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rewriteDefine.h File Reference
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Macros

#define RULE_FIRES_ON_ORIGIN   'O'
 
#define RULE_FIRES_ALWAYS   'A'
 
#define RULE_FIRES_ON_REPLICA   'R'
 
#define RULE_DISABLED   'D'
 

Functions

ObjectAddress DefineRule (RuleStmt *stmt, const char *queryString)
 
ObjectAddress DefineQueryRewrite (const char *rulename, Oid event_relid, Node *event_qual, CmdType event_type, bool is_instead, bool replace, List *action)
 
ObjectAddress RenameRewriteRule (RangeVar *relation, const char *oldName, const char *newName)
 
void setRuleCheckAsUser (Node *node, Oid userid)
 
void EnableDisableRule (Relation rel, const char *rulename, char fires_when)
 

Macro Definition Documentation

◆ RULE_DISABLED

#define RULE_DISABLED   'D'

Definition at line 24 of file rewriteDefine.h.

Referenced by ATExecCmd(), and matchLocks().

◆ RULE_FIRES_ALWAYS

#define RULE_FIRES_ALWAYS   'A'

Definition at line 22 of file rewriteDefine.h.

Referenced by ATExecCmd().

◆ RULE_FIRES_ON_ORIGIN

#define RULE_FIRES_ON_ORIGIN   'O'

Definition at line 21 of file rewriteDefine.h.

Referenced by ATExecCmd(), InsertRule(), and matchLocks().

◆ RULE_FIRES_ON_REPLICA

#define RULE_FIRES_ON_REPLICA   'R'

Definition at line 23 of file rewriteDefine.h.

Referenced by ATExecCmd(), and matchLocks().

Function Documentation

◆ DefineQueryRewrite()

ObjectAddress DefineQueryRewrite ( const char *  rulename,
Oid  event_relid,
Node event_qual,
CmdType  event_type,
bool  is_instead,
bool  replace,
List action 
)

Definition at line 233 of file rewriteDefine.c.

References AccessExclusiveLock, aclcheck_error(), ACLCHECK_NOT_OWNER, allowSystemTableMods, Assert, CatalogTupleUpdate(), checkRuleResultList(), ObjectAddress::classId, CMD_SELECT, CommandCounterIncrement(), Query::commandType, deleteDependencyRecordsFor(), DeleteSystemAttributeTuples(), DROP_RESTRICT, elog, ereport, errcode(), errhint(), errmsg(), ERROR, RewriteRule::event, ExecDropSingleTupleTableSlot(), ForwardScanDirection, get_relkind_objtype(), getInsertSelectQuery(), GetLatestSnapshot(), GETSTRUCT, GetUserId(), has_superclass(), Query::hasModifyingCTE, heap_freetuple(), HeapTupleIsValid, i, InsertRule(), InvalidMultiXactId, InvalidOid, InvalidTransactionId, IsSystemRelation(), lfirst_node, linitial_node, list_length(), NAMEDATALEN, NIL, NoLock, RuleLock::numLocks, ObjectAddressSet, ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, OidIsValid, PERFORM_DELETION_INTERNAL, performDeletion(), pg_class_ownercheck(), PRS2_NEW_VARNO, PRS2_OLD_VARNO, pstrdup(), RelationData::rd_rel, RelationData::rd_rules, RegisterSnapshot(), relation_has_policies(), RelationDropStorage(), RelationGetDescr, RelationGetRelationName, RelationGetRelid, RELOID, Query::resultRelation, Query::returningList, RowExclusiveLock, RuleLock::rules, SearchSysCacheCopy1, SetRelationRuleStatus(), HeapTupleData::t_self, table_beginscan(), table_close(), table_endscan(), table_open(), table_scan_getnextslot(), table_slot_create(), Query::targetList, UnregisterSnapshot(), and ViewSelectRuleName.

Referenced by DefineRule(), and DefineViewRules().

