Struct DBusConnection

pub struct DBusConnection { /* private fields */ }

The GDBusConnection type is used for D-Bus connections to remote peers such as a message buses.

It is a low-level API that offers a lot of flexibility. For instance, it lets you establish a connection over any transport that can by represented as a IOStream.

This class is rarely used directly in D-Bus clients. If you are writing a D-Bus client, it is often easier to use the bus_own_name(), bus_watch_name() or DBusProxy::for_bus() APIs.

As an exception to the usual GLib rule that a particular object must not be used by two threads at the same time, GDBusConnections methods may be called from any thread. This is so that bus_get() and bus_get_sync() can safely return the same GDBusConnection when called from any thread.

Most of the ways to obtain a GDBusConnection automatically initialize it (i.e. connect to D-Bus): for instance, new() and bus_get(), and the synchronous versions of those methods, give you an initialized connection. Language bindings for GIO should use Initable::new() or [AsyncInitable::new_async()][crate::AsyncInitable::new_async()], which also initialize the connection.

If you construct an uninitialized GDBusConnection, such as via glib::Object::new(), you must initialize it via InitableExt::init() or AsyncInitableExt::init_async() before using its methods or properties. Calling methods or accessing properties on a GDBusConnection that has not completed initialization successfully is considered to be invalid, and leads to undefined behaviour. In particular, if initialization fails with a GError, the only valid thing you can do with that GDBusConnection is to free it with GObject::Object::unref().

An example D-Bus server

Here is an example for a D-Bus server: gdbus-example-server.c

An example for exporting a subtree

Here is an example for exporting a subtree: gdbus-example-subtree.c

An example for file descriptor passing

Here is an example for passing UNIX file descriptors: gdbus-unix-fd-client.c

An example for exporting a GObject

Here is an example for exporting a #GObject: gdbus-example-export.c

Properties

address

A D-Bus address specifying potential endpoints that can be used when establishing the connection.

Writeable | Construct Only

authentication-observer

A #GDBusAuthObserver object to assist in the authentication process or None.

Writeable | Construct Only

capabilities

Flags from the #GDBusCapabilityFlags enumeration representing connection features negotiated with the other peer.

Readable

closed

A boolean specifying whether the connection has been closed.

Readable

exit-on-close

A boolean specifying whether the process will be terminated (by calling raise(SIGTERM)) if the connection is closed by the remote peer.

Note that #GDBusConnection objects returned by g_bus_get_finish() and g_bus_get_sync() will (usually) have this property set to true.

Readable | Writeable

flags

Flags from the #GDBusConnectionFlags enumeration.

Readable | Writeable | Construct Only

guid

The GUID of the peer performing the role of server when authenticating.

If you are constructing a #GDBusConnection and pass DBusConnectionFlags::AUTHENTICATION_SERVER in the #GDBusConnection:flags property then you must also set this property to a valid guid.

If you are constructing a #GDBusConnection and pass DBusConnectionFlags::AUTHENTICATION_CLIENT in the #GDBusConnection:flags property you will be able to read the GUID of the other peer here after the connection has been successfully initialized.

Note that the D-Bus specification uses the term ‘UUID’ to refer to this, whereas GLib consistently uses the term ‘GUID’ for historical reasons.

Despite its name, the format of #GDBusConnection:guid does not follow RFC 4122 or the Microsoft GUID format.

Readable | Writeable | Construct Only

stream

The underlying #GIOStream used for I/O.

If this is passed on construction and is a #GSocketConnection, then the corresponding #GSocket will be put into non-blocking mode.

While the #GDBusConnection is active, it will interact with this stream from a worker thread, so it is not safe to interact with the stream directly.

Readable | Writeable | Construct Only

unique-name

The unique name as assigned by the message bus or None if the connection is not open or not a message bus connection.

Readable

Signals

closed

Emitted when the connection is closed.

The cause of this event can be

• If g_dbus_connection_close() is called. In this case @remote_peer_vanished is set to false and @error is None.

• If the remote peer closes the connection. In this case @remote_peer_vanished is set to true and @error is set.

• If the remote peer sends invalid or malformed data. In this case @remote_peer_vanished is set to false and @error is set.

Upon receiving this signal, you should give up your reference to @connection. You are guaranteed that this signal is emitted only once.

Implements

[trait@glib::ObjectExt], AsyncInitableExt, InitableExt

GLib type: GObject with reference counted clone semantics.

Implementations

impl DBusConnection

pub fn register_object<'a>( &'a self, object_path: &'a str, interface_info: &'a DBusInterfaceInfo, ) -> RegistrationBuilder<'a>

Registers callbacks for exported objects at @object_path with the D-Bus interface that is described in @interface_info.

Calls to functions in @vtable (and @user_data_free_func) will happen in the [thread-default main context][g-main-context-push-thread-default] of the thread you are calling this method from.

Note that all #GVariant values passed to functions in @vtable will match the signature given in @interface_info - if a remote caller passes incorrect values, the org.freedesktop.DBus.Error.InvalidArgs is returned to the remote caller.

