ArticMine's new block weight algorithm

This curbs runaway growth while still allowing substantial
spikes in block weight

Original specification from ArticMine:

here is the scaling proposal
Define: LongTermBlockWeight
Before fork:
LongTermBlockWeight = BlockWeight
At or after fork:
LongTermBlockWeight = min(BlockWeight, 1.4*LongTermEffectiveMedianBlockWeight)
Note: To avoid possible consensus issues over rounding the LongTermBlockWeight for a given block should be calculated to the nearest byte, and stored as a integer in the block itself. The stored LongTermBlockWeight is then used for future calculations of the LongTermEffectiveMedianBlockWeight and not recalculated each time.
Define:   LongTermEffectiveMedianBlockWeight
LongTermEffectiveMedianBlockWeight = max(300000, MedianOverPrevious100000Blocks(LongTermBlockWeight))
Change Definition of EffectiveMedianBlockWeight
From (current definition)
EffectiveMedianBlockWeight  = max(300000, MedianOverPrevious100Blocks(BlockWeight))
To (proposed definition)
EffectiveMedianBlockWeight  = min(max(300000, MedianOverPrevious100Blocks(BlockWeight)), 50*LongTermEffectiveMedianBlockWeight)
Notes:
1) There are no other changes to the existing penalty formula, median calculation, fees etc.
2) There is the requirement to store the LongTermBlockWeight of a block unencrypted in the block itself. This  is to avoid possible consensus issues over rounding and also to prevent the calculations from becoming unwieldy as we move away from the fork.
3) When the  EffectiveMedianBlockWeight cap is reached it is still possible to mine blocks up to 2x the EffectiveMedianBlockWeight by paying the corresponding penalty.

Note: the long term block weight is stored in the database, but not in the actual block itself,
since it requires recalculating anyway for verification.

5 files changed, 384 insertions, 8 deletions

diff --git a/src/blockchain_db/blockchain_db.cpp b/src/blockchain_db/blockchain_db.cpp
index d3eefef6e..041759593 100644
--- a/src/blockchain_db/blockchain_db.cpp
+++ b/src/blockchain_db/blockchain_db.cpp
@@ -197,6 +197,7 @@ void BlockchainDB::add_transaction(const crypto::hash& blk_hash, const transacti
 
 uint64_t BlockchainDB::add_block( const block& blk
                                 , size_t block_weight
+                                , uint64_t long_term_block_weight
                                 , const difficulty_type& cumulative_difficulty
                                 , const uint64_t& coins_generated
                                 , const std::vector<transaction>& txs
@@ -241,7 +242,7 @@ uint64_t BlockchainDB::add_block( const block& blk
 
   // call out to subclass implementation to add the block & metadata
   time1 = epee::misc_utils::get_tick_count();
-  add_block(blk, block_weight, cumulative_difficulty, coins_generated, num_rct_outs, blk_hash);
+  add_block(blk, block_weight, long_term_block_weight, cumulative_difficulty, coins_generated, num_rct_outs, blk_hash);
   TIME_MEASURE_FINISH(time1);
   time_add_block1 += time1;
 
diff --git a/src/blockchain_db/blockchain_db.h b/src/blockchain_db/blockchain_db.h
index 137d5958a..c3f11ba28 100644
--- a/src/blockchain_db/blockchain_db.h
+++ b/src/blockchain_db/blockchain_db.h
@@ -358,12 +358,14 @@ private:
    *
    * @param blk the block to be added
    * @param block_weight the weight of the block (transactions and all)
+   * @param long_term_block_weight the long term block weight of the block (transactions and all)
    * @param cumulative_difficulty the accumulated difficulty after this block
    * @param coins_generated the number of coins generated total after this block
    * @param blk_hash the hash of the block
    */
   virtual void add_block( const block& blk
                 , size_t block_weight
+                , uint64_t long_term_block_weight
                 , const difficulty_type& cumulative_difficulty
                 , const uint64_t& coins_generated
                 , uint64_t num_rct_outs
@@ -375,7 +377,7 @@ private:
    *
    * The subclass implementing this will remove the block data from the top
    * block in the chain.  The data to be removed is that which was added in
-   * BlockchainDB::add_block(const block& blk, size_t block_weight, const difficulty_type& cumulative_difficulty, const uint64_t& coins_generated, const crypto::hash& blk_hash)
+   * BlockchainDB::add_block(const block& blk, size_t block_weight, uint64_t long_term_block_weight, const difficulty_type& cumulative_difficulty, const uint64_t& coins_generated, const crypto::hash& blk_hash)
    *
    * If any of this cannot be done, the subclass should throw the corresponding
    * subclass of DB_EXCEPTION
@@ -789,6 +791,7 @@ public:
    *
    * @param blk the block to be added
    * @param block_weight the size of the block (transactions and all)
+   * @param long_term_block_weight the long term weight of the block (transactions and all)
    * @param cumulative_difficulty the accumulated difficulty after this block
    * @param coins_generated the number of coins generated total after this block
    * @param txs the transactions in the block
@@ -797,6 +800,7 @@ public:
    */
   virtual uint64_t add_block( const block& blk
                             , size_t block_weight
+                            , uint64_t long_term_block_weight
                             , const difficulty_type& cumulative_difficulty
                             , const uint64_t& coins_generated
                             , const std::vector<transaction>& txs
@@ -985,6 +989,17 @@ public:
   virtual uint64_t get_block_already_generated_coins(const uint64_t& height) const = 0;
 
