Fungibles and Non-Fungibles Create and Destroy Traits + Assets and Uniques Implementation (#9844)

* refactor `do_destroy` * destroy trait * refactor do_force_create * impl create trait * do not bleed weight into api * Do the same for uniques * add docs
2026-06-14 01:41:09 +00:00 · 2021-09-26 18:05:01 -04:00
parent 0daa2b66ec
commit f8a228859e
8 changed files with 243 additions and 88 deletions
@@ -478,4 +478,88 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		Self::deposit_event(Event::Transferred(id, source.clone(), dest.clone(), credit));
 		Ok(credit)
 	}
+
+	/// Create a new asset without taking a deposit.
+	///
+	/// * `id`: The `AssetId` you want the new asset to have. Must not already be in use.
+	/// * `owner`: The owner, issuer, admin, and freezer of this asset upon creation.
+	/// * `is_sufficient`: Whether this asset needs users to have an existential deposit to hold
+	///   this asset.
+	/// * `min_balance`: The minimum balance a user is allowed to have of this asset before they are
+	///   considered dust and cleaned up.
+	pub(super) fn do_force_create(
+		id: T::AssetId,
+		owner: T::AccountId,
+		is_sufficient: bool,
+		min_balance: T::Balance,
+	) -> DispatchResult {
+		ensure!(!Asset::<T, I>::contains_key(id), Error::<T, I>::InUse);
+		ensure!(!min_balance.is_zero(), Error::<T, I>::MinBalanceZero);
+
+		Asset::<T, I>::insert(
+			id,
+			AssetDetails {
+				owner: owner.clone(),
+				issuer: owner.clone(),
+				admin: owner.clone(),
+				freezer: owner.clone(),
+				supply: Zero::zero(),
+				deposit: Zero::zero(),
+				min_balance,
+				is_sufficient,
+				accounts: 0,
+				sufficients: 0,
+				approvals: 0,
+				is_frozen: false,
+			},
+		);
+		Self::deposit_event(Event::ForceCreated(id, owner));
+		Ok(())
+	}
+
+	/// Destroy an existing asset.
+	///
+	/// * `id`: The asset you want to destroy.
+	/// * `witness`: Witness data needed about the current state of the asset, used to confirm
+	///   complexity of the operation.
+	/// * `maybe_check_owner`: An optional check before destroying the asset, if the provided
+	///   account is the owner of that asset. Can be used for authorization checks.
+	pub(super) fn do_destroy(
+		id: T::AssetId,
+		witness: DestroyWitness,
+		maybe_check_owner: Option<T::AccountId>,
+	) -> Result<DestroyWitness, DispatchError> {
+		Asset::<T, I>::try_mutate_exists(id, |maybe_details| {
+			let mut details = maybe_details.take().ok_or(Error::<T, I>::Unknown)?;
+			if let Some(check_owner) = maybe_check_owner {
+				ensure!(details.owner == check_owner, Error::<T, I>::NoPermission);
+			}
+			ensure!(details.accounts <= witness.accounts, Error::<T, I>::BadWitness);
+			ensure!(details.sufficients <= witness.sufficients, Error::<T, I>::BadWitness);
+			ensure!(details.approvals <= witness.approvals, Error::<T, I>::BadWitness);
+
+			for (who, v) in Account::<T, I>::drain_prefix(id) {
+				Self::dead_account(id, &who, &mut details, v.sufficient);
+			}
+			debug_assert_eq!(details.accounts, 0);
+			debug_assert_eq!(details.sufficients, 0);
+
+			let metadata = Metadata::<T, I>::take(&id);
+			T::Currency::unreserve(
+				&details.owner,
+				details.deposit.saturating_add(metadata.deposit),
+			);
+
+			for ((owner, _), approval) in Approvals::<T, I>::drain_prefix((&id,)) {
+				T::Currency::unreserve(&owner, approval.deposit);
+			}
+			Self::deposit_event(Event::Destroyed(id));
+
+			Ok(DestroyWitness {
+				accounts: details.accounts,
+				sufficients: details.sufficients,
+				approvals: details.approvals,
+			})
+		})
+	}
 }