Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

executable file 614 lines (492 sloc) 14.458 kb
/*
* PL/R - PostgreSQL support for R as a
* procedural language (PL)
*
* Copyright (c) 2003 by Joseph E. Conway
* ALL RIGHTS RESERVED
*
* Joe Conway <mail@joeconway.com>
*
* Based on pltcl by Jan Wieck
* and inspired by REmbeddedPostgres by
* Duncan Temple Lang <duncan@research.bell-labs.com>
* http://www.omegahat.org/RSPostgres/
*
* License: GPL version 2 or newer. http://www.gnu.org/copyleft/gpl.html
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* pg_rsupport.c - Postgres support for use within plr functions
*/
#include "plr.h"
extern MemoryContext plr_SPI_context;
extern char *last_R_error_msg;
static SEXP rpgsql_get_results(int ntuples, SPITupleTable *tuptable);
static void rsupport_error_callback(void *arg);
/* The information we cache prepared plans */
typedef struct saved_plan_desc
{
void *saved_plan;
int nargs;
Oid *typeids;
Oid *typelems;
FmgrInfo *typinfuncs;
} saved_plan_desc;
/*
* Functions used in R
*****************************************************************************/
void
throw_pg_notice(const char **msg)
{
/* skip error CONTEXT for explicitly called messages */
SAVE_PLERRCONTEXT;
if (msg && *msg)
elog(NOTICE, "%s", *msg);
else
elog(NOTICE, "%s", "");
RESTORE_PLERRCONTEXT;
}
/*
* plr_quote_literal() - quote literal strings that are to
* be used in SPI_exec query strings
*/
SEXP
plr_quote_literal(SEXP rval)
{
char *value;
text *value_text;
text *result_text;
SEXP result;
/* extract the C string */
PROTECT(rval = AS_CHARACTER(rval));
value = CHAR(STRING_ELT(rval, 0));
/* convert using the pgsql quote_literal function */
value_text = PG_STR_GET_TEXT(value);
result_text = DatumGetTextP(DirectFunctionCall1(quote_literal, PointerGetDatum(value_text)));
/* copy result back into an R object */
PROTECT(result = NEW_CHARACTER(1));
SET_STRING_ELT(result, 0, COPY_TO_USER_STRING(PG_TEXT_GET_STR(result_text)));
UNPROTECT(2);
return result;
}
/*
* plr_quote_literal() - quote identifiers that are to
* be used in SPI_exec query strings
*/
SEXP
plr_quote_ident(SEXP rval)
{
char *value;
text *value_text;
text *result_text;
SEXP result;
/* extract the C string */
PROTECT(rval = AS_CHARACTER(rval));
value = CHAR(STRING_ELT(rval, 0));
/* convert using the pgsql quote_literal function */
value_text = PG_STR_GET_TEXT(value);
result_text = DatumGetTextP(DirectFunctionCall1(quote_ident, PointerGetDatum(value_text)));
/* copy result back into an R object */
PROTECT(result = NEW_CHARACTER(1));
SET_STRING_ELT(result, 0, COPY_TO_USER_STRING(PG_TEXT_GET_STR(result_text)));
UNPROTECT(2);
return result;
}
/*
* plr_SPI_exec - The builtin SPI_exec command for the R interpreter
*/
SEXP
plr_SPI_exec(SEXP rsql)
{
int spi_rc;
char buf[64];
char *sql;
int count = 0;
int ntuples;
SEXP result = NULL;
MemoryContext oldcontext;
ERRORCONTEXTCALLBACK;
/* set up error context */
PUSH_PLERRCONTEXT(rsupport_error_callback, "pg.spi.exec");
PROTECT(rsql = AS_CHARACTER(rsql));
sql = CHAR(STRING_ELT(rsql, 0));
if (sql == NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cannot exec empty query")));
/* switch to SPI memory context */