240 {
241  Relation event_relation;
242  ListCell *l;
243  Query *query;
244  bool RelisBecomingView = false;
245  Oid ruleId = InvalidOid;
246  ObjectAddress address;
247 
248  /*
249  * If we are installing an ON SELECT rule, we had better grab
250  * AccessExclusiveLock to ensure no SELECTs are currently running on the
251  * event relation. For other types of rules, it would be sufficient to
252  * grab ShareRowExclusiveLock to lock out insert/update/delete actions and
253  * to ensure that we lock out current CREATE RULE statements; but because
254  * of race conditions in access to catalog entries, we can't do that yet.
255  *
256  * Note that this lock level should match the one used in DefineRule.
257  */
258  event_relation = table_open(event_relid, AccessExclusiveLock);
259 
260  /*
261  * Verify relation is of a type that rules can sensibly be applied to.
262  * Internal callers can target materialized views, but transformRuleStmt()
263  * blocks them for users. Don't mention them in the error message.
264  */
265  if (event_relation->rd_rel->relkind != RELKIND_RELATION &&
266  event_relation->rd_rel->relkind != RELKIND_MATVIEW &&
267  event_relation->rd_rel->relkind != RELKIND_VIEW &&
268  event_relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
269  ereport(ERROR,
270  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
271  errmsg("\"%s\" is not a table or view",
272  RelationGetRelationName(event_relation))));
273 
274  if (!allowSystemTableMods && IsSystemRelation(event_relation))
275  ereport(ERROR,
276  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
277  errmsg("permission denied: \"%s\" is a system catalog",
278  RelationGetRelationName(event_relation))));
279 
280  /*
281  * Check user has permission to apply rules to this relation.
282  */
283  if (!pg_class_ownercheck(event_relid, GetUserId()))
284  aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(event_relation->rd_rel->relkind),
285  RelationGetRelationName(event_relation));
286 
287  /*
288  * No rule actions that modify OLD or NEW
289  */
290  foreach(l, action)
291  {
292  query = lfirst_node(Query, l);
293  if (query->resultRelation == 0)
294  continue;
295  /* Don't be fooled by INSERT/SELECT */
296  if (query != getInsertSelectQuery(query, NULL))
297  continue;
298  if (query->resultRelation == PRS2_OLD_VARNO)
299  ereport(ERROR,
300  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
301  errmsg("rule actions on OLD are not implemented"),
302  errhint("Use views or triggers instead.")));
303  if (query->resultRelation == PRS2_NEW_VARNO)
304  ereport(ERROR,
305  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
306  errmsg("rule actions on NEW are not implemented"),
307  errhint("Use triggers instead.")));
308  }
309 
310  if (event_type == CMD_SELECT)
311  {
312  /*
313  * Rules ON SELECT are restricted to view definitions
314  *
315  * So there cannot be INSTEAD NOTHING, ...
316  */
317  if (list_length(action) == 0)
318  ereport(ERROR,
319  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
320  errmsg("INSTEAD NOTHING rules on SELECT are not implemented"),
321  errhint("Use views instead.")));
322 
323  /*
324  * ... there cannot be multiple actions, ...
325  */
326  if (list_length(action) > 1)
327  ereport(ERROR,
328  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
329  errmsg("multiple actions for rules on SELECT are not implemented")));
330 
331  /*
332  * ... the one action must be a SELECT, ...
333  */
334  query = linitial_node(Query, action);
335  if (!is_instead ||
336  query->commandType != CMD_SELECT)
337  ereport(ERROR,
338  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
339  errmsg("rules on SELECT must have action INSTEAD SELECT")));
340 
341  /*
342  * ... it cannot contain data-modifying WITH ...
343  */
344  if (query->hasModifyingCTE)
345  ereport(ERROR,
346  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
347  errmsg("rules on SELECT must not contain data-modifying statements in WITH")));
348 
349  /*
350  * ... there can be no rule qual, ...
351  */
352  if (event_qual != NULL)
353  ereport(ERROR,
354  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
355  errmsg("event qualifications are not implemented for rules on SELECT")));
356 
357  /*
358  * ... the targetlist of the SELECT action must exactly match the
359  * event relation, ...
360  */
362  RelationGetDescr(event_relation),
363  true,
364  event_relation->rd_rel->relkind !=
365  RELKIND_MATVIEW);
366 
367  /*
368  * ... there must not be another ON SELECT rule already ...
369  */
370  if (!replace && event_relation->rd_rules != NULL)
371  {
372  int i;
373 
374  for (i = 0; i < event_relation->rd_rules->numLocks; i++)
375  {
376  RewriteRule *rule;
377 
378  rule = event_relation->rd_rules->rules[i];
379  if (rule->event == CMD_SELECT)
380  ereport(ERROR,
381  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
