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glib/gio/gdbusproxy.c
Simon McVittie 7c609f8142 gdbus: Use symbolic constants for interfaces from dbus-specification 
Most D-Bus interfaces are domain-specific, but these interfaces from the
D-Bus Specification are intended to be commonly used in any context for
which they are found to be appropriate.

Most of these use `gdbusprivate.h`. One exception is that
`gio/tests/gdbus-example-*` redefine the constants locally: due to these
files' dual role as part of the unit tests and as sample code, it seems
desirable to ensure that they can still be compiled outside GLib.

Signed-off-by: Simon McVittie <smcv@collabora.com>
2024-05-16 22:52:23 +01:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 2.1 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/>.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "gdbusutils.h"
#include "gdbusproxy.h"
#include "gioenumtypes.h"
#include "gdbusconnection.h"
#include "gdbuserror.h"
#include "gdbusprivate.h"
#include "ginitable.h"
#include "gasyncinitable.h"
#include "gioerror.h"
#include "gtask.h"
#include "gcancellable.h"
#include "gdbusinterface.h"
#include "gasyncresult.h"
#ifdef G_OS_UNIX
#include "gunixfdlist.h"
#endif
#include "glibintl.h"
#include "gmarshal-internal.h"
/**
* GDBusProxy:
*
* `GDBusProxy` is a base class used for proxies to access a D-Bus
* interface on a remote object. A `GDBusProxy` can be constructed for
* both well-known and unique names.
*
* By default, `GDBusProxy` will cache all properties (and listen to
* changes) of the remote object, and proxy all signals that get
* emitted. This behaviour can be changed by passing suitable
* [flags@Gio.DBusProxyFlags] when the proxy is created. If the proxy is for a
* well-known name, the property cache is flushed when the name owner
* vanishes and reloaded when a name owner appears.
*
* The unique name owner of the proxy’s name is tracked and can be read from
* [property@Gio.DBusProxy:g-name-owner]. Connect to the
* [signal@GObject.Object::notify] signal to get notified of changes.
* Additionally, only signals and property changes emitted from the current name
* owner are considered and calls are always sent to the current name owner.
* This avoids a number of race conditions when the name is lost by one owner
* and claimed by another. However, if no name owner currently exists,
* then calls will be sent to the well-known name which may result in
* the message bus launching an owner (unless
* `G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START` is set).
*
* If the proxy is for a stateless D-Bus service, where the name owner may
* be started and stopped between calls, the
* [property@Gio.DBusProxy:g-name-owner] tracking of `GDBusProxy` will cause the
* proxy to drop signal and property changes from the service after it has
* restarted for the first time. When interacting with a stateless D-Bus
* service, do not use `GDBusProxy` — use direct D-Bus method calls and signal
* connections.
*
* The generic [signal@Gio.DBusProxy::g-properties-changed] and
* [signal@Gio.DBusProxy::g-signal] signals are not very convenient to work
* with. Therefore, the recommended way of working with proxies is to subclass
* `GDBusProxy`, and have more natural properties and signals in your derived
* class. This [example](migrating-gdbus.html#using-gdbus-codegen) shows how
* this can easily be done using the [`gdbus-codegen`](gdbus-codegen.html) tool.
*
* A `GDBusProxy` instance can be used from multiple threads but note
* that all signals (e.g. [signal@Gio.DBusProxy::g-signal],
* [signal@Gio.DBusProxy::g-properties-changed] and
* [signal@GObject.Object::notify]) are emitted in the thread-default main
* context (see [method@GLib.MainContext.push_thread_default]) of the thread
* where the instance was constructed.
*
* An example using a proxy for a well-known name can be found in
* [`gdbus-example-watch-proxy.c`](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-watch-proxy.c).
*
* Since: 2.26
*/
/* lock protecting the mutable properties: name_owner, timeout_msec,
* expected_interface, and the properties hash table
*/
G_LOCK_DEFINE_STATIC (properties_lock);
/* ---------------------------------------------------------------------------------------------------- */
static GWeakRef *
weak_ref_new (GObject *object)
{
GWeakRef *weak_ref = g_new0 (GWeakRef, 1);
g_weak_ref_init (weak_ref, object);
return g_steal_pointer (&weak_ref);
}
static void
weak_ref_free (GWeakRef *weak_ref)
{
g_weak_ref_clear (weak_ref);
g_free (weak_ref);
}
/* ---------------------------------------------------------------------------------------------------- */
struct _GDBusProxyPrivate
{
GBusType bus_type;
GDBusProxyFlags flags;
GDBusConnection *connection;
gchar *name;
/* mutable, protected by properties_lock */
gchar *name_owner;
gchar *object_path;
gchar *interface_name;
/* mutable, protected by properties_lock */
gint timeout_msec;
guint name_owner_changed_subscription_id;
GCancellable *get_all_cancellable;
/* gchar* -> GVariant*, protected by properties_lock */
GHashTable *properties;
/* mutable, protected by properties_lock */
GDBusInterfaceInfo *expected_interface;
guint properties_changed_subscription_id;
guint signals_subscription_id;
gboolean initialized;
/* mutable, protected by properties_lock */
GDBusObject *object;
};
enum
{
PROP_0,
PROP_G_CONNECTION,
PROP_G_BUS_TYPE,
PROP_G_NAME,
PROP_G_NAME_OWNER,
PROP_G_FLAGS,
PROP_G_OBJECT_PATH,
PROP_G_INTERFACE_NAME,
PROP_G_DEFAULT_TIMEOUT,
PROP_G_INTERFACE_INFO
};
enum
{
PROPERTIES_CHANGED_SIGNAL,
SIGNAL_SIGNAL,
LAST_SIGNAL,
};
static guint signals[LAST_SIGNAL] = {0};
static void dbus_interface_iface_init (GDBusInterfaceIface *dbus_interface_iface);
static void initable_iface_init (GInitableIface *initable_iface);
static void async_initable_iface_init (GAsyncInitableIface *async_initable_iface);
G_DEFINE_TYPE_WITH_CODE (GDBusProxy, g_dbus_proxy, G_TYPE_OBJECT,
G_ADD_PRIVATE (GDBusProxy)
G_IMPLEMENT_INTERFACE (G_TYPE_DBUS_INTERFACE, dbus_interface_iface_init)
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init)
G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_INITABLE, async_initable_iface_init))
static void
g_dbus_proxy_finalize (GObject *object)
{
GDBusProxy *proxy = G_DBUS_PROXY (object);
g_warn_if_fail (proxy->priv->get_all_cancellable == NULL);
if (proxy->priv->name_owner_changed_subscription_id > 0)
g_dbus_connection_signal_unsubscribe (proxy->priv->connection,
proxy->priv->name_owner_changed_subscription_id);
if (proxy->priv->properties_changed_subscription_id > 0)
g_dbus_connection_signal_unsubscribe (proxy->priv->connection,
proxy->priv->properties_changed_subscription_id);
if (proxy->priv->signals_subscription_id > 0)
g_dbus_connection_signal_unsubscribe (proxy->priv->connection,
proxy->priv->signals_subscription_id);
if (proxy->priv->connection != NULL)
g_object_unref (proxy->priv->connection);
g_free (proxy->priv->name);
g_free (proxy->priv->name_owner);
g_free (proxy->priv->object_path);
g_free (proxy->priv->interface_name);
if (proxy->priv->properties != NULL)
g_hash_table_unref (proxy->priv->properties);
if (proxy->priv->expected_interface != NULL)
{
g_dbus_interface_info_cache_release (proxy->priv->expected_interface);
g_dbus_interface_info_unref (proxy->priv->expected_interface);
}
if (proxy->priv->object != NULL)
g_object_remove_weak_pointer (G_OBJECT (proxy->priv->object), (gpointer *) &proxy->priv->object);
G_OBJECT_CLASS (g_dbus_proxy_parent_class)->finalize (object);
}
static void
g_dbus_proxy_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GDBusProxy *proxy = G_DBUS_PROXY (object);
switch (prop_id)
{
case PROP_G_CONNECTION:
g_value_set_object (value, proxy->priv->connection);
break;
case PROP_G_FLAGS:
g_value_set_flags (value, proxy->priv->flags);
break;
case PROP_G_NAME:
g_value_set_string (value, proxy->priv->name);
break;
case PROP_G_NAME_OWNER:
g_value_take_string (value, g_dbus_proxy_get_name_owner (proxy));
break;
case PROP_G_OBJECT_PATH:
g_value_set_string (value, proxy->priv->object_path);
break;
case PROP_G_INTERFACE_NAME:
g_value_set_string (value, proxy->priv->interface_name);
break;
case PROP_G_DEFAULT_TIMEOUT:
g_value_set_int (value, g_dbus_proxy_get_default_timeout (proxy));
break;
case PROP_G_INTERFACE_INFO:
g_value_set_boxed (value, g_dbus_proxy_get_interface_info (proxy));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_dbus_proxy_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GDBusProxy *proxy = G_DBUS_PROXY (object);
switch (prop_id)
{
case PROP_G_CONNECTION:
proxy->priv->connection = g_value_dup_object (value);
break;
case PROP_G_FLAGS:
proxy->priv->flags = g_value_get_flags (value);
break;
case PROP_G_NAME:
proxy->priv->name = g_value_dup_string (value);
break;
case PROP_G_OBJECT_PATH:
proxy->priv->object_path = g_value_dup_string (value);
break;
case PROP_G_INTERFACE_NAME:
proxy->priv->interface_name = g_value_dup_string (value);
break;
case PROP_G_DEFAULT_TIMEOUT:
g_dbus_proxy_set_default_timeout (proxy, g_value_get_int (value));
break;
case PROP_G_INTERFACE_INFO:
g_dbus_proxy_set_interface_info (proxy, g_value_get_boxed (value));
break;
case PROP_G_BUS_TYPE:
proxy->priv->bus_type = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_dbus_proxy_class_init (GDBusProxyClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_dbus_proxy_finalize;
gobject_class->set_property = g_dbus_proxy_set_property;
gobject_class->get_property = g_dbus_proxy_get_property;
/* Note that all property names are prefixed to avoid collisions with D-Bus property names
* in derived classes */
/**
* GDBusProxy:g-interface-info:
*
* Ensure that interactions with this proxy conform to the given
* interface. This is mainly to ensure that malformed data received
* from the other peer is ignored. The given #GDBusInterfaceInfo is
* said to be the "expected interface".
*
* The checks performed are:
* - When completing a method call, if the type signature of
* the reply message isn't what's expected, the reply is
* discarded and the #GError is set to %G_IO_ERROR_INVALID_ARGUMENT.
