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bdb: Be able to make byteswapped databases

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Byteswapped databases make it easier to test opening and deserializing
other endian databases.
This commit is contained in:
Ava Chow
2024-04-22 15:21:58 -04:00
parent d9878903fb
commit 6ace3e953f
4 changed files with 21 additions and 1 deletions
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16
src/wallet/bdb.cpp
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@@ -65,6 +65,8 @@ RecursiveMutex cs_db;
std::map<std::string, std::weak_ptr<BerkeleyEnvironment>> g_dbenvs GUARDED_BY(cs_db); //!< Map from directory name to db environment.
} // namespace
static constexpr auto REVERSE_BYTE_ORDER{std::endian::native == std::endian::little ? 4321 : 1234};
bool WalletDatabaseFileId::operator==(const WalletDatabaseFileId& rhs) const
{
return memcmp(value, &rhs.value, sizeof(value)) == 0;
@@ -300,7 +302,11 @@ static Span<const std::byte> SpanFromDbt(const SafeDbt& dbt)
}
BerkeleyDatabase::BerkeleyDatabase(std::shared_ptr<BerkeleyEnvironment> env, fs::path filename, const DatabaseOptions& options) :
WalletDatabase(), env(std::move(env)), m_filename(std::move(filename)), m_max_log_mb(options.max_log_mb)
WalletDatabase(),
env(std::move(env)),
m_byteswap(options.require_format == DatabaseFormat::BERKELEY_SWAP),
m_filename(std::move(filename)),
m_max_log_mb(options.max_log_mb)
{
auto inserted = this->env->m_databases.emplace(m_filename, std::ref(*this));
assert(inserted.second);
@@ -389,6 +395,10 @@ void BerkeleyDatabase::Open()
}
}
if (m_byteswap) {
pdb_temp->set_lorder(REVERSE_BYTE_ORDER);
}
ret = pdb_temp->open(nullptr, // Txn pointer
fMockDb ? nullptr : strFile.c_str(), // Filename
fMockDb ? strFile.c_str() : "main", // Logical db name
@@ -521,6 +531,10 @@ bool BerkeleyDatabase::Rewrite(const char* pszSkip)
BerkeleyBatch db(*this, true);
std::unique_ptr<Db> pdbCopy = std::make_unique<Db>(env->dbenv.get(), 0);
if (m_byteswap) {
pdbCopy->set_lorder(REVERSE_BYTE_ORDER);
}
int ret = pdbCopy->open(nullptr, // Txn pointer
strFileRes.c_str(), // Filename
"main", // Logical db name