cancel approval flow on frontend when request is abandoned by client

src-tauri/src/errors.rs

@@ -83,15 +83,33 @@ where
 }
 
 
+struct SerializeUpstream<E>(pub E);
+
+impl<E: Error> Serialize for SerializeUpstream<E> {
+    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        let msg = format!("{}", self.0);
+        let mut map = serializer.serialize_map(None)?;
+        map.serialize_entry("msg", &msg)?;
+        map.serialize_entry("code", &None::<&str>)?;
+        map.serialize_entry("source", &None::<&str>)?;
+        map.end()
+    }
+}
+
 fn serialize_upstream_err<E, M>(err: &E, map: &mut M) -> Result<(), M::Error> 
 where
     E: Error,
     M: serde::ser::SerializeMap,
 {
-    let msg = err.source().map(|s| format!("{s}"));
-    map.serialize_entry("msg", &msg)?;
-    map.serialize_entry("code", &None::<&str>)?;
-    map.serialize_entry("source", &None::<&str>)?;
+    // let msg = err.source().map(|s| format!("{s}"));
+    // map.serialize_entry("msg", &msg)?;
+    // map.serialize_entry("code", &None::<&str>)?;
+    // map.serialize_entry("source", &None::<&str>)?;
+
+    match err.source() {
+        Some(src) => map.serialize_entry("source", &SerializeUpstream(src))?,
+        None => map.serialize_entry("source", &None::<&str>)?,
+    }
 
     Ok(())
 }
@@ -153,7 +171,7 @@ pub enum SendResponseError {
 }
 
 
-// errors encountered while handling an HTTP request
+// errors encountered while handling a client request
 #[derive(Debug, ThisError, AsRefStr)]
 pub enum HandlerError {
     #[error("Error writing to stream: {0}")]
@@ -164,6 +182,8 @@ pub enum HandlerError {
     BadRequest(#[from] serde_json::Error),
     #[error("HTTP request too large")]
     RequestTooLarge,
+    #[error("Connection closed early by client")]
+    Abandoned,
     #[error("Internal server error")]
     Internal(#[from] RecvError),
     #[error("Error accessing credentials: {0}")]
@@ -345,7 +365,6 @@ impl Serialize for SerializeWrapper<&GetSessionTokenError> {
 }
 
 
-
 impl_serialize_basic!(SetupError);
 impl_serialize_basic!(GetCredentialsError);
 impl_serialize_basic!(ClientInfoError);