us?
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bool m_weRequestedNodes = false; ///< Have we requested nodes from the peer and not received an answer yet?
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std::chrono::steady_clock::time_point m_connect; ///< Time point of connection.
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std::chrono::steady_clock::time_point m_ping; ///< Time point of last ping.
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std::chrono::steady_clock::time_point m_lastReceived; ///< Time point of last message.
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std::map<CapDesc, std::shared_ptr<Capability>> m_capabilities; ///< The peer's capability set.
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RangeMask<unsigned> m_knownNodes; ///< Nodes we already know about as indices into Host's nodesList. These shouldn't be resent to peer.
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};
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}
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}
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