wallet: make ringdb an object with database state

6 files changed, 187 insertions, 170 deletions

diff --git a/src/blockchain_utilities/blockchain_blackball.cpp b/src/blockchain_utilities/blockchain_blackball.cpp
index 485b9d0bd..d065d61cb 100644
--- a/src/blockchain_utilities/blockchain_blackball.cpp
+++ b/src/blockchain_utilities/blockchain_blackball.cpp
@@ -310,6 +310,7 @@ int main(int argc, char* argv[])
   std::unordered_map<crypto::key_image, std::vector<uint64_t>> relative_rings;
   std::unordered_map<output_data, std::unordered_set<crypto::key_image>> outputs;
   std::unordered_set<output_data> spent, newly_spent;
+  tools::ringdb ringdb(output_file_path.string());
 
   for (size_t n = 0; n < inputs.size(); ++n)
   {
@@ -335,7 +336,7 @@ int main(int argc, char* argv[])
         {
           const crypto::public_key pkey = core_storage[n]->get_output_key(txin.amount, txin.key_offsets[0]);
           MINFO("Blackballing output " << pkey << ", due to being used in a 1-ring");
-          tools::ringdb::blackball(output_file_path.string(), pkey);
+          ringdb.blackball(pkey);
           newly_spent.insert(output_data(txin.amount, txin.key_offsets[0]));
           spent.insert(output_data(txin.amount, txin.key_offsets[0]));
         }
@@ -363,7 +364,7 @@ int main(int argc, char* argv[])
             {
               const crypto::public_key pkey = core_storage[n]->get_output_key(txin.amount, common[0]);
               MINFO("Blackballing output " << pkey << ", due to being used in rings with a single common element");
-              tools::ringdb::blackball(output_file_path.string(), pkey);
+              ringdb.blackball(pkey);
               newly_spent.insert(output_data(txin.amount, common[0]));
               spent.insert(output_data(txin.amount, common[0]));
             }
@@ -407,8 +408,9 @@ int main(int argc, char* argv[])
         if (known == absolute.size() - 1)
         {
           const crypto::public_key pkey = core_storage[0]->get_output_key(od.amount, last_unknown);
-          MINFO("Blackballing output " << pkey << ", due to being used in rings where all other outputs are known to be spent");
-          tools::ringdb::blackball(output_file_path.string(), pkey);
+          MINFO("Blackballing output " << pkey << ", due to being used in a " <<
+              absolute.size() << "-ring where all other outputs are known to be spent");
+          ringdb.blackball(pkey);
           newly_spent.insert(output_data(od.amount, last_unknown));
           spent.insert(output_data(od.amount, last_unknown));
         }
diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index 315d91aa6..89edee3fe 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -1312,7 +1312,7 @@ bool simple_wallet::print_ring(const std::vector<std::string> &args)
   std::vector<uint64_t> ring;
   try
   {
-    if (m_wallet->get_ring(m_wallet->get_ring_database(), key_image, ring))
+    if (m_wallet->get_ring(key_image, ring))
     {
       std::stringstream str;
       for (const auto &x: ring)
@@ -1466,7 +1466,7 @@ bool simple_wallet::save_known_rings(const std::vector<std::string> &args)
   try
   {
     LOCK_IDLE_SCOPE();
-    m_wallet->find_and_save_rings(m_wallet->get_ring_database());
+    m_wallet->find_and_save_rings();
   }
   catch (const std::exception &e)
   {
diff --git a/src/wallet/ringdb.cpp b/src/wallet/ringdb.cpp
index 198312dc4..bd2b4453b 100644
--- a/src/wallet/ringdb.cpp
+++ b/src/wallet/ringdb.cpp
@@ -172,115 +172,64 @@ static size_t get_ring_data_size(size_t n_entries)
 
 enum { BLACKBALL_BLACKBALL, BLACKBALL_UNBLACKBALL, BLACKBALL_QUERY, BLACKBALL_CLEAR};
 
