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postgres/src/pl/plpython/plpython.c
Tom Lane e627dd2db9 Fix pltcl and plpython to support STATEMENT triggers. 
Joe Conway
2003-08-04 18:40:50 +00:00

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/**********************************************************************
* plpython.c - python as a procedural language for PostgreSQL
*
* This software is copyright by Andrew Bosma
* but is really shameless cribbed from pltcl.c by Jan Weick, and
* plperl.c by Mark Hollomon.
*
* The author hereby grants permission to use, copy, modify,
* distribute, and license this software and its documentation for any
* purpose, provided that existing copyright notices are retained in
* all copies and that this notice is included verbatim in any
* distributions. No written agreement, license, or royalty fee is
* required for any of the authorized uses. Modifications to this
* software may be copyrighted by their author and need not follow the
* licensing terms described here, provided that the new terms are
* clearly indicated on the first page of each file where they apply.
*
* IN NO EVENT SHALL THE AUTHOR OR DISTRIBUTORS BE LIABLE TO ANY PARTY
* FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
* DERIVATIVES THEREOF, EVEN IF THE AUTHOR HAVE BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* THE AUTHOR AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
* NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
* AND THE AUTHOR AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/pl/plpython/plpython.c,v 1.39 2003/08/04 18:40:50 tgl Exp $
*
*********************************************************************
*/
#include "postgres.h"
/* system stuff
*/
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <setjmp.h>
/* postgreSQL stuff
*/
#include "access/heapam.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "commands/trigger.h"
#include "executor/spi.h"
#include "fmgr.h"
#include "nodes/makefuncs.h"
#include "parser/parse_type.h"
#include "tcop/tcopprot.h"
#include "utils/syscache.h"
#include <Python.h>
#include <compile.h>
#include <eval.h>
#include "plpython.h"
/* 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;
Oid typelem;
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;
Oid typelem;
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_rel;
} PLyTypeInfo;
/* cached procedure data
*/
typedef struct PLyProcedure
{
char *proname; /* SQL name of procedure */
char *pyname; /* Python name of procedure */
TransactionId fn_xmin;
CommandId fn_cmin;
PLyTypeInfo result; /* also used to store info for trigger
* tuple type */
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 score */
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 allows
* preinitialization of the interpreter during postmaster startup.
*/
Datum plpython_call_handler(PG_FUNCTION_ARGS);
void plpython_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_all(void);
static void PLy_init_interp(void);
static void PLy_init_plpy(void);
/* error handler. collects the current Python exception, if any,
* and appends it to the error and sends it to elog
*/
static void PLy_elog(int, const char *,...);
/* call PyErr_SetString with a vprint interface
*/
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_malloc(size_t);
static void *PLy_realloc(void *, size_t);
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 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 *);
/* returns a cached PLyProcedure, or creates, stores and returns
* a new PLyProcedure.
*/
static PLyProcedure *PLy_procedure_get(FunctionCallInfo fcinfo, bool);
static PLyProcedure *PLy_procedure_create(FunctionCallInfo fcinfo,
bool is_trigger,
HeapTuple procTup, 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 *, Form_pg_type);
static void PLy_output_datum_func2(PLyObToDatum *, Form_pg_type);
static void PLy_input_datum_func(PLyTypeInfo *, Oid, Form_pg_type);
static void PLy_input_datum_func2(PLyDatumToOb *, Oid, Form_pg_type);
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 *);
/* global data
*/
static int PLy_first_call = 1;
static volatile int PLy_call_level = 0;
/*
* Last function called by postgres backend
*/
static PLyProcedure *PLy_last_procedure = NULL;
/* this gets modified in plpython_call_handler and PLy_elog.
* test it any old where, but do NOT modify it anywhere except
* those two functions
*/
static volatile int PLy_restart_in_progress = 0;
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"
};
#if DEBUG_EXC
volatile int exc_save_calls = 0;
volatile int exc_restore_calls = 0;
volatile int func_enter_calls = 0;
volatile int func_leave_calls = 0;
#endif
/*
* 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)
{
DECLARE_EXC();
Datum retval;
volatile bool is_trigger;
PLyProcedure *volatile proc = NULL;
enter();
PLy_init_all();
if (SPI_connect() != SPI_OK_CONNECT)
elog(ERROR, "could not connect to SPI manager");
CALL_LEVEL_INC();
is_trigger = CALLED_AS_TRIGGER(fcinfo);
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
CALL_LEVEL_DEC();
if (PLy_call_level == 0)
{
PLy_restart_in_progress = 0;
PyErr_Clear();
}
else
PLy_restart_in_progress += 1;
if (proc)
{
/* note: Py_DECREF needs braces around it, as of 2003/08 */
Py_DECREF(proc->me);
}
RERAISE_EXC();
}
/*
* elog(DEBUG3, "PLy_restart_in_progress is %d",
* PLy_restart_in_progress);
*/
proc = PLy_procedure_get(fcinfo, is_trigger);
if (is_trigger)
{
HeapTuple trv = PLy_trigger_handler(fcinfo, proc);
retval = PointerGetDatum(trv);
}
else
retval = PLy_function_handler(fcinfo, proc);
CALL_LEVEL_DEC();
RESTORE_EXC();
Py_DECREF(proc->me);
refc(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.
