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migrate pallet-elections-phragmen to attribute macros (#8044)
* All done * Fix benchmarks * Apply suggestions from code review Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com> * Fix metadata. * Fix build * Add migrations * Fix * Update frame/elections-phragmen/src/migrations/v4.rs * Better migeation test * More test * Fix warn * Update frame/elections-phragmen/src/lib.rs Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com> * Fix test * early exit * Fix * Fix build Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
This commit is contained in:
Kian Paimani
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// This file is part of Substrate.
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// Copyright (C) 2019-2020 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Migrations to version [`3.0.0`], as denoted by the changelog.
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use codec::{Encode, Decode, FullCodec};
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use sp_std::prelude::*;
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use frame_support::{
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RuntimeDebug, weights::Weight, Twox64Concat,
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traits::{GetPalletVersion, PalletVersion},
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};
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#[derive(Encode, Decode, Clone, Default, RuntimeDebug, PartialEq)]
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struct SeatHolder<AccountId, Balance> {
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who: AccountId,
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stake: Balance,
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deposit: Balance,
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}
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#[derive(Encode, Decode, Clone, Default, RuntimeDebug, PartialEq)]
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struct Voter<AccountId, Balance> {
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votes: Vec<AccountId>,
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stake: Balance,
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deposit: Balance,
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}
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/// Trait to implement to give information about types used for migration
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pub trait V2ToV3 {
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/// elections-phragmen module, used to check storage version.
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type Module: GetPalletVersion;
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/// System config account id
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type AccountId: 'static + FullCodec;
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/// Elections-phragmen currency balance.
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type Balance: 'static + FullCodec + Copy;
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}
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frame_support::generate_storage_alias!(
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PhragmenElection, Candidates<T: V2ToV3> => Value<Vec<(T::AccountId, T::Balance)>>
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);
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frame_support::generate_storage_alias!(
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PhragmenElection, Members<T: V2ToV3> => Value<Vec<SeatHolder<T::AccountId, T::Balance>>>
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);
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frame_support::generate_storage_alias!(
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PhragmenElection, RunnersUp<T: V2ToV3> => Value<Vec<SeatHolder<T::AccountId, T::Balance>>>
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);
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frame_support::generate_storage_alias!(
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PhragmenElection, Voting<T: V2ToV3> => Map<
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(Twox64Concat, T::AccountId),
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Voter<T::AccountId, T::Balance>
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>
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);
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/// Apply all of the migrations from 2_0_0 to 3_0_0.
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///
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/// ### Warning
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///
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/// This code will **ONLY** check that the storage version is less than or equal to 2_0_0.
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/// Further check might be needed at the user runtime.
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///
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/// Be aware that this migration is intended to be used only for the mentioned versions. Use
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/// with care and run at your own risk.
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pub fn apply<T: V2ToV3>(old_voter_bond: T::Balance, old_candidacy_bond: T::Balance) -> Weight {
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let maybe_storage_version = <T::Module as GetPalletVersion>::storage_version();
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log::info!(
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target: "runtime::elections-phragmen",
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"Running migration for elections-phragmen with storage version {:?}",
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maybe_storage_version,
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);
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match maybe_storage_version {
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Some(storage_version) if storage_version <= PalletVersion::new(2, 0, 0) => {
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migrate_voters_to_recorded_deposit::<T>(old_voter_bond);
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migrate_candidates_to_recorded_deposit::<T>(old_candidacy_bond);
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migrate_runners_up_to_recorded_deposit::<T>(old_candidacy_bond);
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migrate_members_to_recorded_deposit::<T>(old_candidacy_bond);
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Weight::max_value()
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}
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_ => {
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log::warn!(
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target: "runtime::elections-phragmen",
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"Attempted to apply migration to V3 but failed because storage version is {:?}",
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maybe_storage_version,
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);
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0
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},
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}
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}
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/// Migrate from the old legacy voting bond (fixed) to the new one (per-vote dynamic).
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pub fn migrate_voters_to_recorded_deposit<T: V2ToV3>(old_deposit: T::Balance) {
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<Voting<T>>::translate::<(T::Balance, Vec<T::AccountId>), _>(
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|_who, (stake, votes)| {
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Some(Voter {
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votes,
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stake,
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deposit: old_deposit,
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})
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},
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);
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log::info!(
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target: "runtime::elections-phragmen",
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"migrated {} voter accounts.",
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<Voting<T>>::iter().count(),
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);
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}
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/// Migrate all candidates to recorded deposit.
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pub fn migrate_candidates_to_recorded_deposit<T: V2ToV3>(old_deposit: T::Balance) {
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let _ = <Candidates<T>>::translate::<Vec<T::AccountId>, _>(
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|maybe_old_candidates| {
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maybe_old_candidates.map(|old_candidates| {
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log::info!(
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target: "runtime::elections-phragmen",
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"migrated {} candidate accounts.",
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old_candidates.len(),
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);
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old_candidates
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.into_iter()
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.map(|c| (c, old_deposit))
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.collect::<Vec<_>>()
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})
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},
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);
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}
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/// Migrate all members to recorded deposit.
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pub fn migrate_members_to_recorded_deposit<T: V2ToV3>(old_deposit: T::Balance) {
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let _ = <Members<T>>::translate::<Vec<(T::AccountId, T::Balance)>, _>(
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|maybe_old_members| {
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maybe_old_members.map(|old_members| {
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log::info!(
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target: "runtime::elections-phragmen",
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"migrated {} member accounts.",
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old_members.len(),
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);
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old_members
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.into_iter()
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.map(|(who, stake)| SeatHolder {
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who,
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stake,
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deposit: old_deposit,
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})
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.collect::<Vec<_>>()
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})
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},
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);
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}
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/// Migrate all runners-up to recorded deposit.
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pub fn migrate_runners_up_to_recorded_deposit<T: V2ToV3>(old_deposit: T::Balance) {
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let _ = <RunnersUp<T>>::translate::<Vec<(T::AccountId, T::Balance)>, _>(
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|maybe_old_runners_up| {
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maybe_old_runners_up.map(|old_runners_up| {
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log::info!(
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target: "runtime::elections-phragmen",
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"migrated {} runner-up accounts.",
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old_runners_up.len(),
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);
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old_runners_up
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.into_iter()
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.map(|(who, stake)| SeatHolder {
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who,
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stake,
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deposit: old_deposit,
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})
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.collect::<Vec<_>>()
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})
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},
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);
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}
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