State::new_contract.

src/account.rs

@@ -70,8 +70,15 @@ impl Account {
 		}
 	}
 
+	/// Reset this account to the status of a not-yet-initialised contract.
+	/// NOTE: Account should have `init_code()` called on it later.
+	pub fn reset_code(&mut self) {
+		self.code_hash = None;
+		self.code_cache = vec![];
+	}
+
 	/// Set this account's code to the given code.
-	/// NOTE: Account should have been created with `new_contract`.
+	/// NOTE: Account should have been created with `new_contract()` or have `reset_code()` called on it.
 	pub fn init_code(&mut self, code: Bytes) {
 		assert!(self.code_hash.is_none());
 		self.code_cache = code;

src/ethash.rs

@@ -36,5 +36,5 @@ fn playpen() {
 	let genesis_header = engine.spec().genesis_header();
 	let mut db = OverlayDB::new_temp();
 	engine.spec().ensure_db_good(&mut db);
-	let b = OpenBlock::new(engine.deref(), db, &genesis_header, vec![genesis_header.hash()]);
+//	let b = OpenBlock::new(engine.deref(), db, &genesis_header, vec![genesis_header.hash()]);
 }

src/spec.rs

@@ -206,15 +206,16 @@ impl Spec {
 		Spec {
 			engine_name: "Ethash".to_string(),
 			engine_params: vec![
-				("block_reward", encode(&(finney() * U256::from(1500u64)))),
+				("blockReward", encode(&(finney() * U256::from(1500u64)))),
-				("maximum_extra_data_size", encode(&U256::from(1024u64))),
+				("frontierCompatibilityModeLimit", encode(&0xffffffffu64)),
-				("account_start_nonce", encode(&U256::from(0u64))),
+				("maximumExtraDataSize", encode(&U256::from(1024u64))),
-				("gas_limit_bounds_divisor", encode(&1024u64)), 
+				("accountStartNonce", encode(&U256::from(0u64))),
-				("minimum_difficulty", encode(&131_072u64)), 
+				("gasLimitBoundsDivisor", encode(&1024u64)), 
-				("difficulty_bound_divisor", encode(&2048u64)), 
+				("minimumDifficulty", encode(&131_072u64)), 
-				("duration_limit", encode(&8u64)), 
+				("difficultyBoundDivisor", encode(&2048u64)), 
-				("min_gas_limit", encode(&125_000u64)), 
+				("durationLimit", encode(&8u64)), 
-				("gas_floor_target", encode(&3_141_592u64)), 
+				("minGasLimit", encode(&125_000u64)), 
+				("gasFloorTarget", encode(&3_141_592u64)), 
 			].into_iter().fold(HashMap::new(), | mut acc, vec | {
 				acc.insert(vec.0.to_string(), vec.1);
 				acc
@@ -244,15 +245,16 @@ impl Spec {
 		Spec {
 			engine_name: "Ethash".to_string(),
 			engine_params: vec![
-				("block_reward", encode(&(ether() * U256::from(5u64)))),
+				("blockReward", encode(&(ether() * U256::from(5u64)))),
-				("maximum_extra_data_size", encode(&U256::from(32u64))),
+				("frontierCompatibilityModeLimit", encode(&0xfffa2990u64)),
-				("account_start_nonce", encode(&U256::from(0u64))),
+				("maximumExtraDataSize", encode(&U256::from(32u64))),
-				("gas_limit_bounds_divisor", encode(&1024u64)), 
+				("accountStartNonce", encode(&U256::from(0u64))),
-				("minimum_difficulty", encode(&131_072u64)), 
+				("gasLimitBoundsDivisor", encode(&1024u64)), 
-				("difficulty_bound_divisor", encode(&2048u64)), 
+				("minimumDifficulty", encode(&131_072u64)), 
-				("duration_limit", encode(&13u64)), 
+				("difficultyBoundDivisor", encode(&2048u64)), 
-				("min_gas_limit", encode(&5000u64)), 
+				("durationLimit", encode(&13u64)), 
-				("gas_floor_target", encode(&3_141_592u64)), 
+				("minGasLimit", encode(&5000u64)), 
+				("gasFloorTarget", encode(&3_141_592u64)), 
 			].into_iter().fold(HashMap::new(), | mut acc, vec | {
 				acc.insert(vec.0.to_string(), vec.1);
 				acc
@@ -282,15 +284,16 @@ impl Spec {
 		Spec {
 			engine_name: "Ethash".to_string(),
 			engine_params: vec![
-				("block_reward", encode(&(ether() * U256::from(5u64)))),
+				("blockReward", encode(&(ether() * U256::from(5u64)))),
-				("maximum_extra_data_size", encode(&U256::from(32u64))),
+				("frontierCompatibilityModeLimit", encode(&0xfffa2990u64)),
-				("account_start_nonce", encode(&(U256::from(1u64) << 20))),
+				("maximumExtraDataSize", encode(&U256::from(32u64))),
-				("gas_limit_bounds_divisor", encode(&1024u64)), 
+				("accountStartNonce", encode(&(U256::from(1u64) << 20))),
-				("minimum_difficulty", encode(&131_072u64)), 
+				("gasLimitBoundsDivisor", encode(&1024u64)), 
-				("difficulty_bound_divisor", encode(&2048u64)), 
+				("minimumDifficulty", encode(&131_072u64)), 
-				("duration_limit", encode(&13u64)), 
+				("difficultyBoundDivisor", encode(&2048u64)), 
-				("min_gas_limit", encode(&5000u64)), 
+				("durationLimit", encode(&13u64)), 
-				("gas_floor_target", encode(&3_141_592u64)), 
+				("minGasLimit", encode(&5000u64)), 
+				("gasFloorTarget", encode(&3_141_592u64)),
 			].into_iter().fold(HashMap::new(), | mut acc, vec | {
 				acc.insert(vec.0.to_string(), vec.1);
 				acc