*/
HeapTuple
PLy_trigger_handler(FunctionCallInfo fcinfo, PLyProcedure * proc)
{
DECLARE_EXC();
HeapTuple rv = NULL;
PyObject *volatile plargs = NULL;
PyObject *volatile plrv = NULL;
enter();
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
Py_XDECREF(plargs);
Py_XDECREF(plrv);
RERAISE_EXC();
}
plargs = PLy_trigger_build_args(fcinfo, proc, &rv);
plrv = PLy_procedure_call(proc, "TD", plargs);
/*
* Disconnect from SPI manager
*/
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "SPI_finish failed");
if (plrv == NULL)
elog(FATAL, "PLy_procedure_call returned NULL");
if (PLy_restart_in_progress)
elog(FATAL, "restart in progress not expected");
/*
* return of None means we're happy with the tuple
*/
if (plrv != Py_None)
{
char *srv;
if (!PyString_Check(plrv))
elog(ERROR, "expected trigger to return None or a String");
srv = PyString_AsString(plrv);
if (strcasecmp(srv, "SKIP") == 0)
rv = NULL;
else if (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
elog(WARNING, "ignoring modified tuple in DELETE trigger");
}
else if (strcasecmp(srv, "OK"))
{
/*
* hmmm, perhaps they only read the pltcl page, not a
* surprising thing since i've written no documentation, so
* accept a belated OK
*/
elog(ERROR, "expected return to be \"SKIP\" or \"MODIFY\"");
}
}
Py_DECREF(plargs);
Py_DECREF(plrv);
RESTORE_EXC();
return rv;
}
HeapTuple
PLy_modify_tuple(PLyProcedure * proc, PyObject * pltd, TriggerData *tdata,
HeapTuple otup)
{
DECLARE_EXC();
PyObject *volatile plntup;
PyObject *volatile plkeys;
PyObject *volatile platt;
PyObject *volatile plval;
PyObject *volatile plstr;
HeapTuple rtup;
int natts,
i,
j,
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;
enter();
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
Py_XDECREF(plntup);
Py_XDECREF(plkeys);
Py_XDECREF(platt);
Py_XDECREF(plval);
Py_XDECREF(plstr);
if (modnulls)
pfree(modnulls);
if (modvalues)
pfree(modvalues);
if (modattrs)
pfree(modattrs);
RERAISE_EXC();
}
if ((plntup = PyDict_GetItemString(pltd, "new")) == NULL)
elog(ERROR, "TD[\"new\"] deleted, unable to modify tuple");
if (!PyDict_Check(plntup))
elog(ERROR, "TD[\"new\"] is not a dictionary object");
Py_INCREF(plntup);
plkeys = PyDict_Keys(plntup);
natts = PyList_Size(plkeys);
if (natts != proc->result.out.r.natts)
elog(ERROR, "TD[\"new\"] has an incorrect number of keys");
modattrs = palloc(natts * sizeof(int));
modvalues = palloc(natts * sizeof(Datum));
for (i = 0; i < natts; i++)
{
modattrs[i] = i + 1;
modvalues[i] = (Datum) NULL;
}
modnulls = palloc(natts + 1);
memset(modnulls, 'n', natts);
modnulls[natts] = '\0';
tupdesc = tdata->tg_relation->rd_att;
for (j = 0; j < natts; j++)
{
char *src;
platt = PyList_GetItem(plkeys, j);
if (!PyString_Check(platt))
elog(ERROR, "attribute is not a string");
attn = modattrs[j] = SPI_fnumber(tupdesc, PyString_AsString(platt));
if (attn == SPI_ERROR_NOATTRIBUTE)
elog(ERROR, "invalid attribute \"%s\" in tuple",
PyString_AsString(platt));
atti = attn - 1;
plval = PyDict_GetItem(plntup, platt);
if (plval == NULL)
elog(FATAL, "python interpreter is probably corrupted");
Py_INCREF(plval);
if (plval != Py_None)
{
plstr = PyObject_Str(plval);
src = PyString_AsString(plstr);
modvalues[j] = FunctionCall3(&proc->result.out.r.atts[atti].typfunc,
CStringGetDatum(src),
ObjectIdGetDatum(proc->result.out.r.atts[atti].typelem),
Int32GetDatum(tupdesc->attrs[atti]->atttypmod));
modnulls[j] = ' ';
Py_DECREF(plstr);
plstr = NULL;
}
Py_DECREF(plval);
plval = NULL;
}
rtup = SPI_modifytuple(tdata->tg_relation, otup, natts, modattrs,
modvalues, modnulls);
/*
* FIXME -- these leak if not explicitly pfree'd by other elog calls,
* no?
*/
pfree(modattrs);
pfree(modvalues);
pfree(modnulls);
if (rtup == NULL)
elog(ERROR, "SPI_modifytuple failed -- error %d", SPI_result);
Py_DECREF(plntup);
Py_DECREF(plkeys);
RESTORE_EXC();
return rtup;
}
PyObject *
PLy_trigger_build_args(FunctionCallInfo fcinfo, PLyProcedure * proc, HeapTuple *rv)
{
DECLARE_EXC();
TriggerData *tdata;
PyObject *pltname,
*pltevent,
*pltwhen,
*pltlevel,
*pltrelid;
PyObject *pltargs,
*pytnew,
*pytold;
PyObject *volatile pltdata = NULL;
char *stroid;
enter();
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
Py_XDECREF(pltdata);
RERAISE_EXC();
}
tdata = (TriggerData *) fcinfo->context;
pltdata = PyDict_New();
if (!pltdata)
PLy_elog(ERROR, "could not build arguments for trigger procedure");
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);
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 = (HeapTuple) 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
{
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);
RESTORE_EXC();
return pltdata;
}
/* function handler and friends
*/
Datum
PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure * proc)
{
DECLARE_EXC();
Datum rv;
PyObject *volatile plargs = NULL;
PyObject *volatile plrv = NULL;
PyObject *volatile plrv_so = NULL;
char *plrv_sc;
enter();
/*
* setup to catch elog in while building function arguments, and
* DECREF the plargs if the function call fails
*/
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
Py_XDECREF(plargs);
Py_XDECREF(plrv);
Py_XDECREF(plrv_so);
RERAISE_EXC();
}
plargs = PLy_function_build_args(fcinfo, proc);
plrv = PLy_procedure_call(proc, "args", plargs);
/*
* 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 (plrv == NULL)
{
elog(FATAL, "PLy_procedure_call returned NULL");
#ifdef NOT_USED
if (!PLy_restart_in_progress)
PLy_elog(ERROR, "function \"%s\" failed", proc->proname);
/*
* FIXME is this dead code? i'm pretty sure it is for unnested
* calls, but not for nested calls
*/
RAISE_EXC(1);
#endif
}
/*
* convert the python PyObject to a postgresql Datum FIXME returning a
* NULL, ie PG_RETURN_NULL() blows the backend to small messy bits...
