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test(headerssync): Test returning of pow_validated_headers behavior

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Adding these checks necessitates increasing the length of the generated test chains so that we can properly exceed the REDOWNLOAD_BUFFER_SIZE during the test.

One can check out this commit and locally revert the TARGET_BLOCKS value change to prove the need for tests being able to control the buffer size, as is done by the next commit. Beyond the current REDOWNLOAD_BUFFER_SIZE of 15'009 we need 3 extra - 15'012 TARGET_BLOCKS:
* 1 for the genesis block.
* 1 for the test wanting to check that we start receiving headers for permanent storage *before* the final header (first_chain.back()).
* 1 to exceed REDOWNLOAD_BUFFER_SIZE in HeadersSyncState::PopHeadersReadyForAcceptance().

(The release process includes an occasional increase of the REDOWNLOAD_BUFFER_SIZE value, see release-process.md and history of headerssync.cpp).
This commit is contained in:
Hodlinator
2025-09-03 23:44:59 +02:00
parent 7b00643ef5
commit 8fd1c2893e
1 changed files with 23 additions and 4 deletions
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27
src/test/headers_sync_chainwork_tests.cpp
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@@ -40,9 +40,12 @@ using State = HeadersSyncState::State;
} \
} while (false)
constexpr size_t TARGET_BLOCKS{15'000};
constexpr size_t TARGET_BLOCKS{15'012};
constexpr arith_uint256 CHAIN_WORK{TARGET_BLOCKS * 2};
// Copied from headerssync.cpp, will be redefined in next commit.
constexpr size_t REDOWNLOAD_BUFFER_SIZE{15'009};
struct HeadersGeneratorSetup : public RegTestingSetup {
const CBlock& genesis{Params().GenesisBlock()};
const CBlockIndex* chain_start{WITH_LOCK(::cs_main, return m_node.chainman->m_blockman.LookupBlockIndex(genesis.GetHash()))};
@@ -180,12 +183,28 @@ BOOST_AUTO_TEST_CASE(happy_path)
/*exp_headers_size=*/0, /*exp_pow_validated_prev=*/std::nullopt,
/*exp_locator_hash=*/genesis_hash);
CHECK_RESULT(hss.ProcessNextHeaders(first_chain, full_headers_message),
// Nothing left for the sync logic to do:
// Process only so that the internal threshold isn't exceeded, meaning
// validated headers shouldn't be returned yet:
CHECK_RESULT(hss.ProcessNextHeaders({first_chain.begin(), REDOWNLOAD_BUFFER_SIZE}, true),
hss, /*exp_state=*/State::REDOWNLOAD,
/*exp_success*/true, /*exp_request_more=*/true,
/*exp_headers_size=*/0, /*exp_pow_validated_prev=*/std::nullopt,
/*exp_locator_hash=*/first_chain[REDOWNLOAD_BUFFER_SIZE - 1].GetHash());
// We start receiving headers for permanent storage before completing:
CHECK_RESULT(hss.ProcessNextHeaders({{first_chain[REDOWNLOAD_BUFFER_SIZE]}}, true),
hss, /*exp_state=*/State::REDOWNLOAD,
/*exp_success*/true, /*exp_request_more=*/true,
/*exp_headers_size=*/1, /*exp_pow_validated_prev=*/genesis_hash,
/*exp_locator_hash=*/first_chain[REDOWNLOAD_BUFFER_SIZE].GetHash());
// Feed in remaining headers, meeting the work threshold again and
// completing the REDOWNLOAD phase:
CHECK_RESULT(hss.ProcessNextHeaders({first_chain.begin() + REDOWNLOAD_BUFFER_SIZE + 1, first_chain.end()}, full_headers_message),
hss, /*exp_state=*/State::FINAL,
/*exp_success*/true, /*exp_request_more=*/false,
// All headers except the one already returned above:
/*exp_headers_size=*/first_chain.size(), /*exp_pow_validated_prev=*/genesis_hash,
/*exp_headers_size=*/first_chain.size() - 1, /*exp_pow_validated_prev=*/first_chain.front().GetHash(),
/*exp_locator_hash=*/std::nullopt);
}
}