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Diffstat (limited to 'src/pl/plpython/plpy_exec.c')
| -rw-r--r-- | src/pl/plpython/plpy_exec.c | 859 |
1 files changed, 859 insertions, 0 deletions
diff --git a/src/pl/plpython/plpy_exec.c b/src/pl/plpython/plpy_exec.c new file mode 100644 index 00000000000..7724f3f0cd0 --- /dev/null +++ b/src/pl/plpython/plpy_exec.c @@ -0,0 +1,859 @@ +/* + * executing Python code + * + * src/pl/plpython/plpy_exec.c + */ + +#include "postgres.h" + +#include "access/xact.h" +#include "catalog/pg_type.h" +#include "commands/trigger.h" +#include "executor/spi.h" +#include "funcapi.h" +#include "utils/builtins.h" +#include "utils/rel.h" +#include "utils/typcache.h" + +#include "plpython.h" + +#include "plpy_exec.h" + +#include "plpy_elog.h" +#include "plpy_main.h" +#include "plpy_procedure.h" +#include "plpy_subxactobject.h" + + +static PyObject *PLy_function_build_args(FunctionCallInfo, PLyProcedure *); +static void PLy_function_delete_args(PLyProcedure *); +static void plpython_return_error_callback(void *); + +static PyObject *PLy_trigger_build_args(FunctionCallInfo, PLyProcedure *, + HeapTuple *); +static HeapTuple PLy_modify_tuple(PLyProcedure *, PyObject *, + TriggerData *, HeapTuple); +static void plpython_trigger_error_callback(void *); + +static PyObject *PLy_procedure_call(PLyProcedure *, char *, PyObject *); +static void PLy_abort_open_subtransactions(int); + + +/* function subhandler */ +Datum +PLy_exec_function(FunctionCallInfo fcinfo, PLyProcedure *proc) +{ + Datum rv; + PyObject *volatile plargs = NULL; + PyObject *volatile plrv = NULL; + ErrorContextCallback plerrcontext; + + PG_TRY(); + { + if (!proc->is_setof || proc->setof == NULL) + { + /* + * Simple type returning function or first time for SETOF + * function: actually execute the function. + */ + plargs = PLy_function_build_args(fcinfo, proc); + plrv = PLy_procedure_call(proc, "args", plargs); + if (!proc->is_setof) + { + /* + * SETOF function parameters will be deleted when last row is + * returned + */ + PLy_function_delete_args(proc); + } + Assert(plrv != NULL); + } + + /* + * If it returns a set, call the iterator to get the next return item. + * We stay in the SPI context while doing this, because PyIter_Next() + * calls back into Python code which might contain SPI calls. + */ + if (proc->is_setof) + { + bool has_error = false; + ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo; + + if (proc->setof == NULL) + { + /* first time -- do checks and setup */ + if (!rsi || !IsA(rsi, ReturnSetInfo) || + (rsi->allowedModes & SFRM_ValuePerCall) == 0) + { + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("unsupported set function return mode"), + errdetail("PL/Python set-returning functions only support returning only value per call."))); + } + rsi->returnMode = SFRM_ValuePerCall; + + /* Make iterator out of returned object */ + proc->setof = PyObject_GetIter(plrv); + Py_DECREF(plrv); + plrv = NULL; + + if (proc->setof == NULL) + ereport(ERROR, + (errcode(ERRCODE_DATATYPE_MISMATCH), + errmsg("returned object cannot be iterated"), + errdetail("PL/Python set-returning functions must return an iterable object."))); + } + + /* Fetch next from iterator */ + plrv = PyIter_Next(proc->setof); + if (plrv) + rsi->isDone = ExprMultipleResult; + else + { + rsi->isDone = ExprEndResult; + has_error = PyErr_Occurred() != NULL; + } + + if (rsi->isDone == ExprEndResult) + { + /* Iterator is exhausted or error happened */ + Py_DECREF(proc->setof); + proc->setof = NULL; + + Py_XDECREF(plargs); + Py_XDECREF(plrv); + + PLy_function_delete_args(proc); + + if (has_error) + PLy_elog(ERROR, "error