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8032d76b5b
postgres/src/pl/plpython/plpython.c
Peter Eisentraut 8032d76b5b Gettext plural support 
In the backend, I changed only a handful of exemplary or important-looking
instances to make use of the plural support; there is probably more work
there.  For the rest of the source, this should cover all relevant cases.
2009-03-26 22:26:08 +00:00

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/**********************************************************************
* plpython.c - python as a procedural language for PostgreSQL
*
* $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.119 2009/03/26 22:26:08 petere Exp $
*
*********************************************************************
*/
#if defined(_MSC_VER) && defined(_DEBUG)
/* Python uses #pragma to bring in a non-default libpython on VC++ if
* _DEBUG is defined */
#undef _DEBUG
/* Also hide away errcode, since we load Python.h before postgres.h */
#define errcode __msvc_errcode
#include <Python.h>
#undef errcode
#define _DEBUG
#elif defined (_MSC_VER)
#define errcode __msvc_errcode
#include <Python.h>
#undef errcode
#else
#include <Python.h>
#endif
/*
* Py_ssize_t compat for Python <= 2.4
*/
#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
typedef int Py_ssize_t;
#define PY_SSIZE_T_MAX INT_MAX
#define PY_SSIZE_T_MIN INT_MIN
#endif
/*
* PyBool_FromLong is supported from 2.3.
*/
#if PY_VERSION_HEX < 0x02030000
#define PyBool_FromLong(x) PyInt_FromLong(x)
#endif
#include "postgres.h"
/* system stuff */
#include <unistd.h>
#include <fcntl.h>
/* postgreSQL stuff */
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "commands/trigger.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "fmgr.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "parser/parse_type.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
/* define our text domain for translations */
#undef TEXTDOMAIN
#define TEXTDOMAIN PG_TEXTDOMAIN("plpython")
#include <compile.h>
#include <eval.h>
PG_MODULE_MAGIC;
/* convert Postgresql Datum or tuple into a PyObject.
* input to Python. Tuples are converted to dictionary
* objects.
*/
typedef PyObject *(*PLyDatumToObFunc) (const char *);
typedef struct PLyDatumToOb
{
PLyDatumToObFunc func;
FmgrInfo typfunc; /* The type's output function */
Oid typoid; /* The OID of the type */
Oid typioparam;
bool typbyval;
} PLyDatumToOb;
typedef struct PLyTupleToOb
{
PLyDatumToOb *atts;
int natts;
} PLyTupleToOb;
typedef union PLyTypeInput
{
PLyDatumToOb d;
PLyTupleToOb r;
} PLyTypeInput;
/* convert PyObject to a Postgresql Datum or tuple.
* output from Python
*/
typedef struct PLyObToDatum
{
FmgrInfo typfunc; /* The type's input function */
Oid typoid; /* The OID of the type */
Oid typioparam;
bool typbyval;
} PLyObToDatum;
typedef struct PLyObToTuple
{
PLyObToDatum *atts;
int natts;
} PLyObToTuple;
typedef union PLyTypeOutput
{
PLyObToDatum d;
PLyObToTuple r;
} PLyTypeOutput;
/* all we need to move Postgresql data to Python objects,
* and vis versa
*/
typedef struct PLyTypeInfo
{
PLyTypeInput in;
PLyTypeOutput out;
int is_rowtype;
/*
* is_rowtype can be: -1 not known yet (initial state) 0 scalar datatype
* 1 rowtype 2 rowtype, but I/O functions not set up yet
*/
} PLyTypeInfo;
/* cached procedure data */
typedef struct PLyProcedure
{
char *proname; /* SQL name of procedure */
char *pyname; /* Python name of procedure */
TransactionId fn_xmin;
ItemPointerData fn_tid;
bool fn_readonly;
PLyTypeInfo result; /* also used to store info for trigger tuple
* type */
bool is_setof; /* true, if procedure returns result set */
PyObject *setof; /* contents of result set. */
char **argnames; /* Argument names */
PLyTypeInfo args[FUNC_MAX_ARGS];
int nargs;
PyObject *code; /* compiled procedure code */
PyObject *statics; /* data saved across calls, local scope */
PyObject *globals; /* data saved across calls, global scope */
PyObject *me; /* PyCObject containing pointer to this
* PLyProcedure */
} PLyProcedure;
/* Python objects */
typedef struct PLyPlanObject
{
PyObject_HEAD
void *plan; /* return of an SPI_saveplan */
int nargs;
Oid *types;
Datum *values;
PLyTypeInfo *args;
} PLyPlanObject;
typedef struct PLyResultObject
{
PyObject_HEAD
/* HeapTuple *tuples; */
PyObject * nrows; /* number of rows returned by query */
PyObject *rows; /* data rows, or None if no data returned */
PyObject *status; /* query status, SPI_OK_*, or SPI_ERR_* */
} PLyResultObject;
/* function declarations */
/* Two exported functions: first is the magic telling Postgresql
* what function call interface it implements. Second is for
* initialization of the interpreter during library load.
*/
Datum plpython_call_handler(PG_FUNCTION_ARGS);
void _PG_init(void);
PG_FUNCTION_INFO_V1(plpython_call_handler);
/* most of the remaining of the declarations, all static */
/* these should only be called once at the first call
* of plpython_call_handler. initialize the python interpreter
* and global data.
*/
static void PLy_init_interp(void);
static void PLy_init_plpy(void);
/* call PyErr_SetString with a vprint interface and translation support */
static void
PLy_exception_set(PyObject *, const char *,...)
__attribute__((format(printf, 2, 3)));
/* Get the innermost python procedure called from the backend */
static char *PLy_procedure_name(PLyProcedure *);
/* some utility functions */
static void PLy_elog(int, const char *,...)
__attribute__((format(printf, 2, 3)));
static char *PLy_traceback(int *);
static void *PLy_malloc(size_t);
static void *PLy_malloc0(size_t);
static char *PLy_strdup(const char *);
static void PLy_free(void *);
/* sub handlers for functions and triggers */
static Datum PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure *);
static HeapTuple PLy_trigger_handler(FunctionCallInfo fcinfo, PLyProcedure *);
static PyObject *PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure *);
static void PLy_function_delete_args(PLyProcedure *);
static PyObject *PLy_trigger_build_args(FunctionCallInfo fcinfo, PLyProcedure *,
HeapTuple *);
static HeapTuple PLy_modify_tuple(PLyProcedure *, PyObject *,
TriggerData *, HeapTuple);
static PyObject *PLy_procedure_call(PLyProcedure *, char *, PyObject *);
static PLyProcedure *PLy_procedure_get(FunctionCallInfo fcinfo,
Oid tgreloid);
static PLyProcedure *PLy_procedure_create(HeapTuple procTup, Oid tgreloid,
char *key);
static void PLy_procedure_compile(PLyProcedure *, const char *);
static char *PLy_procedure_munge_source(const char *, const char *);
static void PLy_procedure_delete(PLyProcedure *);
static void PLy_typeinfo_init(PLyTypeInfo *);
static void PLy_typeinfo_dealloc(PLyTypeInfo *);
static void PLy_output_datum_func(PLyTypeInfo *, HeapTuple);
static void PLy_output_datum_func2(PLyObToDatum *, HeapTuple);
static void PLy_input_datum_func(PLyTypeInfo *, Oid, HeapTuple);
static void PLy_input_datum_func2(PLyDatumToOb *, Oid, HeapTuple);
static void PLy_output_tuple_funcs(PLyTypeInfo *, TupleDesc);
static void PLy_input_tuple_funcs(PLyTypeInfo *, TupleDesc);
/* conversion functions */
static PyObject *PLyDict_FromTuple(PLyTypeInfo *, HeapTuple, TupleDesc);
static PyObject *PLyBool_FromString(const char *);
static PyObject *PLyFloat_FromString(const char *);
static PyObject *PLyInt_FromString(const char *);
static PyObject *PLyLong_FromString(const char *);
static PyObject *PLyString_FromString(const char *);
static HeapTuple PLyMapping_ToTuple(PLyTypeInfo *, PyObject *);
static HeapTuple PLySequence_ToTuple(PLyTypeInfo *, PyObject *);
static HeapTuple PLyObject_ToTuple(PLyTypeInfo *, PyObject *);
/*
* Currently active plpython function
*/
static PLyProcedure *PLy_curr_procedure = NULL;
/*
* When a callback from Python into PG incurs an error, we temporarily store
* the error information here, and return NULL to the Python interpreter.
* Any further callback attempts immediately fail, and when the Python
* interpreter returns to the calling function, we re-throw the error (even if
* Python thinks it trapped the error and doesn't return NULL). Eventually
* this ought to be improved to let Python code really truly trap the error,
* but that's more of a change from the pre-8.0 semantics than I have time for
* now --- it will only be possible if the callback query is executed inside a
* subtransaction.
