Use Result

src/domain.rs

@@ -11,7 +11,7 @@ impl SubscriberName {
     /// Returns an instance of `SubscriberName` if the input satisfies all
     /// our validation constraints on subscriber names.  
     /// It panics otherwise.
-    pub fn parse(s: String) -> SubscriberName {
+    pub fn parse(s: String) -> Result<SubscriberName, String> {
         // `.trim()` returns a view over the input `s` without trailing
         // whitespace-like characters.
         // `.is_empty` checks if the view contains any character.
@@ -38,7 +38,7 @@ impl SubscriberName {
         if is_empty_or_whitespace || is_too_long || contains_forbidden_characters {
             panic!(format!("{} is not a valid subscriber name.", s))
         } else {
-            Self(s)
+            Ok(Self(s))
         }
     }
 }

src/routes/subscriptions.rs

@@ -24,7 +24,7 @@ pub async fn subscribe(
 ) -> Result<HttpResponse, HttpResponse> {
     let new_subscriber = NewSubscriber {
         email: form.0.email,
-        name: SubscriberName::parse(form.0.name),
+        name: SubscriberName::parse(form.0.name).expect("Name validation failed."),
     };
     insert_subscriber(&pool, &new_subscriber)
         .await