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/* KInterbasDB Python Package - Implementation of Low-Level Transaction
* Operations
*
* Version 3.3
*
* The following contributors hold Copyright (C) over their respective
* portions of code (see license.txt for details):
*
* [Original Author (maintained through version 2.0-0.3.1):]
* 1998-2001 [alex] Alexander Kuznetsov <alexan@users.sourceforge.net>
* [Maintainers (after version 2.0-0.3.1):]
* 2001-2002 [maz] Marek Isalski <kinterbasdb@maz.nu>
* 2002-2007 [dsr] David Rushby <woodsplitter@rocketmail.com>
* [Contributors:]
* 2001 [eac] Evgeny A. Cherkashin <eugeneai@icc.ru>
* 2001-2002 [janez] Janez Jere <janez.jere@void.si>
*/
/*************************** DECLARATIONS : begin ****************************/
static isc_tr_handle begin_transaction(
/* Either: */ isc_db_handle db_handle, char *tpb, Py_ssize_t tpb_len,
/* Or: */ ISC_TEB *tebs, short teb_count,
ISC_STATUS *status_vector
);
static PyObject *trans___s__trans_handle;
static PyObject *trans___s__default_tpb_str_;
static PyObject *trans___s_SAVEPOINT_SPACE;
static PyObject *trans___s_ROLLBACK_TO_SPACE;
/**************************** DECLARATIONS : end *****************************/
/*********************** RAW TRANSACTION OPS : begin *************************/
static int init_kidb_transaction_support(void) {
#define INIT_TRANS_STRING_CONST(s) \
trans___s_ ## s = PyString_FromString(#s); \
if (trans___s_ ## s == NULL) { goto fail; }
INIT_TRANS_STRING_CONST(_trans_handle);
INIT_TRANS_STRING_CONST(_default_tpb_str_);
/* Can't use INIT_TRANS_STRING_CONST for these, because they contain
* spaces: */
trans___s_SAVEPOINT_SPACE = PyString_FromString("SAVEPOINT ");
if (trans___s_SAVEPOINT_SPACE == NULL) { goto fail; }
trans___s_ROLLBACK_TO_SPACE = PyString_FromString("ROLLBACK TO ");
if (trans___s_ROLLBACK_TO_SPACE == NULL) { goto fail; }
return 0;
fail:
return -1;
} /* init_kidb_transaction_support */
static isc_tr_handle begin_transaction(
/* Either: */ isc_db_handle db_handle, char *tpb, Py_ssize_t tpb_len,
/* Or: */ ISC_TEB *tebs, short teb_count,
ISC_STATUS *status_vector
)
{
isc_tr_handle trans_handle = NULL_TRANS_HANDLE;
/* (db_handle+tpb+tpb_len) and (tebs+teb_count) are mutually exclusive
* parameters. */
assert (
db_handle != NULL_DB_HANDLE
? tebs == NULL
: tebs != NULL && tpb == NULL
);
/* 2003.02.21: A huge TPB such as 'con.begin(tpb='x'*50000)' crashes the
* FB 1.0.2 server process, but responsibly raises an error with FB 1.5b2.
* Since kinterbasdb only exposes some 20 TPB component values, many of which
* are mutually exclusive, I decided to impose a reasonable limit right
* here. */
if (tpb_len > 255) {
raise_exception(ProgrammingError, "Transaction parameter buffer (TPB) too"
" large. len(tpb) must be <= 255."
