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pallet-grandpa: Remove
GRANDPA_AUTHORITIES_KEY (paritytech#2181)
Remove the `GRANDPA_AUTHORITIES_KEY` key and its usage. Apparently this was used in the early days to communicate the grandpa authorities to the node. However, we have now a runtime api that does this for us. So, this pull request is moving from the custom managed storage item to a FRAME managed storage item. This pr also includes a migration for doing the switch on a running chain. --------- Co-authored-by: Davide Galassi <davxy@datawok.net>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| // This file is part of Substrate. | ||
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| // Copyright (C) Parity Technologies (UK) Ltd. | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| // 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. | ||
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| use crate::{BoundedAuthorityList, Pallet}; | ||
| use codec::Decode; | ||
| use frame_support::{ | ||
| migrations::VersionedMigration, | ||
| storage, | ||
| traits::{Get, OnRuntimeUpgrade}, | ||
| weights::Weight, | ||
| }; | ||
| use sp_consensus_grandpa::AuthorityList; | ||
| use sp_std::{marker::PhantomData, vec::Vec}; | ||
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| const GRANDPA_AUTHORITIES_KEY: &[u8] = b":grandpa_authorities"; | ||
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| fn load_authority_list() -> AuthorityList { | ||
| storage::unhashed::get_raw(GRANDPA_AUTHORITIES_KEY).map_or_else( | ||
| || Vec::new(), | ||
| |l| <(u8, AuthorityList)>::decode(&mut &l[..]).unwrap_or_default().1, | ||
| ) | ||
| } | ||
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| /// Actual implementation of [`MigrateV4ToV5`]. | ||
| pub struct MigrateImpl<T>(PhantomData<T>); | ||
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| impl<T: crate::Config> OnRuntimeUpgrade for MigrateImpl<T> { | ||
| #[cfg(feature = "try-runtime")] | ||
| fn pre_upgrade() -> Result<Vec<u8>, sp_runtime::TryRuntimeError> { | ||
| use codec::Encode; | ||
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| let authority_list_len = load_authority_list().len() as u32; | ||
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| if authority_list_len > T::MaxAuthorities::get() { | ||
| return Err( | ||
| "Grandpa: `Config::MaxAuthorities` is smaller than the actual number of authorities.".into() | ||
| ) | ||
| } | ||
|
|
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| if authority_list_len == 0 { | ||
| return Err("Grandpa: Authority list is empty!".into()) | ||
| } | ||
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| Ok(authority_list_len.encode()) | ||
| } | ||
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| #[cfg(feature = "try-runtime")] | ||
| fn post_upgrade(state: Vec<u8>) -> Result<(), sp_runtime::TryRuntimeError> { | ||
| let len = u32::decode(&mut &state[..]).unwrap(); | ||
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| frame_support::ensure!( | ||
| len == crate::Pallet::<T>::grandpa_authorities().len() as u32, | ||
| "Grandpa: pre-migrated and post-migrated list should have the same length" | ||
| ); | ||
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| frame_support::ensure!( | ||
| load_authority_list().is_empty(), | ||
| "Old authority list shouldn't exist anymore" | ||
| ); | ||
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| Ok(()) | ||
| } | ||
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| fn on_runtime_upgrade() -> Weight { | ||
| crate::Authorities::<T>::put( | ||
| &BoundedAuthorityList::<T::MaxAuthorities>::force_from( | ||
| load_authority_list(), | ||
| Some("Grandpa: `Config::MaxAuthorities` is smaller than the actual number of authorities.") | ||
| ) | ||
| ); | ||
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| storage::unhashed::kill(GRANDPA_AUTHORITIES_KEY); | ||
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| T::DbWeight::get().reads_writes(1, 2) | ||
| } | ||
| } | ||
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| /// Migrate the storage from V4 to V5. | ||
| /// | ||
| /// Switches from `GRANDPA_AUTHORITIES_KEY` to a normal FRAME storage item. | ||
| pub type MigrateV4ToV5<T> = | ||
| VersionedMigration<4, 5, MigrateImpl<T>, Pallet<T>, <T as frame_system::Config>::DbWeight>; |
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