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migration.rs
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migration.rs
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// This file is part of Substrate.
// Copyright (C) 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.
//! Various pieces of common functionality.
use super::*;
use frame_support::traits::{Get, GetStorageVersion, PalletInfoAccess, StorageVersion};
/// Migrate the pallet storage to v1.
pub fn migrate_to_v1<T: Config<I>, I: 'static, P: GetStorageVersion + PalletInfoAccess>(
) -> frame_support::weights::Weight {
let on_chain_storage_version = <P as GetStorageVersion>::on_chain_storage_version();
log::info!(
target: LOG_TARGET,
"Running migration storage v1 for uniques with storage version {:?}",
on_chain_storage_version,
);
if on_chain_storage_version < 1 {
let mut count = 0;
for (collection, detail) in Collection::<T, I>::iter() {
CollectionAccount::<T, I>::insert(&detail.owner, &collection, ());
count += 1;
}
StorageVersion::new(1).put::<P>();
log::info!(
target: LOG_TARGET,
"Running migration storage v1 for uniques with storage version {:?} was complete",
on_chain_storage_version,
);
// calculate and return migration weights
T::DbWeight::get().reads_writes(count as u64 + 1, count as u64 + 1)
} else {
log::warn!(
target: LOG_TARGET,
"Attempted to apply migration to v1 but failed because storage version is {:?}",
on_chain_storage_version,
);
T::DbWeight::get().reads(1)
}
}