-static bool blackball_worker(const std::string &filename, const crypto::public_key &output, int op)
+namespace tools
+{
+
+ringdb::ringdb(std::string filename):
+  filename(filename)
 {
-  MDB_env *env;
-  MDB_dbi dbi;
   MDB_txn *txn;
-  MDB_cursor *cursor;
-  int dbr;
   bool tx_active = false;
-  bool ret = true;
+  int dbr;
 
-  if (filename.empty())
-    return true;
   tools::create_directories_if_necessary(filename);
 
   dbr = mdb_env_create(&env);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LDMB environment: " + std::string(mdb_strerror(dbr)));
-  dbr = mdb_env_set_maxdbs(env, 1);
+  dbr = mdb_env_set_maxdbs(env, 2);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set max env dbs: " + std::string(mdb_strerror(dbr)));
-  dbr = mdb_env_open(env, get_rings_filename(filename).c_str(), 0, 0664);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file: " + std::string(mdb_strerror(dbr)));
-  epee::misc_utils::auto_scope_leave_caller env_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_env_close(env);});
-  dbr = resize_env(env, filename.c_str(), 32 * 2); // a pubkey, and some slack
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
+  const std::string actual_filename = get_rings_filename(filename); 
+  dbr = mdb_env_open(env, actual_filename.c_str(), 0, 0664);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file '"
+      + actual_filename + "': " + std::string(mdb_strerror(dbr)));
+
   dbr = mdb_txn_begin(env, NULL, 0, &txn);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
   epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
   tx_active = true;
-  dbr = mdb_dbi_open(txn, "blackballs", MDB_CREATE | MDB_INTEGERKEY | MDB_DUPSORT | MDB_DUPFIXED, &dbi);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
-  epee::misc_utils::auto_scope_leave_caller dbi_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_dbi_close(env, dbi);});
-  mdb_set_dupsort(txn, dbi, compare_hash32);
 
-  MDB_val key = zerokeyval;
-  MDB_val data;
-  data.mv_data = (void*)&output;
-  data.mv_size = sizeof(output);
+  dbr = mdb_dbi_open(txn, "rings", MDB_CREATE, &dbi_rings);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
+  mdb_set_compare(txn, dbi_rings, compare_hash32);
 
-  switch (op)
-  {
-    case BLACKBALL_BLACKBALL:
-      MDEBUG("Blackballing output " << output);
-      dbr = mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA);
-      if (dbr == MDB_KEYEXIST)
-        dbr = 0;
-      break;
-    case BLACKBALL_UNBLACKBALL:
-      MDEBUG("Unblackballing output " << output);
-      dbr = mdb_del(txn, dbi, &key, &data);
-      if (dbr == MDB_NOTFOUND)
-        dbr = 0;
-      break;
-    case BLACKBALL_QUERY:
-      MDEBUG("Querying blackball status for output " << output);
-      dbr = mdb_cursor_open(txn, dbi, &cursor);
-      THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create cursor for blackballs table: " + std::string(mdb_strerror(dbr)));
-      dbr = mdb_cursor_get(cursor, &key, &data, MDB_GET_BOTH);
-      MDEBUG("Querying blackball status for output " << output << ": " << std::string(mdb_strerror(dbr)));
-      THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to lookup in blackballs table: " + std::string(mdb_strerror(dbr)));
-      ret = dbr != MDB_NOTFOUND;
-      if (dbr == MDB_NOTFOUND)
-        dbr = 0;
-      mdb_cursor_close(cursor);
-      break;
-    case BLACKBALL_CLEAR:
-      dbr = mdb_drop(txn, dbi, 0);
-      break;
-    default:
-      THROW_WALLET_EXCEPTION(tools::error::wallet_internal_error, "Invalid blackball op");
-  }
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to query blackballs table: " + std::string(mdb_strerror(dbr)));
+  dbr = mdb_dbi_open(txn, "blackballs", MDB_CREATE | MDB_INTEGERKEY | MDB_DUPSORT | MDB_DUPFIXED, &dbi_blackballs);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
+  mdb_set_dupsort(txn, dbi_blackballs, compare_hash32);
 
   dbr = mdb_txn_commit(txn);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn blackballing output to database: " + std::string(mdb_strerror(dbr)));
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn creating/opening database: " + std::string(mdb_strerror(dbr)));
   tx_active = false;
-  return ret;
 }
 