Additionally, if the remote caller attempts to invoke methods or access properties not mentioned in @interface_info the org.freedesktop.DBus.Error.UnknownMethod resp. org.freedesktop.DBus.Error.InvalidArgs errors are returned to the caller.

It is considered a programming error if the #GDBusInterfaceGetPropertyFunc function in @vtable returns a #GVariant of incorrect type.

If an existing callback is already registered at @object_path and @interface_name, then @error is set to IOErrorEnum::Exists.

GDBus automatically implements the standard D-Bus interfaces org.freedesktop.DBus.Properties, org.freedesktop.DBus.Introspectable and org.freedesktop.Peer, so you don’t have to implement those for the objects you export. You can implement org.freedesktop.DBus.Properties yourself, e.g. to handle getting and setting of properties asynchronously.

Note that the reference count on @interface_info will be incremented by 1 (unless allocated statically, e.g. if the reference count is -1, see g_dbus_interface_info_ref()) for as long as the object is exported. Also note that @vtable will be copied.

See this [server][gdbus-server] for an example of how to use this method.

object_path

the object path to register at

interface_info

introspection data for the interface

vtable

a #GDBusInterfaceVTable to call into or None

Returns

0 if @error is set, otherwise a registration id (never 0) that can be used with g_dbus_connection_unregister_object()

pub fn unregister_object( &self, registration_id: RegistrationId, ) -> Result<(), BoolError>

Unregisters an object.

registration_id

a registration id obtained from g_dbus_connection_register_object()

Returns

true if the object was unregistered, false otherwise

pub fn export_action_group<P: IsA<ActionGroup>>( &self, object_path: &str, action_group: &P, ) -> Result<ActionGroupExportId, Error>

Exports @action_group on @self at @object_path.

The implemented D-Bus API should be considered private. It is subject to change in the future.

A given object path can only have one action group exported on it. If this constraint is violated, the export will fail and 0 will be returned (with @error set accordingly).

You can unexport the action group using unexport_action_group() with the return value of this function.

The thread default main context is taken at the time of this call. All incoming action activations and state change requests are reported from this context. Any changes on the action group that cause it to emit signals must also come from this same context. Since incoming action activations and state change requests are rather likely to cause changes on the action group, this effectively limits a given action group to being exported from only one main context.

object_path

a D-Bus object path

action_group

an action group

Returns

the ID of the export (never zero), or 0 in case of failure

pub fn unexport_action_group(&self, export_id: ActionGroupExportId)

Reverses the effect of a previous call to export_action_group().

It is an error to call this function with an ID that wasn’t returned from export_action_group() or to call it with the same ID more than once.

export_id

the ID from export_action_group()

pub fn export_menu_model<P: IsA<MenuModel>>( &self, object_path: &str, menu: &P, ) -> Result<MenuModelExportId, Error>

Exports @menu on @self at @object_path.

The implemented D-Bus API should be considered private. It is subject to change in the future.

An object path can only have one menu model exported on it. If this constraint is violated, the export will fail and 0 will be returned (with @error set accordingly).

Exporting menus with sections containing more than G_MENU_EXPORTER_MAX_SECTION_SIZE items is not supported and results in undefined behavior.

You can unexport the menu model using g_dbus_connection_unexport_menu_model() with the return value of this function.

object_path

a D-Bus object path

menu

a #GMenuModel

Returns

the ID of the export (never zero), or 0 in case of failure

pub fn unexport_menu_model(&self, export_id: MenuModelExportId)

Reverses the effect of a previous call to g_dbus_connection_export_menu_model().

It is an error to call this function with an ID that wasn’t returned from g_dbus_connection_export_menu_model() or to call it with the same ID more than once.

export_id

the ID from g_dbus_connection_export_menu_model()

pub fn add_filter<P: Fn(&DBusConnection, &DBusMessage, bool) -> Option<DBusMessage> + 'static>( &self, filter_function: P, ) -> FilterId

Adds a message filter. Filters are handlers that are run on all incoming and outgoing messages, prior to standard dispatch. Filters are run in the order that they were added. The same handler can be added as a filter more than once, in which case it will be run more than once. Filters added during a filter callback won’t be run on the message being processed. Filter functions are allowed to modify and even drop messages.

Note that filters are run in a dedicated message handling thread so they can’t block and, generally, can’t do anything but signal a worker thread. Also note that filters are rarely needed - use API such as g_dbus_connection_send_message_with_reply(), g_dbus_connection_signal_subscribe() or g_dbus_connection_call() instead.

If a filter consumes an incoming message the message is not dispatched anywhere else - not even the standard dispatch machinery (that API such as g_dbus_connection_signal_subscribe() and g_dbus_connection_send_message_with_reply() relies on) will see the message. Similarly, if a filter consumes an outgoing message, the message will not be sent to the other peer.

If @user_data_free_func is non-None, it will be called (in the thread-default main context of the thread you are calling this method from) at some point after @user_data is no longer needed. (It is not guaranteed to be called synchronously when the filter is removed, and may be called after @self has been destroyed.)

filter_function

a filter function

Returns

a filter identifier that can be used with g_dbus_connection_remove_filter()

pub fn remove_filter(&self, filter_id: FilterId)

Removes a filter.

