pallet_aura/
migrations.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//! Migrations for the AURA pallet.
19
20use frame_support::{pallet_prelude::*, traits::Get, weights::Weight};
21
22struct __LastTimestamp<T>(core::marker::PhantomData<T>);
23impl<T: RemoveLastTimestamp> frame_support::traits::StorageInstance for __LastTimestamp<T> {
24	fn pallet_prefix() -> &'static str {
25		T::PalletPrefix::get()
26	}
27	const STORAGE_PREFIX: &'static str = "LastTimestamp";
28}
29
30type LastTimestamp<T> = StorageValue<__LastTimestamp<T>, (), ValueQuery>;
31
32pub trait RemoveLastTimestamp: super::Config {
33	type PalletPrefix: Get<&'static str>;
34}
35
36/// Remove the `LastTimestamp` storage value.
37///
38/// This storage value was removed and replaced by `CurrentSlot`. As we only remove this storage
39/// value, it is safe to call this method multiple times.
40///
41/// This migration requires a type `T` that implements [`RemoveLastTimestamp`].
42pub fn remove_last_timestamp<T: RemoveLastTimestamp>() -> Weight {
43	LastTimestamp::<T>::kill();
44	T::DbWeight::get().writes(1)
45}
pallet_aura/migrations.rs

pallet_aura/
migrations.rs
