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prep council election pallet for being dissolved (#11790)

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* prep council election pallet for being dissolved + make it temporarily bounded

* fix tests

* fix

* Update frame/elections-phragmen/src/lib.rs

* fix bench?
This commit is contained in:
Kian Paimani
2022-07-12 18:08:54 +01:00
committed by GitHub
parent 1902dc169d
commit 4b8d784210
4 changed files with 66 additions and 151 deletions
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substrate/frame/elections-phragmen/src/lib.rs
+54 -75
View File
@@ -100,7 +100,6 @@
use codec::{Decode, Encode};
use frame_support::{
dispatch::WithPostDispatchInfo,
traits::{
defensive_prelude::*, ChangeMembers, Contains, ContainsLengthBound, Currency,
CurrencyToVote, Get, InitializeMembers, LockIdentifier, LockableCurrency, OnUnbalanced,
@@ -126,6 +125,17 @@ pub mod migrations;
/// The maximum votes allowed per voter.
pub const MAXIMUM_VOTE: usize = 16;
// Some safe temp values to make the wasm execution sane while we still use this pallet.
#[cfg(test)]
pub(crate) const MAX_CANDIDATES: u32 = 100;
#[cfg(not(test))]
pub(crate) const MAX_CANDIDATES: u32 = 1000;
#[cfg(test)]
pub(crate) const MAX_VOTERS: u32 = 1000;
#[cfg(not(test))]
pub(crate) const MAX_VOTERS: u32 = 10 * 1000;
type BalanceOf<T> =
<<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;
type NegativeImbalanceOf<T> = <<T as Config>::Currency as Currency<
@@ -385,8 +395,9 @@ pub mod pallet {
) -> DispatchResultWithPostInfo {
let who = ensure_signed(origin)?;
let actual_count = <Candidates<T>>::decode_len().unwrap_or(0);
ensure!(actual_count as u32 <= candidate_count, Error::<T>::InvalidWitnessData);
let actual_count = <Candidates<T>>::decode_len().unwrap_or(0) as u32;
ensure!(actual_count <= candidate_count, Error::<T>::InvalidWitnessData);
ensure!(actual_count <= MAX_CANDIDATES, Error::<T>::TooManyCandidates);
let index = Self::is_candidate(&who).err().ok_or(Error::<T>::DuplicatedCandidate)?;
@@ -469,7 +480,11 @@ pub mod pallet {
/// the outgoing member is slashed.
///
/// If a runner-up is available, then the best runner-up will be removed and replaces the
/// outgoing member. Otherwise, a new phragmen election is started.
/// outgoing member. Otherwise, if `rerun_election` is `true`, a new phragmen election is
/// started, else, nothing happens.
///
/// If `slash_bond` is set to true, the bond of the member being removed is slashed. Else,
/// it is returned.
///
/// The dispatch origin of this call must be root.
///
@@ -479,33 +494,24 @@ pub mod pallet {
/// If we have a replacement, we use a small weight. Else, since this is a root call and
/// will go into phragmen, we assume full block for now.
/// # </weight>
#[pallet::weight(if *has_replacement {
T::WeightInfo::remove_member_with_replacement()
} else {
#[pallet::weight(if *rerun_election {
T::WeightInfo::remove_member_without_replacement()
} else {
T::WeightInfo::remove_member_with_replacement()
})]
pub fn remove_member(
origin: OriginFor<T>,
who: <T::Lookup as StaticLookup>::Source,
has_replacement: bool,
slash_bond: bool,
rerun_election: bool,
) -> DispatchResultWithPostInfo {
ensure_root(origin)?;
let who = T::Lookup::lookup(who)?;
let will_have_replacement = <RunnersUp<T>>::decode_len().map_or(false, |l| l > 0);
if will_have_replacement != has_replacement {
// In both cases, we will change more weight than need. Refund and abort.
return Err(Error::<T>::InvalidReplacement.with_weight(
// refund. The weight value comes from a benchmark which is special to this.
T::WeightInfo::remove_member_wrong_refund(),
))
}
let had_replacement = Self::remove_and_replace_member(&who, true)?;
debug_assert_eq!(has_replacement, had_replacement);
let _ = Self::remove_and_replace_member(&who, slash_bond)?;
Self::deposit_event(Event::MemberKicked { member: who });
if !had_replacement {
if rerun_election {
Self::do_phragmen();
}
@@ -585,10 +591,10 @@ pub mod pallet {
UnableToPayBond,
/// Must be a voter.
MustBeVoter,
/// Cannot report self.
ReportSelf,
/// Duplicated candidate submission.
DuplicatedCandidate,
