From f3a60000946c86a42abbac3b8c4d9e6865b9cefb Mon Sep 17 00:00:00 2001
From: warptangent <warptangent@tutanota.com>
Date: Mon, 8 Feb 2016 08:32:19 -0800
Subject: BlockchainDB/LMDB/BDB: Extract DB txn functions for block add/remove

---
 src/blockchain_db/lmdb/db_lmdb.cpp | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'src/blockchain_db/lmdb/db_lmdb.cpp')

diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index 401983f19..de82357b6 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -2190,6 +2190,44 @@ void BlockchainLMDB::set_batch_transactions(bool batch_transactions)
   LOG_PRINT_L3("batch transactions " << (m_batch_transactions ? "enabled" : "disabled"));
 }
 
+void BlockchainLMDB::block_txn_start()
+{
+  LOG_PRINT_L3("BlockchainLMDB::" << __func__);
+  if (! m_batch_active && m_write_txn)
+    throw0(DB_ERROR((std::string("Attempted to start new write txn when write txn already exists in ")+__FUNCTION__).c_str()));
+  if (! m_batch_active)
+  {
+    m_write_txn = new mdb_txn_safe();
+    if (auto mdb_res = mdb_txn_begin(m_env, NULL, 0, *m_write_txn))
+      throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", mdb_res).c_str()));
+  }
+}
+
+void BlockchainLMDB::block_txn_stop()
+{
+  LOG_PRINT_L3("BlockchainLMDB::" << __func__);
+  if (! m_batch_active)
+  {
+    TIME_MEASURE_START(time1);
+    m_write_txn->commit();
+    TIME_MEASURE_FINISH(time1);
+    time_commit1 += time1;
+
+    delete m_write_txn;
+    m_write_txn = NULL;
+  }
+}
+
+void BlockchainLMDB::block_txn_abort()
+{
+  LOG_PRINT_L3("BlockchainLMDB::" << __func__);
+  if (! m_batch_active)
+  {
+    delete m_write_txn;
+    m_write_txn = NULL;
+  }
+}
+
 uint64_t BlockchainLMDB::add_block(const block& blk, const size_t& block_size, const difficulty_type& cumulative_difficulty, const uint64_t& coins_generated,
     const std::vector<transaction>& txs)
 {
-- 
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