Resolve Credit to Account impls of OnUnbalanced trait

substrate/frame/support/src/traits/tokens/imbalance.rs

@@ -25,7 +25,7 @@ use sp_std::ops::Div;
 mod on_unbalanced;
 mod signed_imbalance;
 mod split_two_ways;
-pub use on_unbalanced::OnUnbalanced;
+pub use on_unbalanced::{OnUnbalanced, ResolveAssetTo, ResolveTo};
 pub use signed_imbalance::SignedImbalance;
 pub use split_two_ways::SplitTwoWays;
 

substrate/frame/support/src/traits/tokens/imbalance/on_unbalanced.rs

@@ -17,7 +17,9 @@
 
 //! Trait for handling imbalances.
 
-use crate::traits::misc::TryDrop;
+use frame_support::traits::{fungible, fungibles, misc::TryDrop};
+use sp_core::TypedGet;
+use sp_std::marker::PhantomData;
 
 /// Handler for when some currency "account" decreased in balance for
 /// some reason.
@@ -53,3 +55,29 @@ pub trait OnUnbalanced<Imbalance: TryDrop> {
 }
 
 impl<Imbalance: TryDrop> OnUnbalanced<Imbalance> for () {}
+
+/// Resolves received asset credit to account `A`, implementing [`OnUnbalanced`].
+///
+/// Credits that cannot be resolved to account `A` are dropped. This may occur if the account for
+/// address `A` does not exist and the existential deposit requirement is not met.
+pub struct ResolveTo<A, F>(PhantomData<(A, F)>);
+impl<A: TypedGet, F: fungible::Balanced<A::Type>> OnUnbalanced<fungible::Credit<A::Type, F>>
+	for ResolveTo<A, F>
+{
+	fn on_nonzero_unbalanced(credit: fungible::Credit<A::Type, F>) {
+		let _ = F::resolve(&A::get(), credit).map_err(|c| drop(c));
+	}
+}
+
+/// Resolves received asset credit to account `A`, implementing [`OnUnbalanced`].
+///
+/// Credits that cannot be resolved to account `A` are dropped. This may occur if the account for
+/// address `A` does not exist and the existential deposit requirement is not met.
+pub struct ResolveAssetTo<A, F>(PhantomData<(A, F)>);
+impl<A: TypedGet, F: fungibles::Balanced<A::Type>> OnUnbalanced<fungibles::Credit<A::Type, F>>
+	for ResolveAssetTo<A, F>
+{
+	fn on_nonzero_unbalanced(credit: fungibles::Credit<A::Type, F>) {
+		let _ = F::resolve(&A::get(), credit).map_err(|c| drop(c));
+	}
+}