Merge pull request #1460 from ethcore/miner-improvements

Allow configuration of when to reseal blocks.

ethcore/src/client/client.rs

@@ -158,7 +158,8 @@ impl<V> Client<V> where V: Verifier {
 		let mut state_db = journaldb::new(
 			&append_path(&path, "state"),
 			config.pruning,
-			state_db_config);
+			state_db_config
+		);
 
 		if state_db.is_empty() && spec.ensure_db_good(state_db.as_hashdb_mut()) {
 			state_db.commit(0, &spec.genesis_header().hash(), None).expect("Error commiting genesis state to state DB");
@@ -800,8 +801,8 @@ impl<V> BlockChainClient for Client<V> where V: Verifier {
 		}
 	}
 
-	fn all_transactions(&self) -> Vec<SignedTransaction> {
+	fn pending_transactions(&self) -> Vec<SignedTransaction> {
-		self.miner.all_transactions()
+		self.miner.pending_transactions()
 	}
 }
 

ethcore/src/client/mod.rs

@@ -197,7 +197,7 @@ pub trait BlockChainClient : Sync + Send {
 	fn queue_transactions(&self, transactions: Vec<Bytes>);
 
 	/// list all transactions
-	fn all_transactions(&self) -> Vec<SignedTransaction>;
+	fn pending_transactions(&self) -> Vec<SignedTransaction>;
 
 	/// Get the gas price distribution.
 	fn gas_price_statistics(&self, sample_size: usize, distribution_size: usize) -> Result<Vec<U256>, ()> {

ethcore/src/client/test_client.rs

@@ -500,7 +500,7 @@ impl BlockChainClient for TestBlockChainClient {
 		self.import_transactions(tx);
 	}
 
-	fn all_transactions(&self) -> Vec<SignedTransaction> {
+	fn pending_transactions(&self) -> Vec<SignedTransaction> {
-		self.miner.all_transactions()
+		self.miner.pending_transactions()
 	}
 }

ethcore/src/miner/miner.rs

@@ -29,6 +29,48 @@ use spec::Spec;
 use engine::Engine;
 use miner::{MinerService, MinerStatus, TransactionQueue, AccountDetails, TransactionImportResult, TransactionOrigin};
 
+/// Different possible definitions for pending transaction set.
+#[derive(Debug)]
+pub enum PendingSet {
+	/// Always just the transactions in the queue. These have had only cheap checks.
+	AlwaysQueue,
+	/// Always just the transactions in the sealing block. These have had full checks but
+	/// may be empty if the node is not actively mining or has force_sealing enabled.
+	AlwaysSealing,
+	/// Try the sealing block, but if it is not currently sealing, fallback to the queue.
+	SealingOrElseQueue,
+}
+
+/// Configures the behaviour of the miner.
+#[derive(Debug)]
+pub struct MinerOptions {
+	/// Force the miner to reseal, even when nobody has asked for work.
+	pub force_sealing: bool,
+	/// Reseal on receipt of new external transactions.
+	pub reseal_on_external_tx: bool,
+	/// Reseal on receipt of new local transactions.
+	pub reseal_on_own_tx: bool,
+	/// Maximum amount of gas to bother considering for block insertion.
+	pub tx_gas_limit: U256,
+	/// Maximum size of the transaction queue.
+	pub tx_queue_size: usize,
+	/// Whether we should fallback to providing all the queue's transactions or just pending.
+	pub pending_set: PendingSet,
+}
+
+impl Default for MinerOptions {
+	fn default() -> Self {
+		MinerOptions {
+			force_sealing: false,
+			reseal_on_external_tx: true,
+			reseal_on_own_tx: true,
+			tx_gas_limit: !U256::zero(),
+			tx_queue_size: 1024,
+			pending_set: PendingSet::AlwaysQueue,
+		}
+	}
+}
+
 /// Keeps track of transactions using priority queue and holds currently mined block.
 pub struct Miner {
 	// NOTE [ToDr]  When locking always lock in this order!
@@ -36,7 +78,7 @@ pub struct Miner {
 	sealing_work: Mutex<UsingQueue<ClosedBlock>>,
 
