close connection after pushnewblock error

api/service/syncing/downloader/client.go

@@ -89,7 +89,7 @@ func (client *Client) Register(hash []byte, ip, port string) *pb.DownloaderRespo
 }
 
 // PushNewBlock will send the lastest verified block to registered nodes
-func (client *Client) PushNewBlock(selfPeerHash [20]byte, blockHash []byte, timeout bool) *pb.DownloaderResponse {
+func (client *Client) PushNewBlock(selfPeerHash [20]byte, blockHash []byte, timeout bool) (*pb.DownloaderResponse, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
 
@@ -107,7 +107,7 @@ func (client *Client) PushNewBlock(selfPeerHash [20]byte, blockHash []byte, time
 	if err != nil {
 		utils.Logger().Error().Err(err).Str("target", client.conn.Target()).Msg("[SYNC] unable to send new block to unsync node")
 	}
-	return response
+	return response, err
 }
 
 // GetBlockChainHeight gets the blockheight from peer

node/node_syncing.go

@@ -296,7 +296,12 @@ func (node *Node) SendNewBlockToUnsync() {
 				delete(node.peerRegistrationRecord, peerID)
 				continue
 			}
-			response := config.client.PushNewBlock(node.GetSyncID(), blockHash, false)
+			response, err := config.client.PushNewBlock(node.GetSyncID(), blockHash, false)
+			// close the connection if cannot push new block to unsync node
+			if err != nil {
+				node.peerRegistrationRecord[peerID].client.Close()
+				delete(node.peerRegistrationRecord, peerID)
+			}
 			if response != nil && response.Type == downloader_pb.DownloaderResponse_INSYNC {
 				node.peerRegistrationRecord[peerID].client.Close()
 				delete(node.peerRegistrationRecord, peerID)