gio/gsocketinputstream.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright © 2008 Christian Kellner, Samuel Cormier-Iijima
   4  *           © 2009 codethink
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this library; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  *
  21  * Authors: Christian Kellner <gicmo@gnome.org>
  22  *          Samuel Cormier-Iijima <sciyoshi@gmail.com>
  23  *          Ryan Lortie <desrt@desrt.ca>
  24  */
  25
  26 #include "config.h"
  27 #include "gsocketinputstream.h"
  28 #include "glibintl.h"
  29
  30 #include "gsimpleasyncresult.h"
  31 #include "gcancellable.h"
  32 #include "gpollableinputstream.h"
  33 #include "gioerror.h"
  34 #include "gfiledescriptorbased.h"
  35
  36 static void g_socket_input_stream_pollable_iface_init (GPollableInputStreamInterface *iface);
  37 #ifdef G_OS_UNIX
  38 static void g_socket_input_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface);
  39 #endif
  40
  41 #define g_socket_input_stream_get_type _g_socket_input_stream_get_type
  42
  43 #ifdef G_OS_UNIX
  44 G_DEFINE_TYPE_WITH_CODE (GSocketInputStream, g_socket_input_stream, G_TYPE_INPUT_STREAM,
  45                          G_IMPLEMENT_INTERFACE (G_TYPE_POLLABLE_INPUT_STREAM, g_socket_input_stream_pollable_iface_init)
  46                          G_IMPLEMENT_INTERFACE (G_TYPE_FILE_DESCRIPTOR_BASED, g_socket_input_stream_file_descriptor_based_iface_init)
  47                          )
  48 #else
  49 G_DEFINE_TYPE_WITH_CODE (GSocketInputStream, g_socket_input_stream, G_TYPE_INPUT_STREAM,
  50                          G_IMPLEMENT_INTERFACE (G_TYPE_POLLABLE_INPUT_STREAM, g_socket_input_stream_pollable_iface_init)
  51                          )
  52 #endif
  53
  54 enum
  55 {
  56   PROP_0,
  57   PROP_SOCKET
  58 };
  59
  60 struct _GSocketInputStreamPrivate
  61 {
  62   GSocket *socket;
  63
  64   /* pending operation metadata */
  65   GSimpleAsyncResult *result;
  66   GCancellable *cancellable;
  67   gpointer buffer;
  68   gsize count;
  69 };
  70
  71 static void
  72 g_socket_input_stream_get_property (GObject    *object,
  73                                     guint       prop_id,
  74                                     GValue     *value,
  75                                     GParamSpec *pspec)
  76 {
  77   GSocketInputStream *stream = G_SOCKET_INPUT_STREAM (object);
  78
  79   switch (prop_id)
  80     {
  81       case PROP_SOCKET:
  82         g_value_set_object (value, stream->priv->socket);
  83         break;
  84
  85       default:
  86         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  87     }
  88 }
  89
  90 static void
  91 g_socket_input_stream_set_property (GObject      *object,
  92                                     guint         prop_id,
  93                                     const GValue *value,
  94                                     GParamSpec   *pspec)
  95 {
  96   GSocketInputStream *stream = G_SOCKET_INPUT_STREAM (object);
  97
  98   switch (prop_id)
  99     {
 100       case PROP_SOCKET:
 101         stream->priv->socket = g_value_dup_object (value);
 102         break;
 103
 104       default:
 105         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 106     }
 107 }
 108
 109 static void
 110 g_socket_input_stream_finalize (GObject *object)
 111 {
 112   GSocketInputStream *stream = G_SOCKET_INPUT_STREAM (object);
 113
 114   if (stream->priv->socket)
 115     g_object_unref (stream->priv->socket);
 116
 117   if (G_OBJECT_CLASS (g_socket_input_stream_parent_class)->finalize)
 118     (*G_OBJECT_CLASS (g_socket_input_stream_parent_class)->finalize) (object);
 119 }
 120
 121 static gssize
 122 g_socket_input_stream_read (GInputStream  *stream,
 123                             void          *buffer,
 124                             gsize          count,
 125                             GCancellable  *cancellable,
 126                             GError       **error)
 127 {