-namespace tools { namespace ringdb
+ringdb::~ringdb()
 {
+  mdb_dbi_close(env, dbi_rings);
+  mdb_dbi_close(env, dbi_blackballs);
+  mdb_env_close(env);
+}
 
-bool add_rings(const std::string &filename, const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx)
+bool ringdb::add_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx)
 {
-  MDB_env *env;
-  MDB_dbi dbi;
   MDB_txn *txn;
   int dbr;
   bool tx_active = false;
 
-  if (filename.empty())
-    return true;
-  tools::create_directories_if_necessary(filename);
-
-  dbr = mdb_env_create(&env);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LDMB environment: " + std::string(mdb_strerror(dbr)));
-  dbr = mdb_env_set_maxdbs(env, 1);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set max env dbs: " + std::string(mdb_strerror(dbr)));
-  dbr = mdb_env_open(env, get_rings_filename(filename).c_str(), 0, 0664);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file: " + std::string(mdb_strerror(dbr)));
-  epee::misc_utils::auto_scope_leave_caller env_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_env_close(env);});
   dbr = resize_env(env, filename.c_str(), get_ring_data_size(tx.vin.size()));
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size");
   dbr = mdb_txn_begin(env, NULL, 0, &txn);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
   epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
   tx_active = true;
-  dbr = mdb_dbi_open(txn, "rings", MDB_CREATE, &dbi);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
-  epee::misc_utils::auto_scope_leave_caller dbi_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_dbi_close(env, dbi);});
-  mdb_set_compare(txn, dbi, compare_hash32);
 
   for (const auto &in: tx.vin)
   {
@@ -301,7 +250,7 @@ bool add_rings(const std::string &filename, const crypto::chacha_key &chacha_key
     std::string data_ciphertext = encrypt(compressed_ring, txin.k_image, chacha_key);
     data.mv_size = data_ciphertext.size();
     data.mv_data = (void*)data_ciphertext.c_str();
-    dbr = mdb_put(txn, dbi, &key, &data, 0);
+    dbr = mdb_put(txn, dbi_rings, &key, &data, 0);
     THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to add ring to database: " + std::string(mdb_strerror(dbr)));
   }
 
@@ -311,35 +260,18 @@ bool add_rings(const std::string &filename, const crypto::chacha_key &chacha_key
   return true;
 }
 
-bool remove_rings(const std::string &filename, const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx)
+bool ringdb::remove_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx)
 {
-  MDB_env *env;
-  MDB_dbi dbi;
   MDB_txn *txn;
   int dbr;
   bool tx_active = false;
 
-  if (filename.empty())
-    return true;
-  tools::create_directories_if_necessary(filename);
-
-  dbr = mdb_env_create(&env);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LDMB environment: " + std::string(mdb_strerror(dbr)));
-  dbr = mdb_env_set_maxdbs(env, 1);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set max env dbs: " + std::string(mdb_strerror(dbr)));
-  dbr = mdb_env_open(env, get_rings_filename(filename).c_str(), 0, 0664);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file: " + std::string(mdb_strerror(dbr)));
-  epee::misc_utils::auto_scope_leave_caller env_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_env_close(env);});
   dbr = resize_env(env, filename.c_str(), 0);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size");
   dbr = mdb_txn_begin(env, NULL, 0, &txn);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
   epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
   tx_active = true;
-  dbr = mdb_dbi_open(txn, "rings", MDB_CREATE, &dbi);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
-  epee::misc_utils::auto_scope_leave_caller dbi_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_dbi_close(env, dbi);});
-  mdb_set_compare(txn, dbi, compare_hash32);
 
   for (const auto &in: tx.vin)
   {
@@ -355,14 +287,14 @@ bool remove_rings(const std::string &filename, const crypto::chacha_key &chacha_
     key.mv_data = (void*)key_ciphertext.data();
     key.mv_size = key_ciphertext.size();
 