382  errmsg("\"%s\" is already a view",
383  RelationGetRelationName(event_relation))));
384  }
385  }
386 
387  /*
388  * ... and finally the rule must be named _RETURN.
389  */
390  if (strcmp(rulename, ViewSelectRuleName) != 0)
391  {
392  /*
393  * In versions before 7.3, the expected name was _RETviewname. For
394  * backwards compatibility with old pg_dump output, accept that
395  * and silently change it to _RETURN. Since this is just a quick
396  * backwards-compatibility hack, limit the number of characters
397  * checked to a few less than NAMEDATALEN; this saves having to
398  * worry about where a multibyte character might have gotten
399  * truncated.
400  */
401  if (strncmp(rulename, "_RET", 4) != 0 ||
402  strncmp(rulename + 4, RelationGetRelationName(event_relation),
403  NAMEDATALEN - 4 - 4) != 0)
404  ereport(ERROR,
405  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
406  errmsg("view rule for \"%s\" must be named \"%s\"",
407  RelationGetRelationName(event_relation),
409  rulename = pstrdup(ViewSelectRuleName);
410  }
411 
412  /*
413  * Are we converting a relation to a view?
414  *
415  * If so, check that the relation is empty because the storage for the
416  * relation is going to be deleted. Also insist that the rel not be
417  * involved in partitioning, nor have any triggers, indexes, child or
418  * parent tables, RLS policies, or RLS enabled. (Note: some of these
419  * tests are too strict, because they will reject relations that once
420  * had such but don't anymore. But we don't really care, because this
421  * whole business of converting relations to views is just an obsolete
422  * kluge to allow dump/reload of views that participate in circular
423  * dependencies.)
424  */
425  if (event_relation->rd_rel->relkind != RELKIND_VIEW &&
426  event_relation->rd_rel->relkind != RELKIND_MATVIEW)
427  {
428  TableScanDesc scanDesc;
429  Snapshot snapshot;
430  TupleTableSlot *slot;
431 
432  if (event_relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
433  ereport(ERROR,
434  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
435  errmsg("cannot convert partitioned table \"%s\" to a view",
436  RelationGetRelationName(event_relation))));
437 
438  /* only case left: */
439  Assert(event_relation->rd_rel->relkind == RELKIND_RELATION);
440 
441  if (event_relation->rd_rel->relispartition)
442  ereport(ERROR,
443  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
444  errmsg("cannot convert partition \"%s\" to a view",
445  RelationGetRelationName(event_relation))));
446 
447  snapshot = RegisterSnapshot(GetLatestSnapshot());
448  scanDesc = table_beginscan(event_relation, snapshot, 0, NULL);
449  slot = table_slot_create(event_relation, NULL);
450  if (table_scan_getnextslot(scanDesc, ForwardScanDirection, slot))
451  ereport(ERROR,
452  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
453  errmsg("could not convert table \"%s\" to a view because it is not empty",
454  RelationGetRelationName(event_relation))));
456  table_endscan(scanDesc);
457  UnregisterSnapshot(snapshot);
458 
459  if (event_relation->rd_rel->relhastriggers)
460  ereport(ERROR,
461  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
462  errmsg("could not convert table \"%s\" to a view because it has triggers",
463  RelationGetRelationName(event_relation)),
464  errhint("In particular, the table cannot be involved in any foreign key relationships.")));
465 
466  if (event_relation->rd_rel->relhasindex)
467  ereport(ERROR,
468  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
469  errmsg("could not convert table \"%s\" to a view because it has indexes",
470  RelationGetRelationName(event_relation))));
471 
472  if (event_relation->rd_rel->relhassubclass)
473  ereport(ERROR,
474  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
475  errmsg("could not convert table \"%s\" to a view because it has child tables",
476  RelationGetRelationName(event_relation))));
477 
478  if (has_superclass(RelationGetRelid(event_relation)))
479  ereport(ERROR,
480  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
481  errmsg("could not convert table \"%s\" to a view because it has parent tables",
482  RelationGetRelationName(event_relation))));
483 
484  if (event_relation->rd_rel->relrowsecurity)
485  ereport(ERROR,
486  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
487  errmsg("could not convert table \"%s\" to a view because it has row security enabled",
488  RelationGetRelationName(event_relation))));
489 
490  if (relation_has_policies(event_relation))
491  ereport(ERROR,
492  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
493  errmsg("could not convert table \"%s\" to a view because it has row security policies",
494  RelationGetRelationName(event_relation))));
495 
496  RelisBecomingView = true;
497  }
498  }
499  else
500  {
501  /*