*
* - Received signals that have a type signature mismatch are dropped and
* a warning is logged via g_warning().
*
* - Properties received via the initial `GetAll()` call or via the
* `::PropertiesChanged` signal (on the
* [org.freedesktop.DBus.Properties](http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties)
* interface) or set using g_dbus_proxy_set_cached_property()
* with a type signature mismatch are ignored and a warning is
* logged via g_warning().
*
* Note that these checks are never done on methods, signals and
* properties that are not referenced in the given
* #GDBusInterfaceInfo, since extending a D-Bus interface on the
* service-side is not considered an ABI break.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_INTERFACE_INFO,
g_param_spec_boxed ("g-interface-info", NULL, NULL,
G_TYPE_DBUS_INTERFACE_INFO,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy:g-connection:
*
* The #GDBusConnection the proxy is for.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_CONNECTION,
g_param_spec_object ("g-connection", NULL, NULL,
G_TYPE_DBUS_CONNECTION,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy:g-bus-type:
*
* If this property is not %G_BUS_TYPE_NONE, then
* #GDBusProxy:g-connection must be %NULL and will be set to the
* #GDBusConnection obtained by calling g_bus_get() with the value
* of this property.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_BUS_TYPE,
g_param_spec_enum ("g-bus-type", NULL, NULL,
G_TYPE_BUS_TYPE,
G_BUS_TYPE_NONE,
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy:g-flags:
*
* Flags from the #GDBusProxyFlags enumeration.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_FLAGS,
g_param_spec_flags ("g-flags", NULL, NULL,
G_TYPE_DBUS_PROXY_FLAGS,
G_DBUS_PROXY_FLAGS_NONE,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy:g-name:
*
* The well-known or unique name that the proxy is for.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_NAME,
g_param_spec_string ("g-name", NULL, NULL,
NULL,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy:g-name-owner:
*
* The unique name that owns #GDBusProxy:g-name or %NULL if no-one
* currently owns that name. You may connect to #GObject::notify signal to
* track changes to this property.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_NAME_OWNER,
g_param_spec_string ("g-name-owner", NULL, NULL,
NULL,
G_PARAM_READABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy:g-object-path:
*
* The object path the proxy is for.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_OBJECT_PATH,
g_param_spec_string ("g-object-path", NULL, NULL,
NULL,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy:g-interface-name:
*
* The D-Bus interface name the proxy is for.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_INTERFACE_NAME,
g_param_spec_string ("g-interface-name", NULL, NULL,
NULL,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy:g-default-timeout:
*
* The timeout to use if -1 (specifying default timeout) is passed
* as @timeout_msec in the g_dbus_proxy_call() and
* g_dbus_proxy_call_sync() functions.
*
* This allows applications to set a proxy-wide timeout for all
* remote method invocations on the proxy. If this property is -1,
* the default timeout (typically 25 seconds) is used. If set to
* %G_MAXINT, then no timeout is used.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_G_DEFAULT_TIMEOUT,
g_param_spec_int ("g-default-timeout", NULL, NULL,
-1,
G_MAXINT,
-1,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusProxy::g-properties-changed:
* @proxy: The #GDBusProxy emitting the signal.
* @changed_properties: A #GVariant containing the properties that changed (type: `a{sv}`)
* @invalidated_properties: A %NULL terminated array of properties that was invalidated
*
* Emitted when one or more D-Bus properties on @proxy changes. The
* local cache has already been updated when this signal fires. Note
* that both @changed_properties and @invalidated_properties are
* guaranteed to never be %NULL (either may be empty though).
*
* If the proxy has the flag
* %G_DBUS_PROXY_FLAGS_GET_INVALIDATED_PROPERTIES set, then
* @invalidated_properties will always be empty.
*
* This signal corresponds to the
* `PropertiesChanged` D-Bus signal on the
* `org.freedesktop.DBus.Properties` interface.
*
* Since: 2.26
*/
signals[PROPERTIES_CHANGED_SIGNAL] = g_signal_new (I_("g-properties-changed"),
G_TYPE_DBUS_PROXY,
G_SIGNAL_RUN_LAST | G_SIGNAL_MUST_COLLECT,
G_STRUCT_OFFSET (GDBusProxyClass, g_properties_changed),
NULL,
NULL,
_g_cclosure_marshal_VOID__VARIANT_BOXED,
G_TYPE_NONE,
2,
G_TYPE_VARIANT,
G_TYPE_STRV | G_SIGNAL_TYPE_STATIC_SCOPE);
g_signal_set_va_marshaller (signals[PROPERTIES_CHANGED_SIGNAL],
G_TYPE_FROM_CLASS (klass),
_g_cclosure_marshal_VOID__VARIANT_BOXEDv);
/**
* GDBusProxy::g-signal:
* @proxy: The #GDBusProxy emitting the signal.
* @sender_name: (nullable): The sender of the signal or %NULL if the connection is not a bus connection.
* @signal_name: The name of the signal.
* @parameters: A #GVariant tuple with parameters for the signal.
*
* Emitted when a signal from the remote object and interface that @proxy is for, has been received.
*
* Since 2.72 this signal supports detailed connections. You can connect to
* the detailed signal `g-signal::x` in order to receive callbacks only when
* signal `x` is received from the remote object.
*
* Since: 2.26
*/
signals[SIGNAL_SIGNAL] = g_signal_new (I_("g-signal"),
G_TYPE_DBUS_PROXY,
G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED | G_SIGNAL_MUST_COLLECT,
G_STRUCT_OFFSET (GDBusProxyClass, g_signal),
NULL,
NULL,
_g_cclosure_marshal_VOID__STRING_STRING_VARIANT,
G_TYPE_NONE,
3,
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_VARIANT);
g_signal_set_va_marshaller (signals[SIGNAL_SIGNAL],
G_TYPE_FROM_CLASS (klass),
_g_cclosure_marshal_VOID__STRING_STRING_VARIANTv);
}
static void
g_dbus_proxy_init (GDBusProxy *proxy)
{
proxy->priv = g_dbus_proxy_get_instance_private (proxy);
proxy->priv->properties = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
(GDestroyNotify) g_variant_unref);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_proxy_get_cached_property_names:
* @proxy: A #GDBusProxy.
*
* Gets the names of all cached properties on @proxy.
*
* Returns: (transfer full) (nullable) (array zero-terminated=1): A
* %NULL-terminated array of strings or %NULL if
* @proxy has no cached properties. Free the returned array with
* g_strfreev().
*
* Since: 2.26
*/
gchar **
g_dbus_proxy_get_cached_property_names (GDBusProxy *proxy)
{
gchar **names;
GPtrArray *p;
GHashTableIter iter;
const gchar *key;
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
G_LOCK (properties_lock);
names = NULL;
if (g_hash_table_size (proxy->priv->properties) == 0)
goto out;
p = g_ptr_array_new ();
g_hash_table_iter_init (&iter, proxy->priv->properties);
while (g_hash_table_iter_next (&iter, (gpointer) &key, NULL))
g_ptr_array_add (p, g_strdup (key));
g_ptr_array_sort_values (p, (GCompareFunc) g_strcmp0);
g_ptr_array_add (p, NULL);
names = (gchar **) g_ptr_array_free (p, FALSE);
out:
G_UNLOCK (properties_lock);
return names;
}
/* properties_lock must be held for as long as you will keep the
* returned value
*/
static const GDBusPropertyInfo *
lookup_property_info (GDBusProxy *proxy,
const gchar *property_name)
{
const GDBusPropertyInfo *info = NULL;
if (proxy->priv->expected_interface == NULL)
goto out;
info = g_dbus_interface_info_lookup_property (proxy->priv->expected_interface, property_name);
out:
return info;
}
/**
* g_dbus_proxy_get_cached_property:
* @proxy: A #GDBusProxy.
* @property_name: Property name.
*
* Looks up the value for a property from the cache. This call does no
* blocking IO.
*
* If @proxy has an expected interface (see
* #GDBusProxy:g-interface-info) and @property_name is referenced by
* it, then @value is checked against the type of the property.
*
* Returns: (transfer full) (nullable): A reference to the #GVariant instance
* that holds the value for @property_name or %NULL if the value is not in
* the cache. The returned reference must be freed with g_variant_unref().
*
* Since: 2.26
*/
GVariant *
g_dbus_proxy_get_cached_property (GDBusProxy *proxy,
const gchar *property_name)
{
const GDBusPropertyInfo *info;
GVariant *value;
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
g_return_val_if_fail (property_name != NULL, NULL);
G_LOCK (properties_lock);
value = g_hash_table_lookup (proxy->priv->properties, property_name);
if (value == NULL)
goto out;
info = lookup_property_info (proxy, property_name);
if (info != NULL)
{
const gchar *type_string = g_variant_get_type_string (value);
if (g_strcmp0 (type_string, info->signature) != 0)
{
g_warning ("Trying to get property %s with type %s but according to the expected "
"interface the type is %s",
property_name,
type_string,
info->signature);
value = NULL;
goto out;
}
}
g_variant_ref (value);
out:
G_UNLOCK (properties_lock);
return value;
}
/**
* g_dbus_proxy_set_cached_property:
* @proxy: A #GDBusProxy
* @property_name: Property name.
* @value: (nullable): Value for the property or %NULL to remove it from the cache.
*
* If @value is not %NULL, sets the cached value for the property with
* name @property_name to the value in @value.
*
* If @value is %NULL, then the cached value is removed from the
* property cache.
*
* If @proxy has an expected interface (see
* #GDBusProxy:g-interface-info) and @property_name is referenced by
* it, then @value is checked against the type of the property.
*
* If the @value #GVariant is floating, it is consumed. This allows
* convenient 'inline' use of g_variant_new(), e.g.
* |[<!-- language="C" -->
* g_dbus_proxy_set_cached_property (proxy,
* "SomeProperty",
* g_variant_new ("(si)",
* "A String",
* 42));
* ]|
*
* Normally you will not need to use this method since @proxy
* is tracking changes using the
* `org.freedesktop.DBus.Properties.PropertiesChanged`
* D-Bus signal. However, for performance reasons an object may
* decide to not use this signal for some properties and instead
* use a proprietary out-of-band mechanism to transmit changes.
*
* As a concrete example, consider an object with a property
* `ChatroomParticipants` which is an array of strings. Instead of
* transmitting the same (long) array every time the property changes,
* it is more efficient to only transmit the delta using e.g. signals
* `ChatroomParticipantJoined(String name)` and
* `ChatroomParticipantParted(String name)`.