-    dbr = mdb_get(txn, dbi, &key, &data);
+    dbr = mdb_get(txn, dbi_rings, &key, &data);
     THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to look for key image in LMDB table: " + std::string(mdb_strerror(dbr)));
     if (dbr == MDB_NOTFOUND)
       continue;
     THROW_WALLET_EXCEPTION_IF(data.mv_size <= 0, tools::error::wallet_internal_error, "Invalid ring data size");
 
     MDEBUG("Removing ring data for key image " << txin.k_image);
-    dbr = mdb_del(txn, dbi, &key, NULL);
+    dbr = mdb_del(txn, dbi_rings, &key, NULL);
     THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to remove ring to database: " + std::string(mdb_strerror(dbr)));
   }
 
@@ -372,41 +304,24 @@ bool remove_rings(const std::string &filename, const crypto::chacha_key &chacha_
   return true;
 }
 
-bool get_ring(const std::string &filename, const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs)
+bool ringdb::get_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs)
 {
-  MDB_env *env;
-  MDB_dbi dbi;
   MDB_txn *txn;
   int dbr;
   bool tx_active = false;
 
-  if (filename.empty())
-    return false;
-  tools::create_directories_if_necessary(filename);
-
-  dbr = mdb_env_create(&env);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LDMB environment: " + std::string(mdb_strerror(dbr)));
-  dbr = mdb_env_set_maxdbs(env, 1);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set max env dbs: " + std::string(mdb_strerror(dbr)));
-  dbr = mdb_env_open(env, get_rings_filename(filename).c_str(), 0, 0664);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file: " + std::string(mdb_strerror(dbr)));
-  epee::misc_utils::auto_scope_leave_caller env_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_env_close(env);});
   dbr = resize_env(env, filename.c_str(), 0);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
   dbr = mdb_txn_begin(env, NULL, 0, &txn);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
   epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
   tx_active = true;
-  dbr = mdb_dbi_open(txn, "rings", MDB_CREATE, &dbi);
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
-  epee::misc_utils::auto_scope_leave_caller dbi_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_dbi_close(env, dbi);});
-  mdb_set_compare(txn, dbi, compare_hash32);
 
   MDB_val key, data;
   std::string key_ciphertext = encrypt(key_image, chacha_key);
   key.mv_data = (void*)key_ciphertext.data();
   key.mv_size = key_ciphertext.size();
-  dbr = mdb_get(txn, dbi, &key, &data);
+  dbr = mdb_get(txn, dbi_rings, &key, &data);
   THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to look for key image in LMDB table: " + std::string(mdb_strerror(dbr)));
   if (dbr == MDB_NOTFOUND)
     return false;
@@ -425,24 +340,82 @@ bool get_ring(const std::string &filename, const crypto::chacha_key &chacha_key,
   return true;
 }
 
