/* GDBus - GLib D-Bus Library * * Copyright (C) 2008-2010 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, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * * Author: David Zeuthen */ #include "config.h" #include #include #include "gdbusutils.h" #include "gdbusproxy.h" #include "gioenumtypes.h" #include "gdbusconnection.h" #include "gdbuserror.h" #include "gdbusprivate.h" #include "gio-marshal.h" #include "ginitable.h" #include "gasyncinitable.h" #include "gioerror.h" #include "gasyncresult.h" #include "gsimpleasyncresult.h" #include "gcancellable.h" #include "glibintl.h" /** * SECTION:gdbusproxy * @short_description: Client-side proxies * @include: gio/gio.h * * #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 gets * emitted. This behaviour can be changed by passing suitable * #GDBusProxyFlags 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. * * If a #GDBusProxy is used for a well-known name, the owner of the * name is tracked and can be read from * #GDBusProxy:g-name-owner. Connect to the #GObject::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). * * The generic #GDBusProxy::g-properties-changed and #GDBusProxy::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. * * See for an example. * * GDBusProxy for a well-known-nameFIXME: MISSING XINCLUDE CONTENT */ struct _GDBusProxyPrivate { GBusType bus_type; GDBusConnection *connection; GDBusProxyFlags flags; gchar *name; gchar *name_owner; gchar *object_path; gchar *interface_name; gint timeout_msec; guint name_owner_changed_subscription_id; GCancellable *get_all_cancellable; /* gchar* -> GVariant* */ GHashTable *properties; GDBusInterfaceInfo *expected_interface; guint properties_changed_subscriber_id; guint signals_subscriber_id; gboolean initialized; }; 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, }; guint signals[LAST_SIGNAL] = {0}; 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_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_subscriber_id > 0) g_dbus_connection_signal_unsubscribe (proxy->priv->connection, proxy->priv->properties_changed_subscriber_id); if (proxy->priv->signals_subscriber_id > 0) g_dbus_connection_signal_unsubscribe (proxy->priv->connection, proxy->priv->signals_subscriber_id); 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_unref (proxy->priv->expected_interface); 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_set_string (value, proxy->priv->name_owner); 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, proxy->priv->timeout_msec); 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. For example, when completing a method call, if the * type signature of the message isn't what's expected, the given * #GError is set. Signals that have a type signature mismatch are * simply dropped. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_INTERFACE_INFO, g_param_spec_boxed ("g-interface-info", P_("Interface Information"), P_("Interface Information"), 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", P_("g-connection"), P_("The connection the proxy is for"), 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", P_("Bus Type"), P_("The bus to connect to, if any"), 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", P_("g-flags"), P_("Flags for the proxy"), 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", P_("g-name"), P_("The well-known or unique name that the proxy is for"), 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: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", P_("g-name-owner"), P_("The unique name for the owner"), 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", P_("g-object-path"), P_("The object path the proxy is for"), 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", P_("g-interface-name"), P_("The D-Bus interface name the proxy is for"), 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", P_("Default Timeout"), P_("Timeout for remote method invocation"), -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 * @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). * * 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 ("g-properties-changed", G_TYPE_DBUS_PROXY, G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GDBusProxyClass, g_properties_changed), NULL, NULL, _gio_marshal_VOID__VARIANT_BOXED, G_TYPE_NONE, 2, G_TYPE_VARIANT, G_TYPE_STRV | G_SIGNAL_TYPE_STATIC_SCOPE); /** * GDBusProxy::g-signal: * @proxy: The #GDBusProxy emitting the signal. * @sender_name: 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: 2.26 */ signals[SIGNAL_SIGNAL] = g_signal_new ("g-signal", G_TYPE_DBUS_PROXY, G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GDBusProxyClass, g_signal), NULL, NULL, _gio_marshal_VOID__STRING_STRING_VARIANT, G_TYPE_NONE, 3, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_VARIANT); g_type_class_add_private (klass, sizeof (GDBusProxyPrivate)); } static void g_dbus_proxy_init (GDBusProxy *proxy) { proxy->priv = G_TYPE_INSTANCE_GET_PRIVATE (proxy, G_TYPE_DBUS_PROXY, GDBusProxyPrivate); proxy->priv->properties = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_variant_unref); } /* ---------------------------------------------------------------------------------------------------- */ static gint property_name_sort_func (const gchar **a, const gchar **b) { return g_strcmp0 (*a, *b); } /** * g_dbus_proxy_get_cached_property_names: * @proxy: A #GDBusProxy. * * Gets the names of all cached properties on @proxy. * * Returns: 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); 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 (p, (GCompareFunc) property_name_sort_func); g_ptr_array_add (p, NULL); names = (gchar **) g_ptr_array_free (p, FALSE); out: return names; } static const GDBusPropertyInfo * lookup_property_info_or_warn (GDBusProxy *proxy, const gchar *property_name) { const GDBusPropertyInfo *info; if (proxy->priv->expected_interface == NULL) return NULL; info = g_dbus_interface_info_lookup_property (proxy->priv->expected_interface, property_name); if (info == NULL) { g_warning ("Trying to lookup property %s which isn't in expected interface %s", property_name, proxy->priv->expected_interface->name); } 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), then @property_name (for existence) * is checked against it. * * Returns: 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) { GVariant *value; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); g_return_val_if_fail (property_name != NULL, NULL); value = g_hash_table_lookup (proxy->priv->properties, property_name); if (value == NULL) { const GDBusPropertyInfo *info; info = lookup_property_info_or_warn (proxy, property_name); /* no difference */ goto out; } g_variant_ref (value); out: return value; } /** * g_dbus_proxy_set_cached_property: * @proxy: A #GDBusProxy * @property_name: Property name. * @value: 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), then @property_name (for existence) * and @value (for the type) is checked against it. * * If the @value #GVariant is floating, it is consumed. This allows * convenient 'inline' use of g_variant_new(), e.g. * |[ * 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); if (value != NULL) { info = lookup_property_info_or_warn (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: ; } /* ---------------------------------------------------------------------------------------------------- */ 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) { GDBusProxy *proxy = G_DBUS_PROXY (user_data); if (!proxy->priv->initialized) goto out; if (proxy->priv->name_owner != NULL && g_strcmp0 (sender_name, proxy->priv->name_owner) != 0) goto out; g_signal_emit (proxy, signals[SIGNAL_SIGNAL], 0, sender_name, signal_name, parameters); out: ; } /* ---------------------------------------------------------------------------------------------------- */ 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) { GDBusProxy *proxy = G_DBUS_PROXY (user_data); GError *error; const gchar *interface_name_for_signal; GVariant *changed_properties; gchar **invalidated_properties; GVariantIter iter; gchar *key; GVariant *value; guint n; error = NULL; changed_properties = NULL; invalidated_properties = NULL; if (!proxy->priv->initialized) goto out; if (proxy->priv->name_owner != NULL && g_strcmp0 (sender_name, proxy->priv->name_owner) != 0) 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)); 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) goto out; g_variant_iter_init (&iter, changed_properties); while (g_variant_iter_next (&iter, "{sv}", &key, &value)) { g_hash_table_insert (proxy->priv->properties, key, /* adopts string */ value); /* adopts value */ } for (n = 0; invalidated_properties[n] != NULL; n++) { g_hash_table_remove (proxy->priv->properties, invalidated_properties[n]); } /* emit signal */ g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL], 0, changed_properties, invalidated_properties); out: if (changed_properties != NULL) g_variant_unref (changed_properties); g_free (invalidated_properties); } /* ---------------------------------------------------------------------------------------------------- */ static void process_get_all_reply (GDBusProxy *proxy, GVariant *result) { GVariantIter *iter; gchar *key; GVariant *value; 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_variant_get (result, "(a{sv})", &iter); while (g_variant_iter_next (iter, "{sv}", &key, &value)) { g_hash_table_insert (proxy->priv->properties, key, /* adopts string */ value); /* adopts value */ } g_variant_iter_free (iter); /* Synthesize ::g-properties-changed changed */ if (g_hash_table_size (proxy->priv->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(). * * TODO: handle G_DBUS_DEBUG flag 'proxy' and, if enabled, log the * fact that GetAll() failed */ //g_debug ("error: %d %d %s", error->domain, error->code, error->message); g_error_free (error); } /* and finally we can notify */ if (!cancelled) { g_free (data->proxy->priv->name_owner); data->proxy->priv->name_owner = data->name_owner; data->name_owner = NULL; /* to avoid an extra copy, we steal the string */ g_hash_table_remove_all (data->proxy->priv->properties); 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) { GDBusProxy *proxy = G_DBUS_PROXY (user_data); const gchar *old_owner; const gchar *new_owner; /* 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_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; GVariant *changed_properties; 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}")); changed_properties = g_variant_builder_end (&builder); 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); /* ... and finally emit the ::g-properties-changed signal */ g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL], 0, changed_properties, (const gchar* const *) invalidated_properties->pdata); g_variant_unref (changed_properties); g_ptr_array_unref (invalidated_properties); } g_object_notify (G_OBJECT (proxy), "g-name-owner"); } else { /* ignore duplicates - this can happen when activating the service */ if (g_strcmp0 (new_owner, proxy->priv->name_owner) == 0) 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_object_notify (G_OBJECT (proxy), "g-name-owner"); } else { LoadPropertiesOnNameOwnerChangedData *data; /* 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, "org.freedesktop.DBus.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: ; } /* ---------------------------------------------------------------------------------------------------- */ typedef struct { GDBusProxy *proxy; GCancellable *cancellable; GSimpleAsyncResult *simple; } AsyncInitData; static void async_init_data_free (AsyncInitData *data) { g_object_unref (data->proxy); if (data->cancellable != NULL) g_object_unref (data->cancellable); g_object_unref (data->simple); g_free (data); } static void async_init_get_all_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { AsyncInitData *data = 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(). * * TODO: handle G_DBUS_DEBUG flag 'proxy' and, if enabled, log the * fact that GetAll() failed */ //g_debug ("error: %d %d %s", error->domain, error->code, error->message); g_error_free (error); } else { g_simple_async_result_set_op_res_gpointer (data->simple, result, (GDestroyNotify) g_variant_unref); } g_simple_async_result_complete_in_idle (data->simple); async_init_data_free (data); } static void async_init_get_name_owner_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { AsyncInitData *data = user_data; if (res != NULL) { 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); } else { g_simple_async_result_set_from_error (data->simple, error); g_error_free (error); g_simple_async_result_complete_in_idle (data->simple); async_init_data_free (data); goto out; } } else { g_variant_get (result, "(s)", &data->proxy->priv->name_owner); g_variant_unref (result); } } if (!(data->proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES)) { /* load all properties asynchronously */ g_dbus_connection_call (data->proxy->priv->connection, data->proxy->priv->name_owner, data->proxy->priv->object_path, "org.freedesktop.DBus.Properties", "GetAll", g_variant_new ("(s)", data->proxy->priv->interface_name), G_VARIANT_TYPE ("(a{sv})"), G_DBUS_CALL_FLAGS_NONE, -1, /* timeout */ data->cancellable, (GAsyncReadyCallback) async_init_get_all_cb, data); } else { g_simple_async_result_complete_in_idle (data->simple); async_init_data_free (data); } out: ; } static void async_init_call_get_name_owner (AsyncInitData *data) { g_dbus_connection_call (data->proxy->priv->connection, "org.freedesktop.DBus", /* name */ "/org/freedesktop/DBus", /* object path */ "org.freedesktop.DBus", /* interface */ "GetNameOwner", g_variant_new ("(s)", data->proxy->priv->name), G_VARIANT_TYPE ("(s)"), G_DBUS_CALL_FLAGS_NONE, -1, /* timeout */ data->cancellable, (GAsyncReadyCallback) async_init_get_name_owner_cb, data); } static void async_init_start_service_by_name_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { AsyncInitData *data = user_data; 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 * * This doesn't mean that the name doesn't have an owner, just * that it's not provided by a .service file. So just proceed to * invoke GetNameOwner() if dealing with that error. */ if (error->domain == G_DBUS_ERROR && error->code == G_DBUS_ERROR_SERVICE_UNKNOWN) { g_error_free (error); } else { g_prefix_error (&error, _("Error calling StartServiceByName for %s: "), data->proxy->priv->name); goto failed; } } else { guint32 start_service_result; g_variant_get (result, "(u)", &start_service_result); g_variant_unref (result); if (start_service_result == 1 || /* DBUS_START_REPLY_SUCCESS */ start_service_result == 2) /* 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, data->proxy->priv->name); goto failed; } } async_init_call_get_name_owner (data); return; failed: g_warn_if_fail (error != NULL); g_simple_async_result_set_from_error (data->simple, error); g_error_free (error); g_simple_async_result_complete_in_idle (data->simple); async_init_data_free (data); } static void async_init_call_start_service_by_name (AsyncInitData *data) { g_dbus_connection_call (data->proxy->priv->connection, "org.freedesktop.DBus", /* name */ "/org/freedesktop/DBus", /* object path */ "org.freedesktop.DBus", /* interface */ "StartServiceByName", g_variant_new ("(su)", data->proxy->priv->name, 0), G_VARIANT_TYPE ("(u)"), G_DBUS_CALL_FLAGS_NONE, -1, /* timeout */ data->cancellable, (GAsyncReadyCallback) async_init_start_service_by_name_cb, data); } 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); AsyncInitData *data; data = g_new0 (AsyncInitData, 1); data->proxy = g_object_ref (proxy); data->cancellable = cancellable != NULL ? g_object_ref (cancellable) : NULL; data->simple = g_simple_async_result_new (G_OBJECT (proxy), callback, user_data, NULL); /* Check name ownership asynchronously - possibly also start the service */ if (proxy->priv->name == NULL) { /* Do nothing */ async_init_get_name_owner_cb (proxy->priv->connection, NULL, data); } else if (g_dbus_is_unique_name (proxy->priv->name)) { proxy->priv->name_owner = g_strdup (proxy->priv->name); async_init_get_name_owner_cb (proxy->priv->connection, NULL, data); } else { if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START) { async_init_call_get_name_owner (data); } else { async_init_call_start_service_by_name (data); } } } static gboolean async_initable_init_second_finish (GAsyncInitable *initable, GAsyncResult *res, GError **error) { GDBusProxy *proxy = G_DBUS_PROXY (initable); GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res); GVariant *result; gboolean ret; ret = FALSE; if (g_simple_async_result_propagate_error (simple, error)) goto out; result = g_simple_async_result_get_op_res_gpointer (simple); if (result != NULL) { process_get_all_reply (proxy, result); } ret = TRUE; out: proxy->priv->initialized = TRUE; return ret; } /* ---------------------------------------------------------------------------------------------------- */ static void async_initable_init_first (GAsyncInitable *initable) { GDBusProxy *proxy = G_DBUS_PROXY (initable); if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES)) { /* subscribe to PropertiesChanged() */ proxy->priv->properties_changed_subscriber_id = g_dbus_connection_signal_subscribe (proxy->priv->connection, proxy->priv->name, "org.freedesktop.DBus.Properties", "PropertiesChanged", proxy->priv->object_path, proxy->priv->interface_name, G_DBUS_SIGNAL_FLAGS_NONE, on_properties_changed, proxy, NULL); } if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS)) { /* subscribe to all signals for the object */ proxy->priv->signals_subscriber_id = g_dbus_connection_signal_subscribe (proxy->priv->connection, proxy->priv->name, proxy->priv->interface_name, NULL, /* member */ proxy->priv->object_path, NULL, /* arg0 */ G_DBUS_SIGNAL_FLAGS_NONE, on_signal_received, proxy, NULL); } if (proxy->priv->name != NULL && !g_dbus_is_unique_name (proxy->priv->name)) { proxy->priv->name_owner_changed_subscription_id = g_dbus_connection_signal_subscribe (proxy->priv->connection, "org.freedesktop.DBus", /* name */ "org.freedesktop.DBus", /* interface */ "NameOwnerChanged", /* signal name */ "/org/freedesktop/DBus", /* path */ proxy->priv->name, /* arg0 */ G_DBUS_SIGNAL_FLAGS_NONE, on_name_owner_changed, proxy, NULL); } } /* ---------------------------------------------------------------------------------------------------- */ /* initialization is split into two parts - the first is the * non-blocing 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. */ typedef struct { GDBusProxy *proxy; gint io_priority; GCancellable *cancellable; GAsyncReadyCallback callback; gpointer user_data; } GetConnectionData; static void get_connection_cb (GObject *source_object, GAsyncResult *res, gpointer user_data) { GetConnectionData *data = user_data; GError *error; error = NULL; data->proxy->priv->connection = g_bus_get_finish (res, &error); if (data->proxy->priv->connection == NULL) { GSimpleAsyncResult *simple; simple = g_simple_async_result_new (G_OBJECT (data->proxy), data->callback, data->user_data, NULL); g_simple_async_result_set_from_error (simple, error); g_error_free (error); g_simple_async_result_complete_in_idle (simple); g_object_unref (simple); } else { async_initable_init_first (G_ASYNC_INITABLE (data->proxy)); async_initable_init_second_async (G_ASYNC_INITABLE (data->proxy), data->io_priority, data->cancellable, data->callback, data->user_data); } if (data->cancellable != NULL) g_object_unref (data->cancellable); if (data->proxy != NULL) g_object_unref (data->proxy); g_free (data); } static void async_initable_init_async (GAsyncInitable *initable, gint io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GDBusProxy *proxy = G_DBUS_PROXY (initable); if (proxy->priv->bus_type != G_BUS_TYPE_NONE) { GetConnectionData *data; g_assert (proxy->priv->connection == NULL); data = g_new0 (GetConnectionData, 1); data->proxy = g_object_ref (proxy); data->io_priority = io_priority; data->cancellable = cancellable != NULL ? g_object_ref (cancellable) : NULL; data->callback = callback; data->user_data = user_data; g_bus_get (proxy->priv->bus_type, cancellable, get_connection_cb, data); } else { async_initable_init_first (initable); async_initable_init_second_async (initable, io_priority, cancellable, callback, user_data); } } static gboolean async_initable_init_finish (GAsyncInitable *initable, GAsyncResult *res, GError **error) { return async_initable_init_second_finish (initable, 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: A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL. * @name: 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: 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 @name is a well-known name and the * %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag isn'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. * * See for an example of how #GDBusProxy can be used. * * 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_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: 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: (allow-none): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL. * @name: (allow-none): 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: (allow-none): A #GCancellable or %NULL. * @error: (allow-none): 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 @name is a well-known name and the * %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag isn'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. * * See for an example of how #GDBusProxy can be used. * * Returns: 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: 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: 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. * * See for an example of how #GDBusProxy can be used. * * 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_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: 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: 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: 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. * * See for an example of how #GDBusProxy can be used. * * Returns: 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_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: 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. * * Returns: 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: 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) { g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); return g_strdup (proxy->priv->name_owner); } /** * g_dbus_proxy_get_object_path: * @proxy: A #GDBusProxy. * * Gets the object path @proxy is for. * * Returns: 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: 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) { g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), -1); return proxy->priv->timeout_msec; } /** * 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); /* TODO: locking? */ if (proxy->priv->timeout_msec != timeout_msec) { proxy->priv->timeout_msec = timeout_msec; g_object_notify (G_OBJECT (proxy), "g-default-timeout"); } } /** * g_dbus_proxy_get_interface_info: * @proxy: A #GDBusProxy * * Returns the #GDBusInterfaceInfo, if any, specifying the minimal * interface that @proxy conforms to. * * See the #GDBusProxy:g-interface-info property for more details. * * Returns: 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) { g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); return proxy->priv->expected_interface; } /** * g_dbus_proxy_set_interface_info: * @proxy: A #GDBusProxy * @info: Minimum interface this proxy conforms to or %NULL to unset. * * Ensure that interactions with @proxy conform to the given * interface. For example, when completing a method call, if the type * signature of the message isn't what's expected, the given #GError * is set. Signals that have a type signature mismatch are simply * dropped. * * 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)); if (proxy->priv->expected_interface != NULL) g_dbus_interface_info_unref (proxy->priv->expected_interface); proxy->priv->expected_interface = info != NULL ? g_dbus_interface_info_ref (info) : NULL; } /* ---------------------------------------------------------------------------------------------------- */ 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; } static void reply_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data); GVariant *value; GError *error; error = NULL; value = g_dbus_connection_call_finish (connection, res, &error); if (error != NULL) { g_simple_async_result_set_from_error (simple, error); g_error_free (error); } else { g_simple_async_result_set_op_res_gpointer (simple, value, (GDestroyNotify) g_variant_unref); } /* no need to complete in idle since the method GDBusConnection already does */ g_simple_async_result_complete (simple); g_object_unref (simple); } static const GDBusMethodInfo * lookup_method_info_or_warn (GDBusProxy *proxy, const gchar *method_name) { const GDBusMethodInfo *info; if (proxy->priv->expected_interface == NULL) return NULL; info = g_dbus_interface_info_lookup_method (proxy->priv->expected_interface, method_name); if (info == NULL) { g_warning ("Trying to invoke method %s which isn't in expected interface %s", method_name, proxy->priv->expected_interface->name); } return info; } 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; } /** * g_dbus_proxy_call: * @proxy: A #GDBusProxy. * @method_name: Name of method to invoke. * @parameters: 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 or -1 to use the proxy default timeout. * @cancellable: A #GCancellable or %NULL. * @callback: 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.: * |[ * 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); * ]| * * This is an asynchronous method. When the operation is finished, * @callback will be invoked in the * thread-default * main loop 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. * * 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) { GSimpleAsyncResult *simple; gboolean was_split; gchar *split_interface_name; const gchar *split_method_name; const gchar *target_method_name; const gchar *target_interface_name; const gchar *destination; GVariantType *reply_type; 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); reply_type = NULL; split_interface_name = NULL; simple = g_simple_async_result_new (G_OBJECT (proxy), callback, user_data, g_dbus_proxy_call); 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_or_warn (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 = get_destination_for_call (proxy); if (destination == NULL) { g_simple_async_result_set_error (simple, G_IO_ERROR, G_IO_ERROR_FAILED, _("Cannot invoke method; proxy is for a well-known name without an owner and proxy was constructed with the G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag")); goto out; } } 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, (GAsyncReadyCallback) reply_cb, simple); out: if (reply_type != NULL) g_variant_type_free (reply_type); g_free (split_interface_name); } /** * 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) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res); GVariant *value; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL); g_return_val_if_fail (error == NULL || *error == NULL, NULL); g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_proxy_call); value = NULL; if (g_simple_async_result_propagate_error (simple, error)) goto out; value = g_variant_ref (g_simple_async_result_get_op_res_gpointer (simple)); out: return value; } /** * g_dbus_proxy_call_sync: * @proxy: A #GDBusProxy. * @method_name: Name of method to invoke. * @parameters: 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 or -1 to use the proxy default timeout. * @cancellable: 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.: * |[ * 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. * * 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) { GVariant *ret; gboolean was_split; gchar *split_interface_name; const gchar *split_method_name; const gchar *target_method_name; const gchar *target_interface_name; const 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); g_return_val_if_fail (error == NULL || *error == NULL, NULL); reply_type = NULL; 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_or_warn (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 = get_destination_for_call (proxy); if (destination == NULL) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED, _("Cannot invoke method; proxy is for a well-known name without an owner and proxy was constructed with the G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag")); ret = NULL; goto out; } } 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); out: if (reply_type != NULL) g_variant_type_free (reply_type); g_free (split_interface_name); return ret; } /* ---------------------------------------------------------------------------------------------------- */