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pow_tests.cpp
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// Copyright (c) 2015-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <chain.h>
#include <chainparams.h>
#include <pow.h>
#include <test/util/setup_common.h>
#include <boost/test/unit_test.hpp>
BOOST_FIXTURE_TEST_SUITE(pow_tests, BasicTestingSetup)
/* Test calculation of next difficulty target with DGW */
BOOST_AUTO_TEST_CASE(get_next_work)
{
const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
static const std::vector<std::pair<uint32_t, uint32_t>> mainnet_data = {
{ 1408728124, 0x1b104be1U }, { 1408728332, 0x1b10e09eU }, { 1408728479, 0x1b11a33cU },
{ 1408728495, 0x1b121cf3U }, { 1408728608, 0x1b11951eU }, { 1408728744, 0x1b11abacU },
{ 1408728756, 0x1b118d9cU }, { 1408728950, 0x1b1123f9U }, { 1408729116, 0x1b1141bfU },
{ 1408729179, 0x1b110764U }, { 1408729305, 0x1b107556U }, { 1408729474, 0x1b104297U },
{ 1408729576, 0x1b1063d0U }, { 1408729587, 0x1b10e878U }, { 1408729647, 0x1b0dfaffU },
{ 1408729678, 0x1b0c9ab8U }, { 1408730179, 0x1b0c03d6U }, { 1408730862, 0x1b0dd168U },
{ 1408730914, 0x1b10b864U }, { 1408731242, 0x1b0fed89U }, { 1408731256, 0x1b113ff1U },
{ 1408732229, 0x1b10460bU }, { 1408732257, 0x1b13b83fU }, { 1408732489, 0x1b1418d4U }
};
// Construct a chain of block index entries
std::list<CBlockIndex> blockidx;
CBlockIndex* blockIndexLast{nullptr};
for (const auto& [nTime, nBits] : mainnet_data) {
auto& entry = blockidx.emplace_back();
entry.nTime = nTime;
entry.nBits = nBits;
entry.pprev = blockIndexLast;
blockIndexLast = &entry;
}
blockIndexLast->nHeight = 123456;
assert(mainnet_data.size() == blockidx.size());
CBlockHeader blockHeader;
blockHeader.nTime = 1408732505; // Block #123457
BOOST_CHECK_EQUAL(GetNextWorkRequired(blockIndexLast, &blockHeader, chainParams->GetConsensus()), 0x1b1441deU); // Block #123457 has 0x1b1441de
// test special rules for slow blocks on devnet/testnet
gArgs.SoftSetBoolArg("-devnet", true);
const auto chainParamsDev = CreateChainParams(*m_node.args, CBaseChainParams::DEVNET);
gArgs.ForceRemoveArg("devnet");
// make sure normal rules apply
blockHeader.nTime = 1408732505; // Block #123457
BOOST_CHECK_EQUAL(GetNextWorkRequired(blockIndexLast, &blockHeader, chainParamsDev->GetConsensus()), 0x1b1441deU); // Block #123457 has 0x1b1441de
// 10x higher target
blockHeader.nTime = 1408733090; // Block #123457 (10m+1sec)
BOOST_CHECK_EQUAL(GetNextWorkRequired(blockIndexLast, &blockHeader, chainParamsDev->GetConsensus()), 0x1c00c8f8U); // Block #123457 has 0x1c00c8f8
blockHeader.nTime = 1408733689; // Block #123457 (20m)
BOOST_CHECK_EQUAL(GetNextWorkRequired(blockIndexLast, &blockHeader, chainParamsDev->GetConsensus()), 0x1c00c8f8U); // Block #123457 has 0x1c00c8f8
// lowest diff possible
blockHeader.nTime = 1408739690; // Block #123457 (2h+1sec)
BOOST_CHECK_EQUAL(GetNextWorkRequired(blockIndexLast, &blockHeader, chainParamsDev->GetConsensus()), 0x207fffffU); // Block #123457 has 0x207fffff
blockHeader.nTime = 1408743289; // Block #123457 (3h)
BOOST_CHECK_EQUAL(GetNextWorkRequired(blockIndexLast, &blockHeader, chainParamsDev->GetConsensus()), 0x207fffffU); // Block #123457 has 0x207fffff
}
/* Test the constraint on the upper bound for next work */
// BOOST_AUTO_TEST_CASE(get_next_work_pow_limit)
// {
// const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
// int64_t nLastRetargetTime = 1231006505; // Block #0
// CBlockIndex pindexLast;
// pindexLast.nHeight = 2015;
// pindexLast.nTime = 1233061996; // Block #2015
// pindexLast.nBits = 0x1d00ffff;
// BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1d00ffffU);
// }
/* Test the constraint on the lower bound for actual time taken */
// BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual)
// {
// const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
// int64_t nLastRetargetTime = 1279008237; // Block #66528
// CBlockIndex pindexLast;
// pindexLast.nHeight = 68543;
// pindexLast.nTime = 1279297671; // Block #68543
// pindexLast.nBits = 0x1c05a3f4;
// BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1c0168fdU);
// }
/* Test the constraint on the upper bound for actual time taken */
// BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual)
// {
// const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
// int64_t nLastRetargetTime = 1263163443; // NOTE: Not an actual block time
// CBlockIndex pindexLast;
// pindexLast.nHeight = 46367;
// pindexLast.nTime = 1269211443; // Block #46367
// pindexLast.nBits = 0x1c387f6f;
// BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1d00e1fdU);
// }
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_negative_target)
{
const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits;
nBits = UintToArith256(consensus.powLimit).GetCompact(true);
hash.SetHex("0x1");
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_overflow_target)
{
const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits = ~0x00800000;
hash.SetHex("0x1");
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_too_easy_target)
{
const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits;
arith_uint256 nBits_arith = UintToArith256(consensus.powLimit);
nBits_arith *= 2;
nBits = nBits_arith.GetCompact();
hash.SetHex("0x1");
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_biger_hash_than_target)
{
const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits;
arith_uint256 hash_arith = UintToArith256(consensus.powLimit);
nBits = hash_arith.GetCompact();
hash_arith *= 2; // hash > nBits
hash = ArithToUint256(hash_arith);
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_zero_target)
{
const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus();
uint256 hash;
unsigned int nBits;
arith_uint256 hash_arith{0};
nBits = hash_arith.GetCompact();
hash = ArithToUint256(hash_arith);
BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
}
BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test)
{
const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
std::vector<CBlockIndex> blocks(10000);
for (int i = 0; i < 10000; i++) {
blocks[i].pprev = i ? &blocks[i - 1] : nullptr;
blocks[i].nHeight = i;
blocks[i].nTime = 1269211443 + i * chainParams->GetConsensus().nPowTargetSpacing;
blocks[i].nBits = 0x207fffff; /* target 0x7fffff000... */
blocks[i].nChainWork = i ? blocks[i - 1].nChainWork + GetBlockProof(blocks[i - 1]) : arith_uint256(0);
}
for (int j = 0; j < 1000; j++) {
CBlockIndex *p1 = &blocks[InsecureRandRange(10000)];
CBlockIndex *p2 = &blocks[InsecureRandRange(10000)];
CBlockIndex *p3 = &blocks[InsecureRandRange(10000)];
int64_t tdiff = GetBlockProofEquivalentTime(*p1, *p2, *p3, chainParams->GetConsensus());
BOOST_CHECK_EQUAL(tdiff, p1->GetBlockTime() - p2->GetBlockTime());
}
}
BOOST_AUTO_TEST_SUITE_END()