✨ zb,zm: Support SignalEmitter<'_> in property getters

zbus/src/fdo/properties.rs

@@ -32,6 +32,7 @@ impl Properties {
         #[zbus(connection)] conn: &Connection,
         #[zbus(object_server)] server: &ObjectServer,
         #[zbus(header)] header: Header<'_>,
+        #[zbus(signal_emitter)] emitter: SignalEmitter<'_>,
     ) -> Result<OwnedValue> {
         let path = header.path().ok_or(crate::Error::MissingField)?;
         let root = server.root().read().await;
@@ -46,7 +47,7 @@ impl Properties {
             .instance
             .read()
             .await
-            .get(property_name, server, conn, Some(&header))
+            .get(property_name, server, conn, Some(&header), &emitter)
             .await;
         res.unwrap_or_else(|| {
             Err(Error::UnknownProperty(format!(
@@ -121,6 +122,7 @@ impl Properties {
         #[zbus(object_server)] server: &ObjectServer,
         #[zbus(connection)] connection: &Connection,
         #[zbus(header)] header: Header<'_>,
+        #[zbus(signal_emitter)] emitter: SignalEmitter<'_>,
     ) -> Result<HashMap<String, OwnedValue>> {
         let path = header.path().ok_or(crate::Error::MissingField)?;
         let root = server.root().read().await;
@@ -135,7 +137,7 @@ impl Properties {
             .instance
             .read()
             .await
-            .get_all(server, connection, Some(&header))
+            .get_all(server, connection, Some(&header), &emitter)
             .await?;
         Ok(res)
     }

zbus/src/object_server/interface/mod.rs

@@ -59,6 +59,7 @@ pub trait Interface: Any + Send + Sync {
         server: &ObjectServer,
         connection: &Connection,
         header: Option<&message::Header<'_>>,
+        emitter: &SignalEmitter<'_>,
     ) -> Option<fdo::Result<OwnedValue>>;
 
     /// Return all the properties.
@@ -67,6 +68,7 @@ pub trait Interface: Any + Send + Sync {
         object_server: &ObjectServer,
         connection: &Connection,
         header: Option<&message::Header<'_>>,
+        emitter: &SignalEmitter<'_>,
     ) -> fdo::Result<HashMap<String, OwnedValue>>;
 
     /// Set a property value.

zbus/src/object_server/mod.rs

@@ -166,7 +166,7 @@ impl ObjectServer {
                 let emitter = SignalEmitter::new(&self.connection(), manager_path.clone())?;
                 let mut interfaces = HashMap::new();
                 let owned_props = node
-                    .get_properties(self, &self.connection(), name.clone())
+                    .get_properties(self, &self.connection(), &emitter, name.clone())
                     .await?;
                 let props = owned_props
                     .iter()

zbus/src/object_server/node.rs

@@ -10,6 +10,7 @@ use zvariant::{ObjectPath, OwnedObjectPath, OwnedValue};
 
 use crate::{
     fdo::{self, Introspectable, ManagedObjects, ObjectManager, Peer, Properties},
+    object_server::SignalEmitter,
     Connection, ObjectServer,
 };
 
@@ -229,8 +230,9 @@ impl Node {
                     && *n != &Properties::name()
                     && *n != &ObjectManager::name()
             }) {
+                let emitter = SignalEmitter::new(connection, node.path.clone())?;
                 let props = node
-                    .get_properties(object_server, connection, iface_name.clone())
+                    .get_properties(object_server, connection, &emitter, iface_name.clone())
                     .await?;
                 interfaces.insert(iface_name.clone().into(), props);
             }
@@ -245,14 +247,15 @@ impl Node {
         &self,
         object_server: &ObjectServer,
         connection: &Connection,
+        emitter: &SignalEmitter<'_>,
         interface_name: InterfaceName<'_>,
     ) -> fdo::Result<HashMap<String, OwnedValue>> {
         self.interface_lock(interface_name)
             .expect("Interface was added but not found")
             .instance
             .read()
             .await
-            .get_all(object_server, connection, None)
+            .get_all(object_server, connection, None, emitter)
             .await
     }
 }

