contracts: Reduce the API surface (#8359)

* contracts: Remove types and storage from the public interface

* contracts: Remove current_schedule() getter

* contracts: Improve documentation

* Update README.md

* Fix integration test

substrate/bin/node/cli/src/chain_spec.rs

@@ -295,10 +295,9 @@ pub fn testnet_genesis(
 			phantom: Default::default(),
 		},
 		pallet_contracts: ContractsConfig {
-			current_schedule: pallet_contracts::Schedule {
-				enable_println, // this should only be enabled on development chains
-				..Default::default()
-			},
+			// println should only be enabled on development chains
+			current_schedule: pallet_contracts::Schedule::default()
+				.enable_println(enable_println),
 		},
 		pallet_sudo: SudoConfig {
 			key: root_key,

substrate/bin/node/executor/tests/basic.rs

@@ -656,13 +656,10 @@ fn deploying_wasm_contract_should_work() {
 	).0.unwrap();
 
 	t.execute_with(|| {
-		// Verify that the contract constructor worked well and code of TRANSFER contract is actually deployed.
-		assert_eq!(
-			&pallet_contracts::ContractInfoOf::<Runtime>::get(addr)
-				.and_then(|c| c.get_alive())
-				.unwrap()
-				.code_hash,
-			&transfer_ch
+		// Verify that the contract does exist by querying some of its storage items
+		// It does not matter that the storage item itself does not exist.
+		assert!(
+			&pallet_contracts::Pallet::<Runtime>::get_storage(addr, Default::default()).is_ok()
 		);
 	});
 }

substrate/bin/node/runtime/src/lib.rs

@@ -744,11 +744,11 @@ impl pallet_tips::Config for Runtime {
 }
 
 parameter_types! {
-	pub const TombstoneDeposit: Balance = deposit(
+	pub TombstoneDeposit: Balance = deposit(
 		1,
-		sp_std::mem::size_of::<pallet_contracts::ContractInfo<Runtime>>() as u32
+		<pallet_contracts::Pallet<Runtime>>::contract_info_size(),
 	);
-	pub const DepositPerContract: Balance = TombstoneDeposit::get();
+	pub DepositPerContract: Balance = TombstoneDeposit::get();
 	pub const DepositPerStorageByte: Balance = deposit(0, 1);
 	pub const DepositPerStorageItem: Balance = deposit(1, 0);
 	pub RentFraction: Perbill = Perbill::from_rational(1u32, 30 * DAYS);