 	// for sealing...
-	force_sealing: bool,
+	options: MinerOptions,
 	sealing_enabled: AtomicBool,
 	sealing_block_last_request: Mutex<u64>,
 	gas_range_target: RwLock<(U256, U256)>,
@@ -52,7 +94,7 @@ impl Miner {
 	pub fn with_spec(spec: Spec) -> Miner {
 		Miner {
 			transaction_queue: Mutex::new(TransactionQueue::new()),
-			force_sealing: false,
+			options: Default::default(),
 			sealing_enabled: AtomicBool::new(false),
 			sealing_block_last_request: Mutex::new(0),
 			sealing_work: Mutex::new(UsingQueue::new(5)),
@@ -65,11 +107,11 @@ impl Miner {
 	}
 
 	/// Creates new instance of miner
-	pub fn new(force_sealing: bool, spec: Spec, accounts: Option<Arc<AccountProvider>>) -> Arc<Miner> {
+	pub fn new(options: MinerOptions, spec: Spec, accounts: Option<Arc<AccountProvider>>) -> Arc<Miner> {
 		Arc::new(Miner {
-			transaction_queue: Mutex::new(TransactionQueue::new()),
+			transaction_queue: Mutex::new(TransactionQueue::with_limits(options.tx_queue_size, options.tx_gas_limit)),
-			force_sealing: force_sealing,
+			sealing_enabled: AtomicBool::new(options.force_sealing),
-			sealing_enabled: AtomicBool::new(force_sealing),
+			options: options,
 			sealing_block_last_request: Mutex::new(0),
 			sealing_work: Mutex::new(UsingQueue::new(5)),
 			gas_range_target: RwLock::new((U256::zero(), U256::zero())),
@@ -356,6 +398,10 @@ impl MinerService for Miner {
 		self.transaction_queue.lock().unwrap().set_limit(limit)
 	}
 
+	fn set_tx_gas_limit(&self, limit: U256) {
+		self.transaction_queue.lock().unwrap().set_tx_gas_limit(limit)
+	}
+
 	/// Get the author that we will seal blocks as.
 	fn author(&self) -> Address {
 		*self.author.read().unwrap()
@@ -385,7 +431,7 @@ impl MinerService for Miner {
 				.map(|tx| transaction_queue.add(tx, &fetch_account, TransactionOrigin::External))
 				.collect()
 		};
-		if !results.is_empty() {
+		if !results.is_empty() && self.options.reseal_on_external_tx {
 			self.update_sealing(chain);
 		}
 		results
@@ -420,7 +466,7 @@ impl MinerService for Miner {
 			import
 		};
 
-		if imported.is_ok() {
+		if imported.is_ok() && self.options.reseal_on_own_tx {
 			// Make sure to do it after transaction is imported and lock is droped.
 			// We need to create pending block and enable sealing
 			let prepared = self.enable_and_prepare_sealing(chain);
@@ -434,26 +480,6 @@ impl MinerService for Miner {
 		imported
 	}
 
-	fn pending_transactions_hashes(&self) -> Vec<H256> {
-		let queue = self.transaction_queue.lock().unwrap();
-		match (self.sealing_enabled.load(atomic::Ordering::Relaxed), self.sealing_work.lock().unwrap().peek_last_ref()) {
-			(true, Some(pending)) => pending.transactions().iter().map(|t| t.hash()).collect(),
-			_ => {
-				queue.pending_hashes()
-			}
-		}
-	}
-
-	fn transaction(&self, hash: &H256) -> Option<SignedTransaction> {
-		let queue = self.transaction_queue.lock().unwrap();
-		match (self.sealing_enabled.load(atomic::Ordering::Relaxed), self.sealing_work.lock().unwrap().peek_last_ref()) {
-			(true, Some(pending)) => pending.transactions().iter().find(|t| &t.hash() == hash).cloned(),
-			_ => {
-				queue.find(hash)
-			}
-		}
-	}
-
 	fn all_transactions(&self) -> Vec<SignedTransaction> {
 		let queue = self.transaction_queue.lock().unwrap();
 		queue.top_transactions()
@@ -461,13 +487,42 @@ impl MinerService for Miner {
 
