Supporting blockid in eth_call and trace_call/trace_raw (#1837)

* Supporting blockid in eth_call and trace_call/trace_raw

* Nicer state diff handling

* Purging deref.deref

Cargo.lock

@@ -1542,13 +1542,13 @@ dependencies = [
 "checksum daemonize 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "271ec51b7e0bee92f0d04601422c73eb76ececf197026711c97ad25038a010cf"
 "checksum deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1614659040e711785ed8ea24219140654da1729f3ec8a47a9719d041112fe7bf"
 "checksum docopt 0.6.80 (registry+https://github.com/rust-lang/crates.io-index)" = "4cc0acb4ce0828c6a5a11d47baa432fe885881c27428c3a4e473e454ffe57a76"
-"checksum elastic-array 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a7ec9af4640023400b86c9ce9126c79ed17ab247ec10a2f530eb78e3893b51aa"
+"checksum elastic-array 0.4.0 (git+https://github.com/ethcore/elastic-array)" = "<none>"
 "checksum env_logger 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "aba65b63ffcc17ffacd6cf5aa843da7c5a25e3bd4bbe0b7def8b214e411250e5"
 "checksum eth-secp256k1 0.5.4 (git+https://github.com/ethcore/rust-secp256k1)" = "<none>"
 "checksum gcc 0.3.28 (registry+https://github.com/rust-lang/crates.io-index)" = "3da3a2cbaeb01363c8e3704fd9fd0eb2ceb17c6f27abd4c1ef040fb57d20dc79"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
 "checksum hamming 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "65043da274378d68241eb9a8f8f8aa54e349136f7b8e12f63e3ef44043cc30e1"
-"checksum heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "927f352867eb72d0ef81b0e2aa457cd9b0888b2d26672cf7ca5912d771215191"
+"checksum heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "abb306abb8d398e053cfb1b3e7b72c2f580be048b85745c52652954f8ad1439c"
 "checksum hpack 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3d2da7d3a34cf6406d9d700111b8eafafe9a251de41ae71d8052748259343b58"
 "checksum httparse 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "46534074dbb80b070d60a5cb8ecadd8963a00a438ae1a95268850a7ef73b67ae"
 "checksum hyper 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bb0f4d00bb781e559b6e66ae4b5479df0fdf9ab15949f52fa2f1f5de16d4cc07"

ethcore/src/block_queue.rs

@@ -226,7 +226,7 @@ impl BlockQueue {
 			};
 
 			let block_hash = block.header.hash();
-			match verify_block_unordered(block.header, block.bytes, engine.deref().deref()) {
+			match verify_block_unordered(block.header, block.bytes, &**engine) {
 				Ok(verified) => {
 					let mut verifying = verification.verifying.lock();
 					for e in verifying.iter_mut() {
@@ -319,7 +319,7 @@ impl BlockQueue {
 			}
 		}
 
-		match verify_block_basic(&header, &bytes, self.engine.deref().deref()) {
+		match verify_block_basic(&header, &bytes, &**self.engine) {
 			Ok(()) => {
 				self.processing.write().insert(h.clone());
 				self.verification.unverified.lock().push_back(UnverifiedBlock { header: header, bytes: bytes });

ethcore/src/client/client.rs

@@ -15,7 +15,6 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use std::collections::{HashSet, HashMap, VecDeque};
-use std::ops::Deref;
 use std::sync::{Arc, Weak};
 use std::path::{Path};
 use std::fmt;
@@ -35,7 +34,7 @@ use util::kvdb::*;
 
 // other
 use views::{BlockView, HeaderView, BodyView};
-use error::{ImportError, ExecutionError, ReplayError, BlockError, ImportResult};
+use error::{ImportError, ExecutionError, CallError, BlockError, ImportResult};
 use header::BlockNumber;
 use state::State;
 use spec::Spec;
@@ -272,7 +271,7 @@ impl Client {
 	}
 
 	fn check_and_close_block(&self, block: &PreverifiedBlock) -> Result<LockedBlock, ()> {
-		let engine = self.engine.deref().deref();
+		let engine = &**self.engine;
 		let header = &block.header;
 