Note that since filters run in a different thread, there is a race condition where it is possible that the filter will be running even after calling g_dbus_connection_remove_filter(), so you cannot just free data that the filter might be using. Instead, you should pass a #GDestroyNotify to g_dbus_connection_add_filter(), which will be called when it is guaranteed that the data is no longer needed.

filter_id

an identifier obtained from g_dbus_connection_add_filter()

pub fn signal_subscribe<P: Fn(&DBusConnection, &str, &str, &str, &str, &Variant) + 'static>( &self, sender: Option<&str>, interface_name: Option<&str>, member: Option<&str>, object_path: Option<&str>, arg0: Option<&str>, flags: DBusSignalFlags, callback: P, ) -> SignalSubscriptionId

Subscribes to signals on @self and invokes @callback whenever the signal is received. Note that @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.

If @self is not a message bus connection, @sender must be None.

If @sender is a well-known name note that @callback is invoked with the unique name for the owner of @sender, not the well-known name as one would expect. This is because the message bus rewrites the name. As such, to avoid certain race conditions, users should be tracking the name owner of the well-known name and use that when processing the received signal.

If one of DBusSignalFlags::MATCH_ARG0_NAMESPACE or DBusSignalFlags::MATCH_ARG0_PATH are given, @arg0 is interpreted as part of a namespace or path. The first argument of a signal is matched against that part as specified by D-Bus.

If @user_data_free_func is non-None, it will be called (in the thread-default main context of the thread you are calling this method from) at some point after @user_data is no longer needed. (It is not guaranteed to be called synchronously when the signal is unsubscribed from, and may be called after @self has been destroyed.)

As @callback is potentially invoked in a different thread from where it’s emitted, it’s possible for this to happen after g_dbus_connection_signal_unsubscribe() has been called in another thread. Due to this, @user_data should have a strong reference which is freed with @user_data_free_func, rather than pointing to data whose lifecycle is tied to the signal subscription. For example, if a #GObject is used to store the subscription ID from g_dbus_connection_signal_subscribe(), a strong reference to that #GObject must be passed to @user_data, and g_object_unref() passed to @user_data_free_func. You are responsible for breaking the resulting reference count cycle by explicitly unsubscribing from the signal when dropping the last external reference to the #GObject. Alternatively, a weak reference may be used.

It is guaranteed that if you unsubscribe from a signal using g_dbus_connection_signal_unsubscribe() from the same thread which made the corresponding g_dbus_connection_signal_subscribe() call, @callback will not be invoked after g_dbus_connection_signal_unsubscribe() returns.

The returned subscription identifier is an opaque value which is guaranteed to never be zero.

This function can never fail.

sender

sender name to match on (unique or well-known name) or None to listen from all senders

interface_name

D-Bus interface name to match on or None to match on all interfaces

member

D-Bus signal name to match on or None to match on all signals

object_path

object path to match on or None to match on all object paths

arg0

contents of first string argument to match on or None to match on all kinds of arguments

flags

#GDBusSignalFlags describing how arg0 is used in subscribing to the signal

callback

callback to invoke when there is a signal matching the requested data

Returns

a subscription identifier that can be used with g_dbus_connection_signal_unsubscribe()

pub fn signal_unsubscribe(&self, subscription_id: SignalSubscriptionId)

Unsubscribes from signals.

Note that there may still be D-Bus traffic to process (relating to this signal subscription) in the current thread-default #GMainContext after this function has returned. You should continue to iterate the #GMainContext until the #GDestroyNotify function passed to g_dbus_connection_signal_subscribe() is called, in order to avoid memory leaks through callbacks queued on the #GMainContext after it’s stopped being iterated. Alternatively, any idle source with a priority lower than G_PRIORITY_DEFAULT that was scheduled after unsubscription, also indicates that all resources of this subscription are released.

subscription_id

a subscription id obtained from g_dbus_connection_signal_subscribe()

impl DBusConnection

pub fn for_address_sync( address: &str, flags: DBusConnectionFlags, observer: Option<&DBusAuthObserver>, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<DBusConnection, Error>

Synchronously connects and sets up a D-Bus client connection for exchanging D-Bus messages with an endpoint specified by @address which must be in the D-Bus address format.

This constructor can only be used to initiate client-side connections - use g_dbus_connection_new_sync() if you need to act as the server. In particular, @flags cannot contain the DBusConnectionFlags::AUTHENTICATION_SERVER, DBusConnectionFlags::AUTHENTICATION_ALLOW_ANONYMOUS or DBusConnectionFlags::AUTHENTICATION_REQUIRE_SAME_USER flags.

This is a synchronous failable constructor. See g_dbus_connection_new_for_address() for the asynchronous version.