   /**
+   * @brief fetch a block's long term weight
+   *
+   * If the block does not exist, the subclass should throw BLOCK_DNE
+   *
+   * @param height the height requested
+   *
+   * @return the long term weight
+   */
+  virtual uint64_t get_block_long_term_weight(const uint64_t& height) const = 0;
+
+  /**
    * @brief fetch a block's hash
    *
    * The subclass should return hash of the block with the
diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index 8a1303be9..00912a447 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -29,6 +29,7 @@
 
 #include <boost/filesystem.hpp>
 #include <boost/format.hpp>
+#include <boost/circular_buffer.hpp>
 #include <memory>  // std::unique_ptr
 #include <cstring>  // memcpy
 
@@ -53,7 +54,7 @@ using epee::string_tools::pod_to_hex;
 using namespace crypto;
 
 // Increase when the DB structure changes
-#define VERSION 3
+#define VERSION 4
 
 namespace
 {
@@ -277,7 +278,7 @@ typedef struct mdb_block_info_old
   crypto::hash bi_hash;
 } mdb_block_info_old;
 
-typedef struct mdb_block_info
+typedef struct mdb_block_info_2
 {
   uint64_t bi_height;
   uint64_t bi_timestamp;
@@ -286,7 +287,21 @@ typedef struct mdb_block_info
   difficulty_type bi_diff;
   crypto::hash bi_hash;
   uint64_t bi_cum_rct;
-} mdb_block_info;
+} mdb_block_info_2;
+
+typedef struct mdb_block_info_3
+{
+  uint64_t bi_height;
+  uint64_t bi_timestamp;
+  uint64_t bi_coins;
+  uint64_t bi_weight; // a size_t really but we need 32-bit compat
+  difficulty_type bi_diff;
+  crypto::hash bi_hash;
+  uint64_t bi_cum_rct;
+  uint64_t bi_long_term_block_weight;
+} mdb_block_info_3;
+
+typedef mdb_block_info_3 mdb_block_info;
 
 typedef struct blk_height {
     crypto::hash bh_hash;
@@ -694,7 +709,7 @@ estim:
   return threshold_size;
 }
 
-void BlockchainLMDB::add_block(const block& blk, size_t block_weight, const difficulty_type& cumulative_difficulty, const uint64_t& coins_generated,
+void BlockchainLMDB::add_block(const block& blk, size_t block_weight, uint64_t long_term_block_weight, const difficulty_type& cumulative_difficulty, const uint64_t& coins_generated,
     uint64_t num_rct_outs, const crypto::hash& blk_hash)
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
@@ -754,6 +769,7 @@ void BlockchainLMDB::add_block(const block& blk, size_t block_weight, const diff
     const mdb_block_info *bi_prev = (const mdb_block_info*)h.mv_data;
     bi.bi_cum_rct += bi_prev->bi_cum_rct;
   }
+  bi.bi_long_term_block_weight = long_term_block_weight;
 
   MDB_val_set(val, bi);
   result = mdb_cursor_put(m_cur_block_info, (MDB_val *)&zerokval, &val, MDB_APPENDDUP);
@@ -2486,6 +2502,29 @@ uint64_t BlockchainLMDB::get_block_already_generated_coins(const uint64_t& heigh
   return ret;
 }
 
