lib.rs

			let whitelist: Vec<TrackedStorageKey> = vec![
				// Block Number
				hex_literal::hex!("26aa394eea5630e07c48ae0c9558cef702a5c1b19ab7a04f536c519aca4983ac").to_vec().into(),
				// Total Issuance
				hex_literal::hex!("c2261276cc9d1f8598ea4b6a74b15c2f57c875e4cff74148e4628f264b974c80").to_vec().into(),
				// Execution Phase
				hex_literal::hex!("26aa394eea5630e07c48ae0c9558cef7ff553b5a9862a516939d82b3d3d8661a").to_vec().into(),
				// Event Count
				hex_literal::hex!("26aa394eea5630e07c48ae0c9558cef70a98fdbe9ce6c55837576c60c7af3850").to_vec().into(),
				// System Events
				hex_literal::hex!("26aa394eea5630e07c48ae0c9558cef780d41e5e16056765bc8461851072c9d7").to_vec().into(),
				// Treasury Account
				hex_literal::hex!("26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da95ecffd7b6c0f78751baa9d281e0bfa3a6d6f646c70792f74727372790000000000000000000000000000000000000000").to_vec().into(),
				// Dmp DownwardMessageQueueHeads
				hex_literal::hex!("63f78c98723ddc9073523ef3beefda0c4d7fefc408aac59dbfe80a72ac8e3ce5").to_vec().into(),
				// Dmp DownwardMessageQueues
				hex_literal::hex!("63f78c98723ddc9073523ef3beefda0ca95dac46c07a40d91506e7637ec4ba57").to_vec().into(),
				// Configuration ActiveConfig
				hex_literal::hex!("06de3d8a54d27e44a9d5ce189618f22db4b49d95320d9021994c850f25b8e385").to_vec().into(),
				// The transactional storage limit.
				hex_literal::hex!("3a7472616e73616374696f6e5f6c6576656c3a").to_vec().into(),
			];

			let mut batches = Vec::<BenchmarkBatch>::new();
			let params = (&config, &whitelist);

			add_benchmarks!(params, batches);

			Ok(batches)
		}
	}
}

#[cfg(test)]
mod test {
	use super::*;

	#[test]
	fn max_upward_message_size() {
		assert_eq!(
			ump_migrations::MAX_UPWARD_MESSAGE_SIZE,
			pallet_message_queue::MaxMessageLenOf::<Runtime>::get()
		);
	}
}

#[cfg(all(test, feature = "try-runtime"))]
mod remote_tests {
	use super::*;
	use frame_try_runtime::{runtime_decl_for_try_runtime::TryRuntime, UpgradeCheckSelect};
	use remote_externalities::{
		Builder, Mode, OfflineConfig, OnlineConfig, SnapshotConfig, Transport,
	};
	use std::env::var;

	#[tokio::test]
	async fn run_migrations() {
		if var("RUN_MIGRATION_TESTS").is_err() {
			return
		}

		sp_tracing::try_init_simple();
		let transport: Transport =
			var("WS").unwrap_or("wss://westend-rpc.polkadot.io:443".to_string()).into();
		let maybe_state_snapshot: Option<SnapshotConfig> = var("SNAP").map(|s| s.into()).ok();
		let mut ext = Builder::<Block>::default()
			.mode(if let Some(state_snapshot) = maybe_state_snapshot {
				Mode::OfflineOrElseOnline(
					OfflineConfig { state_snapshot: state_snapshot.clone() },
					OnlineConfig {
						transport,
						state_snapshot: Some(state_snapshot),
						..Default::default()
					},
				)
			} else {
				Mode::Online(OnlineConfig { transport, ..Default::default() })
			})
			.build()
			.await
			.unwrap();
		ext.execute_with(|| Runtime::on_runtime_upgrade(UpgradeCheckSelect::PreAndPost));
	}
}

mod clean_state_migration {
	use super::Runtime;
	use frame_support::{pallet_prelude::*, storage_alias, traits::OnRuntimeUpgrade};
	use pallet_state_trie_migration::MigrationLimits;

	#[cfg(not(feature = "std"))]
	use sp_std::prelude::*;

	#[storage_alias]
	type AutoLimits = StorageValue<StateTrieMigration, Option<MigrationLimits>, ValueQuery>;

	// Actual type of value is `MigrationTask<T>`, putting a dummy
	// one to avoid the trait constraint on T.
	// Since we only use `kill` it is fine.
	#[storage_alias]
	type MigrationProcess = StorageValue<StateTrieMigration, u32, ValueQuery>;

	#[storage_alias]
	type SignedMigrationMaxLimits = StorageValue<StateTrieMigration, MigrationLimits, OptionQuery>;

	/// Initialize an automatic migration process.
	pub struct CleanMigrate;

	impl OnRuntimeUpgrade for CleanMigrate {
		#[cfg(feature = "try-runtime")]
		fn pre_upgrade() -> Result<Vec<u8>, sp_runtime::TryRuntimeError> {
			Ok(Default::default())
		}

		fn on_runtime_upgrade() -> frame_support::weights::Weight {
			MigrationProcess::kill();
			AutoLimits::kill();
			SignedMigrationMaxLimits::kill();
			<Runtime as frame_system::Config>::DbWeight::get().writes(3)
		}

		#[cfg(feature = "try-runtime")]
		fn post_upgrade(_state: Vec<u8>) -> Result<(), sp_runtime::TryRuntimeError> {
			frame_support::ensure!(
				!AutoLimits::exists() && !SignedMigrationMaxLimits::exists(),
				"State migration clean.",
			);
			Ok(())
		}
	}
}