Fix local transactions policy. (#8691)

Author: tomusdrw

miner/src/pool/scoring.rs

@@ -108,6 +108,15 @@ impl txpool::Scoring<VerifiedTransaction> for NonceAndGasPrice {
 			}
 		}
 
+		// Always kick out non-local transactions in favour of local ones.
+		if new.priority().is_local() && !old.priority().is_local() {
+			return true;
+		}
+		// And never kick out local transactions in favour of external ones.
+		if !new.priority().is_local() && old.priority.is_local() {
+			return false;
+		}
+
 		self.choose(old, new) == txpool::scoring::Choice::ReplaceOld
 	}
 }
@@ -119,6 +128,21 @@ mod tests {
 	use pool::tests::tx::{Tx, TxExt};
 	use txpool::Scoring;
 
+	#[test]
+	fn should_replace_non_local_transaction_with_local_one() {
+		// given
+		let scoring = NonceAndGasPrice(PrioritizationStrategy::GasPriceOnly);
+		let tx1 = Tx::default().signed().verified();
+		let tx2 = {
+			let mut tx = Tx::default().signed().verified();
+			tx.priority = ::pool::Priority::Local;
+			tx
+		};
+
+		assert!(scoring.should_replace(&tx1, &tx2));
+		assert!(!scoring.should_replace(&tx2, &tx1));
+	}
+
 	#[test]
 	fn should_calculate_score_correctly() {
 		// given

miner/src/pool/tests/mod.rs

@@ -766,4 +766,35 @@ fn should_reject_big_transaction() {
 		verifier::Transaction::Local(PendingTransaction::new(big_tx, transaction::Condition::Timestamp(1000).into()))
 	]);
 	assert_eq!(res, vec![Err(transaction::Error::TooBig)]);
-}
+}
+
+#[test]
+fn should_include_local_transaction_to_a_full_pool() {
+	// given
+	let txq = TransactionQueue::new(
+		txpool::Options {
+			max_count: 1,
+			max_per_sender: 2,
+			max_mem_usage: 50
+		},
+		verifier::Options {
+			minimal_gas_price: 1.into(),
+			block_gas_limit: 1_000_000.into(),
+			tx_gas_limit: 1_000_000.into(),
+		},
+		PrioritizationStrategy::GasPriceOnly,
+	);
+	let tx1 = Tx::gas_price(10_000).signed().unverified();
+	let tx2 = Tx::gas_price(1).signed().local();
+
+	let res = txq.import(TestClient::new().with_balance(1_000_000_000), vec![tx1]);
+	assert_eq!(res, vec![Ok(())]);
+	assert_eq!(txq.status().status.transaction_count, 1);
+
+	// when
+	let res = txq.import(TestClient::new(), vec![tx2]);
+	assert_eq!(res, vec![Ok(())]);
+
+	// then
+	assert_eq!(txq.status().status.transaction_count, 1);
+}