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kernel: Add functions to read block from disk to C header

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This adds functions for reading a block from disk with a retrieved block
tree entry. External services that wish to build their own index, or
analyze blocks can use this to retrieve block data.

The block tree can now be traversed from the tip backwards. This is
guaranteed to work, since the chainstate maintains an internal block
tree index in memory and every block (besides the genesis) has an
ancestor.

The user can use this function to iterate through all blocks in the
chain (starting from the tip). The tip is retrieved from a separate
`Chain` object, which allows distinguishing whether entries are
currently in the best chain. Once the block tree entry for the genesis
block is reached a nullptr is returned if the user attempts to get the
previous entry.
This commit is contained in:
TheCharlatan
2024-06-01 13:03:31 +02:00
parent a263a4caf2
commit 09d0f62638
4 changed files with 179 additions and 1 deletions
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26
src/test/kernel/test_kernel.cpp
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@@ -693,6 +693,20 @@ void chainman_mainnet_validation_test(TestDirectory& test_directory)
BOOST_CHECK(!chainman->ProcessBlock(invalid_block, &new_block));
BOOST_CHECK(!new_block);
auto chain{chainman->GetChain()};
BOOST_CHECK_EQUAL(chain.Height(), 1);
auto tip{chain.Tip()};
auto read_block{chainman->ReadBlock(tip)};
BOOST_REQUIRE(read_block);
check_equal(read_block.value().ToBytes(), raw_block);
// Check that we can read the previous block
auto tip_2{tip.GetPrevious()};
auto read_block_2{chainman->ReadBlock(tip_2.value())};
// It should be an error if we go another block back, since the genesis has no ancestor
BOOST_CHECK(!tip_2.value().GetPrevious());
// If we try to validate it again, it should be a duplicate
BOOST_CHECK(chainman->ProcessBlock(block, &new_block));
BOOST_CHECK(!new_block);
@@ -758,4 +772,16 @@ BOOST_AUTO_TEST_CASE(btck_chainman_regtest_tests)
BOOST_CHECK(chainman->ProcessBlock(block, &new_block));
BOOST_CHECK(new_block);
}
auto chain = chainman->GetChain();
auto tip = chain.Tip();
auto read_block = chainman->ReadBlock(tip).value();
check_equal(read_block.ToBytes(), hex_string_to_byte_vec(REGTEST_BLOCK_DATA[REGTEST_BLOCK_DATA.size() - 1]));
auto tip_2 = tip.GetPrevious().value();
auto read_block_2 = chainman->ReadBlock(tip_2).value();
check_equal(read_block_2.ToBytes(), hex_string_to_byte_vec(REGTEST_BLOCK_DATA[REGTEST_BLOCK_DATA.size() - 2]));
std::filesystem::remove_all(test_directory.m_directory / "blocks" / "blk00000.dat");
BOOST_CHECK(!chainman->ReadBlock(tip_2));
}