blockchain_db: remove unused get_output_key variant

It was actually incorrect, as it would not return commitment

src/blockchain_db/berkeleydb/db_bdb.h

@@ -303,7 +303,6 @@ public:
   virtual uint64_t get_indexing_base() const { return 1; }
 
   virtual output_data_t get_output_key(const uint64_t& amount, const uint64_t& index);
-  virtual output_data_t get_output_key(const uint64_t& global_index) const;
   virtual void get_output_key(const uint64_t &amount, const std::vector<uint64_t> &offsets, std::vector<output_data_t> &outputs);
 
   virtual tx_out_index get_output_tx_and_index_from_global(const uint64_t& index) const;
@@ -419,6 +418,7 @@ private:
    * @return the global index of the desired output
    */
   uint64_t get_output_global_index(const uint64_t& amount, const uint64_t& index);
+  output_data_t get_output_key(const uint64_t& global_index) const;
   void checkpoint_worker() const;
   void check_open() const;
 

src/blockchain_db/blockchain_db.h

@@ -1261,23 +1261,6 @@ public:
    */
   virtual output_data_t get_output_key(const uint64_t& amount, const uint64_t& index) = 0;
 
-  /**
-   * @brief get some of an output's data
-   *
-   * The subclass should return the public key, unlock time, and block height
-   * for the output with the given global index, collected in a struct.
-   *
-   * If the output cannot be found, the subclass should throw OUTPUT_DNE.
-   *
-   * If any of these parts cannot be found, but some are, the subclass
-   * should throw DB_ERROR with a message stating as much.
-   *
-   * @param global_index the output's index (global)
-   *
-   * @return the requested output data
-   */
-  virtual output_data_t get_output_key(const uint64_t& global_index) const = 0;
-
   /**
    * @brief gets an output's tx hash and index
    *

src/blockchain_db/lmdb/db_lmdb.cpp

@@ -2454,55 +2454,6 @@ uint64_t BlockchainLMDB::get_num_outputs(const uint64_t& amount) const
   return num_elems;
 }
 
-// This is a lot harder now that we've removed the output_keys index
-output_data_t BlockchainLMDB::get_output_key(const uint64_t &global_index) const
-{
-  LOG_PRINT_L3("BlockchainLMDB::" << __func__ << " (unused version - does nothing)");
-  check_open();
-  TXN_PREFIX_RDONLY();
-  RCURSOR(output_txs);
-  RCURSOR(tx_indices);
-
-  output_data_t od;
-  MDB_val_set(v, global_index);
-  auto get_result = mdb_cursor_get(m_cur_output_txs, (MDB_val *)&zerokval, &v, MDB_GET_BOTH);
-  if (get_result == MDB_NOTFOUND)
-    throw1(OUTPUT_DNE("output with given index not in db"));
-  else if (get_result)
-    throw0(DB_ERROR("DB error attempting to fetch output tx hash"));
-
-  outtx *ot = (outtx *)v.mv_data;
-
-  MDB_val_set(val_h, ot->tx_hash);
-  get_result = mdb_cursor_get(m_cur_tx_indices, (MDB_val *)&zerokval, &val_h, MDB_GET_BOTH);
-  if (get_result)
-    throw0(DB_ERROR(lmdb_error(std::string("DB error attempting to fetch transaction index from hash ") + epee::string_tools::pod_to_hex(ot->tx_hash) + ": ", get_result).c_str()));
-
-  txindex *tip = (txindex *)val_h.mv_data;
-  MDB_val_set(val_tx_id, tip->data.tx_id);
-  MDB_val result;
-  get_result = mdb_cursor_get(m_cur_txs_pruned, &val_tx_id, &result, MDB_SET);
-  if (get_result == MDB_NOTFOUND)
-    throw1(TX_DNE(std::string("tx with hash ").append(epee::string_tools::pod_to_hex(ot->tx_hash)).append(" not found in db").c_str()));
-  else if (get_result)
-    throw0(DB_ERROR(lmdb_error("DB error attempting to fetch tx from hash", get_result).c_str()));
-
-  blobdata bd;
-  bd.assign(reinterpret_cast<char*>(result.mv_data), result.mv_size);
-
-  transaction tx;
-  if (!parse_and_validate_tx_base_from_blob(bd, tx))
-    throw0(DB_ERROR("Failed to parse tx from blob retrieved from the db"));
-
-  const tx_out tx_output = tx.vout[ot->local_index];
-  od.unlock_time = tip->data.unlock_time;
-  od.height = tip->data.block_id;
-  od.pubkey = boost::get<txout_to_key>(tx_output.target).key;
-
-  TXN_POSTFIX_RDONLY();
-  return od;
-}
-
 output_data_t BlockchainLMDB::get_output_key(const uint64_t& amount, const uint64_t& index)
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);

src/blockchain_db/lmdb/db_lmdb.h

@@ -243,7 +243,6 @@ public:
   virtual uint64_t get_num_outputs(const uint64_t& amount) const;
 
   virtual output_data_t get_output_key(const uint64_t& amount, const uint64_t& index);
-  virtual output_data_t get_output_key(const uint64_t& global_index) const;
   virtual void get_output_key(const uint64_t &amount, const std::vector<uint64_t> &offsets, std::vector<output_data_t> &outputs, bool allow_partial = false);
 
   virtual tx_out_index get_output_tx_and_index_from_global(const uint64_t& index) const;

tests/unit_tests/hardfork.cpp

@@ -93,7 +93,6 @@ public:
   virtual uint64_t get_num_outputs(const uint64_t& amount) const { return 1; }
   virtual uint64_t get_indexing_base() const { return 0; }
   virtual output_data_t get_output_key(const uint64_t& amount, const uint64_t& index) { return output_data_t(); }
-  virtual output_data_t get_output_key(const uint64_t& global_index) const { return output_data_t(); }
   virtual tx_out_index get_output_tx_and_index_from_global(const uint64_t& index) const { return tx_out_index(); }
   virtual tx_out_index get_output_tx_and_index(const uint64_t& amount, const uint64_t& index) const { return tx_out_index(); }
   virtual void get_output_tx_and_index(const uint64_t& amount, const std::vector<uint64_t> &offsets, std::vector<tx_out_index> &indices) const {}