Use associated type instead of eyre for error message

[iamsauravsharma]

Use thiserror instead of eyre so error can be handled by library user. https://docs.rs/eyre/latest/eyre/#comparison-to-thiserror for more information Use trait type instead of using eyre for error message

[epilys]

This is useful because I also hit this problem when I was writing some stuff with axum-login

[maxcountryman]

What about allowing the user to supply their own error type via the trait directly? Something like this:

diff --git a/axum-login/src/user_store.rs b/axum-login/src/user_store.rs
index 4ea9f1d..4bf6e6c 100644
--- a/axum-login/src/user_store.rs
+++ b/axum-login/src/user_store.rs
@@ -1,6 +1,6 @@
 use async_trait::async_trait;

-use crate::{AuthUser, Result};
+use crate::AuthUser;

 /// A trait which defines a method that allows retrieval of users from an
 /// arbitrary backend.
@@ -12,6 +12,9 @@ where
     /// An associated user type which will be loaded from the store.
     type User: AuthUser<UserId, Role>;

+    /// An associated error type.
+    type Error: std::error::Error;
+
     /// Load and return a user.
     ///
     /// This provides a generic interface for loading a user from some store.
@@ -19,5 +22,8 @@ where
     /// unique, stable identifier of the user is available. See [`AuthUser`]
     /// for expected minimal interface of the user type itself.
     #[must_use]
-    async fn load_user(&self, user_id: &UserId) -> Result<Option<Self::User>>;
+    async fn load_user(
+        &self,
+        user_id: &UserId,
+    ) -> std::result::Result<Option<Self::User>, Self::Error>;
 }

[iamsauravsharma]

I have added support for associated type Error without using both thiserror and eyre

[maxcountryman]

Thanks. Do you mind also updating the change log?

[iamsauravsharma]

I have added changelog under unreleased header for PR