glib/gio/gsocketconnectable.c
2015-10-25 19:43:54 +01:00

180 lines
5.3 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2008 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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 library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gsocketconnectable.h"
#include "glibintl.h"
/**
* SECTION:gsocketconnectable
* @short_description: Interface for potential socket endpoints
* @include: gio/gio.h
*
* Objects that describe one or more potential socket endpoints
* implement #GSocketConnectable. Callers can then use
* g_socket_connectable_enumerate() to get a #GSocketAddressEnumerator
* to try out each socket address in turn until one succeeds, as shown
* in the sample code below.
*
* |[<!-- language="C" -->
* MyConnectionType *
* connect_to_host (const char *hostname,
* guint16 port,
* GCancellable *cancellable,
* GError **error)
* {
* MyConnection *conn = NULL;
* GSocketConnectable *addr;
* GSocketAddressEnumerator *enumerator;
* GSocketAddress *sockaddr;
* GError *conn_error = NULL;
*
* addr = g_network_address_new (hostname, port);
* enumerator = g_socket_connectable_enumerate (addr);
* g_object_unref (addr);
*
* // Try each sockaddr until we succeed. Record the first connection error,
* // but not any further ones (since they'll probably be basically the same
* // as the first).
* while (!conn && (sockaddr = g_socket_address_enumerator_next (enumerator, cancellable, error))
* {
* conn = connect_to_sockaddr (sockaddr, conn_error ? NULL : &conn_error);
* g_object_unref (sockaddr);
* }
* g_object_unref (enumerator);
*
* if (conn)
* {
* if (conn_error)
* {
* // We couldn't connect to the first address, but we succeeded
* // in connecting to a later address.
* g_error_free (conn_error);
* }
* return conn;
* }
* else if (error)
* {
* /// Either initial lookup failed, or else the caller cancelled us.
* if (conn_error)
* g_error_free (conn_error);
* return NULL;
* }
* else
* {
* g_error_propagate (error, conn_error);
* return NULL;
* }
* }
* ]|
*/
typedef GSocketConnectableIface GSocketConnectableInterface;
G_DEFINE_INTERFACE (GSocketConnectable, g_socket_connectable, G_TYPE_OBJECT)
static void
g_socket_connectable_default_init (GSocketConnectableInterface *iface)
{
}
/**
* g_socket_connectable_enumerate:
* @connectable: a #GSocketConnectable
*
* Creates a #GSocketAddressEnumerator for @connectable.
*
* Returns: (transfer full): a new #GSocketAddressEnumerator.
*
* Since: 2.22
*/
GSocketAddressEnumerator *
g_socket_connectable_enumerate (GSocketConnectable *connectable)
{
GSocketConnectableIface *iface;
g_return_val_if_fail (G_IS_SOCKET_CONNECTABLE (connectable), NULL);
iface = G_SOCKET_CONNECTABLE_GET_IFACE (connectable);
return (* iface->enumerate) (connectable);
}
/**
* g_socket_connectable_proxy_enumerate:
* @connectable: a #GSocketConnectable
*
* Creates a #GSocketAddressEnumerator for @connectable that will
* return #GProxyAddresses for addresses that you must connect
* to via a proxy.
*
* If @connectable does not implement
* g_socket_connectable_proxy_enumerate(), this will fall back to
* calling g_socket_connectable_enumerate().
*
* Returns: (transfer full): a new #GSocketAddressEnumerator.
*
* Since: 2.26
*/
GSocketAddressEnumerator *
g_socket_connectable_proxy_enumerate (GSocketConnectable *connectable)
{
GSocketConnectableIface *iface;
g_return_val_if_fail (G_IS_SOCKET_CONNECTABLE (connectable), NULL);
iface = G_SOCKET_CONNECTABLE_GET_IFACE (connectable);
if (iface->proxy_enumerate)
return (* iface->proxy_enumerate) (connectable);
else
return (* iface->enumerate) (connectable);
}
/**
* g_socket_connectable_to_string:
* @connectable: a #GSocketConnectable
*
* Format a #GSocketConnectable as a string. This is a human-readable format for
* use in debugging output, and is not a stable serialization format. It is not
* suitable for use in user interfaces as it exposes too much information for a
* user.
*
* If the #GSocketConnectable implementation does not support string formatting,
* the implementations type name will be returned as a fallback.
*
* Returns: (transfer full): the formatted string
*
* Since: 2.48
*/
gchar *
g_socket_connectable_to_string (GSocketConnectable *connectable)
{
GSocketConnectableIface *iface;
g_return_val_if_fail (G_IS_SOCKET_CONNECTABLE (connectable), NULL);
iface = G_SOCKET_CONNECTABLE_GET_IFACE (connectable);
if (iface->to_string != NULL)
return iface->to_string (connectable);
else
return g_strdup (G_OBJECT_TYPE_NAME (connectable));
}