oldcontext = MemoryContextSwitchTo(plr_SPI_context);
/* Execute the query and handle return codes */
spi_rc = SPI_exec(sql, count);
/* back to caller's memory context */
MemoryContextSwitchTo(oldcontext);
switch (spi_rc)
{
case SPI_OK_UTILITY:
snprintf(buf, sizeof(buf), "%d", 0);
SPI_freetuptable(SPI_tuptable);
PROTECT(result = NEW_CHARACTER(1));
SET_STRING_ELT(result, 0, COPY_TO_USER_STRING(buf));
UNPROTECT(1);
return result;
case SPI_OK_SELINTO:
case SPI_OK_INSERT:
case SPI_OK_DELETE:
case SPI_OK_UPDATE:
snprintf(buf, sizeof(buf), "%d", SPI_processed);
SPI_freetuptable(SPI_tuptable);
PROTECT(result = NEW_CHARACTER(1));
SET_STRING_ELT(result, 0, COPY_TO_USER_STRING(buf));
UNPROTECT(1);
return result;
case SPI_OK_SELECT:
break;
case SPI_ERROR_ARGUMENT:
elog(ERROR, "SPI_exec() failed - SPI_ERROR_ARGUMENT");
case SPI_ERROR_UNCONNECTED:
elog(ERROR, "SPI_exec() failed - SPI_ERROR_UNCONNECTED");
case SPI_ERROR_COPY:
elog(ERROR, "SPI_exec() failed - SPI_ERROR_COPY");
case SPI_ERROR_CURSOR:
elog(ERROR, "SPI_exec() failed - SPI_ERROR_CURSOR");
case SPI_ERROR_TRANSACTION:
elog(ERROR, "SPI_exec() failed - SPI_ERROR_TRANSACTION");
case SPI_ERROR_OPUNKNOWN:
elog(ERROR, "SPI_exec() failed - SPI_ERROR_OPUNKNOWN");
default:
snprintf(buf, sizeof(buf), "%d", spi_rc);
elog(ERROR, "SPI_exec() failed - unknown RC");
}
/*
* Only SELECT queries fall through to here - remember the
* tuples we got
*/
ntuples = SPI_processed;
if (ntuples > 0)
{
result = rpgsql_get_results(ntuples, SPI_tuptable);
SPI_freetuptable(SPI_tuptable);
}
else
result = R_NilValue;
POP_PLERRCONTEXT;
return result;
}
static SEXP
rpgsql_get_results(int ntuples, SPITupleTable *tuptable)
{
SEXP result;
ERRORCONTEXTCALLBACK;
/* set up error context */
PUSH_PLERRCONTEXT(rsupport_error_callback, "rpgsql_get_results");
if (tuptable != NULL)
{
HeapTuple *tuples = tuptable->vals;
TupleDesc tupdesc = tuptable->tupdesc;
result = pg_tuple_get_r_frame(ntuples, tuples, tupdesc);
}
else
result = R_NilValue;
POP_PLERRCONTEXT;
return result;
}
/*
* plr_SPI_prepare - The builtin SPI_prepare command for the R interpreter
*/
SEXP
plr_SPI_prepare(SEXP rsql, SEXP rargtypes)
{
char *sql;
int nargs;
int i;
Oid *typeids = NULL;
Oid *typelems = NULL;
FmgrInfo *typinfuncs = NULL;
void *pplan;
void *saved_plan;
saved_plan_desc *plan_desc;
SEXP result;
MemoryContext oldcontext;
ERRORCONTEXTCALLBACK;
/* set up error context */
PUSH_PLERRCONTEXT(rsupport_error_callback, "pg.spi.prepare");
/* switch to long lived context to create plan description */
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
plan_desc = (saved_plan_desc *) palloc(sizeof(saved_plan_desc));
MemoryContextSwitchTo(oldcontext);
PROTECT(rsql = AS_CHARACTER(rsql));
sql = CHAR(STRING_ELT(rsql, 0));
if (sql == NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cannot prepare empty query")));
PROTECT(rargtypes = AS_INTEGER(rargtypes));
if (!isVector(rargtypes) || !isInteger(rargtypes))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("second parameter must be a vector of PostgreSQL " \
"datatypes")));
/* deal with case of no parameters for the prepared query */
if (rargtypes == R_MissingArg || INTEGER(rargtypes)[0] == NA_INTEGER)
nargs = 0;
else