*
* Since: 2.26
*/
void
g_dbus_proxy_set_cached_property (GDBusProxy *proxy,
const gchar *property_name,
GVariant *value)
{
const GDBusPropertyInfo *info;
g_return_if_fail (G_IS_DBUS_PROXY (proxy));
g_return_if_fail (property_name != NULL);
G_LOCK (properties_lock);
if (value != NULL)
{
info = lookup_property_info (proxy, property_name);
if (info != NULL)
{
if (g_strcmp0 (info->signature, g_variant_get_type_string (value)) != 0)
{
g_warning ("Trying to set property %s of type %s but according to the expected "
"interface the type is %s",
property_name,
g_variant_get_type_string (value),
info->signature);
goto out;
}
}
g_hash_table_insert (proxy->priv->properties,
g_strdup (property_name),
g_variant_ref_sink (value));
}
else
{
g_hash_table_remove (proxy->priv->properties, property_name);
}
out:
G_UNLOCK (properties_lock);
}
/* ---------------------------------------------------------------------------------------------------- */
static void
on_signal_received (GDBusConnection *connection,
const gchar *sender_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *signal_name,
GVariant *parameters,
gpointer user_data)
{
GWeakRef *proxy_weak = user_data;
GDBusProxy *proxy;
proxy = G_DBUS_PROXY (g_weak_ref_get (proxy_weak));
if (proxy == NULL)
return;
if (!proxy->priv->initialized)
goto out;
G_LOCK (properties_lock);
if (proxy->priv->name_owner != NULL && g_strcmp0 (sender_name, proxy->priv->name_owner) != 0)
{
G_UNLOCK (properties_lock);
goto out;
}
if (proxy->priv->expected_interface != NULL)
{
const GDBusSignalInfo *info;
info = g_dbus_interface_info_lookup_signal (proxy->priv->expected_interface, signal_name);
if (info != NULL)
{
GVariantType *expected_type;
expected_type = _g_dbus_compute_complete_signature (info->args);
if (!g_variant_type_equal (expected_type, g_variant_get_type (parameters)))
{
gchar *expected_type_string = g_variant_type_dup_string (expected_type);
g_warning ("Dropping signal %s of type %s since the type from the expected interface is %s",
info->name,
g_variant_get_type_string (parameters),
expected_type_string);
g_free (expected_type_string);
g_variant_type_free (expected_type);
G_UNLOCK (properties_lock);
goto out;
}
g_variant_type_free (expected_type);
}
}
G_UNLOCK (properties_lock);
g_signal_emit (proxy,
signals[SIGNAL_SIGNAL],
g_quark_try_string (signal_name),
sender_name,
signal_name,
parameters);
out:
g_clear_object (&proxy);
}
/* ---------------------------------------------------------------------------------------------------- */
/* must hold properties_lock */
static void
insert_property_checked (GDBusProxy *proxy,
gchar *property_name,
GVariant *value)
{
if (proxy->priv->expected_interface != NULL)
{
const GDBusPropertyInfo *info;
info = g_dbus_interface_info_lookup_property (proxy->priv->expected_interface, property_name);
/* Only check known properties */
if (info != NULL)
{
/* Warn about properties with the wrong type */
if (g_strcmp0 (info->signature, g_variant_get_type_string (value)) != 0)
{
g_warning ("Received property %s with type %s does not match expected type "
"%s in the expected interface",
property_name,
g_variant_get_type_string (value),
info->signature);
goto invalid;
}
}
}
g_hash_table_insert (proxy->priv->properties,
property_name, /* adopts string */
value); /* adopts value */
return;
invalid:
g_variant_unref (value);
g_free (property_name);
}
typedef struct
{
GDBusProxy *proxy;
gchar *prop_name;
} InvalidatedPropGetData;
static void
invalidated_property_get_cb (GDBusConnection *connection,
GAsyncResult *res,
gpointer user_data)
{
InvalidatedPropGetData *data = user_data;
const gchar *invalidated_properties[] = {NULL};
GVariantBuilder builder;
GVariant *value = NULL;
GVariant *unpacked_value = NULL;
/* errors are fine, the other end could have disconnected */
value = g_dbus_connection_call_finish (connection, res, NULL);
if (value == NULL)
{
goto out;
}
if (!g_variant_is_of_type (value, G_VARIANT_TYPE ("(v)")))
{
g_warning ("Expected type '(v)' for Get() reply, got '%s'", g_variant_get_type_string (value));
goto out;
}
g_variant_get (value, "(v)", &unpacked_value);
/* synthesize the a{sv} in the PropertiesChanged signal */
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sv}"));
g_variant_builder_add (&builder, "{sv}", data->prop_name, unpacked_value);
G_LOCK (properties_lock);
insert_property_checked (data->proxy,
data->prop_name, /* adopts string */
unpacked_value); /* adopts value */
data->prop_name = NULL;
G_UNLOCK (properties_lock);
g_signal_emit (data->proxy,
signals[PROPERTIES_CHANGED_SIGNAL], 0,
g_variant_builder_end (&builder), /* consumed */
invalidated_properties);
out:
if (value != NULL)
g_variant_unref (value);
g_object_unref (data->proxy);
g_free (data->prop_name);
g_slice_free (InvalidatedPropGetData, data);
}
static void
on_properties_changed (GDBusConnection *connection,
const gchar *sender_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *signal_name,
GVariant *parameters,
gpointer user_data)
{
GWeakRef *proxy_weak = user_data;
gboolean emit_g_signal = FALSE;
GDBusProxy *proxy;
const gchar *interface_name_for_signal;
GVariant *changed_properties;
gchar **invalidated_properties;
GVariantIter iter;
gchar *key;
GVariant *value;
guint n;
changed_properties = NULL;
invalidated_properties = NULL;
proxy = G_DBUS_PROXY (g_weak_ref_get (proxy_weak));
if (proxy == NULL)
return;
if (!proxy->priv->initialized)
goto out;
G_LOCK (properties_lock);
if (proxy->priv->name_owner != NULL && g_strcmp0 (sender_name, proxy->priv->name_owner) != 0)
{
G_UNLOCK (properties_lock);
goto out;
}
if (!g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(sa{sv}as)")))
{
g_warning ("Value for PropertiesChanged signal with type '%s' does not match '(sa{sv}as)'",
g_variant_get_type_string (parameters));
G_UNLOCK (properties_lock);
goto out;
}
g_variant_get (parameters,
"(&s@a{sv}^a&s)",
&interface_name_for_signal,
&changed_properties,
&invalidated_properties);
if (g_strcmp0 (interface_name_for_signal, proxy->priv->interface_name) != 0)
{
G_UNLOCK (properties_lock);
goto out;
}
g_variant_iter_init (&iter, changed_properties);
while (g_variant_iter_next (&iter, "{sv}", &key, &value))
{
insert_property_checked (proxy,
key, /* adopts string */
value); /* adopts value */
emit_g_signal = TRUE;
}
if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_GET_INVALIDATED_PROPERTIES)
{
if (proxy->priv->name_owner != NULL)
{
for (n = 0; invalidated_properties[n] != NULL; n++)
{
InvalidatedPropGetData *data;
data = g_slice_new0 (InvalidatedPropGetData);
data->proxy = g_object_ref (proxy);
data->prop_name = g_strdup (invalidated_properties[n]);
g_dbus_connection_call (proxy->priv->connection,
proxy->priv->name_owner,
proxy->priv->object_path,
DBUS_INTERFACE_PROPERTIES,
"Get",
g_variant_new ("(ss)", proxy->priv->interface_name, data->prop_name),
G_VARIANT_TYPE ("(v)"),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
NULL, /* GCancellable */
(GAsyncReadyCallback) invalidated_property_get_cb,
data);
}
}
}
else
{
emit_g_signal = TRUE;
for (n = 0; invalidated_properties[n] != NULL; n++)
{
g_hash_table_remove (proxy->priv->properties, invalidated_properties[n]);
}
}
G_UNLOCK (properties_lock);
if (emit_g_signal)
{
g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL],
0,
changed_properties,
invalidated_properties);
}
out:
g_clear_pointer (&changed_properties, g_variant_unref);
g_free (invalidated_properties);
g_clear_object (&proxy);
}
/* ---------------------------------------------------------------------------------------------------- */
static void
process_get_all_reply (GDBusProxy *proxy,
GVariant *result)
{
GVariantIter *iter;
gchar *key;
GVariant *value;
guint num_properties;
if (!g_variant_is_of_type (result, G_VARIANT_TYPE ("(a{sv})")))
{
g_warning ("Value for GetAll reply with type '%s' does not match '(a{sv})'",
g_variant_get_type_string (result));
goto out;
}
G_LOCK (properties_lock);
g_variant_get (result, "(a{sv})", &iter);
while (g_variant_iter_next (iter, "{sv}", &key, &value))
{
insert_property_checked (proxy,
key, /* adopts string */
value); /* adopts value */
}
g_variant_iter_free (iter);
num_properties = g_hash_table_size (proxy->priv->properties);
G_UNLOCK (properties_lock);
/* Synthesize ::g-properties-changed changed */
if (num_properties > 0)
{
GVariant *changed_properties;
const gchar *invalidated_properties[1] = {NULL};
g_variant_get (result,
"(@a{sv})",
&changed_properties);
g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL],
0,
changed_properties,
invalidated_properties);
g_variant_unref (changed_properties);
}
out:
;
}
typedef struct
{
GDBusProxy *proxy;
GCancellable *cancellable;
gchar *name_owner;
} LoadPropertiesOnNameOwnerChangedData;
static void
on_name_owner_changed_get_all_cb (GDBusConnection *connection,
GAsyncResult *res,
gpointer user_data)
{
LoadPropertiesOnNameOwnerChangedData *data = user_data;
GVariant *result;
GError *error;
gboolean cancelled;
cancelled = FALSE;
error = NULL;
result = g_dbus_connection_call_finish (connection,
res,
&error);
if (result == NULL)
{
if (error->domain == G_IO_ERROR && error->code == G_IO_ERROR_CANCELLED)
cancelled = TRUE;
/* We just ignore if GetAll() is failing. Because this might happen
* if the object has no properties at all. Or if the caller is
* not authorized to see the properties.
*
* Either way, apps can know about this by using
* get_cached_property_names() or get_cached_property().
