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fungible::Unbalanced::decrease_balance: Handle precision properly (#2823)

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This commit is contained in:
Bastian Köcher
2024-01-05 19:55:32 +01:00
committed by GitHub
parent 19de1c9660
commit 1c95310a66
3 changed files with 46 additions and 3 deletions
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substrate/frame/support/src/traits/tokens/fungible/regular.rs
+9 -2
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@@ -181,9 +181,16 @@ pub trait Unbalanced<AccountId>: Inspect<AccountId> {
) -> Result<Self::Balance, DispatchError> {
let old_balance = Self::balance(who);
let free = Self::reducible_balance(who, preservation, force);
if let BestEffort = precision {
amount = amount.min(free);
match precision {
BestEffort => {
amount = amount.min(free);
},
Exact =>
if free < amount {
return Err(TokenError::FundsUnavailable.into())
},
}
let new_balance = old_balance.checked_sub(&amount).ok_or(TokenError::FundsUnavailable)?;
if let Some(dust) = Self::write_balance(who, new_balance)? {
Self::handle_dust(Dust(dust));