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 <gio/gsimpleasyncresult.h>
  31 #include <gio/gcancellable.h>
  32 #include <gio/gioerror.h>
  33
  34
  35 #define g_socket_input_stream_get_type _g_socket_input_stream_get_type
  36 G_DEFINE_TYPE (GSocketInputStream, g_socket_input_stream, G_TYPE_INPUT_STREAM);
  37
  38 enum
  39 {
  40   PROP_0,
  41   PROP_SOCKET
  42 };
  43
  44 struct _GSocketInputStreamPrivate
  45 {
  46   GSocket *socket;
  47
  48   /* pending operation metadata */
  49   GSimpleAsyncResult *result;
  50   GCancellable *cancellable;
  51   gpointer buffer;
  52   gsize count;
  53 };
  54
  55 static void
  56 g_socket_input_stream_get_property (GObject    *object,
  57                                     guint       prop_id,
  58                                     GValue     *value,
  59                                     GParamSpec *pspec)
  60 {
  61   GSocketInputStream *stream = G_SOCKET_INPUT_STREAM (object);
  62
  63   switch (prop_id)
  64     {
  65       case PROP_SOCKET:
  66         g_value_set_object (value, stream->priv->socket);
  67         break;
  68
  69       default:
  70         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  71     }
  72 }
  73
  74 static void
  75 g_socket_input_stream_set_property (GObject      *object,
  76                                     guint         prop_id,
  77                                     const GValue *value,
  78                                     GParamSpec   *pspec)
  79 {
  80   GSocketInputStream *stream = G_SOCKET_INPUT_STREAM (object);
  81
  82   switch (prop_id)
  83     {
  84       case PROP_SOCKET:
  85         stream->priv->socket = g_value_dup_object (value);
  86         break;
  87
  88       default:
  89         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  90     }
  91 }
  92
  93 static void
  94 g_socket_input_stream_finalize (GObject *object)
  95 {
  96   GSocketInputStream *stream = G_SOCKET_INPUT_STREAM (object);
  97
  98   if (stream->priv->socket)
  99     g_object_unref (stream->priv->socket);
 100
 101   if (G_OBJECT_CLASS (g_socket_input_stream_parent_class)->finalize)
 102     (*G_OBJECT_CLASS (g_socket_input_stream_parent_class)->finalize) (object);
 103 }
 104
 105 static gssize
 106 g_socket_input_stream_read (GInputStream  *stream,
 107                             void          *buffer,
 108                             gsize          count,
 109                             GCancellable  *cancellable,
 110                             GError       **error)
 111 {
 112   GSocketInputStream *input_stream = G_SOCKET_INPUT_STREAM (stream);
 113
 114   return g_socket_receive (input_stream->priv->socket, buffer, count,
 115                            cancellable, error);
 116 }
 117
 118 static gboolean
 119 g_socket_input_stream_read_ready (GSocket *socket,
 120                                   GIOCondition condition,
 121                                   GSocketInputStream *stream)
 122 {
 123   GSimpleAsyncResult *simple;
 124   GError *error = NULL;
 125   gssize result;
 126
 127   result = g_socket_receive (stream->priv->socket,
 128                              stream->priv->buffer,
 129                              stream->priv->count,
 130                              stream->priv->cancellable,
 131                              &error);
 132
 133   if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
 134     return TRUE;
 135
 136   simple = stream->priv->result;
 137   stream->priv->result = NULL;
 138
 139   if (result >= 0)
 140     g_simple_async_result_set_op_res_gssize (simple, result);
 141
 142   if (error)
 143     {
 144       g_simple_async_result_set_from_error (simple, error);
 145       g_error_free (error);
 146     }
 147
 148   if (stream->priv->cancellable)
 149     g_object_unref (stream->priv->cancellable);
 150
 151   g_simple_async_result_complete (simple);
 152   g_object_unref (simple);
 153
 154   return FALSE;
 155 }
 156
 157 static void
 158 g_socket_input_stream_read_async (GInputStream        *stream,
 159                                   void                *buffer,
 160                                   gsize                count,
 161                                   gint                 io_priority,
 162                                   GCancellable        *cancellable,
 163                                   GAsyncReadyCallback  callback,
 164                                   gpointer             user_data)
 165 {
 166   GSocketInputStream *input_stream = G_SOCKET_INPUT_STREAM (stream);
 167   GSource *source;
 168
 169   g_assert (input_stream->priv->result == NULL);
 170
 171   input_stream->priv->result =
 172     g_simple_async_result_new (G_OBJECT (stream), callback, user_data,
 173                                g_socket_input_stream_read_async);
 174   if (cancellable)
 175     g_object_ref (cancellable);
 176   input_stream->priv->cancellable = cancellable;
 177   input_stream->priv->buffer = buffer;
 178   input_stream->priv->count = count;
 179
 180   source = g_socket_create_source (input_stream->priv->socket,
 181                                    G_IO_IN | G_IO_HUP | G_IO_ERR,
 182                                    cancellable);
 183   g_source_set_callback (source,
 184                          (GSourceFunc) g_socket_input_stream_read_ready,
 185                          g_object_ref (input_stream), g_object_unref);
 186   g_source_attach (source, g_main_context_get_thread_default ());
 187   g_source_unref (source);
 188 }
 189
 190 static gssize
 191 g_socket_input_stream_read_finish (GInputStream  *stream,
 192                                    GAsyncResult  *result,
 193                                    GError       **error)
 194 {
 195   GSimpleAsyncResult *simple;
 196   gssize count;
 197
 198   g_return_val_if_fail (G_IS_SOCKET_INPUT_STREAM (stream), -1);
 199
 200   simple = G_SIMPLE_ASYNC_RESULT (result);
 201
 202   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_socket_input_stream_read_async);
 203
 204   count = g_simple_async_result_get_op_res_gssize (simple);
 205
 206   return count;
 207 }
 208
 209 static void
 210 g_socket_input_stream_class_init (GSocketInputStreamClass *klass)
 211 {
 212   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 213   GInputStreamClass *ginputstream_class = G_INPUT_STREAM_CLASS (klass);
 214
 215   g_type_class_add_private (klass, sizeof (GSocketInputStreamPrivate));
 216
 217   gobject_class->finalize = g_socket_input_stream_finalize;
 218   gobject_class->get_property = g_socket_input_stream_get_property;
 219   gobject_class->set_property = g_socket_input_stream_set_property;
 220
 221   ginputstream_class->read_fn = g_socket_input_stream_read;
 222   ginputstream_class->read_async = g_socket_input_stream_read_async;
 223   ginputstream_class->read_finish = g_socket_input_stream_read_finish;
 224
 225   g_object_class_install_property (gobject_class, PROP_SOCKET,
 226                                    g_param_spec_object ("socket",
 227                                                         P_("socket"),
 228                                                         P_("The socket that this stream wraps"),
 229                                                         G_TYPE_SOCKET, G_PARAM_CONSTRUCT_ONLY |
 230                                                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 231 }
 232
 233 static void
 234 g_socket_input_stream_init (GSocketInputStream *stream)
 235 {
 236   stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream, G_TYPE_SOCKET_INPUT_STREAM, GSocketInputStreamPrivate);
 237 }
 238
 239 GSocketInputStream *
 240 _g_socket_input_stream_new (GSocket *socket)
 241 {
 242   return G_SOCKET_INPUT_STREAM (g_object_new (G_TYPE_SOCKET_INPUT_STREAM, "socket", socket, NULL));
 243 }