*/
if (G_UNLIKELY (_g_dbus_debug_proxy ()))
{
g_debug ("error: %d %d %s",
error->domain,
error->code,
error->message);
}
g_error_free (error);
}
/* and finally we can notify */
if (!cancelled)
{
G_LOCK (properties_lock);
g_free (data->proxy->priv->name_owner);
data->proxy->priv->name_owner = g_steal_pointer (&data->name_owner);
g_hash_table_remove_all (data->proxy->priv->properties);
G_UNLOCK (properties_lock);
if (result != NULL)
{
process_get_all_reply (data->proxy, result);
g_variant_unref (result);
}
g_object_notify (G_OBJECT (data->proxy), "g-name-owner");
}
if (data->cancellable == data->proxy->priv->get_all_cancellable)
data->proxy->priv->get_all_cancellable = NULL;
g_object_unref (data->proxy);
g_object_unref (data->cancellable);
g_free (data->name_owner);
g_free (data);
}
static void
on_name_owner_changed (GDBusConnection *connection,
const gchar *sender_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *signal_name,
GVariant *parameters,
gpointer user_data)
{
GWeakRef *proxy_weak = user_data;
GDBusProxy *proxy;
const gchar *old_owner;
const gchar *new_owner;
proxy = G_DBUS_PROXY (g_weak_ref_get (proxy_weak));
if (proxy == NULL)
return;
/* if we are already trying to load properties, cancel that */
if (proxy->priv->get_all_cancellable != NULL)
{
g_cancellable_cancel (proxy->priv->get_all_cancellable);
proxy->priv->get_all_cancellable = NULL;
}
g_variant_get (parameters,
"(&s&s&s)",
NULL,
&old_owner,
&new_owner);
if (strlen (new_owner) == 0)
{
G_LOCK (properties_lock);
g_free (proxy->priv->name_owner);
proxy->priv->name_owner = NULL;
/* Synthesize ::g-properties-changed changed */
if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES) &&
g_hash_table_size (proxy->priv->properties) > 0)
{
GVariantBuilder builder;
GPtrArray *invalidated_properties;
GHashTableIter iter;
const gchar *key;
/* Build changed_properties (always empty) and invalidated_properties ... */
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sv}"));
invalidated_properties = g_ptr_array_new_with_free_func (g_free);
g_hash_table_iter_init (&iter, proxy->priv->properties);
while (g_hash_table_iter_next (&iter, (gpointer) &key, NULL))
g_ptr_array_add (invalidated_properties, g_strdup (key));
g_ptr_array_add (invalidated_properties, NULL);
/* ... throw out the properties ... */
g_hash_table_remove_all (proxy->priv->properties);
G_UNLOCK (properties_lock);
/* ... and finally emit the ::g-properties-changed signal */
g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL],
0,
g_variant_builder_end (&builder) /* consumed */,
(const gchar* const *) invalidated_properties->pdata);
g_ptr_array_unref (invalidated_properties);
}
else
{
G_UNLOCK (properties_lock);
}
g_object_notify (G_OBJECT (proxy), "g-name-owner");
}
else
{
G_LOCK (properties_lock);
/* ignore duplicates - this can happen when activating the service */
if (g_strcmp0 (new_owner, proxy->priv->name_owner) == 0)
{
G_UNLOCK (properties_lock);
goto out;
}
if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES)
{
g_free (proxy->priv->name_owner);
proxy->priv->name_owner = g_strdup (new_owner);
g_hash_table_remove_all (proxy->priv->properties);
G_UNLOCK (properties_lock);
g_object_notify (G_OBJECT (proxy), "g-name-owner");
}
else
{
LoadPropertiesOnNameOwnerChangedData *data;
G_UNLOCK (properties_lock);
/* start loading properties.. only then emit notify::g-name-owner .. we
* need to be able to cancel this in the event another NameOwnerChanged
* signal suddenly happens
*/
g_assert (proxy->priv->get_all_cancellable == NULL);
proxy->priv->get_all_cancellable = g_cancellable_new ();
data = g_new0 (LoadPropertiesOnNameOwnerChangedData, 1);
data->proxy = g_object_ref (proxy);
data->cancellable = proxy->priv->get_all_cancellable;
data->name_owner = g_strdup (new_owner);
g_dbus_connection_call (proxy->priv->connection,
data->name_owner,
proxy->priv->object_path,
DBUS_INTERFACE_PROPERTIES,
"GetAll",
g_variant_new ("(s)", proxy->priv->interface_name),
G_VARIANT_TYPE ("(a{sv})"),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
proxy->priv->get_all_cancellable,
(GAsyncReadyCallback) on_name_owner_changed_get_all_cb,
data);
}
}
out:
g_clear_object (&proxy);
}
/* ---------------------------------------------------------------------------------------------------- */
static void
async_init_get_all_cb (GDBusConnection *connection,
GAsyncResult *res,
gpointer user_data)
{
GTask *task = user_data;
GVariant *result;
GError *error;
error = NULL;
result = g_dbus_connection_call_finish (connection,
res,
&error);
if (result == NULL)
{
/* We just ignore if GetAll() is failing. Because this might happen
* if the object has no properties at all. Or if the caller is
* not authorized to see the properties.
*
* Either way, apps can know about this by using
* get_cached_property_names() or get_cached_property().
*/
if (G_UNLIKELY (_g_dbus_debug_proxy ()))
{
g_debug ("error: %d %d %s",
error->domain,
error->code,
error->message);
}
g_error_free (error);
}
g_task_return_pointer (task, result,
(GDestroyNotify) g_variant_unref);
g_object_unref (task);
}
static void
async_init_data_set_name_owner (GTask *task,
const gchar *name_owner)
{
GDBusProxy *proxy = g_task_get_source_object (task);
gboolean get_all;
if (name_owner != NULL)
{
G_LOCK (properties_lock);
/* Must free first, since on_name_owner_changed() could run before us */
g_free (proxy->priv->name_owner);
proxy->priv->name_owner = g_strdup (name_owner);
G_UNLOCK (properties_lock);
}
get_all = TRUE;
if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES)
{
/* Don't load properties if the API user doesn't want them */
get_all = FALSE;
}
else if (name_owner == NULL && proxy->priv->name != NULL)
{
/* Don't attempt to load properties if the name_owner is NULL (which
* usually means the name isn't owned), unless name is also NULL (which
* means we actually wanted to talk to the directly-connected process -
* either dbus-daemon or a peer - instead of going via dbus-daemon)
*/
get_all = FALSE;
}
if (get_all)
{
/* load all properties asynchronously */
g_dbus_connection_call (proxy->priv->connection,
name_owner,
proxy->priv->object_path,
DBUS_INTERFACE_PROPERTIES,
"GetAll",
g_variant_new ("(s)", proxy->priv->interface_name),
G_VARIANT_TYPE ("(a{sv})"),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
g_task_get_cancellable (task),
(GAsyncReadyCallback) async_init_get_all_cb,
task);
}
else
{
g_task_return_pointer (task, NULL, NULL);
g_object_unref (task);
}
}
static void
async_init_get_name_owner_cb (GDBusConnection *connection,
GAsyncResult *res,
gpointer user_data)
{
GTask *task = user_data;
GError *error;
GVariant *result;
error = NULL;
result = g_dbus_connection_call_finish (connection,
res,
&error);
if (result == NULL)
{
if (error->domain == G_DBUS_ERROR &&
error->code == G_DBUS_ERROR_NAME_HAS_NO_OWNER)
{
g_error_free (error);
async_init_data_set_name_owner (task, NULL);
}
else
{
g_task_return_error (task, error);
g_object_unref (task);
}
}
else
{
/* borrowed from result to avoid an extra copy */
const gchar *name_owner;
g_variant_get (result, "(&s)", &name_owner);
async_init_data_set_name_owner (task, name_owner);
g_variant_unref (result);
}
}
static void
async_init_call_get_name_owner (GTask *task)
{
GDBusProxy *proxy = g_task_get_source_object (task);
g_dbus_connection_call (proxy->priv->connection,
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"GetNameOwner",
g_variant_new ("(s)",
proxy->priv->name),
G_VARIANT_TYPE ("(s)"),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
g_task_get_cancellable (task),
(GAsyncReadyCallback) async_init_get_name_owner_cb,
task);
}
static void
async_init_start_service_by_name_cb (GDBusConnection *connection,
GAsyncResult *res,
gpointer user_data)
{
GTask *task = user_data;
GDBusProxy *proxy = g_task_get_source_object (task);
GError *error;
GVariant *result;
error = NULL;
result = g_dbus_connection_call_finish (connection,
res,
&error);
if (result == NULL)
{
/* Errors are not unexpected; the bus will reply e.g.
*
* org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Epiphany2
* was not provided by any .service files
*
* or (see #677718)
*
* org.freedesktop.systemd1.Masked: Unit polkit.service is masked.
*
* This doesn't mean that the name doesn't have an owner, just
* that it's not provided by a .service file or can't currently
* be started.
*
* In particular, in both cases, it could be that a service
* owner will actually appear later. So instead of erroring out,
* we just proceed to invoke GetNameOwner() if dealing with the
* kind of errors above.
