1 files changed, 26 insertions, 11 deletions

diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index bd91f308a..1674c40dd 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -1208,7 +1208,7 @@ void BlockchainLMDB::open(const std::string& filename, const int db_flags)
   if (is_hdd_result)
   {
     if (is_hdd_result.value())
-        MCLOG_RED(el::Level::Warning, "global", "The blockchain is on a rotating drive: this will be very slow, use a SSD if possible");
+        MCLOG_RED(el::Level::Warning, "global", "The blockchain is on a rotating drive: this will be very slow, use an SSD if possible");
   }
 
   m_folder = filename;
@@ -1980,22 +1980,36 @@ std::vector<uint64_t> BlockchainLMDB::get_block_cumulative_rct_outputs(const std
   MDB_val v;
 
   uint64_t prev_height = heights[0];
+  uint64_t range_begin = 0, range_end = 0;
   for (uint64_t height: heights)
   {
-    if (height == prev_height + 1)
+    if (height >= range_begin && height < range_end)
     {
-      MDB_val k2;
-      result = mdb_cursor_get(m_cur_block_info, &k2, &v, MDB_NEXT);
+      // nohting to do
     }
     else
     {
-      v.mv_size = sizeof(uint64_t);
-      v.mv_data = (void*)&height;
-      result = mdb_cursor_get(m_cur_block_info, (MDB_val *)&zerokval, &v, MDB_GET_BOTH);
+      if (height == prev_height + 1)
+      {
+        MDB_val k2;
+        result = mdb_cursor_get(m_cur_block_info, &k2, &v, MDB_NEXT_MULTIPLE);
+        range_begin = ((const mdb_block_info*)v.mv_data)->bi_height;
+        range_end = range_begin + v.mv_size / sizeof(mdb_block_info); // whole records please
+        if (height < range_begin || height >= range_end)
+          throw0(DB_ERROR(("Height " + std::to_string(height) + " not included in multuple record range: " + std::to_string(range_begin) + "-" + std::to_string(range_end)).c_str()));
+      }
+      else
+      {
+        v.mv_size = sizeof(uint64_t);
+        v.mv_data = (void*)&height;
+        result = mdb_cursor_get(m_cur_block_info, (MDB_val *)&zerokval, &v, MDB_GET_BOTH);
+        range_begin = height;
+        range_end = range_begin + 1;
+      }
+      if (result)
+        throw0(DB_ERROR(lmdb_error("Error attempting to retrieve rct distribution from the db: ", result).c_str()));
     }
-    if (result)
-      throw0(DB_ERROR(lmdb_error("Error attempting to retrieve rct distribution from the db: ", result).c_str()));
-    const mdb_block_info *bi = (const mdb_block_info *)v.mv_data;
+    const mdb_block_info *bi = ((const mdb_block_info *)v.mv_data) + (height - range_begin);
     res.push_back(bi->bi_cum_rct);
     prev_height = height;
   }
@@ -2485,7 +2499,8 @@ output_data_t BlockchainLMDB::get_output_key(const uint64_t& amount, const uint6
   MDB_val_set(v, index);
   auto get_result = mdb_cursor_get(m_cur_output_amounts, &k, &v, MDB_GET_BOTH);
   if (get_result == MDB_NOTFOUND)
-    throw1(OUTPUT_DNE("Attempting to get output pubkey by index, but key does not exist"));
+    throw1(OUTPUT_DNE(std::string("Attempting to get output pubkey by index, but key does not exist: amount " +
+        std::to_string(amount) + ", index " + std::to_string(index)).c_str()));
   else if (get_result)
     throw0(DB_ERROR("Error attempting to retrieve an output pubkey from the db"));