/*
* subxact.__exit__(exc_type, exc, tb) or subxact.exit(exc_type, exc, tb)
*
* Exit an explicit subtransaction. exc_type is an exception type, exc
* is the exception object, tb is the traceback. If exc_type is None,
* commit the subtransactiony, if not abort it.
*
* The method signature is chosen to allow subtransaction objects to
* be used as context managers as described in
* <http://www.python.org/dev/peps/pep-0343/>.
*/
static PyObject *
PLy_subtransaction_exit(PyObject *self, PyObject *args)
{
PyObject *type;
PyObject *value;
PyObject *traceback;
PLySubtransactionData *subxactdata;
PLySubtransactionObject *subxact = (PLySubtransactionObject *) self;
if (!PyArg_ParseTuple(args, "OOO", &type, &value, &traceback))
return NULL;
if (!subxact->started)
{
PLy_exception_set(PyExc_ValueError, "this subtransaction has not been entered");
return NULL;
}
if (subxact->exited)
{
PLy_exception_set(PyExc_ValueError, "this subtransaction has already been exited");
return NULL;
}
if (explicit_subtransactions == NIL)
{
PLy_exception_set(PyExc_ValueError, "there is no subtransaction to exit from");
return NULL;
}
subxact->exited = true;
if (type != Py_None)
{
/* Abort the inner transaction */
RollbackAndReleaseCurrentSubTransaction();
}
else
{
ReleaseCurrentSubTransaction();
}
subxactdata = (PLySubtransactionData *) linitial(explicit_subtransactions);
explicit_subtransactions = list_delete_first(explicit_subtransactions);
MemoryContextSwitchTo(subxactdata->oldcontext);
CurrentResourceOwner = subxactdata->oldowner;
pfree(subxactdata);
/*
* AtEOSubXact_SPI() should not have popped any SPI context, but just in
* case it did, make sure we remain connected.
*/
SPI_restore_connection();
Py_INCREF(Py_None);
return Py_None;
}
void
PLy_spi_subtransaction_commit(MemoryContext oldcontext, ResourceOwner oldowner)
{
/* Commit the inner transaction, return to outer xact context */
ReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* AtEOSubXact_SPI() should not have popped any SPI context, but just
* in case it did, make sure we remain connected.
*/
SPI_restore_connection();
}
SV *
plperl_spi_fetchrow(char *cursor)
{
SV *row;
/*
* Execute the FETCH inside a sub-transaction, so we can cope with errors
* sanely
*/
MemoryContext oldcontext = CurrentMemoryContext;
ResourceOwner oldowner = CurrentResourceOwner;
BeginInternalSubTransaction(NULL);
/* Want to run inside function's memory context */
MemoryContextSwitchTo(oldcontext);
PG_TRY();
{
Portal p = SPI_cursor_find(cursor);
if (!p)
row = newSV(0);
else
{
SPI_cursor_fetch(p, true, 1);
if (SPI_processed == 0)
{
SPI_cursor_close(p);
row = newSV(0);
}
else
{
row = plperl_hash_from_tuple(SPI_tuptable->vals[0],
SPI_tuptable->tupdesc);
}
SPI_freetuptable(SPI_tuptable);
}
/* Commit the inner transaction, return to outer xact context */
ReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* AtEOSubXact_SPI() should not have popped any SPI context, but just
* in case it did, make sure we remain connected.
*/
SPI_restore_connection();
}
PG_CATCH();
{
ErrorData *edata;
/* Save error info */
MemoryContextSwitchTo(oldcontext);
edata = CopyErrorData();
FlushErrorState();
/* Abort the inner transaction */
RollbackAndReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* If AtEOSubXact_SPI() popped any SPI context of the subxact, it will
* have left us in a disconnected state. We need this hack to return
* to connected state.
*/
SPI_restore_connection();
/* Punt the error to Perl */
croak("%s", edata->message);
/* Can't get here, but keep compiler quiet */
return NULL;
}
PG_END_TRY();
return row;
}
SV *
plperl_spi_query(char *query)
{
SV *cursor;
/*
* Execute the query inside a sub-transaction, so we can cope with errors
* sanely
*/
MemoryContext oldcontext = CurrentMemoryContext;
ResourceOwner oldowner = CurrentResourceOwner;
BeginInternalSubTransaction(NULL);
/* Want to run inside function's memory context */
MemoryContextSwitchTo(oldcontext);
PG_TRY();
{
void *plan;
Portal portal = NULL;
/* Create a cursor for the query */
plan = SPI_prepare(query, 0, NULL);
if (plan)
portal = SPI_cursor_open(NULL, plan, NULL, NULL, false);
if (portal)
cursor = newSVpv(portal->name, 0);
else
cursor = newSV(0);
/* Commit the inner transaction, return to outer xact context */
ReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* AtEOSubXact_SPI() should not have popped any SPI context, but just
* in case it did, make sure we remain connected.
