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Resolve Credit to Account impls of OnUnbalanced trait (#1876)

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Implements the `OnUnbalanced` trait to resolve received credits to the
specified account. Credits that fail to resolve are dropped.

### Motivation 
Throughout the codebase, several types implement the trait with the same
behavior. While some currently utilize older currency trait, a migration
to the new fungible/s is anticipated for all. Examples:
[1](https://github.com/paritytech/polkadot-sdk/blob/1b34571c0c423115813034783ddf524aac257bf5/cumulus/parachains/common/src/impls.rs#L37),
[2](https://github.com/paritytech/polkadot-sdk/blob/1b34571c0c423115813034783ddf524aac257bf5/polkadot/runtime/common/src/impls.rs#L36),
[3](https://github.com/paritytech/polkadot-sdk/blob/1b34571c0c423115813034783ddf524aac257bf5/substrate/bin/node/runtime/src/impls.rs#L40),
[4](https://github.com/paritytech/polkadot-sdk/blob/1b34571c0c423115813034783ddf524aac257bf5/substrate/bin/node/runtime/src/lib.rs#L1969),
[5](https://github.com/paritytech/polkadot-sdk/blob/1b34571c0c423115813034783ddf524aac257bf5/substrate/frame/broker/src/mock.rs#L198),
[6](https://github.com/paritytech/polkadot-sdk/blob/1b34571c0c423115813034783ddf524aac257bf5/substrate/frame/society/src/lib.rs#L2031),
[7](https://github.com/paritytech/polkadot-sdk/blob/1b34571c0c423115813034783ddf524aac257bf5/substrate/frame/treasury/src/lib.rs#L1118)
This commit is contained in:
Muharem
2023-10-23 19:14:52 +02:00
committed by GitHub
parent 676bacd729
commit d0fd266003
2 changed files with 30 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/frame/support/src/traits/tokens/imbalance.rs
+1 -1
View File
@@ -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
+29 -1
View File
@@ -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));
}
}