*/
static ErrorData *PLy_error_in_progress = NULL;
static PyObject *PLy_interp_globals = NULL;
static PyObject *PLy_interp_safe_globals = NULL;
static PyObject *PLy_procedure_cache = NULL;
/* Python exceptions */
static PyObject *PLy_exc_error = NULL;
static PyObject *PLy_exc_fatal = NULL;
static PyObject *PLy_exc_spi_error = NULL;
/* some globals for the python module */
static char PLy_plan_doc[] = {
"Store a PostgreSQL plan"
};
static char PLy_result_doc[] = {
"Results of a PostgreSQL query"
};
/*
* the function definitions
*/
/*
* This routine is a crock, and so is everyplace that calls it. The problem
* is that the cached form of plpython functions/queries is allocated permanently
* (mostly via malloc()) and never released until backend exit. Subsidiary
* data structures such as fmgr info records therefore must live forever
* as well. A better implementation would store all this stuff in a per-
* function memory context that could be reclaimed at need. In the meantime,
* fmgr_info_cxt must be called specifying TopMemoryContext so that whatever
* it might allocate, and whatever the eventual function might allocate using
* fn_mcxt, will live forever too.
*/
static void
perm_fmgr_info(Oid functionId, FmgrInfo *finfo)
{
fmgr_info_cxt(functionId, finfo, TopMemoryContext);
}
Datum
plpython_call_handler(PG_FUNCTION_ARGS)
{
Datum retval;
PLyProcedure *save_curr_proc;
PLyProcedure *volatile proc = NULL;
if (SPI_connect() != SPI_OK_CONNECT)
elog(ERROR, "SPI_connect failed");
save_curr_proc = PLy_curr_procedure;
PG_TRY();
{
if (CALLED_AS_TRIGGER(fcinfo))
{
TriggerData *tdata = (TriggerData *) fcinfo->context;
HeapTuple trv;
proc = PLy_procedure_get(fcinfo,
RelationGetRelid(tdata->tg_relation));
PLy_curr_procedure = proc;
trv = PLy_trigger_handler(fcinfo, proc);
retval = PointerGetDatum(trv);
}
else
{
proc = PLy_procedure_get(fcinfo, InvalidOid);
PLy_curr_procedure = proc;
retval = PLy_function_handler(fcinfo, proc);
}
}
PG_CATCH();
{
PLy_curr_procedure = save_curr_proc;
if (proc)
{
/* note: Py_DECREF needs braces around it, as of 2003/08 */
Py_DECREF(proc->me);
}
PyErr_Clear();
PG_RE_THROW();
}
PG_END_TRY();
PLy_curr_procedure = save_curr_proc;
Py_DECREF(proc->me);
return retval;
}
/* trigger and function sub handlers
*
* 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.
*/
static HeapTuple
PLy_trigger_handler(FunctionCallInfo fcinfo, PLyProcedure * proc)
{
HeapTuple rv = NULL;
PyObject *volatile plargs = NULL;
PyObject *volatile plrv = NULL;
PG_TRY();
{
plargs = PLy_trigger_build_args(fcinfo, proc, &rv);
plrv = PLy_procedure_call(proc, "TD", plargs);
Assert(plrv != NULL);
Assert(!PLy_error_in_progress);
/*
* 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))
ereport(ERROR,
(errcode(ERRCODE_DATA_EXCEPTION),
errmsg("unexpected return value from trigger procedure"),
errdetail("Expected None or a string.")));
srv = PyString_AsString(plrv);
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;
}
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;
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 *src;
platt = PyList_GetItem(plkeys, i);
if (!PyString_Check(platt))
ereport(ERROR,
(errmsg("name of TD[\"new\"] attribute at ordinal position %d is not a string", i)));
attn = SPI_fnumber(tupdesc, PyString_AsString(platt));
if (attn == SPI_ERROR_NOATTRIBUTE)
ereport(ERROR,
(errmsg("key \"%s\" found in TD[\"new\"] does not exist as a column in the triggering row",
PyString_AsString(platt))));
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)
{
plstr = PyObject_Str(plval);
if (!plstr)
PLy_elog(ERROR, "could not compute string representation of Python object in PL/Python function \"%s\" while modifying trigger row",
proc->proname);
src = PyString_AsString(plstr);
modvalues[i] =
InputFunctionCall(&proc->result.out.r.atts[atti].typfunc,
src,
proc->result.out.r.atts[atti].typioparam,
tupdesc->attrs[atti]->atttypmod);
modnulls[i] = ' ';
Py_DECREF(plstr);
plstr = NULL;
}
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);
return rtup;
}
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
{
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;
}
/* function handler and friends */
static Datum
PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure * proc)
{
Datum rv;
PyObject *volatile plargs = NULL;
PyObject *volatile plrv = NULL;
PyObject *volatile plrv_so = NULL;
char *plrv_sc;
PG_TRY();
{
if (!proc->is_setof || proc->setof == NULL)
{
/* Simple type returning function or first time for SETOF 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);
Assert(!PLy_error_in_progress);
}
/*
* 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");
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);
Py_XDECREF(plrv_so);
PLy_function_delete_args(proc);
if (has_error)
ereport(ERROR,
(errcode(ERRCODE_DATA_EXCEPTION),
errmsg("error fetching next item from iterator")));
fcinfo->isnull = true;
return (Datum) NULL;
}
}
/*
* 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)
{
HeapTuple tuple = NULL;
if (PySequence_Check(plrv))
/* composite type as sequence (tuple, list etc) */
tuple = PLySequence_ToTuple(&proc->result, plrv);
else if (PyMapping_Check(plrv))
/* composite type as mapping (currently only dict) */
tuple = PLyMapping_ToTuple(&proc->result, plrv);
else
/* returned as smth, must provide method __getattr__(name) */
tuple = PLyObject_ToTuple(&proc->result, plrv);
if (tuple != NULL)
{
fcinfo->isnull = false;
rv = HeapTupleGetDatum(tuple);
}
else
{
fcinfo->isnull = true;
rv = (Datum) NULL;
}
}
else
{
fcinfo->isnull = false;
plrv_so = PyObject_Str(plrv);
if (!plrv_so)
PLy_elog(ERROR, "could not create string representation of Python object in PL/Python function \"%s\" while creating return value", proc->proname);
plrv_sc = PyString_AsString(plrv_so);
rv = InputFunctionCall(&proc->result.out.d.typfunc,
plrv_sc,
proc->result.out.d.typioparam,
-1);
}
}
PG_CATCH();
{
Py_XDECREF(plargs);
Py_XDECREF(plrv);
Py_XDECREF(plrv_so);
PG_RE_THROW();
}
PG_END_TRY();
Py_XDECREF(plargs);
Py_DECREF(plrv);
Py_XDECREF(plrv_so);
return rv;
}
static PyObject *
PLy_procedure_call(PLyProcedure * proc, char *kargs, PyObject * vargs)
{
PyObject *rv;
PyDict_SetItemString(proc->globals, kargs, vargs);
rv = PyEval_EvalCode((PyCodeObject *) proc->code,
proc->globals, proc->globals);
/*
* If there was an error in a PG callback, propagate that no matter what
* Python claims about its success.
*/
if (PLy_error_in_progress)
{
ErrorData *edata = PLy_error_in_progress;
PLy_error_in_progress = NULL;
ReThrowError(edata);
}
if (rv == NULL || PyErr_Occurred())
{
Py_XDECREF(rv);
PLy_elog(ERROR, "PL/Python function \"%s\" failed", proc->proname);
}
return rv;
}
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
{
char *ct;
ct = OutputFunctionCall(&(proc->args[i].in.d.typfunc),
fcinfo->arg[i]);
arg = (proc->args[i].in.d.func) (ct);
pfree(ct);
}
}
if (arg == NULL)
{
Py_INCREF(Py_None);
arg = Py_None;
}
if (PyList_SetItem(args, i, arg) == -1 ||
(proc->argnames &&
PyDict_SetItemString(proc->globals, proc->argnames[i], arg) == -1))
PLy_elog(ERROR, "PyDict_SetItemString() failed for PL/Python function \"%s\" while setting up arguments", proc->proname);
arg = NULL;
}
}
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++)
PyDict_DelItemString(proc->globals, proc->argnames[i]);
}
/*
* PLyProcedure functions
*/
/* PLy_procedure_get: returns a cached PLyProcedure, or creates, stores and
* returns a new PLyProcedure. fcinfo is the call info, tgreloid is the
* relation OID when calling a trigger, or InvalidOid (zero) for ordinary
* function calls.
