tests: add unit tests for get_output_distribution

src/cryptonote_core/blockchain.cpp

@@ -1805,6 +1805,7 @@ bool Blockchain::get_output_distribution(uint64_t amount, uint64_t from_height,
       case STAGENET: start_height = stagenet_hard_forks[3].height; break;
       case TESTNET: start_height = testnet_hard_forks[3].height; break;
       case MAINNET: start_height = mainnet_hard_forks[3].height; break;
+      case FAKECHAIN: start_height = 0; break;
       default: return false;
     }
   }

src/rpc/core_rpc_server.cpp

@@ -2125,7 +2125,7 @@ namespace cryptonote
       const uint64_t req_to_height = req.to_height ? req.to_height : (m_core.get_current_blockchain_height() - 1);
       for (uint64_t amount: req.amounts)
       {
-        auto data = rpc::RpcHandler::get_output_distribution(m_core, amount, req.from_height, req_to_height, req.cumulative);
+        auto data = rpc::RpcHandler::get_output_distribution([this](uint64_t amount, uint64_t from, uint64_t to, uint64_t &start_height, std::vector<uint64_t> &distribution, uint64_t &base) { return m_core.get_output_distribution(amount, from, to, start_height, distribution, base); }, amount, req.from_height, req_to_height, req.cumulative);
         if (!data)
         {
           error_resp.code = CORE_RPC_ERROR_CODE_INTERNAL_ERROR;

src/rpc/daemon_handler.cpp

@@ -751,7 +751,7 @@ namespace rpc
       const uint64_t req_to_height = req.to_height ? req.to_height : (m_core.get_current_blockchain_height() - 1);
       for (std::uint64_t amount : req.amounts)
       {
-        auto data = get_output_distribution(m_core, amount, req.from_height, req_to_height, req.cumulative);
+        auto data = rpc::RpcHandler::get_output_distribution([this](uint64_t amount, uint64_t from, uint64_t to, uint64_t &start_height, std::vector<uint64_t> &distribution, uint64_t &base) { return m_core.get_output_distribution(amount, from, to, start_height, distribution, base); }, amount, req.from_height, req_to_height, req.cumulative);
         if (!data)
         {
           res.distributions.clear();

src/rpc/rpc_handler.cpp

@@ -26,7 +26,7 @@ namespace rpc
   }
 
   boost::optional<output_distribution_data>
-    RpcHandler::get_output_distribution(core& src, std::uint64_t amount, std::uint64_t from_height, std::uint64_t to_height, bool cumulative)
+    RpcHandler::get_output_distribution(const std::function<bool(uint64_t, uint64_t, uint64_t, uint64_t&, std::vector<uint64_t>&, uint64_t&)> &f, uint64_t amount, uint64_t from_height, uint64_t to_height, bool cumulative)
   {
       static struct D
       {
@@ -43,7 +43,7 @@ namespace rpc
 
       std::vector<std::uint64_t> distribution;
       std::uint64_t start_height, base;
-      if (!src.get_output_distribution(amount, from_height, to_height, start_height, distribution, base))
+      if (!f(amount, from_height, to_height, start_height, distribution, base))
         return boost::none;
 
       if (to_height > 0 && to_height >= from_height)

src/rpc/rpc_handler.h

@@ -56,7 +56,7 @@ class RpcHandler
     virtual std::string handle(const std::string& request) = 0;
 
     static boost::optional<output_distribution_data>
-      get_output_distribution(core& src, std::uint64_t amount, std::uint64_t from_height, std::uint64_t to_height, bool cumulative);
+      get_output_distribution(const std::function<bool(uint64_t, uint64_t, uint64_t, uint64_t&, std::vector<uint64_t>&, uint64_t&)> &f, uint64_t amount, uint64_t from_height, uint64_t to_height, bool cumulative);
 };
 
 

tests/unit_tests/CMakeLists.txt

@@ -62,6 +62,7 @@ set(unit_tests_sources
   multiexp.cpp
   multisig.cpp
   notify.cpp
+  output_distribution.cpp
   parse_amount.cpp
   random.cpp
   serialization.cpp

tests/unit_tests/hardfork.cpp

@@ -34,101 +34,19 @@
 #include "blockchain_db/blockchain_db.h"
 #include "cryptonote_basic/cryptonote_format_utils.h"
 #include "cryptonote_basic/hardfork.h"
+#include "testdb.h"
 
 using namespace cryptonote;
 