-bool blackball(const std::string &filename, const crypto::public_key &output)
+bool ringdb::blackball_worker(const crypto::public_key &output, int op)
 {
-  return blackball_worker(filename, output, BLACKBALL_BLACKBALL);
+  MDB_txn *txn;
+  MDB_cursor *cursor;
+  int dbr;
+  bool tx_active = false;
+  bool ret = true;
+
+  dbr = resize_env(env, filename.c_str(), 32 * 2); // a pubkey, and some slack
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
+  dbr = mdb_txn_begin(env, NULL, 0, &txn);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
+  epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
+  tx_active = true;
+
+  MDB_val key = zerokeyval;
+  MDB_val data;
+  data.mv_data = (void*)&output;
+  data.mv_size = sizeof(output);
+
+  switch (op)
+  {
+    case BLACKBALL_BLACKBALL:
+      MDEBUG("Blackballing output " << output);
+      dbr = mdb_put(txn, dbi_blackballs, &key, &data, MDB_NODUPDATA);
+      if (dbr == MDB_KEYEXIST)
+        dbr = 0;
+      break;
+    case BLACKBALL_UNBLACKBALL:
+      MDEBUG("Unblackballing output " << output);
+      dbr = mdb_del(txn, dbi_blackballs, &key, &data);
+      if (dbr == MDB_NOTFOUND)
+        dbr = 0;
+      break;
+    case BLACKBALL_QUERY:
+      dbr = mdb_cursor_open(txn, dbi_blackballs, &cursor);
+      THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create cursor for blackballs table: " + std::string(mdb_strerror(dbr)));
+      dbr = mdb_cursor_get(cursor, &key, &data, MDB_GET_BOTH);
+      THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to lookup in blackballs table: " + std::string(mdb_strerror(dbr)));
+      ret = dbr != MDB_NOTFOUND;
+      if (dbr == MDB_NOTFOUND)
+        dbr = 0;
+      mdb_cursor_close(cursor);
+      break;
+    case BLACKBALL_CLEAR:
+      dbr = mdb_drop(txn, dbi_blackballs, 0);
+      break;
+    default:
+      THROW_WALLET_EXCEPTION(tools::error::wallet_internal_error, "Invalid blackball op");
+  }
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to query blackballs table: " + std::string(mdb_strerror(dbr)));
+
+  dbr = mdb_txn_commit(txn);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn blackballing output to database: " + std::string(mdb_strerror(dbr)));
+  tx_active = false;
+  return ret;
 }
 
-bool unblackball(const std::string &filename, const crypto::public_key &output)
+bool ringdb::blackball(const crypto::public_key &output)
 {
-  return blackball_worker(filename, output, BLACKBALL_UNBLACKBALL);
+  return blackball_worker(output, BLACKBALL_BLACKBALL);
 }
 
-bool blackballed(const std::string &filename, const crypto::public_key &output)
+bool ringdb::unblackball(const crypto::public_key &output)
 {
-  return blackball_worker(filename, output, BLACKBALL_QUERY);
+  return blackball_worker(output, BLACKBALL_UNBLACKBALL);
 }
 
-bool clear_blackballs(const std::string &filename)
+bool ringdb::blackballed(const crypto::public_key &output)
 {
-  return blackball_worker(filename, crypto::public_key(), BLACKBALL_CLEAR);
+  return blackball_worker(output, BLACKBALL_QUERY);
 }
 
-}}
+bool ringdb::clear_blackballs()
+{
+  return blackball_worker(crypto::public_key(), BLACKBALL_CLEAR);
+}
+
+}
diff --git a/src/wallet/ringdb.h b/src/wallet/ringdb.h
index 5aea47075..351ae5a2b 100644
--- a/src/wallet/ringdb.h
+++ b/src/wallet/ringdb.h
@@ -30,21 +30,35 @@
 
 #include <string>
 #include <vector>
+#include <lmdb.h>
 #include "wipeable_string.h"
 #include "crypto/crypto.h"
 #include "cryptonote_basic/cryptonote_basic.h"
 
 namespace tools
 {
-  namespace ringdb
+  class ringdb
   {
-    bool add_rings(const std::string &filename, const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
-    bool remove_rings(const std::string &filename, const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
-    bool get_ring(const std::string &filename, const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
+  public:
+    ringdb(std::string filename);
+    ~ringdb();
 
