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/*-------------------------------------------------------------------------
*
* pg_parameter_acl.c
* routines to support manipulation of the pg_parameter_acl relation
*
* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/catalog/pg_parameter_acl.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/table.h"
#include "catalog/catalog.h"
#include "catalog/indexing.h"
#include "catalog/objectaccess.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_parameter_acl.h"
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/pg_locale.h"
#include "utils/rel.h"
#include "utils/syscache.h"
/*
* ParameterAclLookup - Given a configuration parameter name,
* look up the associated configuration parameter ACL's OID.
*
* If missing_ok is false, throw an error if ACL entry not found. If
* true, just return InvalidOid.
*/
Oid
ParameterAclLookup(const char *parameter, bool missing_ok)
{
Oid oid;
char *parname;
/* Convert name to the form it should have in pg_parameter_acl... */
parname = convert_GUC_name_for_parameter_acl(parameter);
/* ... and look it up */
oid = GetSysCacheOid1(PARAMETERACLNAME, Anum_pg_parameter_acl_oid,
PointerGetDatum(cstring_to_text(parname)));
if (!OidIsValid(oid) && !missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("parameter ACL \"%s\" does not exist", parameter)));
pfree(parname);
return oid;
}
/*
* ParameterAclCreate
*
* Add a new tuple to pg_parameter_acl.
*
* parameter: the parameter name to create an entry for.
* Caller should have verified that there's no such entry already.
*
* Returns the new entry's OID.
*/
Oid
ParameterAclCreate(const char *parameter)
{
Oid parameterId;
char *parname;
Relation rel;
TupleDesc tupDesc;
HeapTuple tuple;
Datum values[Natts_pg_parameter_acl] = {0};
bool nulls[Natts_pg_parameter_acl] = {0};
/*
* To prevent cluttering pg_parameter_acl with useless entries, insist
* that the name be valid.
*/
check_GUC_name_for_parameter_acl(parameter);
/* Convert name to the form it should have in pg_parameter_acl. */
parname = convert_GUC_name_for_parameter_acl(parameter);
/*
* Create and insert a new record containing a null ACL.
*
* We don't take a strong enough lock to prevent concurrent insertions,
* relying instead on the unique index.
*/
rel = table_open(ParameterAclRelationId, RowExclusiveLock);
tupDesc = RelationGetDescr(rel);
parameterId = GetNewOidWithIndex(rel,
ParameterAclOidIndexId,
Anum_pg_parameter_acl_oid);
values[Anum_pg_parameter_acl_oid - 1] = ObjectIdGetDatum(parameterId);
values[Anum_pg_parameter_acl_parname - 1] =
PointerGetDatum(cstring_to_text(parname));
nulls[Anum_pg_parameter_acl_paracl - 1] = true;
tuple = heap_form_tuple(tupDesc, values, nulls);
CatalogTupleInsert(rel, tuple);
/* Close pg_parameter_acl, but keep lock till commit. */
heap_freetuple(tuple);
table_close(rel, NoLock);
return parameterId;
}
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