Contracts add code_len to ContractsInfo (#14523)

frame/contracts/src/migration/v12.rs

@@ -80,6 +80,7 @@ pub struct CodeInfo<T: Config> {
 	#[codec(compact)]
 	refcount: u64,
 	determinism: Determinism,
+	code_len: u32,
 }
 
 #[storage_alias]
@@ -177,6 +178,7 @@ impl<T: Config> MigrationStep for Migration<T> {
 				owner: old_info.owner,
 				deposit,
 				refcount: old_info.refcount,
+				code_len: code_len as u32,
 			};
 
 			let amount = old_info.deposit.saturating_sub(info.deposit);
@@ -221,6 +223,7 @@ impl<T: Config> MigrationStep for Migration<T> {
 					deposit: v.deposit,
 					refcount: v.refcount,
 					owner: v.owner,
+					code_len: module.code.len() as u32,
 				};
 				(k, info)
 			})

frame/contracts/src/tests.rs

@@ -1,4 +1,5 @@
 // This file is part of Substrate.
+mod pallet_dummy;
 
 // Copyright (C) Parity Technologies (UK) Ltd.
 // SPDX-License-Identifier: Apache-2.0
@@ -72,6 +73,7 @@ frame_support::construct_runtime!(
 		Utility: pallet_utility::{Pallet, Call, Storage, Event},
 		Contracts: pallet_contracts::{Pallet, Call, Storage, Event<T>},
 		Proxy: pallet_proxy::{Pallet, Call, Storage, Event<T>},
+		Dummy: pallet_dummy
 	}
 );
 
@@ -378,6 +380,8 @@ impl pallet_proxy::Config for Test {
 	type AnnouncementDepositFactor = ConstU64<1>;
 }
 
+impl pallet_dummy::Config for Test {}
+
 parameter_types! {
 	pub MySchedule: Schedule<Test> = {
 		let schedule = <Schedule<Test>>::default();
@@ -3004,7 +3008,7 @@ fn gas_estimation_call_runtime() {
 		.unwrap()
 		.account_id;
 
-		let addr_callee = Contracts::bare_instantiate(
+		Contracts::bare_instantiate(
 			ALICE,
 			min_balance * 100,
 			GAS_LIMIT,
@@ -3016,15 +3020,11 @@ fn gas_estimation_call_runtime() {
 			CollectEvents::Skip,
 		)
 		.result
-		.unwrap()
-		.account_id;
+		.unwrap();
 
 		// Call something trivial with a huge gas limit so that we can observe the effects
 		// of pre-charging. This should create a difference between consumed and required.
-		let call = RuntimeCall::Balances(pallet_balances::Call::transfer_allow_death {
-			dest: addr_callee,
-			value: min_balance * 10,
-		});
+		let call = RuntimeCall::Dummy(pallet_dummy::Call::overestimate_pre_charge {});
 		let result = Contracts::bare_call(
 			ALICE,
 			addr_caller.clone(),

frame/contracts/src/tests/pallet_dummy.rs

@@ -0,0 +1,33 @@
+pub use pallet::*;
+
+#[frame_support::pallet(dev_mode)]
+pub mod pallet {
+	use frame_support::{
+		dispatch::{Pays, PostDispatchInfo},
+		pallet_prelude::DispatchResultWithPostInfo,
+		weights::Weight,
+	};
+	use frame_system::pallet_prelude::*;
+
+	#[pallet::pallet]
+	pub struct Pallet<T>(_);
+
+	#[pallet::config]
+	pub trait Config: frame_system::Config {}
+
+	#[pallet::call]
+	impl<T: Config> Pallet<T> {
+		/// Dummy function that overcharges the predispatch weight, allowing us to test the correct
+		/// values of [`ContractResult::gas_consumed`] and [`ContractResult::gas_required`] in
+		/// tests.
+		#[pallet::call_index(1)]
+		#[pallet::weight(Weight::from_parts(10_000_000, 0))]
+		pub fn overestimate_pre_charge(origin: OriginFor<T>) -> DispatchResultWithPostInfo {
+			ensure_signed(origin)?;
+			Ok(PostDispatchInfo {
+				actual_weight: Some(Weight::from_parts(100, 0)),
+				pays_fee: Pays::Yes,
+			})
+		}
+	}
+}

