Replace bool by Result<(), dispatchError> for checks

closes #90 (closed)

pallets/duniter-wot/src/lib.rs

@@ -92,6 +92,18 @@ pub mod pallet {
             true
         }
     }
+
+    // ERRORS //
+
+    #[pallet::error]
+    pub enum Error<T, I = ()> {
+        /// Identity creation period not respected
+        IdtyCreationPeriodNotRespected,
+        /// Not enough received certifications to create identity
+        NotEnoughReceivedCertsToCreateIdty,
+        /// Max number of emited certs reached
+        MaxEmitedCertsReached,
+    }
 }
 
 impl<AccountId, T: Config<I>, I: 'static> pallet_identity::traits::EnsureIdtyCallAllowed<T>
@@ -99,26 +111,43 @@ impl<AccountId, T: Config<I>, I: 'static> pallet_identity::traits::EnsureIdtyCal
 where
     T: frame_system::Config<AccountId = AccountId> + pallet_membership::Config<I>,
 {
-    fn can_create_identity(creator: IdtyIndex) -> bool {
+    fn check_create_identity(creator: IdtyIndex) -> Result<(), DispatchError> {
         if !T::IsSubWot::get() {
             let cert_meta = pallet_certification::Pallet::<T, I>::idty_cert_meta(creator);
-            cert_meta.received_count >= T::MinCertForCreateIdtyRight::get()
-                && cert_meta.next_issuable_on <= frame_system::pallet::Pallet::<T>::block_number()
-                && cert_meta.issued_count < T::MaxByIssuer::get()
+
+            // perform all checks
+            ensure!(
+                cert_meta.received_count >= T::MinCertForCreateIdtyRight::get(),
+                Error::<T, I>::NotEnoughReceivedCertsToCreateIdty
+            );
+            ensure!(
+                cert_meta.issued_count < T::MaxByIssuer::get(),
+                Error::<T, I>::MaxEmitedCertsReached
+            );
+            ensure!(
+                cert_meta.next_issuable_on <= frame_system::pallet::Pallet::<T>::block_number(),
+                Error::<T, I>::IdtyCreationPeriodNotRespected
+            );
+
+            // all checks passed
+            Ok(())
         } else {
-            true
+            // sub wot can always create identity (why?)
+            Ok(())
         }
     }
-    fn can_confirm_identity(idty_index: IdtyIndex) -> bool {
+    fn check_confirm_identity(idty_index: IdtyIndex) -> Result<(), DispatchError> {
         if !T::IsSubWot::get() {
-            pallet_membership::Pallet::<T, I>::force_request_membership(
+            match pallet_membership::Pallet::<T, I>::force_request_membership(
                 RawOrigin::Root.into(),
                 idty_index,
                 Default::default(),
-            )
-            .is_ok()
+            ) {
+                Ok(_) => Ok(()),
+                Err(e) => Err(e.error), // return error from inner function
+            }
         } else {
-            true
+            Ok(())
         }
     }
     fn can_validate_identity(idty_index: IdtyIndex) -> bool {