+uint64_t BlockchainLMDB::get_block_long_term_weight(const uint64_t& height) const
+{
+  LOG_PRINT_L3("BlockchainLMDB::" << __func__);
+  check_open();
+
+  TXN_PREFIX_RDONLY();
+  RCURSOR(block_info);
+
+  MDB_val_set(result, height);
+  auto get_result = mdb_cursor_get(m_cur_block_info, (MDB_val *)&zerokval, &result, MDB_GET_BOTH);
+  if (get_result == MDB_NOTFOUND)
+  {
+    throw0(BLOCK_DNE(std::string("Attempt to get block long term weight from height ").append(boost::lexical_cast<std::string>(height)).append(" failed -- block info not in db").c_str()));
+  }
+  else if (get_result)
+    throw0(DB_ERROR("Error attempting to retrieve a long term block weight from the db"));
+
+  mdb_block_info *bi = (mdb_block_info *)result.mv_data;
+  uint64_t ret = bi->bi_long_term_block_weight;
+  TXN_POSTFIX_RDONLY();
+  return ret;
+}
+
 crypto::hash BlockchainLMDB::get_block_hash_from_height(const uint64_t& height) const
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
@@ -3524,7 +3563,7 @@ void BlockchainLMDB::block_txn_abort()
   }
 }
 
-uint64_t BlockchainLMDB::add_block(const block& blk, size_t block_weight, const difficulty_type& cumulative_difficulty, const uint64_t& coins_generated,
+uint64_t BlockchainLMDB::add_block(const block& blk, size_t block_weight, uint64_t long_term_block_weight, const difficulty_type& cumulative_difficulty, const uint64_t& coins_generated,
     const std::vector<transaction>& txs)
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
@@ -3543,7 +3582,7 @@ uint64_t BlockchainLMDB::add_block(const block& blk, size_t block_weight, const
 
   try
   {
-    BlockchainDB::add_block(blk, block_weight, cumulative_difficulty, coins_generated, txs);
+    BlockchainDB::add_block(blk, block_weight, long_term_block_weight, cumulative_difficulty, coins_generated, txs);
   }
   catch (const DB_ERROR_TXN_START& e)
   {
@@ -4768,6 +4807,166 @@ void BlockchainLMDB::migrate_2_3()
   txn.commit();
 }
 