 		// Check the block isn't so old we won't be able to enact it.
@@ -283,7 +282,7 @@ impl Client {
 		}
 
 		// Verify Block Family
-		let verify_family_result = self.verifier.verify_block_family(header, &block.bytes, engine, self.chain.deref());
+		let verify_family_result = self.verifier.verify_block_family(header, &block.bytes, engine, &*self.chain);
 		if let Err(e) = verify_family_result {
 			warn!(target: "client", "Stage 3 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
 			return Err(());
@@ -639,8 +638,8 @@ impl Client {
 }
 
 impl BlockChainClient for Client {
-	fn call(&self, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, ExecutionError> {
+	fn call(&self, t: &SignedTransaction, block: BlockID, analytics: CallAnalytics) -> Result<Executed, CallError> {
-		let header = self.block_header(BlockID::Latest).unwrap();
+		let header = try!(self.block_header(block).ok_or(CallError::StatePruned));
 		let view = HeaderView::new(&header);
 		let last_hashes = self.build_last_hashes(view.hash());
 		let env_info = EnvInfo {
@@ -653,7 +652,9 @@ impl BlockChainClient for Client {
 			gas_limit: U256::max_value(),
 		};
 		// that's just a copy of the state.
-		let mut state = self.state();
+		let mut state = try!(self.state_at(block).ok_or(CallError::StatePruned));
+		let original_state = if analytics.state_diffing { Some(state.clone()) } else { None };
+
 		let sender = try!(t.sender().map_err(|e| {
 			let message = format!("Transaction malformed: {:?}", e);
 			ExecutionError::TransactionMalformed(message)
@@ -665,26 +666,23 @@ impl BlockChainClient for Client {
 			state.add_balance(&sender, &(needed_balance - balance));
 		}
 		let options = TransactOptions { tracing: analytics.transaction_tracing, vm_tracing: analytics.vm_tracing, check_nonce: false };
-		let mut ret = Executive::new(&mut state, &env_info, self.engine.deref().deref(), &self.vm_factory).transact(t, options);
+		let mut ret = try!(Executive::new(&mut state, &env_info, &**self.engine, &self.vm_factory).transact(t, options));
 
 		// TODO gav move this into Executive.
-		if analytics.state_diffing {
+		ret.state_diff = original_state.map(|original| state.diff_from(original));
-			if let Ok(ref mut x) = ret {
+
-				x.state_diff = Some(state.diff_from(self.state()));
+		Ok(ret)
-			}
-		}
-		ret
 	}
 
-	fn replay(&self, id: TransactionID, analytics: CallAnalytics) -> Result<Executed, ReplayError> {
+	fn replay(&self, id: TransactionID, analytics: CallAnalytics) -> Result<Executed, CallError> {
-		let address = try!(self.transaction_address(id).ok_or(ReplayError::TransactionNotFound));
+		let address = try!(self.transaction_address(id).ok_or(CallError::TransactionNotFound));
-		let header_data = try!(self.block_header(BlockID::Hash(address.block_hash)).ok_or(ReplayError::StatePruned));
+		let header_data = try!(self.block_header(BlockID::Hash(address.block_hash)).ok_or(CallError::StatePruned));
-		let body_data = try!(self.block_body(BlockID::Hash(address.block_hash)).ok_or(ReplayError::StatePruned));
+		let body_data = try!(self.block_body(BlockID::Hash(address.block_hash)).ok_or(CallError::StatePruned));
-		let mut state = try!(self.state_at_beginning(BlockID::Hash(address.block_hash)).ok_or(ReplayError::StatePruned));
+		let mut state = try!(self.state_at_beginning(BlockID::Hash(address.block_hash)).ok_or(CallError::StatePruned));
 		let txs = BodyView::new(&body_data).transactions();
 
 		if address.index >= txs.len() {
-			return Err(ReplayError::TransactionNotFound);
+			return Err(CallError::TransactionNotFound);
 		}
 
