referrerpolicy=no-referrer-when-downgrade

cumulus_pallet_parachain_system/
migration.rs

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// Copyright (C) Parity Technologies (UK) Ltd.
// This file is part of Cumulus.
// 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.

use crate::{Config, Pallet, ReservedDmpWeightOverride, ReservedXcmpWeightOverride};
use frame_support::{
	pallet_prelude::*,
	traits::{Get, OnRuntimeUpgrade, StorageVersion},
	weights::Weight,
};

/// The in-code storage version.
pub const STORAGE_VERSION: StorageVersion = StorageVersion::new(2);

/// Migrates the pallet storage to the most recent version.
pub struct Migration<T: Config>(PhantomData<T>);

impl<T: Config> OnRuntimeUpgrade for Migration<T> {
	fn on_runtime_upgrade() -> Weight {
		let mut weight: Weight = T::DbWeight::get().reads(2);

		if StorageVersion::get::<Pallet<T>>() == 0 {
			weight = weight
				.saturating_add(v1::migrate::<T>())
				.saturating_add(T::DbWeight::get().writes(1));
			StorageVersion::new(1).put::<Pallet<T>>();
		}

		if StorageVersion::get::<Pallet<T>>() == 1 {
			weight = weight
				.saturating_add(v2::migrate::<T>())
				.saturating_add(T::DbWeight::get().writes(1));
			StorageVersion::new(2).put::<Pallet<T>>();
		}

		weight
	}
}

/// V2: Migrate to 2D weights for ReservedXcmpWeightOverride and ReservedDmpWeightOverride.
mod v2 {
	use super::*;
	const DEFAULT_POV_SIZE: u64 = 64 * 1024; // 64 KB

	pub fn migrate<T: Config>() -> Weight {
		let translate = |pre: u64| -> Weight { Weight::from_parts(pre, DEFAULT_POV_SIZE) };

		if ReservedXcmpWeightOverride::<T>::translate(|pre| pre.map(translate)).is_err() {
			log::error!(
				target: "parachain_system",
				"unexpected error when performing translation of the ReservedXcmpWeightOverride type during storage upgrade to v2"
			);
		}

		if ReservedDmpWeightOverride::<T>::translate(|pre| pre.map(translate)).is_err() {
			log::error!(
				target: "parachain_system",
				"unexpected error when performing translation of the ReservedDmpWeightOverride type during storage upgrade to v2"
			);
		}

		T::DbWeight::get().reads_writes(2, 2)
	}
}

/// V1: `LastUpgrade` block number is removed from the storage since the upgrade
/// mechanism now uses signals instead of block offsets.
mod v1 {
	use crate::{Config, Pallet};
	#[allow(deprecated)]
	use frame_support::{migration::remove_storage_prefix, pallet_prelude::*};

	pub fn migrate<T: Config>() -> Weight {
		#[allow(deprecated)]
		remove_storage_prefix(<Pallet<T>>::name().as_bytes(), b"LastUpgrade", b"");
		T::DbWeight::get().writes(1)
	}
}