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db_lmdb: speedup the get_output_distribution common case

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moneromooo-monero 2018-08-16 18:16:36 +00:00
parent 76affd941b
commit dc6c0696fd
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1 changed files with 13 additions and 2 deletions
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15
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -1971,14 +1971,25 @@ std::vector<uint64_t> BlockchainLMDB::get_block_cumulative_rct_outputs(const std
MDB_val v;
uint64_t prev_height = heights[0];
for (uint64_t height: heights)
{
MDB_val_set(v, 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);
}
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 (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;
res.push_back(bi->bi_cum_rct);
prev_height = height;
}
TXN_POSTFIX_RDONLY();