 		let options = TransactOptions { tracing: analytics.transaction_tracing, vm_tracing: analytics.vm_tracing, check_nonce: false };
@@ -700,20 +698,18 @@ impl BlockChainClient for Client {
 			gas_limit: view.gas_limit(),
 		};
 		for t in txs.iter().take(address.index) {
-			match Executive::new(&mut state, &env_info, self.engine.deref().deref(), &self.vm_factory).transact(t, Default::default()) {
+			match Executive::new(&mut state, &env_info, &**self.engine, &self.vm_factory).transact(t, Default::default()) {
 				Ok(x) => { env_info.gas_used = env_info.gas_used + x.gas_used; }
-				Err(ee) => { return Err(ReplayError::Execution(ee)) }
+				Err(ee) => { return Err(CallError::Execution(ee)) }
 			}
 		}
 		let t = &txs[address.index];
-		let orig = state.clone();
+
-		let mut ret = Executive::new(&mut state, &env_info, self.engine.deref().deref(), &self.vm_factory).transact(t, options);
+		let original_state = if analytics.state_diffing { Some(state.clone()) } else { None };
-		if analytics.state_diffing {
+		let mut ret = try!(Executive::new(&mut state, &env_info, &**self.engine, &self.vm_factory).transact(t, options));
-			if let Ok(ref mut x) = ret {
+		ret.state_diff = original_state.map(|original| state.diff_from(original));
-				x.state_diff = Some(state.diff_from(orig));
+
-			}
+		Ok(ret)
-		}
-		ret.map_err(ReplayError::Execution)
 	}
 
 	fn keep_alive(&self) {
@@ -1002,7 +998,7 @@ impl BlockChainClient for Client {
 
 impl MiningBlockChainClient for Client {
 	fn prepare_open_block(&self, author: Address, gas_range_target: (U256, U256), extra_data: Bytes) -> OpenBlock {
-		let engine = self.engine.deref().deref();
+		let engine = &**self.engine;
 		let h = self.chain.best_block_hash();
 
 		let mut open_block = OpenBlock::new(

ethcore/src/client/test_client.rs

@@ -37,7 +37,7 @@ use spec::Spec;
 use block_queue::BlockQueueInfo;
 use block::{OpenBlock, SealedBlock};
 use executive::Executed;
-use error::{ExecutionError, ReplayError};
+use error::CallError;
 use trace::LocalizedTrace;
 
 /// Test client.
@@ -61,7 +61,7 @@ pub struct TestBlockChainClient {
 	/// Code.
 	pub code: RwLock<HashMap<Address, Bytes>>,
 	/// Execution result.
-	pub execution_result: RwLock<Option<Executed>>,
+	pub execution_result: RwLock<Option<Result<Executed, CallError>>>,
 	/// Transaction receipts.
 	pub receipts: RwLock<HashMap<TransactionID, LocalizedReceipt>>,
 	/// Block queue size.
@@ -125,7 +125,7 @@ impl TestBlockChainClient {
 	}
 
 	/// Set the execution result.
-	pub fn set_execution_result(&self, result: Executed) {
+	pub fn set_execution_result(&self, result: Result<Executed, CallError>) {
 		*self.execution_result.write() = Some(result);
 	}
 
@@ -292,12 +292,12 @@ impl MiningBlockChainClient for TestBlockChainClient {
 }
 
 impl BlockChainClient for TestBlockChainClient {
-	fn call(&self, _t: &SignedTransaction, _analytics: CallAnalytics) -> Result<Executed, ExecutionError> {
+	fn call(&self, _t: &SignedTransaction, _block: BlockID, _analytics: CallAnalytics) -> Result<Executed, CallError> {
-		Ok(self.execution_result.read().clone().unwrap())
+		self.execution_result.read().clone().unwrap()
 	}
 