 128   GSocketInputStream *input_stream = G_SOCKET_INPUT_STREAM (stream);
 129
 130   return g_socket_receive_with_blocking (input_stream->priv->socket,
 131                                          buffer, count, TRUE,
 132                                          cancellable, error);
 133 }
 134
 135 static gboolean
 136 g_socket_input_stream_read_ready (GSocket *socket,
 137                                   GIOCondition condition,
 138                                   GSocketInputStream *stream)
 139 {
 140   GSimpleAsyncResult *simple;
 141   GError *error = NULL;
 142   gssize result;
 143
 144   result = g_socket_receive_with_blocking (stream->priv->socket,
 145                                            stream->priv->buffer,
 146                                            stream->priv->count,
 147                                            FALSE,
 148                                            stream->priv->cancellable,
 149                                            &error);
 150
 151   if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
 152     return TRUE;
 153
 154   simple = stream->priv->result;
 155   stream->priv->result = NULL;
 156
 157   if (result >= 0)
 158     g_simple_async_result_set_op_res_gssize (simple, result);
 159
 160   if (error)
 161     g_simple_async_result_take_error (simple, error);
 162
 163   if (stream->priv->cancellable)
 164     g_object_unref (stream->priv->cancellable);
 165
 166   g_simple_async_result_complete (simple);
 167   g_object_unref (simple);
 168
 169   return FALSE;
 170 }
 171
 172 static void
 173 g_socket_input_stream_read_async (GInputStream        *stream,
 174                                   void                *buffer,
 175                                   gsize                count,
 176                                   gint                 io_priority,
 177                                   GCancellable        *cancellable,
 178                                   GAsyncReadyCallback  callback,
 179                                   gpointer             user_data)
 180 {
 181   GSocketInputStream *input_stream = G_SOCKET_INPUT_STREAM (stream);
 182   GSource *source;
 183
 184   g_assert (input_stream->priv->result == NULL);
 185
 186   input_stream->priv->result =
 187     g_simple_async_result_new (G_OBJECT (stream), callback, user_data,
 188                                g_socket_input_stream_read_async);
 189   if (cancellable)
 190     g_object_ref (cancellable);
 191   input_stream->priv->cancellable = cancellable;
 192   input_stream->priv->buffer = buffer;
 193   input_stream->priv->count = count;
 194
 195   source = g_socket_create_source (input_stream->priv->socket,
 196                                    G_IO_IN | G_IO_HUP | G_IO_ERR,
 197                                    cancellable);
 198   g_source_set_callback (source,
 199                          (GSourceFunc) g_socket_input_stream_read_ready,
 200                          g_object_ref (input_stream), g_object_unref);
 201   g_source_attach (source, g_main_context_get_thread_default ());
 202   g_source_unref (source);
 203 }
 204
 205 static gssize
 206 g_socket_input_stream_read_finish (GInputStream  *stream,
 207                                    GAsyncResult  *result,
 208                                    GError       **error)
 209 {
 210   GSimpleAsyncResult *simple;
 211   gssize count;
 212
 213   g_return_val_if_fail (G_IS_SOCKET_INPUT_STREAM (stream), -1);
 214
 215   simple = G_SIMPLE_ASYNC_RESULT (result);
 216
 217   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_socket_input_stream_read_async);
 218
 219   count = g_simple_async_result_get_op_res_gssize (simple);
 220
 221   return count;
 222 }
 223
 224 static gboolean
 225 g_socket_input_stream_pollable_is_readable (GPollableInputStream *pollable)
 226 {
 227   GSocketInputStream *input_stream = G_SOCKET_INPUT_STREAM (pollable);
 228
 229   return g_socket_condition_check (input_stream->priv->socket, G_IO_IN);