502  * For non-SELECT rules, a RETURNING list can appear in at most one of
503  * the actions ... and there can't be any RETURNING list at all in a
504  * conditional or non-INSTEAD rule. (Actually, there can be at most
505  * one RETURNING list across all rules on the same event, but it seems
506  * best to enforce that at rule expansion time.) If there is a
507  * RETURNING list, it must match the event relation.
508  */
509  bool haveReturning = false;
510 
511  foreach(l, action)
512  {
513  query = lfirst_node(Query, l);
514 
515  if (!query->returningList)
516  continue;
517  if (haveReturning)
518  ereport(ERROR,
519  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
520  errmsg("cannot have multiple RETURNING lists in a rule")));
521  haveReturning = true;
522  if (event_qual != NULL)
523  ereport(ERROR,
524  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
525  errmsg("RETURNING lists are not supported in conditional rules")));
526  if (!is_instead)
527  ereport(ERROR,
528  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
529  errmsg("RETURNING lists are not supported in non-INSTEAD rules")));
531  RelationGetDescr(event_relation),
532  false, false);
533  }
534  }
535 
536  /*
537  * This rule is allowed - prepare to install it.
538  */
539 
540  /* discard rule if it's null action and not INSTEAD; it's a no-op */
541  if (action != NIL || is_instead)
542  {
543  ruleId = InsertRule(rulename,
544  event_type,
545  event_relid,
546  is_instead,
547  event_qual,
548  action,
549  replace);
550 
551  /*
552  * Set pg_class 'relhasrules' field true for event relation.
553  *
554  * Important side effect: an SI notice is broadcast to force all
555  * backends (including me!) to update relcache entries with the new
556  * rule.
557  */
558  SetRelationRuleStatus(event_relid, true);
559  }
560 
561  /* ---------------------------------------------------------------------
562  * If the relation is becoming a view:
563  * - delete the associated storage files
564  * - get rid of any system attributes in pg_attribute; a view shouldn't
565  * have any of those
566  * - remove the toast table; there is no need for it anymore, and its
567  * presence would make vacuum slightly more complicated
568  * - set relkind to RELKIND_VIEW, and adjust other pg_class fields
569  * to be appropriate for a view
570  *
571  * NB: we had better have AccessExclusiveLock to do this ...
572  * ---------------------------------------------------------------------
573  */
574  if (RelisBecomingView)
575  {
576  Relation relationRelation;
577  Oid toastrelid;
578  HeapTuple classTup;
579  Form_pg_class classForm;
580 
581  relationRelation = table_open(RelationRelationId, RowExclusiveLock);
582  toastrelid = event_relation->rd_rel->reltoastrelid;
583 
584  /* drop storage while table still looks like a table */
585  RelationDropStorage(event_relation);
586  DeleteSystemAttributeTuples(event_relid);
587 
588  /*
589  * Drop the toast table if any. (This won't take care of updating the
590  * toast fields in the relation's own pg_class entry; we handle that
591  * below.)
592  */
593  if (OidIsValid(toastrelid))
594  {
595  ObjectAddress toastobject;
596 
597  /*
598  * Delete the dependency of the toast relation on the main
599  * relation so we can drop the former without dropping the latter.
600  */
601  deleteDependencyRecordsFor(RelationRelationId, toastrelid,
602  false);
603 
604  /* Make deletion of dependency record visible */
606 
607  /* Now drop toast table, including its index */
608  toastobject.classId = RelationRelationId;
609  toastobject.objectId = toastrelid;
610  toastobject.objectSubId = 0;
611  performDeletion(&toastobject, DROP_RESTRICT,
613  }
614 
615  /*
616  * SetRelationRuleStatus may have updated the pg_class row, so we must
617  * advance the command counter before trying to update it again.
618  */
620 
621  /*
622  * Fix pg_class entry to look like a normal view's, including setting
623  * the correct relkind and removal of reltoastrelid of the toast table
624  * we potentially removed above.
625  */
626  classTup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(event_relid));
627  if (!HeapTupleIsValid(classTup))
628  elog(ERROR, "cache lookup failed for relation %u", event_relid);
629  classForm = (Form_pg_class) GETSTRUCT(classTup);
630 
631  classForm->relam = InvalidOid;
632  classForm->reltablespace = InvalidOid;
633  classForm->relpages = 0;
634  classForm->reltuples = -1;
635  classForm->relallvisible = 0;
636  classForm->reltoastrelid = InvalidOid;
637  classForm->relhasindex = false;
638  classForm->relkind = RELKIND_VIEW;
639  classForm->relfrozenxid = InvalidTransactionId;
640  classForm->relminmxid = InvalidMultiXactId;
641  classForm->relreplident = REPLICA_IDENTITY_NOTHING;
642 
643  CatalogTupleUpdate(relationRelation, &classTup->t_self, classTup);
644 
645  heap_freetuple(classTup);