-	fn replay(&self, _id: TransactionID, _analytics: CallAnalytics) -> Result<Executed, ReplayError> {
+	fn replay(&self, _id: TransactionID, _analytics: CallAnalytics) -> Result<Executed, CallError> {
-		Ok(self.execution_result.read().clone().unwrap())
+		self.execution_result.read().clone().unwrap()
 	}
 
 	fn block_total_difficulty(&self, _id: BlockID) -> Option<U256> {

ethcore/src/client/traits.rs

@@ -26,7 +26,7 @@ use transaction::{LocalizedTransaction, SignedTransaction};
 use log_entry::LocalizedLogEntry;
 use filter::Filter;
 use views::{BlockView};
-use error::{ImportResult, ExecutionError, ReplayError};
+use error::{ImportResult, CallError};
 use receipt::LocalizedReceipt;
 use trace::LocalizedTrace;
 use evm::Factory as EvmFactory;
@@ -154,11 +154,10 @@ pub trait BlockChainClient : Sync + Send {
 	fn logs(&self, filter: Filter) -> Vec<LocalizedLogEntry>;
 
 	/// Makes a non-persistent transaction call.
-	// TODO: should be able to accept blockchain location for call.
+	fn call(&self, t: &SignedTransaction, block: BlockID, analytics: CallAnalytics) -> Result<Executed, CallError>;
-	fn call(&self, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, ExecutionError>;
 
 	/// Replays a given transaction for inspection.
-	fn replay(&self, t: TransactionID, analytics: CallAnalytics) -> Result<Executed, ReplayError>;
+	fn replay(&self, t: TransactionID, analytics: CallAnalytics) -> Result<Executed, CallError>;
 
 	/// Returns traces matching given filter.
 	fn filter_traces(&self, filter: TraceFilter) -> Option<Vec<LocalizedTrace>>;

ethcore/src/error.rs

@@ -22,7 +22,7 @@ use basic_types::LogBloom;
 use client::Error as ClientError;
 use ipc::binary::{BinaryConvertError, BinaryConvertable};
 use types::block_import_error::BlockImportError;
-pub use types::executed::{ExecutionError, ReplayError};
+pub use types::executed::{ExecutionError, CallError};
 
 #[derive(Debug, PartialEq, Clone)]
 /// Errors concerning transaction processing.

ethcore/src/miner/miner.rs

@@ -464,7 +464,7 @@ impl MinerService for Miner {
 		}
 	}
 
-	fn call(&self, chain: &MiningBlockChainClient, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, ExecutionError> {
+	fn call(&self, chain: &MiningBlockChainClient, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, CallError> {
 		let sealing_work = self.sealing_work.lock();
 		match sealing_work.queue.peek_last_ref() {
 			Some(work) => {
@@ -484,6 +484,8 @@ impl MinerService for Miner {
 				};
 				// that's just a copy of the state.
 				let mut state = block.state().clone();
+				let original_state = if analytics.state_diffing { Some(state.clone()) } else { None };
+
 				let sender = try!(t.sender().map_err(|e| {
 					let message = format!("Transaction malformed: {:?}", e);
 					ExecutionError::TransactionMalformed(message)
@@ -495,18 +497,15 @@ impl MinerService for Miner {
 					state.add_balance(&sender, &(needed_balance - balance));
 				}
 				let options = TransactOptions { tracing: analytics.transaction_tracing, vm_tracing: analytics.vm_tracing, check_nonce: false };
-				let mut ret = Executive::new(&mut state, &env_info, self.engine(), chain.vm_factory()).transact(t, options);
+				let mut ret = try!(Executive::new(&mut state, &env_info, self.engine(), chain.vm_factory()).transact(t, options));
 
 				// TODO gav move this into Executive.
-				if analytics.state_diffing {
+				ret.state_diff = original_state.map(|original| state.diff_from(original));
-					if let Ok(ref mut x) = ret {
+
-						x.state_diff = Some(state.diff_from(block.state().clone()));
+				Ok(ret)
-					}
-				}
-				ret
 			},
 			None => {
-				chain.call(t, analytics)
+				chain.call(t, BlockID::Latest, analytics)
 			}
 		}
 	}

ethcore/src/miner/mod.rs

@@ -58,7 +58,7 @@ use util::{H256, U256, Address, Bytes};
 use client::{MiningBlockChainClient, Executed, CallAnalytics};
 use block::ClosedBlock;
 use receipt::Receipt;
-use error::{Error, ExecutionError};
+use error::{Error, CallError};
 use transaction::SignedTransaction;
 