*/
if (error->domain == G_DBUS_ERROR && error->code == G_DBUS_ERROR_SERVICE_UNKNOWN)
{
g_error_free (error);
}
else
{
gchar *remote_error = g_dbus_error_get_remote_error (error);
if (g_strcmp0 (remote_error, "org.freedesktop.systemd1.Masked") == 0)
{
g_error_free (error);
g_free (remote_error);
}
else
{
g_dbus_error_strip_remote_error (error);
g_prefix_error (&error,
_("Error calling StartServiceByName for %s: "),
proxy->priv->name);
g_free (remote_error);
goto failed;
}
}
}
else
{
guint32 start_service_result;
g_variant_get (result,
"(u)",
&start_service_result);
g_variant_unref (result);
if (start_service_result == DBUS_START_REPLY_SUCCESS ||
start_service_result == DBUS_START_REPLY_ALREADY_RUNNING)
{
/* continue to invoke GetNameOwner() */
}
else
{
error = g_error_new (G_IO_ERROR,
G_IO_ERROR_FAILED,
_("Unexpected reply %d from StartServiceByName(\"%s\") method"),
start_service_result,
proxy->priv->name);
goto failed;
}
}
async_init_call_get_name_owner (task);
return;
failed:
g_warn_if_fail (error != NULL);
g_task_return_error (task, error);
g_object_unref (task);
}
static void
async_init_call_start_service_by_name (GTask *task)
{
GDBusProxy *proxy = g_task_get_source_object (task);
g_dbus_connection_call (proxy->priv->connection,
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"StartServiceByName",
g_variant_new ("(su)",
proxy->priv->name,
0),
G_VARIANT_TYPE ("(u)"),
G_DBUS_CALL_FLAGS_NONE,
-1, /* timeout */
g_task_get_cancellable (task),
(GAsyncReadyCallback) async_init_start_service_by_name_cb,
task);
}
static void
async_initable_init_second_async (GAsyncInitable *initable,
gint io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDBusProxy *proxy = G_DBUS_PROXY (initable);
GTask *task;
task = g_task_new (proxy, cancellable, callback, user_data);
g_task_set_source_tag (task, async_initable_init_second_async);
g_task_set_name (task, "[gio] D-Bus proxy init");
g_task_set_priority (task, io_priority);
/* Check name ownership asynchronously - possibly also start the service */
if (proxy->priv->name == NULL)
{
/* Do nothing */
async_init_data_set_name_owner (task, NULL);
}
else if (g_dbus_is_unique_name (proxy->priv->name))
{
async_init_data_set_name_owner (task, proxy->priv->name);
}
else
{
if ((proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START) ||
(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START_AT_CONSTRUCTION))
{
async_init_call_get_name_owner (task);
}
else
{
async_init_call_start_service_by_name (task);
}
}
}
static gboolean
async_initable_init_second_finish (GAsyncInitable *initable,
GAsyncResult *res,
GError **error)
{
GDBusProxy *proxy = G_DBUS_PROXY (initable);
GTask *task = G_TASK (res);
GVariant *result;
gboolean ret;
ret = !g_task_had_error (task);
result = g_task_propagate_pointer (task, error);
if (result != NULL)
{
process_get_all_reply (proxy, result);
g_variant_unref (result);
}
proxy->priv->initialized = TRUE;
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static void
async_initable_init_first (GAsyncInitable *initable)
{
GDBusProxy *proxy = G_DBUS_PROXY (initable);
GDBusSignalFlags signal_flags = G_DBUS_SIGNAL_FLAGS_NONE;
if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_NO_MATCH_RULE)
signal_flags |= G_DBUS_SIGNAL_FLAGS_NO_MATCH_RULE;
if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES))
{
/* subscribe to PropertiesChanged() */
proxy->priv->properties_changed_subscription_id =
g_dbus_connection_signal_subscribe (proxy->priv->connection,
proxy->priv->name,
DBUS_INTERFACE_PROPERTIES,
"PropertiesChanged",
proxy->priv->object_path,
proxy->priv->interface_name,
signal_flags,
on_properties_changed,
weak_ref_new (G_OBJECT (proxy)),
(GDestroyNotify) weak_ref_free);
}
if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS))
{
/* subscribe to all signals for the object */
proxy->priv->signals_subscription_id =
g_dbus_connection_signal_subscribe (proxy->priv->connection,
proxy->priv->name,
proxy->priv->interface_name,
NULL, /* member */
proxy->priv->object_path,
NULL, /* arg0 */
signal_flags,
on_signal_received,
weak_ref_new (G_OBJECT (proxy)),
(GDestroyNotify) weak_ref_free);
}
if (proxy->priv->name != NULL &&
(g_dbus_connection_get_flags (proxy->priv->connection) & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION))
{
proxy->priv->name_owner_changed_subscription_id =
g_dbus_connection_signal_subscribe (proxy->priv->connection,
DBUS_SERVICE_DBUS,
DBUS_INTERFACE_DBUS,
"NameOwnerChanged", /* signal name */
DBUS_PATH_DBUS,
proxy->priv->name, /* arg0 */
signal_flags,
on_name_owner_changed,
weak_ref_new (G_OBJECT (proxy)),
(GDestroyNotify) weak_ref_free);
}
}
/* ---------------------------------------------------------------------------------------------------- */
/* initialization is split into two parts - the first is the
* non-blocking part that requires the callers GMainContext - the
* second is a blocking part async part that doesn't require the
* callers GMainContext.. we do this split so the code can be reused
* in the GInitable implementation below.
*
* Note that obtaining a GDBusConnection is not shared between the two
* paths.
*/
static void
init_second_async_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GTask *task = user_data;
GError *error = NULL;
if (async_initable_init_second_finish (G_ASYNC_INITABLE (source_object), res, &error))
g_task_return_boolean (task, TRUE);
else
g_task_return_error (task, error);
g_object_unref (task);
}
static void
get_connection_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GTask *task = user_data;
GDBusProxy *proxy = g_task_get_source_object (task);
GError *error;
error = NULL;
proxy->priv->connection = g_bus_get_finish (res, &error);
if (proxy->priv->connection == NULL)
{
g_task_return_error (task, error);
g_object_unref (task);
}
else
{
async_initable_init_first (G_ASYNC_INITABLE (proxy));
async_initable_init_second_async (G_ASYNC_INITABLE (proxy),
g_task_get_priority (task),
g_task_get_cancellable (task),
init_second_async_cb,
task);
}
}
static void
async_initable_init_async (GAsyncInitable *initable,
gint io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDBusProxy *proxy = G_DBUS_PROXY (initable);
GTask *task;
task = g_task_new (proxy, cancellable, callback, user_data);
g_task_set_source_tag (task, async_initable_init_async);
g_task_set_name (task, "[gio] D-Bus proxy init");
g_task_set_priority (task, io_priority);
if (proxy->priv->bus_type != G_BUS_TYPE_NONE)
{
g_assert (proxy->priv->connection == NULL);
g_bus_get (proxy->priv->bus_type,
cancellable,
get_connection_cb,
task);
}
else
{
async_initable_init_first (initable);
async_initable_init_second_async (initable, io_priority, cancellable,
init_second_async_cb, task);
}
}
static gboolean
async_initable_init_finish (GAsyncInitable *initable,
GAsyncResult *res,
GError **error)
{
return g_task_propagate_boolean (G_TASK (res), error);
}
static void
async_initable_iface_init (GAsyncInitableIface *async_initable_iface)
{
async_initable_iface->init_async = async_initable_init_async;
async_initable_iface->init_finish = async_initable_init_finish;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GMainContext *context;
GMainLoop *loop;
GAsyncResult *res;
} InitableAsyncInitableData;
static void
async_initable_init_async_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
InitableAsyncInitableData *data = user_data;
data->res = g_object_ref (res);
g_main_loop_quit (data->loop);
}
/* Simply reuse the GAsyncInitable implementation but run the first
* part (that is non-blocking and requires the callers GMainContext)
* with the callers GMainContext.. and the second with a private
* GMainContext (bug 621310 is slightly related).
*
* Note that obtaining a GDBusConnection is not shared between the two
* paths.
*/
static gboolean
initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
GDBusProxy *proxy = G_DBUS_PROXY (initable);
InitableAsyncInitableData *data;
gboolean ret;
ret = FALSE;
if (proxy->priv->bus_type != G_BUS_TYPE_NONE)
{
g_assert (proxy->priv->connection == NULL);
proxy->priv->connection = g_bus_get_sync (proxy->priv->bus_type,
cancellable,
error);
if (proxy->priv->connection == NULL)
goto out;
}
async_initable_init_first (G_ASYNC_INITABLE (initable));
data = g_new0 (InitableAsyncInitableData, 1);
data->context = g_main_context_new ();
data->loop = g_main_loop_new (data->context, FALSE);
g_main_context_push_thread_default (data->context);
async_initable_init_second_async (G_ASYNC_INITABLE (initable),
G_PRIORITY_DEFAULT,
cancellable,
async_initable_init_async_cb,
data);
g_main_loop_run (data->loop);
ret = async_initable_init_second_finish (G_ASYNC_INITABLE (initable),
data->res,
error);
g_main_context_pop_thread_default (data->context);
g_main_context_unref (data->context);
g_main_loop_unref (data->loop);
g_object_unref (data->res);
g_free (data);
out:
return ret;
}
static void
initable_iface_init (GInitableIface *initable_iface)
{
initable_iface->init = initable_init;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_proxy_new:
* @connection: A #GDBusConnection.
* @flags: Flags used when constructing the proxy.
* @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
* @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
* @object_path: An object path.
* @interface_name: A D-Bus interface name.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @callback: Callback function to invoke when the proxy is ready.
* @user_data: User data to pass to @callback.
*
* Creates a proxy for accessing @interface_name on the remote object
* at @object_path owned by @name at @connection and asynchronously
* loads D-Bus properties unless the
* %G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES flag is used. Connect to
* the #GDBusProxy::g-properties-changed signal to get notified about
* property changes.
*
* If the %G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS flag is not set, also sets up
* match rules for signals. Connect to the #GDBusProxy::g-signal signal
* to handle signals from the remote object.
*
* If both %G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES and
* %G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS are set, this constructor is
* guaranteed to complete immediately without blocking.
*
* If @name is a well-known name and the
* %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START and %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START_AT_CONSTRUCTION
* flags aren't set and no name owner currently exists, the message bus
* will be requested to launch a name owner for the name.
*
* This is a failable asynchronous constructor - when the proxy is
* ready, @callback will be invoked and you can use
* g_dbus_proxy_new_finish() to get the result.
*
* See g_dbus_proxy_new_sync() and for a synchronous version of this constructor.
*
* #GDBusProxy is used in this [example][gdbus-wellknown-proxy].
*
* Since: 2.26
*/
void
g_dbus_proxy_new (GDBusConnection *connection,
GDBusProxyFlags flags,
GDBusInterfaceInfo *info,
const gchar *name,
const gchar *object_path,
const gchar *interface_name,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
_g_dbus_initialize ();
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
g_return_if_fail ((name == NULL && g_dbus_connection_get_unique_name (connection) == NULL) || g_dbus_is_name (name));
g_return_if_fail (g_variant_is_object_path (object_path));
g_return_if_fail (g_dbus_is_interface_name (interface_name));
g_async_initable_new_async (G_TYPE_DBUS_PROXY,
G_PRIORITY_DEFAULT,
cancellable,
callback,
user_data,
"g-flags", flags,
"g-interface-info", info,
"g-name", name,
"g-connection", connection,
"g-object-path", object_path,
"g-interface-name", interface_name,
NULL);
}
/**
* g_dbus_proxy_new_finish:
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback function passed to g_dbus_proxy_new().
* @error: Return location for error or %NULL.
*
* Finishes creating a #GDBusProxy.
*
* Returns: (transfer full): A #GDBusProxy or %NULL if @error is set.
* Free with g_object_unref().
*
* Since: 2.26
*/
GDBusProxy *
g_dbus_proxy_new_finish (GAsyncResult *res,
GError **error)
{
GObject *object;
GObject *source_object;
source_object = g_async_result_get_source_object (res);
g_assert (source_object != NULL);
object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
res,
error);
g_object_unref (source_object);
if (object != NULL)
return G_DBUS_PROXY (object);
else
return NULL;
}
/**
* g_dbus_proxy_new_sync:
* @connection: A #GDBusConnection.
* @flags: Flags used when constructing the proxy.
* @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
* @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
* @object_path: An object path.