 	fn pending_transactions(&self) -> Vec<SignedTransaction> {
 		let queue = self.transaction_queue.lock().unwrap();
+		let sw = self.sealing_work.lock().unwrap();
 		// TODO: should only use the sealing_work when it's current (it could be an old block)
-		match (self.sealing_enabled.load(atomic::Ordering::Relaxed), self.sealing_work.lock().unwrap().peek_last_ref()) {
+		let sealing_set = match self.sealing_enabled.load(atomic::Ordering::Relaxed) {
-			(true, Some(pending)) => pending.transactions().clone(),
+			true => sw.peek_last_ref(),
-			_ => {
+			false => None,
-				queue.top_transactions()
+		};
+		match (&self.options.pending_set, sealing_set) {
+			(&PendingSet::AlwaysQueue, _) | (&PendingSet::SealingOrElseQueue, None) => queue.top_transactions(),
+			(_, sealing) => sealing.map_or_else(Vec::new, |s| s.transactions().clone()),
 		}
 	}
+
+	fn pending_transactions_hashes(&self) -> Vec<H256> {
+		let queue = self.transaction_queue.lock().unwrap();
+		let sw = self.sealing_work.lock().unwrap();
+		let sealing_set = match self.sealing_enabled.load(atomic::Ordering::Relaxed) {
+			true => sw.peek_last_ref(),
+			false => None,
+		};
+		match (&self.options.pending_set, sealing_set) {
+			(&PendingSet::AlwaysQueue, _) | (&PendingSet::SealingOrElseQueue, None) => queue.pending_hashes(),
+			(_, sealing) => sealing.map_or_else(Vec::new, |s| s.transactions().iter().map(|t| t.hash()).collect()),
+		}
+	}
+
+	fn transaction(&self, hash: &H256) -> Option<SignedTransaction> {
+		let queue = self.transaction_queue.lock().unwrap();
+		let sw = self.sealing_work.lock().unwrap();
+		let sealing_set = match self.sealing_enabled.load(atomic::Ordering::Relaxed) {
+			true => sw.peek_last_ref(),
+			false => None,
+		};
+		match (&self.options.pending_set, sealing_set) {
+			(&PendingSet::AlwaysQueue, _) | (&PendingSet::SealingOrElseQueue, None) => queue.find(hash),
+			(_, sealing) => sealing.and_then(|s| s.transactions().iter().find(|t| &t.hash() == hash).cloned()),
+		}
 	}
 
 	fn pending_receipts(&self) -> BTreeMap<H256, Receipt> {
@@ -494,7 +549,7 @@ impl MinerService for Miner {
 			let current_no = chain.chain_info().best_block_number;
 			let has_local_transactions = self.transaction_queue.lock().unwrap().has_local_pending_transactions();
 			let last_request = *self.sealing_block_last_request.lock().unwrap();
-			let should_disable_sealing = !self.force_sealing
+			let should_disable_sealing = !self.options.force_sealing
 				&& !has_local_transactions
 				&& current_no > last_request
 				&& current_no - last_request > SEALING_TIMEOUT_IN_BLOCKS;

ethcore/src/miner/mod.rs

@@ -47,7 +47,7 @@ mod external;
 mod transaction_queue;
 
 pub use self::transaction_queue::{TransactionQueue, AccountDetails, TransactionImportResult, TransactionOrigin};
-pub use self::miner::{Miner};
+pub use self::miner::{Miner, MinerOptions, PendingSet};
 pub use self::external::{ExternalMiner, ExternalMinerService};
 
 use std::collections::BTreeMap;
@@ -101,6 +101,9 @@ pub trait MinerService : Send + Sync {
 	/// Set maximal number of transactions kept in the queue (both current and future).
 	fn set_transactions_limit(&self, limit: usize);
 