frame/contracts/src/wasm/mod.rs

@@ -92,6 +92,8 @@ pub struct CodeInfo<T: Config> {
 	/// to be run on-chain. Specifically, such a code can never be instantiated into a contract
 	/// and can just be used through a delegate call.
 	determinism: Determinism,
+	/// length of the code in bytes.
+	code_len: u32,
 }
 
 /// Defines the required determinism level of a wasm blob when either running or uploading code.
@@ -268,15 +270,11 @@ impl<T: Config> WasmBlob<T> {
 	fn load_code(
 		code_hash: CodeHash<T>,
 		gas_meter: &mut GasMeter<T>,
-	) -> Result<CodeVec<T>, DispatchError> {
-		let max_code_len = T::MaxCodeLen::get();
-		let charged = gas_meter.charge(CodeLoadToken(max_code_len))?;
-
+	) -> Result<(CodeVec<T>, CodeInfo<T>), DispatchError> {
+		let code_info = <CodeInfoOf<T>>::get(code_hash).ok_or(Error::<T>::CodeNotFound)?;
+		gas_meter.charge(CodeLoadToken(code_info.code_len))?;
 		let code = <PristineCode<T>>::get(code_hash).ok_or(Error::<T>::CodeNotFound)?;
-		let code_len = code.len() as u32;
-		gas_meter.adjust_gas(charged, CodeLoadToken(code_len));
-
-		Ok(code)
+		Ok((code, code_info))
 	}
 
 	/// Create the module without checking the passed code.
@@ -309,13 +307,7 @@ impl<T: Config> Executable<T> for WasmBlob<T> {
 		code_hash: CodeHash<T>,
 		gas_meter: &mut GasMeter<T>,
 	) -> Result<Self, DispatchError> {
-		let code = Self::load_code(code_hash, gas_meter)?;
-		// We store `code_info` at the same time as contract code,
-		// therefore this query shouldn't really fail.
-		// We consider its failure equal to `CodeNotFound`, as contract code without
-		// `code_info` is unusable in this pallet.
-		let code_info = <CodeInfoOf<T>>::get(code_hash).ok_or(Error::<T>::CodeNotFound)?;
-
+		let (code, code_info) = Self::load_code(code_hash, gas_meter)?;
 		Ok(Self { code, code_info, code_hash })
 	}
 

frame/contracts/src/wasm/prepare.rs

@@ -286,11 +286,12 @@ where
 	validate::<E, T>(code.as_ref(), schedule, determinism)?;
 
 	// Calculate deposit for storing contract code and `code_info` in two different storage items.
-	let bytes_added = code.len().saturating_add(<CodeInfo<T>>::max_encoded_len()) as u32;
+	let code_len = code.len() as u32;
+	let bytes_added = code_len.saturating_add(<CodeInfo<T>>::max_encoded_len() as u32);
 	let deposit = Diff { bytes_added, items_added: 2, ..Default::default() }
 		.update_contract::<T>(None)
 		.charge_or_zero();
-	let code_info = CodeInfo { owner, deposit, determinism, refcount: 0 };
+	let code_info = CodeInfo { owner, deposit, determinism, refcount: 0, code_len };
 	let code_hash = T::Hashing::hash(&code);
 
 	Ok(WasmBlob { code, code_info, code_hash })
@@ -320,6 +321,7 @@ pub mod benchmarking {
 			// this is a helper function for benchmarking which skips deposit collection
 			deposit: Default::default(),
 			refcount: 0,
+			code_len: code.len() as u32,
 			determinism,
 		};
 		let code_hash = T::Hashing::hash(&code);