Add error catchers

src/catchers.rs

@@ -0,0 +1,23 @@
+//! The application error catchers
+
+use rocket::catch;
+use rocket_contrib::json;
+use rocket_contrib::json::JsonValue;
+
+/// Catches an HTTP 404 (Not Found) error.
+#[catch(404)]
+pub fn not_found() -> JsonValue {
+    json!({
+        "status": "error",
+        "reason": "Resource was not found",
+    })
+}
+
+/// Catches an HTTP 422 (Unprocessable Entity) error.
+#[catch(422)]
+pub fn unprocessable_entity() -> JsonValue {
+    json!({
+        "status": "error",
+        "reason": "Could not parse JSON body or fields were missing",
+    })
+}

src/main.rs

@@ -4,9 +4,10 @@
 #[macro_use]
 extern crate diesel;
 
-use rocket::{routes, Rocket};
+use rocket::{catchers, routes, Rocket};
 use rocket_contrib::serve::StaticFiles;
 
+pub mod catchers;
 pub mod handlers;
 
 fn rocket() -> Rocket {
@@ -52,6 +53,10 @@ fn rocket() -> Rocket {
                 handlers::timeline::destroy,
             ],
         )
+        .register(catchers![
+            catchers::not_found,
+            catchers::unprocessable_entity
+        ])
 }
 
 fn main() {