 #define BLOCKS_PER_YEAR 525960
 #define SECONDS_PER_YEAR 31557600
 
+namespace
+{
 
-class TestDB: public BlockchainDB {
+class TestDB: public BaseTestDB {
 public:
-  TestDB() {};
-  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 blobdata get_block_blob_from_height(const uint64_t& height) const { return cryptonote::t_serializable_object_to_blob(get_block_from_height(height)); }
-  virtual blobdata get_block_blob(const crypto::hash& h) const { return 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_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 block_header get_block_header(const crypto::hash& h) const { return 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 difficulty_type get_block_cumulative_difficulty(const uint64_t& height) const { return 10; }
-  virtual 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 crypto::hash get_block_hash_from_height(const uint64_t& height) const { return crypto::hash(); }
-  virtual std::vector<block> get_blocks_range(const uint64_t& h1, const uint64_t& h2) const { return std::vector<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 block get_top_block() const { return block(); }
   virtual uint64_t height() const { return blocks.size(); }
-  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 transaction get_tx(const crypto::hash& h) const { return transaction(); }
-  virtual bool get_tx(const crypto::hash& h, transaction &tx) const { return false; }
-  virtual uint64_t get_tx_count() const { return 0; }
-  virtual std::vector<transaction> get_tx_list(const std::vector<crypto::hash>& hlist) const { return std::vector<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 output_data_t get_output_key(const uint64_t& amount, const uint64_t& index) { 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 {}
-  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 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<uint64_t> get_tx_amount_output_indices(const uint64_t tx_index) const { return std::vector<uint64_t>(); }
-  virtual bool has_key_image(const crypto::key_image& img) const { return false; }
-  virtual void remove_block() { blocks.pop_back(); }
-  virtual uint64_t add_transaction_data(const crypto::hash& blk_hash, const 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 transaction& tx) {}
-  virtual uint64_t add_output(const crypto::hash& tx_hash, const 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 txpool_tx_meta_t& details) {}
-  virtual void update_txpool_tx(const crypto::hash &txid, const 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, 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 txpool_tx_meta_t&, const cryptonote::blobdata*)>, bool include_blob = false, bool include_unrelayed_txes = false) const { return false; }
-
   virtual void add_block( const block& blk
                         , size_t block_weight
                         , const difficulty_type& cumulative_difficulty
@@ -138,6 +56,7 @@ public:
                         ) {
     blocks.push_back(blk);
   }
+  virtual void remove_block() { blocks.pop_back(); }
   virtual block get_block_from_height(const uint64_t& height) const {
     return blocks.at(height);
   }
@@ -149,13 +68,14 @@ public:
   virtual uint8_t get_hard_fork_version(uint64_t height) const {
     return versions.at(height);
   }
-  virtual void check_hard_fork_info() {}
 
 private:
   std::vector<block> blocks;
   std::deque<uint8_t> versions;
 };
 
+}
+
 static cryptonote::block mkblock(uint8_t version, uint8_t vote)
 {
   cryptonote::block b;

