pg_db_role_setting.c File Reference

#include "postgres.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/tableam.h"
#include "catalog/indexing.h"
#include "catalog/objectaccess.h"
#include "catalog/pg_db_role_setting.h"
#include "utils/fmgroids.h"
#include "utils/rel.h"

Include dependency graph for pg_db_role_setting.c:

Go to the source code of this file.

Functions
void	AlterSetting (Oid databaseid, Oid roleid, VariableSetStmt *setstmt)
void	DropSetting (Oid databaseid, Oid roleid)
void	ApplySetting (Snapshot snapshot, Oid databaseid, Oid roleid, Relation relsetting, GucSource source)

Function Documentation

AlterSetting()

void AlterSetting	(	Oid	databaseid,
		Oid	roleid,
		VariableSetStmt *	setstmt
	)

Definition at line 24 of file pg_db_role_setting.c.

{
    char       *valuestr;
    HeapTuple   tuple;
    Relation    rel;
    ScanKeyData scankey[2];
    SysScanDesc scan;
 
    valuestr = ExtractSetVariableArgs(setstmt);
 
    /* Get the old tuple, if any. */
 
    rel = table_open(DbRoleSettingRelationId, RowExclusiveLock);
    ScanKeyInit(&scankey[0],
                Anum_pg_db_role_setting_setdatabase,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(databaseid));
    ScanKeyInit(&scankey[1],
                Anum_pg_db_role_setting_setrole,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(roleid));
    scan = systable_beginscan(rel, DbRoleSettingDatidRolidIndexId, true,
                              NULL, 2, scankey);
    tuple = systable_getnext(scan);
 
    /*
     * There are three cases:
     *
     * - in RESET ALL, request GUC to reset the settings array and update the
     * catalog if there's anything left, delete it otherwise
     *
     * - in other commands, if there's a tuple in pg_db_role_setting, update
     * it; if it ends up empty, delete it
     *
     * - otherwise, insert a new pg_db_role_setting tuple, but only if the
     * command is not RESET
     */
    if (setstmt->kind == VAR_RESET_ALL)
    {
        if (HeapTupleIsValid(tuple))
        {
            ArrayType  *new = NULL;
            Datum       datum;
            bool        isnull;
 
            datum = heap_getattr(tuple, Anum_pg_db_role_setting_setconfig,
                                 RelationGetDescr(rel), &isnull);
 
            if (!isnull)
                new = GUCArrayReset(DatumGetArrayTypeP(datum));
 
            if (new)
            {
                Datum       repl_val[Natts_pg_db_role_setting];
                bool        repl_null[Natts_pg_db_role_setting];
                bool        repl_repl[Natts_pg_db_role_setting];
                HeapTuple   newtuple;
 
                memset(repl_repl, false, sizeof(repl_repl));
 
                repl_val[Anum_pg_db_role_setting_setconfig - 1] =
                    PointerGetDatum(new);
                repl_repl[Anum_pg_db_role_setting_setconfig - 1] = true;
                repl_null[Anum_pg_db_role_setting_setconfig - 1] = false;
 
                newtuple = heap_modify_tuple(tuple, RelationGetDescr(rel),
                                             repl_val, repl_null, repl_repl);
                CatalogTupleUpdate(rel, &tuple->t_self, newtuple);
            }
            else
                CatalogTupleDelete(rel, &tuple->t_self);
        }
    }
    else if (HeapTupleIsValid(tuple))
    {
        Datum       repl_val[Natts_pg_db_role_setting];
        bool        repl_null[Natts_pg_db_role_setting];
        bool        repl_repl[Natts_pg_db_role_setting];
        HeapTuple   newtuple;
        Datum       datum;
        bool        isnull;
        ArrayType  *a;
 
        memset(repl_repl, false, sizeof(repl_repl));
        repl_repl[Anum_pg_db_role_setting_setconfig - 1] = true;
        repl_null[Anum_pg_db_role_setting_setconfig - 1] = false;
 
        /* Extract old value of setconfig */
        datum = heap_getattr(tuple, Anum_pg_db_role_setting_setconfig,
                             RelationGetDescr(rel), &isnull);
        a = isnull ? NULL : DatumGetArrayTypeP(datum);
 
        /* Update (valuestr is NULL in RESET cases) */
        if (valuestr)
            a = GUCArrayAdd(a, setstmt->name, valuestr);
        else
            a = GUCArrayDelete(a, setstmt->name);
 
        if (a)
        {
            repl_val[Anum_pg_db_role_setting_setconfig - 1] =
                PointerGetDatum(a);
 
            newtuple = heap_modify_tuple(tuple, RelationGetDescr(rel),
                                         repl_val, repl_null, repl_repl);
            CatalogTupleUpdate(rel, &tuple->t_self, newtuple);
        }
        else
            CatalogTupleDelete(rel, &tuple->t_self);
    }
    else if (valuestr)
    {
        /* non-null valuestr means it's not RESET, so insert a new tuple */
        HeapTuple   newtuple;
        Datum       values[Natts_pg_db_role_setting];
        bool        nulls[Natts_pg_db_role_setting];
        ArrayType  *a;
 
        memset(nulls, false, sizeof(nulls));
 
        a = GUCArrayAdd(NULL, setstmt->name, valuestr);
 
        values[Anum_pg_db_role_setting_setdatabase - 1] =
            ObjectIdGetDatum(databaseid);
        values[Anum_pg_db_role_setting_setrole - 1] = ObjectIdGetDatum(roleid);
        values[Anum_pg_db_role_setting_setconfig - 1] = PointerGetDatum(a);
        newtuple = heap_form_tuple(RelationGetDescr(rel), values, nulls);
 