+void BlockchainLMDB::migrate_3_4()
+{
+  LOG_PRINT_L3("BlockchainLMDB::" << __func__);
+  uint64_t i;
+  int result;
+  mdb_txn_safe txn(false);
+  MDB_val k, v;
+  char *ptr;
+  bool past_long_term_weight = false;
+
+  MGINFO_YELLOW("Migrating blockchain from DB version 3 to 4 - this may take a while:");
+
+  do {
+    LOG_PRINT_L1("migrating block info:");
+
+    result = mdb_txn_begin(m_env, NULL, 0, txn);
+    if (result)
+      throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", result).c_str()));
+
+    MDB_stat db_stats;
+    if ((result = mdb_stat(txn, m_blocks, &db_stats)))
+      throw0(DB_ERROR(lmdb_error("Failed to query m_blocks: ", result).c_str()));
+    const uint64_t blockchain_height = db_stats.ms_entries;
+
+    boost::circular_buffer<uint64_t> long_term_block_weights(CRYPTONOTE_LONG_TERM_BLOCK_WEIGHT_WINDOW_SIZE);
+
+    /* the block_info table name is the same but the old version and new version
+     * have incompatible data. Create a new table. We want the name to be similar
+     * to the old name so that it will occupy the same location in the DB.
+     */
+    MDB_dbi o_block_info = m_block_info;
+    lmdb_db_open(txn, "block_infn", MDB_INTEGERKEY | MDB_CREATE | MDB_DUPSORT | MDB_DUPFIXED, m_block_info, "Failed to open db handle for block_infn");
+    mdb_set_dupsort(txn, m_block_info, compare_uint64);
+
+
+    MDB_cursor *c_blocks;
+    result = mdb_cursor_open(txn, m_blocks, &c_blocks);
+    if (result)
+      throw0(DB_ERROR(lmdb_error("Failed to open a cursor for blocks: ", result).c_str()));
+
+    MDB_cursor *c_old, *c_cur;
+    i = 0;
+    while(1) {
+      if (!(i % 1000)) {
+        if (i) {
+          LOGIF(el::Level::Info) {
+            std::cout << i << " / " << blockchain_height << "  \r" << std::flush;
+          }
+          txn.commit();
+          result = mdb_txn_begin(m_env, NULL, 0, txn);
+          if (result)
+            throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", result).c_str()));
+        }
+        result = mdb_cursor_open(txn, m_block_info, &c_cur);
+        if (result)
+          throw0(DB_ERROR(lmdb_error("Failed to open a cursor for block_infn: ", result).c_str()));
+        result = mdb_cursor_open(txn, o_block_info, &c_old);
+        if (result)
+          throw0(DB_ERROR(lmdb_error("Failed to open a cursor for block_info: ", result).c_str()));
+        result = mdb_cursor_open(txn, m_blocks, &c_blocks);
+        if (result)
+          throw0(DB_ERROR(lmdb_error("Failed to open a cursor for blocks: ", result).c_str()));
+        if (!i) {
+          MDB_stat db_stat;
+          result = mdb_stat(txn, m_block_info, &db_stats);
+          if (result)
+            throw0(DB_ERROR(lmdb_error("Failed to query m_block_info: ", result).c_str()));
+          i = db_stats.ms_entries;
+        }
+      }
+      result = mdb_cursor_get(c_old, &k, &v, MDB_NEXT);
+      if (result == MDB_NOTFOUND) {
+        txn.commit();
+        break;
+      }
+      else if (result)
+        throw0(DB_ERROR(lmdb_error("Failed to get a record from block_info: ", result).c_str()));
+      const mdb_block_info_2 *bi_old = (const mdb_block_info_2*)v.mv_data;
+      mdb_block_info_3 bi;
+      bi.bi_height = bi_old->bi_height;
+      bi.bi_timestamp = bi_old->bi_timestamp;
+      bi.bi_coins = bi_old->bi_coins;
+      bi.bi_weight = bi_old->bi_weight;
+      bi.bi_diff = bi_old->bi_diff;
+      bi.bi_hash = bi_old->bi_hash;
+      bi.bi_cum_rct = bi_old->bi_cum_rct;
+
+      // get block major version to determine which rule is in place
+      if (!past_long_term_weight)
+      {
+        MDB_val_copy<uint64_t> kb(bi.bi_height);
+        MDB_val vb;
+        result = mdb_cursor_get(c_blocks, &kb, &vb, MDB_SET);
+        if (result)
+          throw0(DB_ERROR(lmdb_error("Failed to query m_blocks: ", result).c_str()));
+        if (vb.mv_size == 0)
+          throw0(DB_ERROR("Invalid data from m_blocks"));
+        const uint8_t block_major_version = *((const uint8_t*)vb.mv_data);
+        if (block_major_version >= HF_VERSION_LONG_TERM_BLOCK_WEIGHT)
+          past_long_term_weight = true;
+      }
+
+      uint64_t long_term_block_weight;
+      if (past_long_term_weight)
+      {
+        std::vector<uint64_t> weights(long_term_block_weights.begin(), long_term_block_weights.end());
+        uint64_t long_term_effective_block_median_weight = std::max<uint64_t>(CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5, epee::misc_utils::median(weights));
+        long_term_block_weight = std::min<uint64_t>(bi.bi_weight, long_term_effective_block_median_weight + long_term_effective_block_median_weight * 2 / 5);
+      }
+      else
+      {
+        long_term_block_weight = bi.bi_weight;
+      }
+      long_term_block_weights.push_back(long_term_block_weight);
+      bi.bi_long_term_block_weight = long_term_block_weight;
+
+      MDB_val_set(nv, bi);
+      result = mdb_cursor_put(c_cur, (MDB_val *)&zerokval, &nv, MDB_APPENDDUP);
+      if (result)
+        throw0(DB_ERROR(lmdb_error("Failed to put a record into block_infn: ", result).c_str()));
+      /* we delete the old records immediately, so the overall DB and mapsize should not grow.
+       * This is a little slower than just letting mdb_drop() delete it all at the end, but
+       * it saves a significant amount of disk space.
+       */
+      result = mdb_cursor_del(c_old, 0);
+      if (result)
+        throw0(DB_ERROR(lmdb_error("Failed to delete a record from block_info: ", result).c_str()));
+      i++;
+    }
+
+    result = mdb_txn_begin(m_env, NULL, 0, txn);
+    if (result)
+      throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", result).c_str()));
+    /* Delete the old table */
+    result = mdb_drop(txn, o_block_info, 1);
+    if (result)
+      throw0(DB_ERROR(lmdb_error("Failed to delete old block_info table: ", result).c_str()));
+
+    RENAME_DB("block_infn");
+    mdb_dbi_close(m_env, m_block_info);
+
+    lmdb_db_open(txn, "block_info", MDB_INTEGERKEY | MDB_CREATE | MDB_DUPSORT | MDB_DUPFIXED, m_block_info, "Failed to open db handle for block_infn");
+    mdb_set_dupsort(txn, m_block_info, compare_uint64);
+
+    txn.commit();
+  } while(0);
+
+  uint32_t version = 4;
+  v.mv_data = (void *)&version;
+  v.mv_size = sizeof(version);
+  MDB_val_str(vk, "version");
+  result = mdb_txn_begin(m_env, NULL, 0, txn);
+  if (result)
+    throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", result).c_str()));
+  result = mdb_put(txn, m_properties, &vk, &v, 0);
+  if (result)
+    throw0(DB_ERROR(lmdb_error("Failed to update version for the db: ", result).c_str()));
+  txn.commit();
+}
+
 void BlockchainLMDB::migrate(const uint32_t oldversion)
 {
   if (oldversion < 1)
@@ -4776,6 +4975,8 @@ void BlockchainLMDB::migrate(const uint32_t oldversion)
     migrate_1_2();
   if (oldversion < 3)
     migrate_2_3();
+  if (oldversion < 4)
+    migrate_3_4();
 }
 