+	/// Set maximum amount of gas allowed for any single transaction to mine.
+	fn set_tx_gas_limit(&self, limit: U256);
+
 	/// Imports transactions to transaction queue.
 	fn import_transactions<T>(&self, chain: &MiningBlockChainClient, transactions: Vec<SignedTransaction>, fetch_account: T) ->
 		Vec<Result<TransactionImportResult, Error>>

ethcore/src/miner/transaction_queue.rs

@@ -334,6 +334,8 @@ const GAS_LIMIT_HYSTERESIS: usize = 10; // %
 pub struct TransactionQueue {
 	/// Gas Price threshold for transactions that can be imported to this queue (defaults to 0)
 	minimal_gas_price: U256,
+	/// The maximum amount of gas any individual transaction may use.
+	tx_gas_limit: U256,
 	/// Current gas limit (block gas limit * factor). Transactions above the limit will not be accepted (default to !0)
 	gas_limit: U256,
 	/// Priority queue for transactions that can go to block
@@ -355,11 +357,11 @@ impl Default for TransactionQueue {
 impl TransactionQueue {
 	/// Creates new instance of this Queue
 	pub fn new() -> Self {
-		Self::with_limit(1024)
+		Self::with_limits(1024, !U256::zero())
 	}
 
 	/// Create new instance of this Queue with specified limits
-	pub fn with_limit(limit: usize) -> Self {
+	pub fn with_limits(limit: usize, tx_gas_limit: U256) -> Self {
 		let current = TransactionSet {
 			by_priority: BTreeSet::new(),
 			by_address: Table::new(),
@@ -374,6 +376,7 @@ impl TransactionQueue {
 
 		TransactionQueue {
 			minimal_gas_price: U256::zero(),
+			tx_gas_limit: tx_gas_limit,
 			gas_limit: !U256::zero(),
 			current: current,
 			future: future,
@@ -418,6 +421,12 @@ impl TransactionQueue {
 		};
 	}
 
+	/// Set the new limit for the amount of gas any individual transaction may have.
+	/// Any transaction already imported to the queue is not affected.
+	pub fn set_tx_gas_limit(&mut self, limit: U256) {
+		self.tx_gas_limit = limit;
+	}
+
 	/// Returns current status for this queue
 	pub fn status(&self) -> TransactionQueueStatus {
 		TransactionQueueStatus {
@@ -435,7 +444,9 @@ impl TransactionQueue {
 		if tx.gas_price < self.minimal_gas_price {
 			trace!(target: "miner",
 				"Dropping transaction below minimal gas price threshold: {:?} (gp: {} < {})",
-				tx.hash(), tx.gas_price, self.minimal_gas_price
+				tx.hash(),
+				tx.gas_price,
+				self.minimal_gas_price
 			);
 
 			return Err(Error::Transaction(TransactionError::InsufficientGasPrice {
@@ -446,10 +457,13 @@ impl TransactionQueue {
 
 		try!(tx.check_low_s());
 
-		if tx.gas > self.gas_limit {
+		if tx.gas > self.gas_limit || tx.gas > self.tx_gas_limit {
 			trace!(target: "miner",
-				"Dropping transaction above gas limit: {:?} ({} > {})",
+				"Dropping transaction above gas limit: {:?} ({} > min({}, {}))",
-				tx.hash(), tx.gas, self.gas_limit
+				tx.hash(),
+				tx.gas,
+				self.gas_limit,
+				self.tx_gas_limit
 			);
 
 			return Err(Error::Transaction(TransactionError::GasLimitExceeded {
@@ -463,8 +477,13 @@ impl TransactionQueue {
 
