Add socket-client example

1 files changed, 294 insertions, 0 deletions

diff --git a/examples/network/socket-client.cc b/examples/network/socket-client.cc
new file mode 100644
index 00000000..456c18e7
--- /dev/null
+++ b/examples/network/socket-client.cc
@@ -0,0 +1,294 @@
+#include <cstring>
+#include <giomm.h>
+#include <glibmm.h>
+#include <iostream>
+
+Glib::RefPtr<Glib::MainLoop> loop;
+
+gboolean verbose = FALSE;
+gboolean non_blocking = FALSE;
+gboolean use_udp = FALSE;
+gboolean use_source = FALSE;
+int cancel_timeout = 0;
+
+static GOptionEntry cmd_entries[] = {
+  {"cancel", 'c', 0, G_OPTION_ARG_INT, &cancel_timeout,
+   "Cancel any op after the specified amount of seconds", NULL},
+  {"udp", 'u', 0, G_OPTION_ARG_NONE, &use_udp,
+   "Use udp instead of tcp", NULL},
+  {"verbose", 'v', 0, G_OPTION_ARG_NONE, &verbose,
+   "Be verbose", NULL},
+  {"non-blocking", 'n', 0, G_OPTION_ARG_NONE, &non_blocking,
+   "Enable non-blocking i/o", NULL},
+  {"use-source", 's', 0, G_OPTION_ARG_NONE, &use_source,
+   "Use GSource to wait for non-blocking i/o", NULL},
+  {NULL}
+};
+
+Glib::ustring
+socket_address_to_string (const Glib::RefPtr<Gio::SocketAddress>& address)
+{
+    Glib::RefPtr<Gio::InetAddress> inet_address;
+    Glib::ustring str, res;
+    int port;
+
+    Glib::RefPtr<Gio::InetSocketAddress> isockaddr =
+        Glib::RefPtr<Gio::InetSocketAddress>::cast_dynamic (address);
+    if (!isockaddr)
+        return Glib::ustring ();
+    inet_address = isockaddr->get_address ();
+    str = inet_address->to_string ();
+    port = isockaddr->get_port ();
+    res = Glib::ustring::compose ("%1:%2", str, port);
+    return res;
+}
+
+static bool
+source_ready (gpointer data,
+              GIOCondition condition)
+{
+  loop->quit ();
+  return false;
+}
+
+static void
+ensure_condition (const Glib::RefPtr<Gio::Socket>& socket,
+                  const Glib::ustring& where,
+                  const Glib::RefPtr<Gio::Cancellable>& cancellable,
+                  Glib::IOCondition condition)
+{
+    GSource *source;
+
+    if (!non_blocking)
+        return;
+
+    if (use_source)
+    {
+        source = g_socket_create_source (socket->gobj (),
+                                         (GIOCondition) condition,
+                                         cancellable->gobj ());
+        g_source_set_callback (source,
+                               (GSourceFunc) source_ready,
+                               NULL, NULL);
+        g_source_attach (source, NULL);
+        loop->run ();
+    }
+    else
+    {
+        try {
+            socket->condition_wait (condition, cancellable);
+        } catch (const Gio::Error& error)
+        {
+            std::cerr << Glib::ustring::compose("condition wait error for %1: %2\n",
+                        where, error.what ());
+            exit (1);
+        }
+    }
+}
+
+static void
+cancel_thread (Glib::RefPtr<Gio::Cancellable> cancellable)
+{
+    g_usleep (1000*1000*cancel_timeout);
+    std::cout << "Cancelling\n";
+    cancellable->cancel ();
+}
+
+int
+main (int argc,
+      char *argv[])
+{
+    Glib::RefPtr<Gio::Socket> socket;
+    Glib::RefPtr<Gio::SocketAddress> src_address;
+    Glib::RefPtr<Gio::SocketAddress> address;
+    Gio::SocketType socket_type;
+    GError *error = NULL;
+    GOptionContext *context;
+    Glib::RefPtr<Gio::Cancellable> cancellable;
+    Glib::RefPtr<Gio::SocketAddressEnumerator> enumerator;
+    Glib::RefPtr<Gio::SocketConnectable> connectable;
+
+    Glib::thread_init (NULL);
+
+    Gio::init ();
+
+    context = g_option_context_new (" <hostname>[:port] - Test GSocket client stuff");
+    g_option_context_add_main_entries (context, cmd_entries, NULL);
+    if (!g_option_context_parse (context, &argc, &argv, &error))
+    {
+        std::cerr << Glib::ustring::compose ("%1: %2\n", argv[0], error->message);
+        return 1;
+    }
+
+    if (argc != 2)
+    {
+        std::cerr << Glib::ustring::compose ("%1: %2\n", argv[0], "Need to specify hostname");
+        return 1;
+    }
+
+    if (cancel_timeout)
+    {
+        cancellable = Gio::Cancellable::create ();
+        Glib::Thread::create (sigc::bind (sigc::ptr_fun (cancel_thread), cancellable), false);
+    }
+
+    loop = Glib::MainLoop::create ();
+
+    if (use_udp)
+        socket_type = Gio::SOCKET_TYPE_DATAGRAM;
+    else
+        socket_type = Gio::SOCKET_TYPE_STREAM;
+
+    try {
+#warning "Gio::SocketFamily bug"
+        socket = Gio::Socket::create ((Gio::SocketFamily)G_SOCKET_FAMILY_IPV4, socket_type, Gio::SOCKET_PROTOCOL_DEFAULT);
+    } catch (const Gio::Error& error)
+    {
+        std::cerr << Glib::ustring::compose ("%1: %2\n", argv[0], error.what ());
+        return 1;
+    }
