fix nonce hanlding and emit event on success execution (#130)

frame/ethereum/src/lib.rs

@@ -81,7 +81,10 @@ decl_storage! {
 
 decl_event!(
 	/// Ethereum pallet events.
-	pub enum Event { }
+	pub enum Event {
+		/// An ethereum transaction was successfully executed. [from, transaction_hash]
+		Executed(H160, H256),
+	}
 );
 
 
@@ -149,7 +152,11 @@ decl_module! {
 
 			let source = Self::recover_signer(&transaction).ok_or_else(|| Error::<T>::InvalidSignature)?;
 
+			let hash = transaction.message_hash(Some(T::ChainId::get()));
+
 			Self::execute(source, transaction)?;
+
+			Self::deposit_event(Event::Executed(source, hash));
 		}
 
 		fn on_finalize(n: T::BlockNumber) {
@@ -183,9 +190,6 @@ impl<T: Trait> frame_support::unsigned::ValidateUnsigned for Module<T> {
 			if transaction.nonce < account_data.nonce {
 				return InvalidTransaction::Stale.into();
 			}
-			if transaction.nonce > account_data.nonce {
-				return InvalidTransaction::Future.into();
-			}
 
 			let fee = transaction.gas_price.saturating_mul(transaction.gas_limit);
 
@@ -194,10 +198,12 @@ impl<T: Trait> frame_support::unsigned::ValidateUnsigned for Module<T> {
 			}
 
 			let mut builder = ValidTransaction::with_tag_prefix("Ethereum")
-				.and_provides((&account_data, account_data.nonce));
+				.and_provides((&origin, transaction.nonce));
 
-			if let Some(prev_nonce) = account_data.nonce.checked_sub(1.into()) {
-				builder = builder.and_requires((account_data, prev_nonce))
+			if transaction.nonce > account_data.nonce {
+				if let Some(prev_nonce) = transaction.nonce.checked_sub(1.into()) {
+					builder = builder.and_requires((origin, prev_nonce))
+				}
 			}
 
 			builder.build()

frame/ethereum/src/mock.rs

@@ -235,7 +235,7 @@ impl UnsignedTransaction {
 		s.append(&self.action);
 		s.append(&self.value);
 		s.append(&self.input);
-		s.append(&42u8); // TODO: move this chain id into the frame ethereum configuration
+		s.append(&ChainId::get());
 		s.append(&0u8);
 		s.append(&0u8);
 	}
@@ -246,20 +246,14 @@ impl UnsignedTransaction {
 		H256::from_slice(&Keccak256::digest(&stream.drain()).as_slice())
 	}
 
-	pub fn sign(self, key: &H256) -> Transaction {
+	pub fn sign(&self, key: &H256) -> Transaction {
 		let hash = self.signing_hash();
-		let msg = {
-			let mut a = [0u8; 32];
-			for i in 0..32 {
-				a[i] = hash[i];
-			}
-			secp256k1::Message::parse(&a)
-		};
+		let msg = secp256k1::Message::parse(hash.as_fixed_bytes());
 		let s = secp256k1::sign(&msg, &secp256k1::SecretKey::parse_slice(&key[..]).unwrap());
 		let sig = s.0.serialize();
 
 		let sig = TransactionSignature::new(
-			0x78,
+			s.1.serialize() as u64 % 2 + ChainId::get() * 2 + 35,
 			H256::from_slice(&sig[0..32]),
 			H256::from_slice(&sig[32..64]),
 		)
@@ -271,7 +265,7 @@ impl UnsignedTransaction {
 			gas_limit: self.gas_limit,
 			action: self.action,
 			value: self.value,
-			input: self.input,
+			input: self.input.clone(),
 			signature: sig,
 		}
 	}

frame/ethereum/src/tests.rs

@@ -37,15 +37,19 @@ use sp_runtime::transaction_validity::{TransactionSource, InvalidTransaction};
 // }
 const ERC20_CONTRACT_BYTECODE: &str = "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";
 
-fn default_erc20_creation_transaction(account: &AccountInfo) -> Transaction {
+fn default_erc20_creation_unsigned_transaction() -> UnsignedTransaction {
 	UnsignedTransaction {
 		nonce: U256::zero(),
 		gas_price: U256::from(1),
 		gas_limit: U256::from(0x100000),
 		action: ethereum::TransactionAction::Create,
 		value: U256::zero(),
 		input: FromHex::from_hex(ERC20_CONTRACT_BYTECODE).unwrap(),
-	}.sign(&account.private_key)
+	}
+}
+
+fn default_erc20_creation_transaction(account: &AccountInfo) -> Transaction {
+	default_erc20_creation_unsigned_transaction().sign(&account.private_key)
 }
 
 #[test]
@@ -100,10 +104,18 @@ fn transaction_with_invalid_nonce_should_not_work() {
 
 	ext.execute_with(|| {
 		// nonce is 0
-		let mut transaction = default_erc20_creation_transaction(alice);
+		let mut transaction = default_erc20_creation_unsigned_transaction();
 		transaction.nonce = U256::from(1);
 
-		assert_err!(Ethereum::validate_unsigned(TransactionSource::External, &Call::transact(transaction.clone())), InvalidTransaction::Future);
+		let signed = transaction.sign(&alice.private_key);
+
+		assert_eq!(
+			Ethereum::validate_unsigned(TransactionSource::External, &Call::transact(signed)),
+			ValidTransaction::with_tag_prefix("Ethereum")
+				.and_provides((&alice.address, U256::from(1)))
+				.and_requires((&alice.address, U256::from(0)))
+				.build()
+		);
 
 		// nonce is 1
 		assert_ok!(Ethereum::execute(
@@ -113,7 +125,9 @@ fn transaction_with_invalid_nonce_should_not_work() {
 
 		transaction.nonce = U256::from(0);
 
-		assert_err!(Ethereum::validate_unsigned(TransactionSource::External, &Call::transact(transaction)), InvalidTransaction::Stale);
+		let signed2 = transaction.sign(&alice.private_key);
+
+		assert_err!(Ethereum::validate_unsigned(TransactionSource::External, &Call::transact(signed2)), InvalidTransaction::Stale);
 	});
 }