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414 lines (363 loc) · 7.19 KB
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/*
* Postgres interface functions
*/
#include <setjmp.h>
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include <structmember.h>
#include "postgres.h"
#include "fmgr.h"
#include "tcop/tcopprot.h"
#include "access/htup.h"
#include "access/hio.h"
#include "access/heapam.h"
#include "access/tupdesc.h"
#include "access/transam.h"
#include "catalog/pg_type.h"
#include "executor/spi.h"
#include "lib/stringinfo.h"
#include "parser/parse_type.h"
#include "utils/memutils.h"
#include "utils/array.h"
#include "utils/datum.h"
#include "utils/relcache.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
#include "utils/tuplestore.h"
#include "mb/pg_wchar.h"
#include "pypg/python.h"
#include "pypg/postgres.h"
#include "pypg/extension.h"
#include "pypg/pl.h"
#include "pypg/error.h"
#include "pypg/tupledesc.h"
#include "pypg/type/type.h"
#include "pypg/type/object.h"
#include "pypg/type/system.h"
/*
* It's "Postgres data", so put it here instead of pl.c.
*/
PyObj py_my_datname_str_ob = NULL;
/*
* palloc interface that catches any OOM errors.
*/
void *
Py_palloc(Size memsize)
{
void * volatile rptr = NULL;
PG_TRY();
{
rptr = palloc(memsize);
}
PG_CATCH();
{
PyErr_SetPgError(false);
}
PG_END_TRY();
return(rptr);
}
Datum
Py_datumCopy(Datum d, bool typbyval, int typlen)
{
volatile Datum rd = 0;
if (typbyval)
return(d);
PG_TRY();
{
/* -1 == VARLENA */
if (typlen == -1)
{
/*
* Always work with detoasted data.
*/
rd = PointerGetDatum(PG_DETOAST_DATUM_COPY(d));
}
else
rd = datumCopy(d, false, typlen);
}
PG_CATCH();
{
PyErr_SetPgError(false);
}
PG_END_TRY();
return((Datum) rd);
}
TupleDesc
Py_CreateTupleDescCopy(TupleDesc td)
{
volatile TupleDesc ntd = NULL;
PG_TRY();
{
ntd = CreateTupleDescCopy(td);
ntd->tdrefcount = -1;
}
PG_CATCH();
{
PyErr_SetPgError(false);
}
PG_END_TRY();
return((TupleDesc) ntd);
}
TupleDesc
Py_CreateTupleDescCopyConstr(TupleDesc td)
{
volatile TupleDesc ntd = NULL;
PG_TRY();
{
ntd = CreateTupleDescCopyConstr(td);
ntd->tdrefcount = -1;
}
PG_CATCH();
{
PyErr_SetPgError(false);
}
PG_END_TRY();
return(ntd);
}
void
Py_FreeTupleDesc(TupleDesc td)
{
PG_TRY();
{
FreeTupleDesc(td);
}
PG_CATCH();
{
PyErr_SetPgError(false);
}
PG_END_TRY();
}
/*
* Convert the Python object to an Oid.
*/
int
Oid_FromPyObject(PyObj ob, Oid *out)
{
const static unsigned long maxoid = 0xFFFFFFFF;
unsigned long tmpul;
PyObj tmp;
*out = InvalidOid;
/*
* Special case the reg* types and Oid itself.
*/
if (PyPgObject_Check(ob))
{
Oid typeoid = PyPgType_GetOid(Py_TYPE(ob));
switch (typeoid)
{
case REGPROCEDUREOID:
case REGCLASSOID:
case REGOPEROID:
case REGOPERATOROID:
case REGPROCOID:
case REGTYPEOID:
case OIDOID:
*out = DatumGetObjectId(PyPgObject_GetDatum(ob));
return(0);
break;
default:
/*
* Fall through to PyNumber_Long conversion.
*/
break;
}
}
/*
* Convert to long and get the unsigned long.
