wayland: add a generic wayland client

src/wl_usr/usr_object.rs

@@ -0,0 +1,44 @@
+use {
+    crate::{
+        object::{Interface, ObjectId},
+        utils::buffd::MsgParser,
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+#[derive(Debug, Error)]
+pub enum UsrObjectErrorType {
+    #[error("Could not process a `{event}` event")]
+    EventError {
+        event: &'static str,
+        #[source]
+        error: Box<dyn std::error::Error>,
+    },
+    #[error("Unknown event {event}")]
+    UnknownEventError { event: u32 },
+}
+
+#[derive(Debug, Error)]
+#[error("An error occurred in a `{}`", .interface.name())]
+pub struct UsrObjectError {
+    pub interface: Interface,
+    #[source]
+    pub ty: UsrObjectErrorType,
+}
+
+pub trait UsrObjectBase {
+    fn id(&self) -> ObjectId;
+    fn handle_event(
+        self: Rc<Self>,
+        event: u32,
+        parser: MsgParser<'_, '_>,
+    ) -> Result<(), UsrObjectError>;
+    fn interface(&self) -> Interface;
+}
+
+pub trait UsrObject: UsrObjectBase + 'static {
+    fn destroy(&self);
+
+    fn break_loops(&self) {}
+}