gio/gtcpconnection.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright © 2008, 2009 Codethink Limited
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License as published
   7  * by the Free Software Foundation; either version 2 of the licence or (at
   8  * your option) any later version.
   9  *
  10  * See the included COPYING file for more information.
  11  */
  12
  13 /**
  14  * SECTION: gtcpconnection
  15  * @title: GTcpConnection
  16  * @short_description: A TCP GSocketConnection
  17  * @see_also: #GSocketConnection.
  18  *
  19  * This is the subclass of #GSocketConnection that is created
  20  * for TCP/IP sockets.
  21  *
  22  * Since: 2.22
  23  */
  24
  25 #include "config.h"
  26 #include "gtcpconnection.h"
  27 #include "gasyncresult.h"
  28 #include "gsimpleasyncresult.h"
  29 #include "giostream.h"
  30 #include "glibintl.h"
  31
  32
  33 G_DEFINE_TYPE_WITH_CODE (GTcpConnection, g_tcp_connection,
  34                          G_TYPE_SOCKET_CONNECTION,
  35   g_socket_connection_factory_register_type (g_define_type_id,
  36                                              G_SOCKET_FAMILY_IPV4,
  37                                              G_SOCKET_TYPE_STREAM,
  38                                              G_SOCKET_PROTOCOL_DEFAULT);
  39   g_socket_connection_factory_register_type (g_define_type_id,
  40                                              G_SOCKET_FAMILY_IPV6,
  41                                              G_SOCKET_TYPE_STREAM,
  42                                              G_SOCKET_PROTOCOL_DEFAULT);
  43   g_socket_connection_factory_register_type (g_define_type_id,
  44                                              G_SOCKET_FAMILY_IPV4,
  45                                              G_SOCKET_TYPE_STREAM,
  46                                              G_SOCKET_PROTOCOL_TCP);
  47   g_socket_connection_factory_register_type (g_define_type_id,
  48                                              G_SOCKET_FAMILY_IPV6,
  49                                              G_SOCKET_TYPE_STREAM,
  50                                              G_SOCKET_PROTOCOL_TCP);
  51                          );
  52
  53 static gboolean g_tcp_connection_close       (GIOStream            *stream,
  54                                               GCancellable         *cancellable,
  55                                               GError              **error);
  56 static void     g_tcp_connection_close_async (GIOStream            *stream,
  57                                               int                   io_priority,
  58                                               GCancellable         *cancellable,
  59                                               GAsyncReadyCallback   callback,
  60                                               gpointer              user_data);
  61
  62 struct _GTcpConnectionPrivate
  63 {
  64   guint graceful_disconnect : 1;
  65 };
  66
  67
  68 enum
  69 {
  70   PROP_0,
  71   PROP_GRACEFUL_DISCONNECT
  72 };
  73
  74 static void
  75 g_tcp_connection_init (GTcpConnection *connection)
  76 {
  77   connection->priv = G_TYPE_INSTANCE_GET_PRIVATE (connection,
  78                                                   G_TYPE_TCP_CONNECTION,
  79                                                   GTcpConnectionPrivate);
  80   connection->priv->graceful_disconnect = FALSE;
  81 }
  82
  83 static void
  84 g_tcp_connection_get_property (GObject    *object,
  85                                guint       prop_id,
  86                                GValue     *value,
  87                                GParamSpec *pspec)
  88 {
  89   GTcpConnection *connection = G_TCP_CONNECTION (object);
  90
  91   switch (prop_id)
  92     {
  93       case PROP_GRACEFUL_DISCONNECT:
  94         g_value_set_boolean (value, connection->priv->graceful_disconnect);
  95         break;
  96
  97       default:
  98         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  99     }
 100 }
 101
 102 static void
 103 g_tcp_connection_set_property (GObject      *object,
 104                                guint         prop_id,
 105                                const GValue *value,
 106                                GParamSpec   *pspec)
 107 {
 108   GTcpConnection *connection = G_TCP_CONNECTION (object);
 109
 110   switch (prop_id)
 111     {
 112       case PROP_GRACEFUL_DISCONNECT:
 113         g_tcp_connection_set_graceful_disconnect (connection,
 114                                                   g_value_get_boolean (value));
