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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/>
//! # Authority Mapping Pallet
//!
//! This pallet stores the AuthorityId -> AccountID mapping for two sessions
//! In particular it holds the mapping for the current and the past session
//! Both are necessary to verify block-authorship with respect to current
//! block proposals or blocks that have been proposed in the past-session
#![cfg_attr(not(feature = "std"), no_std)]
pub use pallet::*;
use {
frame_support::pallet_prelude::*,
sp_runtime::{
traits::{AtLeast32BitUnsigned, CheckedSub},
RuntimeAppPublic,
},
sp_std::{collections::btree_map::BTreeMap, vec},
};
#[cfg(test)]
mod mock;
mod tests;
#[frame_support::pallet]
pub mod pallet {
use super::*;
#[pallet::pallet]
#[pallet::without_storage_info]
pub struct Pallet<T>(_);
/// Configure the pallet by specifying the parameters and types on which it depends.
#[pallet::config]
pub trait Config: frame_system::Config {
type SessionIndex: parity_scale_codec::FullCodec + TypeInfo + Copy + AtLeast32BitUnsigned;
// Sessions after which keys should be removed
#[pallet::constant]
type SessionRemovalBoundary: Get<Self::SessionIndex>;
type AuthorityId: Member
+ Parameter
+ Ord
+ RuntimeAppPublic
+ MaybeSerializeDeserialize
+ MaxEncodedLen;
}
#[pallet::storage]
#[pallet::getter(fn authority_id_mapping)]
pub type AuthorityIdMapping<T: Config> = StorageMap<
_,
Twox64Concat,
T::SessionIndex,
BTreeMap<T::AuthorityId, T::AccountId>,
OptionQuery,
>;
impl<T: Config> Pallet<T> {
pub fn initializer_on_new_session(
session_index: &T::SessionIndex,
authorities: &[(T::AccountId, T::AuthorityId)],
) {
// Remove only if the checked sub does not saturate
if let Some(session_index_to_remove) =
session_index.checked_sub(&T::SessionRemovalBoundary::get())
{
AuthorityIdMapping::<T>::remove(session_index_to_remove)
let assignation: BTreeMap<T::AuthorityId, T::AccountId> =
authorities.iter().cloned().map(|(a, b)| (b, a)).collect();
AuthorityIdMapping::<T>::insert(session_index, assignation);