* it this a bug or expected? so just call with the string value of
* None for now
*/
if (plrv == Py_None)
{
fcinfo->isnull = true;
rv = (Datum) NULL;
}
else
{
fcinfo->isnull = false;
plrv_so = PyObject_Str(plrv);
plrv_sc = PyString_AsString(plrv_so);
rv = FunctionCall3(&proc->result.out.d.typfunc,
PointerGetDatum(plrv_sc),
ObjectIdGetDatum(proc->result.out.d.typelem),
Int32GetDatum(-1));
}
RESTORE_EXC();
Py_XDECREF(plargs);
Py_DECREF(plrv);
Py_XDECREF(plrv_so);
return rv;
}
PyObject *
PLy_procedure_call(PLyProcedure * proc, char *kargs, PyObject * vargs)
{
PyObject *rv;
PLyProcedure *current;
enter();
current = PLy_last_procedure;
PLy_last_procedure = proc;
PyDict_SetItemString(proc->globals, kargs, vargs);
rv = PyEval_EvalCode((PyCodeObject *) proc->code, proc->globals, proc->globals);
PLy_last_procedure = current;
if ((rv == NULL) || (PyErr_Occurred()))
{
Py_XDECREF(rv);
if (!PLy_restart_in_progress)
PLy_elog(ERROR, "function \"%s\" failed", proc->proname);
RAISE_EXC(1);
}
return rv;
}
PyObject *
PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure * proc)
{
DECLARE_EXC();
PyObject *volatile arg = NULL;
PyObject *volatile args = NULL;
int i;
enter();
/*
* FIXME -- if the setjmp setup is expensive, add the arg and args
* field to the procedure struct and cleanup at the start of the next
* call
*/
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
Py_XDECREF(arg);
Py_XDECREF(args);
RERAISE_EXC();
}
args = PyList_New(proc->nargs);
for (i = 0; i < proc->nargs; i++)
{
if (proc->args[i].is_rel == 1)
{
TupleTableSlot *slot = (TupleTableSlot *) fcinfo->arg[i];
arg = PLyDict_FromTuple(&(proc->args[i]), slot->val,
slot->ttc_tupleDescriptor);
}
else
{
if (!fcinfo->argnull[i])
{
char *ct;
Datum dt;
dt = FunctionCall3(&(proc->args[i].in.d.typfunc),
fcinfo->arg[i],
ObjectIdGetDatum(proc->args[i].in.d.typelem),
Int32GetDatum(-1));
ct = DatumGetCString(dt);
arg = (proc->args[i].in.d.func) (ct);
pfree(ct);
}
else
arg = NULL;
}
if (arg == NULL)
{
Py_INCREF(Py_None);
arg = Py_None;
}
/*
* FIXME -- error check this
*/
PyList_SetItem(args, i, arg);
}
RESTORE_EXC();
return args;
}
/* PLyProcedure functions
*/
static PLyProcedure *
PLy_procedure_get(FunctionCallInfo fcinfo, bool is_trigger)
{
Oid fn_oid;
HeapTuple procTup;
char key[128];
PyObject *plproc;
PLyProcedure *proc = NULL;
int rv;
enter();
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%s",
fn_oid,
is_trigger ? "_trigger" : "");
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");
mark();
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) ||
proc->fn_cmin != HeapTupleHeaderGetCmin(procTup->t_data))
{
Py_DECREF(plproc);
proc = NULL;
}
}
if (proc == NULL)
proc = PLy_procedure_create(fcinfo, is_trigger, procTup, key);
ReleaseSysCache(procTup);
return proc;
}
static PLyProcedure *
PLy_procedure_create(FunctionCallInfo fcinfo, bool is_trigger,
HeapTuple procTup, char *key)
{
char procName[NAMEDATALEN + 256];
DECLARE_EXC();
Form_pg_proc procStruct;
PLyProcedure *volatile proc;
char *volatile procSource = NULL;
Datum procDatum;
int i,
rv;
enter();
procStruct = (Form_pg_proc) GETSTRUCT(procTup);
rv = snprintf(procName, sizeof(procName),
"__plpython_procedure_%s_%u%s",
NameStr(procStruct->proname),
fcinfo->flinfo->fn_oid,
is_trigger ? "_trigger" : "");
if ((rv >= sizeof(procName)) || (rv < 0))
elog(ERROR, "procedure name would overrun buffer");
proc = PLy_malloc(sizeof(PLyProcedure));
proc->proname = PLy_malloc(strlen(NameStr(procStruct->proname)) + 1);
strcpy(proc->proname, NameStr(procStruct->proname));
proc->pyname = PLy_malloc(strlen(procName) + 1);
strcpy(proc->pyname, procName);
proc->fn_xmin = HeapTupleHeaderGetXmin(procTup->t_data);
proc->fn_cmin = HeapTupleHeaderGetCmin(procTup->t_data);
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;
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
PLy_procedure_delete(proc);
if (procSource)
pfree(procSource);
RERAISE_EXC();
}
/*
* get information required for output conversion of the return value,
* but only if this isn't a trigger.
*/
if (!is_trigger)
{
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);
if (rvTypeStruct->typrelid == InvalidOid)
PLy_output_datum_func(&proc->result, rvTypeStruct);
else
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("tuple return types are not supported yet")));
ReleaseSysCache(rvTypeTup);
}
else
{
/*
* input/output conversion for trigger tuples. use the result
* TypeInfo variable to store the tuple conversion info.
*/
TriggerData *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);
}
/*
* now get information required for input conversion of the procedures
* arguments.
