Merge pull request #640 from ethcore/tx_queue_min_gas

Gas price threshold for transactions

miner/src/miner.rs

@@ -24,7 +24,7 @@ use ethcore::error::*;
 use ethcore::transaction::SignedTransaction;
 use transaction_queue::{TransactionQueue};
 
-/// Miner external API
+/// Miner client API
 pub trait MinerService {
 
 	/// Returns miner's status.
@@ -34,12 +34,6 @@ pub trait MinerService {
 	fn import_transactions<T>(&self, transactions: Vec<SignedTransaction>, fetch_nonce: T)
 		where T: Fn(&Address) -> U256;
 
-	/// Set the author that we will seal blocks as.
-	fn set_author(&self, author: Address);
-
-	/// Set the extra_data that we will seal blocks with.
-	fn set_extra_data(&self, extra_data: Bytes);
-
 	/// Removes all transactions from the queue and restart mining operation.
 	fn clear_and_reset(&self, chain: &BlockChainClient);
 
@@ -103,6 +97,21 @@ impl Miner {
 	fn extra_data(&self) -> Bytes {
 		self.extra_data.read().unwrap().clone()
 	}
+
+	/// Set the author that we will seal blocks as.
+	pub fn set_author(&self, author: Address) {
+		*self.author.write().unwrap() = author;
+	}
+
+	/// Set the extra_data that we will seal blocks with.
+	pub fn set_extra_data(&self, extra_data: Bytes) {
+		*self.extra_data.write().unwrap() = extra_data;
+	}
+
+	/// Set minimal gas price of transaction to be accepted for mining.
+	pub fn set_minimal_gas_price(&self, min_gas_price: U256) {
+		self.transaction_queue.lock().unwrap().set_minimal_gas_price(min_gas_price);
+	}
 }
 
 impl MinerService for Miner {
@@ -126,15 +135,6 @@ impl MinerService for Miner {
 		transaction_queue.add_all(transactions, fetch_nonce);
 	}
 
-	fn set_author(&self, author: Address) {
-		*self.author.write().unwrap() = author;
-	}
-
-
-	fn set_extra_data(&self, extra_data: Bytes) {
-		*self.extra_data.write().unwrap() = extra_data;
-	}
-
 	fn prepare_sealing(&self, chain: &BlockChainClient) {
 		let no_of_transactions = 128;
 		let transactions = self.transaction_queue.lock().unwrap().top_transactions(no_of_transactions);

miner/src/transaction_queue.rs

@@ -159,6 +159,8 @@ pub struct TransactionQueueStatus {
 
 /// TransactionQueue implementation
 pub struct TransactionQueue {
+	/// Gas Price threshold for transactions that can be imported to this queue (defaults to 0)
+	minimal_gas_price: U256,
 	/// Priority queue for transactions that can go to block
 	current: TransactionSet,
 	/// Priority queue for transactions that has been received but are not yet valid to go to block
@@ -189,6 +191,7 @@ impl TransactionQueue {
 		};
 
 		TransactionQueue {
+			minimal_gas_price: U256::zero(),
 			current: current,
 			future: future,
 			by_hash: HashMap::new(),
@@ -196,6 +199,12 @@ impl TransactionQueue {
 		}
 	}
 
+	/// Sets new gas price threshold for incoming transactions.
+	/// Any transactions already imported to the queue are not affected.
+	pub fn set_minimal_gas_price(&mut self, min_gas_price: U256) {
+		self.minimal_gas_price = min_gas_price;
+	}
+
 	/// Returns current status for this queue
 	pub fn status(&self) -> TransactionQueueStatus {
 		TransactionQueueStatus {
@@ -215,6 +224,15 @@ impl TransactionQueue {
 	/// Add signed transaction to queue to be verified and imported
 	pub fn add<T>(&mut self, tx: SignedTransaction, fetch_nonce: &T)
 		where T: Fn(&Address) -> U256 {
+
+		if tx.gas_price < self.minimal_gas_price {
+			trace!(target: "sync",
+				"Dropping transaction below minimal gas price threshold: {:?} (gp: {} < {})",
+				tx.hash(), tx.gas_price, self.minimal_gas_price
+			);
+			return;
+		}
+		// Everything ok - import transaction
 		self.import_tx(VerifiedTransaction::new(tx), fetch_nonce);
 	}
 
@@ -503,6 +521,22 @@ mod test {
 		assert_eq!(stats.pending, 1);
 	}
 
+	#[test]
+	fn should_not_import_transaction_below_min_gas_price_threshold() {
+		// given
+		let mut txq = TransactionQueue::new();
+		let tx = new_tx();
+		txq.set_minimal_gas_price(tx.gas_price + U256::one());
+
+		// when
+		txq.add(tx, &default_nonce);
+
+		// then
+		let stats = txq.status();
+		assert_eq!(stats.pending, 0);
+		assert_eq!(stats.future, 0);
+	}
+
 	#[test]
 	fn should_import_txs_from_same_sender() {
 		// given

parity/main.rs

@@ -110,6 +110,7 @@ API and Console Options:
   --rpccorsdomain URL      Equivalent to --jsonrpc-cors URL (geth-compatible).
 
