pallet_session/historical/
shared.rs

1// This file is part of Substrate.
2
3// Copyright (C) Parity Technologies (UK) Ltd.
4// SPDX-License-Identifier: Apache-2.0
5
6// Licensed under the Apache License, Version 2.0 (the "License");
7// you may not use this file except in compliance with the License.
8// You may obtain a copy of the License at
9//
10// 	http://www.apache.org/licenses/LICENSE-2.0
11//
12// Unless required by applicable law or agreed to in writing, software
13// distributed under the License is distributed on an "AS IS" BASIS,
14// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15// See the License for the specific language governing permissions and
16// limitations under the License.
17
18//! Shared logic between on-chain and off-chain components used for slashing using an off-chain
19//! worker.
20
21use alloc::{borrow::ToOwned, vec::Vec};
22use codec::Encode;
23use sp_staking::SessionIndex;
24
25pub(super) const PREFIX: &[u8] = b"session_historical";
26pub(super) const LAST_PRUNE: &[u8] = b"session_historical_last_prune";
27
28/// Derive the key used to store the list of validators
29pub(super) fn derive_key<P: AsRef<[u8]>>(prefix: P, session_index: SessionIndex) -> Vec<u8> {
30	session_index.using_encoded(|encoded_session_index| {
31		let mut key = prefix.as_ref().to_owned();
32		key.push(b'/');
33		key.extend_from_slice(encoded_session_index);
34		key
35	})
36}
pallet_session/historical/shared.rs

pallet_session/historical/
shared.rs
