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// Copyright (c) 2022 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 <chainparams.h>
#include <node/blockstorage.h>
#include <node/context.h>
#include <validation.h>
#include <boost/test/unit_test.hpp>
#include <test/util/setup_common.h>
using node::BlockManager;
using node::BLOCK_SERIALIZATION_HEADER_SIZE;
// use BasicTestingSetup here for the data directory configuration, setup, and cleanup
BOOST_FIXTURE_TEST_SUITE(blockmanager_tests, BasicTestingSetup)
BOOST_AUTO_TEST_CASE(blockmanager_find_block_pos)
{
const auto params {CreateChainParams(ArgsManager{}, CBaseChainParams::MAIN)};
BlockManager blockman {};
CChain chain {};
// simulate adding a genesis block normally
BOOST_CHECK_EQUAL(blockman.SaveBlockToDisk(params->GenesisBlock(), 0, chain, *params, nullptr).nPos, BLOCK_SERIALIZATION_HEADER_SIZE);
// simulate what happens during reindex
// simulate a well-formed genesis block being found at offset 8 in the blk00000.dat file
// the block is found at offset 8 because there is an 8 byte serialization header
// consisting of 4 magic bytes + 4 length bytes before each block in a well-formed blk file.
FlatFilePos pos{0, BLOCK_SERIALIZATION_HEADER_SIZE};
BOOST_CHECK_EQUAL(blockman.SaveBlockToDisk(params->GenesisBlock(), 0, chain, *params, &pos).nPos, BLOCK_SERIALIZATION_HEADER_SIZE);
// now simulate what happens after reindex for the first new block processed
// the actual block contents don't matter, just that it's a block.
// verify that the write position is at offset 0x12d.
// this is a check to make sure that https://github.com/bitcoin/bitcoin/issues/21379 does not recur
// 8 bytes (for serialization header) + 285 (for serialized genesis block) = 293
// add another 8 bytes for the second block's serialization header and we get 293 + 8 = 301
FlatFilePos actual{blockman.SaveBlockToDisk(params->GenesisBlock(), 1, chain, *params, nullptr)};
BOOST_CHECK_EQUAL(actual.nPos, BLOCK_SERIALIZATION_HEADER_SIZE + ::GetSerializeSize(params->GenesisBlock(), CLIENT_VERSION) + BLOCK_SERIALIZATION_HEADER_SIZE);
}
BOOST_AUTO_TEST_SUITE_END()
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