If @observer is not None it may be used to control the authentication process.

address

a D-Bus address

flags

flags describing how to make the connection

observer

a #GDBusAuthObserver or None

cancellable

a #GCancellable or None

Returns

a #GDBusConnection or None if @error is set. Free with g_object_unref().

pub fn new_sync( stream: &impl IsA<IOStream>, guid: Option<&str>, flags: DBusConnectionFlags, observer: Option<&DBusAuthObserver>, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<DBusConnection, Error>

Synchronously sets up a D-Bus connection for exchanging D-Bus messages with the end represented by @stream.

If @stream is a #GSocketConnection, then the corresponding #GSocket will be put into non-blocking mode.

The D-Bus connection will interact with @stream from a worker thread. As a result, the caller should not interact with @stream after this method has been called, except by calling g_object_unref() on it.

If @observer is not None it may be used to control the authentication process.

This is a synchronous failable constructor. See g_dbus_connection_new() for the asynchronous version.

stream

a #GIOStream

guid

the GUID to use if authenticating as a server or None

flags

flags describing how to make the connection

observer

a #GDBusAuthObserver or None

cancellable

a #GCancellable or None

Returns

a #GDBusConnection or None if @error is set. Free with g_object_unref().

pub fn call<P: FnOnce(Result<Variant, Error>) + 'static>( &self, bus_name: Option<&str>, object_path: &str, interface_name: &str, method_name: &str, parameters: Option<&Variant>, reply_type: Option<&VariantTy>, flags: DBusCallFlags, timeout_msec: i32, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Asynchronously invokes the @method_name method on the @interface_name D-Bus interface on the remote object at @object_path owned by @bus_name.

If @self is closed then the operation will fail with IOErrorEnum::Closed. If @cancellable is canceled, the operation will fail with IOErrorEnum::Cancelled. If @parameters contains a value not compatible with the D-Bus protocol, the operation fails with IOErrorEnum::InvalidArgument.

If @reply_type is non-None then the reply will be checked for having this type and an error will be raised if it does not match. Said another way, if you give a @reply_type then any non-None return value will be of this type. Unless it’s G_VARIANT_TYPE_UNIT, the @reply_type will be a tuple containing one or more values.

If the @parameters #GVariant is floating, it is consumed. This allows convenient ‘inline’ use of g_variant_new(), e.g.:

⚠️ The following code is in C ⚠️

 g_dbus_connection_call (connection,
                         "org.freedesktop.StringThings",
                         "/org/freedesktop/StringThings",
                         "org.freedesktop.StringThings",
                         "TwoStrings",
                         g_variant_new ("(ss)",
                                        "Thing One",
                                        "Thing Two"),
                         NULL,
                         G_DBUS_CALL_FLAGS_NONE,
                         -1,
                         NULL,
                         (GAsyncReadyCallback) two_strings_done,
                         NULL);

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_connection_call_finish() to get the result of the operation. See g_dbus_connection_call_sync() for the synchronous version of this function.

If @callback is None then the D-Bus method call message will be sent with the DBusMessageFlags::NO_REPLY_EXPECTED flag set.

bus_name

a unique or well-known bus name or None if @self is not a message bus connection

object_path

path of remote object

interface_name

D-Bus interface to invoke method on

method_name

the name of the method to invoke

parameters

a #GVariant tuple with parameters for the method or None if not passing parameters

reply_type

the expected type of the reply (which will be a tuple), or None

flags

flags from the #GDBusCallFlags enumeration

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

cancellable

a #GCancellable or None

callback

a #GAsyncReadyCallback to call when the request is satisfied or None if you don’t care about the result of the method invocation

pub fn call_future( &self, bus_name: Option<&str>, object_path: &str, interface_name: &str, method_name: &str, parameters: Option<&Variant>, reply_type: Option<&VariantTy>, flags: DBusCallFlags, timeout_msec: i32, ) -> Pin<Box_<dyn Future<Output = Result<Variant, Error>> + 'static>>

pub fn call_sync( &self, bus_name: Option<&str>, object_path: &str, interface_name: &str, method_name: &str, parameters: Option<&Variant>, reply_type: Option<&VariantTy>, flags: DBusCallFlags, timeout_msec: i32, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<Variant, Error>

Synchronously invokes the @method_name method on the @interface_name D-Bus interface on the remote object at @object_path owned by @bus_name.

If @self is closed then the operation will fail with IOErrorEnum::Closed. If @cancellable is canceled, the operation will fail with IOErrorEnum::Cancelled. If @parameters contains a value not compatible with the D-Bus protocol, the operation fails with IOErrorEnum::InvalidArgument.

If @reply_type is non-None then the reply will be checked for having this type and an error will be raised if it does not match. Said another way, if you give a @reply_type then any non-None return value will be of this type.

