From 5ac63140b01fed145fa41f613308e134420920ab Mon Sep 17 00:00:00 2001 From: Martin Sustrik Date: Thu, 28 Jul 2011 13:19:55 +0200 Subject: Implementations of TCP and IPC transports separated Signed-off-by: Martin Sustrik --- src/ipc_connecter.cpp | 381 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 381 insertions(+) create mode 100644 src/ipc_connecter.cpp (limited to 'src/ipc_connecter.cpp') diff --git a/src/ipc_connecter.cpp b/src/ipc_connecter.cpp new file mode 100644 index 0000000..942cd49 --- /dev/null +++ b/src/ipc_connecter.cpp @@ -0,0 +1,381 @@ +/* + 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 +#include + +#include "ipc_connecter.hpp" +#include "tcp_engine.hpp" +#include "io_thread.hpp" +#include "platform.hpp" +#include "random.hpp" +#include "ip.hpp" +#include "err.hpp" + +#if defined ZMQ_HAVE_WINDOWS +#include "windows.hpp" +#else +#include +#include +#include +#include +#include +#include +#include +#include +#ifdef ZMQ_HAVE_OPENVMS +#include +#endif +#endif + +zmq::ipc_connecter_t::ipc_connecter_t (class io_thread_t *io_thread_, + class session_t *session_, const options_t &options_, + const char *address_, bool wait_) : + own_t (io_thread_, options_), + io_object_t (io_thread_), + s (retired_fd), + handle_valid (false), + wait (wait_), + session (session_), + current_reconnect_ivl(options.reconnect_ivl) +{ + memset (&addr, 0, sizeof (addr)); + addr_len = 0; + + // TODO: set_addess should be called separately, so that the error + // can be propagated. + int rc = set_address (address_); + zmq_assert (rc == 0); +} + +zmq::ipc_connecter_t::~ipc_connecter_t () +{ + if (wait) + cancel_timer (reconnect_timer_id); + if (handle_valid) + rm_fd (handle); + + if (s != retired_fd) + close (); +} + +void zmq::ipc_connecter_t::process_plug () +{ + if (wait) + add_reconnect_timer(); + else + start_connecting (); +} + +void zmq::ipc_connecter_t::in_event () +{ + // We are not polling for incomming data, so we are actually called + // because of error here. However, we can get error on out event as well + // on some platforms, so we'll simply handle both events in the same way. + out_event (); +} + +void zmq::ipc_connecter_t::out_event () +{ + fd_t fd = connect (); + rm_fd (handle); + handle_valid = false; + + // Handle the error condition by attempt to reconnect. + if (fd == retired_fd) { + close (); + wait = true; + add_reconnect_timer(); + return; + } + + // Create the engine object for this connection. + tcp_engine_t *engine = new (std::nothrow) tcp_engine_t (fd, options); + alloc_assert (engine); + + // Attach the engine to the corresponding session object. + send_attach (session, engine); + + // Shut the connecter down. + terminate (); +} + +void zmq::ipc_connecter_t::timer_event (int id_) +{ + zmq_assert (id_ == reconnect_timer_id); + wait = false; + start_connecting (); +} + +void zmq::ipc_connecter_t::start_connecting () +{ + // Open the connecting socket. + int rc = open (); + + // Connect may succeed in synchronous manner. + if (rc == 0) { + handle = add_fd (s); + handle_valid = true; + out_event (); + return; + } + + // Connection establishment may be dealyed. Poll for its completion. + else if (rc == -1 && errno == EAGAIN) { + handle = add_fd (s); + handle_valid = true; + set_pollout (handle); + return; + } + + // Handle any other error condition by eventual reconnect. + wait = true; + add_reconnect_timer(); +} + +void zmq::ipc_connecter_t::add_reconnect_timer() +{ + add_timer (get_new_reconnect_ivl(), reconnect_timer_id); +} + +int zmq::ipc_connecter_t::get_new_reconnect_ivl () +{ + // The new interval is the current interval + random value. + int this_interval = current_reconnect_ivl + + (generate_random () % options.reconnect_ivl); + + // Only change the current reconnect interval if the maximum reconnect + // interval was set and if it's larger than the reconnect interval. + if (options.reconnect_ivl_max > 0 && + options.reconnect_ivl_max > options.reconnect_ivl) { + + // Calculate the next interval + current_reconnect_ivl = current_reconnect_ivl * 2; + if(current_reconnect_ivl >= options.reconnect_ivl_max) { + current_reconnect_ivl = options.reconnect_ivl_max; + } + } + return this_interval; +} + +#ifdef ZMQ_HAVE_WINDOWS + +int zmq::ipc_connecter_t::set_address (const char *protocol_, const char *addr_) +{ + errno = EPROTONOSUPPORT; + return -1; +} + +int zmq::ipc_connecter_t::open () +{ + zmq_assert (s == retired_fd); + + // Create the socket. + s = socket (addr.ss_family, SOCK_STREAM, IPPROTO_TCP); + if (s == INVALID_SOCKET) { + wsa_error_to_errno (); + return -1; + } + + // Set to non-blocking mode. + unsigned long argp = 1; + int rc = ioctlsocket (s, FIONBIO, &argp); + wsa_assert (rc != SOCKET_ERROR); + + // Connect to the remote peer. + rc = ::connect (s, (sockaddr*) &addr, addr_len); + + // Connect was successfull immediately. + if (rc == 0) + return 0; + + // Asynchronous connect was launched. + if (rc == SOCKET_ERROR && (WSAGetLastError () == WSAEINPROGRESS || + WSAGetLastError () == WSAEWOULDBLOCK)) { + errno = EAGAIN; + return -1; + } + + wsa_error_to_errno (); + return -1; +} + +int zmq::ipc_connecter_t::close () +{ + zmq_assert (s != retired_fd); + int rc = closesocket (s); + wsa_assert (rc != SOCKET_ERROR); + s = retired_fd; + return 0; +} + +zmq::fd_t zmq::ipc_connecter_t::connect () +{ + // Nonblocking connect have finished. Check whether an error occured. + int err = 0; + socklen_t len = sizeof err; + int rc = getsockopt (s, SOL_SOCKET, SO_ERROR, (char*) &err, &len); + zmq_assert (rc == 0); + if (err != 0) { + + // Assert that the error was caused by the networking problems + // rather than 0MQ bug. + if (err == WSAECONNREFUSED || err == WSAETIMEDOUT || + err == WSAECONNABORTED || err == WSAEHOSTUNREACH || + err == WSAENETUNREACH || err == WSAENETDOWN) + return retired_fd; + + wsa_assert_no (err); + } + + // Return the newly connected socket. + fd_t result = s; + s = retired_fd; + return result; +} + +#else + +int zmq::ipc_connecter_t::set_address (const char *addr_) +{ + return resolve_local_path (&addr, &addr_len, addr_); +} + +int zmq::ipc_connecter_t::open () +{ + zmq_assert (s == retired_fd); + struct sockaddr *sa = (struct sockaddr*) &addr; + + if (AF_UNIX != sa->sa_family) { + + // Create the socket. + s = socket (sa->sa_family, SOCK_STREAM, IPPROTO_TCP); + if (s == -1) + return -1; + + // Set to non-blocking mode. +#ifdef ZMQ_HAVE_OPENVMS + int flags = 1; + int rc = ioctl (s, FIONBIO, &flags); + errno_assert (rc != -1); +#else + int flags = fcntl (s, F_GETFL, 0); + if (flags == -1) + flags = 0; + int rc = fcntl (s, F_SETFL, flags | O_NONBLOCK); + errno_assert (rc != -1); +#endif + + // Connect to the remote peer. + rc = ::connect (s, (struct sockaddr*) &addr, addr_len); + + // Connect was successfull immediately. + if (rc == 0) + return 0; + + // Asynchronous connect was launched. + if (rc == -1 && errno == EINPROGRESS) { + errno = EAGAIN; + return -1; + } + + // Error occured. + int err = errno; + close (); + errno = err; + return -1; + } + +#ifndef ZMQ_HAVE_OPENVMS + else { + + // Create the socket. + zmq_assert (AF_UNIX == sa->sa_family); + s = socket (AF_UNIX, SOCK_STREAM, 0); + if (s == -1) + return -1; + + // Set the non-blocking flag. + int flag = fcntl (s, F_GETFL, 0); + if (flag == -1) + flag = 0; + int rc = fcntl (s, F_SETFL, flag | O_NONBLOCK); + errno_assert (rc != -1); + + // Connect to the remote peer. + rc = ::connect (s, (struct sockaddr*) &addr, sizeof (sockaddr_un)); + + // Connect was successfull immediately. + if (rc == 0) + return 0; + + // Error occured. + int err = errno; + close (); + errno = err; + return -1; + } +#endif + + zmq_assert (false); + return -1; +} + +int zmq::ipc_connecter_t::close () +{ + zmq_assert (s != retired_fd); + int rc = ::close (s); + if (rc != 0) + return -1; + s = retired_fd; + return 0; +} + +zmq::fd_t zmq::ipc_connecter_t::connect () +{ + // Following code should handle both Berkeley-derived socket + // implementations and Solaris. + int err = 0; +#if defined ZMQ_HAVE_HPUX + int len = sizeof (err); +#else + socklen_t len = sizeof (err); +#endif + int rc = getsockopt (s, SOL_SOCKET, SO_ERROR, (char*) &err, &len); + if (rc == -1) + err = errno; + if (err != 0) { + + // Assert if the error was caused by 0MQ bug. + // Networking problems are OK. No need to assert. + errno = err; + errno_assert (errno == ECONNREFUSED || errno == ECONNRESET || + errno == ETIMEDOUT || errno == EHOSTUNREACH || + errno == ENETUNREACH || errno == ENETDOWN); + + return retired_fd; + } + + fd_t result = s; + s = retired_fd; + return result; +} + +#endif -- cgit v1.2.3