 }  // namespace cryptonote
diff --git a/src/blockchain_db/lmdb/db_lmdb.h b/src/blockchain_db/lmdb/db_lmdb.h
index c07ab8da5..5764f9ae4 100644
--- a/src/blockchain_db/lmdb/db_lmdb.h
+++ b/src/blockchain_db/lmdb/db_lmdb.h
@@ -225,6 +225,8 @@ public:
 
   virtual uint64_t get_block_already_generated_coins(const uint64_t& height) const;
 
+  virtual uint64_t get_block_long_term_weight(const uint64_t& height) const;
+
   virtual crypto::hash get_block_hash_from_height(const uint64_t& height) const;
 
   virtual std::vector<block> get_blocks_range(const uint64_t& h1, const uint64_t& h2) const;
@@ -292,6 +294,7 @@ public:
 
   virtual uint64_t add_block( const block& blk
                             , size_t block_weight
+                            , uint64_t long_term_block_weight
                             , const difficulty_type& cumulative_difficulty
                             , const uint64_t& coins_generated
                             , const std::vector<transaction>& txs
@@ -341,6 +344,7 @@ private:
 
   virtual void add_block( const block& blk
                 , size_t block_weight
+                , uint64_t long_term_block_weight
                 , const difficulty_type& cumulative_difficulty
                 , const uint64_t& coins_generated
                 , uint64_t num_rct_outs
@@ -405,6 +409,9 @@ private:
   // migrate from DB version 2 to 3
   void migrate_2_3();
 
+  // migrate from DB version 3 to 4
+  void migrate_3_4();
+
   void cleanup_batch();
 