If the @parameters #GVariant is floating, it is consumed. This allows convenient ‘inline’ use of g_variant_new(), e.g.:

⚠️ The following code is in C ⚠️

 g_dbus_connection_call_sync (connection,
                              "org.freedesktop.StringThings",
                              "/org/freedesktop/StringThings",
                              "org.freedesktop.StringThings",
                              "TwoStrings",
                              g_variant_new ("(ss)",
                                             "Thing One",
                                             "Thing Two"),
                              NULL,
                              G_DBUS_CALL_FLAGS_NONE,
                              -1,
                              NULL,
                              &error);

The calling thread is blocked until a reply is received. See g_dbus_connection_call() for the asynchronous version of this method.

bus_name

a unique or well-known bus name or None if @self is not a message bus connection

object_path

path of remote object

interface_name

D-Bus interface to invoke method on

method_name

the name of the method to invoke

parameters

a #GVariant tuple with parameters for the method or None if not passing parameters

reply_type

the expected type of the reply, or None

flags

flags from the #GDBusCallFlags enumeration

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

cancellable

a #GCancellable or None

Returns

None if @error is set. Otherwise a non-floating #GVariant tuple with return values. Free with g_variant_unref().

pub fn call_with_unix_fd_list<P: FnOnce(Result<(Variant, Option<UnixFDList>), Error>) + 'static>( &self, bus_name: Option<&str>, object_path: &str, interface_name: &str, method_name: &str, parameters: Option<&Variant>, reply_type: Option<&VariantTy>, flags: DBusCallFlags, timeout_msec: i32, fd_list: Option<&impl IsA<UnixFDList>>, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Available on Unix only.

Like g_dbus_connection_call() but also takes a #GUnixFDList object.

The file descriptors normally correspond to G_VARIANT_TYPE_HANDLE values in the body of the message. For example, if a message contains two file descriptors, @fd_list would have length 2, and g_variant_new_handle (0) and g_variant_new_handle (1) would appear somewhere in the body of the message (not necessarily in that order!) to represent the file descriptors at indexes 0 and 1 respectively.

When designing D-Bus APIs that are intended to be interoperable, please note that non-GDBus implementations of D-Bus can usually only access file descriptors if they are referenced in this way by a value of type G_VARIANT_TYPE_HANDLE in the body of the message.

This method is only available on UNIX.

bus_name

a unique or well-known bus name or None if @self is not a message bus connection

object_path

path of remote object

interface_name

D-Bus interface to invoke method on

method_name

the name of the method to invoke

parameters

a #GVariant tuple with parameters for the method or None if not passing parameters

reply_type

the expected type of the reply, or None

flags

flags from the #GDBusCallFlags enumeration

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

fd_list

a #GUnixFDList or None

cancellable

a #GCancellable or None

callback

a #GAsyncReadyCallback to call when the request is satisfied or None if you don’t * care about the result of the method invocation

pub fn call_with_unix_fd_list_future( &self, bus_name: Option<&str>, object_path: &str, interface_name: &str, method_name: &str, parameters: Option<&Variant>, reply_type: Option<&VariantTy>, flags: DBusCallFlags, timeout_msec: i32, fd_list: Option<&(impl IsA<UnixFDList> + Clone + 'static)>, ) -> Pin<Box_<dyn Future<Output = Result<(Variant, Option<UnixFDList>), Error>> + 'static>>

Available on Unix only.

pub fn call_with_unix_fd_list_sync( &self, bus_name: Option<&str>, object_path: &str, interface_name: &str, method_name: &str, parameters: Option<&Variant>, reply_type: Option<&VariantTy>, flags: DBusCallFlags, timeout_msec: i32, fd_list: Option<&impl IsA<UnixFDList>>, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<(Variant, Option<UnixFDList>), Error>

Available on Unix only.

Like g_dbus_connection_call_sync() but also takes and returns #GUnixFDList objects. See g_dbus_connection_call_with_unix_fd_list() and g_dbus_connection_call_with_unix_fd_list_finish() for more details.

This method is only available on UNIX.

bus_name

a unique or well-known bus name or None if @self is not a message bus connection

object_path

path of remote object

interface_name

D-Bus interface to invoke method on

method_name

the name of the method to invoke

parameters

a #GVariant tuple with parameters for the method or None if not passing parameters

reply_type

the expected type of the reply, or None

flags

flags from the #GDBusCallFlags enumeration

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

fd_list

a #GUnixFDList or None

cancellable

a #GCancellable or None

Returns

None if @error is set. Otherwise a non-floating #GVariant tuple with return values. Free with g_variant_unref().

out_fd_list

return location for a #GUnixFDList or None

pub fn close<P: FnOnce(Result<(), Error>) + 'static>( &self, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Closes @self. Note that this never causes the process to exit (this might only happen if the other end of a shared message bus connection disconnects, see #GDBusConnection:exit-on-close).

Once the connection is closed, operations such as sending a message will return with the error IOErrorEnum::Closed. Closing a connection will not automatically flush the connection so queued messages may be lost. Use g_dbus_connection_flush() if you need such guarantees.

If @self is already closed, this method fails with IOErrorEnum::Closed.

When @self has been closed, the #GDBusConnection::closed signal is emitted in the [thread-default main context][g-main-context-push-thread-default] of the thread that @self was constructed in.