+
+    try {
+        connectable = Gio::NetworkAddress::parse (argv[1], 7777);
+    } catch (const Gio::Error& error)
+    {
+        std::cerr << Glib::ustring::compose ("%1: %2\n", argv[0], error.what ());
+        return 1;
+    }
+
+    enumerator = connectable->enumerate ();
+    while (true)
+    {
+        try {
+            address = enumerator->next (cancellable);
+            if (!address) {
+                std::cerr << Glib::ustring::compose ("%1: No more addresses to try\n", argv[0]);
+                return 1;
+            }
+        } catch (const Gio::Error& error)
+        {
+            std::cerr << Glib::ustring::compose ("%1: %2\n", argv[0], error.what ());
+            return 1;
+        }
+
+        try {
+            socket->connect (address, cancellable);
+            break;
+        } catch (const Gio::Error& error)
+        {
+            std::cerr << Glib::ustring::compose ("%1: Connection to %2 failed: %3, trying next\n",
+                                                 argv[0], socket_address_to_string (address),
+                                                 error.what ());
+        }
+    }
+
+    std::cout << Glib::ustring::compose ("Connected to %1\n",
+                                         socket_address_to_string (address));
+
+    /* TODO: Test non-blocking connect */
+    if (non_blocking)
+        socket->set_blocking (false);
+
+    try {
+        src_address = socket->get_local_address ();
+    } catch (const Gio::Error& error)
+    {
+        std::cerr << Glib::ustring::compose ("Error getting local address: %1\n",
+                    error.what ());
+        return 1;
+    }
+    std::cout << Glib::ustring::compose ("local address: %1\n",
+                                         socket_address_to_string (src_address));
+
+    while (true)
+    {
+        gchar buffer[4096] = { };
+        gssize size;
+        gsize to_send;
+
+        if (!std::cin.getline (buffer, sizeof buffer - 1))
+            break;
+
+        to_send = strlen (buffer);
+        buffer[to_send++] = '\n';
+        buffer[to_send] = '\0';
+        while (to_send > 0)
+        {
+            ensure_condition (socket, "send", cancellable, Glib::IO_OUT);
+            try {
+                if (use_udp)
+                    size = socket->send_to (address, buffer, to_send,
+                                            cancellable);
+                else
+                    size = socket->send (buffer, to_send, cancellable);
+
+            } catch (const Gio::Error& error)
+            {
+                if (error.code () == Gio::Error::WOULD_BLOCK)
+                {
+                    std::cout << "socket send would block, handling\n";
+                    continue;
+                }
+                else
+                {
+                    std::cerr << Glib::ustring::compose ("Error sending to socket: %1\n",
+                                                         error.what ());
+                    return 1;
+                }
+            }
+
+            std::cout << Glib::ustring::compose ("sent %1 bytes of data\n", size);
+
+            if (size == 0)
+            {
+                std::cerr << "Unexpected short write\n";
+                return 1;
+            }
+
+            to_send -= size;
+        }
+
+        ensure_condition (socket, "receive", cancellable, Glib::IO_IN);
+        try {
+            if (use_udp)
+                size = socket->receive_from (src_address, buffer, sizeof buffer,
+                                             cancellable);
+            else
+                size = socket->receive (buffer, sizeof buffer, cancellable);
+
+        } catch (const Gio::Error& error)
+        {
+            std::cerr << Glib::ustring::compose ("Error receiving from socket: %1\n",
+                                                 error.what ());
+            return 1;
+        }
+
+        if (size == 0)
+            break;
+
+        std::cout << Glib::ustring::compose ("received %1 bytes of data", size);
+        if (use_udp)
+            std::cout << Glib::ustring::compose (" from %1", socket_address_to_string (src_address));
+        std::cout << std::endl;
+
+        if (verbose)
+            g_print ("-------------------------\n"
+                     "%.*s"
+                     "-------------------------\n",
+                     (int)size, buffer);
+
+    }
+
+    std::cout << "closing socket\n";
+
+    try {
+        socket->close ();
+    } catch (const Gio::Error& error)
+    {
+        std::cerr << Glib::ustring::compose ("Error closing master socket: %1\n",
+                                             error.what ());
+        return 1;
+    }
+
+    return 0;
+}