*/
proc->nargs = fcinfo->nargs;
for (i = 0; i < fcinfo->nargs; i++)
{
HeapTuple argTypeTup;
Form_pg_type argTypeStruct;
argTypeTup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(procStruct->proargtypes[i]),
0, 0, 0);
if (!HeapTupleIsValid(argTypeTup))
elog(ERROR, "cache lookup failed for type %u",
procStruct->proargtypes[i]);
argTypeStruct = (Form_pg_type) GETSTRUCT(argTypeTup);
if (argTypeStruct->typrelid == InvalidOid)
PLy_input_datum_func(&(proc->args[i]),
procStruct->proargtypes[i],
argTypeStruct);
else
{
TupleTableSlot *slot = (TupleTableSlot *) fcinfo->arg[i];
PLy_input_tuple_funcs(&(proc->args[i]),
slot->ttc_tupleDescriptor);
}
ReleaseSysCache(argTypeTup);
}
/*
* get the text of the function.
*/
procDatum = DirectFunctionCall1(textout,
PointerGetDatum(&procStruct->prosrc));
procSource = DatumGetCString(procDatum);
PLy_procedure_compile(proc, procSource);
pfree(procSource);
proc->me = PyCObject_FromVoidPtr(proc, NULL);
PyDict_SetItemString(PLy_procedure_cache, key, proc->me);
RESTORE_EXC();
return proc;
}
void
PLy_procedure_compile(PLyProcedure * proc, const char *src)
{
PyObject *crv = NULL;
char *msrc;
enter();
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 function \"%s\"", proc->proname);
}
char *
PLy_procedure_munge_source(const char *name, const char *src)
{
char *mrc,
*mp;
const char *sp;
size_t mlen,
plen;
enter();
/*
* 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 == '\n')
{
*mp++ = *sp++;
*mp++ = '\t';
}
else
*mp++ = *sp++;
}
*mp++ = '\n';
*mp++ = '\n';
*mp = '\0';
if (mp > (mrc + mlen))
elog(FATAL, "buffer overrun in PLy_munge_source");
return mrc;
}
void
PLy_procedure_delete(PLyProcedure * proc)
{
int i;
enter();
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_rel == 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);
}
leave();
}
/* conversion functions. remember output from python is
* input to postgresql, and vis versa.
*/
void
PLy_input_tuple_funcs(PLyTypeInfo * arg, TupleDesc desc)
{
int i;
enter();
if (arg->is_rel == 0)
elog(ERROR, "PLyTypeInfo struct is initialized for a Datum");
arg->is_rel = 1;
arg->in.r.natts = desc->natts;
arg->in.r.atts = malloc(desc->natts * sizeof(PLyDatumToOb));
for (i = 0; i < desc->natts; i++)
{
HeapTuple typeTup;
Form_pg_type typeStruct;
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);
typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
PLy_input_datum_func2(&(arg->in.r.atts[i]),
desc->attrs[i]->atttypid,
typeStruct);
ReleaseSysCache(typeTup);
}
}
void
PLy_output_tuple_funcs(PLyTypeInfo * arg, TupleDesc desc)
{
int i;
enter();
if (arg->is_rel == 0)
elog(ERROR, "PLyTypeInfo struct is initialized for a Datum");
arg->is_rel = 1;
arg->out.r.natts = desc->natts;
arg->out.r.atts = malloc(desc->natts * sizeof(PLyDatumToOb));
for (i = 0; i < desc->natts; i++)
{
HeapTuple typeTup;
Form_pg_type typeStruct;
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);
typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
PLy_output_datum_func2(&(arg->out.r.atts[i]), typeStruct);
ReleaseSysCache(typeTup);
}
}
void
PLy_output_datum_func(PLyTypeInfo * arg, Form_pg_type typeStruct)
{
enter();
if (arg->is_rel == 1)
elog(ERROR, "PLyTypeInfo struct is initialized for a Tuple");
arg->is_rel = 0;
PLy_output_datum_func2(&(arg->out.d), typeStruct);
}
void
PLy_output_datum_func2(PLyObToDatum * arg, Form_pg_type typeStruct)
{
enter();
perm_fmgr_info(typeStruct->typinput, &arg->typfunc);
arg->typelem = typeStruct->typelem;
arg->typbyval = typeStruct->typbyval;
}
void
PLy_input_datum_func(PLyTypeInfo * arg, Oid typeOid, Form_pg_type typeStruct)
{
enter();
if (arg->is_rel == 1)
elog(ERROR, "PLyTypeInfo struct is initialized for Tuple");
arg->is_rel = 0;
PLy_input_datum_func2(&(arg->in.d), typeOid, typeStruct);
}
void
PLy_input_datum_func2(PLyDatumToOb * arg, Oid typeOid, Form_pg_type typeStruct)
{
/* Get the type's conversion information */
perm_fmgr_info(typeStruct->typoutput, &arg->typfunc);
arg->typelem = typeStruct->typelem;
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;
}
}
void
PLy_typeinfo_init(PLyTypeInfo * arg)
{
arg->is_rel = -1;
arg->in.r.natts = arg->out.r.natts = 0;
arg->in.r.atts = NULL;
arg->out.r.atts = NULL;
}
void
PLy_typeinfo_dealloc(PLyTypeInfo * arg)
{
if (arg->is_rel == 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'
*/
PyObject *
PLyBool_FromString(const char *src)
{
enter();
if (src[0] == 't')
return PyInt_FromLong(1);
