Fixed error in block spec collection

src/rpc/miner.rs

@@ -13,6 +13,7 @@ use mdbx::WriteMap;
 use rand::Rng;
 use tracing::{debug, info};
 
+use crate::consensus::miner::get_latest_parent_header;
 use crate::{
     accessors::chain,
     consensus::{
@@ -57,9 +58,20 @@ impl MinerApiServer for MinerRpc {
     async fn mine(&self, behavior: BehaviorWithSignature) -> RpcResult<ExecutedBlock> {
         let db1 = Arc::clone(&self.db);
         let db2 = Arc::clone(&self.db);
+        let db3 = Arc::clone(&self.db);
 
+        let tx = db3.begin()?;
+        let last_header = get_latest_parent_header(&tx);
+        let last_block_number = {
+            if last_header.is_err() {
+                BlockNumber(0)
+            } else {
+                let header = last_header.unwrap();
+                header.number
+            }
+        };
         let chain_spec = self.chain_spec.clone();
-        let block_spec = self.chain_spec.collect_block_spec(BlockNumber(0));
+        let block_spec = self.chain_spec.collect_block_spec(last_block_number);
         let node = self.node.clone();
 
         tokio::task::spawn_blocking(move || {