646  table_close(relationRelation, RowExclusiveLock);
647  }
648 
649  ObjectAddressSet(address, RewriteRelationId, ruleId);
650 
651  /* Close rel, but keep lock till commit... */
652  table_close(event_relation, NoLock);
653 
654  return address;
655 }
TupleTableSlot * table_slot_create(Relation relation, List **reglist)
Definition: tableam.c:91
#define NIL
Definition: pg_list.h:65
Query * getInsertSelectQuery(Query *parsetree, Query ***subquery_ptr)
Definition: rewriteManip.c:924
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
int errhint(const char *fmt,...)
Definition: elog.c:1156
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
int numLocks
Definition: prs2lock.h:42
bool IsSystemRelation(Relation relation)
Definition: catalog.c:73
Snapshot RegisterSnapshot(Snapshot snapshot)
Definition: snapmgr.c:810
#define RelationGetDescr(relation)
Definition: rel.h:495
Oid GetUserId(void)
Definition: miscinit.c:478
char * pstrdup(const char *in)
Definition: mcxt.c:1299
int resultRelation
Definition: parsenodes.h:130
long deleteDependencyRecordsFor(Oid classId, Oid objectId, bool skipExtensionDeps)
Definition: pg_depend.c:232
int errcode(int sqlerrcode)
Definition: elog.c:698
static void checkRuleResultList(List *targetList, TupleDesc resultDesc, bool isSelect, bool requireColumnNameMatch)
#define ViewSelectRuleName
static bool table_scan_getnextslot(TableScanDesc sscan, ScanDirection direction, TupleTableSlot *slot)
Definition: tableam.h:1032
Form_pg_class rd_rel
Definition: rel.h:109
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1338
unsigned int Oid
Definition: postgres_ext.h:31
#define linitial_node(type, l)
Definition: pg_list.h:177
#define OidIsValid(objectId)
Definition: c.h:710
void SetRelationRuleStatus(Oid relationId, bool relHasRules)
Definition: localtime.c:72
List * targetList
Definition: parsenodes.h:150
#define NAMEDATALEN
void aclcheck_error(AclResult aclerr, ObjectType objtype, const char *objectname)
Definition: aclchk.c:3313
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
static TableScanDesc table_beginscan(Relation rel, Snapshot snapshot, int nkeys, struct ScanKeyData *key)
Definition: tableam.h:883
ItemPointerData t_self
Definition: htup.h:65
bool has_superclass(Oid relationId)
Definition: pg_inherits.c:378
#define lfirst_node(type, lc)
Definition: pg_list.h:172
#define NoLock
Definition: lockdefs.h:34
void ExecDropSingleTupleTableSlot(TupleTableSlot *slot)
Definition: execTuples.c:1254
#define RowExclusiveLock
Definition: lockdefs.h:38
CmdType event
Definition: prs2lock.h:27
void performDeletion(const ObjectAddress *object, DropBehavior behavior, int flags)
Definition: dependency.c:312
#define InvalidTransactionId
Definition: transam.h:31
#define RelationGetRelationName(relation)
Definition: rel.h:503
RewriteRule ** rules
Definition: prs2lock.h:43
List * returningList
Definition: parsenodes.h:156
void UnregisterSnapshot(Snapshot snapshot)
Definition: snapmgr.c:852
#define PRS2_OLD_VARNO
Definition: primnodes.h:183
void RelationDropStorage(Relation rel)
Definition: storage.c:195
void CommandCounterIncrement(void)
Definition: xact.c:1021
#define InvalidMultiXactId
Definition: multixact.h:24
bool allowSystemTableMods
Definition: globals.c:123
#define InvalidOid
Definition: postgres_ext.h:36
#define ereport(elevel,...)
Definition: elog.h:157
CmdType commandType
Definition: parsenodes.h:120
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define Assert(condition)
Definition: c.h:804
bool pg_class_ownercheck(Oid class_oid, Oid roleid)
Definition: aclchk.c:4823
RuleLock * rd_rules
Definition: rel.h:113
void CatalogTupleUpdate(Relation heapRel, ItemPointer otid, HeapTuple tup)
Definition: indexing.c:301
static int list_length(const List *l)
Definition: pg_list.h:149
Snapshot GetLatestSnapshot(void)
Definition: snapmgr.c:325
#define ObjectAddressSet(addr, class_id, object_id)
Definition: objectaddress.h:40
static void table_endscan(TableScanDesc scan)
Definition: tableam.h:991
FormData_pg_class * Form_pg_class
Definition: pg_class.h:153
#define SearchSysCacheCopy1(cacheId, key1)
Definition: syscache.h:175
#define AccessExclusiveLock
Definition: lockdefs.h:45
bool relation_has_policies(Relation rel)
Definition: policy.c:1359
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define elog(elevel,...)
Definition: elog.h:232
static Oid InsertRule(const char *rulname, int evtype, Oid eventrel_oid, bool evinstead, Node *event_qual, List *action, bool replace)
Definition: rewriteDefine.c:59
void DeleteSystemAttributeTuples(Oid relid)
Definition: heap.c:1621
int i
ObjectType get_relkind_objtype(char relkind)
bool hasModifyingCTE
Definition: parsenodes.h:139
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
#define RelationGetRelid(relation)
Definition: rel.h:469
#define PRS2_NEW_VARNO
Definition: primnodes.h:184
#define PERFORM_DELETION_INTERNAL
Definition: dependency.h:141

