core: avoid double parsing blocks after hoh

src/blockchain_utilities/blockchain_import.cpp

@@ -193,8 +193,16 @@ int check_flush(cryptonote::core &core, std::vector<block_complete_entry> &block
   }
   core.prevalidate_block_hashes(core.get_blockchain_storage().get_db().height(), hashes);
 
-  core.prepare_handle_incoming_blocks(blocks);
+  std::vector<block> pblocks;
+  core.prepare_handle_incoming_blocks(blocks, pblocks);
+  if (!pblocks.empty() && pblocks.size() != blocks.size())
+  {
+    MERROR("Unexpected parsed blocks size");
+    core.cleanup_handle_incoming_blocks();
+    return 1;
+  }
 
+  size_t blockidx = 0;
   for(const block_complete_entry& block_entry: blocks)
   {
     // process transactions
@@ -215,7 +223,7 @@ int check_flush(cryptonote::core &core, std::vector<block_complete_entry> &block
 
     block_verification_context bvc = boost::value_initialized<block_verification_context>();
 
-    core.handle_incoming_block(block_entry.block, bvc, false); // <--- process block
+    core.handle_incoming_block(block_entry.block, pblocks.empty() ? NULL : &pblocks[blockidx++], bvc, false); // <--- process block
 
     if(bvc.m_verifivation_failed)
     {

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);
+    block lb;
-    if(!parse_and_validate_block_from_blob(block_blob, b))
+    if (!b)
+    {
+      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;
       }
-    add_new_block(b, bvc);
+      b = &lb;
+    }
+    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

src/cryptonote_protocol/cryptonote_protocol_handler.inl

@@ -418,7 +418,8 @@ namespace cryptonote
     m_core.pause_mine();
     std::vector<block_complete_entry> blocks;
     blocks.push_back(arg.b);
-    m_core.prepare_handle_incoming_blocks(blocks);
+    std::vector<block> pblocks;
+    m_core.prepare_handle_incoming_blocks(blocks, pblocks);
     for(auto tx_blob_it = arg.b.txs.begin(); tx_blob_it!=arg.b.txs.end();tx_blob_it++)
     {
       cryptonote::tx_verification_context tvc = AUTO_VAL_INIT(tvc);
@@ -434,7 +435,7 @@ namespace cryptonote
     }
 
     block_verification_context bvc = boost::value_initialized<block_verification_context>();
-    m_core.handle_incoming_block(arg.b.block, bvc); // got block from handle_notify_new_block
+    m_core.handle_incoming_block(arg.b.block, pblocks.empty() ? NULL : &pblocks[0], bvc); // got block from handle_notify_new_block
     if (!m_core.cleanup_handle_incoming_blocks(true))
     {
       LOG_PRINT_CCONTEXT_L0("Failure in cleanup_handle_incoming_blocks");
@@ -697,10 +698,11 @@ namespace cryptonote
 
         std::vector<block_complete_entry> blocks;
         blocks.push_back(b);
-        m_core.prepare_handle_incoming_blocks(blocks);
+        std::vector<block> pblocks;
+        m_core.prepare_handle_incoming_blocks(blocks, pblocks);
           
         block_verification_context bvc = boost::value_initialized<block_verification_context>();
-        m_core.handle_incoming_block(arg.b.block, bvc); // got block from handle_notify_new_block
+        m_core.handle_incoming_block(arg.b.block, pblocks.empty() ? NULL : &pblocks[0], bvc); // got block from handle_notify_new_block
         if (!m_core.cleanup_handle_incoming_blocks(true))
         {
           LOG_PRINT_CCONTEXT_L0("Failure in cleanup_handle_incoming_blocks");
@@ -1174,10 +1176,17 @@ namespace cryptonote
             }
           }
 
-          m_core.prepare_handle_incoming_blocks(blocks);
+          std::vector<block> pblocks;
+          m_core.prepare_handle_incoming_blocks(blocks, pblocks);
+          if (!pblocks.empty() && pblocks.size() != blocks.size())
+          {
+            m_core.cleanup_handle_incoming_blocks();
+            LOG_ERROR_CCONTEXT("Internal error: blocks.size() != block_entry.txs.size()");
+            return 1;
+          }
 
           uint64_t block_process_time_full = 0, transactions_process_time_full = 0;
-          size_t num_txs = 0;
+          size_t num_txs = 0, blockidx = 0;
           for(const block_complete_entry& block_entry: blocks)
           {
             if (m_stopping)
@@ -1229,7 +1238,7 @@ namespace cryptonote
             TIME_MEASURE_START(block_process_time);
             block_verification_context bvc = boost::value_initialized<block_verification_context>();
 
-            m_core.handle_incoming_block(block_entry.block, bvc, false); // <--- process block
+            m_core.handle_incoming_block(block_entry.block, pblocks.empty() ? NULL : &pblocks[blockidx], bvc, false); // <--- process block
 
             if(bvc.m_verifivation_failed)
             {
@@ -1272,6 +1281,7 @@ namespace cryptonote
 
             TIME_MEASURE_FINISH(block_process_time);
             block_process_time_full += block_process_time;
+            ++blockidx;
 
           } // each download block