Upgrade initializer should be mandatory

bridges/snowbridge/pallets/outbound-queue/src/mock.rs

@@ -134,7 +134,7 @@ where
 		command: Command::Upgrade {
 			impl_address: H160::zero(),
 			impl_code_hash: H256::zero(),
-			initializer: None,
+			initializer: Default::default(),
 		},
 	}
 }
@@ -152,10 +152,10 @@ where
 		command: Command::Upgrade {
 			impl_address: H160::zero(),
 			impl_code_hash: H256::zero(),
-			initializer: Some(Initializer {
+			initializer: Initializer {
 				params: (0..1000).map(|_| 1u8).collect::<Vec<u8>>(),
 				maximum_required_gas: 0,
-			}),
+			},
 		},
 	}
 }

bridges/snowbridge/pallets/outbound-queue/src/test.rs

@@ -85,7 +85,7 @@ fn process_message_yields_on_max_messages_per_block() {
 			command: Command::Upgrade {
 				impl_address: Default::default(),
 				impl_code_hash: Default::default(),
-				initializer: None,
+				initializer: Default::default(),
 			},
 		}
 		.encode();

bridges/snowbridge/pallets/system/src/lib.rs

@@ -175,7 +175,7 @@ pub mod pallet {
 		Upgrade {
 			impl_address: H160,
 			impl_code_hash: H256,
-			initializer_params_hash: Option<H256>,
+			initializer_params_hash: H256,
 		},
 		/// An CreateAgent message was sent to the Gateway
 		CreateAgent {
@@ -278,7 +278,7 @@ pub mod pallet {
 			origin: OriginFor<T>,
 			impl_address: H160,
 			impl_code_hash: H256,
-			initializer: Option<Initializer>,
+			initializer: Initializer,
 		) -> DispatchResult {
 			ensure_root(origin)?;
 
@@ -287,8 +287,7 @@ pub mod pallet {
 				Error::<T>::InvalidUpgradeParameters
 			);
 
-			let initializer_params_hash: Option<H256> =
-				initializer.as_ref().map(|i| H256::from(blake2_256(i.params.as_ref())));
+			let initializer_params_hash: H256 = blake2_256(initializer.params.as_ref()).into();
 			let command = Command::Upgrade { impl_address, impl_code_hash, initializer };
 			Self::send(PRIMARY_GOVERNANCE_CHANNEL, command, PaysFee::<T>::No)?;
 

bridges/snowbridge/pallets/system/src/tests.rs

@@ -87,12 +87,12 @@ fn upgrade_as_root() {
 		let address: H160 = [1_u8; 20].into();
 		let code_hash: H256 = [1_u8; 32].into();
 
-		assert_ok!(EthereumSystem::upgrade(origin, address, code_hash, None));
+		assert_ok!(EthereumSystem::upgrade(origin, address, code_hash, Default::default()));
 
 		System::assert_last_event(RuntimeEvent::EthereumSystem(crate::Event::Upgrade {
 			impl_address: address,
 			impl_code_hash: code_hash,
-			initializer_params_hash: None,
+			initializer_params_hash: hex!("0e5751c026e543b2e8ab2eb06099daa1d1e5df47778f7787faab45cdf12fe3a8").into()
 		}));
 	});
 }
@@ -104,19 +104,7 @@ fn upgrade_as_signed_fails() {
 		let address: H160 = Default::default();
 		let code_hash: H256 = Default::default();
 
-		assert_noop!(EthereumSystem::upgrade(origin, address, code_hash, None), BadOrigin);
-	});
-}
-
-#[test]
-fn upgrade_with_params() {
-	new_test_ext(true).execute_with(|| {
-		let origin = RuntimeOrigin::root();
-		let address: H160 = [1_u8; 20].into();
-		let code_hash: H256 = [1_u8; 32].into();
-		let initializer: Option<Initializer> =
-			Some(Initializer { params: [0; 256].into(), maximum_required_gas: 10000 });
-		assert_ok!(EthereumSystem::upgrade(origin, address, code_hash, initializer));
+		assert_noop!(EthereumSystem::upgrade(origin, address, code_hash, Default::default()), BadOrigin);
 	});
 }
 
@@ -607,9 +595,7 @@ fn charge_fee_for_upgrade() {
 		let origin = RuntimeOrigin::root();
 		let address: H160 = [1_u8; 20].into();
 		let code_hash: H256 = [1_u8; 32].into();
-		let initializer: Option<Initializer> =
-			Some(Initializer { params: [0; 256].into(), maximum_required_gas: 10000 });
-		assert_ok!(EthereumSystem::upgrade(origin, address, code_hash, initializer.clone()));
+		assert_ok!(EthereumSystem::upgrade(origin, address, code_hash, Default::default()));
 
 		// assert sovereign_balance does not change as we do not charge for sudo operations
 		let sovereign_account = sibling_sovereign_account::<Test>(para_id.into());

bridges/snowbridge/primitives/core/src/outbound.rs

@@ -82,8 +82,8 @@ mod v1 {
 			impl_address: H160,
 			/// Codehash of the implementation contract
 			impl_code_hash: H256,
-			/// Optionally invoke an initializer in the implementation contract
-			initializer: Option<Initializer>,
+			/// Invoke initializer delegated to the implementation contract
+			initializer: Initializer,
 		},
 		/// Create an agent representing a consensus system on Polkadot
 		CreateAgent {
@@ -169,9 +169,7 @@ mod v1 {
 					ethabi::encode(&[Token::Tuple(vec![
 						Token::Address(*impl_address),
 						Token::FixedBytes(impl_code_hash.as_bytes().to_owned()),
-						initializer
-							.clone()
-							.map_or(Token::Bytes(vec![]), |i| Token::Bytes(i.params)),
+						Token::Bytes(initializer.params.clone()),
 					])]),
 				Command::CreateAgent { agent_id } =>
 					ethabi::encode(&[Token::Tuple(vec![Token::FixedBytes(
@@ -218,6 +216,7 @@ mod v1 {
 	/// Representation of a call to the initializer of an implementation contract.
 	/// The initializer has the following ABI signature: `initialize(bytes)`.
 	#[derive(Clone, Encode, Decode, PartialEq, RuntimeDebug, TypeInfo)]
+	#[cfg_attr(feature = "std", derive(Default))]
 	pub struct Initializer {
 		/// ABI-encoded params of type `bytes` to pass to the initializer
 		pub params: Vec<u8>,
@@ -393,13 +392,9 @@ impl GasMeter for ConstantGasMeter {
 				AgentExecuteCommand::TransferToken { .. } => 100_000,
 			},
 			Command::Upgrade { initializer, .. } => {
-				let initializer_max_gas = match *initializer {
-					Some(Initializer { maximum_required_gas, .. }) => maximum_required_gas,
-					None => 0,
-				};
 				// total maximum gas must also include the gas used for updating the proxy before
 				// the the initializer is called.
-				50_000 + initializer_max_gas
+				50_000 + initializer.maximum_required_gas
 			},
 			Command::SetTokenTransferFees { .. } => 60_000,
 			Command::SetPricingParameters { .. } => 60_000,