◆ DefineRule()

ObjectAddress DefineRule ( RuleStmt stmt,
const char *  queryString 
)

Definition at line 199 of file rewriteDefine.c.

References AccessExclusiveLock, DefineQueryRewrite(), RuleStmt::event, RuleStmt::instead, RangeVarGetRelid, RuleStmt::relation, RuleStmt::replace, RuleStmt::rulename, and transformRuleStmt().

Referenced by ProcessUtilitySlow().

200 {
201  List *actions;
202  Node *whereClause;
203  Oid relId;
204 
205  /* Parse analysis. */
206  transformRuleStmt(stmt, queryString, &actions, &whereClause);
207 
208  /*
209  * Find and lock the relation. Lock level should match
210  * DefineQueryRewrite.
211  */
212  relId = RangeVarGetRelid(stmt->relation, AccessExclusiveLock, false);
213 
214  /* ... and execute */
215  return DefineQueryRewrite(stmt->rulename,
216  relId,
217  whereClause,
218  stmt->event,
219  stmt->instead,
220  stmt->replace,
221  actions);
222 }
#define RangeVarGetRelid(relation, lockmode, missing_ok)
Definition: namespace.h:78
Definition: nodes.h:539
unsigned int Oid
Definition: postgres_ext.h:31
bool instead
Definition: parsenodes.h:3108
bool replace
Definition: parsenodes.h:3110
char * rulename
Definition: parsenodes.h:3105
CmdType event
Definition: parsenodes.h:3107
#define AccessExclusiveLock
Definition: lockdefs.h:45
RangeVar * relation
Definition: parsenodes.h:3104
Definition: pg_list.h:50
ObjectAddress DefineQueryRewrite(const char *rulename, Oid event_relid, Node *event_qual, CmdType event_type, bool is_instead, bool replace, List *action)
void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause)

◆ EnableDisableRule()

void EnableDisableRule ( Relation  rel,
const char *  rulename,
char  fires_when 
)

Definition at line 856 of file rewriteDefine.c.