-    bool blackball(const std::string &filename, const crypto::public_key &output);
-    bool unblackball(const std::string &filename, const crypto::public_key &output);
-    bool blackballed(const std::string &filename, const crypto::public_key &output);
-    bool clear_blackballs(const std::string &filename);
-  }
+    bool add_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
+    bool remove_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
+    bool get_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
+
+    bool blackball(const crypto::public_key &output);
+    bool unblackball(const crypto::public_key &output);
+    bool blackballed(const crypto::public_key &output);
+    bool clear_blackballs();
+
+  private:
+    bool blackball_worker(const crypto::public_key &output, int op);
+
+  private:
+    std::string filename;
+    MDB_env *env;
+    MDB_dbi dbi_rings;
+    MDB_dbi dbi_blackballs;
+  };
 }
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 9cdb842ca..732dc0789 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -675,7 +675,12 @@ wallet2::wallet2(network_type nettype, bool restricted):
   m_light_wallet_balance(0),
   m_light_wallet_unlocked_balance(0),
   m_key_on_device(false),
-  m_ring_history_saved(false)
+  m_ring_history_saved(false),
+  m_ringdb()
+{
+}
+
+wallet2::~wallet2()
 {
 }
 
@@ -1520,7 +1525,7 @@ void wallet2::process_outgoing(const crypto::hash &txid, const cryptonote::trans
   entry.first->second.m_timestamp = ts;
   entry.first->second.m_unlock_time = tx.unlock_time;
 
-  add_rings(get_ring_database(), tx);
+  add_rings(tx);
 }
 //----------------------------------------------------------------------------------------------------
 void wallet2::process_new_blockchain_entry(const cryptonote::block& b, const cryptonote::block_complete_entry& bche, const crypto::hash& bl_id, uint64_t height, const cryptonote::COMMAND_RPC_GET_BLOCKS_FAST::block_output_indices &o_indices)
@@ -1891,7 +1896,7 @@ void wallet2::update_pool_state(bool refreshed)
         pit->second.m_state = wallet2::unconfirmed_transfer_details::failed;
 
         // the inputs aren't spent anymore, since the tx failed
-        remove_rings(m_ring_database, pit->second.m_tx);
+        remove_rings(pit->second.m_tx);
         for (size_t vini = 0; vini < pit->second.m_tx.vin.size(); ++vini)
         {
           if (pit->second.m_tx.vin[vini].type() == typeid(txin_to_key))
@@ -3793,7 +3798,7 @@ void wallet2::load(const std::string& wallet_, const epee::wipeable_string& pass
 
   try
   {
-    find_and_save_rings(get_ring_database(), false);
+    find_and_save_rings(false);
   }
   catch (const std::exception &e)
   {
@@ -4540,7 +4545,7 @@ void wallet2::commit_tx(pending_tx& ptx)
     m_additional_tx_keys.insert(std::make_pair(txid, ptx.additional_tx_keys));
   }
 
-  add_rings(m_ring_database, ptx.tx);
+  add_rings(ptx.tx);
 
   LOG_PRINT_L2("transaction " << txid << " generated ok and sent to daemon, key_images: [" << ptx.key_images << "]");
 
@@ -5448,44 +5453,55 @@ void wallet2::set_ring_database(const std::string &filename)
 {
   m_ring_database = filename;
   MINFO("ringdb path set to " << filename);
+  m_ringdb.reset();
+  if (!m_ring_database.empty())
+    m_ringdb.reset(new tools::ringdb(m_ring_database));
 }
 
-bool wallet2::add_rings(const std::string &filename, const crypto::chacha_key &key, const cryptonote::transaction_prefix &tx)
+bool wallet2::add_rings(const crypto::chacha_key &key, const cryptonote::transaction_prefix &tx)
 {
-  return ringdb::add_rings(filename, key, tx);
+  if (!m_ringdb)
+    return true;
+  return m_ringdb->add_rings(key, tx);
 }
 
-bool wallet2::add_rings(const std::string &filename, const cryptonote::transaction_prefix &tx)
+bool wallet2::add_rings(const cryptonote::transaction_prefix &tx)
 {
   crypto::chacha_key key;
   generate_chacha_key_from_secret_keys(key);
-  return add_rings(filename, key, tx);
+  return add_rings(key, tx);
 }
 