*/
static PLyProcedure *
PLy_procedure_get(FunctionCallInfo fcinfo, Oid tgreloid)
{
Oid fn_oid;
HeapTuple procTup;
char key[128];
PyObject *plproc;
PLyProcedure *proc = NULL;
int rv;
fn_oid = fcinfo->flinfo->fn_oid;
procTup = SearchSysCache(PROCOID,
ObjectIdGetDatum(fn_oid),
0, 0, 0);
if (!HeapTupleIsValid(procTup))
elog(ERROR, "cache lookup failed for function %u", fn_oid);
rv = snprintf(key, sizeof(key), "%u_%u", fn_oid, tgreloid);
if (rv >= sizeof(key) || rv < 0)
elog(ERROR, "key too long");
plproc = PyDict_GetItemString(PLy_procedure_cache, key);
if (plproc != NULL)
{
Py_INCREF(plproc);
if (!PyCObject_Check(plproc))
elog(FATAL, "expected a PyCObject, didn't get one");
proc = PyCObject_AsVoidPtr(plproc);
if (proc->me != plproc)
elog(FATAL, "proc->me != plproc");
/* did we find an up-to-date cache entry? */
if (proc->fn_xmin != HeapTupleHeaderGetXmin(procTup->t_data) ||
!ItemPointerEquals(&proc->fn_tid, &procTup->t_self))
{
Py_DECREF(plproc);
proc = NULL;
}
}
if (proc == NULL)
proc = PLy_procedure_create(procTup, tgreloid, key);
if (OidIsValid(tgreloid))
{
/*
* 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.
*/
TriggerData *tdata = (TriggerData *) fcinfo->context;
Assert(CALLED_AS_TRIGGER(fcinfo));
PLy_input_tuple_funcs(&(proc->result), tdata->tg_relation->rd_att);
PLy_output_tuple_funcs(&(proc->result), tdata->tg_relation->rd_att);
}
ReleaseSysCache(procTup);
return proc;
}
static PLyProcedure *
PLy_procedure_create(HeapTuple procTup, Oid tgreloid, char *key)
{
char procName[NAMEDATALEN + 256];
Form_pg_proc procStruct;
PLyProcedure *volatile proc;
char *volatile procSource = NULL;
Datum prosrcdatum;
bool isnull;
int i,
rv;
procStruct = (Form_pg_proc) GETSTRUCT(procTup);
if (OidIsValid(tgreloid))
rv = snprintf(procName, sizeof(procName),
"__plpython_procedure_%s_%u_trigger_%u",
NameStr(procStruct->proname),
HeapTupleGetOid(procTup),
tgreloid);
else
rv = snprintf(procName, sizeof(procName),
"__plpython_procedure_%s_%u",
NameStr(procStruct->proname),
HeapTupleGetOid(procTup));
if (rv >= sizeof(procName) || rv < 0)
elog(ERROR, "procedure name would overrun buffer");
proc = PLy_malloc(sizeof(PLyProcedure));
proc->proname = PLy_strdup(NameStr(procStruct->proname));
proc->pyname = PLy_strdup(procName);
proc->fn_xmin = HeapTupleHeaderGetXmin(procTup->t_data);
proc->fn_tid = procTup->t_self;
/* Remember if function is STABLE/IMMUTABLE */
proc->fn_readonly =
(procStruct->provolatile != PROVOLATILE_VOLATILE);
PLy_typeinfo_init(&proc->result);
for (i = 0; i < FUNC_MAX_ARGS; i++)
PLy_typeinfo_init(&proc->args[i]);
proc->nargs = 0;
proc->code = proc->statics = NULL;
proc->globals = proc->me = NULL;
proc->is_setof = procStruct->proretset;
proc->setof = NULL;
proc->argnames = NULL;
PG_TRY();
{
/*
* get information required for output conversion of the return value,
* but only if this isn't a trigger.
*/
if (!OidIsValid(tgreloid))
{
HeapTuple rvTypeTup;
Form_pg_type rvTypeStruct;
rvTypeTup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(procStruct->prorettype),
0, 0, 0);
if (!HeapTupleIsValid(rvTypeTup))
elog(ERROR, "cache lookup failed for type %u",
procStruct->prorettype);
rvTypeStruct = (Form_pg_type) GETSTRUCT(rvTypeTup);
/* Disallow pseudotype result, except for void */
if (rvTypeStruct->typtype == TYPTYPE_PSEUDO &&
procStruct->prorettype != VOIDOID)
{
if (procStruct->prorettype == TRIGGEROID)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("trigger functions can only be called as triggers")));
else
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("PL/Python functions cannot return type %s",
format_type_be(procStruct->prorettype))));
}
if (rvTypeStruct->typtype == TYPTYPE_COMPOSITE)
{
/*
* Tuple: set up later, during first call to
* PLy_function_handler
*/
proc->result.out.d.typoid = procStruct->prorettype;
proc->result.is_rowtype = 2;
}
else
PLy_output_datum_func(&proc->result, rvTypeTup);
ReleaseSysCache(rvTypeTup);
}
/*
* Now get information required for input conversion of the
* procedure's arguments. Note that we ignore output arguments
* here --- since we don't support returning record, and that was
* already checked above, there's no need to worry about multiple
* output arguments.
*/
if (procStruct->pronargs)
{
Oid *types;
char **names,
*modes;
int i,
pos,
total;
/* extract argument type info from the pg_proc tuple */
total = get_func_arg_info(procTup, &types, &names, &modes);
/* count number of in+inout args into proc->nargs */
if (modes == NULL)
proc->nargs = total;
else
{
/* proc->nargs was initialized to 0 above */
for (i = 0; i < total; i++)
{
if (modes[i] != PROARGMODE_OUT &&
modes[i] != PROARGMODE_TABLE)
(proc->nargs)++;
}
}
proc->argnames = (char **) PLy_malloc0(sizeof(char *) * proc->nargs);
for (i = pos = 0; i < total; i++)
{
HeapTuple argTypeTup;
Form_pg_type argTypeStruct;
if (modes &&
(modes[i] == PROARGMODE_OUT ||
modes[i] == PROARGMODE_TABLE))
continue; /* skip OUT arguments */
Assert(types[i] == procStruct->proargtypes.values[pos]);
argTypeTup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(types[i]),
0, 0, 0);
if (!HeapTupleIsValid(argTypeTup))
elog(ERROR, "cache lookup failed for type %u", types[i]);
argTypeStruct = (Form_pg_type) GETSTRUCT(argTypeTup);
/* check argument type is OK, set up I/O function info */
switch (argTypeStruct->typtype)
{
case TYPTYPE_PSEUDO:
/* Disallow pseudotype argument */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("PL/Python functions cannot accept type %s",
format_type_be(types[i]))));
break;
case TYPTYPE_COMPOSITE:
/* we'll set IO funcs at first call */
proc->args[pos].is_rowtype = 2;
break;
default:
PLy_input_datum_func(&(proc->args[pos]),
types[i],
argTypeTup);
break;
}
/* get argument name */
proc->argnames[pos] = names ? PLy_strdup(names[i]) : NULL;
ReleaseSysCache(argTypeTup);
pos++;
}
}
/*
* get the text of the function.