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_connection_close_finish() to get the result of the operation. See g_dbus_connection_close_sync() for the synchronous version.

cancellable

a #GCancellable or None

callback

a #GAsyncReadyCallback to call when the request is satisfied or None if you don’t care about the result

pub fn close_future( &self, ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>>

pub fn close_sync( &self, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<(), Error>

Synchronously closes @self. The calling thread is blocked until this is done. See g_dbus_connection_close() for the asynchronous version of this method and more details about what it does.

cancellable

a #GCancellable or None

Returns

true if the operation succeeded, false if @error is set

pub fn emit_signal( &self, destination_bus_name: Option<&str>, object_path: &str, interface_name: &str, signal_name: &str, parameters: Option<&Variant>, ) -> Result<(), Error>

Emits a signal.

If the parameters GVariant is floating, it is consumed.

This can only fail if @parameters is not compatible with the D-Bus protocol (IOErrorEnum::InvalidArgument), or if @self has been closed (IOErrorEnum::Closed).

destination_bus_name

the unique bus name for the destination for the signal or None to emit to all listeners

object_path

path of remote object

interface_name

D-Bus interface to emit a signal on

signal_name

the name of the signal to emit

parameters

a #GVariant tuple with parameters for the signal or None if not passing parameters

Returns

true unless @error is set

pub fn flush<P: FnOnce(Result<(), Error>) + 'static>( &self, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Asynchronously flushes @self, that is, writes all queued outgoing message to the transport and then flushes the transport (using g_output_stream_flush_async()). This is useful in programs that wants to emit a D-Bus signal and then exit immediately. Without flushing the connection, there is no guaranteed that the message has been sent to the networking buffers in the OS kernel.

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_connection_flush_finish() to get the result of the operation. See g_dbus_connection_flush_sync() for the synchronous version.

cancellable

a #GCancellable or None

callback

a #GAsyncReadyCallback to call when the request is satisfied or None if you don’t care about the result

pub fn flush_future( &self, ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>>

pub fn flush_sync( &self, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<(), Error>

Synchronously flushes @self. The calling thread is blocked until this is done. See g_dbus_connection_flush() for the asynchronous version of this method and more details about what it does.

cancellable

a #GCancellable or None

Returns

true if the operation succeeded, false if @error is set

pub fn capabilities(&self) -> DBusCapabilityFlags

Gets the capabilities negotiated with the remote peer

Returns

zero or more flags from the #GDBusCapabilityFlags enumeration

pub fn exits_on_close(&self) -> bool

Gets whether the process is terminated when @self is closed by the remote peer. See #GDBusConnection:exit-on-close for more details.

Returns

whether the process is terminated when @self is closed by the remote peer

pub fn flags(&self) -> DBusConnectionFlags

Available on crate feature v2_60 only.

Gets the flags used to construct this connection

Returns

zero or more flags from the #GDBusConnectionFlags enumeration

pub fn guid(&self) -> GString

The GUID of the peer performing the role of server when authenticating. See #GDBusConnection:guid for more details.

Returns

The GUID. Do not free this string, it is owned by @self.

pub fn last_serial(&self) -> u32

Retrieves the last serial number assigned to a #GDBusMessage on the current thread. This includes messages sent via both low-level API such as g_dbus_connection_send_message() as well as high-level API such as g_dbus_connection_emit_signal(), g_dbus_connection_call() or g_dbus_proxy_call().

Returns

the last used serial or zero when no message has been sent within the current thread

pub fn peer_credentials(&self) -> Option<Credentials>

Gets the credentials of the authenticated peer. This will always return None unless @self acted as a server (e.g. DBusConnectionFlags::AUTHENTICATION_SERVER was passed) when set up and the client passed credentials as part of the authentication process.

In a message bus setup, the message bus is always the server and each application is a client. So this method will always return None for message bus clients.

Returns

a #GCredentials or None if not available. Do not free this object, it is owned by @self.

pub fn stream(&self) -> IOStream

Gets the underlying stream used for IO.

While the #GDBusConnection is active, it will interact with this stream from a worker thread, so it is not safe to interact with the stream directly.

Returns

the stream used for IO

pub fn unique_name(&self) -> Option<GString>

Gets the unique name of @self as assigned by the message bus. This can also be used to figure out if @self is a message bus connection.

Returns

the unique name or None if @self is not a message bus connection. Do not free this string, it is owned by @self.

pub fn is_closed(&self) -> bool

Gets whether @self is closed.

Returns

true if the connection is closed, false otherwise

pub fn send_message( &self, message: &DBusMessage, flags: DBusSendMessageFlags, ) -> Result<u32, Error>

Asynchronously sends @message to the peer represented by @self.

Unless @flags contain the DBusSendMessageFlags::PRESERVE_SERIAL flag, the serial number will be assigned by @self and set on @message via g_dbus_message_set_serial(). If @out_serial is not None, then the serial number used will be written to this location prior to submitting the message to the underlying transport. While it has a volatile qualifier, this is a historical artifact and the argument passed to it should not be volatile.

If @self is closed then the operation will fail with IOErrorEnum::Closed. If @message is not well-formed, the operation fails with IOErrorEnum::InvalidArgument.

See this [server][gdbus-server] and [client][gdbus-unix-fd-client] for an example of how to use this low-level API to send and receive UNIX file descriptors.

