Integrate state diffing into the ethcore JSONRPC

ethcore/src/account.rs

@@ -51,8 +51,6 @@ impl Account {
 		}
 	}
 
-	#[cfg(test)]
-	#[cfg(feature = "json-tests")]
 	/// General constructor.
 	pub fn from_pod(pod: PodAccount) -> Account {
 		Account {

ethcore/src/client/client.rs

@@ -37,7 +37,7 @@ use filter::Filter;
 use log_entry::LocalizedLogEntry;
 use block_queue::{BlockQueue, BlockQueueInfo};
 use blockchain::{BlockChain, BlockProvider, TreeRoute, ImportRoute};
-use client::{BlockID, TransactionID, UncleID, TraceId, ClientConfig, BlockChainClient, MiningBlockChainClient, TraceFilter};
+use client::{BlockID, TransactionID, UncleID, TraceId, ClientConfig, BlockChainClient, MiningBlockChainClient, TraceFilter, CallAnalytics};
 use client::Error as ClientError;
 use env_info::EnvInfo;
 use executive::{Executive, Executed, TransactOptions, contract_address};
@@ -429,14 +429,14 @@ impl<V> Client<V> where V: Verifier {
 			TransactionID::Hash(ref hash) => self.chain.transaction_address(hash),
 			TransactionID::Location(id, index) => Self::block_hash(&self.chain, id).map(|hash| TransactionAddress {
 				block_hash: hash,
-				index: index
+				index: index,
 			})
 		}
 	}
 }
 
 impl<V> BlockChainClient for Client<V> where V: Verifier {
-	fn call(&self, t: &SignedTransaction, vm_tracing: bool) -> Result<Executed, ExecutionError> {
+	fn call(&self, t: &SignedTransaction, analytics: CallAnalytics) -> 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());
@@ -456,11 +456,21 @@ impl<V> BlockChainClient for Client<V> where V: Verifier {
 			ExecutionError::TransactionMalformed(message)
 		}));
 		let balance = state.balance(&sender);
-		// give the sender a decent balance
-		state.sub_balance(&sender, &balance);
-		state.add_balance(&sender, &(U256::from(1) << 200));
-		let options = TransactOptions { tracing: false, vm_tracing: vm_tracing, check_nonce: false };
-		Executive::new(&mut state, &env_info, self.engine.deref().deref(), &self.vm_factory).transact(t, options)
+		let needed_balance = t.value + t.gas * t.gas_price;
+		if balance < needed_balance {
+			// give the sender a sufficient balance
+			state.add_balance(&sender, &(needed_balance - balance));
+		}
+		let options = TransactOptions { tracing: false, 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);
+
+		// TODO gav move this into Executive.
+		if analytics.state_diffing {
+			if let Ok(ref mut x) = ret {
+				x.state_diff = Some(state.diff_from(self.state()));
+			}
+		}
+		ret
 	}
 
 	fn vm_factory(&self) -> &EvmFactory {
@@ -505,7 +515,6 @@ impl<V> BlockChainClient for Client<V> where V: Verifier {
 		self.state_at(id).map(|s| s.nonce(address))
 	}
 
-
 	fn block_hash(&self, id: BlockID) -> Option<H256> {
 		Self::block_hash(&self.chain, id)
 	}

ethcore/src/client/mod.rs

@@ -49,6 +49,15 @@ use evm::Factory as EvmFactory;
 use miner::{TransactionImportResult};
 use error::Error as EthError;
 
+/// Options concerning what analytics we run on the call.
+#[derive(Eq, PartialEq, Default, Clone, Copy, Debug)]
+pub struct CallAnalytics {
+	/// Make a VM trace.
+	pub vm_tracing: bool,
+	/// Make a diff.
+	pub state_diffing: bool,
+}
+
 /// Blockchain database client. Owns and manages a blockchain and a block queue.
 pub trait BlockChainClient : Sync + Send {
 	/// Get raw block header data by block id.
@@ -158,7 +167,7 @@ pub trait BlockChainClient : Sync + Send {
 
