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
// 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.
//! On-chain logic to store a validator-set for deferred validation using an off-chain worker.
use alloc::vec::Vec;
use codec::Encode;
use sp_runtime::traits::Convert;
use super::{shared, Config as HistoricalConfig};
use crate::{Config as SessionConfig, Pallet as SessionModule, SessionIndex};
/// Store the validator-set associated to the `session_index` to the off-chain database.
///
/// Further processing is then done [`off-chain side`](super::offchain).
///
/// **Must** be called from on-chain, i.e. a call that originates from
/// `on_initialize(..)` or `on_finalization(..)`.
/// **Must** be called during the session, which validator-set is to be stored for further
/// off-chain processing. Otherwise the `FullIdentification` might not be available.
pub fn store_session_validator_set_to_offchain<T: HistoricalConfig + SessionConfig>(
session_index: SessionIndex,
) {
let encoded_validator_list = <SessionModule<T>>::validators()
.into_iter()
.filter_map(|validator_id: <T as SessionConfig>::ValidatorId| {
let full_identification =
<<T as HistoricalConfig>::FullIdentificationOf>::convert(validator_id.clone());
full_identification.map(|full_identification| (validator_id, full_identification))
})
.collect::<Vec<_>>();
encoded_validator_list.using_encoded(|encoded_validator_list| {
let derived_key = shared::derive_key(shared::PREFIX, session_index);
sp_io::offchain_index::set(derived_key.as_slice(), encoded_validator_list);
});
}
/// Store the validator set associated to the _current_ session index to the off-chain database.
///
/// See [`store_session_validator_set_to_offchain`]
/// for further information and restrictions.
pub fn store_current_session_validator_set_to_offchain<T: HistoricalConfig + SessionConfig>() {
store_session_validator_set_to_offchain::<T>(<SessionModule<T>>::current_index());
}