Initial ZMQ bindings.

vendor/ZMQ/src/vmci_connecter.cpp

@@ -0,0 +1,302 @@
+/*
+    Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq 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 "precompiled.hpp"
+
+#include "vmci_connecter.hpp"
+
+#if defined ZMQ_HAVE_VMCI
+
+#include <new>
+
+#include "stream_engine.hpp"
+#include "io_thread.hpp"
+#include "platform.hpp"
+#include "random.hpp"
+#include "err.hpp"
+#include "ip.hpp"
+#include "address.hpp"
+#include "session_base.hpp"
+#include "vmci_address.hpp"
+#include "vmci.hpp"
+
+zmq::vmci_connecter_t::vmci_connecter_t (class io_thread_t *io_thread_,
+                                         class session_base_t *session_,
+                                         const options_t &options_,
+                                         const address_t *addr_,
+                                         bool delayed_start_) :
+    own_t (io_thread_, options_),
+    io_object_t (io_thread_),
+    addr (addr_),
+    s (retired_fd),
+    handle_valid (false),
+    delayed_start (delayed_start_),
+    timer_started (false),
+    session (session_),
+    current_reconnect_ivl (options.reconnect_ivl)
+{
+    zmq_assert (addr);
+    zmq_assert (addr->protocol == "vmci");
+    addr->to_string (endpoint);
+    socket = session->get_socket ();
+}
+
+zmq::vmci_connecter_t::~vmci_connecter_t ()
+{
+    zmq_assert (!timer_started);
+    zmq_assert (!handle_valid);
+    zmq_assert (s == retired_fd);
+}
+
+void zmq::vmci_connecter_t::process_plug ()
+{
+    if (delayed_start)
+        add_reconnect_timer ();
+    else
+        start_connecting ();
+}
+
+void zmq::vmci_connecter_t::process_term (int linger_)
+{
+    if (timer_started) {
+        cancel_timer (reconnect_timer_id);
+        timer_started = false;
+    }
+
+    if (handle_valid) {
+        rm_fd (handle);
+        handle_valid = false;
+    }
+
+    if (s != retired_fd)
+        close ();
+
+    own_t::process_term (linger_);
+}
+
+void zmq::vmci_connecter_t::in_event ()
+{
+    //  We are not polling for incoming 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::vmci_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 ();
+        add_reconnect_timer ();
+        return;
+    }
+
+    tune_vmci_buffer_size (this->get_ctx (), fd, options.vmci_buffer_size,
+                           options.vmci_buffer_min_size,
+                           options.vmci_buffer_max_size);
+
+    if (options.vmci_connect_timeout > 0) {
+#if defined ZMQ_HAVE_WINDOWS
+        tune_vmci_connect_timeout (this->get_ctx (), fd,
+                                   options.vmci_connect_timeout);
+#else
+        struct timeval timeout = {0, options.vmci_connect_timeout * 1000};
+        tune_vmci_connect_timeout (this->get_ctx (), fd, timeout);
+#endif
+    }
+
+    //  Create the engine object for this connection.
+    stream_engine_t *engine = new (std::nothrow) stream_engine_t (
+      fd, options, make_unconnected_bind_endpoint_pair (endpoint));
+    alloc_assert (engine);
+
+    //  Attach the engine to the corresponding session object.
+    send_attach (session, engine);
+
+    //  Shut the connecter down.
+    terminate ();
+
+    socket->event_connected (make_unconnected_bind_endpoint_pair (endpoint),
+                             fd);
+}
+
+void zmq::vmci_connecter_t::timer_event (int id_)
+{
+    zmq_assert (id_ == reconnect_timer_id);
+    timer_started = false;
+    start_connecting ();
+}
+
+void zmq::vmci_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 ();
+    }
+
+    //  Handle any other error condition by eventual reconnect.
+    else {
+        if (s != retired_fd)
+            close ();
+        add_reconnect_timer ();
+    }
+}
+
+void zmq::vmci_connecter_t::add_reconnect_timer ()
+{
+    if (options.reconnect_ivl > 0) {
+        int rc_ivl = get_new_reconnect_ivl ();
+        add_timer (rc_ivl, reconnect_timer_id);
+        socket->event_connect_retried (
+          make_unconnected_bind_endpoint_pair (endpoint), rc_ivl);
+        timer_started = true;
+    }
+}
+
+int zmq::vmci_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;
+}
+
+int zmq::vmci_connecter_t::open ()
+{
+    zmq_assert (s == retired_fd);
+
+    int family = this->get_ctx ()->get_vmci_socket_family ();
+    if (family == -1)
+        return -1;
+
+    //  Create the socket.
+    s = open_socket (family, SOCK_STREAM, 0);
+#ifdef ZMQ_HAVE_WINDOWS
+    if (s == INVALID_SOCKET) {
+        errno = wsa_error_to_errno (WSAGetLastError ());
+        return -1;
+    }
+#else
+    if (s == -1)
+        return -1;
+#endif
+
+    //  Connect to the remote peer.
+    int rc = ::connect (s, addr->resolved.vmci_addr->addr (),
+                        addr->resolved.vmci_addr->addrlen ());
+
+    //  Connect was successful immediately.
+    if (rc == 0)
+        return 0;
+
+    //  Forward the error.
+    return -1;
+}
+
+void zmq::vmci_connecter_t::close ()
+{
+    zmq_assert (s != retired_fd);
+#ifdef ZMQ_HAVE_WINDOWS
+    const int rc = closesocket (s);
+    wsa_assert (rc != SOCKET_ERROR);
+#else
+    const int rc = ::close (s);
+    errno_assert (rc == 0);
+#endif
+    socket->event_closed (make_unconnected_bind_endpoint_pair (endpoint), s);
+    s = retired_fd;
+}
+
+zmq::fd_t zmq::vmci_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);
+
+    //  Assert if the error was caused by 0MQ bug.
+    //  Networking problems are OK. No need to assert.
+#ifdef ZMQ_HAVE_WINDOWS
+    zmq_assert (rc == 0);
+    if (err != 0) {
+        if (err != WSAECONNREFUSED && err != WSAETIMEDOUT
+            && err != WSAECONNABORTED && err != WSAEHOSTUNREACH
+            && err != WSAENETUNREACH && err != WSAENETDOWN && err != WSAEACCES
+            && err != WSAEINVAL && err != WSAEADDRINUSE
+            && err != WSAECONNRESET) {
+            wsa_assert_no (err);
+        }
+        return retired_fd;
+    }
+#else
+    //  Following code should handle both Berkeley-derived socket
+    //  implementations and Solaris.
+    if (rc == -1)
+        err = errno;
+    if (err != 0) {
+        errno = err;
+        errno_assert (errno == ECONNREFUSED || errno == ECONNRESET
+                      || errno == ETIMEDOUT || errno == EHOSTUNREACH
+                      || errno == ENETUNREACH || errno == ENETDOWN
+                      || errno == EINVAL);
+        return retired_fd;
+    }
+#endif
+
+    fd_t result = s;
+    s = retired_fd;
+    return result;
+}
+
+#endif