References aclcheck_error(), ACLCHECK_NOT_OWNER, Assert, CacheInvalidateRelcache(), CatalogTupleUpdate(), CharGetDatum, DatumGetChar, ereport, errcode(), errmsg(), ERROR, get_rel_name(), get_rel_relkind(), get_relkind_objtype(), GETSTRUCT, GetUserId(), heap_freetuple(), HeapTupleIsValid, InvokeObjectPostAlterHook, ObjectIdGetDatum, pg_class_ownercheck(), PointerGetDatum, RelationGetRelid, RowExclusiveLock, RULERELNAME, SearchSysCacheCopy2, HeapTupleData::t_self, table_close(), and table_open().

Referenced by ATExecEnableDisableRule().

858 {
859  Relation pg_rewrite_desc;
860  Oid owningRel = RelationGetRelid(rel);
861  Oid eventRelationOid;
862  HeapTuple ruletup;
863  Form_pg_rewrite ruleform;
864  bool changed = false;
865 
866  /*
867  * Find the rule tuple to change.
868  */
869  pg_rewrite_desc = table_open(RewriteRelationId, RowExclusiveLock);
871  ObjectIdGetDatum(owningRel),
872  PointerGetDatum(rulename));
873  if (!HeapTupleIsValid(ruletup))
874  ereport(ERROR,
875  (errcode(ERRCODE_UNDEFINED_OBJECT),
876  errmsg("rule \"%s\" for relation \"%s\" does not exist",
877  rulename, get_rel_name(owningRel))));
878 
879  ruleform = (Form_pg_rewrite) GETSTRUCT(ruletup);
880 
881  /*
882  * Verify that the user has appropriate permissions.
883  */
884  eventRelationOid = ruleform->ev_class;
885  Assert(eventRelationOid == owningRel);
886  if (!pg_class_ownercheck(eventRelationOid, GetUserId()))
888  get_rel_name(eventRelationOid));
889 
890  /*
891  * Change ev_enabled if it is different from the desired new state.
892  */
893  if (DatumGetChar(ruleform->ev_enabled) !=
894  fires_when)
895  {
896  ruleform->ev_enabled = CharGetDatum(fires_when);
897  CatalogTupleUpdate(pg_rewrite_desc, &ruletup->t_self, ruletup);
898 
899  changed = true;
900  }
901 
902  InvokeObjectPostAlterHook(RewriteRelationId, ruleform->oid, 0);
903 
904  heap_freetuple(ruletup);
905  table_close(pg_rewrite_desc, RowExclusiveLock);
906 
907  /*
908  * If we changed anything, broadcast a SI inval message to force each
909  * backend (including our own!) to rebuild relation's relcache entry.
910  * Otherwise they will fail to apply the change promptly.
911  */
912  if (changed)
914 }
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
Oid GetUserId(void)
Definition: miscinit.c:478
#define PointerGetDatum(X)
Definition: postgres.h:600
char get_rel_relkind(Oid relid)
Definition: lsyscache.c:1974
int errcode(int sqlerrcode)
Definition: elog.c:698
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1338
unsigned int Oid
Definition: postgres_ext.h:31
void aclcheck_error(AclResult aclerr, ObjectType objtype, const char *objectname)
Definition: aclchk.c:3313
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
ItemPointerData t_self
Definition: htup.h:65
#define RowExclusiveLock
Definition: lockdefs.h:38
#define InvokeObjectPostAlterHook(classId, objectId, subId)
Definition: objectaccess.h:175
#define DatumGetChar(X)
Definition: postgres.h:453
#define ereport(elevel,...)
Definition: elog.h:157
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define Assert(condition)
Definition: c.h:804
bool pg_class_ownercheck(Oid class_oid, Oid roleid)
Definition: aclchk.c:4823
void CatalogTupleUpdate(Relation heapRel, ItemPointer otid, HeapTuple tup)
Definition: indexing.c:301
#define CharGetDatum(X)
Definition: postgres.h:460
FormData_pg_rewrite * Form_pg_rewrite
Definition: pg_rewrite.h:52
void CacheInvalidateRelcache(Relation relation)
Definition: inval.c:1279
int errmsg(const char *fmt,...)
Definition: elog.c:909
ObjectType get_relkind_objtype(char relkind)
#define SearchSysCacheCopy2(cacheId, key1, key2)
Definition: syscache.h:177
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
char * get_rel_name(Oid relid)
Definition: lsyscache.c:1899
#define RelationGetRelid(relation)
Definition: rel.h:469

◆ RenameRewriteRule()

ObjectAddress RenameRewriteRule ( RangeVar relation,
const char *  oldName,
const char *  newName 
)

Definition at line 957 of file rewriteDefine.c.

