stop eth_syncing from returning true forever

rpc/src/v1/impls/eth.rs

@@ -244,12 +244,14 @@ impl<C, S, A, M, EM> Eth for EthClient<C, S, A, M, EM> where
 				let res = match status.state {
 					SyncState::Idle => SyncStatus::None,
 					SyncState::Waiting | SyncState::Blocks | SyncState::NewBlocks | SyncState::ChainHead => {
+						let current_block = U256::from(take_weak!(self.client).chain_info().best_block_number);
+
 						let info = SyncInfo {
 							starting_block: U256::from(status.start_block_number),
-							current_block: U256::from(take_weak!(self.client).chain_info().best_block_number),
+							current_block: current_block,
 							highest_block: U256::from(status.highest_block_number.unwrap_or(status.start_block_number))
 						};
-						match info.highest_block > info.starting_block + U256::from(6) {
+						match info.highest_block > info.current_block + U256::from(6) {
 							true => SyncStatus::Info(info),
 							false => SyncStatus::None,
 						}

rpc/src/v1/tests/mocked/eth.rs

@@ -107,6 +107,7 @@ fn rpc_eth_syncing() {
 		status.state = SyncState::Blocks;
 		status.highest_block_number = Some(2500);
 
+		// "sync" to 1000 blocks.
 		// causes TestBlockChainClient to return 1000 for its best block number.
 		let mut blocks = tester.client.blocks.write().unwrap();
 		for i in 0..1000 {
@@ -116,6 +117,16 @@ fn rpc_eth_syncing() {
 
 	let true_res = r#"{"jsonrpc":"2.0","result":{"currentBlock":"0x03e8","highestBlock":"0x09c4","startingBlock":"0x00"},"id":1}"#;
 	assert_eq!(tester.io.handle_request(request), Some(true_res.to_owned()));
+
+	{
+		// finish "syncing"
+		let mut blocks = tester.client.blocks.write().unwrap();
+		for i in 0..1500 {
+			blocks.insert(H256::from(i + 1000), Vec::new());
+		}
+	}
+
+	assert_eq!(tester.io.handle_request(request), Some(false_res.to_owned()));
 }
 
 #[test]