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Use can_hold instead of can_reserve in fn hold #12004

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Use can_hold instead of can_reserve in fn hold #12004

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408ede3
Use can_hold instead of can_reserve in fn hold
KiChjang Aug 10, 2022
462a9de
Add tests for fungible::hold
KiChjang Sep 27, 2022
8be79c2
Merge remote-tracking branch 'origin/master' into kckyeung/fix-fungib…
KiChjang Sep 27, 2022
13d2261
cargo fmt
KiChjang Sep 27, 2022
7a6db84
Add keep_alive parameter to can_hold
KiChjang Oct 7, 2022
f41bd2a
Merge remote-tracking branch 'origin/master' into kckyeung/fix-fungib…
KiChjang Nov 15, 2022
3730f24
Merge remote-tracking branch 'origin/master' into kckyeung/fix-fungib…
Nov 29, 2022
9420645
Revert "Add keep_alive parameter to can_hold"
ruseinov Nov 29, 2022
17e226b
Make sure `ReservableCurrency::can_reserve` takes `ExistentialDeposit…
ruseinov Nov 29, 2022
5153396
Enforce within .
ruseinov Nov 29, 2022
b41b36b
fix reserve
ruseinov Nov 29, 2022
7916a0a
fix tests
ruseinov Dec 1, 2022
b58674d
fix bench
ruseinov Dec 1, 2022
84e648c
fix assets tests
ruseinov Dec 1, 2022
8b50397
fix asset bench
ruseinov Dec 1, 2022
37ab667
add a clarification
ruseinov Dec 1, 2022
6b7da31
fix benches
ruseinov Dec 2, 2022
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15 changes: 9 additions & 6 deletions frame/balances/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1182,12 +1182,15 @@ impl<T: Config<I>, I: 'static> fungible::MutateHold<T::AccountId> for Pallet<T,
if amount.is_zero() {
return Ok(())
}
ensure!(Self::can_reserve(who, amount), Error::<T, I>::InsufficientBalance);
Self::mutate_account(who, |a| {
a.free -= amount;
a.reserved += amount;
})?;
Ok(())
ensure!(
<Self as fungible::InspectHold<T::AccountId>>::can_hold(who, amount),
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@KiChjang KiChjang Sep 27, 2022 •
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Okay, after writing unit tests, I found out that there is a difference between can_reserve and can_hold: the latter ensures that the reserved/held amount doesn't make the free balance go below the existential deposit. Should we still continue using can_hold here then? Or should we change can_hold to match the semantics of can_reserve?

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if we change can_hold what that mess up any existing code using can_hold / what are the tradeoffs?

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We want people to be able to use fungible traits instead of Currency in the future. See #8285 and #8453. We currently use Currency traits everywhere, and we'd like to change that.

Error::<T, I>::InsufficientBalance,
);
Self::try_mutate_account(who, |a, _| -> DispatchResult {
a.free = a.free.checked_sub(&amount).ok_or(Error::<T, I>::InsufficientBalance)?;
a.reserved = a.reserved.checked_add(&amount).ok_or(ArithmeticError::Overflow)?;
Ok(())
})
}
fn release(
who: &T::AccountId,
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