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// Copyright (C) Moondance Labs Ltd.
// This file is part of Tanssi.
// Tanssi is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Tanssi is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Tanssi. If not, see <http://www.gnu.org/licenses/>
//! Invulnerables pallet.
//!
//! A pallet to manage invulnerable collators in a parachain.
//! ## Terminology
//! - Collator: A parachain block producer.
//! - Invulnerable: An account appointed by governance and guaranteed to be in the collator set.
#![cfg_attr(not(feature = "std"), no_std)]
pub use pallet::*;
use {
core::marker::PhantomData,
sp_runtime::{traits::Convert, TokenError},
};
#[cfg(test)]
mod mock;
mod tests;
#[cfg(feature = "runtime-benchmarks")]
mod benchmarking;
pub mod weights;
#[frame_support::pallet]
pub mod pallet {
pub use crate::weights::WeightInfo;
use frame_support::traits::Currency;
frame_support::{
dispatch::DispatchResultWithPostInfo,
pallet_prelude::*,
traits::{EnsureOrigin, ValidatorRegistration},
BoundedVec, DefaultNoBound,
},
frame_system::pallet_prelude::*,
pallet_session::SessionManager,
sp_runtime::traits::Convert,
sp_staking::SessionIndex,
sp_std::vec::Vec,
/// The current storage version.
const STORAGE_VERSION: StorageVersion = StorageVersion::new(0);
/// Configure the pallet by specifying the parameters and types on which it depends.
#[pallet::config]
pub trait Config: frame_system::Config {
/// Overarching event type.
type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
/// Origin that can dictate updating parameters of this pallet.
type UpdateOrigin: EnsureOrigin<Self::RuntimeOrigin>;
/// Maximum number of invulnerables.
#[pallet::constant]
type MaxInvulnerables: Get<u32>;
/// A stable ID for a collator.
type CollatorId: Member + Parameter + MaybeSerializeDeserialize + MaxEncodedLen + Ord;
/// A conversion from account ID to collator ID.
///
/// Its cost must be at most one storage read.
type CollatorIdOf: Convert<Self::AccountId, Option<Self::CollatorId>>;
/// Validate a user is registered
type CollatorRegistration: ValidatorRegistration<Self::CollatorId>;
/// The weight information of this pallet.
type WeightInfo: WeightInfo;
type Currency: Currency<Self::AccountId>
+ frame_support::traits::fungible::Balanced<Self::AccountId>;
}
#[pallet::pallet]
#[pallet::storage_version(STORAGE_VERSION)]
pub struct Pallet<T>(_);
/// The invulnerable, permissioned collators.
#[pallet::storage]
pub type Invulnerables<T: Config> =
StorageValue<_, BoundedVec<T::CollatorId, T::MaxInvulnerables>, ValueQuery>;
#[pallet::genesis_config]
#[derive(DefaultNoBound)]
pub struct GenesisConfig<T: Config> {
pub invulnerables: Vec<T::CollatorId>,
#[pallet::genesis_build]
impl<T: Config> BuildGenesisConfig for GenesisConfig<T> {
fn build(&self) {
let duplicate_invulnerables = self
.invulnerables
.iter()
.collect::<sp_std::collections::btree_set::BTreeSet<_>>();
assert!(
duplicate_invulnerables.len() == self.invulnerables.len(),
"duplicate invulnerables in genesis."
);
let bounded_invulnerables =
BoundedVec::<_, T::MaxInvulnerables>::try_from(self.invulnerables.clone())
.expect("genesis invulnerables are more than T::MaxInvulnerables");
<Invulnerables<T>>::put(bounded_invulnerables);
#[pallet::event]
#[pallet::generate_deposit(pub(super) fn deposit_event)]
pub enum Event<T: Config> {
/// A new Invulnerable was added.
InvulnerableAdded { account_id: T::AccountId },
/// An Invulnerable was removed.
InvulnerableRemoved { account_id: T::AccountId },
#[pallet::error]
pub enum Error<T> {
/// There are too many Invulnerables.
TooManyInvulnerables,
/// Account is already an Invulnerable.
AlreadyInvulnerable,
/// Account is not an Invulnerable.
NotInvulnerable,
/// Account does not have keys registered
NoKeysRegistered,
/// Unable to derive collator id from account id
UnableToDeriveCollatorId,
#[pallet::call]
impl<T: Config> Pallet<T> {
/// Add a new account `who` to the list of `Invulnerables` collators.
/// The origin for this call must be the `UpdateOrigin`.