 		let cost = vtx.transaction.value + vtx.transaction.gas_price * vtx.transaction.gas;
 		if client_account.balance < cost {
-			trace!(target: "miner", "Dropping transaction without sufficient balance: {:?} ({} < {})",
+			trace!(target: "miner",
-				vtx.hash(), client_account.balance, cost);
+				"Dropping transaction without sufficient balance: {:?} ({} < {})",
+				vtx.hash(),
+				client_account.balance,
+				cost
+			);
+
 			return Err(Error::Transaction(TransactionError::InsufficientBalance {
 				cost: cost,
 				balance: client_account.balance
@@ -1288,7 +1307,7 @@ mod test {
 	#[test]
 	fn should_drop_old_transactions_when_hitting_the_limit() {
 		// given
-		let mut txq = TransactionQueue::with_limit(1);
+		let mut txq = TransactionQueue::with_limits(1, !U256::zero());
 		let (tx, tx2) = new_txs(U256::one());
 		let sender = tx.sender().unwrap();
 		let nonce = tx.nonce;
@@ -1310,7 +1329,7 @@ mod test {
 	#[test]
 	fn should_return_correct_nonces_when_dropped_because_of_limit() {
 		// given
-		let mut txq = TransactionQueue::with_limit(2);
+		let mut txq = TransactionQueue::with_limits(2, !U256::zero());
 		let tx = new_tx();
 		let (tx1, tx2) = new_txs(U256::one());
 		let sender = tx1.sender().unwrap();
@@ -1331,7 +1350,7 @@ mod test {
 
 	#[test]
 	fn should_limit_future_transactions() {
-		let mut txq = TransactionQueue::with_limit(1);
+		let mut txq = TransactionQueue::with_limits(1, !U256::zero());
 		txq.current.set_limit(10);
 		let (tx1, tx2) = new_txs_with_gas_price_diff(U256::from(4), U256::from(1));
 		let (tx3, tx4) = new_txs_with_gas_price_diff(U256::from(4), U256::from(2));
@@ -1591,7 +1610,7 @@ mod test {
 	#[test]
 	fn should_keep_right_order_in_future() {
 		// given
-		let mut txq = TransactionQueue::with_limit(1);
+		let mut txq = TransactionQueue::with_limits(1, !U256::zero());
 		let (tx1, tx2) = new_txs(U256::from(1));
 		let prev_nonce = |a: &Address| AccountDetails { nonce: default_nonce(a).nonce - U256::one(), balance:
 			default_nonce(a).balance };

parity/cli.rs

@@ -133,6 +133,22 @@ Sealing/Mining Options:
                            NOTE: MINING WILL NOT WORK WITHOUT THIS OPTION.
   --force-sealing          Force the node to author new blocks as if it were
                            always sealing/mining.
+  --reseal-on-txs SET      Specify which transactions should force the node
+                           to reseal a block. SET is one of:
+                           none - never reseal on new transactions;
+                           own - reseal only on a new local transaction;
+                           ext - reseal only on a new external transaction;
+                           all - reseal on all new transactions [default: all].
+  --tx-gas-limit GAS       Apply a limit of GAS as the maximum amount of gas
+                           a single transaction may have for it to be mined.
+  --relay-set SET          Set of transactions to relay. SET may be:
+                           cheap - Relay any transaction in the queue (this
+                           may include invalid transactions);
+                           strict - Relay only executed transactions (this
+                           guarantees we don't relay invalid transactions, but
+                           means we relay nothing if not mining);
+                           lenient - Same as strict when mining, and cheap
+                           when not [default: cheap].
   --usd-per-tx USD         Amount of USD to be paid for a basic transaction
                            [default: 0.005]. The minimum gas price is set
                            accordingly.
@@ -146,8 +162,8 @@ Sealing/Mining Options:
                            block due to transaction volume [default: 3141592].
   --extra-data STRING      Specify a custom extra-data for authored blocks, no
                            more than 32 characters.
-  --tx-limit LIMIT         Limit of transactions kept in the queue (waiting to
+  --tx-queue-size LIMIT    Maximum amount of transactions in the queue (waiting
-                           be included in next block) [default: 1024].
+                           to be included in next block) [default: 1024].
 