);
goto fail;
}
ENTER_GDAL
if (tebs == NULL) {
isc_start_transaction(status_vector,
&trans_handle,
/* Only one database handle is being passed. */
1, &db_handle,
(unsigned short) tpb_len, /* Cast is safe b/c already checked val. */
tpb
);
} else {
isc_start_multiple(status_vector, &trans_handle, teb_count, tebs);
}
LEAVE_GDAL
if (DB_API_ERROR(status_vector)) {
raise_sql_exception(OperationalError, "begin transaction: ", status_vector);
goto fail;
}
assert (trans_handle != NULL_TRANS_HANDLE);
return trans_handle;
fail:
assert (PyErr_Occurred());
return NULL_TRANS_HANDLE;
} /* begin_transaction */
static TransactionalOperationResult prepare_transaction(
isc_tr_handle *trans_handle_p, ISC_STATUS *status_vector
)
{
assert (trans_handle_p != NULL);
if (*trans_handle_p == NULL_TRANS_HANDLE) {
raise_exception(ProgrammingError, "Attempted to prepare closed"
" transaction"
);
return OP_RESULT_ERROR;
}
ENTER_GDAL
isc_prepare_transaction(status_vector, trans_handle_p);
LEAVE_GDAL
if (DB_API_ERROR(status_vector)) {
raise_sql_exception(OperationalError, "prepare: ", status_vector);
return OP_RESULT_ERROR;
}
return OP_RESULT_OK;
} /* prepare_transaction */
static TransactionalOperationResult commit_transaction(
isc_tr_handle *trans_handle_p, boolean retaining,
ISC_STATUS *status_vector
)
{
assert (trans_handle_p != NULL);
if (*trans_handle_p == NULL_TRANS_HANDLE) {
/* As discussed on the Python DB-SIG in message:
* http://mail.python.org/pipermail/db-sig/2003-February/003158.html
* , allow a transaction to be committed even if its existence is only
* implicit. */
return OP_RESULT_OK;
}
{
/* This code can be reached when the CTT is timing out a connection. In
* that case, we want the GIL to remain held during the entire timeout
* operation. */
OPEN_LOCAL_GIL_MANIPULATION_INFRASTRUCTURE
#ifdef ENABLE_CONNECTION_TIMEOUT
const boolean should_manip_gil = NOT_RUNNING_IN_CONNECTION_TIMEOUT_THREAD;
if (should_manip_gil) {
#endif
LEAVE_GIL_WITHOUT_AFFECTING_DB_AND_WITHOUT_STARTING_CODE_BLOCK
#ifdef ENABLE_CONNECTION_TIMEOUT
}
#endif
ENTER_GDAL_WITHOUT_LEAVING_PYTHON
if (!retaining) {
isc_commit_transaction(status_vector, trans_handle_p);
} else {
isc_commit_retaining(status_vector, trans_handle_p);
assert (*trans_handle_p != NULL_TRANS_HANDLE);
}
LEAVE_GDAL_WITHOUT_ENTERING_PYTHON
#ifdef ENABLE_CONNECTION_TIMEOUT
if (should_manip_gil) {
#endif
ENTER_GIL_WITHOUT_AFFECTING_DB_AND_WITHOUT_ENDING_CODE_BLOCK
#ifdef ENABLE_CONNECTION_TIMEOUT
}
#endif
CLOSE_LOCAL_GIL_MANIPULATION_INFRASTRUCTURE
} /* end of lock manipulation scope */
if (DB_API_ERROR(status_vector)) {
raise_sql_exception(OperationalError, "commit: ", status_vector);
return OP_RESULT_ERROR;
}
return OP_RESULT_OK;
} /* commit_transaction */
static TransactionalOperationResult rollback_transaction(
isc_tr_handle *trans_handle_p, boolean retaining,
boolean allowed_to_raise, ISC_STATUS *status_vector
)
{
assert (trans_handle_p != NULL);
/* If there is not an active transaction, rolling back is meaningless, but
* acceptable. */
if (*trans_handle_p == NULL_TRANS_HANDLE) {
return OP_RESULT_OK;
}
{
/* This code can be reached when the CTT is timing out a connection. In
* that case, we want the GIL to remain held during the entire timeout
* operation. */
OPEN_LOCAL_GIL_MANIPULATION_INFRASTRUCTURE
#ifdef ENABLE_CONNECTION_TIMEOUT
const boolean should_manip_gil = NOT_RUNNING_IN_CONNECTION_TIMEOUT_THREAD;
if (should_manip_gil) {
#endif
LEAVE_GIL_WITHOUT_AFFECTING_DB_AND_WITHOUT_STARTING_CODE_BLOCK
#ifdef ENABLE_CONNECTION_TIMEOUT
}
#endif
ENTER_GDAL_WITHOUT_LEAVING_PYTHON
if (!retaining) {
isc_rollback_transaction(status_vector, trans_handle_p);
} else {
isc_rollback_retaining(status_vector, trans_handle_p);
assert (*trans_handle_p != NULL_TRANS_HANDLE);
}
LEAVE_GDAL_WITHOUT_ENTERING_PYTHON
#ifdef ENABLE_CONNECTION_TIMEOUT
if (should_manip_gil) {
#endif
ENTER_GIL_WITHOUT_AFFECTING_DB_AND_WITHOUT_ENDING_CODE_BLOCK
#ifdef ENABLE_CONNECTION_TIMEOUT
}
#endif
CLOSE_LOCAL_GIL_MANIPULATION_INFRASTRUCTURE
} /* end of lock manipulation scope */
if (DB_API_ERROR(status_vector)) {
raise_sql_exception(OperationalError, "rollback: ", status_vector);
if (allowed_to_raise) {
return OP_RESULT_ERROR;
} else {
SUPPRESS_EXCEPTION;
}
}
return OP_RESULT_OK;
} /* rollback_transaction */
/************************ RAW TRANSACTION OPS : end **************************/
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