Implementations of TCP and IPC transports separated

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

1 files changed, 381 insertions, 0 deletions

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 <http://www.gnu.org/licenses/>.
+*/
+
+#include <new>
+#include <string>
+
+#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 <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <fcntl.h>
+#ifdef ZMQ_HAVE_OPENVMS
+#include <ioctl.h>
+#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