*/
prosrcdatum = SysCacheGetAttr(PROCOID, procTup,
Anum_pg_proc_prosrc, &isnull);
if (isnull)
elog(ERROR, "null prosrc");
procSource = TextDatumGetCString(prosrcdatum);
PLy_procedure_compile(proc, procSource);
pfree(procSource);
proc->me = PyCObject_FromVoidPtr(proc, NULL);
PyDict_SetItemString(PLy_procedure_cache, key, proc->me);
}
PG_CATCH();
{
PLy_procedure_delete(proc);
if (procSource)
pfree(procSource);
PG_RE_THROW();
}
PG_END_TRY();
return proc;
}
static void
PLy_procedure_compile(PLyProcedure * proc, const char *src)
{
PyObject *crv = NULL;
char *msrc;
proc->globals = PyDict_Copy(PLy_interp_globals);
/*
* SD is private preserved data between calls. GD is global data shared by
* all functions
*/
proc->statics = PyDict_New();
PyDict_SetItemString(proc->globals, "SD", proc->statics);
/*
* insert the function code into the interpreter
*/
msrc = PLy_procedure_munge_source(proc->pyname, src);
crv = PyRun_String(msrc, Py_file_input, proc->globals, NULL);
free(msrc);
if (crv != NULL && (!PyErr_Occurred()))
{
int clen;
char call[NAMEDATALEN + 256];
Py_DECREF(crv);
/*
* compile a call to the function
*/
clen = snprintf(call, sizeof(call), "%s()", proc->pyname);
if (clen < 0 || clen >= sizeof(call))
elog(ERROR, "string would overflow buffer");
proc->code = Py_CompileString(call, "<string>", Py_eval_input);
if (proc->code != NULL && (!PyErr_Occurred()))
return;
}
else
Py_XDECREF(crv);
PLy_elog(ERROR, "could not compile PL/Python function \"%s\"", proc->proname);
}
static char *
PLy_procedure_munge_source(const char *name, const char *src)
{
char *mrc,
*mp;
const char *sp;
size_t mlen,
plen;
/*
* room for function source and the def statement
*/
mlen = (strlen(src) * 2) + strlen(name) + 16;
mrc = PLy_malloc(mlen);
plen = snprintf(mrc, mlen, "def %s():\n\t", name);
Assert(plen >= 0 && plen < mlen);
sp = src;
mp = mrc + plen;
while (*sp != '\0')
{
if (*sp == '\r' && *(sp + 1) == '\n')
sp++;
if (*sp == '\n' || *sp == '\r')
{
*mp++ = '\n';
*mp++ = '\t';
sp++;
}
else
*mp++ = *sp++;
}
*mp++ = '\n';
*mp++ = '\n';
*mp = '\0';
if (mp > (mrc + mlen))
elog(FATAL, "buffer overrun in PLy_munge_source");
return mrc;
}
static void
PLy_procedure_delete(PLyProcedure * proc)
{
int i;
Py_XDECREF(proc->code);
Py_XDECREF(proc->statics);
Py_XDECREF(proc->globals);
Py_XDECREF(proc->me);
if (proc->proname)
PLy_free(proc->proname);
if (proc->pyname)
PLy_free(proc->pyname);
for (i = 0; i < proc->nargs; i++)
{
if (proc->args[i].is_rowtype == 1)
{
if (proc->args[i].in.r.atts)
PLy_free(proc->args[i].in.r.atts);
if (proc->args[i].out.r.atts)
PLy_free(proc->args[i].out.r.atts);
}
if (proc->argnames && proc->argnames[i])
PLy_free(proc->argnames[i]);
}
if (proc->argnames)
PLy_free(proc->argnames);
}
/*
* Conversion functions. Remember output from Python is input to
* PostgreSQL, and vice versa.
*/
static void
PLy_input_tuple_funcs(PLyTypeInfo * arg, TupleDesc desc)
{
int i;
if (arg->is_rowtype == 0)
elog(ERROR, "PLyTypeInfo struct is initialized for a Datum");
arg->is_rowtype = 1;
if (arg->in.r.natts != desc->natts)
{
if (arg->in.r.atts)
PLy_free(arg->in.r.atts);
arg->in.r.natts = desc->natts;
arg->in.r.atts = PLy_malloc0(desc->natts * sizeof(PLyDatumToOb));
}
for (i = 0; i < desc->natts; i++)
{
HeapTuple typeTup;
if (desc->attrs[i]->attisdropped)
continue;
if (arg->in.r.atts[i].typoid == desc->attrs[i]->atttypid)
continue; /* already set up this entry */
typeTup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(desc->attrs[i]->atttypid),
0, 0, 0);
if (!HeapTupleIsValid(typeTup))
elog(ERROR, "cache lookup failed for type %u",
desc->attrs[i]->atttypid);
PLy_input_datum_func2(&(arg->in.r.atts[i]),
desc->attrs[i]->atttypid,
typeTup);
ReleaseSysCache(typeTup);
}
}
static void
PLy_output_tuple_funcs(PLyTypeInfo * arg, TupleDesc desc)
{
int i;
if (arg->is_rowtype == 0)
elog(ERROR, "PLyTypeInfo struct is initialized for a Datum");
arg->is_rowtype = 1;
if (arg->out.r.natts != desc->natts)
{
if (arg->out.r.atts)
PLy_free(arg->out.r.atts);
arg->out.r.natts = desc->natts;
arg->out.r.atts = PLy_malloc0(desc->natts * sizeof(PLyDatumToOb));
}
for (i = 0; i < desc->natts; i++)
{
HeapTuple typeTup;
if (desc->attrs[i]->attisdropped)
continue;
if (arg->out.r.atts[i].typoid == desc->attrs[i]->atttypid)
continue; /* already set up this entry */
typeTup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(desc->attrs[i]->atttypid),
0, 0, 0);
if (!HeapTupleIsValid(typeTup))
elog(ERROR, "cache lookup failed for type %u",
desc->attrs[i]->atttypid);
PLy_output_datum_func2(&(arg->out.r.atts[i]), typeTup);
ReleaseSysCache(typeTup);
}
}
static void
PLy_output_datum_func(PLyTypeInfo * arg, HeapTuple typeTup)
{
if (arg->is_rowtype > 0)
elog(ERROR, "PLyTypeInfo struct is initialized for a Tuple");
arg->is_rowtype = 0;
PLy_output_datum_func2(&(arg->out.d), typeTup);
}
static void
PLy_output_datum_func2(PLyObToDatum * arg, HeapTuple typeTup)
{
Form_pg_type typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
perm_fmgr_info(typeStruct->typinput, &arg->typfunc);
arg->typoid = HeapTupleGetOid(typeTup);
arg->typioparam = getTypeIOParam(typeTup);
arg->typbyval = typeStruct->typbyval;
}
static void
PLy_input_datum_func(PLyTypeInfo * arg, Oid typeOid, HeapTuple typeTup)
{
if (arg->is_rowtype > 0)
elog(ERROR, "PLyTypeInfo struct is initialized for Tuple");
arg->is_rowtype = 0;
PLy_input_datum_func2(&(arg->in.d), typeOid, typeTup);
}
static void
PLy_input_datum_func2(PLyDatumToOb * arg, Oid typeOid, HeapTuple typeTup)
{
Form_pg_type typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
/* Get the type's conversion information */
perm_fmgr_info(typeStruct->typoutput, &arg->typfunc);
arg->typoid = HeapTupleGetOid(typeTup);
arg->typioparam = getTypeIOParam(typeTup);
arg->typbyval = typeStruct->typbyval;
/* Determine which kind of Python object we will convert to */
switch (typeOid)
{
case BOOLOID:
arg->func = PLyBool_FromString;
break;
case FLOAT4OID:
case FLOAT8OID:
case NUMERICOID:
arg->func = PLyFloat_FromString;
break;
case INT2OID:
case INT4OID:
arg->func = PLyInt_FromString;
break;
case INT8OID:
arg->func = PLyLong_FromString;
break;
default:
arg->func = PLyString_FromString;
break;
}
}
static void
PLy_typeinfo_init(PLyTypeInfo * arg)
{
arg->is_rowtype = -1;
arg->in.r.natts = arg->out.r.natts = 0;
arg->in.r.atts = NULL;
arg->out.r.atts = NULL;
}
static void
PLy_typeinfo_dealloc(PLyTypeInfo * arg)
{
if (arg->is_rowtype == 1)
{
if (arg->in.r.atts)
PLy_free(arg->in.r.atts);
if (arg->out.r.atts)
PLy_free(arg->out.r.atts);
}
}
/* assumes that a bool is always returned as a 't' or 'f' */
static PyObject *
PLyBool_FromString(const char *src)
{
/*
* We would like to use Py_RETURN_TRUE and Py_RETURN_FALSE here for
* generating SQL from trigger functions, but those are only supported in
* Python >= 2.3, and we support older versions.