/// Too many candidates have been created.
TooManyCandidates,
/// Member cannot re-submit candidacy.
MemberSubmit,
/// Runner cannot re-submit candidacy.
@@ -893,7 +899,7 @@ impl<T: Config> Pallet<T> {
if candidates_and_deposit.len().is_zero() {
Self::deposit_event(Event::EmptyTerm);
return T::DbWeight::get().reads(5)
return T::DbWeight::get().reads(3)
}
// All of the new winners that come out of phragmen will thus have a deposit recorded.
@@ -906,10 +912,28 @@ impl<T: Config> Pallet<T> {
let to_balance = |e: ExtendedBalance| T::CurrencyToVote::to_currency(e, total_issuance);
let mut num_edges: u32 = 0;
// used for prime election.
let voters_and_stakes = Voting::<T>::iter()
.map(|(voter, Voter { stake, votes, .. })| (voter, stake, votes))
.collect::<Vec<_>>();
let mut voters_and_stakes = Vec::new();
match Voting::<T>::iter().try_for_each(|(voter, Voter { stake, votes, .. })| {
if voters_and_stakes.len() < MAX_VOTERS as usize {
voters_and_stakes.push((voter, stake, votes));
Ok(())
} else {
Err(())
}
}) {
Ok(_) => (),
Err(_) => {
log::error!(
target: "runtime::elections-phragmen",
"Failed to run election. Number of voters exceeded",
);
Self::deposit_event(Event::ElectionError);
return T::DbWeight::get().reads(3 + MAX_VOTERS as u64)
},
}
// used for phragmen.
let voters_and_votes = voters_and_stakes
.iter()
@@ -1137,7 +1161,7 @@ mod tests {
use sp_runtime::{
testing::Header,
traits::{BlakeTwo256, IdentityLookup},
BuildStorage, ModuleError,
BuildStorage,
};
use substrate_test_utils::assert_eq_uvec;
@@ -1321,6 +1345,7 @@ mod tests {
self
}
pub fn build_and_execute(self, test: impl FnOnce() -> ()) {
sp_tracing::try_init_simple();
MEMBERS.with(|m| {
*m.borrow_mut() =
self.genesis_members.iter().map(|(m, _)| m.clone()).collect::<Vec<_>>()
@@ -2494,7 +2519,7 @@ mod tests {
assert_ok!(submit_candidacy(Origin::signed(3)));
assert_ok!(vote(Origin::signed(3), vec![3], 30));
assert_ok!(Elections::remove_member(Origin::root(), 4, false));
assert_ok!(Elections::remove_member(Origin::root(), 4, true, true));
assert_eq!(balances(&4), (35, 2)); // slashed
assert_eq!(Elections::election_rounds(), 2); // new election round
@@ -2502,52 +2527,6 @@ mod tests {
});
}
#[test]
fn remove_member_should_indicate_replacement() {
ExtBuilder::default().build_and_execute(|| {
assert_ok!(submit_candidacy(Origin::signed(5)));
assert_ok!(submit_candidacy(Origin::signed(4)));
assert_ok!(vote(Origin::signed(4), vec![4], 40));
assert_ok!(vote(Origin::signed(5), vec![5], 50));
System::set_block_number(5);
Elections::on_initialize(System::block_number());
assert_eq!(members_ids(), vec![4, 5]);
// no replacement yet.
let unwrapped_error = Elections::remove_member(Origin::root(), 4, true).unwrap_err();
assert!(matches!(
unwrapped_error.error,
DispatchError::Module(ModuleError { message: Some("InvalidReplacement"), .. })
));
assert!(unwrapped_error.post_info.actual_weight.is_some());
});
ExtBuilder::default().desired_runners_up(1).build_and_execute(|| {
assert_ok!(submit_candidacy(Origin::signed(5)));
assert_ok!(submit_candidacy(Origin::signed(4)));
assert_ok!(submit_candidacy(Origin::signed(3)));
assert_ok!(vote(Origin::signed(3), vec![3], 30));
assert_ok!(vote(Origin::signed(4), vec![4], 40));
assert_ok!(vote(Origin::signed(5), vec![5], 50));
System::set_block_number(5);
Elections::on_initialize(System::block_number());
assert_eq!(members_ids(), vec![4, 5]);
assert_eq!(runners_up_ids(), vec![3]);
// there is a replacement! and this one needs a weight refund.
let unwrapped_error = Elections::remove_member(Origin::root(), 4, false).unwrap_err();
assert!(matches!(
unwrapped_error.error,
DispatchError::Module(ModuleError { message: Some("InvalidReplacement"), .. })
));
assert!(unwrapped_error.post_info.actual_weight.is_some());
});
}
#[test]
fn seats_should_be_released_when_no_vote() {
ExtBuilder::default().build_and_execute(|| {
@@ -2684,7 +2663,7 @@ mod tests {
Elections::on_initialize(System::block_number());
assert_eq!(members_ids(), vec![2, 4]);
assert_ok!(Elections::remove_member(Origin::root(), 2, true));
assert_ok!(Elections::remove_member(Origin::root(), 2, true, false));
assert_eq!(members_ids(), vec![4, 5]);
});
}