return PyInt_FromLong(0);
}
PyObject *
PLyFloat_FromString(const char *src)
{
double v;
char *eptr;
enter();
errno = 0;
v = strtod(src, &eptr);
if ((*eptr != '\0') || (errno))
return NULL;
return PyFloat_FromDouble(v);
}
PyObject *
PLyInt_FromString(const char *src)
{
long v;
char *eptr;
enter();
errno = 0;
v = strtol(src, &eptr, 0);
if ((*eptr != '\0') || (errno))
return NULL;
return PyInt_FromLong(v);
}
PyObject *
PLyLong_FromString(const char *src)
{
return PyLong_FromString((char *) src, NULL, 0);
}
PyObject *
PLyString_FromString(const char *src)
{
return PyString_FromString(src);
}
PyObject *
PLyDict_FromTuple(PLyTypeInfo * info, HeapTuple tuple, TupleDesc desc)
{
DECLARE_EXC();
PyObject *volatile dict;
int i;
enter();
if (info->is_rel != 1)
elog(ERROR, "PLyTypeInfo structure describes a datum");
dict = PyDict_New();
if (dict == NULL)
PLy_elog(ERROR, "could not create tuple dictionary");
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
Py_DECREF(dict);
RERAISE_EXC();
}
for (i = 0; i < info->in.r.natts; i++)
{
char *key,
*vsrc;
Datum vattr,
vdat;
bool is_null;
PyObject *value;
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
{
vdat = FunctionCall3(&info->in.r.atts[i].typfunc,
vattr,
ObjectIdGetDatum(info->in.r.atts[i].typelem),
Int32GetDatum(desc->attrs[i]->atttypmod));
vsrc = DatumGetCString(vdat);
/*
* no exceptions allowed
*/
value = info->in.r.atts[i].func(vsrc);
pfree(vsrc);
PyDict_SetItemString(dict, key, value);
Py_DECREF(value);
}
}
RESTORE_EXC();
return dict;
}
/* 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 *);
#ifdef NOT_USED
/* Appear to be unused */
static PyObject *PLy_result_fetch(PyObject *, PyObject *);
static PyObject *PLy_result_nrows(PyObject *, PyObject *);
static PyObject *PLy_result_status(PyObject *, PyObject *);
#endif
static int PLy_result_length(PyObject *);
static PyObject *PLy_result_item(PyObject *, int);
static PyObject *PLy_result_slice(PyObject *, int, int);
static int PLy_result_ass_item(PyObject *, int, PyObject *);
static int PLy_result_ass_slice(PyObject *, int, int, PyObject *);
static PyObject *PLy_spi_prepare(PyObject *, PyObject *);
static PyObject *PLy_spi_execute(PyObject *, PyObject *);
static const char *PLy_spi_error_string(int);
static PyObject *PLy_spi_execute_query(char *query, int limit);
static PyObject *PLy_spi_execute_plan(PyObject *, PyObject *, int);
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
*/
(destructor) PLy_plan_dealloc, /* tp_dealloc */
0, /* tp_print */
(getattrfunc) 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 */
0, /* tp_xxx4 */
PLy_plan_doc, /* tp_doc */
};
static PyMethodDef PLy_plan_methods[] = {
{"status", (PyCFunction) PLy_plan_status, METH_VARARGS, NULL},
{NULL, NULL, 0, NULL}
};
static PySequenceMethods PLy_result_as_sequence = {
(inquiry) PLy_result_length, /* sq_length */
(binaryfunc) 0, /* sq_concat */
(intargfunc) 0, /* sq_repeat */
(intargfunc) PLy_result_item, /* sq_item */
(intintargfunc) PLy_result_slice, /* sq_slice */
(intobjargproc) PLy_result_ass_item, /* sq_ass_item */
(intintobjargproc) 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
*/
(destructor) PLy_result_dealloc, /* tp_dealloc */
0, /* tp_print */
(getattrfunc) 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 */
0, /* tp_xxx4 */
PLy_result_doc, /* tp_doc */
};
#ifdef NOT_USED
/* Appear to be unused */
static PyMethodDef PLy_result_methods[] = {
{"fetch", (PyCFunction) PLy_result_fetch, METH_VARARGS, NULL,},
{"nrows", (PyCFunction) PLy_result_nrows, METH_VARARGS, NULL},
{"status", (PyCFunction) PLy_result_status, METH_VARARGS, NULL},
{NULL, NULL, 0, NULL}
};
#endif
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
*/
PyObject *
PLy_plan_new(void)
{
PLyPlanObject *ob;
enter();
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;
}
void
PLy_plan_dealloc(PyObject * arg)
{
PLyPlanObject *ob = (PLyPlanObject *) arg;
enter();
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);
}
PyMem_DEL(arg);
leave();
}
PyObject *
PLy_plan_getattr(PyObject * self, char *name)
{
return Py_FindMethod(PLy_plan_methods, self, name);
}
PyObject *
PLy_plan_status(PyObject * self, PyObject * args)
{
if (PyArg_ParseTuple(args, ""))
{
Py_INCREF(Py_True);
return Py_True;
/* return PyInt_FromLong(self->status); */
}
PyErr_SetString(PLy_exc_error, "plan.status() takes no arguments");
return NULL;
}
/* result object methods
*/
PyObject *
