db: store cumulative rct output distribution in the db for speed

This gets rid of the temporary precalc cache.

Also make the RPC able to send data back in binary or JSON,
since there can be a lot of data

This bumps the LMDB database format to v3, with migration.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/blockchain_db/blockchain_db.h b/src/blockchain_db/blockchain_db.h
index 564016fc9..a52782b3c 100644
--- a/src/blockchain_db/blockchain_db.h
+++ b/src/blockchain_db/blockchain_db.h
@@ -367,6 +367,7 @@ private:
                 , const size_t& block_size
                 , const difficulty_type& cumulative_difficulty
                 , const uint64_t& coins_generated
+                , uint64_t num_rct_outs
                 , const crypto::hash& blk_hash
                 ) = 0;
 
@@ -892,6 +893,20 @@ public:
   virtual uint64_t get_block_timestamp(const uint64_t& height) const = 0;
 
   /**
+   * @brief fetch a block's cumulative number of rct outputs
+   *
+   * The subclass should return the numer of rct outputs in the blockchain
+   * up to the block with the given height (inclusive).
+   *
+   * If the block does not exist, the subclass should throw BLOCK_DNE
+   *
+   * @param height the height requested
+   *
+   * @return the cumulative number of rct outputs
+   */
+  virtual std::vector<uint64_t> get_block_cumulative_rct_outputs(const std::vector<uint64_t> &heights) const = 0;
+
+  /**
    * @brief fetch the top block's timestamp
    *
    * The subclass should return the timestamp of the most recent block.