 private:
diff --git a/src/blockchain_db/testdb.h b/src/blockchain_db/testdb.h
new file mode 100644
index 000000000..35dfbe673
--- /dev/null
+++ b/src/blockchain_db/testdb.h
@@ -0,0 +1,152 @@
+// Copyright (c) 2014-2018, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// 
+// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
+
+#pragma once
+
+#include <string>
+#include <vector>
+#include <map>
+
+#include "blockchain_db.h"
+
+namespace cryptonote
+{
+
+class BaseTestDB: public cryptonote::BlockchainDB {
+public:
+  BaseTestDB() {}
+  virtual void open(const std::string& filename, const int db_flags = 0) { }
+  virtual void close() {}
+  virtual void sync() {}
+  virtual void safesyncmode(const bool onoff) {}
+  virtual void reset() {}
+  virtual std::vector<std::string> get_filenames() const { return std::vector<std::string>(); }
+  virtual bool remove_data_file(const std::string& folder) const { return true; }
+  virtual std::string get_db_name() const { return std::string(); }
+  virtual bool lock() { return true; }
+  virtual void unlock() { }
+  virtual bool batch_start(uint64_t batch_num_blocks=0, uint64_t batch_bytes=0) { return true; }
+  virtual void batch_stop() {}
+  virtual void set_batch_transactions(bool) {}
+  virtual void block_txn_start(bool readonly=false) {}
+  virtual void block_txn_stop() {}
+  virtual void block_txn_abort() {}
+  virtual void drop_hard_fork_info() {}
+  virtual bool block_exists(const crypto::hash& h, uint64_t *height) const { return false; }
+  virtual cryptonote::blobdata get_block_blob_from_height(const uint64_t& height) const { return cryptonote::t_serializable_object_to_blob(get_block_from_height(height)); }
+  virtual cryptonote::blobdata get_block_blob(const crypto::hash& h) const { return cryptonote::blobdata(); }
+  virtual bool get_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const { return false; }
+  virtual bool get_pruned_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const { return false; }
+  virtual bool get_prunable_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const { return false; }
+  virtual bool get_prunable_tx_hash(const crypto::hash& tx_hash, crypto::hash &prunable_hash) const { return false; }
+  virtual uint64_t get_block_height(const crypto::hash& h) const { return 0; }
+  virtual cryptonote::block_header get_block_header(const crypto::hash& h) const { return cryptonote::block_header(); }
+  virtual uint64_t get_block_timestamp(const uint64_t& height) const { return 0; }
+  virtual std::vector<uint64_t> get_block_cumulative_rct_outputs(const std::vector<uint64_t> &heights) const { return {}; }
+  virtual uint64_t get_top_block_timestamp() const { return 0; }
+  virtual size_t get_block_weight(const uint64_t& height) const { return 128; }
+  virtual cryptonote::difficulty_type get_block_cumulative_difficulty(const uint64_t& height) const { return 10; }
+  virtual cryptonote::difficulty_type get_block_difficulty(const uint64_t& height) const { return 0; }
+  virtual uint64_t get_block_already_generated_coins(const uint64_t& height) const { return 10000000000; }
+  virtual uint64_t get_block_long_term_weight(const uint64_t& height) const { return 128; }
+  virtual crypto::hash get_block_hash_from_height(const uint64_t& height) const { return crypto::hash(); }
+  virtual std::vector<cryptonote::block> get_blocks_range(const uint64_t& h1, const uint64_t& h2) const { return std::vector<cryptonote::block>(); }
+  virtual std::vector<crypto::hash> get_hashes_range(const uint64_t& h1, const uint64_t& h2) const { return std::vector<crypto::hash>(); }
+  virtual crypto::hash top_block_hash() const { return crypto::hash(); }
+  virtual cryptonote::block get_top_block() const { return cryptonote::block(); }
+  virtual uint64_t height() const { return 1; }
+  virtual bool tx_exists(const crypto::hash& h) const { return false; }
+  virtual bool tx_exists(const crypto::hash& h, uint64_t& tx_index) const { return false; }
+  virtual uint64_t get_tx_unlock_time(const crypto::hash& h) const { return 0; }
+  virtual cryptonote::transaction get_tx(const crypto::hash& h) const { return cryptonote::transaction(); }
+  virtual bool get_tx(const crypto::hash& h, cryptonote::transaction &tx) const { return false; }
+  virtual uint64_t get_tx_count() const { return 0; }
+  virtual std::vector<cryptonote::transaction> get_tx_list(const std::vector<crypto::hash>& hlist) const { return std::vector<cryptonote::transaction>(); }
+  virtual uint64_t get_tx_block_height(const crypto::hash& h) const { return 0; }
+  virtual uint64_t get_num_outputs(const uint64_t& amount) const { return 1; }
+  virtual uint64_t get_indexing_base() const { return 0; }
+  virtual cryptonote::output_data_t get_output_key(const uint64_t& amount, const uint64_t& index, bool include_commitmemt) const { return cryptonote::output_data_t(); }