PLy_result_new(void)
{
PLyResultObject *ob;
enter();
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;
}
void
PLy_result_dealloc(PyObject * arg)
{
PLyResultObject *ob = (PLyResultObject *) arg;
enter();
Py_XDECREF(ob->nrows);
Py_XDECREF(ob->rows);
Py_XDECREF(ob->status);
PyMem_DEL(ob);
}
PyObject *
PLy_result_getattr(PyObject * self, char *attr)
{
return NULL;
}
#ifdef NOT_USED
/* Appear to be unused */
PyObject *
PLy_result_fetch(PyObject * self, PyObject * args)
{
return NULL;
}
PyObject *
PLy_result_nrows(PyObject * self, PyObject * args)
{
PLyResultObject *ob = (PLyResultObject *) self;
Py_INCREF(ob->nrows);
return ob->nrows;
}
PyObject *
PLy_result_status(PyObject * self, PyObject * args)
{
PLyResultObject *ob = (PLyResultObject *) self;
Py_INCREF(ob->status);
return ob->status;
}
#endif
int
PLy_result_length(PyObject * arg)
{
PLyResultObject *ob = (PLyResultObject *) arg;
return PyList_Size(ob->rows);
}
PyObject *
PLy_result_item(PyObject * arg, int idx)
{
PyObject *rv;
PLyResultObject *ob = (PLyResultObject *) arg;
rv = PyList_GetItem(ob->rows, idx);
if (rv != NULL)
Py_INCREF(rv);
return rv;
}
int
PLy_result_ass_item(PyObject * arg, int idx, PyObject * item)
{
int rv;
PLyResultObject *ob = (PLyResultObject *) arg;
Py_INCREF(item);
rv = PyList_SetItem(ob->rows, idx, item);
return rv;
}
PyObject *
PLy_result_slice(PyObject * arg, int lidx, int hidx)
{
PyObject *rv;
PLyResultObject *ob = (PLyResultObject *) arg;
rv = PyList_GetSlice(ob->rows, lidx, hidx);
if (rv == NULL)
return NULL;
Py_INCREF(rv);
return rv;
}
int
PLy_result_ass_slice(PyObject * arg, int lidx, int hidx, PyObject * slice)
{
int rv;
PLyResultObject *ob = (PLyResultObject *) arg;
rv = PyList_SetSlice(ob->rows, lidx, hidx, slice);
return rv;
}
/* SPI interface
*/
PyObject *
PLy_spi_prepare(PyObject * self, PyObject * args)
{
DECLARE_EXC();
PLyPlanObject *plan;
PyObject *list = NULL;
PyObject *volatile optr = NULL;
char *query;
void *tmpplan;
enter();
if (!PyArg_ParseTuple(args, "s|O", &query, &list))
{
PyErr_SetString(PLy_exc_spi_error,
"Invalid arguments for plpy.prepare()");
return NULL;
}
if ((list) && (!PySequence_Check(list)))
{
PyErr_SetString(PLy_exc_spi_error,
"Second argument in plpy.prepare() must be a sequence");
return NULL;
}
if ((plan = (PLyPlanObject *) PLy_plan_new()) == NULL)
return NULL;
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
Py_DECREF(plan);
Py_XDECREF(optr);
if (!PyErr_Occurred())
PyErr_SetString(PLy_exc_spi_error,
"Unknown error in PLy_spi_prepare");
/* XXX this oughta be replaced with errcontext mechanism */
PLy_elog(WARNING, "in function %s:", PLy_procedure_name(PLy_last_procedure));
RERAISE_EXC();
}
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] = (Datum) NULL;
}
for (i = 0; i < nargs; i++)
{
char *sptr;
HeapTuple typeTup;
Form_pg_type typeStruct;
optr = PySequence_GetItem(list, i);
if (!PyString_Check(optr))
{
PyErr_SetString(PLy_exc_spi_error,
"Type names must be strings.");
RAISE_EXC(1);
}
sptr = PyString_AsString(optr);
/* XXX should extend this to allow qualified type names */
typeTup = typenameType(makeTypeName(sptr));
Py_DECREF(optr);
optr = NULL; /* this is important */
plan->types[i] = HeapTupleGetOid(typeTup);
typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
if (typeStruct->typrelid == InvalidOid)
PLy_output_datum_func(&plan->args[i], typeStruct);
else
{
PyErr_SetString(PLy_exc_spi_error,
"tuples not handled in plpy.prepare, yet.");
RAISE_EXC(1);
}
ReleaseSysCache(typeTup);
}
}
}
plan->plan = SPI_prepare(query, plan->nargs, plan->types);
if (plan->plan == NULL)
{
PLy_exception_set(PLy_exc_spi_error,
"Unable to prepare plan. SPI_prepare failed -- %s.",
PLy_spi_error_string(SPI_result));
RAISE_EXC(1);
}
/* transfer plan from procCxt to topCxt */
tmpplan = plan->plan;
plan->plan = SPI_saveplan(tmpplan);
SPI_freeplan(tmpplan);
if (plan->plan == NULL)
{
PLy_exception_set(PLy_exc_spi_error,
"Unable to save plan. SPI_saveplan failed -- %s.",
PLy_spi_error_string(SPI_result));
RAISE_EXC(1);
}
RESTORE_EXC();
return (PyObject *) plan;
}
/* execute(query="select * from foo", limit=5)
* execute(plan=plan, values=(foo, bar), limit=5)
*/
PyObject *
PLy_spi_execute(PyObject * self, PyObject * args)
{
char *query;
PyObject *plan;
PyObject *list = NULL;
int limit = 0;
enter();
#ifdef NOT_USED
/*
* there should - hahaha - be an python exception set so just return
* NULL. FIXME -- is this needed?
