blockchain: keep alternative blocks in LMDB

Alternative blocks are cleared on startup unless --keep-alt-blocks
is passed on the command line

1 files changed, 64 insertions, 1 deletions

diff --git a/src/blockchain_db/blockchain_db.h b/src/blockchain_db/blockchain_db.h
index 567be6a65..9cc8aaaaf 100644
--- a/src/blockchain_db/blockchain_db.h
+++ b/src/blockchain_db/blockchain_db.h
@@ -129,6 +129,15 @@ struct tx_data_t
 };
 #pragma pack(pop)
 
+struct alt_block_data_t
+{
+  uint64_t height;
+  uint64_t cumulative_weight;
+  uint64_t cumulative_difficulty_low;
+  uint64_t cumulative_difficulty_high;
+  uint64_t already_generated_coins;
+};
+
 /**
  * @brief a struct containing txpool per transaction metadata
  */
@@ -1528,8 +1537,45 @@ public:
    *
    * @param: sz the block size
    */
-
   virtual void add_max_block_size(uint64_t sz) = 0;
+
+  /**
+   * @brief add a new alternative block
+   *
+   * @param: blkid the block hash
+   * @param: data: the metadata for the block
+   * @param: blob: the block's blob
+   */
+  virtual void add_alt_block(const crypto::hash &blkid, const cryptonote::alt_block_data_t &data, const cryptonote::blobdata &blob) = 0;
+
+  /**
+   * @brief get an alternative block by hash
+   *
+   * @param: blkid the block hash
+   * @param: data: the metadata for the block
+   * @param: blob: the block's blob
+   *
+   * @return true if the block was found in the alternative blocks list, false otherwise
+   */
+  virtual bool get_alt_block(const crypto::hash &blkid, alt_block_data_t *data, cryptonote::blobdata *blob) = 0;
+
+  /**
+   * @brief remove an alternative block
+   *
+   * @param: blkid the block hash
+   */
+  virtual void remove_alt_block(const crypto::hash &blkid) = 0;
+
+  /**
+   * @brief get the number of alternative blocks stored
+   */
+  virtual uint64_t get_alt_block_count() = 0;
+
+  /**
+   * @brief drop all alternative blocks
+   */
+  virtual void drop_alt_blocks() = 0;
+
   /**
    * @brief runs a function over all txpool transactions
    *
@@ -1619,6 +1665,23 @@ public:
   virtual bool for_all_outputs(std::function<bool(uint64_t amount, const crypto::hash &tx_hash, uint64_t height, size_t tx_idx)> f) const = 0;
   virtual bool for_all_outputs(uint64_t amount, const std::function<bool(uint64_t height)> &f) const = 0;
 
+  /**
+   * @brief runs a function over all alternative blocks stored
+   *
+   * The subclass should run the passed function for each alt block it has
+   * stored, passing (blkid, data, blob) as its parameters.
+   *
+   * If any call to the function returns false, the subclass should return
+   * false.  Otherwise, the subclass returns true.
+   *
+   * The subclass should throw DB_ERROR if any of the expected values are
+   * not found.  Current implementations simply return false.
+   *
+   * @param std::function f the function to run
+   *
+   * @return false if the function returns false for any output, otherwise true
+   */
+  virtual bool for_all_alt_blocks(std::function<bool(const crypto::hash &blkid, const alt_block_data_t &data, const cryptonote::blobdata *blob)> f, bool include_blob = false) const = 0;
 
 
   //