*/
tmp = PyNumber_Long(ob);
if (tmp == NULL)
return(-1);
tmpul = PyLong_AsUnsignedLong(tmp);
Py_DECREF(tmp);
if (PyErr_Occurred())
return(-1);
if (tmpul > maxoid)
{
PyErr_SetString(PyExc_OverflowError,
"number object overflows Oid");
}
*out = (Oid) tmpul;
return(0);
}
/*
* Py_NormalizeRow - unroll the given PyObject into an PyTupleObject
*
* This routine is used by type/record.c and pl.c to construct a tuple
* object that is appropriate for use with Py_BuildDatumsAndNulls
*/
PyObj
Py_NormalizeRow(int rnatts, TupleDesc td, PyObj namemap, PyObj row)
{
PyObj rob;
if (PyDict_CheckExact(row))
{
Py_ssize_t pos = 0;
PyObj key, val;
rob = PyTuple_New(rnatts);
if (rob == NULL)
return(NULL);
while (PyDict_Next(row, &pos, &key, &val))
{
unsigned long l;
PyObj idx;
if (!PySequence_Contains(namemap, key))
{
Py_DECREF(rob);
PyErr_SetObject(PyExc_KeyError, key);
return(NULL);
}
idx = PyDict_GetItem(namemap, key);
l = PyLong_AsUnsignedLong(idx);
if (l >= rnatts || l < 0)
{
/*
* Near "can't happen" case as the namemap
* is built against the given TupleDesc.
*/
PyErr_SetString(PyExc_RuntimeError,
"key resolved to invalid offset");
Py_DECREF(rob);
return(NULL);
}
PyTuple_SET_ITEM(rob, (Py_ssize_t) l, val);
Py_INCREF(val);
}
/*
* Fill in the NULLs with None.
*/
for (pos = 0; pos < rnatts; ++pos)
{
val = PyTuple_GET_ITEM(rob, pos);
if (val == NULL)
{
PyTuple_SET_ITEM(rob, pos, Py_None);
Py_INCREF(Py_None);
}
}
}
else if (PySequence_Check(row) || PyIter_Check(row))
{
if (PyTuple_Check(row))
{
rob = row;
Py_INCREF(rob);
}
else
{
rob = Py_Call((PyObj) &PyTuple_Type, row);
if (rob == NULL)
return(NULL);
}
if (PyTuple_GET_SIZE(rob) != rnatts)
{
PyErr_Format(PyExc_TypeError,
"descriptor requires exactly %d attributes, given sequence has %d items",
rnatts, PyTuple_GET_SIZE(rob));
Py_DECREF(rob);
rob = NULL;
}
}
else
{
PyErr_Format(PyExc_TypeError,
"cannot normalize row from '%s'", Py_TYPE(row)->tp_name);
rob = NULL;
}
return(rob);
}
/*
* Py_BuildDatumsAndNulls - create datums from PyPgTypes and and objects.
*
* Given a TupleDesc, td, an array of PyPgTypes, typs, and an array
* of arbitrary Python objects, fill in the preallocated values and
* nulls with the result of the tp_new_datum calls.
*
* On failure, a Postgres error is raised.
*/
void
Py_BuildDatumsAndNulls(
TupleDesc td,
PyObj typs, PyObj row,
Datum *values, bool *nulls)
{
Form_pg_attribute *att = td->attrs;
int a, i, natts = td->natts;
for (i = 0, a = 0; i < natts; ++i)
{
PyObj ob, typ;
if (att[i]->attisdropped)
{
nulls[i] = true;
values[i] = 0;
continue;
}
ob = PyTuple_GET_ITEM(row, a);
typ = PyTuple_GET_ITEM(typs, i);
if (ob == Py_None)
{
nulls[i] = true;
values[i] = 0;
}
else
{
/*
* Postgres ERROR thrown on failure.
*/
PyPgType_DatumNew(
typ, ob, att[i]->atttypmod,
&(values[i]), &(nulls[i]));
}
++a;
}
}
void
FreeReferences(int *byrefmap, Datum *values, bool *nulls)
{
int i = 0, attoff;
while ((attoff = byrefmap[i]) != -1)
{
if (!nulls[attoff])
pfree(DatumGetPointer(values[attoff]));
++i;
}
}
void
FreeDatumsAndNulls(int *byrefmap, Datum *values, bool *nulls)
{
FreeReferences(byrefmap, values, nulls);
pfree(nulls);
pfree(values);
}
void
raise_spi_error(int spi_error)
{
switch (spi_error)
{
case SPI_ERROR_COPY:
ereport(ERROR, (
errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
errmsg("copy commands prohibited")));
break;
case SPI_ERROR_TRANSACTION:
ereport(ERROR, (
errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
errmsg("transaction commands prohibited"),
errhint("The \"xact()\" context manager can be used to start a subtransaction.")));
break;
case SPI_ERROR_PARAM:
/*
* This case *should* be caught before it's possible.
*/
elog(ERROR, "statement requires parameters");
break;
case SPI_ERROR_ARGUMENT:
/* PL programming error */
elog(ERROR, "invalid arguments given to SPI interface");
break;
default:
elog(ERROR, "unexpected SPI error(%d): %s",
spi_error, SPI_result_code_string(spi_error));
break;
}
}