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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/>
//! # Initializer Pallet
//!
//! This pallet is in charge of organizing what happens on session changes.
//! In particular this pallet has implemented the OneSessionHandler trait
//! which will be called upon a session change. There it will call the
//! SessionHandler config trait
#![cfg_attr(not(feature = "std"), no_std)]
#[cfg(test)]
mod mock;
mod tests;
pub use pallet::*;
use {
frame_support::{pallet_prelude::*, traits::OneSessionHandler},
scale_info::TypeInfo,
sp_runtime::{traits::AtLeast32BitUnsigned, RuntimeAppPublic},
sp_std::prelude::*,
};
#[frame_support::pallet]
pub mod pallet {
use super::*;
// The apply_new_session trait. We need to comply with this
pub trait ApplyNewSession<T: Config> {
fn apply_new_session(
changed: bool,
session_index: T::SessionIndex,
all_validators: Vec<(T::AccountId, T::AuthorityId)>,
queued: Vec<(T::AccountId, T::AuthorityId)>,
);
fn on_before_session_ending();
}
#[pallet::pallet]
pub struct Pallet<T>(_);
#[pallet::config]
pub trait Config: frame_system::Config {
type SessionIndex: parity_scale_codec::FullCodec + TypeInfo + Copy + AtLeast32BitUnsigned;
/// The identifier type for an authority.
type AuthorityId: Member
+ Parameter
+ RuntimeAppPublic
+ MaybeSerializeDeserialize
+ MaxEncodedLen;
type SessionHandler: ApplyNewSession<Self>;
impl<T: Config> Pallet<T> {
/// Should be called when a new session occurs. If `queued` is `None`,
/// the `validators` are considered queued.
fn on_new_session<'a, I>(
validators: I,
queued: Option<I>,
) where
I: Iterator<Item = (&'a T::AccountId, T::AuthorityId)> + 'a,
{
let validators: Vec<_> = validators.map(|(k, v)| (k.clone(), v)).collect();
let queued: Vec<_> = if let Some(queued) = queued {
queued.map(|(k, v)| (k.clone(), v)).collect()
} else {
validators.clone()
T::SessionHandler::apply_new_session(changed, session_index, validators, queued);
/// Should be called when a new session occurs. Buffers the session notification to be applied
/// at the end of the block. If `queued` is `None`, the `validators` are considered queued.
fn on_genesis_session<'a, I>(validators: I)
where
<Pallet<T>>::on_new_session(false, 0u32.into(), validators, None);
// Allow to trigger `on_new_session` in tests, this is needed as long as `pallet_session` is not
// implemented in mock.
pub(crate) fn test_trigger_on_new_session<'a, I>(
Self::on_new_session(changed, session_index, validators, queued)
impl<T: Config> sp_runtime::BoundToRuntimeAppPublic for Pallet<T> {
type Public = T::AuthorityId;
impl<T: pallet_session::Config + Config> OneSessionHandler<T::AccountId> for Pallet<T> {
type Key = T::AuthorityId;
I: Iterator<Item = (&'a T::AccountId, Self::Key)> + 'a,
<Pallet<T>>::on_genesis_session(validators);
fn on_new_session<'a, I>(changed: bool, validators: I, queued: I)
let session_index = <pallet_session::Pallet<T>>::current_index();
<Pallet<T>>::on_new_session(changed, session_index.into(), validators, Some(queued));
fn on_disabled(_i: u32) {}
fn on_before_session_ending() {
<T as Config>::SessionHandler::on_before_session_ending();