 Sealing/Mining Options:
+  --gasprice GAS           Minimal gas price a transaction must have to be accepted for mining [default: 20000000000].
   --author ADDRESS         Specify the block author (aka "coinbase") address for sending block rewards
                            from sealed blocks [default: 0037a6b811ffeb6e072da21179d11b1406371c63].
   --extradata STRING       Specify a custom extra-data for authored blocks, no more than 32 characters.
@@ -166,6 +167,7 @@ struct Args {
 	flag_rpcapi: Option<String>,
 	flag_logging: Option<String>,
 	flag_version: bool,
+	flag_gasprice: String,
 	flag_author: String,
 	flag_extra_data: Option<String>,
 }
@@ -251,7 +253,15 @@ impl Configuration {
 	}
 
 	fn author(&self) -> Address {
-		Address::from_str(&self.args.flag_author).unwrap_or_else(|_| die!("{}: Invalid address for --author. Must be 40 hex characters, without the 0x at the beginning.", self.args.flag_author))
+		Address::from_str(&self.args.flag_author).unwrap_or_else(|_| {
+			die!("{}: Invalid address for --author. Must be 40 hex characters, without the 0x at the beginning.", self.args.flag_author)
+		})
+	}
+
+	fn gasprice(&self) -> U256 {
+		U256::from_dec_str(self.args.flag_gasprice).unwrap_or_else(|_| {
+			die("{}: Invalid gasprice given. Must be a decimal unsigned 256-bit number.")
+		})
 	}
 
 	fn extra_data(&self) -> Bytes {
@@ -274,7 +284,9 @@ impl Configuration {
 			"frontier" | "homestead" | "mainnet" => ethereum::new_frontier(),
 			"morden" | "testnet" => ethereum::new_morden(),
 			"olympic" => ethereum::new_olympic(),
-			f => Spec::from_json_utf8(contents(f).unwrap_or_else(|_| die!("{}: Couldn't read chain specification file. Sure it exists?", f)).as_ref()),
+			f => Spec::from_json_utf8(contents(f).unwrap_or_else(|_| {
+				die!("{}: Couldn't read chain specification file. Sure it exists?", f)
+			}).as_ref()),
 		}
 	}
 
@@ -290,7 +302,9 @@ impl Configuration {
 		if self.args.flag_no_bootstrap { Vec::new() } else {
 			match self.args.arg_enode.len() {
 				0 => spec.nodes().clone(),
-				_ => self.args.arg_enode.iter().map(|s| Self::normalize_enode(s).unwrap_or_else(||die!("{}: Invalid node address format given for a boot node.", s))).collect(),
+				_ => self.args.arg_enode.iter().map(|s| Self::normalize_enode(s).unwrap_or_else(|| {
+					die!("{}: Invalid node address format given for a boot node.", s)
+				})).collect(),
 			}
 		}
 	}
@@ -301,17 +315,23 @@ impl Configuration {
 		let mut public_address = None;
 
 		if let Some(ref a) = self.args.flag_address {
-			public_address = Some(SocketAddr::from_str(a.as_ref()).unwrap_or_else(|_| die!("{}: Invalid listen/public address given with --address", a)));
+			public_address = Some(SocketAddr::from_str(a.as_ref()).unwrap_or_else(|_| {
+				die!("{}: Invalid listen/public address given with --address", a)
+			}));
 			listen_address = public_address;
 		}
 		if listen_address.is_none() {
-			listen_address = Some(SocketAddr::from_str(self.args.flag_listen_address.as_ref()).unwrap_or_else(|_| die!("{}: Invalid listen/public address given with --listen-address", self.args.flag_listen_address)));
+			listen_address = Some(SocketAddr::from_str(self.args.flag_listen_address.as_ref()).unwrap_or_else(|_| {
+				die!("{}: Invalid listen/public address given with --listen-address", self.args.flag_listen_address)
+			}));
 		}
 		if let Some(ref a) = self.args.flag_public_address {
 			if public_address.is_some() {
 				die!("Conflicting flags provided: --address and --public-address");
 			}
-			public_address = Some(SocketAddr::from_str(a.as_ref()).unwrap_or_else(|_| die!("{}: Invalid listen/public address given with --public-address", a)));
+			public_address = Some(SocketAddr::from_str(a.as_ref()).unwrap_or_else(|_| {
+				die!("{}: Invalid listen/public address given with --public-address", a)
+			}));
 		}
 		(listen_address, public_address)
 	}
@@ -426,6 +446,7 @@ impl Configuration {
 		let miner = Miner::new();
 		miner.set_author(self.author());
 		miner.set_extra_data(self.extra_data());
+		miner.set_minimal_gas_price(self.gasprice());
 
 		// Sync
 		let sync = EthSync::register(service.network(), sync_config, client.clone(), miner.clone());
@@ -514,7 +535,11 @@ impl Informant {
 		let report = client.report();
 		let sync_info = sync.status();
 
-		if let (_, _, &Some(ref last_report)) = (self.chain_info.read().unwrap().deref(), self.cache_info.read().unwrap().deref(), self.report.read().unwrap().deref()) {
+		if let (_, _, &Some(ref last_report)) = (
+			self.chain_info.read().unwrap().deref(),
+			self.cache_info.read().unwrap().deref(),
+			self.report.read().unwrap().deref()
+		) {
 			println!("[ #{} {} ]---[ {} blk/s | {} tx/s | {} gas/s  //··· {}/{} peers, #{}, {}+{} queued ···// mem: {} db, {} chain, {} queue, {} sync ]",
 				chain_info.best_block_number,
 				chain_info.best_block_hash,