fetching next item from iterator"); + + /* Disconnect from the SPI manager before returning */ + if (SPI_finish() != SPI_OK_FINISH) + elog(ERROR, "SPI_finish failed"); + + fcinfo->isnull = true; + return (Datum) NULL; + } + } + + /* + * Disconnect from SPI manager and then create the return values datum + * (if the input function does a palloc for it this must not be + * allocated in the SPI memory context because SPI_finish would free + * it). + */ + if (SPI_finish() != SPI_OK_FINISH) + elog(ERROR, "SPI_finish failed"); + + plerrcontext.callback = plpython_return_error_callback; + plerrcontext.previous = error_context_stack; + error_context_stack = &plerrcontext; + + /* + * If the function is declared to return void, the Python return value + * must be None. For void-returning functions, we also treat a None + * return value as a special "void datum" rather than NULL (as is the + * case for non-void-returning functions). + */ + if (proc->result.out.d.typoid == VOIDOID) + { + if (plrv != Py_None) + ereport(ERROR, + (errcode(ERRCODE_DATATYPE_MISMATCH), + errmsg("PL/Python function with return type \"void\" did not return None"))); + + fcinfo->isnull = false; + rv = (Datum) 0; + } + else if (plrv == Py_None) + { + fcinfo->isnull = true; + if (proc->result.is_rowtype < 1) + rv = InputFunctionCall(&proc->result.out.d.typfunc, + NULL, + proc->result.out.d.typioparam, + -1); + else + /* Tuple as None */ + rv = (Datum) NULL; + } + else if (proc->result.is_rowtype >= 1) + { + TupleDesc desc; + HeapTuple tuple = NULL; + + /* make sure it's not an unnamed record */ + Assert((proc->result.out.d.typoid == RECORDOID && + proc->result.out.d.typmod != -1) || + (proc->result.out.d.typoid != RECORDOID && + proc->result.out.d.typmod == -1)); + + desc = lookup_rowtype_tupdesc(proc->result.out.d.typoid, + proc->result.out.d.typmod); + + tuple = PLyObject_ToTuple(&proc->result, desc, plrv); + + if (tuple != NULL) + { + fcinfo->isnull = false; + rv = HeapTupleGetDatum(tuple); + } + else + { + fcinfo->isnull = true; + rv = (Datum) NULL; + } + } + else + { + fcinfo->isnull = false; + rv = (proc->result.out.d.func) (&proc->result.out.d, -1, plrv); + } + } + PG_CATCH(); + { + Py_XDECREF(plargs); + Py_XDECREF(plrv); + + /* + * If there was an error the iterator might have not been exhausted + * yet. Set it to NULL so the next invocation of the function will + * start the iteration again. + */ + Py_XDECREF(proc->setof); + proc->setof = NULL; + + PG_RE_THROW(); + } + PG_END_TRY(); + + error_context_stack = plerrcontext.previous; + + Py_XDECREF(plargs); + Py_DECREF(plrv); + + return rv; +} + +/* trigger subhandler + * + * the python function is expected to return Py_None if the tuple is + * acceptable and unmodified. Otherwise it should return a PyString + * object who's value is SKIP, or MODIFY. SKIP means don't perform + * this action. MODIFY means the tuple has been modified, so update + * tuple and perform action. SKIP and MODIFY assume the trigger fires + * BEFORE the event and is ROW level. postgres expects the function + * to take no arguments and return an argument of type trigger. + */ +HeapTuple +PLy_exec_trigger(FunctionCallInfo fcinfo, PLyProcedure *proc) +{ + HeapTuple rv = NULL; + PyObject *volatile plargs = NULL; + PyObject *volatile plrv = NULL; + TriggerData *tdata; + + Assert(CALLED_AS_TRIGGER(fcinfo)); + + /* + * Input/output conversion for trigger tuples. Use the result TypeInfo + * variable to store the tuple conversion info. We do this over again on + * each call to cover the possibility that the relation's tupdesc changed + * since the trigger was last called. PLy_input_tuple_funcs and + * PLy_output_tuple_funcs are responsible for not doing repetitive work. + */ + tdata = (TriggerData *) fcinfo->context; + + PLy_input_tuple_funcs(&(proc->result), tdata->tg_relation->rd_att); + PLy_output_tuple_funcs(&(proc->result), tdata->tg_relation->rd_att); + + PG_TRY(); + { + plargs = PLy_trigger_build_args(fcinfo, proc, &rv); + plrv = PLy_procedure_call(proc, "TD", plargs); + + Assert(plrv != NULL); + + /* + * Disconnect from SPI manager + */ + if (SPI_finish() != SPI_OK_FINISH) + elog(ERROR, "SPI_finish failed"); + + /* + * return of None means we're happy with the tuple + */ + if (plrv != Py_None) + { + char *srv; + + if (PyString_Check(plrv)) + srv = PyString_AsString(plrv); + else if (PyUnicode_Check(plrv)) + srv = PLyUnicode_AsString(plrv); + else + { + ereport(ERROR, + (errcode(ERRCODE_DATA_EXCEPTION), + errmsg("unexpected return value from trigger procedure"), + errdetail("Expected None or a string."))); + srv = NULL; /* keep compiler quiet */ + } + + if (pg_strcasecmp(srv, "SKIP") == 0) + rv = NULL; + else if (pg_strcasecmp(srv, "MODIFY") == 0) + { + TriggerData *tdata = (TriggerData *) fcinfo->context; + + if (TRIGGER_FIRED_BY_INSERT(tdata->tg_event) || + TRIGGER_FIRED_BY_UPDATE(tdata->tg_event)) + rv = PLy_modify_tuple(proc, plargs, tdata, rv); + else + ereport(WARNING, + (errmsg("PL/Python trigger function returned \"MODIFY\" in a DELETE trigger -- ignored"))); + } + else if (pg_strcasecmp(srv, "OK") != 0) + { + /* + * accept "OK" as an alternative to None; otherwise, raise an + * error + */ + ereport(ERROR, + (errcode(ERRCODE_DATA_EXCEPTION), + errmsg("unexpected return value from trigger procedure"), + errdetail("Expected None, \"OK\", \"SKIP\", or \"MODIFY\"."))); + } + } + } + PG_CATCH(); + { + Py_XDECREF(plargs); + Py_XDECREF(plrv); + + PG_RE_THROW(); + } + PG_END_TRY(); + + Py_DECREF(plargs); + Py_DECREF(plrv); + + return rv; +} + +/* helper functions for Python code execution */ + +static PyObject * +PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure *proc) +{ + PyObject *volatile arg = NULL; + PyObject *volatile args = NULL; + int i; + + PG_TRY(); + { + args = PyList_New(proc->nargs); + for (i = 0; i < proc->nargs; i++) + { + if (proc->args[i].is_rowtype > 0) + { + if (fcinfo->argnull[i]) + arg = NULL; + else + { + HeapTupleHeader td; + Oid tupType; + int32 tupTypmod; + TupleDesc tupdesc; + HeapTupleData tmptup; + + td = DatumGetHeapTupleHeader(fcinfo->arg[i]); + /* Extract rowtype info and find a tupdesc */ + tupType = HeapTupleHeaderGetTypeId(td); + tupTypmod = HeapTupleHeaderGetTypMod(td); + tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod); + + /* Set up I/O funcs if not done yet */ + if (proc->args[i].is_rowtype != 1) + PLy_input_tuple_funcs(&(proc->args[i]), tupdesc); + + /* Build a temporary HeapTuple control structure */ + tmptup.t_len = HeapTupleHeaderGetDatumLength(td); + tmptup.t_data = td; + + arg = PLyDict_FromTuple(&(proc->args[i]), &tmptup, tupdesc); + ReleaseTupleDesc(tupdesc); + } + } + else + { + if (fcinfo->argnull[i]) + arg = NULL; + else + { + arg = (proc->args[i].in.d.func) (&(proc->args[i].in.d), + fcinfo->arg[i]); + } + } + + if (arg == NULL) + { + Py_INCREF(Py_None); + arg = Py_None; + } + + if (PyList_SetItem(args, i, arg) == -1) + PLy_elog(ERROR, "PyList_SetItem() failed, while setting up arguments"); + + if (proc->argnames && proc->argnames[i] && + PyDict_SetItemString(proc->globals, proc->argnames[i], arg) == -1) + PLy_elog(ERROR, "PyDict_SetItemString() failed, while setting up arguments"); + arg = NULL; + } + + /* Set up output conversion for functions returning RECORD */ + if (proc->result.out.d.typoid == RECORDOID) + { + TupleDesc