From b3bac1760735703a11297df3d0e2a2e5252aa45e Mon Sep 17 00:00:00 2001 From: Martin Sustrik Date: Tue, 16 Aug 2011 12:44:34 +0200 Subject: tcp_engine renamed to stream engine The engine was not used exclusively for TCP connections. Rather it was used to handle any socket with SOCK_STREAM semantics. The class was renamed to reflect its true function. Signed-off-by: Martin Sustrik --- src/tcp_engine.cpp | 374 ----------------------------------------------------- 1 file changed, 374 deletions(-) delete mode 100644 src/tcp_engine.cpp (limited to 'src/tcp_engine.cpp') diff --git a/src/tcp_engine.cpp b/src/tcp_engine.cpp deleted file mode 100644 index f938d71..0000000 --- a/src/tcp_engine.cpp +++ /dev/null @@ -1,374 +0,0 @@ -/* - Copyright (c) 2007-2011 iMatix Corporation - Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file - - This file is part of 0MQ. - - 0MQ is free software; you can redistribute it and/or modify it under - the terms of the GNU Lesser 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 - GNU Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with this program. If not, see . -*/ - -#include "platform.hpp" -#if defined ZMQ_HAVE_WINDOWS -#include "windows.hpp" -#else -#include -#include -#include -#include -#include -#include -#include -#endif - -#include -#include - -#include "tcp_engine.hpp" -#include "io_thread.hpp" -#include "session.hpp" -#include "config.hpp" -#include "err.hpp" -#include "ip.hpp" - -zmq::tcp_engine_t::tcp_engine_t (fd_t fd_, const options_t &options_) : - s (fd_), - inpos (NULL), - insize (0), - decoder (in_batch_size, options_.maxmsgsize), - outpos (NULL), - outsize (0), - encoder (out_batch_size), - session (NULL), - leftover_session (NULL), - options (options_), - plugged (false) -{ - // Get the socket into non-blocking mode. - unblock_socket (s); - - // Set the socket buffer limits for the underlying socket. - if (options.sndbuf) { - int rc = setsockopt (s, SOL_SOCKET, SO_SNDBUF, - (char*) &options.sndbuf, sizeof (int)); -#ifdef ZMQ_HAVE_WINDOWS - wsa_assert (rc != SOCKET_ERROR); -#else - errno_assert (rc == 0); -#endif - } - if (options.rcvbuf) { - int rc = setsockopt (s, SOL_SOCKET, SO_RCVBUF, - (char*) &options.rcvbuf, sizeof (int)); -#ifdef ZMQ_HAVE_WINDOWS - wsa_assert (rc != SOCKET_ERROR); -#else - errno_assert (rc == 0); -#endif - } - -#if defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_FREEBSD - // Make sure that SIGPIPE signal is not generated when writing to a - // connection that was already closed by the peer. - int set = 1; - int rc = setsockopt (s, SOL_SOCKET, SO_NOSIGPIPE, &set, sizeof (int)); - errno_assert (rc == 0); -#endif -} - -zmq::tcp_engine_t::~tcp_engine_t () -{ - zmq_assert (!plugged); - - if (s != retired_fd) { -#ifdef ZMQ_HAVE_WINDOWS - int rc = closesocket (s); - wsa_assert (rc != SOCKET_ERROR); -#else - int rc = close (s); - errno_assert (rc == 0); -#endif - s = retired_fd; - } -} - -void zmq::tcp_engine_t::plug (io_thread_t *io_thread_, session_t *session_) -{ - zmq_assert (!plugged); - plugged = true; - leftover_session = NULL; - - // Connect to session object. - zmq_assert (!session); - zmq_assert (session_); - encoder.set_session (session_); - decoder.set_session (session_); - session = session_; - - // Connect to I/O threads poller object. - io_object_t::plug (io_thread_); - handle = add_fd (s); - set_pollin (handle); - set_pollout (handle); - - // Flush all the data that may have been already received downstream. - in_event (); -} - -void zmq::tcp_engine_t::unplug () -{ - zmq_assert (plugged); - plugged = false; - - // Cancel all fd subscriptions. - rm_fd (handle); - - // Disconnect from I/O threads poller object. - io_object_t::unplug (); - - // Disconnect from session object. - encoder.set_session (NULL); - decoder.set_session (NULL); - leftover_session = session; - session = NULL; -} - -void zmq::tcp_engine_t::terminate () -{ - unplug (); - delete this; -} - -void zmq::tcp_engine_t::in_event () -{ - bool disconnection = false; - - // If there's no data to process in the buffer... - if (!insize) { - - // Retrieve the buffer and read as much data as possible. - // Note that buffer can be arbitrarily large. However, we assume - // the underlying TCP layer has fixed buffer size and thus the - // number of bytes read will be always limited. - decoder.get_buffer (&inpos, &insize); - insize = read (inpos, insize); - - // Check whether the peer has closed the connection. - if (insize == (size_t) -1) { - insize = 0; - disconnection = true; - } - } - - // Push the data to the decoder. - size_t processed = decoder.process_buffer (inpos, insize); - - if (unlikely (processed == (size_t) -1)) { - disconnection = true; - } - else { - - // Stop polling for input if we got stuck. - if (processed < insize) { - - // This may happen if queue limits are in effect. - if (plugged) - reset_pollin (handle); - } - - // Adjust the buffer. - inpos += processed; - insize -= processed; - } - - // Flush all messages the decoder may have produced. - // If IO handler has unplugged engine, flush transient IO handler. - if (unlikely (!plugged)) { - zmq_assert (leftover_session); - leftover_session->flush (); - } else { - session->flush (); - } - - if (session && disconnection) - error (); -} - -void zmq::tcp_engine_t::out_event () -{ - // If write buffer is empty, try to read new data from the encoder. - if (!outsize) { - - outpos = NULL; - encoder.get_data (&outpos, &outsize); - - // If IO handler has unplugged engine, flush transient IO handler. - if (unlikely (!plugged)) { - zmq_assert (leftover_session); - leftover_session->flush (); - return; - } - - // If there is no data to send, stop polling for output. - if (outsize == 0) { - reset_pollout (handle); - return; - } - } - - // If there are any data to write in write buffer, write as much as - // possible to the socket. Note that amount of data to write can be - // arbitratily large. However, we assume that underlying TCP layer has - // limited transmission buffer and thus the actual number of bytes - // written should be reasonably modest. - int nbytes = write (outpos, outsize); - - // Handle problems with the connection. - if (nbytes == -1) { - error (); - return; - } - - outpos += nbytes; - outsize -= nbytes; -} - -void zmq::tcp_engine_t::activate_out () -{ - set_pollout (handle); - - // Speculative write: The assumption is that at the moment new message - // was sent by the user the socket is probably available for writing. - // Thus we try to write the data to socket avoiding polling for POLLOUT. - // Consequently, the latency should be better in request/reply scenarios. - out_event (); -} - -void zmq::tcp_engine_t::activate_in () -{ - set_pollin (handle); - - // Speculative read. - in_event (); -} - -void zmq::tcp_engine_t::error () -{ - zmq_assert (session); - session->detach (); - unplug (); - delete this; -} - -int zmq::tcp_engine_t::write (const void *data_, size_t size_) -{ -#ifdef ZMQ_HAVE_WINDOWS - - int nbytes = send (s, (char*) data_, (int) size_, 0); - - // If not a single byte can be written to the socket in non-blocking mode - // we'll get an error (this may happen during the speculative write). - if (nbytes == SOCKET_ERROR && WSAGetLastError () == WSAEWOULDBLOCK) - return 0; - - // Signalise peer failure. - if (nbytes == -1 && ( - WSAGetLastError () == WSAENETDOWN || - WSAGetLastError () == WSAENETRESET || - WSAGetLastError () == WSAEHOSTUNREACH || - WSAGetLastError () == WSAECONNABORTED || - WSAGetLastError () == WSAETIMEDOUT || - WSAGetLastError () == WSAECONNRESET)) - return -1; - - wsa_assert (nbytes != SOCKET_ERROR); - return (size_t) nbytes; - -#else - - ssize_t nbytes = send (s, data_, size_, 0); - - // Several errors are OK. When speculative write is being done we may not - // be able to write a single byte from the socket. Also, SIGSTOP issued - // by a debugging tool can result in EINTR error. - if (nbytes == -1 && (errno == EAGAIN || errno == EWOULDBLOCK || - errno == EINTR)) - return 0; - - // Signalise peer failure. - if (nbytes == -1 && (errno == ECONNRESET || errno == EPIPE)) - return -1; - - errno_assert (nbytes != -1); - return (size_t) nbytes; - -#endif -} - -int zmq::tcp_engine_t::read (void *data_, size_t size_) -{ -#ifdef ZMQ_HAVE_WINDOWS - - int nbytes = recv (s, (char*) data_, (int) size_, 0); - - // If not a single byte can be read from the socket in non-blocking mode - // we'll get an error (this may happen during the speculative read). - if (nbytes == SOCKET_ERROR && WSAGetLastError () == WSAEWOULDBLOCK) - return 0; - - // Connection failure. - if (nbytes == -1 && ( - WSAGetLastError () == WSAENETDOWN || - WSAGetLastError () == WSAENETRESET || - WSAGetLastError () == WSAECONNABORTED || - WSAGetLastError () == WSAETIMEDOUT || - WSAGetLastError () == WSAECONNRESET || - WSAGetLastError () == WSAECONNREFUSED || - WSAGetLastError () == WSAENOTCONN)) - return -1; - - wsa_assert (nbytes != SOCKET_ERROR); - - // Orderly shutdown by the other peer. - if (nbytes == 0) - return -1; - - return (size_t) nbytes; - -#else - - ssize_t nbytes = recv (s, data_, size_, 0); - - // Several errors are OK. When speculative read is being done we may not - // be able to read a single byte from the socket. Also, SIGSTOP issued - // by a debugging tool can result in EINTR error. - if (nbytes == -1 && (errno == EAGAIN || errno == EWOULDBLOCK || - errno == EINTR)) - return 0; - - // Signalise peer failure. - if (nbytes == -1 && (errno == ECONNRESET || errno == ECONNREFUSED || - errno == ETIMEDOUT || errno == EHOSTUNREACH)) - return -1; - - errno_assert (nbytes != -1); - - // Orderly shutdown by the peer. - if (nbytes == 0) - return -1; - - return (size_t) nbytes; - -#endif -} - -- cgit v1.2.3