 230 }
 231
 232 static GSource *
 233 g_socket_input_stream_pollable_create_source (GPollableInputStream *pollable,
 234                                               GCancellable         *cancellable)
 235 {
 236   GSocketInputStream *input_stream = G_SOCKET_INPUT_STREAM (pollable);
 237   GSource *socket_source, *pollable_source;
 238
 239   pollable_source = g_pollable_source_new (G_OBJECT (input_stream));
 240   socket_source = g_socket_create_source (input_stream->priv->socket,
 241                                           G_IO_IN, cancellable);
 242   g_source_set_dummy_callback (socket_source);
 243   g_source_add_child_source (pollable_source, socket_source);
 244   g_source_unref (socket_source);
 245
 246   return pollable_source;
 247 }
 248
 249 static gssize
 250 g_socket_input_stream_pollable_read_nonblocking (GPollableInputStream  *pollable,
 251                                                  void                  *buffer,
 252                                                  gsize                  size,
 253                                                  GError               **error)
 254 {
 255   GSocketInputStream *input_stream = G_SOCKET_INPUT_STREAM (pollable);
 256
 257   return g_socket_receive_with_blocking (input_stream->priv->socket,
 258                                          buffer, size, FALSE,
 259                                          NULL, error);
 260 }
 261
 262 #ifdef G_OS_UNIX
 263 static int
 264 g_socket_input_stream_get_fd (GFileDescriptorBased *fd_based)
 265 {
 266   GSocketInputStream *input_stream = G_SOCKET_INPUT_STREAM (fd_based);
 267
 268   return g_socket_get_fd (input_stream->priv->socket);
 269 }
 270 #endif
 271
 272 static void
 273 g_socket_input_stream_class_init (GSocketInputStreamClass *klass)
 274 {
 275   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 276   GInputStreamClass *ginputstream_class = G_INPUT_STREAM_CLASS (klass);
 277
 278   g_type_class_add_private (klass, sizeof (GSocketInputStreamPrivate));
 279
 280   gobject_class->finalize = g_socket_input_stream_finalize;
 281   gobject_class->get_property = g_socket_input_stream_get_property;
 282   gobject_class->set_property = g_socket_input_stream_set_property;
 283
 284   ginputstream_class->read_fn = g_socket_input_stream_read;
 285   ginputstream_class->read_async = g_socket_input_stream_read_async;
 286   ginputstream_class->read_finish = g_socket_input_stream_read_finish;
 287
 288   g_object_class_install_property (gobject_class, PROP_SOCKET,
 289                                    g_param_spec_object ("socket",
 290                                                         P_("socket"),
 291                                                         P_("The socket that this stream wraps"),
 292                                                         G_TYPE_SOCKET, G_PARAM_CONSTRUCT_ONLY |
 293                                                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 294 }
 295
 296 #ifdef G_OS_UNIX
 297 static void
 298 g_socket_input_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface)
 299 {
 300   iface->get_fd = g_socket_input_stream_get_fd;
 301 }
 302 #endif
 303
 304 static void
 305 g_socket_input_stream_pollable_iface_init (GPollableInputStreamInterface *iface)
 306 {
 307   iface->is_readable = g_socket_input_stream_pollable_is_readable;
 308   iface->create_source = g_socket_input_stream_pollable_create_source;
 309   iface->read_nonblocking = g_socket_input_stream_pollable_read_nonblocking;
 310 }
 311
 312 static void
 313 g_socket_input_stream_init (GSocketInputStream *stream)
 314 {
 315   stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream, G_TYPE_SOCKET_INPUT_STREAM, GSocketInputStreamPrivate);
 316 }
 317
 318 GSocketInputStream *
 319 _g_socket_input_stream_new (GSocket *socket)
 320 {
 321   return G_SOCKET_INPUT_STREAM (g_object_new (G_TYPE_SOCKET_INPUT_STREAM, "socket", socket, NULL));
 322 }