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rework staking::reap_stash (#10178)

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* rework reap_stash

* Update frame/staking/src/pallet/mod.rs

Co-authored-by: Zeke Mostov <z.mostov@gmail.com>

* Update frame/staking/src/pallet/mod.rs

Co-authored-by: Zeke Mostov <z.mostov@gmail.com>

* Update frame/staking/src/pallet/mod.rs

Co-authored-by: Zeke Mostov <z.mostov@gmail.com>

* Fix

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Zeke Mostov <z.mostov@gmail.com>
This commit is contained in:
Kian Paimani
2021-11-14 15:04:20 +00:00
committed by GitHub
parent b769c754be
commit 4920ce5a61
3 changed files with 50 additions and 113 deletions
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substrate/frame/staking/src/pallet/mod.rs
+22 -18
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@@ -1425,33 +1425,37 @@ pub mod pallet {
Ok(())
}
/// Remove all data structure concerning a staker/stash once its balance is at the minimum.
/// This is essentially equivalent to `withdraw_unbonded` except it can be called by anyone
/// and the target `stash` must have no funds left beyond the ED.
/// Remove all data structures concerning a staker/stash once it is at a state where it can
/// be considered `dust` in the staking system. The requirements are:
///
/// This can be called from any origin.
/// 1. the `total_balance` of the stash is below existential deposit.
/// 2. or, the `ledger.total` of the stash is below existential deposit.
///
/// - `stash`: The stash account to reap. Its balance must be zero.
/// The former can happen in cases like a slash; the latter when a fully unbonded account
/// is still receiving staking rewards in `RewardDestination::Staked`.
///
/// # <weight>
/// Complexity: O(S) where S is the number of slashing spans on the account.
/// DB Weight:
/// - Reads: Stash Account, Bonded, Slashing Spans, Locks
/// - Writes: Bonded, Slashing Spans (if S > 0), Ledger, Payee, Validators, Nominators,
/// Stash Account, Locks
/// - Writes Each: SpanSlash * S
/// # </weight>
/// It can be called by anyone, as long as `stash` meets the above requirements.
///
/// Refunds the transaction fees upon successful execution.
#[pallet::weight(T::WeightInfo::reap_stash(*num_slashing_spans))]
pub fn reap_stash(
_origin: OriginFor<T>,
origin: OriginFor<T>,
stash: T::AccountId,
num_slashing_spans: u32,
) -> DispatchResult {
let at_minimum = T::Currency::total_balance(&stash) == T::Currency::minimum_balance();
ensure!(at_minimum, Error::<T>::FundedTarget);
) -> DispatchResultWithPostInfo {
let _ = ensure_signed(origin)?;
let ed = T::Currency::minimum_balance();
let reapable = T::Currency::total_balance(&stash) < ed ||
Self::ledger(Self::bonded(stash.clone()).ok_or(Error::<T>::NotStash)?)
.map(|l| l.total)
.unwrap_or_default() < ed;
ensure!(reapable, Error::<T>::FundedTarget);
Self::kill_stash(&stash, num_slashing_spans)?;
T::Currency::remove_lock(STAKING_ID, &stash);
Ok(())
Ok(Pays::No.into())
}
/// Remove the given nominations from the calling validator.