Transaction address decoding.

src/error.rs

@@ -97,6 +97,12 @@ impl From<ExecutionError> for Error {
 	}
 }
 
+impl From<CryptoError> for Error {
+	fn from(err: CryptoError) -> Error {
+		Error::Util(UtilError::Crypto(err))
+	}
+}
+
 // TODO: uncomment below once https://github.com/rust-lang/rust/issues/27336 sorted.
 /*#![feature(concat_idents)]
 macro_rules! assimilate {

src/executive.rs

@@ -94,24 +94,24 @@ impl<'a> Executive<'a> {
 	}
 
 	/// This funtion should be used to execute transaction.
-	pub fn transact(&mut self, t: &Transaction) -> ExecutionResult {
+	pub fn transact(&mut self, t: &Transaction) -> Result<Executed, Error> {
 		// TODO: validate transaction signature ?/ sender
 
-		let sender = t.sender();
+		let sender = try!(t.sender());
 		let nonce = self.state.nonce(&sender);
 
 		// validate transaction nonce
 		if t.nonce != nonce {
-			return Err(ExecutionError::InvalidNonce { expected: nonce, is: t.nonce });
+			return Err(From::from(ExecutionError::InvalidNonce { expected: nonce, is: t.nonce }));
 		}
 		
 		// validate if transaction fits into given block
 		if self.info.gas_used + t.gas > self.info.gas_limit {
-			return Err(ExecutionError::BlockGasLimitReached { 
+			return Err(From::from(ExecutionError::BlockGasLimitReached { 
 				gas_limit: self.info.gas_limit, 
 				gas_used: self.info.gas_used, 
 				gas: t.gas 
-			});
+			}));
 		}
 
 		// TODO: we might need bigints here, or at least check overflows.
@@ -121,7 +121,7 @@ impl<'a> Executive<'a> {
 
 		// avoid unaffordable transactions
 		if balance < total_cost {
-			return Err(ExecutionError::NotEnoughCash { required: total_cost, is: balance });
+			return Err(From::from(ExecutionError::NotEnoughCash { required: total_cost, is: balance }));
 		}
 
 		// NOTE: there can be no invalid transactions from this point.
@@ -160,7 +160,7 @@ impl<'a> Executive<'a> {
 		};
 
 		// finalize here!
-		self.finalize(t, substate, backup, res)
+		Ok(try!(self.finalize(t, substate, backup, res)))
 	}
 
 	/// Calls contract function with given contract params.
@@ -232,7 +232,7 @@ impl<'a> Executive<'a> {
 				// real ammount to refund
 				let refund = cmp::min(sstore_refunds + suicide_refunds, (t.gas - gas_left) / U256::from(2)) + gas_left;
 				let refund_value = refund * t.gas_price;
-				self.state.add_balance(&t.sender(), &refund_value);
+				self.state.add_balance(&t.sender().unwrap(), &refund_value);
 				
 				// fees earned by author
 				let fees = (t.gas - refund) * t.gas_price;

src/state.rs

@@ -2,7 +2,7 @@ use common::*;
 use engine::Engine;
 use executive::Executive;
 
-pub type ApplyResult = Result<Receipt, ExecutionError>;
+pub type ApplyResult = Result<Receipt, Error>;
 
 /// Representation of the entire state of all accounts in the system.
 pub struct State {

src/transaction.rs

@@ -1,5 +1,6 @@
 use util::*;
 use basic_types::*;
+use error::Error;
 
 pub enum Action {
 	Create,
@@ -77,8 +78,9 @@ impl Transaction {
 	pub fn action(&self) -> &Action { &self.action }
 
 	/// Returns transaction sender.
-	pub fn sender(&self) -> Address {
+	pub fn sender(&self) -> Result<Address, Error> {
-		Address::new()
+		let p = try!(ec::recover(&self.signature, &self.rlp_sha3_opt(Seal::Without)));
+		Ok(From::from(p.sha3()))
 	}
 }