 Footprint Options:
   --tracing BOOL           Indicates if full transaction tracing should be
@@ -288,13 +304,16 @@ pub struct Args {
 	pub flag_signer_path: String,
 	pub flag_no_token: bool,
 	pub flag_force_sealing: bool,
+	pub flag_reseal_on_txs: String,
+	pub flag_tx_gas_limit: Option<String>,
+	pub flag_relay_set: String,
 	pub flag_author: Option<String>,
 	pub flag_usd_per_tx: String,
 	pub flag_usd_per_eth: String,
 	pub flag_gas_floor_target: String,
 	pub flag_gas_cap: String,
 	pub flag_extra_data: Option<String>,
-	pub flag_tx_limit: usize,
+	pub flag_tx_queue_size: usize,
 	pub flag_logging: Option<String>,
 	pub flag_version: bool,
 	pub flag_from: String,

parity/configuration.rs

@@ -27,6 +27,7 @@ use util::*;
 use ethcore::account_provider::AccountProvider;
 use util::network_settings::NetworkSettings;
 use ethcore::client::{append_path, get_db_path, ClientConfig, DatabaseCompactionProfile, Switch, VMType};
+use ethcore::miner::{MinerOptions, PendingSet};
 use ethcore::ethereum;
 use ethcore::spec::Spec;
 use ethsync::SyncConfig;
@@ -67,6 +68,37 @@ impl Configuration {
 		self.args.flag_maxpeers.unwrap_or(self.args.flag_peers) as u32
 	}
 
+	fn decode_u256(d: &str, argument: &str) -> U256 {
+		U256::from_dec_str(d).unwrap_or_else(|_|
+			U256::from_str(clean_0x(d)).unwrap_or_else(|_|
+				die!("{}: Invalid numeric value for {}. Must be either a decimal or a hex number.", d, argument)
+			)
+		)
+	}
+
+	pub fn miner_options(&self) -> MinerOptions {
+		let (own, ext) = match self.args.flag_reseal_on_txs.as_str() {
+			"none" => (false, false),
+			"own" => (true, false),
+			"ext" => (false, true),
+			"all" => (true, true),
+			x => die!("{}: Invalid value for --reseal option. Use --help for more information.", x)
+		};
+		MinerOptions {
+			force_sealing: self.args.flag_force_sealing,
+			reseal_on_external_tx: ext,
+			reseal_on_own_tx: own,
+			tx_gas_limit: self.args.flag_tx_gas_limit.as_ref().map_or(!U256::zero(), |d| Self::decode_u256(d, "--tx-gas-limit")),
+			tx_queue_size: self.args.flag_tx_queue_size,
+			pending_set: match self.args.flag_relay_set.as_str() {
+				"cheap" => PendingSet::AlwaysQueue,
+				"strict" => PendingSet::AlwaysSealing,
+				"lenient" => PendingSet::SealingOrElseQueue,
+				x => die!("{}: Invalid value for --relay-set option. Use --help for more information.", x)
+			},
+		}
+	}
+
 	pub fn author(&self) -> Option<Address> {
 		self.args.flag_etherbase.as_ref()
 			.or(self.args.flag_author.as_ref())

parity/main.rs

@@ -208,13 +208,13 @@ fn execute_client(conf: Configuration, spec: Spec, client_config: ClientConfig)
 	let account_service = Arc::new(conf.account_service());
 
