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Sr treasury fix (#739)

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* treasury: use 'mutate' and 'retain' to avoid creating a new vec

* treasury: check the underflow case
This commit is contained in:
Guanqun Lu
2018-09-14 15:50:22 +08:00
committed by Gav Wood
parent de4db765f5
commit b76660afd4
1 changed files with 22 additions and 21 deletions
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substrate/srml/treasury/src/lib.rs
+6 -5
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@@ -109,7 +109,7 @@ decl_storage! {
/// proposal gets these back. A rejected proposal doesn't. /// proposal gets these back. A rejected proposal doesn't.
ProposalBond get(proposal_bond): required Permill; ProposalBond get(proposal_bond): required Permill;
/// Minimum amount of funds that should be placed ina deposit for making a proposal. /// Minimum amount of funds that should be placed in a deposit for making a proposal.
ProposalBondMinimum get(proposal_bond_minimum): required T::Balance; ProposalBondMinimum get(proposal_bond_minimum): required T::Balance;
/// Period between successive spends. /// Period between successive spends.
@@ -227,7 +227,8 @@ impl<T: Trait> Module<T> {
Self::deposit_event(RawEvent::Spending(budget_remaining)); Self::deposit_event(RawEvent::Spending(budget_remaining));
let mut missed_any = false; let mut missed_any = false;
let remaining_approvals: Vec<_> = <Approvals<T>>::get().into_iter().filter(|&index| { <Approvals<T>>::mutate(|v| {
v.retain(|&index| {
// Should always be true, but shouldn't panic if false or we're screwed. // Should always be true, but shouldn't panic if false or we're screwed.
if let Some(p) = Self::proposals(index) { if let Some(p) = Self::proposals(index) {
if p.value <= budget_remaining { if p.value <= budget_remaining {
@@ -249,12 +250,12 @@ impl<T: Trait> Module<T> {
} else { } else {
false false
} }
}).collect(); });
<Approvals<T>>::put(remaining_approvals); });
if !missed_any { if !missed_any {
// burn some proportion of the remaining budget if we run a surplus. // burn some proportion of the remaining budget if we run a surplus.
let burn = Self::burn().times(budget_remaining); let burn = Self::burn().times(budget_remaining).min(budget_remaining);
budget_remaining -= burn; budget_remaining -= burn;
Self::deposit_event(RawEvent::Burnt(burn)) Self::deposit_event(RawEvent::Burnt(burn))
} }