+  virtual cryptonote::tx_out_index get_output_tx_and_index_from_global(const uint64_t& index) const { return cryptonote::tx_out_index(); }
+  virtual cryptonote::tx_out_index get_output_tx_and_index(const uint64_t& amount, const uint64_t& index) const { return cryptonote::tx_out_index(); }
+  virtual void get_output_tx_and_index(const uint64_t& amount, const std::vector<uint64_t> &offsets, std::vector<cryptonote::tx_out_index> &indices) const {}
+  virtual void get_output_key(const epee::span<const uint64_t> &amounts, const std::vector<uint64_t> &offsets, std::vector<cryptonote::output_data_t> &outputs, bool allow_partial = false) const {}
+  virtual bool can_thread_bulk_indices() const { return false; }
+  virtual std::vector<uint64_t> get_tx_output_indices(const crypto::hash& h) const { return std::vector<uint64_t>(); }
+  virtual std::vector<std::vector<uint64_t>> get_tx_amount_output_indices(const uint64_t tx_index, size_t n_txes) const { return std::vector<std::vector<uint64_t>>(); }
+  virtual bool has_key_image(const crypto::key_image& img) const { return false; }
+  virtual void remove_block() { }
+  virtual uint64_t add_transaction_data(const crypto::hash& blk_hash, const cryptonote::transaction& tx, const crypto::hash& tx_hash, const crypto::hash& tx_prunable_hash) {return 0;}
+  virtual void remove_transaction_data(const crypto::hash& tx_hash, const cryptonote::transaction& tx) {}
+  virtual uint64_t add_output(const crypto::hash& tx_hash, const cryptonote::tx_out& tx_output, const uint64_t& local_index, const uint64_t unlock_time, const rct::key *commitment) {return 0;}
+  virtual void add_tx_amount_output_indices(const uint64_t tx_index, const std::vector<uint64_t>& amount_output_indices) {}
+  virtual void add_spent_key(const crypto::key_image& k_image) {}
+  virtual void remove_spent_key(const crypto::key_image& k_image) {}
+
+  virtual bool for_all_key_images(std::function<bool(const crypto::key_image&)>) const { return true; }
+  virtual bool for_blocks_range(const uint64_t&, const uint64_t&, std::function<bool(uint64_t, const crypto::hash&, const cryptonote::block&)>) const { return true; }
+  virtual bool for_all_transactions(std::function<bool(const crypto::hash&, const cryptonote::transaction&)>, bool pruned) const { return true; }
+  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 { return true; }
+  virtual bool for_all_outputs(uint64_t amount, const std::function<bool(uint64_t height)> &f) const { return true; }
+  virtual bool is_read_only() const { return false; }
+  virtual std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count) const { return std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>>(); }
+  virtual bool get_output_distribution(uint64_t amount, uint64_t from_height, uint64_t to_height, std::vector<uint64_t> &distribution, uint64_t &base) const { return false; }
+
+  virtual void add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const cryptonote::txpool_tx_meta_t& details) {}
+  virtual void update_txpool_tx(const crypto::hash &txid, const cryptonote::txpool_tx_meta_t& details) {}
+  virtual uint64_t get_txpool_tx_count(bool include_unrelayed_txes = true) const { return 0; }
+  virtual bool txpool_has_tx(const crypto::hash &txid) const { return false; }
+  virtual void remove_txpool_tx(const crypto::hash& txid) {}
+  virtual bool get_txpool_tx_meta(const crypto::hash& txid, cryptonote::txpool_tx_meta_t &meta) const { return false; }
+  virtual bool get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd) const { return false; }
+  virtual uint64_t get_database_size() const { return 0; }
+  virtual cryptonote::blobdata get_txpool_tx_blob(const crypto::hash& txid) const { return ""; }
+  virtual bool for_all_txpool_txes(std::function<bool(const crypto::hash&, const cryptonote::txpool_tx_meta_t&, const cryptonote::blobdata*)>, bool include_blob = false, bool include_unrelayed_txes = false) const { return false; }
+
+  virtual void add_block( const cryptonote::block& blk
+                        , size_t block_weight
+                        , uint64_t long_term_block_weight
+                        , const cryptonote::difficulty_type& cumulative_difficulty
+                        , const uint64_t& coins_generated
+                        , uint64_t num_rct_outs
+                        , const crypto::hash& blk_hash
+                        ) { }
+  virtual cryptonote::block get_block_from_height(const uint64_t& height) const { return cryptonote::block(); }
+  virtual void set_hard_fork_version(uint64_t height, uint8_t version) {}
+  virtual uint8_t get_hard_fork_version(uint64_t height) const { return 0; }
+  virtual void check_hard_fork_info() {}
+
+  virtual uint32_t get_blockchain_pruning_seed() const { return 0; }
+  virtual bool prune_blockchain(uint32_t pruning_seed = 0) { return true; }
+  virtual bool update_pruning() { return true; }
+  virtual bool check_pruning() { return true; }
+  virtual void prune_outputs(uint64_t amount) {}
+};
+
+}