Note that @message must be unlocked, unless @flags contain the DBusSendMessageFlags::PRESERVE_SERIAL flag.

message

a #GDBusMessage

flags

flags affecting how the message is sent

Returns

true if the message was well-formed and queued for transmission, false if @error is set

out_serial

return location for serial number assigned to @message when sending it or None

pub fn send_message_with_reply<P: FnOnce(Result<DBusMessage, Error>) + 'static>( &self, message: &DBusMessage, flags: DBusSendMessageFlags, timeout_msec: i32, cancellable: Option<&impl IsA<Cancellable>>, callback: P, ) -> u32

Asynchronously sends @message to the peer represented by @self.

Unless @flags contain the DBusSendMessageFlags::PRESERVE_SERIAL flag, the serial number will be assigned by @self and set on @message via g_dbus_message_set_serial(). If @out_serial is not None, then the serial number used will be written to this location prior to submitting the message to the underlying transport. While it has a volatile qualifier, this is a historical artifact and the argument passed to it should not be volatile.

If @self is closed then the operation will fail with IOErrorEnum::Closed. If @cancellable is canceled, the operation will fail with IOErrorEnum::Cancelled. If @message is not well-formed, the operation fails with IOErrorEnum::InvalidArgument.

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_connection_send_message_with_reply_finish() to get the result of the operation. See g_dbus_connection_send_message_with_reply_sync() for the synchronous version.

Note that @message must be unlocked, unless @flags contain the DBusSendMessageFlags::PRESERVE_SERIAL flag.

See this [server][gdbus-server] and [client][gdbus-unix-fd-client] for an example of how to use this low-level API to send and receive UNIX file descriptors.

message

a #GDBusMessage

flags

flags affecting how the message is sent

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

cancellable

a #GCancellable or None

callback

a #GAsyncReadyCallback to call when the request is satisfied or None if you don’t care about the result

Returns

out_serial

return location for serial number assigned to @message when sending it or None

pub fn send_message_with_reply_future( &self, message: &DBusMessage, flags: DBusSendMessageFlags, timeout_msec: i32, ) -> Pin<Box_<dyn Future<Output = Result<DBusMessage, Error>> + 'static>>

pub fn send_message_with_reply_sync( &self, message: &DBusMessage, flags: DBusSendMessageFlags, timeout_msec: i32, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<(DBusMessage, u32), Error>

Synchronously sends @message to the peer represented by @self and blocks the calling thread until a reply is received or the timeout is reached. See g_dbus_connection_send_message_with_reply() for the asynchronous version of this method.

Unless @flags contain the DBusSendMessageFlags::PRESERVE_SERIAL flag, the serial number will be assigned by @self and set on @message via g_dbus_message_set_serial(). If @out_serial is not None, then the serial number used will be written to this location prior to submitting the message to the underlying transport. While it has a volatile qualifier, this is a historical artifact and the argument passed to it should not be volatile.

If @self is closed then the operation will fail with IOErrorEnum::Closed. If @cancellable is canceled, the operation will fail with IOErrorEnum::Cancelled. If @message is not well-formed, the operation fails with IOErrorEnum::InvalidArgument.

Note that @error is only set if a local in-process error occurred. That is to say that the returned #GDBusMessage object may be of type DBusMessageType::Error. Use g_dbus_message_to_gerror() to transcode this to a #GError.

See this [server][gdbus-server] and [client][gdbus-unix-fd-client] for an example of how to use this low-level API to send and receive UNIX file descriptors.

Note that @message must be unlocked, unless @flags contain the DBusSendMessageFlags::PRESERVE_SERIAL flag.

message

a #GDBusMessage

flags

flags affecting how the message is sent.

timeout_msec

the timeout in milliseconds, -1 to use the default timeout or G_MAXINT for no timeout

cancellable

a #GCancellable or None

Returns

a locked #GDBusMessage that is the reply to @message or None if @error is set

out_serial

return location for serial number assigned to @message when sending it or None

pub fn set_exit_on_close(&self, exit_on_close: bool)

Sets whether the process should be terminated when @self is closed by the remote peer. See #GDBusConnection:exit-on-close for more details.

Note that this function should be used with care. Most modern UNIX desktops tie the notion of a user session with the session bus, and expect all of a user’s applications to quit when their bus connection goes away. If you are setting @exit_on_close to false for the shared session bus connection, you should make sure that your application exits when the user session ends.

exit_on_close

whether the process should be terminated when @self is closed by the remote peer

pub fn start_message_processing(&self)

If @self was created with DBusConnectionFlags::DELAY_MESSAGE_PROCESSING, this method starts processing messages. Does nothing on if @self wasn’t created with this flag or if the method has already been called.

pub fn new<P: FnOnce(Result<DBusConnection, Error>) + 'static>( stream: &impl IsA<IOStream>, guid: Option<&str>, flags: DBusConnectionFlags, observer: Option<&DBusAuthObserver>, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Asynchronously sets up a D-Bus connection for exchanging D-Bus messages with the end represented by @stream.

