Limiting result of the execution to execution-specific errors (#1071)

* execution error/result limiting

* missing trailing comma

* fix executive tests

* adding original error as string to the generic transaction error

* 'mallformed'-s all around

ethcore/src/client/client.rs

@@ -424,7 +424,7 @@ impl<V> Client<V> where V: Verifier {
 }
 
 impl<V> BlockChainClient for Client<V> where V: Verifier {
-	fn call(&self, t: &SignedTransaction) -> Result<Executed, Error> {
+	fn call(&self, t: &SignedTransaction) -> Result<Executed, ExecutionError> {
 		let header = self.block_header(BlockId::Latest).unwrap();
 		let view = HeaderView::new(&header);
 		let last_hashes = self.build_last_hashes(view.hash());
@@ -439,7 +439,10 @@ impl<V> BlockChainClient for Client<V> where V: Verifier {
 		};
 		// that's just a copy of the state.
 		let mut state = self.state();
-		let sender = try!(t.sender());
+		let sender = try!(t.sender().map_err(|e| {
+			let message = format!("Transaction malformed: {:?}", e);
+			ExecutionError::TransactionMalformed(message)
+		}));
 		let balance = state.balance(&sender);
 		// give the sender max balance
 		state.sub_balance(&sender, &balance);

ethcore/src/client/mod.rs

@@ -42,7 +42,7 @@ use header::{BlockNumber, Header};
 use transaction::{LocalizedTransaction, SignedTransaction};
 use log_entry::LocalizedLogEntry;
 use filter::Filter;
-use error::{ImportResult, Error};
+use error::{ImportResult, ExecutionError};
 use receipt::LocalizedReceipt;
 use engine::{Engine};
 use trace::LocalizedTrace;
@@ -133,7 +133,7 @@ pub trait BlockChainClient : Sync + Send {
 	fn try_seal(&self, block: LockedBlock, seal: Vec<Bytes>) -> Result<SealedBlock, LockedBlock>;
 
 	/// Makes a non-persistent transaction call.
-	fn call(&self, t: &SignedTransaction) -> Result<Executed, Error>;
+	fn call(&self, t: &SignedTransaction) -> Result<Executed, ExecutionError>;
 
 	/// Attempt to seal the block internally. See `Engine`.
 	fn generate_seal(&self, block: &ExecutedBlock, accounts: Option<&AccountProvider>) -> Option<Vec<Bytes>> { self.engine().generate_seal(block, accounts) }

ethcore/src/client/test_client.rs

@@ -31,7 +31,7 @@ use error::{ImportResult};
 use block_queue::BlockQueueInfo;
 use block::{SealedBlock, ClosedBlock, LockedBlock};
 use executive::Executed;
-use error::Error;
+use error::{ExecutionError};
 use engine::Engine;
 use trace::LocalizedTrace;
 
@@ -221,7 +221,7 @@ impl TestBlockChainClient {
 }
 
 impl BlockChainClient for TestBlockChainClient {
-	fn call(&self, _t: &SignedTransaction) -> Result<Executed, Error> {
+	fn call(&self, _t: &SignedTransaction) -> Result<Executed, ExecutionError> {
 		Ok(self.execution_result.read().unwrap().clone().unwrap())
 	}
 

ethcore/src/error.rs

@@ -59,7 +59,9 @@ pub enum ExecutionError {
 		got: U512
 	},
 	/// Returned when internal evm error occurs.
-	Internal
+	Internal,
+	/// Returned when generic transaction occurs
+	TransactionMalformed(String),
 }
 
 #[derive(Debug, PartialEq)]

ethcore/src/executive.rs

@@ -119,7 +119,7 @@ impl<'a> Executive<'a> {
 	}
 
 	/// This function should be used to execute transaction.
-	pub fn transact(&'a mut self, t: &SignedTransaction, options: TransactOptions) -> Result<Executed, Error> {
+	pub fn transact(&'a mut self, t: &SignedTransaction, options: TransactOptions) -> Result<Executed, ExecutionError> {
 		let check = options.check_nonce;
 		match options.tracing {
 			true => self.transact_with_tracer(t, check, ExecutiveTracer::default()),
@@ -128,8 +128,11 @@ impl<'a> Executive<'a> {
 	}
 
 	/// Execute transaction/call with tracing enabled
-	pub fn transact_with_tracer<T>(&'a mut self, t: &SignedTransaction, check_nonce: bool, mut tracer: T) -> Result<Executed, Error> where T: Tracer {
-		let sender = try!(t.sender());
+	pub fn transact_with_tracer<T>(&'a mut self, t: &SignedTransaction, check_nonce: bool, mut tracer: T) -> Result<Executed, ExecutionError> where T: Tracer {
+		let sender = try!(t.sender().map_err(|e| {
+			let message = format!("Transaction malformed: {:?}", e);
+			ExecutionError::TransactionMalformed(message)
+		}));
 		let nonce = self.state.nonce(&sender);
 
 		let schedule = self.engine.schedule(self.info);
@@ -983,8 +986,8 @@ mod tests {
 		};
 
 		match res {
-			Err(Error::Util(UtilError::Crypto(CryptoError::InvalidSignature))) => (),
-			_ => assert!(false, "Expected invalid signature error.")
+			Err(ExecutionError::TransactionMalformed(_)) => (),
+			_ => assert!(false, "Expected an invalid transaction error.")
 		}
 	}
 
@@ -1015,7 +1018,7 @@ mod tests {
 		};
 
 		match res {
-			Err(Error::Execution(ExecutionError::InvalidNonce { expected, got }))
+			Err(ExecutionError::InvalidNonce { expected, got })
 				if expected == U256::zero() && got == U256::one() => (),
 			_ => assert!(false, "Expected invalid nonce error.")
 		}
@@ -1049,7 +1052,7 @@ mod tests {
 		};
 
 		match res {
-			Err(Error::Execution(ExecutionError::BlockGasLimitReached { gas_limit, gas_used, gas }))
+			Err(ExecutionError::BlockGasLimitReached { gas_limit, gas_used, gas })
 				if gas_limit == U256::from(100_000) && gas_used == U256::from(20_000) && gas == U256::from(80_001) => (),
 			_ => assert!(false, "Expected block gas limit error.")
 		}
@@ -1083,7 +1086,7 @@ mod tests {
 		};
 
 		match res {
-			Err(Error::Execution(ExecutionError::NotEnoughCash { required , got }))
+			Err(ExecutionError::NotEnoughCash { required , got })
 				if required == U512::from(100_018) && got == U512::from(100_017) => (),
 			_ => assert!(false, "Expected not enough cash error. {:?}", res)
 		}