        CatalogTupleInsert(rel, newtuple);
    }
    else
    {
        /*
         * RESET doesn't need to change any state if there's no pre-existing
         * pg_db_role_setting entry, but for consistency we should still check
         * that the option is valid and we're allowed to set it.
         */
        (void) GUCArrayDelete(NULL, setstmt->name);
    }
 
    InvokeObjectPostAlterHookArg(DbRoleSettingRelationId,
                                 databaseid, 0, roleid, false);
 
    systable_endscan(scan);
 
    /* Close pg_db_role_setting, but keep lock till commit */
    table_close(rel, NoLock);
}

References a, BTEqualStrategyNumber, CatalogTupleDelete(), CatalogTupleInsert(), CatalogTupleUpdate(), DatumGetArrayTypeP, ExtractSetVariableArgs(), GUCArrayAdd(), GUCArrayDelete(), GUCArrayReset(), heap_form_tuple(), heap_getattr(), heap_modify_tuple(), HeapTupleIsValid, InvokeObjectPostAlterHookArg, VariableSetStmt::kind, VariableSetStmt::name, NoLock, ObjectIdGetDatum(), PointerGetDatum(), RelationGetDescr, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), table_open(), values, and VAR_RESET_ALL.

Referenced by AlterDatabaseSet(), and AlterRoleSet().

ApplySetting()

void ApplySetting	(	Snapshot	snapshot,
		Oid	databaseid,
		Oid	roleid,
		Relation	relsetting,
		GucSource	source
	)

Definition at line 229 of file pg_db_role_setting.c.

{
    SysScanDesc scan;
    ScanKeyData keys[2];
    HeapTuple   tup;
 
    ScanKeyInit(&keys[0],
                Anum_pg_db_role_setting_setdatabase,
                BTEqualStrategyNumber,
                F_OIDEQ,
                ObjectIdGetDatum(databaseid));
    ScanKeyInit(&keys[1],
                Anum_pg_db_role_setting_setrole,
                BTEqualStrategyNumber,
                F_OIDEQ,
                ObjectIdGetDatum(roleid));
 
    scan = systable_beginscan(relsetting, DbRoleSettingDatidRolidIndexId, true,
                              snapshot, 2, keys);
    while (HeapTupleIsValid(tup = systable_getnext(scan)))
    {
        bool        isnull;
        Datum       datum;
 
        datum = heap_getattr(tup, Anum_pg_db_role_setting_setconfig,
                             RelationGetDescr(relsetting), &isnull);
        if (!isnull)
        {
            ArrayType  *a = DatumGetArrayTypeP(datum);
 
            /*
             * We process all the options at SUSET level.  We assume that the
             * right to insert an option into pg_db_role_setting was checked
             * when it was inserted.
             */
            ProcessGUCArray(a, PGC_SUSET, source, GUC_ACTION_SET);
        }
    }
 
    systable_endscan(scan);
}

References a, BTEqualStrategyNumber, DatumGetArrayTypeP, GUC_ACTION_SET, heap_getattr(), HeapTupleIsValid, ObjectIdGetDatum(), PGC_SUSET, ProcessGUCArray(), RelationGetDescr, ScanKeyInit(), source, systable_beginscan(), systable_endscan(), and systable_getnext().

Referenced by process_settings().

DropSetting()

void DropSetting	(	Oid	databaseid,
		Oid	roleid
	)

Definition at line 179 of file pg_db_role_setting.c.

{
    Relation    relsetting;
    TableScanDesc scan;
    ScanKeyData keys[2];
    HeapTuple   tup;
    int         numkeys = 0;
 
    relsetting = table_open(DbRoleSettingRelationId, RowExclusiveLock);
 
    if (OidIsValid(databaseid))
    {
        ScanKeyInit(&keys[numkeys],
                    Anum_pg_db_role_setting_setdatabase,
                    BTEqualStrategyNumber,
                    F_OIDEQ,
                    ObjectIdGetDatum(databaseid));
        numkeys++;
    }
    if (OidIsValid(roleid))
    {
        ScanKeyInit(&keys[numkeys],
                    Anum_pg_db_role_setting_setrole,
                    BTEqualStrategyNumber,
                    F_OIDEQ,
                    ObjectIdGetDatum(roleid));
        numkeys++;
    }
 
    scan = table_beginscan_catalog(relsetting, numkeys, keys);
    while (HeapTupleIsValid(tup = heap_getnext(scan, ForwardScanDirection)))
    {
        CatalogTupleDelete(relsetting, &tup->t_self);
    }
    table_endscan(scan);
 
    table_close(relsetting, RowExclusiveLock);
}

References BTEqualStrategyNumber, CatalogTupleDelete(), ForwardScanDirection, heap_getnext(), HeapTupleIsValid, ObjectIdGetDatum(), OidIsValid, RowExclusiveLock, ScanKeyInit(), HeapTupleData::t_self, table_beginscan_catalog(), table_close(), table_endscan(), and table_open().

Referenced by dropdb(), and DropRole().