* http://docs.python.org/api/boolObjects.html
*/
if (src[0] == 't')
return PyBool_FromLong(1);
return PyBool_FromLong(0);
}
static PyObject *
PLyFloat_FromString(const char *src)
{
double v;
char *eptr;
errno = 0;
v = strtod(src, &eptr);
if (*eptr != '\0' || errno)
return NULL;
return PyFloat_FromDouble(v);
}
static PyObject *
PLyInt_FromString(const char *src)
{
long v;
char *eptr;
errno = 0;
v = strtol(src, &eptr, 0);
if (*eptr != '\0' || errno)
return NULL;
return PyInt_FromLong(v);
}
static PyObject *
PLyLong_FromString(const char *src)
{
return PyLong_FromString((char *) src, NULL, 0);
}
static PyObject *
PLyString_FromString(const char *src)
{
return PyString_FromString(src);
}
static PyObject *
PLyDict_FromTuple(PLyTypeInfo * info, HeapTuple tuple, TupleDesc desc)
{
PyObject *volatile dict;
int i;
if (info->is_rowtype != 1)
elog(ERROR, "PLyTypeInfo structure describes a datum");
dict = PyDict_New();
if (dict == NULL)
PLy_elog(ERROR, "could not create new dictionary");
PG_TRY();
{
for (i = 0; i < info->in.r.natts; i++)
{
char *key,
*vsrc;
Datum vattr;
bool is_null;
PyObject *value;
if (desc->attrs[i]->attisdropped)
continue;
key = NameStr(desc->attrs[i]->attname);
vattr = heap_getattr(tuple, (i + 1), desc, &is_null);
if (is_null || info->in.r.atts[i].func == NULL)
PyDict_SetItemString(dict, key, Py_None);
else
{
vsrc = OutputFunctionCall(&info->in.r.atts[i].typfunc,
vattr);
/*
* no exceptions allowed
*/
value = info->in.r.atts[i].func(vsrc);
pfree(vsrc);
PyDict_SetItemString(dict, key, value);
Py_DECREF(value);
}
}
}
PG_CATCH();
{
Py_DECREF(dict);
PG_RE_THROW();
}
PG_END_TRY();
return dict;
}
static HeapTuple
PLyMapping_ToTuple(PLyTypeInfo * info, PyObject * mapping)
{
TupleDesc desc;
HeapTuple tuple;
Datum *values;
bool *nulls;
volatile int i;
Assert(PyMapping_Check(mapping));
desc = lookup_rowtype_tupdesc(info->out.d.typoid, -1);
if (info->is_rowtype == 2)
PLy_output_tuple_funcs(info, desc);
Assert(info->is_rowtype == 1);
/* Build tuple */
values = palloc(sizeof(Datum) * desc->natts);
nulls = palloc(sizeof(bool) * desc->natts);
for (i = 0; i < desc->natts; ++i)
{
char *key;
PyObject *volatile value,
*volatile so;
key = NameStr(desc->attrs[i]->attname);
value = so = NULL;
PG_TRY();
{
value = PyMapping_GetItemString(mapping, key);
if (value == Py_None)
{
values[i] = (Datum) NULL;
nulls[i] = true;
}
else if (value)
{
char *valuestr;
so = PyObject_Str(value);
if (so == NULL)
PLy_elog(ERROR, "could not compute string representation of Python object");
valuestr = PyString_AsString(so);
values[i] = InputFunctionCall(&info->out.r.atts[i].typfunc
,valuestr
,info->out.r.atts[i].typioparam
,-1);
Py_DECREF(so);
so = NULL;
nulls[i] = false;
}
else
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("key \"%s\" not found in mapping", key),
errhint("To return null in a column, "
"add the value None to the mapping with the key named after the column.")));
Py_XDECREF(value);
value = NULL;
}
PG_CATCH();
{
Py_XDECREF(so);
Py_XDECREF(value);
PG_RE_THROW();
}
PG_END_TRY();
}
tuple = heap_form_tuple(desc, values, nulls);
ReleaseTupleDesc(desc);
pfree(values);
pfree(nulls);
return tuple;
}
static HeapTuple
PLySequence_ToTuple(PLyTypeInfo * info, PyObject * sequence)
{
TupleDesc desc;
HeapTuple tuple;
Datum *values;
bool *nulls;
volatile int i;
Assert(PySequence_Check(sequence));
/*
* Check that sequence length is exactly same as PG tuple's. We actually
* can ignore exceeding items or assume missing ones as null but to avoid
* plpython developer's errors we are strict here
*/
desc = lookup_rowtype_tupdesc(info->out.d.typoid, -1);
if (PySequence_Length(sequence) != desc->natts)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("length of returned sequence did not match number of columns in row")));
if (info->is_rowtype == 2)
PLy_output_tuple_funcs(info, desc);
Assert(info->is_rowtype == 1);
/* Build tuple */
values = palloc(sizeof(Datum) * desc->natts);
nulls = palloc(sizeof(bool) * desc->natts);
for (i = 0; i < desc->natts; ++i)
{
PyObject *volatile value,
*volatile so;
value = so = NULL;
PG_TRY();
{
value = PySequence_GetItem(sequence, i);
Assert(value);
if (value == Py_None)
{
values[i] = (Datum) NULL;
nulls[i] = true;
}
else if (value)
{
char *valuestr;
so = PyObject_Str(value);
if (so == NULL)
PLy_elog(ERROR, "could not compute string representation of Python object");
valuestr = PyString_AsString(so);
values[i] = InputFunctionCall(&info->out.r.atts[i].typfunc
,valuestr
,info->out.r.atts[i].typioparam
,-1);
Py_DECREF(so);
so = NULL;
nulls[i] = false;
}
Py_XDECREF(value);
value = NULL;
}
PG_CATCH();
{
Py_XDECREF(so);
Py_XDECREF(value);
PG_RE_THROW();
}
PG_END_TRY();
}
tuple = heap_form_tuple(desc, values, nulls);
ReleaseTupleDesc(desc);
pfree(values);
pfree(nulls);
return tuple;
}
static HeapTuple
PLyObject_ToTuple(PLyTypeInfo * info, PyObject * object)
{
TupleDesc desc;
HeapTuple tuple;
Datum *values;
bool *nulls;
volatile int i;
desc = lookup_rowtype_tupdesc(info->out.d.typoid, -1);
if (info->is_rowtype == 2)
PLy_output_tuple_funcs(info, desc);
Assert(info->is_rowtype == 1);
/* Build tuple */
values = palloc(sizeof(Datum) * desc->natts);
nulls = palloc(sizeof(bool) * desc->natts);
for (i = 0; i < desc->natts; ++i)
{
char *key;
PyObject *volatile value,
*volatile so;
key = NameStr(desc->attrs[i]->attname);
value = so = NULL;
PG_TRY();
{
value = PyObject_GetAttrString(object, key);
if (value == Py_None)
{
values[i] = (Datum) NULL;
nulls[i] = true;
}
else if (value)
{
char *valuestr;
so = PyObject_Str(value);
if (so == NULL)
PLy_elog(ERROR, "could not compute string representation of Python object");
valuestr = PyString_AsString(so);
values[i] = InputFunctionCall(&info->out.r.atts[i].typfunc
,valuestr
,info->out.r.atts[i].typioparam
,-1);
Py_DECREF(so);
so = NULL;
nulls[i] = false;
}
else
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("attribute \"%s\" does not exist in Python object", key),
errhint("To return null in a column, "
"let the returned object have an attribute named "
"after column with value None.")));
Py_XDECREF(value);
value = NULL;
}
PG_CATCH();
{
Py_XDECREF(so);
Py_XDECREF(value);
PG_RE_THROW();
}
PG_END_TRY();
}
tuple = heap_form_tuple(desc, values, nulls);
ReleaseTupleDesc(desc);
pfree(values);
pfree(nulls);
return tuple;
}
/* initialization, some python variables function declared here */
/* interface to postgresql elog */
static PyObject *PLy_debug(PyObject *, PyObject *);
static PyObject *PLy_log(PyObject *, PyObject *);
static PyObject *PLy_info(PyObject *, PyObject *);
static PyObject *PLy_notice(PyObject *, PyObject *);
static PyObject *PLy_warning(PyObject *, PyObject *);
static PyObject *PLy_error(PyObject *, PyObject *);
static PyObject *PLy_fatal(PyObject *, PyObject *);
/* PLyPlanObject, PLyResultObject and SPI interface */
#define is_PLyPlanObject(x) ((x)->ob_type == &PLy_PlanType)
static PyObject *PLy_plan_new(void);
static void PLy_plan_dealloc(PyObject *);
static PyObject *PLy_plan_getattr(PyObject *, char *);
static PyObject *PLy_plan_status(PyObject *, PyObject *);
static PyObject *PLy_result_new(void);
static void PLy_result_dealloc(PyObject *);
static PyObject *PLy_result_getattr(PyObject *, char *);
static PyObject *PLy_result_nrows(PyObject *, PyObject *);
static PyObject *PLy_result_status(PyObject *, PyObject *);