*/
if (PLy_restart_in_progress)
return NULL;
#endif
if (PyArg_ParseTuple(args, "s|i", &query, &limit))
return PLy_spi_execute_query(query, limit);
PyErr_Clear();
if ((PyArg_ParseTuple(args, "O|Oi", &plan, &list, &limit)) &&
(is_PLyPlanObject(plan)))
{
PyObject *rv = PLy_spi_execute_plan(plan, list, limit);
return rv;
}
PyErr_SetString(PLy_exc_error, "Expected a query or plan.");
return NULL;
}
PyObject *
PLy_spi_execute_plan(PyObject * ob, PyObject * list, int limit)
{
DECLARE_EXC();
volatile int nargs;
int i,
rv;
PLyPlanObject *plan;
char *nulls;
enter();
if (list != NULL)
{
if ((!PySequence_Check(list)) || (PyString_Check(list)))
{
char *msg = "plpy.execute() takes a sequence as its second argument";
PyErr_SetString(PLy_exc_spi_error, msg);
return NULL;
}
nargs = PySequence_Length(list);
}
else
nargs = 0;
plan = (PLyPlanObject *) ob;
if (nargs != plan->nargs)
{
char *sv;
PyObject *so = PyObject_Str(list);
sv = PyString_AsString(so);
PLy_exception_set(PLy_exc_spi_error,
"Expected sequence of %d arguments, got %d. %s",
plan->nargs, nargs, sv);
Py_DECREF(so);
return NULL;
}
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
/*
* cleanup plan->values array
*/
for (i = 0; i < nargs; i++)
{
if (!plan->args[i].out.d.typbyval &&
(plan->values[i] != (Datum) NULL))
{
pfree(DatumGetPointer(plan->values[i]));
plan->values[i] = (Datum) NULL;
}
}
if (!PyErr_Occurred())
PyErr_SetString(PLy_exc_error,
"Unknown error in PLy_spi_execute_plan");
PLy_elog(WARNING, "in function %s:", PLy_procedure_name(PLy_last_procedure));
RERAISE_EXC();
}
if (nargs)
{
nulls = palloc((nargs + 1) * sizeof(char));
for (i = 0; i < nargs; i++)
{
PyObject *elem,
*so;
char *sv;
elem = PySequence_GetItem(list, i);
if (elem != Py_None)
{
so = PyObject_Str(elem);
sv = PyString_AsString(so);
/*
* FIXME -- if this can elog, we have leak
*/
plan->values[i] = FunctionCall3(&(plan->args[i].out.d.typfunc),
CStringGetDatum(sv),
ObjectIdGetDatum(plan->args[i].out.d.typelem),
Int32GetDatum(-1));
Py_DECREF(so);
Py_DECREF(elem);
nulls[i] = ' ';
}
else
{
Py_DECREF(elem);
plan->values[i] = (Datum) 0;
nulls[i] = 'n';
}
}
nulls[i] = '\0';
}
else
nulls = NULL;
rv = SPI_execp(plan->plan, plan->values, nulls, limit);
RESTORE_EXC();
for (i = 0; i < nargs; i++)
{
if (!plan->args[i].out.d.typbyval &&
(plan->values[i] != (Datum) NULL))
{
pfree(DatumGetPointer(plan->values[i]));
plan->values[i] = (Datum) NULL;
}
}
if (rv < 0)
{
PLy_exception_set(PLy_exc_spi_error,
"Unable to execute plan. SPI_execp failed -- %s",
PLy_spi_error_string(rv));
return NULL;
}
return PLy_spi_execute_fetch_result(SPI_tuptable, SPI_processed, rv);
}
PyObject *
PLy_spi_execute_query(char *query, int limit)
{
DECLARE_EXC();
int rv;
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
if ((!PLy_restart_in_progress) && (!PyErr_Occurred()))
PyErr_SetString(PLy_exc_spi_error,
"Unknown error in PLy_spi_execute_query");
PLy_elog(WARNING, "in function %s:", PLy_procedure_name(PLy_last_procedure));
RERAISE_EXC();
}
rv = SPI_exec(query, limit);
RESTORE_EXC();
if (rv < 0)
{
PLy_exception_set(PLy_exc_spi_error,
"Unable to execute query. SPI_exec failed -- %s",
PLy_spi_error_string(rv));
return NULL;
}
return PLy_spi_execute_fetch_result(SPI_tuptable, SPI_processed, rv);
}
PyObject *
PLy_spi_execute_fetch_result(SPITupleTable *tuptable, int rows, int status)
{
PLyResultObject *result;
enter();
result = (PLyResultObject *) PLy_result_new();
Py_DECREF(result->status);
result->status = PyInt_FromLong(status);
if (status == SPI_OK_UTILITY)
{
Py_DECREF(result->nrows);
result->nrows = PyInt_FromLong(0);
}
else if (status != SPI_OK_SELECT)
{
Py_DECREF(result->nrows);
result->nrows = PyInt_FromLong(rows);
}
else
{
DECLARE_EXC();
PLyTypeInfo args;
int i;
PLy_typeinfo_init(&args);
Py_DECREF(result->nrows);
result->nrows = PyInt_FromLong(rows);
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
if (!PyErr_Occurred())
PyErr_SetString(PLy_exc_error,
"Unknown error in PLy_spi_execute_fetch_result");
Py_DECREF(result);
PLy_typeinfo_dealloc(&args);
RERAISE_EXC();
}
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);
}
RESTORE_EXC();
}
return (PyObject *) result;
}
const char *
PLy_spi_error_string(int code)
{
switch (code)
{
case SPI_ERROR_TYPUNKNOWN:
return "SPI_ERROR_TYPUNKNOWN";
case SPI_ERROR_NOOUTFUNC:
return "SPI_ERROR_NOOUTFUNC";
case SPI_ERROR_NOATTRIBUTE:
return "SPI_ERROR_NOATTRIBUTE";
case SPI_ERROR_TRANSACTION:
return "SPI_ERROR_TRANSACTION";
case SPI_ERROR_PARAM:
return "SPI_ERROR_PARAM";
case SPI_ERROR_ARGUMENT:
return "SPI_ERROR_ARGUMENT";
case SPI_ERROR_CURSOR:
return "SPI_ERROR_CURSOR";
case SPI_ERROR_UNCONNECTED:
return "SPI_ERROR_UNCONNECTED";
case SPI_ERROR_OPUNKNOWN:
return "SPI_ERROR_OPUNKNOWN";
case SPI_ERROR_COPY:
return "SPI_ERROR_COPY";
case SPI_ERROR_CONNECT:
return "SPI_ERROR_CONNECT";
}
return "Unknown or Invalid code";
}
/* language handler and interpreter initialization
*/
/*
* plpython_init() - Initialize everything that can be
* safely initialized during postmaster
* startup.
