referrerpolicy=no-referrer-when-downgrade
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134

// This file is part of Substrate.

// 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.

//! # Root Offences Pallet
//! 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;

extern crate alloc;

use alloc::vec::Vec;
use pallet_session::historical::IdentificationTuple;
use pallet_staking::{BalanceOf, Exposure, ExposureOf, Pallet as Staking};
use sp_runtime::Perbill;
use sp_staking::offence::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]
	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.
		#[pallet::call_index(0)]
		#[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 = pallet_staking::ActiveEra::<T>::get()
				.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: Default::default(),
				})
				.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);
		}
	}
}