5 files changed, 82 insertions, 6 deletions

diff --git a/src/blockchain_db/blockchain_db.cpp b/src/blockchain_db/blockchain_db.cpp
index a6774a25c..01a59e079 100644
--- a/src/blockchain_db/blockchain_db.cpp
+++ b/src/blockchain_db/blockchain_db.cpp
@@ -33,6 +33,19 @@
 #include "profile_tools.h"
 #include "ringct/rctOps.h"
 
+#include "lmdb/db_lmdb.h"
+#ifdef BERKELEY_DB
+#include "berkeleydb/db_bdb.h"
+#endif
+
+static const char *db_types[] = {
+  "lmdb",
+#ifdef BERKELEY_DB
+  "berkeley",
+#endif
+  NULL
+};
+
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "blockchain.db"
 
@@ -41,6 +54,41 @@ using epee::string_tools::pod_to_hex;
 namespace cryptonote
 {
 
+bool blockchain_valid_db_type(const std::string& db_type)
+{
+  int i;
+  for (i=0; db_types[i]; i++)
+  {
+    if (db_types[i] == db_type)
+      return true;
+  }
+  return false;
+}
+
+std::string blockchain_db_types(const std::string& sep)
+{
+  int i;
+  std::string ret = "";
+  for (i=0; db_types[i]; i++)
+  {
+    if (i)
+      ret += sep;
+    ret += db_types[i];
+  }
+  return ret;
+}
+
+BlockchainDB *new_db(const std::string& db_type)
+{
+  if (db_type == "lmdb")
+    return new BlockchainLMDB();
+#if defined(BERKELEY_DB)
+  if (db_type == "berkeley")
+    return new BlockchainBDB();
+#endif
+  return NULL;
+}
+
 void BlockchainDB::pop_block()
 {
   block blk;
diff --git a/src/blockchain_db/blockchain_db.h b/src/blockchain_db/blockchain_db.h
index 27e63801d..ad246d85e 100644
--- a/src/blockchain_db/blockchain_db.h
+++ b/src/blockchain_db/blockchain_db.h
@@ -145,6 +145,12 @@ struct txpool_tx_meta_t
   uint8_t padding[77]; // till 192 bytes
 };
 
+#define DBF_SAFE       1
+#define DBF_FAST       2
+#define DBF_FASTEST    4
+#define DBF_RDONLY     8
+#define DBF_SALVAGE 0x10
+
 /***********************************
  * Exception Definitions
  ***********************************/
@@ -600,6 +606,13 @@ public:
   virtual void sync() = 0;
 
   /**
+   * @brief toggle safe syncs for the DB
+   *
+   * Used to switch DBF_SAFE on or off after starting up with DBF_FAST.
+   */
+  virtual void safesyncmode(const bool onoff) = 0;
+
+  /**
    * @brief Remove everything from the BlockchainDB
    *
    * This function should completely remove all data from a BlockchainDB.
@@ -1491,6 +1504,7 @@ public:
 
 };  // class BlockchainDB
 
+BlockchainDB *new_db(const std::string& db_type);
 
 }  // namespace cryptonote
 
diff --git a/src/blockchain_db/db_types.h b/src/blockchain_db/db_types.h
index 6c21b029e..8e2f58a61 100644
--- a/src/blockchain_db/db_types.h
+++ b/src/blockchain_db/db_types.h
@@ -31,9 +31,6 @@
 
 namespace cryptonote
 {
-
-  const std::unordered_set<std::string> blockchain_db_types = 
-  { "lmdb"
-  };
-
+  bool blockchain_valid_db_type(const std::string& db_type);
+  std::string blockchain_db_types(const std::string& sep);
 } // namespace cryptonote
diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index 4441c7578..4100d9cca 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -1083,9 +1083,10 @@ BlockchainLMDB::BlockchainLMDB(bool batch_transactions)
   m_hardfork = nullptr;
 }
 
-void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
+void BlockchainLMDB::open(const std::string& filename, const int db_flags)
 {
   int result;
+  int mdb_flags = MDB_NORDAHEAD;
 
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
 
@@ -1124,6 +1125,15 @@ void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
 
   size_t mapsize = DEFAULT_MAPSIZE;
 
+  if (db_flags & DBF_FAST)
+    mdb_flags |= MDB_NOSYNC;
+  if (db_flags & DBF_FASTEST)
+    mdb_flags |= MDB_NOSYNC | MDB_WRITEMAP | MDB_MAPASYNC;
+  if (db_flags & DBF_RDONLY)
+    mdb_flags = MDB_RDONLY;
+  if (db_flags & DBF_SALVAGE)
+    mdb_flags |= MDB_PREVSNAPSHOT;
+
   if (auto result = mdb_env_open(m_env, filename.c_str(), mdb_flags, 0644))
     throw0(DB_ERROR(lmdb_error("Failed to open lmdb environment: ", result).c_str()));
 
@@ -1308,6 +1318,11 @@ void BlockchainLMDB::sync()
   }
 }
 
+void BlockchainLMDB::safesyncmode(const bool onoff)
+{
+  mdb_env_set_flags(m_env, MDB_NOSYNC|MDB_MAPASYNC, !onoff);
+}
+
 void BlockchainLMDB::reset()
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
diff --git a/src/blockchain_db/lmdb/db_lmdb.h b/src/blockchain_db/lmdb/db_lmdb.h
index 14e5d34e2..3a11ddf0d 100644
--- a/src/blockchain_db/lmdb/db_lmdb.h
+++ b/src/blockchain_db/lmdb/db_lmdb.h
@@ -165,6 +165,8 @@ public:
 
   virtual void sync();
 
+  virtual void safesyncmode(const bool onoff);
+
   virtual void reset();
 
   virtual std::vector<std::string> get_filenames() const;