static Py_ssize_t PLy_result_length(PyObject *);
static PyObject *PLy_result_item(PyObject *, Py_ssize_t);
static PyObject *PLy_result_slice(PyObject *, Py_ssize_t, Py_ssize_t);
static int PLy_result_ass_item(PyObject *, Py_ssize_t, PyObject *);
static int PLy_result_ass_slice(PyObject *, Py_ssize_t, Py_ssize_t, PyObject *);
static PyObject *PLy_spi_prepare(PyObject *, PyObject *);
static PyObject *PLy_spi_execute(PyObject *, PyObject *);
static PyObject *PLy_spi_execute_query(char *query, long limit);
static PyObject *PLy_spi_execute_plan(PyObject *, PyObject *, long);
static PyObject *PLy_spi_execute_fetch_result(SPITupleTable *, int, int);
static PyTypeObject PLy_PlanType = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"PLyPlan", /* tp_name */
sizeof(PLyPlanObject), /* tp_size */
0, /* tp_itemsize */
/*
* methods
*/
PLy_plan_dealloc, /* tp_dealloc */
0, /* tp_print */
PLy_plan_getattr, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
PLy_plan_doc, /* tp_doc */
};
static PyMethodDef PLy_plan_methods[] = {
{"status", PLy_plan_status, METH_VARARGS, NULL},
{NULL, NULL, 0, NULL}
};
static PySequenceMethods PLy_result_as_sequence = {
PLy_result_length, /* sq_length */
NULL, /* sq_concat */
NULL, /* sq_repeat */
PLy_result_item, /* sq_item */
PLy_result_slice, /* sq_slice */
PLy_result_ass_item, /* sq_ass_item */
PLy_result_ass_slice, /* sq_ass_slice */
};
static PyTypeObject PLy_ResultType = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"PLyResult", /* tp_name */
sizeof(PLyResultObject), /* tp_size */
0, /* tp_itemsize */
/*
* methods
*/
PLy_result_dealloc, /* tp_dealloc */
0, /* tp_print */
PLy_result_getattr, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
&PLy_result_as_sequence, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
PLy_result_doc, /* tp_doc */
};
static PyMethodDef PLy_result_methods[] = {
{"nrows", PLy_result_nrows, METH_VARARGS, NULL},
{"status", PLy_result_status, METH_VARARGS, NULL},
{NULL, NULL, 0, NULL}
};
static PyMethodDef PLy_methods[] = {
/*
* logging methods
*/
{"debug", PLy_debug, METH_VARARGS, NULL},
{"log", PLy_log, METH_VARARGS, NULL},
{"info", PLy_info, METH_VARARGS, NULL},
{"notice", PLy_notice, METH_VARARGS, NULL},
{"warning", PLy_warning, METH_VARARGS, NULL},
{"error", PLy_error, METH_VARARGS, NULL},
{"fatal", PLy_fatal, METH_VARARGS, NULL},
/*
* create a stored plan
*/
{"prepare", PLy_spi_prepare, METH_VARARGS, NULL},
/*
* execute a plan or query
*/
{"execute", PLy_spi_execute, METH_VARARGS, NULL},
{NULL, NULL, 0, NULL}
};
/* plan object methods */
static PyObject *
PLy_plan_new(void)
{
PLyPlanObject *ob;
if ((ob = PyObject_NEW(PLyPlanObject, &PLy_PlanType)) == NULL)
return NULL;
ob->plan = NULL;
ob->nargs = 0;
ob->types = NULL;
ob->args = NULL;
return (PyObject *) ob;
}
static void
PLy_plan_dealloc(PyObject * arg)
{
PLyPlanObject *ob = (PLyPlanObject *) arg;
if (ob->plan)
SPI_freeplan(ob->plan);
if (ob->types)
PLy_free(ob->types);
if (ob->args)
{
int i;
for (i = 0; i < ob->nargs; i++)
PLy_typeinfo_dealloc(&ob->args[i]);
PLy_free(ob->args);
}
arg->ob_type->tp_free(arg);
}
static PyObject *
PLy_plan_getattr(PyObject * self, char *name)
{
return Py_FindMethod(PLy_plan_methods, self, name);
}
static PyObject *
PLy_plan_status(PyObject * self, PyObject * args)
{
if (PyArg_ParseTuple(args, ""))
{
Py_INCREF(Py_True);
return Py_True;
/* return PyInt_FromLong(self->status); */
}
PLy_exception_set(PLy_exc_error, "plan.status takes no arguments");
return NULL;
}
/* result object methods */
static PyObject *
PLy_result_new(void)
{
PLyResultObject *ob;
if ((ob = PyObject_NEW(PLyResultObject, &PLy_ResultType)) == NULL)
return NULL;
/* ob->tuples = NULL; */
Py_INCREF(Py_None);
ob->status = Py_None;
ob->nrows = PyInt_FromLong(-1);
ob->rows = PyList_New(0);
return (PyObject *) ob;
}
static void
PLy_result_dealloc(PyObject * arg)
{
PLyResultObject *ob = (PLyResultObject *) arg;
Py_XDECREF(ob->nrows);
Py_XDECREF(ob->rows);
Py_XDECREF(ob->status);
arg->ob_type->tp_free(arg);
}
static PyObject *
PLy_result_getattr(PyObject * self, char *name)
{
return Py_FindMethod(PLy_result_methods, self, name);
}
static PyObject *
PLy_result_nrows(PyObject * self, PyObject * args)
{
PLyResultObject *ob = (PLyResultObject *) self;
Py_INCREF(ob->nrows);
return ob->nrows;
}
static PyObject *
PLy_result_status(PyObject * self, PyObject * args)
{
PLyResultObject *ob = (PLyResultObject *) self;
Py_INCREF(ob->status);
return ob->status;
}
static Py_ssize_t
PLy_result_length(PyObject * arg)
{
PLyResultObject *ob = (PLyResultObject *) arg;
return PyList_Size(ob->rows);
}
static PyObject *
PLy_result_item(PyObject * arg, Py_ssize_t idx)
{
PyObject *rv;
PLyResultObject *ob = (PLyResultObject *) arg;
rv = PyList_GetItem(ob->rows, idx);
if (rv != NULL)
Py_INCREF(rv);
return rv;
}
static int
PLy_result_ass_item(PyObject * arg, Py_ssize_t idx, PyObject * item)
{
int rv;
PLyResultObject *ob = (PLyResultObject *) arg;
Py_INCREF(item);
rv = PyList_SetItem(ob->rows, idx, item);
return rv;
}
static PyObject *
PLy_result_slice(PyObject * arg, Py_ssize_t lidx, Py_ssize_t hidx)
{
PyObject *rv;
PLyResultObject *ob = (PLyResultObject *) arg;
rv = PyList_GetSlice(ob->rows, lidx, hidx);
if (rv == NULL)
return NULL;
Py_INCREF(rv);
return rv;
}
static int
PLy_result_ass_slice(PyObject * arg, Py_ssize_t lidx, Py_ssize_t hidx, PyObject * slice)
{
int rv;
PLyResultObject *ob = (PLyResultObject *) arg;
rv = PyList_SetSlice(ob->rows, lidx, hidx, slice);
return rv;
}
/* SPI interface */
static PyObject *
PLy_spi_prepare(PyObject * self, PyObject * args)
{
PLyPlanObject *plan;
PyObject *list = NULL;
PyObject *volatile optr = NULL;
char *query;
void *tmpplan;
MemoryContext oldcontext;
/* Can't execute more if we have an unhandled error */
if (PLy_error_in_progress)
{
PLy_exception_set(PLy_exc_error, "transaction aborted");
return NULL;
}
if (!PyArg_ParseTuple(args, "s|O", &query, &list))
{
PLy_exception_set(PLy_exc_spi_error,
"invalid arguments for plpy.prepare");
return NULL;
}
if (list && (!PySequence_Check(list)))
{
PLy_exception_set(PLy_exc_spi_error,
"second argument of plpy.prepare must be a sequence");
return NULL;
}
if ((plan = (PLyPlanObject *) PLy_plan_new()) == NULL)
return NULL;
oldcontext = CurrentMemoryContext;
PG_TRY();
{
if (list != NULL)
{
int nargs,
i;
nargs = PySequence_Length(list);
if (nargs > 0)
{
plan->nargs = nargs;
plan->types = PLy_malloc(sizeof(Oid) * nargs);
plan->values = PLy_malloc(sizeof(Datum) * nargs);
plan->args = PLy_malloc(sizeof(PLyTypeInfo) * nargs);
/*
* the other loop might throw an exception, if PLyTypeInfo
* member isn't properly initialized the Py_DECREF(plan) will
* go boom
*/
for (i = 0; i < nargs; i++)
{
PLy_typeinfo_init(&plan->args[i]);
plan->values[i] = PointerGetDatum(NULL);
}
for (i = 0; i < nargs; i++)
{
char *sptr;
HeapTuple typeTup;
Oid typeId;
int32 typmod;
Form_pg_type typeStruct;
optr = PySequence_GetItem(list, i);
if (!PyString_Check(optr))
ereport(ERROR,
(errmsg("plpy.prepare: type name at ordinal position %d is not a string", i)));
sptr = PyString_AsString(optr);
/********************************************************
* Resolve argument type names and then look them up by
* oid in the system cache, and remember the required
*information for input conversion.