 115         break;
 116
 117       default:
 118         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 119     }
 120 }
 121
 122 static void
 123 g_tcp_connection_class_init (GTcpConnectionClass *class)
 124 {
 125   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 126   GIOStreamClass *stream_class = G_IO_STREAM_CLASS (class);
 127
 128   g_type_class_add_private (class, sizeof (GTcpConnectionPrivate));
 129
 130   gobject_class->set_property = g_tcp_connection_set_property;
 131   gobject_class->get_property = g_tcp_connection_get_property;
 132
 133   stream_class->close_fn = g_tcp_connection_close;
 134   stream_class->close_async = g_tcp_connection_close_async;
 135
 136   g_object_class_install_property (gobject_class, PROP_GRACEFUL_DISCONNECT,
 137                                    g_param_spec_boolean ("graceful-disconnect",
 138                                                          P_("Graceful Disconnect"),
 139                                                          P_("Whether or not close does a graceful disconnect"),
 140                                                          FALSE,
 141                                                          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 142
 143 }
 144
 145 static gboolean
 146 g_tcp_connection_close (GIOStream     *stream,
 147                         GCancellable  *cancellable,
 148                         GError       **error)
 149 {
 150   GTcpConnection *connection = G_TCP_CONNECTION (stream);
 151   GSocket *socket;
 152   char buffer[1024];
 153   gssize ret;
 154   GError *my_error;
 155   gboolean had_error;
 156
 157   socket = g_socket_connection_get_socket (G_SOCKET_CONNECTION (stream));
 158   had_error = FALSE;
 159
 160   if (connection->priv->graceful_disconnect &&
 161       !g_cancellable_is_cancelled (cancellable) /* Cancelled -> close fast */)
 162     {
 163       if (!g_socket_shutdown (socket, FALSE, TRUE, error))
 164         {
 165           error = NULL; /* Ignore further errors */
 166           had_error = TRUE;
 167         }
 168       else
 169         {
 170           while (TRUE)
 171             {
 172               my_error = NULL;
 173               ret = g_socket_receive (socket,  buffer, sizeof (buffer),
 174                                       cancellable, &my_error);
 175               if (ret < 0)
 176                 {
 177                   if (g_error_matches (my_error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
 178                     g_error_free (my_error);
 179                   else
 180                     {
 181                       had_error = TRUE;
 182                       g_propagate_error (error, my_error);
 183                       error = NULL;
 184                       break;
 185                     }
 186                 }
 187               if (ret == 0)
 188                 break;
 189             }
 190         }
 191     }
 192
 193   return G_IO_STREAM_CLASS (g_tcp_connection_parent_class)
 194     ->close_fn (stream, cancellable, error) && !had_error;
 195 }
 196
 197 typedef struct {
 198   GSimpleAsyncResult *res;
 199   GCancellable *cancellable;
 200 } CloseAsyncData;
 201
 202 static void
 203 close_async_data_free (CloseAsyncData *data)
 204 {
 205   g_object_unref (data->res);
 206   if (data->cancellable)
 207     g_object_unref (data->cancellable);
 208   g_free (data);
 209 }
 210
 211 static void
 212 async_close_finish (CloseAsyncData *data,
 213                     GError         *error /* consumed */,
 214                     gboolean        in_mainloop)
 215 {
 216   GIOStreamClass *parent = G_IO_STREAM_CLASS (g_tcp_connection_parent_class);
 217   GIOStream *stream;
 218   GError *my_error;
 219
 220   stream = G_IO_STREAM (g_async_result_get_source_object (G_ASYNC_RESULT (data->res)));
 221
 222   /* Doesn't block, ignore error */
 223   if (error)
 224     {
 225       parent->close_fn (stream, data->cancellable, NULL);
 226       g_simple_async_result_take_error (data->res, error);
 227     }
 228   else
 229     {
 230       my_error = NULL;
 231       parent->close_fn (stream, data->cancellable, &my_error);
 232       if (my_error)
 233         g_simple_async_result_take_error (data->res, my_error);
 234     }
 235
 236   if (in_mainloop)
 237     g_simple_async_result_complete (data->res);
 238   else
 239     g_simple_async_result_complete_in_idle (data->res);
 240 }
 241
 242 static gboolean