-bool wallet2::remove_rings(const std::string &filename, const cryptonote::transaction_prefix &tx)
+bool wallet2::remove_rings(const cryptonote::transaction_prefix &tx)
 {
+  if (!m_ringdb)
+    return true;
   crypto::chacha_key key;
   generate_chacha_key_from_secret_keys(key);
-  return ringdb::remove_rings(filename, key, tx);
+  return m_ringdb->remove_rings(key, tx);
 }
 
-bool wallet2::get_ring(const std::string &filename, const crypto::chacha_key &key, const crypto::key_image &key_image, std::vector<uint64_t> &outs)
+bool wallet2::get_ring(const crypto::chacha_key &key, const crypto::key_image &key_image, std::vector<uint64_t> &outs)
 {
-  return ringdb::get_ring(filename, key, key_image, outs);
+  if (!m_ringdb)
+    return true;
+  return m_ringdb->get_ring(key, key_image, outs);
 }
 
-bool wallet2::get_ring(const std::string &filename, const crypto::key_image &key_image, std::vector<uint64_t> &outs)
+bool wallet2::get_ring(const crypto::key_image &key_image, std::vector<uint64_t> &outs)
 {
   crypto::chacha_key key;
   generate_chacha_key_from_secret_keys(key);
 
-  return get_ring(filename, key, key_image, outs);
+  return get_ring(key, key_image, outs);
 }
 
-bool wallet2::find_and_save_rings(const std::string &filename, bool force)
+bool wallet2::find_and_save_rings(bool force)
 {
   if (!force && m_ring_history_saved)
     return true;
+  if (!m_ringdb)
+    return true;
 
   COMMAND_RPC_GET_TRANSACTIONS::request req = AUTO_VAL_INIT(req);
   COMMAND_RPC_GET_TRANSACTIONS::response res = AUTO_VAL_INIT(res);
@@ -5533,7 +5549,7 @@ bool wallet2::find_and_save_rings(const std::string &filename, bool force)
     crypto::hash tx_hash, tx_prefix_hash;
     THROW_WALLET_EXCEPTION_IF(!cryptonote::parse_and_validate_tx_from_blob(bd, tx, tx_hash, tx_prefix_hash), error::wallet_internal_error, "failed to parse tx from blob");
     THROW_WALLET_EXCEPTION_IF(epee::string_tools::pod_to_hex(tx_hash) != tx_info.tx_hash, error::wallet_internal_error, "txid mismatch");
-    THROW_WALLET_EXCEPTION_IF(!add_rings(filename, key, tx), error::wallet_internal_error, "Failed to save ring");
+    THROW_WALLET_EXCEPTION_IF(!add_rings(key, tx), error::wallet_internal_error, "Failed to save ring");
   }
 
   MINFO("Found and saved rings for " << res.txs.size() << " transactions");
@@ -5543,27 +5559,35 @@ bool wallet2::find_and_save_rings(const std::string &filename, bool force)
 
 bool wallet2::blackball_output(const crypto::public_key &output)
 {
-  return ringdb::blackball(get_ring_database(), output);
+  if (!m_ringdb)
+    return true;
+  return m_ringdb->blackball(output);
 }
 
 bool wallet2::set_blackballed_outputs(const std::vector<crypto::public_key> &outputs, bool add)
 {
+  if (!m_ringdb)
+    return true;
   bool ret = true;
   if (!add)
-    ret &= ringdb::clear_blackballs(get_ring_database());
+    ret &= m_ringdb->clear_blackballs();
   for (const auto &output: outputs)
-    ret &= ringdb::blackball(get_ring_database(), output);
+    ret &= m_ringdb->blackball(output);
   return ret;
 }
 
 bool wallet2::unblackball_output(const crypto::public_key &output)
 {
-  return ringdb::unblackball(get_ring_database(), output);
+  if (!m_ringdb)
+    return true;
+  return m_ringdb->unblackball(output);
 }
 
 bool wallet2::is_output_blackballed(const crypto::public_key &output) const
 {
-  return ringdb::blackballed(get_ring_database(), output);
+  if (!m_ringdb)
+    return true;
+  return m_ringdb->blackballed(output);
 }
 