tests/unit_tests/output_distribution.cpp

@@ -0,0 +1,171 @@
+// Copyright (c) 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.
+
+#include "gtest/gtest.h"
+#include "misc_log_ex.h"
+#include "rpc/rpc_handler.h"
+#include "blockchain_db/blockchain_db.h"
+#include "cryptonote_core/cryptonote_core.h"
+#include "cryptonote_core/tx_pool.h"
+#include "cryptonote_core/blockchain.h"
+#include "testdb.h"
+
+static const uint64_t test_distribution[32] = {
+  0, 0, 0, 0, 0, 1, 5, 1, 4, 0, 0, 1, 0, 1, 2, 3, 1, 0, 2, 0, 1, 3, 8, 1, 3, 5, 7, 1, 5, 0, 2, 3
+};
+static const size_t test_distribution_size = sizeof(test_distribution) / sizeof(test_distribution[0]);
+
+namespace
+{
+
+class TestDB: public BaseTestDB
+{
+public:
+  TestDB(size_t bc_height = test_distribution_size): blockchain_height(bc_height) { m_open = true; }
+  virtual uint64_t height() const override { return blockchain_height; }
+
+  std::vector<uint64_t> get_block_cumulative_rct_outputs(const std::vector<uint64_t> &heights) const override
+  {
+    std::vector<uint64_t> d;
+    for (uint64_t h: heights)
+    {
+      uint64_t c = 0;
+      for (uint64_t i = 0; i <= h; ++i)
+        c += test_distribution[i];
+      d.push_back(c);
+    }
+    return d;
+  }
+
+  uint64_t blockchain_height;
+};
+
+}
+
+bool get_output_distribution(uint64_t amount, uint64_t from, uint64_t to, uint64_t &start_height, std::vector<uint64_t> &distribution, uint64_t &base)
+{
+  std::unique_ptr<cryptonote::Blockchain> bc;
+  cryptonote::tx_memory_pool txpool(*bc);
+  bc.reset(new cryptonote::Blockchain(txpool));
+  struct get_test_options {
+    const std::pair<uint8_t, uint64_t> hard_forks[2];
+    const cryptonote::test_options test_options = {
+      hard_forks
+    };
+    get_test_options():hard_forks{std::make_pair((uint8_t)1, (uint64_t)0), std::make_pair((uint8_t)0, (uint64_t)0)}{}
+  } opts;
+  cryptonote::Blockchain *blockchain = bc.get();
+  bool r = blockchain->init(new TestDB(test_distribution_size), cryptonote::FAKECHAIN, true, &opts.test_options, 0, NULL);
+  return r && bc->get_output_distribution(amount, from, to, start_height, distribution, base);
+}
+
+TEST(output_distribution, extend)
+{
+  boost::optional<cryptonote::rpc::output_distribution_data> res;
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 28, 29, false);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 2);
+  ASSERT_EQ(res->distribution, std::vector<uint64_t>({5, 0}));
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 28, 29, true);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 2);
+  ASSERT_EQ(res->distribution, std::vector<uint64_t>({55, 55}));
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 28, 30, false);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 3);
+  ASSERT_EQ(res->distribution, std::vector<uint64_t>({5, 0, 2}));
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 28, 30, true);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 3);
+  ASSERT_EQ(res->distribution, std::vector<uint64_t>({55, 55, 57}));
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 28, 31, false);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 4);
+  ASSERT_EQ(res->distribution, std::vector<uint64_t>({5, 0, 2, 3}));
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 28, 31, true);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 4);
+  ASSERT_EQ(res->distribution, std::vector<uint64_t>({55, 55, 57, 60}));
+}
+
+TEST(output_distribution, one)
+{
+  boost::optional<cryptonote::rpc::output_distribution_data> res;
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 0, 0, false);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 1);
+  ASSERT_EQ(res->distribution.back(), 0);
+}
+
+TEST(output_distribution, full_cumulative)
+{
+  boost::optional<cryptonote::rpc::output_distribution_data> res;
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 0, 31, true);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 32);
+  ASSERT_EQ(res->distribution.back(), 60);
+}
+
+TEST(output_distribution, full_noncumulative)
+{
+  boost::optional<cryptonote::rpc::output_distribution_data> res;
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 0, 31, false);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 32);
+  for (size_t i = 0; i < 32; ++i)
+    ASSERT_EQ(res->distribution[i], test_distribution[i]);
+}
+
+TEST(output_distribution, part_cumulative)
+{
+  boost::optional<cryptonote::rpc::output_distribution_data> res;
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 4, 8, true);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 5);
+  ASSERT_EQ(res->distribution, std::vector<uint64_t>({0, 1, 6, 7, 11}));
+}
+
+TEST(output_distribution, part_noncumulative)
+{
+  boost::optional<cryptonote::rpc::output_distribution_data> res;
+
+  res = cryptonote::rpc::RpcHandler::get_output_distribution(::get_output_distribution, 0, 4, 8, false);
+  ASSERT_TRUE(res != boost::none);
+  ASSERT_EQ(res->distribution.size(), 5);
+  ASSERT_EQ(res->distribution, std::vector<uint64_t>({0, 1, 5, 1, 4}));
+}

tests/unit_tests/testdb.h

@@ -0,0 +1,146 @@
+// 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 "gtest/gtest.h"
+
+#include "blockchain_db/blockchain_db.h"
+
+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 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) { 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 uint64_t &amount, const std::vector<uint64_t> &offsets, std::vector<cryptonote::output_data_t> &outputs, bool allow_partial = false) {}
+  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<uint64_t> get_tx_amount_output_indices(const uint64_t tx_index) const { return 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
+                        , 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; }
+};
+