mirror of
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149 lines
4.4 KiB
C++
149 lines
4.4 KiB
C++
/*
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Copyright (c) 2009-2011 250bpm s.r.o.
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Copyright (c) 2007-2009 iMatix Corporation
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Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser 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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0MQ 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_STREAM_ENGINE_HPP_INCLUDED__
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#define __ZMQ_STREAM_ENGINE_HPP_INCLUDED__
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#include <stddef.h>
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#include "fd.hpp"
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#include "i_engine.hpp"
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#include "i_msg_sink.hpp"
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#include "io_object.hpp"
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#include "i_encoder.hpp"
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#include "i_decoder.hpp"
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#include "options.hpp"
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#include "socket_base.hpp"
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#include "../include/zmq.h"
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namespace zmq
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{
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class io_thread_t;
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class session_base_t;
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// This engine handles any socket with SOCK_STREAM semantics,
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// e.g. TCP socket or an UNIX domain socket.
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class stream_engine_t : public io_object_t, public i_engine, public i_msg_sink
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{
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public:
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stream_engine_t (fd_t fd_, const options_t &options_, const std::string &endpoint);
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~stream_engine_t ();
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// i_engine interface implementation.
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void plug (zmq::io_thread_t *io_thread_,
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zmq::session_base_t *session_);
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void terminate ();
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void activate_in ();
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void activate_out ();
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// i_msg_sink interface implementation.
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virtual int push_msg (msg_t *msg_);
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// i_poll_events interface implementation.
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void in_event ();
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void out_event ();
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private:
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// Unplug the engine from the session.
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void unplug ();
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// Function to handle network disconnections.
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void error ();
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// Receives the greeting message from the peer.
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int receive_greeting ();
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// Detects the protocol used by the peer.
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bool handshake ();
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// Writes data to the socket. Returns the number of bytes actually
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// written (even zero is to be considered to be a success). In case
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// of error or orderly shutdown by the other peer -1 is returned.
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int write (const void *data_, size_t size_);
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// Reads data from the socket (up to 'size' bytes). Returns the number
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// of bytes actually read (even zero is to be considered to be
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// a success). In case of error or orderly shutdown by the other
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// peer -1 is returned.
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int read (void *data_, size_t size_);
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// Underlying socket.
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fd_t s;
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// Size of the greeting message:
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// Preamble (10 bytes) + version (1 byte) + socket type (1 byte).
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static const size_t greeting_size = 12;
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// True iff we are registered with an I/O poller.
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bool io_enabled;
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handle_t handle;
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unsigned char *inpos;
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size_t insize;
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i_decoder *decoder;
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unsigned char *outpos;
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size_t outsize;
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i_encoder *encoder;
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// When true, we are still trying to determine whether
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// the peer is using versioned protocol, and if so, which
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// version. When false, normal message flow has started.
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bool handshaking;
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// The receive buffer holding the greeting message
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// that we are receiving from the peer.
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unsigned char greeting [greeting_size];
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// The number of bytes of the greeting message that
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// we have already received.
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unsigned int greeting_bytes_read;
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// The send buffer holding the greeting message
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// that we are sending to the peer.
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unsigned char greeting_output_buffer [greeting_size];
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// The session this engine is attached to.
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zmq::session_base_t *session;
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options_t options;
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// String representation of endpoint
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std::string endpoint;
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bool plugged;
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// Socket
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zmq::socket_base_t *socket;
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stream_engine_t (const stream_engine_t&);
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const stream_engine_t &operator = (const stream_engine_t&);
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};
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}
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#endif
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