If @stream is a #GSocketConnection, then the corresponding #GSocket will be put into non-blocking mode.

The D-Bus connection will interact with @stream from a worker thread. As a result, the caller should not interact with @stream after this method has been called, except by calling g_object_unref() on it.

If @observer is not None it may be used to control the authentication process.

When the operation is finished, @callback will be invoked. You can then call g_dbus_connection_new_finish() to get the result of the operation.

This is an asynchronous failable constructor. See g_dbus_connection_new_sync() for the synchronous version.

stream

a #GIOStream

guid

the GUID to use if authenticating as a server or None

flags

flags describing how to make the connection

observer

a #GDBusAuthObserver or None

cancellable

a #GCancellable or None

callback

a #GAsyncReadyCallback to call when the request is satisfied

pub fn new_future( stream: &(impl IsA<IOStream> + Clone + 'static), guid: Option<&str>, flags: DBusConnectionFlags, observer: Option<&DBusAuthObserver>, ) -> Pin<Box_<dyn Future<Output = Result<DBusConnection, Error>> + 'static>>

pub fn for_address<P: FnOnce(Result<DBusConnection, Error>) + 'static>( address: &str, flags: DBusConnectionFlags, observer: Option<&DBusAuthObserver>, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Asynchronously connects and sets up a D-Bus client connection for exchanging D-Bus messages with an endpoint specified by @address which must be in the D-Bus address format.

This constructor can only be used to initiate client-side connections - use g_dbus_connection_new() if you need to act as the server. In particular, @flags cannot contain the DBusConnectionFlags::AUTHENTICATION_SERVER, DBusConnectionFlags::AUTHENTICATION_ALLOW_ANONYMOUS or DBusConnectionFlags::AUTHENTICATION_REQUIRE_SAME_USER flags.

When the operation is finished, @callback will be invoked. You can then call g_dbus_connection_new_for_address_finish() to get the result of the operation.

If @observer is not None it may be used to control the authentication process.

This is an asynchronous failable constructor. See g_dbus_connection_new_for_address_sync() for the synchronous version.

address

a D-Bus address

flags

flags describing how to make the connection

observer

a #GDBusAuthObserver or None

cancellable

a #GCancellable or None

callback

a #GAsyncReadyCallback to call when the request is satisfied

pub fn for_address_future( address: &str, flags: DBusConnectionFlags, observer: Option<&DBusAuthObserver>, ) -> Pin<Box_<dyn Future<Output = Result<DBusConnection, Error>> + 'static>>

pub fn connect_closed<F: Fn(&Self, bool, Option<&Error>) + Send + Sync + 'static>( &self, f: F, ) -> SignalHandlerId

Emitted when the connection is closed.

The cause of this event can be

• If g_dbus_connection_close() is called. In this case @remote_peer_vanished is set to false and @error is None.

• If the remote peer closes the connection. In this case @remote_peer_vanished is set to true and @error is set.

• If the remote peer sends invalid or malformed data. In this case @remote_peer_vanished is set to false and @error is set.

Upon receiving this signal, you should give up your reference to @connection. You are guaranteed that this signal is emitted only once.

remote_peer_vanished

true if @connection is closed because the remote peer closed its end of the connection

error

a #GError with more details about the event or None

pub fn connect_capabilities_notify<F: Fn(&Self) + Send + Sync + 'static>( &self, f: F, ) -> SignalHandlerId

pub fn connect_closed_notify<F: Fn(&Self) + Send + Sync + 'static>( &self, f: F, ) -> SignalHandlerId

pub fn connect_exit_on_close_notify<F: Fn(&Self) + Send + Sync + 'static>( &self, f: F, ) -> SignalHandlerId

pub fn connect_unique_name_notify<F: Fn(&Self) + Send + Sync + 'static>( &self, f: F, ) -> SignalHandlerId

Trait Implementations

impl Clone for DBusConnection

fn clone(&self) -> Self

Makes a clone of this shared reference.

This increments the strong reference count of the object. Dropping the object will decrement it again.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DBusConnection

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl HasParamSpec for DBusConnection

type ParamSpec = ParamSpecObject

type SetValue = DBusConnection

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, DBusConnection>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for DBusConnection

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Hashes the memory address of this object.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for DBusConnection

fn cmp(&self, other: &Self) -> Ordering

Comparison for two GObjects.

Compares the memory addresses of the provided objects.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl ParentClassIs for DBusConnection

type Parent = Object

impl<OT: ObjectType> PartialEq<OT> for DBusConnection

fn eq(&self, other: &OT) -> bool

Equality for two GObjects.

Two GObjects are equal if their memory addresses are equal.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<OT: ObjectType> PartialOrd<OT> for DBusConnection

fn partial_cmp(&self, other: &OT) -> Option<Ordering>

Partial comparison for two GObjects.

Compares the memory addresses of the provided objects.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for DBusConnection

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for DBusConnection

impl IsA<AsyncInitable> for DBusConnection

impl IsA<Initable> for DBusConnection

impl Send for DBusConnection

impl Sync for DBusConnection