 /// Miner client API
@@ -163,7 +163,7 @@ pub trait MinerService : Send + Sync {
 	fn balance(&self, chain: &MiningBlockChainClient, address: &Address) -> U256;
 
 	/// Call into contract code using pending state.
-	fn call(&self, chain: &MiningBlockChainClient, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, ExecutionError>;
+	fn call(&self, chain: &MiningBlockChainClient, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, CallError>;
 
 	/// Get storage value in pending state.
 	fn storage_at(&self, chain: &MiningBlockChainClient, address: &Address, position: &H256) -> H256;

ethcore/src/types/executed.rs

@@ -105,7 +105,7 @@ pub struct Executed {
 }
 
 /// Result of executing the transaction.
-#[derive(PartialEq, Debug, Binary)]
+#[derive(PartialEq, Debug, Clone, Binary)]
 pub enum ExecutionError {
 	/// Returned when there gas paid for transaction execution is
 	/// lower than base gas required.
@@ -172,19 +172,25 @@ impl fmt::Display for ExecutionError {
 }
 
 /// Result of executing the transaction.
-#[derive(PartialEq, Debug, Binary)]
+#[derive(PartialEq, Debug, Clone, Binary)]
-pub enum ReplayError {
+pub enum CallError {
 	/// Couldn't find the transaction in the chain.
 	TransactionNotFound,
-	/// Couldn't find the transaction block's state in the chain.
+	/// Couldn't find requested block's state in the chain.
 	StatePruned,
 	/// Error executing.
 	Execution(ExecutionError),
 }
 
-impl fmt::Display for ReplayError {
+impl From<ExecutionError> for CallError {
+	fn from(error: ExecutionError) -> Self {
+		CallError::Execution(error)
+	}
+}
+
+impl fmt::Display for CallError {
 	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-		use self::ReplayError::*;
+		use self::CallError::*;
 
 		let msg = match *self {
 			TransactionNotFound => "Transaction couldn't be found in the chain".into(),
@@ -192,7 +198,7 @@ impl fmt::Display for ReplayError {
 			Execution(ref e) => format!("{}", e),
 		};
 
-		f.write_fmt(format_args!("Transaction replay error ({}).", msg))
+		f.write_fmt(format_args!("Transaction execution error ({}).", msg))
 	}
 }
 

ethcore/src/types/ids.rs

@@ -23,7 +23,7 @@ use std::mem;
 use std::collections::VecDeque;
 
 /// Uniquely identifies block.
-#[derive(Debug, PartialEq, Clone, Hash, Eq, Binary)]
+#[derive(Debug, PartialEq, Copy, Clone, Hash, Eq, Binary)]
 pub enum BlockID {
 	/// Block's sha3.
 	/// Querying by hash is always faster.

rpc/src/v1/impls/eth.rs

@@ -44,8 +44,7 @@ use self::ethash::SeedHashCompute;
 use v1::traits::Eth;
 use v1::types::{Block, BlockTransactions, BlockNumber, Bytes, SyncStatus, SyncInfo, Transaction, CallRequest, Index, Filter, Log, Receipt, H64 as RpcH64, H256 as RpcH256, H160 as RpcH160, U256 as RpcU256};
 use v1::helpers::CallRequest as CRequest;
-use v1::impls::{default_gas_price, dispatch_transaction, error_codes};
+use v1::impls::{default_gas_price, dispatch_transaction, error_codes, from_params_default_second, from_params_default_third};
-use serde;
 
 /// Eth RPC options
 pub struct EthClientOptions {
@@ -215,27 +214,6 @@ pub fn pending_logs<M>(miner: &M, filter: &EthcoreFilter) -> Vec<Log> where M: M
 
 const MAX_QUEUE_SIZE_TO_MINE_ON: usize = 4;	// because uncles go back 6.
 