* @interface_name: A D-Bus interface name.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @error: (nullable): Return location for error or %NULL.
*
* Creates a proxy for accessing @interface_name on the remote object
* at @object_path owned by @name at @connection and synchronously
* loads D-Bus properties unless the
* %G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES flag is used.
*
* If the %G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS flag is not set, also sets up
* match rules for signals. Connect to the #GDBusProxy::g-signal signal
* to handle signals from the remote object.
*
* If both %G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES and
* %G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS are set, this constructor is
* guaranteed to return immediately without blocking.
*
* If @name is a well-known name and the
* %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START and %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START_AT_CONSTRUCTION
* flags aren't set and no name owner currently exists, the message bus
* will be requested to launch a name owner for the name.
*
* This is a synchronous failable constructor. See g_dbus_proxy_new()
* and g_dbus_proxy_new_finish() for the asynchronous version.
*
* #GDBusProxy is used in this [example][gdbus-wellknown-proxy].
*
* Returns: (transfer full): A #GDBusProxy or %NULL if error is set.
* Free with g_object_unref().
*
* Since: 2.26
*/
GDBusProxy *
g_dbus_proxy_new_sync (GDBusConnection *connection,
GDBusProxyFlags flags,
GDBusInterfaceInfo *info,
const gchar *name,
const gchar *object_path,
const gchar *interface_name,
GCancellable *cancellable,
GError **error)
{
GInitable *initable;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail ((name == NULL && g_dbus_connection_get_unique_name (connection) == NULL) ||
g_dbus_is_name (name), NULL);
g_return_val_if_fail (g_variant_is_object_path (object_path), NULL);
g_return_val_if_fail (g_dbus_is_interface_name (interface_name), NULL);
initable = g_initable_new (G_TYPE_DBUS_PROXY,
cancellable,
error,
"g-flags", flags,
"g-interface-info", info,
"g-name", name,
"g-connection", connection,
"g-object-path", object_path,
"g-interface-name", interface_name,
NULL);
if (initable != NULL)
return G_DBUS_PROXY (initable);
else
return NULL;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_proxy_new_for_bus:
* @bus_type: A #GBusType.
* @flags: Flags used when constructing the proxy.
* @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
* @name: A bus name (well-known or unique).
* @object_path: An object path.
* @interface_name: A D-Bus interface name.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @callback: Callback function to invoke when the proxy is ready.
* @user_data: User data to pass to @callback.
*
* Like g_dbus_proxy_new() but takes a #GBusType instead of a #GDBusConnection.
*
* #GDBusProxy is used in this [example][gdbus-wellknown-proxy].
*
* Since: 2.26
*/
void
g_dbus_proxy_new_for_bus (GBusType bus_type,
GDBusProxyFlags flags,
GDBusInterfaceInfo *info,
const gchar *name,
const gchar *object_path,
const gchar *interface_name,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
_g_dbus_initialize ();
g_return_if_fail (g_dbus_is_name (name));
g_return_if_fail (g_variant_is_object_path (object_path));
g_return_if_fail (g_dbus_is_interface_name (interface_name));
g_async_initable_new_async (G_TYPE_DBUS_PROXY,
G_PRIORITY_DEFAULT,
cancellable,
callback,
user_data,
"g-flags", flags,
"g-interface-info", info,
"g-name", name,
"g-bus-type", bus_type,
"g-object-path", object_path,
"g-interface-name", interface_name,
NULL);
}
/**
* g_dbus_proxy_new_for_bus_finish:
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback function passed to g_dbus_proxy_new_for_bus().
* @error: Return location for error or %NULL.
*
* Finishes creating a #GDBusProxy.
*
* Returns: (transfer full): A #GDBusProxy or %NULL if @error is set.
* Free with g_object_unref().
*
* Since: 2.26
*/
GDBusProxy *
g_dbus_proxy_new_for_bus_finish (GAsyncResult *res,
GError **error)
{
return g_dbus_proxy_new_finish (res, error);
}
/**
* g_dbus_proxy_new_for_bus_sync:
* @bus_type: A #GBusType.
* @flags: Flags used when constructing the proxy.
* @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface
* that @proxy conforms to or %NULL.
* @name: A bus name (well-known or unique).
* @object_path: An object path.
* @interface_name: A D-Bus interface name.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Like g_dbus_proxy_new_sync() but takes a #GBusType instead of a #GDBusConnection.
*
* #GDBusProxy is used in this [example][gdbus-wellknown-proxy].
*
* Returns: (transfer full): A #GDBusProxy or %NULL if error is set.
* Free with g_object_unref().
*
* Since: 2.26
*/
GDBusProxy *
g_dbus_proxy_new_for_bus_sync (GBusType bus_type,
GDBusProxyFlags flags,
GDBusInterfaceInfo *info,
const gchar *name,
const gchar *object_path,
const gchar *interface_name,
GCancellable *cancellable,
GError **error)
{
GInitable *initable;
_g_dbus_initialize ();
g_return_val_if_fail (g_dbus_is_name (name), NULL);
g_return_val_if_fail (g_variant_is_object_path (object_path), NULL);
g_return_val_if_fail (g_dbus_is_interface_name (interface_name), NULL);
initable = g_initable_new (G_TYPE_DBUS_PROXY,
cancellable,
error,
"g-flags", flags,
"g-interface-info", info,
"g-name", name,
"g-bus-type", bus_type,
"g-object-path", object_path,
"g-interface-name", interface_name,
NULL);
if (initable != NULL)
return G_DBUS_PROXY (initable);
else
return NULL;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_proxy_get_connection:
* @proxy: A #GDBusProxy.
*
* Gets the connection @proxy is for.
*
* Returns: (transfer none) (not nullable): A #GDBusConnection owned by @proxy. Do not free.
*
* Since: 2.26
*/
GDBusConnection *
g_dbus_proxy_get_connection (GDBusProxy *proxy)
{
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
return proxy->priv->connection;
}
/**
* g_dbus_proxy_get_flags:
* @proxy: A #GDBusProxy.
*
* Gets the flags that @proxy was constructed with.
*
* Returns: Flags from the #GDBusProxyFlags enumeration.
*
* Since: 2.26
*/
GDBusProxyFlags
g_dbus_proxy_get_flags (GDBusProxy *proxy)
{
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), 0);
return proxy->priv->flags;
}
/**
* g_dbus_proxy_get_name:
* @proxy: A #GDBusProxy.
*
* Gets the name that @proxy was constructed for.
*
* When connected to a message bus, this will usually be non-%NULL.
* However, it may be %NULL for a proxy that communicates using a peer-to-peer
* pattern.
*
* Returns: (nullable): A string owned by @proxy. Do not free.
*
* Since: 2.26
*/
const gchar *
g_dbus_proxy_get_name (GDBusProxy *proxy)
{
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
return proxy->priv->name;
}
/**
* g_dbus_proxy_get_name_owner:
* @proxy: A #GDBusProxy.
*
* The unique name that owns the name that @proxy is for or %NULL if
* no-one currently owns that name. You may connect to the
* #GObject::notify signal to track changes to the
* #GDBusProxy:g-name-owner property.
*
* Returns: (transfer full) (nullable): The name owner or %NULL if no name
* owner exists. Free with g_free().
*
* Since: 2.26
*/
gchar *
g_dbus_proxy_get_name_owner (GDBusProxy *proxy)
{
gchar *ret;
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
G_LOCK (properties_lock);
ret = g_strdup (proxy->priv->name_owner);
G_UNLOCK (properties_lock);
return ret;
}
/**
* g_dbus_proxy_get_object_path:
* @proxy: A #GDBusProxy.
*
* Gets the object path @proxy is for.
*
* Returns: (not nullable): A string owned by @proxy. Do not free.
*
* Since: 2.26
*/
const gchar *
g_dbus_proxy_get_object_path (GDBusProxy *proxy)
{
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
return proxy->priv->object_path;
}
/**
* g_dbus_proxy_get_interface_name:
* @proxy: A #GDBusProxy.
*
* Gets the D-Bus interface name @proxy is for.
*
* Returns: (not nullable): A string owned by @proxy. Do not free.
*
* Since: 2.26
*/
const gchar *
g_dbus_proxy_get_interface_name (GDBusProxy *proxy)
{
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
return proxy->priv->interface_name;
}
/**
* g_dbus_proxy_get_default_timeout:
* @proxy: A #GDBusProxy.
*
* Gets the timeout to use if -1 (specifying default timeout) is
* passed as @timeout_msec in the g_dbus_proxy_call() and
* g_dbus_proxy_call_sync() functions.
*
* See the #GDBusProxy:g-default-timeout property for more details.
*
* Returns: Timeout to use for @proxy.
*
* Since: 2.26
*/
gint
g_dbus_proxy_get_default_timeout (GDBusProxy *proxy)
{
gint ret;
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), -1);
G_LOCK (properties_lock);
ret = proxy->priv->timeout_msec;
G_UNLOCK (properties_lock);
return ret;
}
/**
* g_dbus_proxy_set_default_timeout:
* @proxy: A #GDBusProxy.
* @timeout_msec: Timeout in milliseconds.
*
* Sets the timeout to use if -1 (specifying default timeout) is
* passed as @timeout_msec in the g_dbus_proxy_call() and
* g_dbus_proxy_call_sync() functions.
*
* See the #GDBusProxy:g-default-timeout property for more details.
*
* Since: 2.26
*/
void
g_dbus_proxy_set_default_timeout (GDBusProxy *proxy,
gint timeout_msec)
{
g_return_if_fail (G_IS_DBUS_PROXY (proxy));
g_return_if_fail (timeout_msec == -1 || timeout_msec >= 0);
G_LOCK (properties_lock);
if (proxy->priv->timeout_msec != timeout_msec)
{
proxy->priv->timeout_msec = timeout_msec;
G_UNLOCK (properties_lock);
g_object_notify (G_OBJECT (proxy), "g-default-timeout");
}
else
{
G_UNLOCK (properties_lock);
}
}
/**
* g_dbus_proxy_get_interface_info:
* @proxy: A #GDBusProxy
*
* Returns the #GDBusInterfaceInfo, if any, specifying the interface
* that @proxy conforms to. See the #GDBusProxy:g-interface-info
* property for more details.
*
* Returns: (transfer none) (nullable): A #GDBusInterfaceInfo or %NULL.
* Do not unref the returned object, it is owned by @proxy.
*
* Since: 2.26
*/
GDBusInterfaceInfo *
g_dbus_proxy_get_interface_info (GDBusProxy *proxy)
{
GDBusInterfaceInfo *ret;
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
G_LOCK (properties_lock);
ret = proxy->priv->expected_interface;
G_UNLOCK (properties_lock);
/* FIXME: returning a borrowed ref with no guarantee that nobody will
* call g_dbus_proxy_set_interface_info() and make it invalid...
