blockchain sync: reduce disk writes from 2 to 1 per tx

Author: jeffro256

src/blockchain_utilities/blockchain_import.cpp

@@ -173,7 +173,9 @@ int check_flush(cryptonote::core &core, std::vector<block_complete_entry> &block
     for(auto& tx_blob: block_entry.txs)
     {
       tx_verification_context tvc = AUTO_VAL_INIT(tvc);
-      core.handle_incoming_tx(tx_blob, tvc, relay_method::block, true);
+      CHECK_AND_ASSERT_THROW_MES(tx_blob.prunable_hash == crypto::null_hash,
+        "block entry must not contain pruned txs");
+      core.handle_incoming_tx(tx_blob.blob, tvc, relay_method::block, true);
       if(tvc.m_verifivation_failed)
       {
         cryptonote::transaction transaction;

src/cryptonote_basic/cryptonote_format_utils.cpp

@@ -257,6 +257,7 @@ namespace cryptonote
     CHECK_AND_ASSERT_MES(r, false, "Failed to parse transaction from blob");
     CHECK_AND_ASSERT_MES(expand_transaction_1(tx, false), false, "Failed to expand transaction data");
     tx.invalidate_hashes();
+    tx.set_blob_size(tx_blob.size());
     //TODO: validate tx
 
     return get_transaction_hash(tx, tx_hash);
@@ -520,6 +521,19 @@ namespace cryptonote
     return get_transaction_weight(tx, blob_size);
   }
   //---------------------------------------------------------------
+  uint64_t get_transaction_blob_size(const transaction& tx)
+  {
+    if (!tx.is_blob_size_valid())
+    {
+      const cryptonote::blobdata tx_blob = tx_to_blob(tx);
+      tx.set_blob_size(tx_blob.size());
+    }
+
+    CHECK_AND_ASSERT_THROW_MES(tx.is_blob_size_valid(), "BUG: blob size valid not set");
+
+    return tx.blob_size;
+  }
+  //---------------------------------------------------------------
   bool get_tx_fee(const transaction& tx, uint64_t & fee)
   {
     if (tx.version > 1)

src/cryptonote_basic/cryptonote_format_utils.h

@@ -137,6 +137,7 @@ namespace cryptonote
   uint64_t get_transaction_weight(const transaction &tx);
   uint64_t get_transaction_weight(const transaction &tx, size_t blob_size);
   uint64_t get_pruned_transaction_weight(const transaction &tx);
+  uint64_t get_transaction_blob_size(const transaction& tx);
 
   bool check_money_overflow(const transaction& tx);
   bool check_outs_overflow(const transaction& tx);

src/cryptonote_basic/verification_context.h

@@ -68,6 +68,7 @@ namespace cryptonote
     bool m_marked_as_orphaned;
     bool m_already_exists;
     bool m_partial_block_reward;
-    bool m_bad_pow; // if bad pow, bad peer outright for DoS protection
+    bool m_bad_pow; // if bad pow, ban peer outright for DoS protection
+    bool m_missing_txs; // set if, during verif, we don't have all the necessary txs available
   };
 }