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historical slashing w ocw w adhoc tree creation (#6220)

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* draft

* steps

* chore: fmt

* step by step

* more details

* make test public

* refactor: split into on and offchain

* test stab

* tabs my friend

* offchain overlay: split key into prefix and true key

Simplifies inspection and makes key actually unique.

* test: share state

* fix & test

* docs improv

* address review comments

* cleanup test chore

* refactor, abbrev link text

* chore: linewidth

* fix prefix key split fallout

* minor fallout

* minor changes

* addresses review comments

* rename historical.rs -> historical/mod.rs

* avoid shared::* wildcard import

* fix: add missing call to store_session_validator_set_to_offchain

* fix/compile: missing shared:: prefix

* fix/test: flow

* fix/review: Apply suggestions from code review

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* fix/review: more review comment fixes

* fix/review: make ValidatorSet private

* fix/include: core -> sp_core

* fix/review: fallout

* fix/visbility: make them public API

Ref #6358

* fix/review: review changes fallout - again

Co-authored-by: Bernhard Schuster <bernhard@parity.io>
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
This commit is contained in:
Bernhard Schuster
2020-06-16 13:14:49 +02:00
committed by GitHub
parent 622dff9ca7
commit 3f30f69b5b
9 changed files with 496 additions and 39 deletions
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substrate/frame/session/src/historical/shared.rs
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// This file is part of Substrate.
// Copyright (C) 2019-2020 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.
//! Shared logic between on-chain and off-chain components used for slashing using an off-chain
//! worker.
use super::SessionIndex;
use sp_std::prelude::*;
use codec::Encode;
pub(super) const PREFIX: &[u8] = b"session_historical";
pub(super) const LAST_PRUNE: &[u8] = b"session_historical_last_prune";
/// Derive the key used to store the list of validators
pub(super) fn derive_key<P: AsRef<[u8]>>(prefix: P, session_index: SessionIndex) -> Vec<u8> {
let prefix: &[u8] = prefix.as_ref();
session_index.using_encoded(|encoded_session_index| {
prefix.into_iter()
.chain(b"/".into_iter())
.chain(encoded_session_index.into_iter())
.copied()
.collect::<Vec<u8>>()
})
}