 bool wallet2::tx_add_fake_output(std::vector<std::vector<tools::wallet2::get_outs_entry>> &outs, uint64_t global_index, const crypto::public_key& output_public_key, const rct::key& mask, uint64_t real_index, bool unlocked) const
@@ -5880,7 +5904,7 @@ void wallet2::get_outs(std::vector<std::vector<tools::wallet2::get_outs_entry>>
       if (td.m_key_image_known && !td.m_key_image_partial)
       {
         std::vector<uint64_t> ring;
-        if (get_ring(get_ring_database(), key, td.m_key_image, ring))
+        if (get_ring(key, td.m_key_image, ring))
         {
           MINFO("This output has a known ring, reusing (size " << ring.size() << ")");
           THROW_WALLET_EXCEPTION_IF(ring.size() > fake_outputs_count + 1, error::wallet_internal_error,
@@ -6072,7 +6096,7 @@ void wallet2::get_outs(std::vector<std::vector<tools::wallet2::get_outs_entry>>
       if (td.m_key_image_known && !td.m_key_image_partial)
       {
         std::vector<uint64_t> ring;
-        if (get_ring(get_ring_database(), key, td.m_key_image, ring))
+        if (get_ring(key, td.m_key_image, ring))
         {
           for (uint64_t out: ring)
           {
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index e446da3fd..c62bdbfc8 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -66,6 +66,8 @@ class Serialization_portability_wallet_Test;
 
 namespace tools
 {
+  class ringdb;
+
   class i_wallet2_callback
   {
   public:
@@ -166,6 +168,7 @@ namespace tools
     static bool verify_password(const std::string& keys_file_name, const epee::wipeable_string& password, bool no_spend_key, hw::device &hwdev);
 
     wallet2(cryptonote::network_type nettype = cryptonote::MAINNET, bool restricted = false);
+    ~wallet2();
 
     struct multisig_info
     {
@@ -1055,8 +1058,8 @@ namespace tools
 
     void set_ring_database(const std::string &filename);
     const std::string get_ring_database() const { return m_ring_database; }
-    bool get_ring(const std::string &filename, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
-    bool find_and_save_rings(const std::string &filename, bool force = true);
+    bool get_ring(const crypto::key_image &key_image, std::vector<uint64_t> &outs);
+    bool find_and_save_rings(bool force = true);
 
     bool blackball_output(const crypto::public_key &output);
     bool set_blackballed_outputs(const std::vector<crypto::public_key> &outputs, bool add = false);
@@ -1119,10 +1122,10 @@ namespace tools
     rct::multisig_kLRki get_multisig_kLRki(size_t n, const rct::key &k) const;
     rct::key get_multisig_k(size_t idx, const std::unordered_set<rct::key> &used_L) const;
     void update_multisig_rescan_info(const std::vector<std::vector<rct::key>> &multisig_k, const std::vector<std::vector<tools::wallet2::multisig_info>> &info, size_t n);
-    bool add_rings(const std::string &filename, const crypto::chacha_key &key, const cryptonote::transaction_prefix &tx);
-    bool add_rings(const std::string &filename, const cryptonote::transaction_prefix &tx);
-    bool remove_rings(const std::string &filename, const cryptonote::transaction_prefix &tx);
-    bool get_ring(const std::string &filename, const crypto::chacha_key &key, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
+    bool add_rings(const crypto::chacha_key &key, const cryptonote::transaction_prefix &tx);
+    bool add_rings(const cryptonote::transaction_prefix &tx);
+    bool remove_rings(const cryptonote::transaction_prefix &tx);
+    bool get_ring(const crypto::chacha_key &key, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
 
     bool get_output_distribution(uint64_t &start_height, std::vector<uint64_t> &distribution);
 
@@ -1213,6 +1216,7 @@ namespace tools
 
     std::string m_ring_database;
     bool m_ring_history_saved;
+    std::unique_ptr<ringdb> m_ringdb;
   };
 }
 BOOST_CLASS_VERSION(tools::wallet2, 24)