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// Copyright (c) 2018 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 <boost/test/unit_test.hpp>
#include <chainparams.h>
#include <consensus/merkle.h>
#include <consensus/validation.h>
#include <miner.h>
#include <pow.h>
#include <random.h>
#include <test/setup_common.h>
#include <validation.h>
#include <validationinterface.h>
struct RegtestingSetup : public TestingSetup {
RegtestingSetup() : TestingSetup(CBaseChainParams::REGTEST) {}
};
BOOST_FIXTURE_TEST_SUITE(validation_block_tests, RegtestingSetup)
struct TestSubscriber : public CValidationInterface {
uint256 m_expected_tip;
explicit TestSubscriber(uint256 tip) : m_expected_tip(tip) {}
void UpdatedBlockTip(const CBlockIndex* pindexNew, const CBlockIndex* pindexFork, bool fInitialDownload) override
{
BOOST_CHECK_EQUAL(m_expected_tip, pindexNew->GetBlockHash());
}
void BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* pindex, const std::vector<CTransactionRef>& txnConflicted) override
{
BOOST_CHECK_EQUAL(m_expected_tip, block->hashPrevBlock);
BOOST_CHECK_EQUAL(m_expected_tip, pindex->pprev->GetBlockHash());
m_expected_tip = block->GetHash();
}
void BlockDisconnected(const std::shared_ptr<const CBlock>& block) override
{
BOOST_CHECK_EQUAL(m_expected_tip, block->GetHash());
m_expected_tip = block->hashPrevBlock;
}
};
std::shared_ptr<CBlock> Block(const uint256& prev_hash)
{
static int i = 0;
static uint64_t time = Params().GenesisBlock().nTime;
CScript pubKey;
pubKey << i++ << OP_TRUE;
auto ptemplate = BlockAssembler(Params()).CreateNewBlock(pubKey);
auto pblock = std::make_shared<CBlock>(ptemplate->block);
pblock->hashPrevBlock = prev_hash;
pblock->nTime = ++time;
CMutableTransaction txCoinbase(*pblock->vtx[0]);
txCoinbase.vout.resize(1);
txCoinbase.vin[0].scriptWitness.SetNull();
pblock->vtx[0] = MakeTransactionRef(std::move(txCoinbase));
return pblock;
}
std::shared_ptr<CBlock> FinalizeBlock(std::shared_ptr<CBlock> pblock)
{
pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus())) {
++(pblock->nNonce);
}
return pblock;
}
// construct a valid block
const std::shared_ptr<const CBlock> GoodBlock(const uint256& prev_hash)
{
return FinalizeBlock(Block(prev_hash));
}
// construct an invalid block (but with a valid header)
const std::shared_ptr<const CBlock> BadBlock(const uint256& prev_hash)
{
auto pblock = Block(prev_hash);
CMutableTransaction coinbase_spend;
coinbase_spend.vin.push_back(CTxIn(COutPoint(pblock->vtx[0]->GetHash(), 0), CScript(), 0));
coinbase_spend.vout.push_back(pblock->vtx[0]->vout[0]);
CTransactionRef tx = MakeTransactionRef(coinbase_spend);
pblock->vtx.push_back(tx);
auto ret = FinalizeBlock(pblock);
return ret;
}
void BuildChain(const uint256& root, int height, const unsigned int invalid_rate, const unsigned int branch_rate, const unsigned int max_size, std::vector<std::shared_ptr<const CBlock>>& blocks)
{
if (height <= 0 || blocks.size() >= max_size) return;
bool gen_invalid = InsecureRandRange(100) < invalid_rate;
bool gen_fork = InsecureRandRange(100) < branch_rate;
const std::shared_ptr<const CBlock> pblock = gen_invalid ? BadBlock(root) : GoodBlock(root);
blocks.push_back(pblock);
if (!gen_invalid) {
BuildChain(pblock->GetHash(), height - 1, invalid_rate, branch_rate, max_size, blocks);
}
if (gen_fork) {
blocks.push_back(GoodBlock(root));
BuildChain(blocks.back()->GetHash(), height - 1, invalid_rate, branch_rate, max_size, blocks);
}
}
BOOST_AUTO_TEST_CASE(processnewblock_signals_ordering)
{
// build a large-ish chain that's likely to have some forks
std::vector<std::shared_ptr<const CBlock>> blocks;
while (blocks.size() < 50) {
blocks.clear();
BuildChain(Params().GenesisBlock().GetHash(), 100, 15, 10, 500, blocks);
}
bool ignored;
CValidationState state;
std::vector<CBlockHeader> headers;
std::transform(blocks.begin(), blocks.end(), std::back_inserter(headers), [](std::shared_ptr<const CBlock> b) { return b->GetBlockHeader(); });
// Process all the headers so we understand the toplogy of the chain
BOOST_CHECK(ProcessNewBlockHeaders(headers, state, Params()));
// Connect the genesis block and drain any outstanding events
BOOST_CHECK(ProcessNewBlock(Params(), std::make_shared<CBlock>(Params().GenesisBlock()), true, &ignored));
SyncWithValidationInterfaceQueue();
// subscribe to events (this subscriber will validate event ordering)
const CBlockIndex* initial_tip = nullptr;
{
LOCK(cs_main);
initial_tip = chainActive.Tip();
}
TestSubscriber sub(initial_tip->GetBlockHash());
RegisterValidationInterface(&sub);
// create a bunch of threads that repeatedly process a block generated above at random
// this will create parallelism and randomness inside validation - the ValidationInterface
// will subscribe to events generated during block validation and assert on ordering invariance
std::vector<std::thread> threads;
for (int i = 0; i < 10; i++) {
threads.emplace_back([&blocks]() {
bool ignored;
FastRandomContext insecure;
for (int i = 0; i < 1000; i++) {
auto block = blocks[insecure.randrange(blocks.size() - 1)];
ProcessNewBlock(Params(), block, true, &ignored);
}
// to make sure that eventually we process the full chain - do it here
for (auto block : blocks) {
if (block->vtx.size() == 1) {
bool processed = ProcessNewBlock(Params(), block, true, &ignored);
assert(processed);
}
}
});
}
for (auto& t : threads) {
t.join();
}
while (GetMainSignals().CallbacksPending() > 0) {
MilliSleep(100);
}
UnregisterValidationInterface(&sub);
BOOST_CHECK_EQUAL(sub.m_expected_tip, chainActive.Tip()->GetBlockHash());
}
BOOST_AUTO_TEST_SUITE_END()
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