-fn params_len(params: &Params) -> usize {
-	match params {
-		&Params::Array(ref vec) => vec.len(),
-		_ => 0,
-	}
-}
-
-fn from_params_default_second<F>(params: Params) -> Result<(F, BlockNumber, ), Error> where F: serde::de::Deserialize {
-	match params_len(&params) {
-		1 => from_params::<(F, )>(params).map(|(f,)| (f, BlockNumber::Latest)),
-		_ => from_params::<(F, BlockNumber)>(params),
-	}
-}
-
-fn from_params_default_third<F1, F2>(params: Params) -> Result<(F1, F2, BlockNumber, ), Error> where F1: serde::de::Deserialize, F2: serde::de::Deserialize {
-	match params_len(&params) {
-		2 => from_params::<(F1, F2, )>(params).map(|(f1, f2)| (f1, f2, BlockNumber::Latest)),
-		_ => from_params::<(F1, F2, BlockNumber)>(params)
-	}
-}
-
 fn make_unsupported_err() -> Error {
 	Error {
 		code: ErrorCode::ServerError(error_codes::UNSUPPORTED_REQUEST_CODE),
@@ -656,8 +634,7 @@ impl<C, S: ?Sized, M, EM> Eth for EthClient<C, S, M, EM> where
 				let signed = try!(self.sign_call(request));
 				let r = match block_number {
 					BlockNumber::Pending => take_weak!(self.miner).call(take_weak!(self.client).deref(), &signed, Default::default()),
-					BlockNumber::Latest => take_weak!(self.client).call(&signed, Default::default()),
+					block_number => take_weak!(self.client).call(&signed, block_number.into(), Default::default()),
-					_ => panic!("{:?}", block_number),
 				};
 				to_value(&r.map(|e| Bytes(e.output)).unwrap_or(Bytes::new(vec![])))
 			})
@@ -671,8 +648,7 @@ impl<C, S: ?Sized, M, EM> Eth for EthClient<C, S, M, EM> where
 				let signed = try!(self.sign_call(request));
 				let r = match block_number {
 					BlockNumber::Pending => take_weak!(self.miner).call(take_weak!(self.client).deref(), &signed, Default::default()),
-					BlockNumber::Latest => take_weak!(self.client).call(&signed, Default::default()),
+					block => take_weak!(self.client).call(&signed, block.into(), Default::default()),
-					_ => return Err(Error::invalid_params()),
 				};
 				to_value(&RpcU256::from(r.map(|res| res.gas_used + res.refunded).unwrap_or(From::from(0))))
 			})

rpc/src/v1/impls/mod.rs

@@ -53,8 +53,9 @@ pub use self::ethcore_set::EthcoreSetClient;
 pub use self::traces::TracesClient;
 pub use self::rpc::RpcClient;
 
+use serde;
 use v1::helpers::TransactionRequest;
-use v1::types::{H256 as RpcH256, H520 as RpcH520};
+use v1::types::{H256 as RpcH256, H520 as RpcH520, BlockNumber};
 use ethcore::error::Error as EthcoreError;
 use ethcore::miner::MinerService;
 use ethcore::client::MiningBlockChainClient;
@@ -63,7 +64,7 @@ use ethcore::account_provider::{AccountProvider, Error as AccountError};
 use util::numbers::*;
 use util::rlp::encode;
 use util::bytes::ToPretty;
-use jsonrpc_core::{Error, ErrorCode, Value, to_value};
+use jsonrpc_core::{Error, ErrorCode, Value, to_value, from_params, Params};
 
 mod error_codes {
 	// NOTE [ToDr] Codes from [-32099, -32000]
@@ -79,6 +80,30 @@ mod error_codes {
 	pub const REQUEST_NOT_FOUND: i64 = -32041;
 }
 
