oxen-core/tests/block_weight/block_weight.cpp

// Copyright (c) 2019, The Monero Project
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#include "cryptonote_config.h"
#define IN_UNIT_TESTS

#include <stdio.h>
#include <math.h>
#include "cryptonote_core/blockchain.h"
#include "cryptonote_core/tx_pool.h"
#include "cryptonote_core/cryptonote_core.h"
#include "cryptonote_core/uptime_proof.h"
#include "blockchain_utilities/blockchain_objects.h"
#include "blockchain_db/testdb.h"

#define LONG_TERM_BLOCK_WEIGHT_WINDOW 5000

enum test_t
{
  test_max = 0,
  test_lcg = 1,
  test_min = 2,
};

namespace
{

class TestDB: public cryptonote::BaseTestDB
{
private:
  struct block_t
  {
    size_t weight;
    uint64_t long_term_weight;
  };

public:
  TestDB() { m_open = true; }

  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
                        ) override {
    blocks.push_back({block_weight, long_term_block_weight});
  }
  virtual uint64_t height() const override { return blocks.size(); }
  virtual size_t get_block_weight(const uint64_t &h) const override { return blocks[h].weight; }
  virtual uint64_t get_block_long_term_weight(const uint64_t &h) const override { return blocks[h].long_term_weight; }
  virtual std::vector<uint64_t> get_block_weights(uint64_t start_height, size_t count) const override {
    std::vector<uint64_t> ret;
    ret.reserve(count);
    while (count-- && start_height < blocks.size()) ret.push_back(blocks[start_height++].weight);
    return ret;
  }
  virtual std::vector<uint64_t> get_long_term_block_weights(uint64_t start_height, size_t count) const override {
    std::vector<uint64_t> ret;
    ret.reserve(count);
    while (count-- && start_height < blocks.size()) ret.push_back(blocks[start_height++].long_term_weight);
    return ret;
  }
  virtual crypto::hash get_block_hash_from_height(const uint64_t &height) const override {
    crypto::hash hash{};
    *reinterpret_cast<uint64_t*>(hash.data()) = height;
    return hash;
  }
  virtual crypto::hash top_block_hash(uint64_t *block_height = NULL) const override {
    uint64_t h = height();
    crypto::hash top{};
    if (h)
      *(uint64_t*)&top = h - 1;
    if (block_height)
      *block_height = h - 1;
    return top;
  }
  virtual void pop_block(cryptonote::block &blk, std::vector<cryptonote::transaction> &txs) override { blocks.pop_back(); }

private:
  std::vector<block_t> blocks;
  std::vector<uint8_t> hf;
};

}

static uint32_t lcg_seed = 0;

static uint32_t lcg()
{
  lcg_seed = (lcg_seed * 0x100000001b3 + 0xcbf29ce484222325) & 0xffffffff;
  return lcg_seed;
}

static void test(test_t t, uint64_t blocks)
{
  blockchain_objects_t bc_objects = {};

  const std::vector<cryptonote::hard_fork> hard_forks{
      {cryptonote::hf::hf7, 0, 0, 0},
      {cryptonote::hf::hf11_infinite_staking, 0, 5000, 0}};

  const cryptonote::test_options test_options{hard_forks, 5000};

  auto& bc = bc_objects.m_blockchain;
  if (!bc.init(new TestDB(), nullptr /*ons_db*/, nullptr /*sqlite_db*/, cryptonote::network_type::FAKECHAIN, true, &test_options, 0, NULL)) {
    fprintf(stderr, "Failed to init blockchain\n");
    exit(1);
  };


  for (uint64_t h = 0; h < LONG_TERM_BLOCK_WEIGHT_WINDOW; ++h)
  {
    cryptonote::block b;
    b.major_version = cryptonote::hf::hf7;
    b.minor_version = static_cast<uint8_t>(cryptonote::hf::hf7);
    bc.get_db().add_block(std::make_pair(b, ""), 300000, 300000, bc.get_db().height(), bc.get_db().height(), {});
    if (!bc.update_next_cumulative_weight_limit())
    {
      fprintf(stderr, "Failed to update cumulative weight limit 1\n");
      exit(1);
    }
  }

  for (uint64_t h = 0; h < blocks; ++h)
  {
    uint64_t w;
    uint64_t effective_block_weight_median = bc.get_current_cumulative_block_weight_median();
    switch (t)
    {
      case test_lcg:
      {
        uint32_t r = lcg();
        int64_t wi = 90 + r % 500000 + 250000 + sin(h / 200.) * 350000;
        w = wi < 90 ? 90 : wi;
        break;
      }
      case test_max:
        w = bc.get_current_cumulative_block_weight_limit();
        break;
      case test_min:
        w = 90;
        break;
      default:
        exit(1);
    }
    uint64_t ltw = bc.get_next_long_term_block_weight(w);
    cryptonote::block b;
    b.major_version = cryptonote::feature::LONG_TERM_BLOCK_WEIGHT;
    b.minor_version = static_cast<uint8_t>(b.major_version);
    bc.get_db().add_block(std::make_pair(std::move(b), ""), w, ltw, bc.get_db().height(), bc.get_db().height(), {});

    if (!bc.update_next_cumulative_weight_limit())
    {
      fprintf(stderr, "Failed to update cumulative weight limit\n");
      exit(1);
    }
    std::cout << "H " << h << ", BW " << w << ", EMBW " << effective_block_weight_median << ", LTBW " << ltw << std::endl;
  }
}

int main()
{
  TRY_ENTRY();
  test(test_max, 2 * LONG_TERM_BLOCK_WEIGHT_WINDOW);
  test(test_lcg, 9 * LONG_TERM_BLOCK_WEIGHT_WINDOW);
  test(test_min, 1 * LONG_TERM_BLOCK_WEIGHT_WINDOW);
  return 0;
  CATCH_ENTRY_L0("main", 1);
}