 	/// Makes a non-persistent transaction call.
 	// TODO: should be able to accept blockchain location for call.
-	fn call(&self, t: &SignedTransaction, vm_tracing: bool) -> Result<Executed, ExecutionError>;
+	fn call(&self, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, ExecutionError>;
 
 	/// Returns EvmFactory.
 	fn vm_factory(&self) -> &EvmFactory;

ethcore/src/client/test_client.rs

@@ -20,7 +20,7 @@ use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrder};
 use util::*;
 use transaction::{Transaction, LocalizedTransaction, SignedTransaction, Action};
 use blockchain::TreeRoute;
-use client::{BlockChainClient, MiningBlockChainClient, BlockChainInfo, BlockStatus, BlockID, TransactionID, UncleID, TraceId, TraceFilter, LastHashes};
+use client::{BlockChainClient, MiningBlockChainClient, BlockChainInfo, BlockStatus, BlockID, TransactionID, UncleID, TraceId, TraceFilter, LastHashes, CallAnalytics};
 use header::{Header as BlockHeader, BlockNumber};
 use filter::Filter;
 use log_entry::LocalizedLogEntry;
@@ -251,7 +251,7 @@ impl MiningBlockChainClient for TestBlockChainClient {
 }
 
 impl BlockChainClient for TestBlockChainClient {
-	fn call(&self, _t: &SignedTransaction, _vm_tracing: bool) -> Result<Executed, ExecutionError> {
+	fn call(&self, _t: &SignedTransaction, _analytics: CallAnalytics) -> Result<Executed, ExecutionError> {
 		Ok(self.execution_result.read().unwrap().clone().unwrap())
 	}
 

ethcore/src/executive.rs

@@ -450,6 +450,7 @@ impl<'a> Executive<'a> {
 					output: output,
 					trace: trace,
 					vm_trace: vm_trace,
+					state_diff: None,
 				})
 			},
 			_ => {
@@ -463,6 +464,7 @@ impl<'a> Executive<'a> {
 					output: output,
 					trace: trace,
 					vm_trace: vm_trace,
+					state_diff: None,
 				})
 			},
 		}

ethcore/src/json_tests/state.rs

@@ -16,8 +16,7 @@
 
 use super::test_common::*;
 use tests::helpers::*;
-use pod_state::*;
-use state_diff::*;
+use pod_state::{self, PodState};
 use ethereum;
 use ethjson;
 
@@ -71,7 +70,7 @@ pub fn json_chain_test(json_data: &[u8], era: ChainEra) -> Vec<String> {
 					let our_post = state.to_pod();
 					println!("Got:\n{}", our_post);
 					println!("Expect:\n{}", post);
-					println!("Diff ---expect -> +++got:\n{}", StateDiff::diff_pod(&post, &our_post));
+					println!("Diff ---expect -> +++got:\n{}", pod_state::diff_pod(&post, &our_post));
 				}
 
 				if let Ok(r) = res {

ethcore/src/lib.rs

@@ -119,8 +119,6 @@ mod basic_types;
 #[macro_use] mod evm;
 mod env_info;
 mod pod_account;
-mod account_diff;
-mod state_diff;
 mod state;
 mod account;
 mod account_db;

ethcore/src/miner/miner.rs

@@ -20,10 +20,9 @@ use std::sync::atomic::AtomicBool;
 use util::*;
 use util::keys::store::{AccountProvider};
 use views::{BlockView, HeaderView};
-use client::{MiningBlockChainClient, BlockID};
+use client::{MiningBlockChainClient, Executive, Executed, EnvInfo, TransactOptions, BlockChainClient, BlockID, CallAnalytics};
 use block::{ClosedBlock, IsBlock};
 use error::*;
-use client::{Executive, Executed, EnvInfo, TransactOptions};
 use transaction::SignedTransaction;
 use receipt::{Receipt};
 use spec::Spec;
@@ -251,11 +250,13 @@ impl MinerService for Miner {
 		}
 	}
 