zbus/tests/e2e.rs

@@ -269,10 +269,11 @@ impl MyIface {
         #[zbus(header)] header: Option<Header<'_>>,
         #[zbus(connection)] connection: &Connection,
         #[zbus(object_server)] object_server: &ObjectServer,
+        #[zbus(signal_emitter)] emitter: SignalEmitter<'_>,
     ) -> bool {
         debug!(
-            "`TestHeaderProp` getter called, header: {:?}, connection: {:?}, object_server: {:?}",
-            header, connection, object_server
+            "`TestHeaderProp` getter called, header: {:?}, connection: {:?}, object_server: {:?}, emitter: {:?}",
+            header, connection, object_server, emitter
         );
         header.is_some()
     }

zbus_macros/src/iface.rs

@@ -880,6 +880,7 @@ pub fn expand(args: Punctuated<Meta, Token![,]>, mut input: ItemImpl) -> syn::Re
                 object_server: &#zbus::ObjectServer,
                 connection: &#zbus::Connection,
                 header: Option<&#zbus::message::Header<'_>>,
+                signal_emitter: &#zbus::object_server::SignalEmitter<'_>,
             ) -> ::std::option::Option<#zbus::fdo::Result<#zbus::zvariant::OwnedValue>> {
                 match property_name {
                     #get_dispatch
@@ -892,6 +893,7 @@ pub fn expand(args: Punctuated<Meta, Token![,]>, mut input: ItemImpl) -> syn::Re
                 object_server: &#zbus::ObjectServer,
                 connection: &#zbus::Connection,
                 header: Option<&#zbus::message::Header<'_>>,
+                signal_emitter: &#zbus::object_server::SignalEmitter<'_>,
             ) -> #zbus::fdo::Result<::std::collections::HashMap<
                 ::std::string::String,
                 #zbus::zvariant::OwnedValue,
@@ -1051,37 +1053,38 @@ fn get_args_from_inputs(
 
                 let signal_context_arg = &input.pat;
 
-                signal_emitter_arg_decl = Some(quote! {
-                    let #signal_context_arg = match hdr.path() {
-                        ::std::option::Option::Some(p) => {
-                            #zbus::object_server::SignalEmitter::new(connection, p).expect("Infallible conversion failed")
-                        }
-                        ::std::option::Option::None => {
-                            let err = #zbus::fdo::Error::UnknownObject("Path Required".into());
-                            return connection.reply_dbus_error(&hdr, err).await;
-                        }
-                    };
-                });
+                signal_emitter_arg_decl = match method_type {
+                    MethodType::Property(PropertyType::Getter) => {
+                        Some(quote! { let #signal_context_arg = signal_emitter.clone(); })
+                    }
+                    _ => Some(quote! {
+                        let #signal_context_arg = match hdr.path() {
+                            ::std::option::Option::Some(p) => {
+                                #zbus::object_server::SignalEmitter::new(connection, p).expect("Infallible conversion failed")
+                            }
+                            ::std::option::Option::None => {
+                                let err = #zbus::fdo::Error::UnknownObject("Path Required".into());
+                                return connection.reply_dbus_error(&hdr, err).await;
+                            }
+                        };
+                    }),
+                };
             } else {
                 args_names.push(pat_ident(input).unwrap());
                 tys.push(&input.ty);
             }
         }
 
-        let (hdr_init, msg_init, signal_emitter_arg_decl, args_decl) = match method_type {
-            MethodType::Property(PropertyType::Getter) => {
-                (quote! {}, quote! {}, quote! {}, quote! {})
-            }
+        let (hdr_init, msg_init, args_decl) = match method_type {
+            MethodType::Property(PropertyType::Getter) => (quote! {}, quote! {}, quote! {}),
             MethodType::Property(PropertyType::Setter) => (
                 quote! { let hdr = header.as_ref().unwrap(); },
                 quote! {},
-                quote! { #signal_emitter_arg_decl },
                 quote! {},
             ),
             _ => (
                 quote! { let hdr = message.header(); },
                 quote! { let msg_body = message.body(); },
-                quote! { #signal_emitter_arg_decl },
                 quote! {
                     let (#(#args_names),*): (#(#tys),*) =
                         match msg_body.deserialize() {

zbus_macros/src/lib.rs

@@ -300,8 +300,7 @@ pub fn proxy(attr: TokenStream, item: TokenStream) -> TokenStream {
 ///   which will be set to `None` if the method is called for reasons other than to respond to an
 ///   external property access.
 /// * `signal_emitter` - This marks the method argument to receive a [`SignalEmitter`] instance,
-///   which is needed for emitting signals the easy way. This argument is not available for property
-///   getters.
+///   which is needed for emitting signals the easy way.
 ///
 /// # Example
 ///