nargs = length(rargtypes);
if (nargs < 0) /* can this even happen?? */
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("second parameter must be a vector of PostgreSQL " \
"datatypes")));
if (nargs > 0)
{
/* switch to long lived context to create plan description elements */
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
typeids = (Oid *) palloc(nargs * sizeof(Oid));
typelems = (Oid *) palloc(nargs * sizeof(Oid));
typinfuncs = (FmgrInfo *) palloc(nargs * sizeof(FmgrInfo));
MemoryContextSwitchTo(oldcontext);
for (i = 0; i < nargs; i++)
{
int16 typlen;
bool typbyval;
char typdelim;
Oid typinput,
typelem;
char typalign;
FmgrInfo typinfunc;
typeids[i] = (int) VECTOR_ELT(rargtypes, i);
/* switch to long lived context to create plan description elements */
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
get_type_io_data(typeids[i], IOFunc_input, &typlen, &typbyval,
&typalign, &typdelim, &typelem, &typinput);
typelems[i] = typelem;
MemoryContextSwitchTo(oldcontext);
/* perm_fmgr_info already uses TopMemoryContext */
perm_fmgr_info(typinput, &typinfunc);
typinfuncs[i] = typinfunc;
}
}
else
typeids = NULL;
/* switch to SPI memory context */
oldcontext = MemoryContextSwitchTo(plr_SPI_context);
/* Prepare plan for query */
pplan = SPI_prepare(sql, nargs, typeids);
UNPROTECT(2);
if (pplan == NULL)
{
char buf[128];
char *reason;
switch (SPI_result)
{
case SPI_ERROR_ARGUMENT:
reason = "SPI_ERROR_ARGUMENT";
break;
case SPI_ERROR_UNCONNECTED:
reason = "SPI_ERROR_UNCONNECTED";
break;
case SPI_ERROR_COPY:
reason = "SPI_ERROR_COPY";
break;
case SPI_ERROR_CURSOR:
reason = "SPI_ERROR_CURSOR";
break;
case SPI_ERROR_TRANSACTION:
reason = "SPI_ERROR_TRANSACTION";
break;
case SPI_ERROR_OPUNKNOWN:
reason = "SPI_ERROR_OPUNKNOWN";
break;
default:
snprintf(buf, sizeof(buf), "unknown RC %d", SPI_result);
reason = buf;
break;
}
/* internal error */
elog(ERROR, "SPI_prepare failed - %s", reason);
}
/* SPI_saveplan already uses TopMemoryContext */
saved_plan = SPI_saveplan(pplan);
if (saved_plan == NULL)
{
char buf[128];
char *reason;
switch (SPI_result)
{
case SPI_ERROR_ARGUMENT:
reason = "SPI_ERROR_ARGUMENT";
break;
case SPI_ERROR_UNCONNECTED:
reason = "SPI_ERROR_UNCONNECTED";
break;
default:
snprintf(buf, sizeof(buf), "unknown RC %d", SPI_result);
reason = buf;
break;
}
/* internal error */
elog(ERROR, "SPI_saveplan failed - %s", reason);
}
/* back to caller's memory context */
MemoryContextSwitchTo(oldcontext);
/* no longer need this */
SPI_freeplan(pplan);
plan_desc->saved_plan = saved_plan;
plan_desc->nargs = nargs;
plan_desc->typeids = typeids;
plan_desc->typelems = typelems;
plan_desc->typinfuncs = typinfuncs;
result = R_MakeExternalPtr(plan_desc, R_NilValue, R_NilValue);
POP_PLERRCONTEXT;
return result;
}
/*
* plr_SPI_execp - The builtin SPI_execp command for the R interpreter
*/
SEXP
plr_SPI_execp(SEXP rsaved_plan, SEXP rargvalues)
{
saved_plan_desc *plan_desc = (saved_plan_desc *) R_ExternalPtrAddr(rsaved_plan);
void *saved_plan = plan_desc->saved_plan;
int nargs = plan_desc->nargs;
Oid *typelems = plan_desc->typelems;
FmgrInfo *typinfuncs = plan_desc->typinfuncs;
int i;
Datum *argvalues = NULL;
char *nulls = NULL;
bool isnull = false;
SEXP obj;
