Kusama state version switch and migration. (#7015)

* State version switch and migration init

* fix

* migration declaration (last position, westend was first)

* revert unrelated cargo fmt

* move to unrelease

* fmt?

* fmt

* Change size of processing per blocks

* Dispatch error

polkadot/Cargo.lock

@@ -3853,6 +3853,7 @@ dependencies = [
  "pallet-society",
  "pallet-staking",
  "pallet-staking-runtime-api",
+ "pallet-state-trie-migration",
  "pallet-timestamp",
  "pallet-tips",
  "pallet-transaction-payment",

polkadot/runtime/kusama/Cargo.toml

@@ -73,6 +73,7 @@ pallet-session = { git = "https://github.com/paritytech/substrate", branch = "ma
 pallet-society = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 frame-support = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 pallet-staking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+pallet-state-trie-migration = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 pallet-staking-runtime-api = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 frame-system = {git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 frame-system-rpc-runtime-api = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
@@ -173,6 +174,7 @@ std = [
 	"pallet-society/std",
 	"pallet-staking/std",
 	"pallet-staking-runtime-api/std",
+	"pallet-state-trie-migration/std",
 	"pallet-timestamp/std",
 	"pallet-tips/std",
 	"pallet-treasury/std",
@@ -290,6 +292,7 @@ try-runtime = [
 	"pallet-session/try-runtime",
 	"pallet-society/try-runtime",
 	"pallet-staking/try-runtime",
+	"pallet-state-trie-migration/try-runtime",
 	"pallet-timestamp/try-runtime",
 	"pallet-tips/try-runtime",
 	"pallet-treasury/try-runtime",

polkadot/runtime/kusama/src/lib.rs

@@ -140,7 +140,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	#[cfg(feature = "disable-runtime-api")]
 	apis: sp_version::create_apis_vec![[]],
 	transaction_version: 23,
-	state_version: 0,
+	state_version: 1,
 };
 
 /// The BABE epoch configuration at genesis.
@@ -1340,6 +1340,26 @@ impl pallet_nomination_pools::Config for Runtime {
 	type MaxPointsToBalance = MaxPointsToBalance;
 }
 
+parameter_types! {
+	// The deposit configuration for the singed migration. Specially if you want to allow any signed account to do the migration (see `SignedFilter`, these deposits should be high)
+	pub const MigrationSignedDepositPerItem: Balance = 1 * CENTS;
+	pub const MigrationSignedDepositBase: Balance = 20 * CENTS * 100;
+	pub const MigrationMaxKeyLen: u32 = 512;
+}
+
+impl pallet_state_trie_migration::Config for Runtime {
+	type RuntimeEvent = RuntimeEvent;
+	type Currency = Balances;
+	type SignedDepositPerItem = MigrationSignedDepositPerItem;
+	type SignedDepositBase = MigrationSignedDepositBase;
+	type ControlOrigin = EnsureRoot<AccountId>;
+	type SignedFilter = frame_support::traits::NeverEnsureOrigin<AccountId>;
+
+	// Use same weights as substrate ones.
+	type WeightInfo = pallet_state_trie_migration::weights::SubstrateWeight<Runtime>;
+	type MaxKeyLen = MigrationMaxKeyLen;
+}
+
 construct_runtime! {
 	pub enum Runtime where
 		Block = Block,
@@ -1456,6 +1476,9 @@ construct_runtime! {
 		Auctions: auctions::{Pallet, Call, Storage, Event<T>} = 72,
 		Crowdloan: crowdloan::{Pallet, Call, Storage, Event<T>} = 73,
 
+		// State trie migration pallet, only temporary.
+		StateTrieMigration: pallet_state_trie_migration = 98,
+
 		// Pallet for sending XCM.
 		XcmPallet: pallet_xcm::{Pallet, Call, Storage, Event<T>, Origin, Config} = 99,
 
@@ -1534,6 +1557,7 @@ pub mod migrations {
 
 	/// Unreleased migrations. Add new ones here:
 	pub type Unreleased = (
+		init_state_migration::InitMigrate,
 		pallet_society::migrations::MigrateToV2<Runtime, (), past_payouts::PastPayouts>,
 		pallet_im_online::migration::v1::Migration<Runtime>,
 	);
@@ -2478,3 +2502,52 @@ mod remote_tests {
 		});
 	}
 }
+
+mod init_state_migration {
+	use super::Runtime;
+	use frame_support::traits::OnRuntimeUpgrade;
+	use pallet_state_trie_migration::{AutoLimits, MigrationLimits, MigrationProcess};
+	#[cfg(feature = "try-runtime")]
+	use sp_runtime::DispatchError;
+	#[cfg(not(feature = "std"))]
+	use sp_std::prelude::*;
+
+	/// Initialize an automatic migration process.
+	pub struct InitMigrate;
+	impl OnRuntimeUpgrade for InitMigrate {
+		#[cfg(feature = "try-runtime")]
+		fn pre_upgrade() -> Result<Vec<u8>, DispatchError> {
+			frame_support::ensure!(
+				AutoLimits::<Runtime>::get().is_none(),
+				DispatchError::Other("Automigration already started.")
+			);
+			Ok(Default::default())
+		}
+
+		fn on_runtime_upgrade() -> frame_support::weights::Weight {
+			if MigrationProcess::<Runtime>::get() == Default::default() &&
+				AutoLimits::<Runtime>::get().is_none()
+			{
+				// We use limits to target 600ko proofs per block and
+				// avg 800_000_000_000 of weight per block.
+				// See spreadsheet 4800_400 in
+				// https://raw.githubusercontent.com/cheme/substrate/try-runtime-mig/ksm.ods
+				AutoLimits::<Runtime>::put(Some(MigrationLimits { item: 4_800, size: 204800 * 2 }));
+				log::info!("Automatic trie migration started.");
+				<Runtime as frame_system::Config>::DbWeight::get().reads_writes(2, 1)
+			} else {
+				log::info!("Automatic trie migration not started.");
+				<Runtime as frame_system::Config>::DbWeight::get().reads(2)
+			}
+		}
+
+		#[cfg(feature = "try-runtime")]
+		fn post_upgrade(_state: Vec<u8>) -> Result<(), DispatchError> {
+			frame_support::ensure!(
+				AutoLimits::<Runtime>::get().is_some(),
+				DispatchError::Other("Automigration started.")
+			);
+			Ok(())
+		}
+	}
+}