desc; + + if (get_call_result_type(fcinfo, NULL, &desc) != TYPEFUNC_COMPOSITE) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("function returning record called in context " + "that cannot accept type record"))); + + /* cache the output conversion functions */ + PLy_output_record_funcs(&(proc->result), desc); + } + } + PG_CATCH(); + { + Py_XDECREF(arg); + Py_XDECREF(args); + + PG_RE_THROW(); + } + PG_END_TRY(); + + return args; +} + +static void +PLy_function_delete_args(PLyProcedure *proc) +{ + int i; + + if (!proc->argnames) + return; + + for (i = 0; i < proc->nargs; i++) + if (proc->argnames[i]) + PyDict_DelItemString(proc->globals, proc->argnames[i]); +} + +static void +plpython_return_error_callback(void *arg) +{ + if (PLy_curr_procedure) + errcontext("while creating return value"); +} + +static PyObject * +PLy_trigger_build_args(FunctionCallInfo fcinfo, PLyProcedure *proc, HeapTuple *rv) +{ + TriggerData *tdata = (TriggerData *) fcinfo->context; + PyObject *pltname, + *pltevent, + *pltwhen, + *pltlevel, + *pltrelid, + *plttablename, + *plttableschema; + PyObject *pltargs, + *pytnew, + *pytold; + PyObject *volatile pltdata = NULL; + char *stroid; + + PG_TRY(); + { + pltdata = PyDict_New(); + if (!pltdata) + PLy_elog(ERROR, "could not create new dictionary while building trigger arguments"); + + pltname = PyString_FromString(tdata->tg_trigger->tgname); + PyDict_SetItemString(pltdata, "name", pltname); + Py_DECREF(pltname); + + stroid = DatumGetCString(DirectFunctionCall1(oidout, + ObjectIdGetDatum(tdata->tg_relation->rd_id))); + pltrelid = PyString_FromString(stroid); + PyDict_SetItemString(pltdata, "relid", pltrelid); + Py_DECREF(pltrelid); + pfree(stroid); + + stroid = SPI_getrelname(tdata->tg_relation); + plttablename = PyString_FromString(stroid); + PyDict_SetItemString(pltdata, "table_name", plttablename); + Py_DECREF(plttablename); + pfree(stroid); + + stroid = SPI_getnspname(tdata->tg_relation); + plttableschema = PyString_FromString(stroid); + PyDict_SetItemString(pltdata, "table_schema", plttableschema); + Py_DECREF(plttableschema); + pfree(stroid); + + if (TRIGGER_FIRED_BEFORE(tdata->tg_event)) + pltwhen = PyString_FromString("BEFORE"); + else if (TRIGGER_FIRED_AFTER(tdata->tg_event)) + pltwhen = PyString_FromString("AFTER"); + else if (TRIGGER_FIRED_INSTEAD(tdata->tg_event)) + pltwhen = PyString_FromString("INSTEAD OF"); + else + { + elog(ERROR, "unrecognized WHEN tg_event: %u", tdata->tg_event); + pltwhen = NULL; /* keep compiler quiet */ + } + PyDict_SetItemString(pltdata, "when", pltwhen); + Py_DECREF(pltwhen); + + if (TRIGGER_FIRED_FOR_ROW(tdata->tg_event)) + { + pltlevel = PyString_FromString("ROW"); + PyDict_SetItemString(pltdata, "level", pltlevel); + Py_DECREF(pltlevel); + + if (TRIGGER_FIRED_BY_INSERT(tdata->tg_event)) + { + pltevent = PyString_FromString("INSERT"); + + PyDict_SetItemString(pltdata, "old", Py_None); + pytnew = PLyDict_FromTuple(&(proc->result), tdata->tg_trigtuple, + tdata->tg_relation->rd_att); + PyDict_SetItemString(pltdata, "new", pytnew); + Py_DECREF(pytnew); + *rv = tdata->tg_trigtuple; + } + else if (TRIGGER_FIRED_BY_DELETE(tdata->tg_event)) + { + pltevent = PyString_FromString("DELETE"); + + PyDict_SetItemString(pltdata, "new", Py_None); + pytold = PLyDict_FromTuple(&(proc->result), tdata->tg_trigtuple, + tdata->tg_relation->rd_att); + PyDict_SetItemString(pltdata, "old", pytold); + Py_DECREF(pytold); + *rv = tdata->tg_trigtuple; + } + else if (TRIGGER_FIRED_BY_UPDATE(tdata->tg_event)) + { + pltevent = PyString_FromString("UPDATE"); + + pytnew = PLyDict_FromTuple(&(proc->result), tdata->tg_newtuple, + tdata->tg_relation->rd_att); + PyDict_SetItemString(pltdata, "new", pytnew); + Py_DECREF(pytnew); + pytold = PLyDict_FromTuple(&(proc->result), tdata->tg_trigtuple, + tdata->tg_relation->rd_att); + PyDict_SetItemString(pltdata, "old", pytold); + Py_DECREF(pytold); + *rv = tdata->tg_newtuple; + } + else + { + elog(ERROR, "unrecognized OP tg_event: %u", tdata->tg_event); + pltevent = NULL; /* keep compiler quiet */ + } + + PyDict_SetItemString(pltdata, "event", pltevent); + Py_DECREF(pltevent); + } + else if (TRIGGER_FIRED_FOR_STATEMENT(tdata->tg_event)) + { + pltlevel = PyString_FromString("STATEMENT"); + PyDict_SetItemString(pltdata, "level", pltlevel); + Py_DECREF(pltlevel); + + PyDict_SetItemString(pltdata, "old", Py_None); + PyDict_SetItemString(pltdata, "new", Py_None); + *rv = NULL; + + if (TRIGGER_FIRED_BY_INSERT(tdata->tg_event)) + pltevent = PyString_FromString("INSERT"); + else if (TRIGGER_FIRED_BY_DELETE(tdata->tg_event)) + pltevent = PyString_FromString("DELETE"); + else if (TRIGGER_FIRED_BY_UPDATE(tdata->tg_event)) + pltevent = PyString_FromString("UPDATE"); + else if (TRIGGER_FIRED_BY_TRUNCATE(tdata->tg_event)) + pltevent = PyString_FromString("TRUNCATE"); + else + { + elog(ERROR, "unrecognized OP tg_event: %u", tdata->tg_event); + pltevent = NULL; /* keep compiler quiet */ + } + + PyDict_SetItemString(pltdata, "event", pltevent); + Py_DECREF(pltevent); + } + else + elog(ERROR, "unrecognized LEVEL tg_event: %u", tdata->tg_event); + + if (tdata->tg_trigger->tgnargs) + { + /* + * all strings... + */ + int i; + PyObject *pltarg; + + pltargs = PyList_New(tdata->tg_trigger->tgnargs); + for (i = 0; i < tdata->tg_trigger->tgnargs; i++) + { + pltarg = PyString_FromString(tdata->tg_trigger->tgargs[i]); + + /* + * stolen, don't Py_DECREF + */ + PyList_SetItem(pltargs, i, pltarg); + } + } + else + { + Py_INCREF(Py_None); + pltargs = Py_None; + } + PyDict_SetItemString(pltdata, "args", pltargs); + Py_DECREF(pltargs); + } + PG_CATCH(); + { + Py_XDECREF(pltdata); + PG_RE_THROW(); + } + PG_END_TRY(); + + return pltdata; +} + +static HeapTuple +PLy_modify_tuple(PLyProcedure *proc, PyObject *pltd, TriggerData *tdata, + HeapTuple otup) +{ + PyObject *volatile plntup; + PyObject *volatile plkeys; + PyObject *volatile platt; + PyObject *volatile plval; + PyObject *volatile plstr; + HeapTuple rtup; + int natts, + i, + attn, + atti; + int *volatile modattrs; + Datum *volatile modvalues; + char *volatile modnulls; + TupleDesc tupdesc; + ErrorContextCallback plerrcontext; + + plerrcontext.callback = plpython_trigger_error_callback; + plerrcontext.previous = error_context_stack; + error_context_stack = &plerrcontext; + + plntup = plkeys = platt = plval = plstr = NULL; + modattrs = NULL; + modvalues = NULL; + modnulls = NULL; + + PG_TRY(); + { + if ((plntup = PyDict_GetItemString(pltd, "new")) == NULL) + ereport(ERROR, + (errmsg("TD[\"new\"] deleted, cannot modify row"))); + if (!PyDict_Check(plntup)) + ereport(ERROR, + (errmsg("TD[\"new\"] is not a dictionary"))); + Py_INCREF(plntup); + + plkeys = PyDict_Keys(plntup); + natts = PyList_Size(plkeys); + + modattrs = (int *) palloc(natts * sizeof(int)); + modvalues = (Datum *) palloc(natts * sizeof(Datum)); + modnulls = (char *) palloc(natts * sizeof(char)); + + tupdesc = tdata->tg_relation->rd_att; + + for (i = 0; i < natts; i++) + { + char *plattstr; + + platt = PyList_GetItem(plkeys, i); + if (PyString_Check(platt)) + plattstr = PyString_AsString(platt); + else if (PyUnicode_Check(platt)) + plattstr = PLyUnicode_AsString(platt); + else + { + ereport(ERROR, + (errmsg("TD[\"new\"] dictionary key at ordinal position %d is not a string", i))); + plattstr = NULL; /* keep