int spi_rc;
char buf[64];
int count = 0;
int ntuples;
SEXP result;
MemoryContext oldcontext;
ERRORCONTEXTCALLBACK;
/* set up error context */
PUSH_PLERRCONTEXT(rsupport_error_callback, "pg.spi.execp");
if (nargs > 0)
{
if (!IS_LIST(rargvalues))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("second parameter must be a list of arguments " \
"to the prepared plan")));
if (length(rargvalues) != nargs)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("list of arguments (%d) is not the same length " \
"as that of the prepared plan (%d)",
length(rargvalues), nargs)));
argvalues = (Datum *) palloc(nargs * sizeof(Datum));
nulls = (char *) palloc(nargs * sizeof(char));
}
for (i = 0; i < nargs; i++)
{
PROTECT(obj = VECTOR_ELT(rargvalues, i));
argvalues[i] = get_scalar_datum(obj, typinfuncs[i], typelems[i], &isnull);
if (!isnull)
nulls[i] = ' ';
else
nulls[i] = 'n';
UNPROTECT(1);
}
/* switch to SPI memory context */
oldcontext = MemoryContextSwitchTo(plr_SPI_context);
/* Execute the plan */
spi_rc = SPI_execp(saved_plan, argvalues, nulls, count);
/* back to caller's memory context */
MemoryContextSwitchTo(oldcontext);
/* check the result */
switch (spi_rc)
{
case SPI_OK_UTILITY:
snprintf(buf, sizeof(buf), "%d", 0);
SPI_freetuptable(SPI_tuptable);
PROTECT(result = NEW_CHARACTER(1));
SET_STRING_ELT(result, 0, COPY_TO_USER_STRING(buf));
UNPROTECT(1);
return result;
case SPI_OK_SELINTO:
case SPI_OK_INSERT:
case SPI_OK_DELETE:
case SPI_OK_UPDATE:
snprintf(buf, sizeof(buf), "%d", SPI_processed);
SPI_freetuptable(SPI_tuptable);
PROTECT(result = NEW_CHARACTER(1));
SET_STRING_ELT(result, 0, COPY_TO_USER_STRING(buf));
UNPROTECT(1);
return result;
case SPI_OK_SELECT:
break;
case SPI_ERROR_ARGUMENT:
elog(ERROR, "SPI_execp() failed - SPI_ERROR_ARGUMENT");
case SPI_ERROR_UNCONNECTED:
elog(ERROR, "SPI_execp() failed - SPI_ERROR_UNCONNECTED");
case SPI_ERROR_COPY:
elog(ERROR, "SPI_execp() failed - SPI_ERROR_COPY");
case SPI_ERROR_CURSOR:
elog(ERROR, "SPI_execp() failed - SPI_ERROR_CURSOR");
case SPI_ERROR_TRANSACTION:
elog(ERROR, "SPI_execp() failed - SPI_ERROR_TRANSACTION");
case SPI_ERROR_OPUNKNOWN:
elog(ERROR, "SPI_execp() failed - SPI_ERROR_OPUNKNOWN");
default:
snprintf(buf, sizeof(buf), "%d", spi_rc);
elog(ERROR, "SPI_execp() failed - unknown RC");
}
/*
* Only SELECT queries fall through to here - remember the
* tuples we got
*/
ntuples = SPI_processed;
if (ntuples > 0)
{
result = rpgsql_get_results(ntuples, SPI_tuptable);
SPI_freetuptable(SPI_tuptable);
}
else
result = R_NilValue;
POP_PLERRCONTEXT;
return result;
}
/*
* plr_SPI_lastoid - return the last oid. To be used after insert queries.
*/
SEXP
plr_SPI_lastoid(void)
{
SEXP result;
PROTECT(result = NEW_INTEGER(1));
INTEGER_DATA(result)[0] = SPI_lastoid;
UNPROTECT(1);
return result;
}
void
throw_r_error(const char **msg)
{
if (msg && *msg)
last_R_error_msg = pstrdup(*msg);
else
last_R_error_msg = pstrdup("caught error calling R function");
}
/*
* error context callback to let us supply a call-stack traceback
*/
static void
rsupport_error_callback(void *arg)
{
if (arg)
errcontext("In R support function %s", (char *) arg);
}
Jump to Line
Something went wrong with that request. Please try again.