 	// Miner
-	let miner = Miner::new(conf.args.flag_force_sealing, conf.spec(), Some(account_service.clone()));
+	let miner = Miner::new(conf.miner_options(), conf.spec(), Some(account_service.clone()));
 	miner.set_author(conf.author().unwrap_or_default());
 	miner.set_gas_floor_target(conf.gas_floor_target());
 	miner.set_gas_ceil_target(conf.gas_ceil_target());
 	miner.set_extra_data(conf.extra_data());
 	miner.set_minimal_gas_price(conf.gas_price());
-	miner.set_transactions_limit(conf.args.flag_tx_limit);
+	miner.set_transactions_limit(conf.args.flag_tx_queue_size);
 
 	// Build client
 	let mut service = ClientService::start(

rpc/src/v1/impls/ethcore_set.rs

@@ -22,7 +22,7 @@ use jsonrpc_core::*;
 use ethcore::miner::MinerService;
 use ethcore::service::SyncMessage;
 use v1::traits::EthcoreSet;
-use v1::types::{Bytes};
+use v1::types::Bytes;
 
 /// Ethcore-specific rpc interface for operations altering the settings.
 pub struct EthcoreSetClient<M> where
@@ -86,6 +86,13 @@ impl<M> EthcoreSet for EthcoreSetClient<M> where M: MinerService + 'static {
 		})
 	}
 
+	fn set_tx_gas_limit(&self, params: Params) -> Result<Value, Error> {
+		from_params::<(U256,)>(params).and_then(|(limit,)| {
+			take_weak!(self.miner).set_tx_gas_limit(limit.into());
+			to_value(&true)
+		})
+	}
+
 	fn add_reserved_peer(&self, params: Params) -> Result<Value, Error> {
 		from_params::<(String,)>(params).and_then(|(peer,)| {
 			match take_weak!(self.net).add_reserved_peer(&peer) {

rpc/src/v1/tests/eth.rs

@@ -24,12 +24,12 @@ use ethcore::spec::{Genesis, Spec};
 use ethcore::block::Block;
 use ethcore::views::BlockView;
 use ethcore::ethereum;
-use ethcore::miner::{MinerService, ExternalMiner, Miner};
+use ethcore::miner::{MinerOptions, MinerService, ExternalMiner, Miner, PendingSet};
 use ethcore::account_provider::AccountProvider;
 use devtools::RandomTempPath;
 use util::Hashable;
 use util::io::IoChannel;
-use util::{U256, H256};
+use util::{U256, H256, Uint};
 use jsonrpc_core::IoHandler;
 use ethjson::blockchain::BlockChain;
 
@@ -49,7 +49,18 @@ fn sync_provider() -> Arc<TestSyncProvider> {
 }
 
 fn miner_service(spec: Spec, accounts: Arc<AccountProvider>) -> Arc<Miner> {
-	Miner::new(true, spec, Some(accounts))
+	Miner::new(
+		MinerOptions {
+			force_sealing: true,
+			reseal_on_external_tx: true,
+			reseal_on_own_tx: true,
+			tx_queue_size: 1024,
+			tx_gas_limit: !U256::zero(),
+			pending_set: PendingSet::SealingOrElseQueue,
+		},
+		spec,
+		Some(accounts)
+	)
 }
 
 fn make_spec(chain: &BlockChain) -> Spec {

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

@@ -43,6 +43,7 @@ pub struct TestMinerService {
 	author: RwLock<Address>,
 	extra_data: RwLock<Bytes>,
 	limit: RwLock<usize>,
+	tx_gas_limit: RwLock<U256>,
 }
 
 impl Default for TestMinerService {
@@ -58,6 +59,7 @@ impl Default for TestMinerService {
 			author: RwLock::new(Address::zero()),
 			extra_data: RwLock::new(vec![1, 2, 3, 4]),
 			limit: RwLock::new(1024),
+			tx_gas_limit: RwLock::new(!U256::zero()),
 		}
 	}
 }
@@ -99,6 +101,10 @@ impl MinerService for TestMinerService {
 		*self.limit.write().unwrap() = limit;
 	}
 
