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Make it possibly to specify GUC params per user and per database.
Create a new catalog pg_db_role_setting where they are now stored, and better encapsulate the code that deals with settings into its realm. The old datconfig and rolconfig columns are removed. psql has gained a \drds command to display the settings. Backwards compatibility warning: while the backwards-compatible system views still have the config columns, they no longer completely represent the configuration for a user or database. Catalog version bumped.
This commit is contained in:
Alvaro Herrera
231
src/backend/catalog/pg_db_role_setting.c
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231
src/backend/catalog/pg_db_role_setting.c
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/*
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* pg_db_role_setting.c
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* Routines to support manipulation of the pg_db_role_setting relation
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*
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* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/catalog/pg_db_role_setting.c,v 1.1 2009/10/07 22:14:18 alvherre Exp $
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*/
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#include "postgres.h"
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#include "access/genam.h"
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#include "access/heapam.h"
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#include "access/htup.h"
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#include "access/skey.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_db_role_setting.h"
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#include "utils/fmgroids.h"
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#include "utils/rel.h"
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#include "utils/tqual.h"
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void
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AlterSetting(Oid databaseid, Oid roleid, VariableSetStmt *setstmt)
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{
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char *valuestr;
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HeapTuple tuple;
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Relation rel;
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ScanKeyData scankey[2];
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SysScanDesc scan;
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valuestr = ExtractSetVariableArgs(setstmt);
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/* Get the old tuple, if any. */
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rel = heap_open(DbRoleSettingRelationId, RowExclusiveLock);
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ScanKeyInit(&scankey[0],
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Anum_pg_db_role_setting_setdatabase,
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BTEqualStrategyNumber, F_OIDEQ,
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ObjectIdGetDatum(databaseid));
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ScanKeyInit(&scankey[1],
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Anum_pg_db_role_setting_setrole,
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BTEqualStrategyNumber, F_OIDEQ,
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ObjectIdGetDatum(roleid));
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scan = systable_beginscan(rel, DbRoleSettingDatidRolidIndexId, true,
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SnapshotNow, 2, scankey);
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tuple = systable_getnext(scan);
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/*
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* There are three cases:
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*
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* - in RESET ALL, simply delete the pg_db_role_setting tuple (if any)
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*
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* - in other commands, if there's a tuple in pg_db_role_setting, update it;
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* if it ends up empty, delete it
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*
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* - otherwise, insert a new pg_db_role_setting tuple, but only if the
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* command is not RESET
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*/
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if (setstmt->kind == VAR_RESET_ALL)
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{
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if (HeapTupleIsValid(tuple))
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simple_heap_delete(rel, &tuple->t_self);
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}
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else if (HeapTupleIsValid(tuple))
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{
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Datum repl_val[Natts_pg_db_role_setting];
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bool repl_null[Natts_pg_db_role_setting];
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bool repl_repl[Natts_pg_db_role_setting];
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HeapTuple newtuple;
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Datum datum;
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bool isnull;
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ArrayType *a;
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memset(repl_repl, false, sizeof(repl_repl));
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repl_repl[Anum_pg_db_role_setting_setconfig - 1] = true;
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repl_null[Anum_pg_db_role_setting_setconfig - 1] = false;
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/* Extract old value of setconfig */
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datum = heap_getattr(tuple, Anum_pg_db_role_setting_setconfig,
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RelationGetDescr(rel), &isnull);
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a = isnull ? NULL : DatumGetArrayTypeP(datum);
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/* Update (valuestr is NULL in RESET cases) */
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if (valuestr)
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a = GUCArrayAdd(a, setstmt->name, valuestr);
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else
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a = GUCArrayDelete(a, setstmt->name);
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if (a)
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{
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repl_val[Anum_pg_db_role_setting_setconfig - 1] =
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PointerGetDatum(a);
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newtuple = heap_modify_tuple(tuple, RelationGetDescr(rel),
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repl_val, repl_null, repl_repl);
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simple_heap_update(rel, &tuple->t_self, newtuple);
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/* Update indexes */
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CatalogUpdateIndexes(rel, newtuple);
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}
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else
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simple_heap_delete(rel, &tuple->t_self);
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}
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else if (valuestr)
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{
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/* non-null valuestr means it's not RESET, so insert a new tuple */
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HeapTuple newtuple;
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Datum values[Natts_pg_db_role_setting];
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bool nulls[Natts_pg_db_role_setting];
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ArrayType *a;
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memset(nulls, false, sizeof(nulls));
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a = GUCArrayAdd(NULL, setstmt->name, valuestr);
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values[Anum_pg_db_role_setting_setdatabase - 1] =
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ObjectIdGetDatum(databaseid);
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values[Anum_pg_db_role_setting_setrole - 1] = ObjectIdGetDatum(roleid);
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values[Anum_pg_db_role_setting_setconfig - 1] = PointerGetDatum(a);
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newtuple = heap_form_tuple(RelationGetDescr(rel), values, nulls);
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simple_heap_insert(rel, newtuple);
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/* Update indexes */
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CatalogUpdateIndexes(rel, newtuple);
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}
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systable_endscan(scan);
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/* Close pg_db_role_setting, but keep lock till commit */
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heap_close(rel, NoLock);
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}
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/*
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* Drop some settings from the catalog. These can be for a particular
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* database, or for a particular role. (It is of course possible to do both
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* too, but it doesn't make sense for current uses.)
