[pallet-revive] Add Pallet::set_evm_balance (#9617)

Part of #9553
See paritytech/foundry-polkadot#273

Adds a balance setter in EVM. 


## Integration

Should not affect downstream projects.

---------

Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: PG Herveou <pgherveou@gmail.com>

Author: 3 people

prdoc/pr_9617.prdoc

@@ -0,0 +1,9 @@
+title: '[pallet-revive] Add setting evm balance'
+doc:
+- audience: Runtime User
+  description: |-
+    Adds a balance setter in EVM for pallet-revive.
+
+crates:
+- name: pallet-revive
+  bump: minor

substrate/frame/revive/src/lib.rs

@@ -580,7 +580,9 @@ pub mod pallet {
 	#[pallet::genesis_build]
 	impl<T: Config> BuildGenesisConfig for GenesisConfig<T>
 	where
-		BalanceOf<T>: Into<U256> + TryFrom<U256>,
+		BalanceOf<T>: Into<U256> + TryFrom<U256> + Bounded,
+		MomentOf<T>: Into<U256>,
+		T::Hash: frame_support::traits::IsType<H256>,
 	{
 		fn build(&self) {
 			use crate::{exec::Key, vm::ContractBlob};
@@ -602,17 +604,8 @@ pub mod pallet {
 			let owner = Pallet::<T>::account_id();
 
 			for genesis::Account { address, balance, nonce, contract_data } in &self.accounts {
-				let Ok(balance_with_dust) =
-					BalanceWithDust::<BalanceOf<T>>::from_value::<T>(*balance).inspect_err(|err| {
-						log::error!(target: LOG_TARGET, "Failed to convert balance for {address:?}: {err:?}");
-					})
-				else {
-					continue;
-				};
 				let account_id = T::AddressMapper::to_account_id(address);
-				let (value, dust) = balance_with_dust.deconstruct();
 
-				let _ = T::Currency::set_balance(&account_id, value);
 				frame_system::Account::<T>::mutate(&account_id, |info| {
 					info.nonce = (*nonce).into();
 				});
@@ -621,7 +614,7 @@ pub mod pallet {
 					None => {
 						AccountInfoOf::<T>::insert(
 							address,
-							AccountInfo { account_type: AccountType::EOA, dust },
+							AccountInfo { account_type: AccountType::EOA, dust: 0 },
 						);
 					},
 					Some(genesis::ContractData { code, storage }) => {
@@ -650,7 +643,7 @@ pub mod pallet {
 
 						AccountInfoOf::<T>::insert(
 							address,
-							AccountInfo { account_type: info.clone().into(), dust },
+							AccountInfo { account_type: info.clone().into(), dust: 0 },
 						);
 
 						<PristineCode<T>>::insert(blob.code_hash(), code);
@@ -662,6 +655,10 @@ pub mod pallet {
 						}
 					},
 				}
+
+				let _ = Pallet::<T>::set_evm_balance(address, *balance).inspect_err(|err| {
+					log::error!(target: LOG_TARGET, "Failed to set EVM balance for {address:?}: {err:?}");
+				});
 			}
 		}
 	}
@@ -1539,11 +1536,32 @@ where
 	}
 
 	/// Get the balance with EVM decimals of the given `address`.
+	///
+	/// Returns the spendable balance excluding the existential deposit.
 	pub fn evm_balance(address: &H160) -> U256 {
 		let balance = AccountInfo::<T>::balance((*address).into());
 		Self::convert_native_to_evm(balance)
 	}
 
+	/// Set the EVM balance of an account.
+	///
+	/// The account's total balance becomes the EVM value plus the existential deposit,
+	/// consistent with `evm_balance` which returns the spendable balance excluding the existential
+	/// deposit.
+	pub fn set_evm_balance(address: &H160, evm_value: U256) -> Result<(), Error<T>> {
+		let ed = T::Currency::minimum_balance();
+		let balance_with_dust = BalanceWithDust::<BalanceOf<T>>::from_value::<T>(evm_value)
+			.map_err(|_| <Error<T>>::BalanceConversionFailed)?;
+		let (value, dust) = balance_with_dust.deconstruct();
+		let account_id = T::AddressMapper::to_account_id(&address);
+		T::Currency::set_balance(&account_id, ed.saturating_add(value));
+		AccountInfoOf::<T>::mutate(address, |account| {
+			account.as_mut().map(|a| a.dust = dust);
+		});
+
+		Ok(())
+	}
+
 	/// Get the nonce for the given `address`.
 	pub fn evm_nonce(address: &H160) -> u32
 	where

substrate/frame/revive/src/tests.rs

@@ -460,7 +460,7 @@ impl Default for Origin<Test> {
 fn ext_builder_with_genesis_config_works() {
 	let pvm_contract = Account {
 		address: BOB_ADDR,
-		balance: U256::from(100),
+		balance: U256::from(100_000_100),
 		nonce: 42,
 		contract_data: Some(ContractData {
 			code: compile_module("dummy").unwrap().0,
@@ -470,7 +470,7 @@ fn ext_builder_with_genesis_config_works() {
 
 	let evm_contract = Account {
 		address: CHARLIE_ADDR,
-		balance: U256::from(100),
+		balance: U256::from(1_000_00_100),
 		nonce: 43,
 		contract_data: Some(ContractData {
 			code: vec![revm::bytecode::opcode::RETURN],

substrate/frame/revive/src/tests/pvm.rs

@@ -193,6 +193,22 @@ fn eth_call_transfer_with_dust_works() {
 	});
 }
 
+#[test]
+fn set_evm_balance_works() {
+	let (binary, _) = compile_module("dummy").unwrap();
+	ExtBuilder::default().existential_deposit(200).build().execute_with(|| {
+		let _ = <Test as Config>::Currency::set_balance(&ALICE, 1_000_000);
+		let Contract { addr, .. } =
+			builder::bare_instantiate(Code::Upload(binary)).build_and_unwrap_contract();
+		let native_with_dust = BalanceWithDust::new_unchecked::<Test>(100, 10);
+		let evm_value = Pallet::<Test>::convert_native_to_evm(native_with_dust);
+
+		assert_ok!(Pallet::<Test>::set_evm_balance(&addr, evm_value));
+
+		assert_eq!(Pallet::<Test>::evm_balance(&addr), evm_value);
+	});
+}
+
 #[test]
 fn contract_call_transfer_with_dust_works() {
 	let (binary_caller, _code_hash_caller) = compile_module("call_with_value").unwrap();