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sqlite: introduce HasActiveTxn method

Browse source 
Util function to clean up code and let us
verify, in the following-up commit, that dangling,
to-be-reverted db transactions cannot occur anymore.
This commit is contained in:
furszy 2024-01-15 20:18:34 -03:00
parent dca874e838
commit 472d2ca981
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GPG key ID: 5DD23CCC686AA623
2 changed files with 14 additions and 5 deletions
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16
src/wallet/sqlite.cpp
View file

@ -377,6 +377,12 @@ void SQLiteDatabase::Close()
m_db = nullptr;
}
bool SQLiteDatabase::HasActiveTxn()
{
// 'sqlite3_get_autocommit' returns true by default, and false if a transaction has begun and not been committed or rolled back.
return m_db && sqlite3_get_autocommit(m_db) == 0;
}
int SQliteExecHandler::Exec(SQLiteDatabase& database, const std::string& statement)
{
return sqlite3_exec(database.m_db, statement.data(), nullptr, nullptr, nullptr);
@ -399,8 +405,8 @@ SQLiteBatch::SQLiteBatch(SQLiteDatabase& database)
void SQLiteBatch::Close()
{
// If m_db is in a transaction (i.e. not in autocommit mode), then abort the transaction in progress
if (m_database.m_db && sqlite3_get_autocommit(m_database.m_db) == 0) {
// If we began a transaction, and it wasn't committed, abort the transaction in progress
if (m_database.HasActiveTxn()) {
if (TxnAbort()) {
LogPrintf("SQLiteBatch: Batch closed unexpectedly without the transaction being explicitly committed or aborted\n");
} else {
@ -611,7 +617,7 @@ std::unique_ptr<DatabaseCursor> SQLiteBatch::GetNewPrefixCursor(Span<const std::
bool SQLiteBatch::TxnBegin()
{
if (!m_database.m_db || sqlite3_get_autocommit(m_database.m_db) == 0) return false;
if (!m_database.m_db || m_database.HasActiveTxn()) return false;
int res = Assert(m_exec_handler)->Exec(m_database, "BEGIN TRANSACTION");
if (res != SQLITE_OK) {
LogPrintf("SQLiteBatch: Failed to begin the transaction\n");
@ -621,7 +627,7 @@ bool SQLiteBatch::TxnBegin()
bool SQLiteBatch::TxnCommit()
{
if (!m_database.m_db || sqlite3_get_autocommit(m_database.m_db) != 0) return false;
if (!m_database.HasActiveTxn()) return false;
int res = Assert(m_exec_handler)->Exec(m_database, "COMMIT TRANSACTION");
if (res != SQLITE_OK) {
LogPrintf("SQLiteBatch: Failed to commit the transaction\n");
@ -631,7 +637,7 @@ bool SQLiteBatch::TxnCommit()
bool SQLiteBatch::TxnAbort()
{
if (!m_database.m_db || sqlite3_get_autocommit(m_database.m_db) != 0) return false;
if (!m_database.HasActiveTxn()) return false;
int res = Assert(m_exec_handler)->Exec(m_database, "ROLLBACK TRANSACTION");
if (res != SQLITE_OK) {
LogPrintf("SQLiteBatch: Failed to abort the transaction\n");

3
src/wallet/sqlite.h
View file

@ -154,6 +154,9 @@ public:
/** Make a SQLiteBatch connected to this database */
std::unique_ptr<DatabaseBatch> MakeBatch(bool flush_on_close = true) override;
/** Return true if there is an on-going txn in this connection */
bool HasActiveTxn();
sqlite3* m_db{nullptr};
bool m_use_unsafe_sync;
};