*/
SPI_restore_connection();
}
PG_CATCH();
{
ErrorData *edata;
/* Save error info */
MemoryContextSwitchTo(oldcontext);
edata = CopyErrorData();
FlushErrorState();
/* Abort the inner transaction */
RollbackAndReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* If AtEOSubXact_SPI() popped any SPI context of the subxact, it will
* have left us in a disconnected state. We need this hack to return
* to connected state.
*/
SPI_restore_connection();
/* Punt the error to Perl */
croak("%s", edata->message);
/* Can't get here, but keep compiler quiet */
return NULL;
}
PG_END_TRY();
return cursor;
}
HV *
plperl_spi_exec(char *query, int limit)
{
HV *ret_hv;
/*
* Execute the query inside a sub-transaction, so we can cope with errors
* sanely
*/
MemoryContext oldcontext = CurrentMemoryContext;
ResourceOwner oldowner = CurrentResourceOwner;
BeginInternalSubTransaction(NULL);
/* Want to run inside function's memory context */
MemoryContextSwitchTo(oldcontext);
PG_TRY();
{
int spi_rv;
spi_rv = SPI_execute(query, plperl_current_prodesc->fn_readonly,
limit);
ret_hv = plperl_spi_execute_fetch_result(SPI_tuptable, SPI_processed,
spi_rv);
/* Commit the inner transaction, return to outer xact context */
ReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* AtEOSubXact_SPI() should not have popped any SPI context, but just
* in case it did, make sure we remain connected.
*/
SPI_restore_connection();
}
PG_CATCH();
{
ErrorData *edata;
/* Save error info */
MemoryContextSwitchTo(oldcontext);
edata = CopyErrorData();
FlushErrorState();
/* Abort the inner transaction */
RollbackAndReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* If AtEOSubXact_SPI() popped any SPI context of the subxact, it will
* have left us in a disconnected state. We need this hack to return
* to connected state.
*/
SPI_restore_connection();
/* Punt the error to Perl */
croak("%s", edata->message);
/* Can't get here, but keep compiler quiet */
return NULL;
}
PG_END_TRY();
return ret_hv;
}
bool
pl_ist_commit(unsigned long xid, char state)
{
bool r = true;
/*
* Attempted commit while in an error state?
* Resolve to abort, and raise an exception.
*/
if (pl_state)
{
r = false; /* Always raises an exception in here */
if (pl_ist_abort(xid, state))
{
/*
* The abort was successful, but that fact needs to be
* communicated as the original action was a commit.
* Raise an exception.
*/
PyErr_SetInFailedTransaction();
}
Assert(PyErr_Occurred());
}
else
{
PG_TRY();
{
if (pl_ist_count != xid)
{
ereport(ERROR,(
errcode(ERRCODE_SAVEPOINT_EXCEPTION),
errmsg("out-of-order commit attempted on subtransaction %lu", xid),
errdetail("Subtransaction %lu was expected to exit next.", pl_ist_count)
));
}
/* Prevent wrap around */
if (pl_ist_count == 0)
{
ereport(ERROR,(
errcode(ERRCODE_SAVEPOINT_EXCEPTION),
errmsg("no current internal subtransaction"),
errhint("Attempt to commit an IST, when none running.")