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*/
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void
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DropSetting(Oid databaseid, Oid roleid)
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{
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Relation relsetting;
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HeapScanDesc scan;
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ScanKeyData keys[2];
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HeapTuple tup;
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int numkeys = 0;
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relsetting = heap_open(DbRoleSettingRelationId, RowExclusiveLock);
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if (OidIsValid(databaseid))
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{
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ScanKeyInit(&keys[numkeys],
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Anum_pg_db_role_setting_setdatabase,
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BTEqualStrategyNumber,
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F_OIDEQ,
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ObjectIdGetDatum(databaseid));
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numkeys++;
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}
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if (OidIsValid(roleid))
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{
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ScanKeyInit(&keys[numkeys],
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Anum_pg_db_role_setting_setrole,
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BTEqualStrategyNumber,
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F_OIDEQ,
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ObjectIdGetDatum(roleid));
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numkeys++;
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}
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scan = heap_beginscan(relsetting, SnapshotNow, numkeys, keys);
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while (HeapTupleIsValid(tup = heap_getnext(scan, ForwardScanDirection)))
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{
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simple_heap_delete(relsetting, &tup->t_self);
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}
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heap_endscan(scan);
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heap_close(relsetting, RowExclusiveLock);
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}
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/*
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* Scan pg_db_role_setting looking for applicable settings, and load them on
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* the current process.
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*
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* relsetting is pg_db_role_setting, already opened and locked.
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*
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* Note: we only consider setting for the exact databaseid/roleid combination.
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* This probably needs to be called more than once, with InvalidOid passed as
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* databaseid/roleid.
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*/
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void
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ApplySetting(Oid databaseid, Oid roleid, Relation relsetting, GucSource source)
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{
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SysScanDesc scan;
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ScanKeyData keys[2];
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HeapTuple tup;
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ScanKeyInit(&keys[0],
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Anum_pg_db_role_setting_setdatabase,
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BTEqualStrategyNumber,
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F_OIDEQ,
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ObjectIdGetDatum(databaseid));
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ScanKeyInit(&keys[1],
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Anum_pg_db_role_setting_setrole,
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BTEqualStrategyNumber,
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F_OIDEQ,
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ObjectIdGetDatum(roleid));
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scan = systable_beginscan(relsetting, DbRoleSettingDatidRolidIndexId, true,
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SnapshotNow, 2, keys);
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while (HeapTupleIsValid(tup = systable_getnext(scan)))
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{
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bool isnull;
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Datum datum;
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datum = heap_getattr(tup, Anum_pg_db_role_setting_setconfig,
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RelationGetDescr(relsetting), &isnull);
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if (!isnull)
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{
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ArrayType *a = DatumGetArrayTypeP(datum);
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/*
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* We process all the options at SUSET level. We assume that the
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* right to insert an option into pg_db_role_setting was checked
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* when it was inserted.
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*/
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ProcessGUCArray(a, PGC_SUSET, source, GUC_ACTION_SET);
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}
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}
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systable_endscan(scan);
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}
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