+	fn set_tx_gas_limit(&self, limit: U256) {
+		*self.tx_gas_limit.write().unwrap() = limit;
+	}
+
 	fn transactions_limit(&self) -> usize {
 		*self.limit.read().unwrap()
 	}

rpc/src/v1/traits/ethcore_set.rs

@@ -40,6 +40,9 @@ pub trait EthcoreSet: Sized + Send + Sync + 'static {
 	/// Sets the limits for transaction queue.
 	fn set_transactions_limit(&self, _: Params) -> Result<Value, Error>;
 
+	/// Sets the maximum amount of gas a single transaction may consume.
+	fn set_tx_gas_limit(&self, _: Params) -> Result<Value, Error>;
+
 	/// Add a reserved peer.
 	fn add_reserved_peer(&self, _: Params) -> Result<Value, Error>;
 
@@ -60,6 +63,7 @@ pub trait EthcoreSet: Sized + Send + Sync + 'static {
 		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_setMaxTransactionGas", EthcoreSet::set_tx_gas_limit);
 		delegate.add_method("ethcore_setTransactionsLimit", EthcoreSet::set_transactions_limit);
 		delegate.add_method("ethcore_addReservedPeer", EthcoreSet::add_reserved_peer);
 		delegate.add_method("ethcore_removeReservedPeer", EthcoreSet::remove_reserved_peer);

rpc/src/v1/types/optionals.rs

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-use serde::{Serialize, Serializer};
+use serde::{Serialize, Serializer, Deserialize, Deserializer};
 use serde_json::Value;
 
 /// Optional value
@@ -26,13 +26,22 @@ pub enum OptionalValue<T> where T: Serialize {
 	Null
 }
 
-impl<T> Default for OptionalValue<T> where T: Serialize {
+impl<T> Default for OptionalValue<T> where T: Serialize + Deserialize {
 	fn default() -> Self {
 		OptionalValue::Null
 	}
 }
 
-impl<T> Serialize for OptionalValue<T> where T: Serialize {
+impl<T> Into<Option<T>> for OptionalValue<T> where T: Serialize + Deserialize {
+	fn into(self) -> Option<T> {
+		match self {
+			OptionalValue::Null => None,
+			OptionalValue::Value(t) => Some(t),
+		}
+	}
+}
+
+impl<T> Serialize for OptionalValue<T> where T: Serialize + Deserialize {
 	fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
 	where S: Serializer {
 		match *self {
@@ -42,6 +51,17 @@ impl<T> Serialize for OptionalValue<T> where T: Serialize {
 	}
 }
 
+impl<T> Deserialize for OptionalValue<T> where T: Serialize + Deserialize {
+	fn deserialize<D>(deserializer: &mut D) -> Result<OptionalValue<T>, D::Error>
+	where D: Deserializer {
+		let deser_result: Result<T, D::Error> = Deserialize::deserialize(deserializer);
+		match deser_result {
+			Ok(t) => Ok(OptionalValue::Value(t)),
+			Err(_) => Ok(OptionalValue::Null),
+		}
+	}
+}
+
 #[cfg(test)]
 mod tests {
 	use serde_json;

sync/src/chain.rs

@@ -1314,7 +1314,7 @@ impl ChainSync {
 			return 0;
 		}
 
-		let mut transactions = io.chain().all_transactions();
+		let mut transactions = io.chain().pending_transactions();
 		if transactions.is_empty() {
 			return 0;
 		}

sync/src/lib.rs

@@ -44,7 +44,7 @@
 //! 	let mut service = NetworkService::new(NetworkConfiguration::new()).unwrap();
 //! 	service.start().unwrap();
 //! 	let dir = env::temp_dir();
-//! 	let miner = Miner::new(false, ethereum::new_frontier(true), None);
+//! 	let miner = Miner::new(Default::default(), ethereum::new_frontier(true), None);
 //! 	let client = Client::new(
 //!			ClientConfig::default(),
 //!			ethereum::new_frontier(true),