 243 close_read_ready (GSocket        *socket,
 244                   GIOCondition    condition,
 245                   CloseAsyncData *data)
 246 {
 247   GError *error = NULL;
 248   char buffer[1024];
 249   gssize ret;
 250
 251   ret = g_socket_receive (socket,  buffer, sizeof (buffer),
 252                           data->cancellable, &error);
 253   if (ret < 0)
 254     {
 255       if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
 256         g_error_free (error);
 257       else
 258         {
 259           async_close_finish (data, error, TRUE);
 260           return FALSE;
 261         }
 262     }
 263
 264   if (ret == 0)
 265     {
 266       async_close_finish (data, NULL, TRUE);
 267       return FALSE;
 268     }
 269
 270   return TRUE;
 271 }
 272
 273
 274 static void
 275 g_tcp_connection_close_async (GIOStream           *stream,
 276                               int                  io_priority,
 277                               GCancellable        *cancellable,
 278                               GAsyncReadyCallback  callback,
 279                               gpointer             user_data)
 280 {
 281   GTcpConnection *connection = G_TCP_CONNECTION (stream);
 282   CloseAsyncData *data;
 283   GSocket *socket;
 284   GSource *source;
 285   GError *error;
 286
 287   if (connection->priv->graceful_disconnect &&
 288       !g_cancellable_is_cancelled (cancellable) /* Cancelled -> close fast */)
 289     {
 290       data = g_new (CloseAsyncData, 1);
 291       data->res =
 292         g_simple_async_result_new (G_OBJECT (stream), callback, user_data,
 293                                    g_tcp_connection_close_async);
 294       if (cancellable)
 295         data->cancellable = g_object_ref (cancellable);
 296       else
 297         data->cancellable = NULL;
 298
 299       socket = g_socket_connection_get_socket (G_SOCKET_CONNECTION (stream));
 300
 301       error = NULL;
 302       if (!g_socket_shutdown (socket, FALSE, TRUE, &error))
 303         {
 304           async_close_finish (data, error, FALSE);
 305           close_async_data_free (data);
 306           return;
 307         }
 308
 309       source = g_socket_create_source (socket, G_IO_IN, cancellable);
 310       g_source_set_callback (source,
 311                              (GSourceFunc) close_read_ready,
 312                              data, (GDestroyNotify)close_async_data_free);
 313       g_source_attach (source, g_main_context_get_thread_default ());
 314       g_source_unref (source);
 315
 316       return;
 317     }
 318
 319   G_IO_STREAM_CLASS (g_tcp_connection_parent_class)
 320     ->close_async (stream, io_priority, cancellable, callback, user_data);
 321 }
 322
 323 /**
 324  * g_tcp_connection_set_graceful_disconnect:
 325  * @connection: a #GTcpConnection
 326  * @graceful_disconnect: Whether to do graceful disconnects or not
 327  *
 328  * This enabled graceful disconnects on close. A graceful disconnect
 329  * means that we signal the recieving end that the connection is terminated
 330  * and wait for it to close the connection before closing the connection.
 331  *
 332  * A graceful disconnect means that we can be sure that we successfully sent
 333  * all the outstanding data to the other end, or get an error reported.
 334  * However, it also means we have to wait for all the data to reach the
 335  * other side and for it to acknowledge this by closing the socket, which may
 336  * take a while. For this reason it is disabled by default.
 337  *
 338  * Since: 2.22
 339  */
 340 void
 341 g_tcp_connection_set_graceful_disconnect (GTcpConnection *connection,
 342                                           gboolean        graceful_disconnect)
 343 {
 344   graceful_disconnect = !!graceful_disconnect;
 345   if (graceful_disconnect != connection->priv->graceful_disconnect)
 346     {
 347       connection->priv->graceful_disconnect = graceful_disconnect;
 348       g_object_notify (G_OBJECT (connection), "graceful-disconnect");
 349     }
 350 }
 351
 352 /**
 353  * g_tcp_connection_get_graceful_disconnect:
 354  * @connection: a #GTcpConnection
 355  *
 356  * Checks if graceful disconnects are used. See
 357  * g_tcp_connection_set_graceful_disconnect().
 358  *
 359  * Returns: %TRUE if graceful disconnect is used on close, %FALSE otherwise
 360  *
 361  * Since: 2.22
 362  */
 363 gboolean
 364 g_tcp_connection_get_graceful_disconnect (GTcpConnection *connection)
 365 {
 366   return connection->priv->graceful_disconnect;
 367 }