*/
return ret;
}
/**
* g_dbus_proxy_set_interface_info:
* @proxy: A #GDBusProxy
* @info: (transfer none) (nullable): Minimum interface this proxy conforms to
* or %NULL to unset.
*
* Ensure that interactions with @proxy conform to the given
* interface. See the #GDBusProxy:g-interface-info property for more
* details.
*
* Since: 2.26
*/
void
g_dbus_proxy_set_interface_info (GDBusProxy *proxy,
GDBusInterfaceInfo *info)
{
g_return_if_fail (G_IS_DBUS_PROXY (proxy));
G_LOCK (properties_lock);
if (proxy->priv->expected_interface != NULL)
{
g_dbus_interface_info_cache_release (proxy->priv->expected_interface);
g_dbus_interface_info_unref (proxy->priv->expected_interface);
}
proxy->priv->expected_interface = info != NULL ? g_dbus_interface_info_ref (info) : NULL;
if (proxy->priv->expected_interface != NULL)
g_dbus_interface_info_cache_build (proxy->priv->expected_interface);
G_UNLOCK (properties_lock);
}
/* ---------------------------------------------------------------------------------------------------- */
static gboolean
maybe_split_method_name (const gchar *method_name,
gchar **out_interface_name,
const gchar **out_method_name)
{
gboolean was_split;
was_split = FALSE;
g_assert (out_interface_name != NULL);
g_assert (out_method_name != NULL);
*out_interface_name = NULL;
*out_method_name = NULL;
if (strchr (method_name, '.') != NULL)
{
gchar *p;
gchar *last_dot;
p = g_strdup (method_name);
last_dot = strrchr (p, '.');
*last_dot = '\0';
*out_interface_name = p;
*out_method_name = last_dot + 1;
was_split = TRUE;
}
return was_split;
}
typedef struct
{
GVariant *value;
#ifdef G_OS_UNIX
GUnixFDList *fd_list;
#endif
} ReplyData;
static void
reply_data_free (ReplyData *data)
{
g_variant_unref (data->value);
#ifdef G_OS_UNIX
if (data->fd_list != NULL)
g_object_unref (data->fd_list);
#endif
g_slice_free (ReplyData, data);
}
static void
reply_cb (GDBusConnection *connection,
GAsyncResult *res,
gpointer user_data)
{
GTask *task = user_data;
GVariant *value;
GError *error;
#ifdef G_OS_UNIX
GUnixFDList *fd_list;
#endif
error = NULL;
#ifdef G_OS_UNIX
value = g_dbus_connection_call_with_unix_fd_list_finish (connection,
&fd_list,
res,
&error);
#else
value = g_dbus_connection_call_finish (connection,
res,
&error);
#endif
if (error != NULL)
{
g_task_return_error (task, error);
}
else
{
ReplyData *data;
data = g_slice_new0 (ReplyData);
data->value = value;
#ifdef G_OS_UNIX
data->fd_list = fd_list;
#endif
g_task_return_pointer (task, data, (GDestroyNotify) reply_data_free);
}
g_object_unref (task);
}
/* properties_lock must be held for as long as you will keep the
* returned value
*/
static const GDBusMethodInfo *
lookup_method_info (GDBusProxy *proxy,
const gchar *method_name)
{
const GDBusMethodInfo *info = NULL;
if (proxy->priv->expected_interface == NULL)
goto out;
info = g_dbus_interface_info_lookup_method (proxy->priv->expected_interface, method_name);
out:
return info;
}
/* properties_lock must be held for as long as you will keep the
* returned value
*/
static const gchar *
get_destination_for_call (GDBusProxy *proxy)
{
const gchar *ret;
ret = NULL;
/* If proxy->priv->name is a unique name, then proxy->priv->name_owner
* is never NULL and always the same as proxy->priv->name. We use this
* knowledge to avoid checking if proxy->priv->name is a unique or
* well-known name.
*/
ret = proxy->priv->name_owner;
if (ret != NULL)
goto out;
if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START)
goto out;
ret = proxy->priv->name;
out:
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static void
g_dbus_proxy_call_internal (GDBusProxy *proxy,
const gchar *method_name,
GVariant *parameters,
GDBusCallFlags flags,
gint timeout_msec,
GUnixFDList *fd_list,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task;
gboolean was_split;
gchar *split_interface_name;
const gchar *split_method_name;
const gchar *target_method_name;
const gchar *target_interface_name;
gchar *destination;
GVariantType *reply_type;
GAsyncReadyCallback my_callback;
g_return_if_fail (G_IS_DBUS_PROXY (proxy));
g_return_if_fail (g_dbus_is_member_name (method_name) || g_dbus_is_interface_name (method_name));
g_return_if_fail (parameters == NULL || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE));
g_return_if_fail (timeout_msec == -1 || timeout_msec >= 0);
#ifdef G_OS_UNIX
g_return_if_fail (fd_list == NULL || G_IS_UNIX_FD_LIST (fd_list));
#else
g_return_if_fail (fd_list == NULL);
#endif
reply_type = NULL;
split_interface_name = NULL;
/* g_dbus_connection_call() is optimised for the case of a NULL
* callback. If we get a NULL callback from our user then make sure
* we pass along a NULL callback for ourselves as well.
*/
if (callback != NULL)
{
my_callback = (GAsyncReadyCallback) reply_cb;
task = g_task_new (proxy, cancellable, callback, user_data);
g_task_set_source_tag (task, g_dbus_proxy_call_internal);
g_task_set_name (task, "[gio] D-Bus proxy call");
}
else
{
my_callback = NULL;
task = NULL;
}
G_LOCK (properties_lock);
was_split = maybe_split_method_name (method_name, &split_interface_name, &split_method_name);
target_method_name = was_split ? split_method_name : method_name;
target_interface_name = was_split ? split_interface_name : proxy->priv->interface_name;
/* Warn if method is unexpected (cf. :g-interface-info) */
if (!was_split)
{
const GDBusMethodInfo *expected_method_info;
expected_method_info = lookup_method_info (proxy, target_method_name);
if (expected_method_info != NULL)
reply_type = _g_dbus_compute_complete_signature (expected_method_info->out_args);
}
destination = NULL;
if (proxy->priv->name != NULL)
{
destination = g_strdup (get_destination_for_call (proxy));
if (destination == NULL)
{
if (task != NULL)
{
g_task_return_new_error (task,
G_IO_ERROR,
G_IO_ERROR_FAILED,
_("Cannot invoke method; proxy is for the well-known name %s without an owner, and proxy was constructed with the G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag"),
proxy->priv->name);
g_object_unref (task);
}
G_UNLOCK (properties_lock);
goto out;
}
}
G_UNLOCK (properties_lock);
#ifdef G_OS_UNIX
g_dbus_connection_call_with_unix_fd_list (proxy->priv->connection,
destination,
proxy->priv->object_path,
target_interface_name,
target_method_name,
parameters,
reply_type,
flags,
timeout_msec == -1 ? proxy->priv->timeout_msec : timeout_msec,
fd_list,
cancellable,
my_callback,
task);
#else
g_dbus_connection_call (proxy->priv->connection,
destination,
proxy->priv->object_path,
target_interface_name,
target_method_name,
parameters,
reply_type,
flags,
timeout_msec == -1 ? proxy->priv->timeout_msec : timeout_msec,
cancellable,
my_callback,
task);
#endif
out:
if (reply_type != NULL)
g_variant_type_free (reply_type);
g_free (destination);
g_free (split_interface_name);
}
static GVariant *
g_dbus_proxy_call_finish_internal (GDBusProxy *proxy,
GUnixFDList **out_fd_list,
GAsyncResult *res,
GError **error)
{
GVariant *value;
ReplyData *data;
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
g_return_val_if_fail (g_task_is_valid (res, proxy), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
value = NULL;
data = g_task_propagate_pointer (G_TASK (res), error);
if (!data)
goto out;
value = g_variant_ref (data->value);
#ifdef G_OS_UNIX
if (out_fd_list != NULL)
*out_fd_list = data->fd_list != NULL ? g_object_ref (data->fd_list) : NULL;
#endif
reply_data_free (data);
out:
return value;
}
static GVariant *
g_dbus_proxy_call_sync_internal (GDBusProxy *proxy,
const gchar *method_name,
GVariant *parameters,
GDBusCallFlags flags,
gint timeout_msec,
GUnixFDList *fd_list,
GUnixFDList **out_fd_list,
GCancellable *cancellable,
GError **error)
{
GVariant *ret;
gboolean was_split;
gchar *split_interface_name;
const gchar *split_method_name;
const gchar *target_method_name;
const gchar *target_interface_name;
gchar *destination;
GVariantType *reply_type;
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
g_return_val_if_fail (g_dbus_is_member_name (method_name) || g_dbus_is_interface_name (method_name), NULL);
g_return_val_if_fail (parameters == NULL || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), NULL);
g_return_val_if_fail (timeout_msec == -1 || timeout_msec >= 0, NULL);
#ifdef G_OS_UNIX
g_return_val_if_fail (fd_list == NULL || G_IS_UNIX_FD_LIST (fd_list), NULL);
#else
g_return_val_if_fail (fd_list == NULL, NULL);
#endif
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
reply_type = NULL;
G_LOCK (properties_lock);
was_split = maybe_split_method_name (method_name, &split_interface_name, &split_method_name);
target_method_name = was_split ? split_method_name : method_name;
target_interface_name = was_split ? split_interface_name : proxy->priv->interface_name;
/* Warn if method is unexpected (cf. :g-interface-info) */
if (!was_split)
{
const GDBusMethodInfo *expected_method_info;
expected_method_info = lookup_method_info (proxy, target_method_name);
if (expected_method_info != NULL)
reply_type = _g_dbus_compute_complete_signature (expected_method_info->out_args);
}
destination = NULL;
if (proxy->priv->name != NULL)
{
destination = g_strdup (get_destination_for_call (proxy));
if (destination == NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
_("Cannot invoke method; proxy is for the well-known name %s without an owner, and proxy was constructed with the G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag"),
proxy->priv->name);
ret = NULL;
G_UNLOCK (properties_lock);
goto out;
}
}
G_UNLOCK (properties_lock);
#ifdef G_OS_UNIX
ret = g_dbus_connection_call_with_unix_fd_list_sync (proxy->priv->connection,
destination,
proxy->priv->object_path,
target_interface_name,
target_method_name,
parameters,
reply_type,
flags,
timeout_msec == -1 ? proxy->priv->timeout_msec : timeout_msec,
fd_list,
out_fd_list,
cancellable,
error);
#else
ret = g_dbus_connection_call_sync (proxy->priv->connection,
destination,
proxy->priv->object_path,
target_interface_name,
target_method_name,
parameters,
reply_type,
flags,
timeout_msec == -1 ? proxy->priv->timeout_msec : timeout_msec,
cancellable,
error);
#endif
out:
if (reply_type != NULL)
g_variant_type_free (reply_type);
g_free (destination);
g_free (split_interface_name);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_proxy_call:
* @proxy: A #GDBusProxy.