src/state.rs

@@ -73,6 +73,12 @@ impl State {
 		&mut self.db
 	}
 
+	/// Create a new contract at address `contract`. If there is already an account at the address
+	/// it will have its code reset, ready for `init_code()`.
+	pub fn new_contract(&mut self, contract: &Address) {
+		self.require_or_from(contract, false, || Account::new_contract(U256::from(0u8)), |r| r.reset_code());
+	}
+
 	/// Get the balance of account `a`.
 	pub fn balance(&self, a: &Address) -> U256 {
 		self.get(a, false).as_ref().map(|account| account.balance().clone()).unwrap_or(U256::from(0u8))
@@ -122,7 +128,7 @@ impl State {
 	/// Initialise the code of account `a` so that it is `value` for `key`.
 	/// NOTE: Account should have been created with `new_contract`.
 	pub fn init_code(&mut self, a: &Address, code: Bytes) {
-		self.require_or_from(a, true, || Account::new_contract(U256::from(0u8))).init_code(code);
+		self.require_or_from(a, true, || Account::new_contract(U256::from(0u8)), |_|{}).init_code(code);
 	}
 
 	/// Execute a given transaction.
@@ -188,18 +194,20 @@ impl State {
 	}
 
 	/// Pull account `a` in our cache from the trie DB. `require_code` requires that the code be cached, too.
-	/// `force_create` creates a new, empty basic account if there is not currently an active account.
 	fn require(&self, a: &Address, require_code: bool) -> RefMut<Account> {
-		self.require_or_from(a, require_code, || Account::new_basic(U256::from(0u8), self.account_start_nonce))
+		self.require_or_from(a, require_code, || Account::new_basic(U256::from(0u8), self.account_start_nonce), |_|{})
 	}
 
 	/// Pull account `a` in our cache from the trie DB. `require_code` requires that the code be cached, too.
-	/// `force_create` creates a new, empty basic account if there is not currently an active account.
+	/// If it doesn't exist, make account equal the evaluation of `default`.
-	fn require_or_from<F: FnOnce() -> Account>(&self, a: &Address, require_code: bool, default: F) -> RefMut<Account> {
+	fn require_or_from<F: FnOnce() -> Account, G: FnOnce(&mut Account)>(&self, a: &Address, require_code: bool, default: F, not_default: G) -> RefMut<Account> {
 		self.cache.borrow_mut().entry(a.clone()).or_insert_with(||
 			TrieDB::new(&self.db, &self.root).get(&a).map(|rlp| Account::from_rlp(rlp)));
-		if self.cache.borrow().get(a).unwrap().is_none() {
+		let preexists = self.cache.borrow().get(a).unwrap().is_none();
+		if preexists {
 			self.cache.borrow_mut().insert(a.clone(), Some(default()));
+		} else {
+			not_default(self.cache.borrow_mut().get_mut(a).unwrap().as_mut().unwrap());
 		}
 
 		let b = self.cache.borrow_mut();
@@ -228,7 +236,7 @@ fn code_from_database() {
 	let a = Address::from_str("0000000000000000000000000000000000000000").unwrap();
 	let (r, db) = {
 		let mut s = State::new_temp();
-		s.require_or_from(&a, false, ||Account::new_contract(U256::from(42u32)));
+		s.require_or_from(&a, false, ||Account::new_contract(U256::from(42u32)), |_|{});
 		s.init_code(&a, vec![1, 2, 3]);
 		assert_eq!(s.code(&a), Some([1u8, 2, 3].to_vec()));
 		s.commit();