+fn params_len(params: &Params) -> usize {
+	match params {
+		&Params::Array(ref vec) => vec.len(),
+		_ => 0,
+	}
+}
+
+/// Deserialize request parameters with optional second parameter `BlockNumber` defaulting to `BlockNumber::Latest`.
+pub fn from_params_default_second<F>(params: Params) -> Result<(F, BlockNumber, ), Error> where F: serde::de::Deserialize {
+	match params_len(&params) {
+		1 => from_params::<(F, )>(params).map(|(f,)| (f, BlockNumber::Latest)),
+		_ => from_params::<(F, BlockNumber)>(params),
+	}
+}
+
+/// Deserialize request parameters with optional third parameter `BlockNumber` defaulting to `BlockNumber::Latest`.
+pub fn from_params_default_third<F1, F2>(params: Params) -> Result<(F1, F2, BlockNumber, ), Error> where F1: serde::de::Deserialize, F2: serde::de::Deserialize {
+	match params_len(&params) {
+		2 => from_params::<(F1, F2, )>(params).map(|(f1, f2)| (f1, f2, BlockNumber::Latest)),
+		_ => from_params::<(F1, F2, BlockNumber)>(params)
+	}
+}
+
+
 fn dispatch_transaction<C, M>(client: &C, miner: &M, signed_transaction: SignedTransaction) -> Result<Value, Error>
 	where C: MiningBlockChainClient, M: MinerService {
 	let hash = RpcH256::from(signed_transaction.hash());

rpc/src/v1/impls/traces.rs

@@ -25,6 +25,7 @@ use ethcore::transaction::{Transaction as EthTransaction, SignedTransaction, Act
 use v1::traits::Traces;
 use v1::helpers::CallRequest as CRequest;
 use v1::types::{TraceFilter, LocalizedTrace, BlockNumber, Index, CallRequest, Bytes, TraceResults, H256};
+use v1::impls::from_params_default_third;
 
 fn to_call_analytics(flags: Vec<String>) -> CallAnalytics {
 	CallAnalytics {
@@ -122,11 +123,11 @@ impl<C, M> Traces for TracesClient<C, M> where C: BlockChainClient + 'static, M:
 
 	fn call(&self, params: Params) -> Result<Value, Error> {
 		try!(self.active());
-		from_params(params)
+		from_params_default_third(params)
-			.and_then(|(request, flags)| {
+			.and_then(|(request, flags, block)| {
 				let request = CallRequest::into(request);
 				let signed = try!(self.sign_call(request));
-				match take_weak!(self.client).call(&signed, to_call_analytics(flags)) {
+				match take_weak!(self.client).call(&signed, block.into(), to_call_analytics(flags)) {
 					Ok(e) => to_value(&TraceResults::from(e)),
 					_ => Ok(Value::Null),
 				}
@@ -135,11 +136,11 @@ impl<C, M> Traces for TracesClient<C, M> where C: BlockChainClient + 'static, M:
 
 	fn raw_transaction(&self, params: Params) -> Result<Value, Error> {
 		try!(self.active());
-		from_params::<(Bytes, _)>(params)
+		from_params_default_third(params)
-			.and_then(|(raw_transaction, flags)| {
+			.and_then(|(raw_transaction, flags, block)| {
-				let raw_transaction = raw_transaction.to_vec();
+				let raw_transaction = Bytes::to_vec(raw_transaction);
 				match UntrustedRlp::new(&raw_transaction).as_val() {
-					Ok(signed) => match take_weak!(self.client).call(&signed, to_call_analytics(flags)) {
+					Ok(signed) => match take_weak!(self.client).call(&signed, block.into(), to_call_analytics(flags)) {
 						Ok(e) => to_value(&TraceResults::from(e)),
 						_ => Ok(Value::Null),
 					},

rpc/src/v1/tests/helpers/miner_service.rs

@@ -18,7 +18,7 @@
 
 use util::{Address, H256, Bytes, U256, FixedHash, Uint};
 use util::standard::*;
-use ethcore::error::{Error, ExecutionError};
+use ethcore::error::{Error, CallError};
 use ethcore::client::{MiningBlockChainClient, Executed, CallAnalytics};
 use ethcore::block::{ClosedBlock, IsBlock};
 use ethcore::transaction::SignedTransaction;
@@ -220,7 +220,7 @@ impl MinerService for TestMinerService {
 		self.latest_closed_block.lock().as_ref().map_or_else(U256::zero, |b| b.block().fields().state.balance(address).clone())
 	}
 