compiler quiet */ + } + attn = SPI_fnumber(tupdesc, plattstr); + if (attn == SPI_ERROR_NOATTRIBUTE) + ereport(ERROR, + (errmsg("key \"%s\" found in TD[\"new\"] does not exist as a column in the triggering row", + plattstr))); + atti = attn - 1; + + plval = PyDict_GetItem(plntup, platt); + if (plval == NULL) + elog(FATAL, "Python interpreter is probably corrupted"); + + Py_INCREF(plval); + + modattrs[i] = attn; + + if (tupdesc->attrs[atti]->attisdropped) + { + modvalues[i] = (Datum) 0; + modnulls[i] = 'n'; + } + else if (plval != Py_None) + { + PLyObToDatum *att = &proc->result.out.r.atts[atti]; + + modvalues[i] = (att->func) (att, + tupdesc->attrs[atti]->atttypmod, + plval); + modnulls[i] = ' '; + } + else + { + modvalues[i] = + InputFunctionCall(&proc->result.out.r.atts[atti].typfunc, + NULL, + proc->result.out.r.atts[atti].typioparam, + tupdesc->attrs[atti]->atttypmod); + modnulls[i] = 'n'; + } + + Py_DECREF(plval); + plval = NULL; + } + + rtup = SPI_modifytuple(tdata->tg_relation, otup, natts, + modattrs, modvalues, modnulls); + if (rtup == NULL) + elog(ERROR, "SPI_modifytuple failed: error %d", SPI_result); + } + PG_CATCH(); + { + Py_XDECREF(plntup); + Py_XDECREF(plkeys); + Py_XDECREF(plval); + Py_XDECREF(plstr); + + if (modnulls) + pfree(modnulls); + if (modvalues) + pfree(modvalues); + if (modattrs) + pfree(modattrs); + + PG_RE_THROW(); + } + PG_END_TRY(); + + Py_DECREF(plntup); + Py_DECREF(plkeys); + + pfree(modattrs); + pfree(modvalues); + pfree(modnulls); + + error_context_stack = plerrcontext.previous; + + return rtup; +} + +static void +plpython_trigger_error_callback(void *arg) +{ + if (PLy_curr_procedure) + errcontext("while modifying trigger row"); +} + +/* execute Python code, propagate Python errors to the backend */ +static PyObject * +PLy_procedure_call(PLyProcedure *proc, char *kargs, PyObject *vargs) +{ + PyObject *rv; + int volatile save_subxact_level = list_length(explicit_subtransactions); + + PyDict_SetItemString(proc->globals, kargs, vargs); + + PG_TRY(); + { +#if PY_VERSION_HEX >= 0x03020000 + rv = PyEval_EvalCode(proc->code, + proc->globals, proc->globals); +#else + rv = PyEval_EvalCode((PyCodeObject *) proc->code, + proc->globals, proc->globals); +#endif + + /* + * Since plpy will only let you close subtransactions that you + * started, you cannot *unnest* subtransactions, only *nest* them + * without closing. + */ + Assert(list_length(explicit_subtransactions) >= save_subxact_level); + } + PG_CATCH(); + { + PLy_abort_open_subtransactions(save_subxact_level); + PG_RE_THROW(); + } + PG_END_TRY(); + + PLy_abort_open_subtransactions(save_subxact_level); + + /* If the Python code returned an error, propagate it */ + if (rv == NULL) + PLy_elog(ERROR, NULL); + + return rv; +} + +/* + * Abort lingering subtransactions that have been explicitly started + * by plpy.subtransaction().start() and not properly closed. + */ +static void +PLy_abort_open_subtransactions(int save_subxact_level) +{ + Assert(save_subxact_level >= 0); + + while (list_length(explicit_subtransactions) > save_subxact_level) + { + PLySubtransactionData *subtransactiondata; + + Assert(explicit_subtransactions != NIL); + + ereport(WARNING, + (errmsg("forcibly aborting a subtransaction that has not been exited"))); + + RollbackAndReleaseCurrentSubTransaction(); + + SPI_restore_connection(); + + subtransactiondata = (PLySubtransactionData *) linitial(explicit_subtransactions); + explicit_subtransactions = list_delete_first(explicit_subtransactions); + + MemoryContextSwitchTo(subtransactiondata->oldcontext); + CurrentResourceOwner = subtransactiondata->oldowner; + PLy_free(subtransactiondata); + } +} |