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// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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//! Pallet that allows the root to create an offence.
//!
//! NOTE: This pallet should be used for testing purposes.
#![cfg_attr(not(feature = "std"), no_std)]
#[cfg(test)]
mod mock;
#[cfg(test)]
mod tests;
use pallet_session::historical::IdentificationTuple;
use pallet_staking::{BalanceOf, Exposure, ExposureOf, Pallet as Staking};
use sp_runtime::Perbill;
use sp_staking::offence::{DisableStrategy, OnOffenceHandler};
pub use pallet::*;
#[frame_support::pallet]
pub mod pallet {
use super::*;
use frame_support::pallet_prelude::*;
use frame_system::pallet_prelude::*;
#[pallet::config]
pub trait Config:
frame_system::Config
+ pallet_staking::Config
+ pallet_session::Config<ValidatorId = <Self as frame_system::Config>::AccountId>
+ pallet_session::historical::Config<
FullIdentification = Exposure<
<Self as frame_system::Config>::AccountId,
BalanceOf<Self>,
>,
FullIdentificationOf = ExposureOf<Self>,
>
{
type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
}
#[pallet::pallet]
#[pallet::generate_store(pub(super) trait Store)]
pub struct Pallet<T>(_);
#[pallet::event]
#[pallet::generate_deposit(pub(super) fn deposit_event)]
pub enum Event<T: Config> {
/// An offence was created by root.
OffenceCreated { offenders: Vec<(T::AccountId, Perbill)> },
}
#[pallet::error]
pub enum Error<T> {
/// Failed to get the active era from the staking pallet.
FailedToGetActiveEra,
}
type OffenceDetails<T> = sp_staking::offence::OffenceDetails<
<T as frame_system::Config>::AccountId,
IdentificationTuple<T>,
>;
#[pallet::call]
impl<T: Config> Pallet<T> {
/// Allows the `root`, for example sudo to create an offence.
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#[pallet::weight(T::DbWeight::get().reads(2))]
pub fn create_offence(
origin: OriginFor<T>,
offenders: Vec<(T::AccountId, Perbill)>,
) -> DispatchResult {
ensure_root(origin)?;
let slash_fraction =
offenders.clone().into_iter().map(|(_, fraction)| fraction).collect::<Vec<_>>();
let offence_details = Self::get_offence_details(offenders.clone())?;
Self::submit_offence(&offence_details, &slash_fraction);
Self::deposit_event(Event::OffenceCreated { offenders });
Ok(())
}
}
impl<T: Config> Pallet<T> {
/// Returns a vector of offenders that are going to be slashed.
fn get_offence_details(
offenders: Vec<(T::AccountId, Perbill)>,
) -> Result<Vec<OffenceDetails<T>>, DispatchError> {
let now = Staking::<T>::active_era()
.map(|e| e.index)
.ok_or(Error::<T>::FailedToGetActiveEra)?;
Ok(offenders
.clone()
.into_iter()
.map(|(o, _)| OffenceDetails::<T> {
offender: (o.clone(), Staking::<T>::eras_stakers(now, o)),
reporters: vec![],
})
.collect())
}
/// Submits the offence by calling the `on_offence` function.
fn submit_offence(offenders: &[OffenceDetails<T>], slash_fraction: &[Perbill]) {
let session_index = <pallet_session::Pallet<T> as frame_support::traits::ValidatorSet<T::AccountId>>::session_index();
<pallet_staking::Pallet<T> as OnOffenceHandler<
T::AccountId,
IdentificationTuple<T>,
Weight,
>>::on_offence(&offenders, &slash_fraction, session_index, DisableStrategy::WhenSlashed);
}
}
}