core: avoid double parsing blocks after hoh

src/cryptonote_core/blockchain.cpp

@@ -4211,13 +4211,14 @@ uint64_t Blockchain::prevalidate_block_hashes(uint64_t height, const std::vector
 //    vs [k_image, output_keys] (m_scan_table). This is faster because it takes advantage of bulk queries
 //    and is threaded if possible. The table (m_scan_table) will be used later when querying output
 //    keys.
-bool Blockchain::prepare_handle_incoming_blocks(const std::vector<block_complete_entry> &blocks_entry)
+bool Blockchain::prepare_handle_incoming_blocks(const std::vector<block_complete_entry> &blocks_entry, std::vector<block> &blocks)
 {
   MTRACE("Blockchain::" << __func__);
   TIME_MEASURE_START(prepare);
   bool stop_batch;
   uint64_t bytes = 0;
   size_t total_txs = 0;
+  blocks.clear();
 
   // Order of locking must be:
   //  m_incoming_tx_lock (optional)
@@ -4264,7 +4265,6 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::vector<block_complete
   bool blocks_exist = false;
   tools::threadpool& tpool = tools::threadpool::getInstance();
   unsigned threads = tpool.get_max_concurrency();
-  std::vector<block> blocks;
   blocks.resize(blocks_entry.size());
 
   if (1)

src/cryptonote_core/blockchain.h

@@ -230,11 +230,12 @@ namespace cryptonote
     /**
      * @brief performs some preprocessing on a group of incoming blocks to speed up verification
      *
-     * @param blocks a list of incoming blocks
+     * @param blocks_entry a list of incoming blocks
+     * @param blocks the parsed blocks
      *
      * @return false on erroneous blocks, else true
      */
-    bool prepare_handle_incoming_blocks(const std::vector<block_complete_entry>  &blocks);
+    bool prepare_handle_incoming_blocks(const std::vector<block_complete_entry>  &blocks_entry, std::vector<block> &blocks);
 
     /**
      * @brief incoming blocks post-processing, cleanup, and disk sync

src/cryptonote_core/cryptonote_core.cpp

@@ -1330,7 +1330,8 @@ namespace cryptonote
       m_miner.resume();
       return false;
     }
-    prepare_handle_incoming_blocks(blocks);
+    std::vector<block> pblocks;
+    prepare_handle_incoming_blocks(blocks, pblocks);
     m_blockchain_storage.add_new_block(b, bvc);
     cleanup_handle_incoming_blocks(true);
     //anyway - update miner template
@@ -1381,10 +1382,10 @@ namespace cryptonote
   }
 
   //-----------------------------------------------------------------------------------------------
-  bool core::prepare_handle_incoming_blocks(const std::vector<block_complete_entry> &blocks)
+  bool core::prepare_handle_incoming_blocks(const std::vector<block_complete_entry> &blocks_entry, std::vector<block> &blocks)
   {
     m_incoming_tx_lock.lock();
-    m_blockchain_storage.prepare_handle_incoming_blocks(blocks);
+    m_blockchain_storage.prepare_handle_incoming_blocks(blocks_entry, blocks);
     return true;
   }
 
@@ -1401,7 +1402,7 @@ namespace cryptonote
   }
 
   //-----------------------------------------------------------------------------------------------
-  bool core::handle_incoming_block(const blobdata& block_blob, block_verification_context& bvc, bool update_miner_blocktemplate)
+  bool core::handle_incoming_block(const blobdata& block_blob, const block *b, block_verification_context& bvc, bool update_miner_blocktemplate)
   {
     TRY_ENTRY();
 
@@ -1417,14 +1418,18 @@ namespace cryptonote
       return false;
     }
 
-    block b = AUTO_VAL_INIT(b);
-    if(!parse_and_validate_block_from_blob(block_blob, b))
+    block lb;
+    if (!b)
     {
-      LOG_PRINT_L1("Failed to parse and validate new block");
-      bvc.m_verifivation_failed = true;
-      return false;
+      if(!parse_and_validate_block_from_blob(block_blob, lb))
+      {
+        LOG_PRINT_L1("Failed to parse and validate new block");
+        bvc.m_verifivation_failed = true;
+        return false;
+      }
+      b = &lb;
     }
-    add_new_block(b, bvc);
+    add_new_block(*b, bvc);
     if(update_miner_blocktemplate && bvc.m_added_to_main_chain)
        update_miner_block_template();
     return true;

src/cryptonote_core/cryptonote_core.h

@@ -146,20 +146,21 @@ namespace cryptonote
       * optionally updates the miner's block template.
       *
       * @param block_blob the block to be added
+      * @param block the block to be added, or NULL
       * @param bvc return-by-reference metadata context about the block's validity
       * @param update_miner_blocktemplate whether or not to update the miner's block template
       *
       * @return false if loading new checkpoints fails, or the block is not
       * added, otherwise true
       */
-     bool handle_incoming_block(const blobdata& block_blob, block_verification_context& bvc, bool update_miner_blocktemplate = true);
+     bool handle_incoming_block(const blobdata& block_blob, const block *b, block_verification_context& bvc, bool update_miner_blocktemplate = true);
 
      /**
       * @copydoc Blockchain::prepare_handle_incoming_blocks
       *
       * @note see Blockchain::prepare_handle_incoming_blocks
       */
-     bool prepare_handle_incoming_blocks(const std::vector<block_complete_entry>  &blocks);
+     bool prepare_handle_incoming_blocks(const std::vector<block_complete_entry> &blocks_entry, std::vector<block> &blocks);
 
      /**
       * @copydoc Blockchain::cleanup_handle_incoming_blocks