Assign unique storage names to pallets. (#5010)

* Assign unique storage names to pallets.

* Bump spec

* Upgrade logic for finality tracker (untested)

* Logic for migrating Identity (untested)

* Logic for migrating transaction-payment

* Fix tests

* Fix `decl_storage` build

* Contract -> Contracts

* Update Cargo.lock

* bump spec

* update migration

* Fix merge error

* Migration for contracts

* Remove serde

* Remove some illegal spaces and Options

* Fix types in identity.

* Minor variable rename

Co-authored-by: Gavin Wood <gavin@parity.io>

substrate/frame/identity/src/lib.rs

@@ -80,6 +80,7 @@ use frame_system::{self as system, ensure_signed, ensure_root};
 
 #[cfg(feature = "runtime-benchmarks")]
 pub mod benchmarking;
+mod migration;
 
 type BalanceOf<T> = <<T as Trait>::Currency as Currency<<T as frame_system::Trait>::AccountId>>::Balance;
 type NegativeImbalanceOf<T> = <<T as Trait>::Currency as Currency<<T as frame_system::Trait>::AccountId>>::NegativeImbalance;
@@ -382,7 +383,7 @@ pub struct RegistrarInfo<
 }
 
 decl_storage! {
-	trait Store for Module<T: Trait> as Sudo {
+	trait Store for Module<T: Trait> as Identity {
 		/// Information that is pertinent to identify the entity behind an account.
 		pub IdentityOf get(fn identity):
 			map hasher(blake2_256) T::AccountId => Option<Registration<BalanceOf<T>>>;
@@ -873,6 +874,10 @@ decl_module! {
 
 			Self::deposit_event(RawEvent::IdentityKilled(target, deposit));
 		}
+
+		fn on_runtime_upgrade() {
+			migration::on_runtime_upgrade::<T>()
+		}
 	}
 }
 

substrate/frame/identity/src/migration.rs

@@ -0,0 +1,52 @@
+// Copyright 2020 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Migration code to update storage.
+
+use super::*;
+use frame_support::storage::migration::{put_storage_value, take_storage_value, StorageIterator};
+
+pub fn on_runtime_upgrade<T: Trait>() {
+	change_name_sudo_to_identity::<T>()
+}
+
+// Change the storage name used by this pallet from `Sudo` to `Identity`.
+//
+// Since the format of the storage items themselves have not changed, we do not
+// need to keep track of a storage version. If the runtime does not need to be
+// upgraded, nothing here will happen anyway.
+
+fn change_name_sudo_to_identity<T: Trait>() {
+	sp_runtime::print("Migrating Identity.");
+
+	for (hash, identity_of) in StorageIterator::<Registration<BalanceOf<T>>>::new(b"Sudo", b"IdentityOf").drain() {
+		put_storage_value(b"Identity", b"IdentityOf", &hash, identity_of);
+	}
+
+	for (hash, super_of) in StorageIterator::<(T::AccountId, Data)>::new(b"Sudo", b"SuperOf").drain() {
+		put_storage_value(b"Identity", b"SuperOf", &hash, super_of);
+	}
+
+	for (hash, subs_of) in StorageIterator::<(BalanceOf<T>, Vec<T::AccountId>)>::new(b"Sudo", b"SubsOf").drain() {
+		put_storage_value(b"Identity", b"SubsOf", &hash, subs_of);
+	}
+
+	if let Some(registrars) = take_storage_value::<Vec<Option<RegistrarInfo<BalanceOf<T>, T::AccountId>>>>(b"Sudo", b"Registrars", &[]) {
+		put_storage_value(b"Identity", b"Registrars", &[], registrars);
+	}
+
+	sp_runtime::print("Done Identity.");
+}