feat: handle axum errors with anyhow

Cargo.lock

@@ -82,9 +82,9 @@ checksum = "1bec1de6f59aedf83baf9ff929c98f2ad654b97c9510f4e70cf6f661d49fd5b1"
 
 [[package]]
 name = "anyhow"
-version = "1.0.86"
+version = "1.0.89"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3d1d046238990b9cf5bcde22a3fb3584ee5cf65fb2765f454ed428c7a0063da"
+checksum = "86fdf8605db99b54d3cd748a44c6d04df638eb5dafb219b135d0149bd0db01f6"
 
 [[package]]
 name = "async-broadcast"
@@ -334,6 +334,7 @@ dependencies = [
 name = "backend"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "axum",
  "cargo-watch",
  "listenfd",

crates/backend/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+anyhow = "1.0.89"
 axum = "0.7.6"
 listenfd = "1.0.1"
 tokio = { version = "1.40.0", features = ["macros", "rt-multi-thread"] }

crates/backend/src/lib.rs

@@ -1,4 +1,6 @@
+use anyhow::Error as AnyError;
 use axum::http::{StatusCode, Uri};
+use axum::response::{IntoResponse, Response};
 use axum::{routing::get, Router};
 
 pub fn get_router() -> Router {
@@ -10,3 +12,26 @@ pub fn get_router() -> Router {
 async fn fallback(uri: Uri) -> (StatusCode, String) {
     (StatusCode::NOT_FOUND, format!("No route for {uri}"))
 }
+
+struct AppError(AnyError);
+
+// To automatically convert `AppError` into a response
+impl IntoResponse for AppError {
+    fn into_response(self) -> Response {
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            format!("Internal Server Error: {}", self.0),
+        )
+            .into_response()
+    }
+}
+
+// To automatically convert `AnyError` into `AppError`
+impl<E> From<E> for AppError
+where
+    E: Into<AnyError>,
+{
+    fn from(err: E) -> Self {
+        Self(err.into())
+    }
+}