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/*
Copyright (c) 2007-2009 FastMQ Inc.
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "zmq_engine.hpp"
#include "io_thread.hpp"
#include "i_inout.hpp"
#include "config.hpp"
#include "err.hpp"
zmq::zmq_engine_t::zmq_engine_t (io_thread_t *parent_, fd_t fd_) :
io_object_t (parent_),
insize (0),
inpos (0),
outsize (0),
outpos (0),
inout (NULL)
{
// Allocate read & write buffer.
inbuf = (unsigned char*) malloc (in_batch_size);
zmq_assert (inbuf);
outbuf = (unsigned char*) malloc (out_batch_size);
zmq_assert (outbuf);
// Initialise the underlying socket.
int rc = tcp_socket.open (fd_);
zmq_assert (rc == 0);
}
zmq::zmq_engine_t::~zmq_engine_t ()
{
free (outbuf);
free (inbuf);
}
void zmq::zmq_engine_t::plug (i_inout *inout_)
{
encoder.set_inout (inout_);
decoder.set_inout (inout_);
handle = add_fd (tcp_socket.get_fd ());
set_pollin (handle);
set_pollout (handle);
inout = inout_;
}
void zmq::zmq_engine_t::unplug ()
{
rm_fd (handle);
inout = NULL;
}
void zmq::zmq_engine_t::in_event ()
{
// If there's no data to process in the buffer, read new data.
if (inpos == insize) {
// Read as much data as possible to the read buffer.
insize = tcp_socket.read (inbuf, in_batch_size);
inpos = 0;
// Check whether the peer has closed the connection.
if (insize == -1) {
insize = 0;
error ();
return;
}
}
// Following code should be executed even if there's not a single byte in
// the buffer. There still can be a decoded messages stored in the decoder.
// Push the data to the decoder.
int nbytes = decoder.write (inbuf + inpos, insize - inpos);
// Adjust read position. Stop polling for input if we got stuck.
inpos += nbytes;
if (inpos < insize)
reset_pollin (handle);
// If at least one byte was processed, flush all messages the decoder
// may have produced.
if (nbytes > 0)
inout->flush ();
}
void zmq::zmq_engine_t::out_event ()
{
// If write buffer is empty, try to read new data from the encoder.
if (outpos == outsize) {
outsize = encoder.read (outbuf, out_batch_size);
outpos = 0;
// If there is no data to send, stop polling for output.
if (outsize == 0)
reset_pollout (handle);
}
// If there are any data to write in write buffer, write as much as
// possible to the socket.
if (outpos < outsize) {
int nbytes = tcp_socket.write (outbuf + outpos, outsize - outpos);
// Handle problems with the connection.
if (nbytes == -1) {
error ();
return;
}
outpos += nbytes;
}
}
void zmq::zmq_engine_t::revive ()
{
set_pollout (handle);
}
void zmq::zmq_engine_t::error ()
{
zmq_assert (inout);
inout->detach ();
unplug ();
delete this;
}
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