ei: add support for libei

src/ei/ei_ifs/ei_pingpong.rs

@@ -0,0 +1,45 @@
+use {
+    crate::{
+        ei::{
+            ei_client::{EiClient, EiClientError},
+            ei_object::{EiObject, EiVersion},
+        },
+        leaks::Tracker,
+        wire_ei::{
+            ei_pingpong::{Done, EiPingpongRequestHandler},
+            EiPingpongId,
+        },
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+#[allow(dead_code)]
+pub struct EiPingpong {
+    pub id: EiPingpongId,
+    pub client: Rc<EiClient>,
+    pub tracker: Tracker<Self>,
+    pub version: EiVersion,
+}
+
+impl EiPingpongRequestHandler for EiPingpong {
+    type Error = EiPingpongError;
+
+    fn done(&self, _req: Done, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+ei_object_base! {
+    self = EiPingpong;
+    version = self.version;
+}
+
+impl EiObject for EiPingpong {}
+
+#[derive(Debug, Error)]
+pub enum EiPingpongError {
+    #[error(transparent)]
+    EiClientError(Box<EiClientError>),
+}
+efrom!(EiPingpongError, EiClientError);