*
* DO NOT make this static --- it has to be callable by preload
*/
void
plpython_init(void)
{
static volatile int init_active = 0;
/* Do initialization only once */
if (!PLy_first_call)
return;
enter();
if (init_active)
elog(FATAL, "initialization of language module failed");
init_active = 1;
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");
PLy_first_call = 0;
leave();
}
static void
PLy_init_all(void)
{
/* Execute postmaster-startup safe initialization */
if (PLy_first_call)
plpython_init();
/*
* Any other initialization that must be done each time a new backend
* starts -- currently none
*/
}
void
PLy_init_interp(void)
{
PyObject *mainmod;
enter();
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");
}
void
PLy_init_plpy(void)
{
PyObject *main_mod,
*main_dict,
*plpy_mod;
PyObject *plpy,
*plpy_dict;
enter();
/*
* initialize plpy module
*/
PLy_PlanType.ob_type = PLy_ResultType.ob_type = &PyType_Type;
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 init plpy");
}
/* the python interface to the elog function
* don't confuse these with PLy_elog
*/
static PyObject *PLy_output(int, PyObject *, PyObject *);
PyObject *
PLy_debug(PyObject * self, PyObject * args)
{
return PLy_output(DEBUG2, self, args);
}
PyObject *
PLy_log(PyObject * self, PyObject * args)
{
return PLy_output(LOG, self, args);
}
PyObject *
PLy_info(PyObject * self, PyObject * args)
{
return PLy_output(INFO, self, args);
}
PyObject *
PLy_notice(PyObject * self, PyObject * args)
{
return PLy_output(NOTICE, self, args);
}
PyObject *
PLy_warning(PyObject * self, PyObject * args)
{
return PLy_output(WARNING, self, args);
}
PyObject *
PLy_error(PyObject * self, PyObject * args)
{
return PLy_output(ERROR, self, args);
}
PyObject *
PLy_fatal(PyObject * self, PyObject * args)
{
return PLy_output(FATAL, self, args);
}
PyObject *
PLy_output(volatile int level, PyObject * self, PyObject * args)
{
DECLARE_EXC();
PyObject *so;
char *volatile sv;
enter();
if (args == NULL)
elog(WARNING, "args is NULL");
so = PyObject_Str(args);
if ((so == NULL) || ((sv = PyString_AsString(so)) == NULL))
{
level = ERROR;
sv = "Unable to parse error message in `plpy.elog'";
}
/*
* returning NULL here causes the python interpreter to bail. when
* control passes back into plpython_*_handler, we check for python
* exceptions and do the actual elog call. actually PLy_elog.
*/
if (level == ERROR)
{
PyErr_SetString(PLy_exc_error, sv);
return NULL;
}
else if (level >= FATAL)
{
PyErr_SetString(PLy_exc_fatal, sv);
return NULL;
}
/*
* ok, this is a WARNING, or LOG message
*
* but just in case DON'T long jump out of the interpreter!
*/
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
Py_XDECREF(so);
/*
* the real error message should already be written into the
* postgresql log, no? whatever, this shouldn't happen so die
* hideously.
*/
elog(FATAL, "elog threw an unknown exception");
RERAISE_EXC();
}
elog(level, "%s", sv);
RESTORE_EXC();
Py_XDECREF(so);
Py_INCREF(Py_None);
/*
* return a legal object so the interpreter will continue on its merry
* way
*/
return Py_None;
}
/*
* Get the last procedure name called by the backend ( the innermost,
* If a plpython procedure call calls the backend and the backend calls
* another plpython procedure )
*
* NB: this returns SQL name, not the internal Python procedure name
*/
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 char *PLy_traceback(int *);
static char *PLy_vprintf(const char *fmt, va_list ap);
static char *PLy_printf(const char *fmt,...);
void
PLy_exception_set(PyObject * exc, const char *fmt,...)
{
char buf[1024];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
PyErr_SetString(exc, buf);
}
void
PLy_elog(int elevel, const char *fmt,...)
{
DECLARE_EXC();
va_list ap;
char *xmsg,
*emsg;
int xlevel;
enter();
xmsg = PLy_traceback(&xlevel);
va_start(ap, fmt);
emsg = PLy_vprintf(fmt, ap);
va_end(ap);
SAVE_EXC();
if (TRAP_EXC())
{
RESTORE_EXC();
mark();
/*
* elog called siglongjmp. cleanup, restore and reraise
*/
PLy_restart_in_progress += 1;
PLy_free(emsg);
if (xmsg)
PLy_free(xmsg);
RERAISE_EXC();
}
ereport(elevel,
(errmsg("plpython: %s", emsg),
(xmsg) ? errdetail("%s", xmsg) : 0));
PLy_free(emsg);
if (xmsg)
PLy_free(xmsg);
leave();
RESTORE_EXC();
}
char *
PLy_traceback(int *xlevel)
{
PyObject *e,
*v,
*tb;
PyObject *eob,
*vob = NULL;
char *vstr,
*estr,
*xstr = NULL;
enter();
/*
* 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);
eob = PyObject_Str(e);
if ((v) && ((vob = PyObject_Str(v)) != NULL))
vstr = PyString_AsString(vob);
else
vstr = "Unknown";
estr = PyString_AsString(eob);
xstr = PLy_printf("%s: %s", estr, vstr);
Py_DECREF(eob);
Py_XDECREF(vob);
/*
* intuit an appropriate error level for 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;
leave();
return xstr;
}
char *
PLy_printf(const char *fmt,...)
{
va_list ap;
char *emsg;
va_start(ap, fmt);
emsg = PLy_vprintf(fmt, ap);
va_end(ap);
return emsg;
}
char *
PLy_vprintf(const char *fmt, va_list ap)
{
size_t blen;
int bchar,
tries = 2;
char *buf;
blen = strlen(fmt) * 2;
if (blen < 256)
blen = 256;
buf = PLy_malloc(blen * sizeof(char));
while (1)
{
bchar = vsnprintf(buf, blen, fmt, ap);
if ((bchar > 0) && (bchar < blen))
return buf;
if (tries-- <= 0)
break;
if (blen > 0)
blen = bchar + 1;
else
blen *= 2;
buf = PLy_realloc(buf, blen);
}
PLy_free(buf);
return NULL;
}
/* python module code
*/
/* some dumb utility functions
*/
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;
}
void *
PLy_realloc(void *optr, size_t bytes)
{
void *nptr = realloc(optr, bytes);
if (nptr == NULL)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return nptr;
}
/* define this away
*/
void
PLy_free(void *ptr)
{
free(ptr);
}
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