-	fn call(&self, _chain: &MiningBlockChainClient, _t: &SignedTransaction, _analytics: CallAnalytics) -> Result<Executed, ExecutionError> {
+	fn call(&self, _chain: &MiningBlockChainClient, _t: &SignedTransaction, _analytics: CallAnalytics) -> Result<Executed, CallError> {
 		unimplemented!();
 	}
 

rpc/src/v1/tests/mocked/eth.rs

@@ -423,9 +423,9 @@ fn rpc_eth_code() {
 }
 
 #[test]
-fn rpc_eth_call() {
+fn rpc_eth_call_latest() {
 	let tester = EthTester::default();
-	tester.client.set_execution_result(Executed {
+	tester.client.set_execution_result(Ok(Executed {
 		gas: U256::zero(),
 		gas_used: U256::from(0xff30),
 		refunded: U256::from(0x5),
@@ -436,7 +436,7 @@ fn rpc_eth_call() {
 		trace: vec![],
 		vm_trace: None,
 		state_diff: None,
-	});
+	}));
 
 	let request = r#"{
 		"jsonrpc": "2.0",
@@ -458,9 +458,9 @@ fn rpc_eth_call() {
 }
 
 #[test]
-fn rpc_eth_call_default_block() {
+fn rpc_eth_call() {
 	let tester = EthTester::default();
-	tester.client.set_execution_result(Executed {
+	tester.client.set_execution_result(Ok(Executed {
 		gas: U256::zero(),
 		gas_used: U256::from(0xff30),
 		refunded: U256::from(0x5),
@@ -471,7 +471,42 @@ fn rpc_eth_call_default_block() {
 		trace: vec![],
 		vm_trace: None,
 		state_diff: None,
-	});
+	}));
+
+	let request = r#"{
+		"jsonrpc": "2.0",
+		"method": "eth_call",
+		"params": [{
+			"from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
+			"to": "0xd46e8dd67c5d32be8058bb8eb970870f07244567",
+			"gas": "0x76c0",
+			"gasPrice": "0x9184e72a000",
+			"value": "0x9184e72a",
+			"data": "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
+		},
+		"0x0"],
+		"id": 1
+	}"#;
+	let response = r#"{"jsonrpc":"2.0","result":"0x1234ff","id":1}"#;
+
+	assert_eq!(tester.io.handle_request(request), Some(response.to_owned()));
+}
+
+#[test]
+fn rpc_eth_call_default_block() {
+	let tester = EthTester::default();
+	tester.client.set_execution_result(Ok(Executed {
+		gas: U256::zero(),
+		gas_used: U256::from(0xff30),
+		refunded: U256::from(0x5),
+		cumulative_gas_used: U256::zero(),
+		logs: vec![],
+		contracts_created: vec![],
+		output: vec![0x12, 0x34, 0xff],
+		trace: vec![],
+		vm_trace: None,
+		state_diff: None,
+	}));
 
 	let request = r#"{
 		"jsonrpc": "2.0",
@@ -494,7 +529,7 @@ fn rpc_eth_call_default_block() {
 #[test]
 fn rpc_eth_estimate_gas() {
 	let tester = EthTester::default();
-	tester.client.set_execution_result(Executed {
+	tester.client.set_execution_result(Ok(Executed {
 		gas: U256::zero(),
 		gas_used: U256::from(0xff30),
 		refunded: U256::from(0x5),
@@ -505,7 +540,7 @@ fn rpc_eth_estimate_gas() {
 		trace: vec![],
 		vm_trace: None,
 		state_diff: None,
-	});
+	}));
 
 	let request = r#"{
 		"jsonrpc": "2.0",
@@ -529,7 +564,7 @@ fn rpc_eth_estimate_gas() {
 #[test]
 fn rpc_eth_estimate_gas_default_block() {
 	let tester = EthTester::default();
-	tester.client.set_execution_result(Executed {
+	tester.client.set_execution_result(Ok(Executed {
 		gas: U256::zero(),
 		gas_used: U256::from(0xff30),
 		refunded: U256::from(0x5),
@@ -540,7 +575,7 @@ fn rpc_eth_estimate_gas_default_block() {
 		trace: vec![],
 		vm_trace: None,
 		state_diff: None,
-	});
+	}));
 
 	let request = r#"{
 		"jsonrpc": "2.0",