-	fn call(&self, chain: &MiningBlockChainClient, t: &SignedTransaction, vm_tracing: bool) -> Result<Executed, ExecutionError> {
+	fn call(&self, chain: &MiningBlockChainClient, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, ExecutionError> {
 		let sealing_work = self.sealing_work.lock().unwrap();
 		match sealing_work.peek_last_ref() {
 			Some(work) => {
 				let block = work.block();
+
+				// TODO: merge this code with client.rs's fn call somwhow.
 				let header = block.header();
 				let last_hashes = chain.last_hashes();
 				let env_info = EnvInfo {
@@ -274,16 +275,24 @@ impl MinerService for Miner {
 					ExecutionError::TransactionMalformed(message)
 				}));
 				let balance = state.balance(&sender);
-				// give the sender max balance
-				state.sub_balance(&sender, &balance);
-				state.add_balance(&sender, &U256::max_value());
-				let options = TransactOptions { tracing: false, vm_tracing: vm_tracing, check_nonce: false };
-
-				// TODO: use vm_trace here.
-				Executive::new(&mut state, &env_info, self.engine(), chain.vm_factory()).transact(t, options)
+				let needed_balance = t.value + t.gas * t.gas_price;
+				if balance < needed_balance {
+					// give the sender a sufficient balance
+					state.add_balance(&sender, &(needed_balance - balance));
+				}
+				let options = TransactOptions { tracing: false, 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);
+
+				// TODO gav move this into Executive.
+				if analytics.state_diffing {
+					if let Ok(ref mut x) = ret {
+						x.state_diff = Some(state.diff_from(block.state().clone()));
+					}
+				}
+				ret
 			},
 			None => {
-				chain.call(t, vm_tracing)
+				chain.call(t, analytics)
 			}
 		}
 	}

ethcore/src/miner/mod.rs

@@ -51,7 +51,7 @@ pub use self::external::{ExternalMiner, ExternalMinerService};
 
 use std::collections::BTreeMap;
 use util::{H256, U256, Address, Bytes};
-use client::{MiningBlockChainClient, Executed};
+use client::{MiningBlockChainClient, Executed, CallAnalytics};
 use block::ClosedBlock;
 use receipt::Receipt;
 use error::{Error, ExecutionError};
@@ -148,7 +148,7 @@ 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, vm_tracing: bool) -> Result<Executed, ExecutionError>;
+	fn call(&self, chain: &MiningBlockChainClient, t: &SignedTransaction, analytics: CallAnalytics) -> Result<Executed, ExecutionError>;
 
 	/// Get storage value in pending state.
 	fn storage_at(&self, chain: &MiningBlockChainClient, address: &Address, position: &H256) -> H256;

ethcore/src/pod_account.rs

@@ -18,6 +18,7 @@ use util::*;
 use account::*;
 use account_db::*;
 use ethjson;
+use types::account_diff::*;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 /// An account, expressed as Plain-Old-Data (hence the name).
@@ -106,17 +107,58 @@ impl fmt::Display for PodAccount {
 	}
 }
 