* @method_name: Name of method to invoke.
* @parameters: (nullable): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
* @flags: Flags from the #GDBusCallFlags enumeration.
* @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning
* "infinite") or -1 to use the proxy default timeout.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @callback: (nullable): A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
* care about the result of the method invocation.
* @user_data: The data to pass to @callback.
*
* Asynchronously invokes the @method_name method on @proxy.
*
* If @method_name contains any dots, then @name is split into interface and
* method name parts. This allows using @proxy for invoking methods on
* other interfaces.
*
* If the #GDBusConnection associated with @proxy is closed then
* the operation will fail with %G_IO_ERROR_CLOSED. If
* @cancellable is canceled, the operation will fail with
* %G_IO_ERROR_CANCELLED. If @parameters contains a value not
* compatible with the D-Bus protocol, the operation fails with
* %G_IO_ERROR_INVALID_ARGUMENT.
*
* If the @parameters #GVariant is floating, it is consumed. This allows
* convenient 'inline' use of g_variant_new(), e.g.:
* |[<!-- language="C" -->
* g_dbus_proxy_call (proxy,
* "TwoStrings",
* g_variant_new ("(ss)",
* "Thing One",
* "Thing Two"),
* G_DBUS_CALL_FLAGS_NONE,
* -1,
* NULL,
* (GAsyncReadyCallback) two_strings_done,
* &data);
* ]|
*
* If @proxy has an expected interface (see
* #GDBusProxy:g-interface-info) and @method_name is referenced by it,
* then the return value is checked against the return type.
*
* This is an asynchronous method. When the operation is finished,
* @callback will be invoked in the
* [thread-default main context][g-main-context-push-thread-default]
* of the thread you are calling this method from.
* You can then call g_dbus_proxy_call_finish() to get the result of
* the operation. See g_dbus_proxy_call_sync() for the synchronous
* version of this method.
*
* If @callback is %NULL then the D-Bus method call message will be sent with
* the %G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED flag set.
*
* Since: 2.26
*/
void
g_dbus_proxy_call (GDBusProxy *proxy,
const gchar *method_name,
GVariant *parameters,
GDBusCallFlags flags,
gint timeout_msec,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_dbus_proxy_call_internal (proxy, method_name, parameters, flags, timeout_msec, NULL, cancellable, callback, user_data);
}
/**
* g_dbus_proxy_call_finish:
* @proxy: A #GDBusProxy.
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_proxy_call().
* @error: Return location for error or %NULL.
*
* Finishes an operation started with g_dbus_proxy_call().
*
* Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
* return values. Free with g_variant_unref().
*
* Since: 2.26
*/
GVariant *
g_dbus_proxy_call_finish (GDBusProxy *proxy,
GAsyncResult *res,
GError **error)
{
return g_dbus_proxy_call_finish_internal (proxy, NULL, res, error);
}
/**
* g_dbus_proxy_call_sync:
* @proxy: A #GDBusProxy.
* @method_name: Name of method to invoke.
* @parameters: (nullable): A #GVariant tuple with parameters for the signal
* or %NULL if not passing parameters.
* @flags: Flags from the #GDBusCallFlags enumeration.
* @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning
* "infinite") or -1 to use the proxy default timeout.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Synchronously invokes the @method_name method on @proxy.
*
* If @method_name contains any dots, then @name is split into interface and
* method name parts. This allows using @proxy for invoking methods on
* other interfaces.
*
* If the #GDBusConnection associated with @proxy is disconnected then
* the operation will fail with %G_IO_ERROR_CLOSED. If
* @cancellable is canceled, the operation will fail with
* %G_IO_ERROR_CANCELLED. If @parameters contains a value not
* compatible with the D-Bus protocol, the operation fails with
* %G_IO_ERROR_INVALID_ARGUMENT.
*
* If the @parameters #GVariant is floating, it is consumed. This allows
* convenient 'inline' use of g_variant_new(), e.g.:
* |[<!-- language="C" -->
* g_dbus_proxy_call_sync (proxy,
* "TwoStrings",
* g_variant_new ("(ss)",
* "Thing One",
* "Thing Two"),
* G_DBUS_CALL_FLAGS_NONE,
* -1,
* NULL,
* &error);
* ]|
*
* The calling thread is blocked until a reply is received. See
* g_dbus_proxy_call() for the asynchronous version of this
* method.
*
* If @proxy has an expected interface (see
* #GDBusProxy:g-interface-info) and @method_name is referenced by it,
* then the return value is checked against the return type.
*
* Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
* return values. Free with g_variant_unref().
*
* Since: 2.26
*/
GVariant *
g_dbus_proxy_call_sync (GDBusProxy *proxy,
const gchar *method_name,
GVariant *parameters,
GDBusCallFlags flags,
gint timeout_msec,
GCancellable *cancellable,
GError **error)
{
return g_dbus_proxy_call_sync_internal (proxy, method_name, parameters, flags, timeout_msec, NULL, NULL, cancellable, error);
}
/* ---------------------------------------------------------------------------------------------------- */
#ifdef G_OS_UNIX
/**
* g_dbus_proxy_call_with_unix_fd_list:
* @proxy: A #GDBusProxy.
* @method_name: Name of method to invoke.
* @parameters: (nullable): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
* @flags: Flags from the #GDBusCallFlags enumeration.
* @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning
* "infinite") or -1 to use the proxy default timeout.
* @fd_list: (nullable): A #GUnixFDList or %NULL.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @callback: (nullable): A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
* care about the result of the method invocation.
* @user_data: The data to pass to @callback.
*
* Like g_dbus_proxy_call() but also takes a #GUnixFDList object.
*
* This method is only available on UNIX.
*
* Since: 2.30
*/
void
g_dbus_proxy_call_with_unix_fd_list (GDBusProxy *proxy,
const gchar *method_name,
GVariant *parameters,
GDBusCallFlags flags,
gint timeout_msec,
GUnixFDList *fd_list,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_dbus_proxy_call_internal (proxy, method_name, parameters, flags, timeout_msec, fd_list, cancellable, callback, user_data);
}
/**
* g_dbus_proxy_call_with_unix_fd_list_finish:
* @proxy: A #GDBusProxy.
* @out_fd_list: (out) (optional): Return location for a #GUnixFDList or %NULL.
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_proxy_call_with_unix_fd_list().
* @error: Return location for error or %NULL.
*
* Finishes an operation started with g_dbus_proxy_call_with_unix_fd_list().
*
* Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
* return values. Free with g_variant_unref().
*
* Since: 2.30
*/
GVariant *
g_dbus_proxy_call_with_unix_fd_list_finish (GDBusProxy *proxy,
GUnixFDList **out_fd_list,
GAsyncResult *res,
GError **error)
{
return g_dbus_proxy_call_finish_internal (proxy, out_fd_list, res, error);
}
/**
* g_dbus_proxy_call_with_unix_fd_list_sync:
* @proxy: A #GDBusProxy.
* @method_name: Name of method to invoke.
* @parameters: (nullable): A #GVariant tuple with parameters for the signal
* or %NULL if not passing parameters.
* @flags: Flags from the #GDBusCallFlags enumeration.
* @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning
* "infinite") or -1 to use the proxy default timeout.
* @fd_list: (nullable): A #GUnixFDList or %NULL.
* @out_fd_list: (out) (optional): Return location for a #GUnixFDList or %NULL.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Like g_dbus_proxy_call_sync() but also takes and returns #GUnixFDList objects.
*
* This method is only available on UNIX.
*
* Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
* return values. Free with g_variant_unref().
*
* Since: 2.30
*/
GVariant *
g_dbus_proxy_call_with_unix_fd_list_sync (GDBusProxy *proxy,
const gchar *method_name,
GVariant *parameters,
GDBusCallFlags flags,
gint timeout_msec,
GUnixFDList *fd_list,
GUnixFDList **out_fd_list,
GCancellable *cancellable,
GError **error)
{
return g_dbus_proxy_call_sync_internal (proxy, method_name, parameters, flags, timeout_msec, fd_list, out_fd_list, cancellable, error);
}
#endif /* G_OS_UNIX */
/* ---------------------------------------------------------------------------------------------------- */
static GDBusInterfaceInfo *
_g_dbus_proxy_get_info (GDBusInterface *interface)
{
GDBusProxy *proxy = G_DBUS_PROXY (interface);
return g_dbus_proxy_get_interface_info (proxy);
}
static GDBusObject *
_g_dbus_proxy_get_object (GDBusInterface *interface)
{
GDBusProxy *proxy = G_DBUS_PROXY (interface);
return proxy->priv->object;
}
static GDBusObject *
_g_dbus_proxy_dup_object (GDBusInterface *interface)
{
GDBusProxy *proxy = G_DBUS_PROXY (interface);
GDBusObject *ret = NULL;
G_LOCK (properties_lock);
if (proxy->priv->object != NULL)
ret = g_object_ref (proxy->priv->object);
G_UNLOCK (properties_lock);
return ret;
}
static void
_g_dbus_proxy_set_object (GDBusInterface *interface,
GDBusObject *object)
{
GDBusProxy *proxy = G_DBUS_PROXY (interface);
G_LOCK (properties_lock);
if (proxy->priv->object != NULL)
g_object_remove_weak_pointer (G_OBJECT (proxy->priv->object), (gpointer *) &proxy->priv->object);
proxy->priv->object = object;
if (proxy->priv->object != NULL)
g_object_add_weak_pointer (G_OBJECT (proxy->priv->object), (gpointer *) &proxy->priv->object);
G_UNLOCK (properties_lock);
}
static void
dbus_interface_iface_init (GDBusInterfaceIface *dbus_interface_iface)
{
dbus_interface_iface->get_info = _g_dbus_proxy_get_info;
dbus_interface_iface->get_object = _g_dbus_proxy_get_object;
dbus_interface_iface->dup_object = _g_dbus_proxy_dup_object;
dbus_interface_iface->set_object = _g_dbus_proxy_set_object;
}
/* ---------------------------------------------------------------------------------------------------- */
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