Gas limit ceiling option.

rpc/src/v1/impls/ethcore.rs

@@ -72,6 +72,10 @@ impl<C, M> Ethcore for EthcoreClient<C, M> where M: MinerService + 'static, C: M
 		to_value(&take_weak!(self.miner).gas_floor_target())
 	}
 
+	fn gas_ceil_target(&self, _: Params) -> Result<Value, Error> {
+		to_value(&take_weak!(self.miner).gas_ceil_target())
+	}
+
 	fn dev_logs(&self, _params: Params) -> Result<Value, Error> {
 		let logs = self.logger.logs();
 		to_value(&logs.deref().as_slice())

rpc/src/v1/impls/ethcore_set.rs

@@ -52,8 +52,15 @@ impl<M> EthcoreSet for EthcoreSetClient<M> where M: MinerService + 'static {
 	}
 
 	fn set_gas_floor_target(&self, params: Params) -> Result<Value, Error> {
-		from_params::<(U256,)>(params).and_then(|(gas_floor_target,)| {
-			take_weak!(self.miner).set_gas_floor_target(gas_floor_target);
+		from_params::<(U256,)>(params).and_then(|(target,)| {
+			take_weak!(self.miner).set_gas_floor_target(target);
+			to_value(&true)
+		})
+	}
+
+	fn set_gas_ceil_target(&self, params: Params) -> Result<Value, Error> {
+		from_params::<(U256,)>(params).and_then(|(target,)| {
+			take_weak!(self.miner).set_gas_ceil_target(target);
 			to_value(&true)
 		})
 	}

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

@@ -39,7 +39,7 @@ pub struct TestMinerService {
 	pub last_nonces: RwLock<HashMap<Address, U256>>,
 
 	min_gas_price: RwLock<U256>,
-	gas_floor_target: RwLock<U256>,
+	gas_range_target: RwLock<(U256, U256)>,
 	author: RwLock<Address>,
 	extra_data: RwLock<Bytes>,
 	limit: RwLock<usize>,
@@ -54,7 +54,7 @@ impl Default for TestMinerService {
 			pending_receipts: Mutex::new(BTreeMap::new()),
 			last_nonces: RwLock::new(HashMap::new()),
 			min_gas_price: RwLock::new(U256::from(20_000_000)),
-			gas_floor_target: RwLock::new(U256::from(12345)),
+			gas_range_target: RwLock::new((U256::from(12345), U256::from(54321))),
 			author: RwLock::new(Address::zero()),
 			extra_data: RwLock::new(vec![1, 2, 3, 4]),
 			limit: RwLock::new(1024),
@@ -81,9 +81,14 @@ impl MinerService for TestMinerService {
 		*self.extra_data.write().unwrap() = extra_data;
 	}
 
-	/// Set the gas limit we wish to target when sealing a new block.
+	/// Set the lower gas limit we wish to target when sealing a new block.
 	fn set_gas_floor_target(&self, target: U256) {
-		*self.gas_floor_target.write().unwrap() = target;
+		self.gas_range_target.write().unwrap().0 = target;
+	}
+
+	/// Set the upper gas limit we wish to target when sealing a new block.
+	fn set_gas_ceil_target(&self, target: U256) {
+		self.gas_range_target.write().unwrap().1 = target;
 	}
 
 	fn set_minimal_gas_price(&self, min_gas_price: U256) {
@@ -111,7 +116,11 @@ impl MinerService for TestMinerService {
 	}
 
 	fn gas_floor_target(&self) -> U256 {
-		*self.gas_floor_target.read().unwrap()
+		self.gas_range_target.read().unwrap().0
+	}
+
+	fn gas_ceil_target(&self) -> U256 {
+		self.gas_range_target.read().unwrap().1
 	}
 
 	/// Imports transactions to transaction queue.

rpc/src/v1/traits/ethcore.rs

@@ -30,6 +30,9 @@ pub trait Ethcore: Sized + Send + Sync + 'static {
 	/// Returns mining gas floor target.
 	fn gas_floor_target(&self, _: Params) -> Result<Value, Error>;
 
+	/// Returns mining gas floor cap.
+	fn gas_ceil_target(&self, _: Params) -> Result<Value, Error>;
+
 	/// Returns minimal gas price for transaction to be included in queue.
 	fn min_gas_price(&self, _: Params) -> Result<Value, Error>;
 
@@ -70,6 +73,7 @@ pub trait Ethcore: Sized + Send + Sync + 'static {
 
 		delegate.add_method("ethcore_extraData", Ethcore::extra_data);
 		delegate.add_method("ethcore_gasFloorTarget", Ethcore::gas_floor_target);
+		delegate.add_method("ethcore_gasCeilTarget", Ethcore::gas_ceil_target);
 		delegate.add_method("ethcore_minGasPrice", Ethcore::min_gas_price);
 		delegate.add_method("ethcore_transactionsLimit", Ethcore::transactions_limit);
 		delegate.add_method("ethcore_devLogs", Ethcore::dev_logs);

rpc/src/v1/traits/ethcore_set.rs

@@ -28,6 +28,9 @@ pub trait EthcoreSet: Sized + Send + Sync + 'static {
 	/// Sets new gas floor target for mined blocks.
 	fn set_gas_floor_target(&self, _: Params) -> Result<Value, Error>;
 
+	/// Sets new gas ceiling target for mined blocks.
+	fn set_gas_ceil_target(&self, _: Params) -> Result<Value, Error>;
+
 	/// Sets new extra data for mined blocks.
 	fn set_extra_data(&self, _: Params) -> Result<Value, Error>;
 
@@ -54,6 +57,7 @@ pub trait EthcoreSet: Sized + Send + Sync + 'static {
 		let mut delegate = IoDelegate::new(Arc::new(self));
 		delegate.add_method("ethcore_setMinGasPrice", EthcoreSet::set_min_gas_price);
 		delegate.add_method("ethcore_setGasFloorTarget", EthcoreSet::set_gas_floor_target);
+		delegate.add_method("ethcore_setGasCeilTarget", EthcoreSet::set_gas_ceil_target);
 		delegate.add_method("ethcore_setExtraData", EthcoreSet::set_extra_data);
 		delegate.add_method("ethcore_setAuthor", EthcoreSet::set_author);
 		delegate.add_method("ethcore_setTransactionsLimit", EthcoreSet::set_transactions_limit);