********************************************************/
parseTypeString(sptr, &typeId, &typmod);
typeTup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typeId),
0, 0, 0);
if (!HeapTupleIsValid(typeTup))
elog(ERROR, "cache lookup failed for type %u", typeId);
Py_DECREF(optr);
optr = NULL; /* this is important */
plan->types[i] = typeId;
typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
if (typeStruct->typtype != TYPTYPE_COMPOSITE)
PLy_output_datum_func(&plan->args[i], typeTup);
else
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("plpy.prepare does not support composite types")));
ReleaseSysCache(typeTup);
}
}
}
plan->plan = SPI_prepare(query, plan->nargs, plan->types);
if (plan->plan == NULL)
elog(ERROR, "SPI_prepare failed: %s",
SPI_result_code_string(SPI_result));
/* transfer plan from procCxt to topCxt */
tmpplan = plan->plan;
plan->plan = SPI_saveplan(tmpplan);
SPI_freeplan(tmpplan);
if (plan->plan == NULL)
elog(ERROR, "SPI_saveplan failed: %s",
SPI_result_code_string(SPI_result));
}
PG_CATCH();
{
MemoryContextSwitchTo(oldcontext);
PLy_error_in_progress = CopyErrorData();
FlushErrorState();
Py_DECREF(plan);
Py_XDECREF(optr);
if (!PyErr_Occurred())
PLy_exception_set(PLy_exc_spi_error,
"unrecognized error in PLy_spi_prepare");
/* XXX this oughta be replaced with errcontext mechanism */
PLy_elog(WARNING, "in PL/Python function \"%s\"",
PLy_procedure_name(PLy_curr_procedure));
return NULL;
}
PG_END_TRY();
return (PyObject *) plan;
}
/* execute(query="select * from foo", limit=5)
* execute(plan=plan, values=(foo, bar), limit=5)
*/
static PyObject *
PLy_spi_execute(PyObject * self, PyObject * args)
{
char *query;
PyObject *plan;
PyObject *list = NULL;
long limit = 0;
/* Can't execute more if we have an unhandled error */
if (PLy_error_in_progress)
{
PLy_exception_set(PLy_exc_error, "transaction aborted");
return NULL;
}
if (PyArg_ParseTuple(args, "s|l", &query, &limit))
return PLy_spi_execute_query(query, limit);
PyErr_Clear();
if (PyArg_ParseTuple(args, "O|Ol", &plan, &list, &limit) &&
is_PLyPlanObject(plan))
return PLy_spi_execute_plan(plan, list, limit);
PLy_exception_set(PLy_exc_error, "plpy.execute expected a query or a plan");
return NULL;
}
static PyObject *
PLy_spi_execute_plan(PyObject * ob, PyObject * list, long limit)
{
volatile int nargs;
int i,
rv;
PLyPlanObject *plan;
MemoryContext oldcontext;
if (list != NULL)
{
if (!PySequence_Check(list) || PyString_Check(list))
{
PLy_exception_set(PLy_exc_spi_error, "plpy.execute takes a sequence as its second argument");
return NULL;
}
nargs = PySequence_Length(list);
}
else
nargs = 0;
plan = (PLyPlanObject *) ob;
if (nargs != plan->nargs)
{
char *sv;
PyObject *so = PyObject_Str(list);
if (!so)
PLy_elog(ERROR, "PL/Python function \"%s\" could not execute plan",
PLy_procedure_name(PLy_curr_procedure));
sv = PyString_AsString(so);
PLy_exception_set(PLy_exc_spi_error,
dngettext(TEXTDOMAIN, "Expected sequence of %d argument, got %d: %s", "Expected sequence of %d arguments, got %d: %s", plan->nargs),
plan->nargs, nargs, sv);
Py_DECREF(so);
return NULL;
}
oldcontext = CurrentMemoryContext;
PG_TRY();
{
char *nulls = palloc(nargs * sizeof(char));
volatile int j;
for (j = 0; j < nargs; j++)
{
PyObject *elem,
*so;
elem = PySequence_GetItem(list, j);
if (elem != Py_None)
{
so = PyObject_Str(elem);
if (!so)
PLy_elog(ERROR, "PL/Python function \"%s\" could not execute plan",
PLy_procedure_name(PLy_curr_procedure));
Py_DECREF(elem);
PG_TRY();
{
char *sv = PyString_AsString(so);
plan->values[j] =
InputFunctionCall(&(plan->args[j].out.d.typfunc),
sv,
plan->args[j].out.d.typioparam,
-1);
}
PG_CATCH();
{
Py_DECREF(so);
PG_RE_THROW();
}
PG_END_TRY();
Py_DECREF(so);
nulls[j] = ' ';
}
else
{
Py_DECREF(elem);
plan->values[j] =
InputFunctionCall(&(plan->args[j].out.d.typfunc),
NULL,
plan->args[j].out.d.typioparam,
-1);
nulls[j] = 'n';
}
}
rv = SPI_execute_plan(plan->plan, plan->values, nulls,
PLy_curr_procedure->fn_readonly, limit);
pfree(nulls);
}
PG_CATCH();
{
int k;
MemoryContextSwitchTo(oldcontext);
PLy_error_in_progress = CopyErrorData();
FlushErrorState();
/*
* cleanup plan->values array
*/
for (k = 0; k < nargs; k++)
{
if (!plan->args[k].out.d.typbyval &&
(plan->values[k] != PointerGetDatum(NULL)))
{
pfree(DatumGetPointer(plan->values[k]));
plan->values[k] = PointerGetDatum(NULL);
}
}
if (!PyErr_Occurred())
PLy_exception_set(PLy_exc_error,
"unrecognized error in PLy_spi_execute_plan");
/* XXX this oughta be replaced with errcontext mechanism */
PLy_elog(WARNING, "in PL/Python function \"%s\"",
PLy_procedure_name(PLy_curr_procedure));
return NULL;
}
PG_END_TRY();
for (i = 0; i < nargs; i++)
{
if (!plan->args[i].out.d.typbyval &&
(plan->values[i] != PointerGetDatum(NULL)))
{
pfree(DatumGetPointer(plan->values[i]));
plan->values[i] = PointerGetDatum(NULL);
}
}
if (rv < 0)
{
PLy_exception_set(PLy_exc_spi_error,
"SPI_execute_plan failed: %s",
SPI_result_code_string(rv));
return NULL;
}
return PLy_spi_execute_fetch_result(SPI_tuptable, SPI_processed, rv);
}
static PyObject *
PLy_spi_execute_query(char *query, long limit)
{
int rv;
MemoryContext oldcontext;
oldcontext = CurrentMemoryContext;
PG_TRY();
{
rv = SPI_execute(query, PLy_curr_procedure->fn_readonly, limit);
}
PG_CATCH();
{
MemoryContextSwitchTo(oldcontext);
PLy_error_in_progress = CopyErrorData();
FlushErrorState();
if (!PyErr_Occurred())
PLy_exception_set(PLy_exc_spi_error,
"unrecognized error in PLy_spi_execute_query");
/* XXX this oughta be replaced with errcontext mechanism */
PLy_elog(WARNING, "in PL/Python function \"%s\"",
PLy_procedure_name(PLy_curr_procedure));
return NULL;
}
PG_END_TRY();
if (rv < 0)
{
PLy_exception_set(PLy_exc_spi_error,
"SPI_execute failed: %s",
SPI_result_code_string(rv));
return NULL;
}
return PLy_spi_execute_fetch_result(SPI_tuptable, SPI_processed, rv);
}
static PyObject *
PLy_spi_execute_fetch_result(SPITupleTable *tuptable, int rows, int status)
{
PLyResultObject *result;
MemoryContext oldcontext;
result = (PLyResultObject *) PLy_result_new();
Py_DECREF(result->status);
result->status = PyInt_FromLong(status);
if (status > 0 && tuptable == NULL)
{
Py_DECREF(result->nrows);
result->nrows = PyInt_FromLong(rows);
}
else if (status > 0 && tuptable != NULL)
{
PLyTypeInfo args;
int i;
Py_DECREF(result->nrows);
result->nrows = PyInt_FromLong(rows);
PLy_typeinfo_init(&args);
oldcontext = CurrentMemoryContext;
PG_TRY();
{
if (rows)
{
Py_DECREF(result->rows);
result->rows = PyList_New(rows);
PLy_input_tuple_funcs(&args, tuptable->tupdesc);
for (i = 0; i < rows; i++)
{
PyObject *row = PLyDict_FromTuple(&args, tuptable->vals[i],
tuptable->tupdesc);
PyList_SetItem(result->rows, i, row);
}
PLy_typeinfo_dealloc(&args);
SPI_freetuptable(tuptable);
}
}
PG_CATCH();
{
MemoryContextSwitchTo(oldcontext);
PLy_error_in_progress = CopyErrorData();
FlushErrorState();
if (!PyErr_Occurred())
PLy_exception_set(PLy_exc_error,
"unrecognized error in PLy_spi_execute_fetch_result");
Py_DECREF(result);
PLy_typeinfo_dealloc(&args);
return NULL;
}
PG_END_TRY();
}
return (PyObject *) result;
}
/*
* language handler and interpreter initialization
*/
/*
* _PG_init() - library load-time initialization
*
* DO NOT make this static nor change its name!