));
}
if (state == pl_ist_committed)
{
ereport(ERROR,(
errcode(ERRCODE_SAVEPOINT_EXCEPTION),
errmsg("subtransaction already committed")
));
}
if (state == pl_ist_aborted)
{
ereport(ERROR,(
errcode(ERRCODE_SAVEPOINT_EXCEPTION),
errmsg("cannot commit aborted subtransaction")
));
}
if (state == pl_ist_new)
{
ereport(ERROR,(
errcode(ERRCODE_SAVEPOINT_EXCEPTION),
errmsg("cannot commit a subtransaction that has not been started")
));
}
pl_ist_count = pl_ist_count - 1;
ReleaseCurrentSubTransaction();
}
PG_CATCH();
{
PyErr_SetPgError(true);
pl_state = pl_in_failed_transaction;
r = false;
}
PG_END_TRY();
/* end of commit */
}
return(r);
}
static void
test_spi_exec_utility(int *passed, int *total)
{
int rc;
volatile int caseno = 0;
/* Initialize */
rc = SPI_connect();
if (rc != SPI_OK_CONNECT)
elog(ERROR, "could not connect SPI: %s", SPI_result_code_string(rc));
/*
* *-*-1
* - query error
*/
caseno++;
BeginInternalSubTransaction("test");
PG_TRY();
{
spi_exec_utility("RESET dummy_parameter");
elog(WARNING, "*-*-%d failed", caseno);
ReleaseCurrentSubTransaction();
}
PG_CATCH();
{
elog(WARNING, "%s-%d ok", __FUNCTION__, caseno);
(*passed)++;
RollbackAndReleaseCurrentSubTransaction();
FlushErrorState();
SPI_restore_connection();
}
PG_END_TRY();
/*
* *-*-2
* - query success
*/
caseno++;
BeginInternalSubTransaction("test");
PG_TRY();
{
spi_exec_utility("RESET client_min_messages");
elog(WARNING, "%s-%d ok", __FUNCTION__, caseno);
(*passed)++;
ReleaseCurrentSubTransaction();
}
PG_CATCH();
{
elog(WARNING, "*-*-%d failed", caseno);
RollbackAndReleaseCurrentSubTransaction();
SPI_restore_connection();
}
PG_END_TRY();
/* report # of tests */
(*total) += caseno;
/* Cleanup */
rc = SPI_finish();
if (rc != SPI_OK_FINISH && rc != SPI_ERROR_UNCONNECTED)
elog(ERROR, "could not finish SPI: %s", SPI_result_code_string(rc));
}
static void
test_spi_exec_query(int *passed, int *total)
{
int rc;
volatile int caseno = 0;
SPIPlanPtr ptr = NULL;
SPIPlanPtr org_ptr;
/* Initialize */
rc = SPI_connect();
if (rc != SPI_OK_CONNECT)
elog(ERROR, "could not connect SPI: %s", SPI_result_code_string(rc));
/*
* *-*-1
* - plan is not cached
*/
caseno++;
BeginInternalSubTransaction("test");
PG_TRY();
{
spi_exec_query("SELECT 1", 0, NULL, &ptr, NULL, NULL, SPI_OK_SELECT);
if (ptr != NULL && SPI_processed == 1)
{
elog(WARNING, "%s-%d ok", __FUNCTION__, caseno);
(*passed)++;
}
ReleaseCurrentSubTransaction();
}
PG_CATCH();
{
elog(WARNING, "*-*-%d failed", caseno);
RollbackAndReleaseCurrentSubTransaction();
SPI_restore_connection();
}
PG_END_TRY();
/*
* *-*-2
* - plan is cached
*/
caseno++;
BeginInternalSubTransaction("test");
PG_TRY();
{
org_ptr = ptr;
spi_exec_query(NULL, 0, NULL, &ptr, NULL, NULL, SPI_OK_SELECT);
if (ptr == org_ptr && SPI_processed == 1)
{
elog(WARNING, "%s-%d ok", __FUNCTION__, caseno);
(*passed)++;
}
ReleaseCurrentSubTransaction();
}
PG_CATCH();
{
elog(WARNING, "*-*-%d failed", caseno);
RollbackAndReleaseCurrentSubTransaction();
FlushErrorState();
SPI_restore_connection();
}
PG_END_TRY();
SPI_freeplan(ptr);
ptr = NULL;
/*
* *-*-3
* - query error
*/
caseno++;
BeginInternalSubTransaction("test");
PG_TRY();
{
spi_exec_query("SELECT 1 / 0",
0, NULL, &ptr, NULL, NULL, SPI_OK_SELECT);
elog(WARNING, "*-*-%d failed", caseno);
ReleaseCurrentSubTransaction();
}
PG_CATCH();
{
elog(WARNING, "%s-%d ok", __FUNCTION__, caseno);
(*passed)++;
RollbackAndReleaseCurrentSubTransaction();
FlushErrorState();
SPI_restore_connection();
}
PG_END_TRY();
SPI_freeplan(ptr);
ptr = NULL;
/*
* *-*-4
* - query success
*/
caseno++;
BeginInternalSubTransaction("test");
PG_TRY();
{
spi_exec_query("SELECT 1", 0, NULL, &ptr, NULL, NULL, SPI_OK_SELECT);
if (ptr != NULL && SPI_processed == 1)
{
elog(WARNING, "%s-%d ok", __FUNCTION__, caseno);
(*passed)++;
}
ReleaseCurrentSubTransaction();
}
PG_CATCH();
{
elog(WARNING, "*-*-%d failed", caseno);
PG_RE_THROW();
RollbackAndReleaseCurrentSubTransaction();
SPI_restore_connection();
}
PG_END_TRY();
SPI_freeplan(ptr);
ptr = NULL;
/* report # of tests */
(*total) += caseno;
/* Cleanup */
rc = SPI_finish();
if (rc != SPI_OK_FINISH && rc != SPI_ERROR_UNCONNECTED)
elog(ERROR, "could not finish SPI: %s", SPI_result_code_string(rc));
}