+/// Determine difference between two optionally existant `Account`s. Returns None
+/// if they are the same.
+pub fn diff_pod(pre: Option<&PodAccount>, post: Option<&PodAccount>) -> Option<AccountDiff> {
+	match (pre, post) {
+		(None, Some(x)) => Some(AccountDiff {
+			balance: Diff::Born(x.balance),
+			nonce: Diff::Born(x.nonce),
+			code: Diff::Born(x.code.clone()),
+			storage: x.storage.iter().map(|(k, v)| (k.clone(), Diff::Born(v.clone()))).collect(),
+		}),
+		(Some(x), None) => Some(AccountDiff {
+			balance: Diff::Died(x.balance),
+			nonce: Diff::Died(x.nonce),
+			code: Diff::Died(x.code.clone()),
+			storage: x.storage.iter().map(|(k, v)| (k.clone(), Diff::Died(v.clone()))).collect(),
+		}),
+		(Some(pre), Some(post)) => {
+			let storage: Vec<_> = pre.storage.keys().merge(post.storage.keys())
+				.filter(|k| pre.storage.get(k).unwrap_or(&H256::new()) != post.storage.get(k).unwrap_or(&H256::new()))
+				.collect();
+			let r = AccountDiff {
+				balance: Diff::new(pre.balance, post.balance),
+				nonce: Diff::new(pre.nonce, post.nonce),
+				code: Diff::new(pre.code.clone(), post.code.clone()),
+				storage: storage.into_iter().map(|k|
+					(k.clone(), Diff::new(
+						pre.storage.get(&k).cloned().unwrap_or_else(H256::new),
+						post.storage.get(&k).cloned().unwrap_or_else(H256::new)
+					))).collect(),
+			};
+			if r.balance.is_same() && r.nonce.is_same() && r.code.is_same() && r.storage.is_empty() {
+				None
+			} else {
+				Some(r)
+			}
+		},
+		_ => None,
+	}
+}
+
+
 #[cfg(test)]
 mod test {
 	use common::*;
-	use account_diff::*;
-	use super::*;
+	use types::account_diff::*;
+	use super::{PodAccount, diff_pod};
 
 	#[test]
 	fn existence() {
 		let a = PodAccount{balance: 69.into(), nonce: 0.into(), code: vec![], storage: map![]};
-		assert_eq!(AccountDiff::diff_pod(Some(&a), Some(&a)), None);
-		assert_eq!(AccountDiff::diff_pod(None, Some(&a)), Some(AccountDiff{
+		assert_eq!(diff_pod(Some(&a), Some(&a)), None);
+		assert_eq!(diff_pod(None, Some(&a)), Some(AccountDiff{
 			balance: Diff::Born(69.into()),
 			nonce: Diff::Born(0.into()),
 			code: Diff::Born(vec![]),
@@ -128,7 +170,7 @@ mod test {
 	fn basic() {
 		let a = PodAccount{balance: 69.into(), nonce: 0.into(), code: vec![], storage: map![]};
 		let b = PodAccount{balance: 42.into(), nonce: 1.into(), code: vec![], storage: map![]};
-		assert_eq!(AccountDiff::diff_pod(Some(&a), Some(&b)), Some(AccountDiff {
+		assert_eq!(diff_pod(Some(&a), Some(&b)), Some(AccountDiff {
 			balance: Diff::Changed(69.into(), 42.into()),
 			nonce: Diff::Changed(0.into(), 1.into()),
 			code: Diff::Same,
@@ -140,7 +182,7 @@ mod test {
 	fn code() {
 		let a = PodAccount{balance: 0.into(), nonce: 0.into(), code: vec![], storage: map![]};
 		let b = PodAccount{balance: 0.into(), nonce: 1.into(), code: vec![0], storage: map![]};
-		assert_eq!(AccountDiff::diff_pod(Some(&a), Some(&b)), Some(AccountDiff {
+		assert_eq!(diff_pod(Some(&a), Some(&b)), Some(AccountDiff {
 			balance: Diff::Same,
 			nonce: Diff::Changed(0.into(), 1.into()),
 			code: Diff::Changed(vec![], vec![0]),
@@ -162,7 +204,7 @@ mod test {
 			code: vec![],
 			storage: map_into![1 => 1, 2 => 3, 3 => 0, 5 => 0, 7 => 7, 8 => 0, 9 => 9]
 		};
-		assert_eq!(AccountDiff::diff_pod(Some(&a), Some(&b)), Some(AccountDiff {
+		assert_eq!(diff_pod(Some(&a), Some(&b)), Some(AccountDiff {
 			balance: Diff::Same,
 			nonce: Diff::Same,
 			code: Diff::Same,