Stop adding transactions to queue while not fully synced

sync/src/chain.rs

@@ -937,6 +937,11 @@ impl ChainSync {
 	}
 	/// Called when peer sends us new transactions
 	fn on_peer_transactions(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
+		// accepting transactions once only fully synced
+		if !io.is_chain_queue_empty() {
+			return Ok(());
+		}
+
 		let item_count = r.item_count();
 		trace!(target: "sync", "{} -> Transactions ({} entries)", peer_id, item_count);
 
@@ -1282,10 +1287,12 @@ impl ChainSync {
 
 	/// called when block is imported to chain, updates transactions queue and propagates the blocks
 	pub fn chain_new_blocks(&mut self, io: &mut SyncIo, imported: &[H256], invalid: &[H256], enacted: &[H256], retracted: &[H256]) {
-		// Notify miner
-		self.miner.chain_new_blocks(io.chain(), imported, invalid, enacted, retracted);
-		// Propagate latests blocks
-		self.propagate_latest_blocks(io);
+		if io.is_chain_queue_empty() {
+			// Notify miner
+			self.miner.chain_new_blocks(io.chain(), imported, invalid, enacted, retracted);
+			// Propagate latests blocks
+			self.propagate_latest_blocks(io);
+		}
 		// TODO [todr] propagate transactions?
 	}
 
@@ -1654,6 +1661,33 @@ mod tests {
 		assert_eq!(status.transactions_in_future_queue, 0);
 	}
 
+	#[test]
+	fn should_not_add_transactions_to_queue_if_not_synced() {
+		// given
+		let mut client = TestBlockChainClient::new();
+		client.add_blocks(98, EachBlockWith::Uncle);
+		client.add_blocks(1, EachBlockWith::UncleAndTransaction);
+		client.add_blocks(1, EachBlockWith::Transaction);
+		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5));
+
+		let good_blocks = vec![client.block_hash_delta_minus(2)];
+		let retracted_blocks = vec![client.block_hash_delta_minus(1)];
+
+		let mut queue = VecDeque::new();
+		let mut io = TestIo::new(&mut client, &mut queue, None);
+
+		// when
+		sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks);
+		assert_eq!(sync.miner.status().transactions_in_future_queue, 0);
+		assert_eq!(sync.miner.status().transactions_in_pending_queue, 0);
+		sync.chain_new_blocks(&mut io, &good_blocks, &[], &[], &retracted_blocks);
+
+		// then
+		let status = sync.miner.status();
+		assert_eq!(status.transactions_in_pending_queue, 0);
+		assert_eq!(status.transactions_in_future_queue, 0);
+	}
+
 	#[test]
 	fn returns_requested_block_headers() {
 		let mut client = TestBlockChainClient::new();

sync/src/io.rs

@@ -37,6 +37,10 @@ pub trait SyncIo {
 	fn peer_info(&self, peer_id: PeerId) -> String {
 		peer_id.to_string()
 	}
+	/// Returns if the chain block queue empty
+	fn is_chain_queue_empty(&self) -> bool {
+		self.chain().queue_info().is_empty()
+	}
 }
 
 /// Wraps `NetworkContext` and the blockchain client

sync/src/lib.rs

@@ -173,7 +173,7 @@ impl NetworkProtocolHandler<SyncMessage> for EthSync {
 			SyncMessage::NewChainHead => {
 				let mut sync_io = NetSyncIo::new(io, self.chain.deref());
 				self.sync.write().unwrap().chain_new_head(&mut sync_io);
-			}
+			},
 			_ => {/* Ignore other messages */},
 		}
 	}