#[pallet::call_index(1)]
#[pallet::weight(T::WeightInfo::add_invulnerable(
T::MaxInvulnerables::get().saturating_sub(1),
))]
pub fn add_invulnerable(
origin: OriginFor<T>,
who: T::AccountId,
) -> DispatchResultWithPostInfo {
T::UpdateOrigin::ensure_origin(origin)?;
// don't let one unprepared collator ruin things for everyone.
let maybe_collator_id = T::CollatorIdOf::convert(who.clone())
.filter(T::CollatorRegistration::is_registered);
let collator_id = maybe_collator_id.ok_or(Error::<T>::NoKeysRegistered)?;
<Invulnerables<T>>::try_mutate(|invulnerables| -> DispatchResult {
if invulnerables.contains(&collator_id) {
Err(Error::<T>::AlreadyInvulnerable)?;
invulnerables
.try_push(collator_id.clone())
.map_err(|_| Error::<T>::TooManyInvulnerables)?;
Ok(())
})?;
Self::deposit_event(Event::InvulnerableAdded { account_id: who });
let weight_used = T::WeightInfo::add_invulnerable(
Invulnerables::<T>::decode_len()
.unwrap_or_default()
.try_into()
.unwrap_or(T::MaxInvulnerables::get().saturating_sub(1)),
Ok(Some(weight_used).into())
/// Remove an account `who` from the list of `Invulnerables` collators.
#[pallet::call_index(2)]
#[pallet::weight(T::WeightInfo::remove_invulnerable(T::MaxInvulnerables::get()))]
pub fn remove_invulnerable(origin: OriginFor<T>, who: T::AccountId) -> DispatchResult {
let collator_id = T::CollatorIdOf::convert(who.clone())
.ok_or(Error::<T>::UnableToDeriveCollatorId)?;
let pos = invulnerables
.position(|x| x == &collator_id)
.ok_or(Error::<T>::NotInvulnerable)?;
invulnerables.remove(pos);
Self::deposit_event(Event::InvulnerableRemoved { account_id: who });
pub fn invulnerables() -> BoundedVec<T::CollatorId, T::MaxInvulnerables> {
Invulnerables::<T>::get()
/// Play the role of the session manager.
impl<T: Config> SessionManager<T::CollatorId> for Pallet<T> {
fn new_session(index: SessionIndex) -> Option<Vec<T::CollatorId>> {
log::info!(
"assembling new invulnerable collators for new session {} at #{:?}",
index,
<frame_system::Pallet<T>>::block_number(),
let invulnerables = Self::invulnerables().to_vec();
frame_system::Pallet::<T>::register_extra_weight_unchecked(
T::WeightInfo::new_session(invulnerables.len() as u32),
DispatchClass::Mandatory,
Some(invulnerables)
fn start_session(_: SessionIndex) {
// we don't care.
fn end_session(_: SessionIndex) {
/// If the rewarded account is an Invulnerable, distribute the entire reward
/// amount to them. Otherwise use the `Fallback` distribution.
pub struct InvulnerableRewardDistribution<Runtime, Currency, Fallback>(
PhantomData<(Runtime, Currency, Fallback)>,
use {frame_support::pallet_prelude::Weight, sp_runtime::traits::Get};
type CreditOf<Runtime, Currency> =
frame_support::traits::fungible::Credit<<Runtime as frame_system::Config>::AccountId, Currency>;
pub type AccountIdOf<T> = <T as frame_system::Config>::AccountId;
impl<Runtime, Currency, Fallback>
tp_traits::DistributeRewards<AccountIdOf<Runtime>, CreditOf<Runtime, Currency>>
for InvulnerableRewardDistribution<Runtime, Currency, Fallback>
where
Runtime: frame_system::Config + Config,
Fallback: tp_traits::DistributeRewards<AccountIdOf<Runtime>, CreditOf<Runtime, Currency>>,
Currency: frame_support::traits::fungible::Balanced<AccountIdOf<Runtime>>,
{
fn distribute_rewards(
rewarded: AccountIdOf<Runtime>,
amount: CreditOf<Runtime, Currency>,
) -> frame_support::pallet_prelude::DispatchResultWithPostInfo {
let mut total_weight = Weight::zero();
let collator_id = Runtime::CollatorIdOf::convert(rewarded.clone())
.ok_or(Error::<Runtime>::UnableToDeriveCollatorId)?;
// weight to read invulnerables
total_weight += Runtime::DbWeight::get().reads(1);
if !Invulnerables::<Runtime>::get().contains(&collator_id) {
let post_info = Fallback::distribute_rewards(rewarded, amount)?;
if let Some(weight) = post_info.actual_weight {
total_weight += weight;
} else {
Currency::resolve(&rewarded, amount).map_err(|_| TokenError::NotExpendable)?;
total_weight +=
Runtime::WeightInfo::reward_invulnerable(Runtime::MaxInvulnerables::get())
Ok(Some(total_weight).into())