*/
void
_PG_init(void)
{
/* Be sure we do initialization only once (should be redundant now) */
static bool inited = false;
if (inited)
return;
pg_bindtextdomain(TEXTDOMAIN);
Py_Initialize();
PLy_init_interp();
PLy_init_plpy();
if (PyErr_Occurred())
PLy_elog(FATAL, "untrapped error in initialization");
PLy_procedure_cache = PyDict_New();
if (PLy_procedure_cache == NULL)
PLy_elog(ERROR, "could not create procedure cache");
inited = true;
}
static void
PLy_init_interp(void)
{
PyObject *mainmod;
mainmod = PyImport_AddModule("__main__");
if (mainmod == NULL || PyErr_Occurred())
PLy_elog(ERROR, "could not import \"__main__\" module");
Py_INCREF(mainmod);
PLy_interp_globals = PyModule_GetDict(mainmod);
PLy_interp_safe_globals = PyDict_New();
PyDict_SetItemString(PLy_interp_globals, "GD", PLy_interp_safe_globals);
Py_DECREF(mainmod);
if (PLy_interp_globals == NULL || PyErr_Occurred())
PLy_elog(ERROR, "could not initialize globals");
}
static void
PLy_init_plpy(void)
{
PyObject *main_mod,
*main_dict,
*plpy_mod;
PyObject *plpy,
*plpy_dict;
/*
* initialize plpy module
*/
if (PyType_Ready(&PLy_PlanType) < 0)
elog(ERROR, "could not initialize PLy_PlanType");
if (PyType_Ready(&PLy_ResultType) < 0)
elog(ERROR, "could not initialize PLy_ResultType");
plpy = Py_InitModule("plpy", PLy_methods);
plpy_dict = PyModule_GetDict(plpy);
/* PyDict_SetItemString(plpy, "PlanType", (PyObject *) &PLy_PlanType); */
PLy_exc_error = PyErr_NewException("plpy.Error", NULL, NULL);
PLy_exc_fatal = PyErr_NewException("plpy.Fatal", NULL, NULL);
PLy_exc_spi_error = PyErr_NewException("plpy.SPIError", NULL, NULL);
PyDict_SetItemString(plpy_dict, "Error", PLy_exc_error);
PyDict_SetItemString(plpy_dict, "Fatal", PLy_exc_fatal);
PyDict_SetItemString(plpy_dict, "SPIError", PLy_exc_spi_error);
/*
* initialize main module, and add plpy
*/
main_mod = PyImport_AddModule("__main__");
main_dict = PyModule_GetDict(main_mod);
plpy_mod = PyImport_AddModule("plpy");
PyDict_SetItemString(main_dict, "plpy", plpy_mod);
if (PyErr_Occurred())
elog(ERROR, "could not initialize plpy");
}
/* the python interface to the elog function
* don't confuse these with PLy_elog
*/
static PyObject *PLy_output(volatile int, PyObject *, PyObject *);
static PyObject *
PLy_debug(PyObject * self, PyObject * args)
{
return PLy_output(DEBUG2, self, args);
}
static PyObject *
PLy_log(PyObject * self, PyObject * args)
{
return PLy_output(LOG, self, args);
}
static PyObject *
PLy_info(PyObject * self, PyObject * args)
{
return PLy_output(INFO, self, args);
}
static PyObject *
PLy_notice(PyObject * self, PyObject * args)
{
return PLy_output(NOTICE, self, args);
}
static PyObject *
PLy_warning(PyObject * self, PyObject * args)
{
return PLy_output(WARNING, self, args);
}
static PyObject *
PLy_error(PyObject * self, PyObject * args)
{
return PLy_output(ERROR, self, args);
}
static PyObject *
PLy_fatal(PyObject * self, PyObject * args)
{
return PLy_output(FATAL, self, args);
}
static PyObject *
PLy_output(volatile int level, PyObject * self, PyObject * args)
{
PyObject *so;
char *volatile sv;
MemoryContext oldcontext;
so = PyObject_Str(args);
if (so == NULL || ((sv = PyString_AsString(so)) == NULL))
{
level = ERROR;
sv = dgettext(TEXTDOMAIN, "could not parse error message in plpy.elog");
}
oldcontext = CurrentMemoryContext;
PG_TRY();
{
elog(level, "%s", sv);
}
PG_CATCH();
{
MemoryContextSwitchTo(oldcontext);
PLy_error_in_progress = CopyErrorData();
FlushErrorState();
Py_XDECREF(so);
/*
* returning NULL here causes the python interpreter to bail. when
* control passes back to PLy_procedure_call, we check for PG
* exceptions and re-throw the error.
*/
PyErr_SetString(PLy_exc_error, sv);
return NULL;
}
PG_END_TRY();
Py_XDECREF(so);
/*
* return a legal object so the interpreter will continue on its merry way
*/
Py_INCREF(Py_None);
return Py_None;
}
/*
* Get the name of the last procedure called by the backend (the
* innermost, if a plpython procedure call calls the backend and the
* backend calls another plpython procedure).
*
* NB: this returns the SQL name, not the internal Python procedure name
*/
static char *
PLy_procedure_name(PLyProcedure * proc)
{
if (proc == NULL)
return "<unknown procedure>";
return proc->proname;
}
/* output a python traceback/exception via the postgresql elog
* function. not pretty.
*/
static void
PLy_exception_set(PyObject * exc, const char *fmt,...)
{
char buf[1024];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), dgettext(TEXTDOMAIN, fmt), ap);
va_end(ap);
PyErr_SetString(exc, buf);
}
/* Emit a PG error or notice, together with any available info about the
* current Python error. This should be used to propagate Python errors
* into PG.
*/
static void
PLy_elog(int elevel, const char *fmt,...)
{
char *xmsg;
int xlevel;
StringInfoData emsg;
xmsg = PLy_traceback(&xlevel);
initStringInfo(&emsg);
for (;;)
{
va_list ap;
bool success;
va_start(ap, fmt);
success = appendStringInfoVA(&emsg, dgettext(TEXTDOMAIN, fmt), ap);
va_end(ap);
if (success)
break;
enlargeStringInfo(&emsg, emsg.maxlen);
}
PG_TRY();
{
ereport(elevel,
(errmsg("PL/Python: %s", emsg.data),
(xmsg) ? errdetail("%s", xmsg) : 0));
}
PG_CATCH();
{
pfree(emsg.data);
if (xmsg)
pfree(xmsg);
PG_RE_THROW();
}
PG_END_TRY();
pfree(emsg.data);
if (xmsg)
pfree(xmsg);
}
static char *
PLy_traceback(int *xlevel)
{
PyObject *e,
*v,
*tb;
PyObject *eob,
*vob = NULL;
char *vstr,
*estr;
StringInfoData xstr;
/*
* get the current exception
*/
PyErr_Fetch(&e, &v, &tb);
/*
* oops, no exception, return
*/
if (e == NULL)
{
*xlevel = WARNING;
return NULL;
}
PyErr_NormalizeException(&e, &v, &tb);
Py_XDECREF(tb);
eob = PyObject_Str(e);
if (v && ((vob = PyObject_Str(v)) != NULL))
vstr = PyString_AsString(vob);
else
vstr = "unknown";
/*
* I'm not sure what to do if eob is NULL here -- we can't call PLy_elog
* because that function calls us, so we could end up with infinite
* recursion. I'm not even sure if eob could be NULL here -- would an
* Assert() be more appropriate?
*/
estr = eob ? PyString_AsString(eob) : "unrecognized exception";
initStringInfo(&xstr);
appendStringInfo(&xstr, "%s: %s", estr, vstr);
Py_DECREF(eob);
Py_XDECREF(vob);
Py_XDECREF(v);
/*
* intuit an appropriate error level based on the exception type
*/
if (PLy_exc_error && PyErr_GivenExceptionMatches(e, PLy_exc_error))
*xlevel = ERROR;
else if (PLy_exc_fatal && PyErr_GivenExceptionMatches(e, PLy_exc_fatal))
*xlevel = FATAL;
else
*xlevel = ERROR;
Py_DECREF(e);
return xstr.data;
}
/* python module code */
/* some dumb utility functions */
static void *
PLy_malloc(size_t bytes)
{
void *ptr = malloc(bytes);
if (ptr == NULL)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return ptr;
}
static void *
PLy_malloc0(size_t bytes)
{
void *ptr = PLy_malloc(bytes);
MemSet(ptr, 0, bytes);
return ptr;
}
static char *
PLy_strdup(const char *str)
{
char *result;
size_t len;
len = strlen(str) + 1;
result = PLy_malloc(len);
memcpy(result, str, len);
return result;
}
/* define this away */
static void
PLy_free(void *ptr)
{
free(ptr);
}
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