References AccessExclusiveLock, CacheInvalidateRelcache(), CatalogTupleUpdate(), CMD_SELECT, ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errmsg(), ERROR, GETSTRUCT, heap_freetuple(), HeapTupleIsValid, InvokeObjectPostAlterHook, IsDefinedRewriteRule(), namestrcpy(), NoLock, ObjectAddressSet, ObjectIdGetDatum, PointerGetDatum, RangeVarCallbackForRenameRule(), RangeVarGetRelidExtended(), relation_close(), relation_open(), RelationGetRelationName, RowExclusiveLock, RULERELNAME, SearchSysCacheCopy2, HeapTupleData::t_self, table_close(), and table_open().

Referenced by ExecRenameStmt().

959 {
960  Oid relid;
961  Relation targetrel;
962  Relation pg_rewrite_desc;
963  HeapTuple ruletup;
964  Form_pg_rewrite ruleform;
965  Oid ruleOid;
966  ObjectAddress address;
967 
968  /*
969  * Look up name, check permissions, and acquire lock (which we will NOT
970  * release until end of transaction).
971  */
973  0,
975  NULL);
976 
977  /* Have lock already, so just need to build relcache entry. */
978  targetrel = relation_open(relid, NoLock);
979 
980  /* Prepare to modify pg_rewrite */
981  pg_rewrite_desc = table_open(RewriteRelationId, RowExclusiveLock);
982 
983  /* Fetch the rule's entry (it had better exist) */
985  ObjectIdGetDatum(relid),
986  PointerGetDatum(oldName));
987  if (!HeapTupleIsValid(ruletup))
988  ereport(ERROR,
989  (errcode(ERRCODE_UNDEFINED_OBJECT),
990  errmsg("rule \"%s\" for relation \"%s\" does not exist",
991  oldName, RelationGetRelationName(targetrel))));
992  ruleform = (Form_pg_rewrite) GETSTRUCT(ruletup);
993  ruleOid = ruleform->oid;
994 
995  /* rule with the new name should not already exist */
996  if (IsDefinedRewriteRule(relid, newName))
997  ereport(ERROR,
999  errmsg("rule \"%s\" for relation \"%s\" already exists",
1000  newName, RelationGetRelationName(targetrel))));
1001 
1002  /*
1003  * We disallow renaming ON SELECT rules, because they should always be
1004  * named "_RETURN".
1005  */
1006  if (ruleform->ev_type == CMD_SELECT + '0')
1007  ereport(ERROR,
1008  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1009  errmsg("renaming an ON SELECT rule is not allowed")));
1010 
1011  /* OK, do the update */
1012  namestrcpy(&(ruleform->rulename), newName);
1013 
1014  CatalogTupleUpdate(pg_rewrite_desc, &ruletup->t_self, ruletup);
1015 
1016  InvokeObjectPostAlterHook(RewriteRelationId, ruleOid, 0);
1017 
1018  heap_freetuple(ruletup);
1019  table_close(pg_rewrite_desc, RowExclusiveLock);
1020 
1021  /*
1022  * Invalidate relation's relcache entry so that other backends (and this
1023  * one too!) are sent SI message to make them rebuild relcache entries.
1024  * (Ideally this should happen automatically...)
1025  */
1026  CacheInvalidateRelcache(targetrel);
1027 
1028  ObjectAddressSet(address, RewriteRelationId, ruleOid);
1029 
1030  /*
1031  * Close rel, but keep exclusive lock!
1032  */
1033  relation_close(targetrel, NoLock);
1034 
1035  return address;
1036 }
bool IsDefinedRewriteRule(Oid owningRel, const char *ruleName)
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
void namestrcpy(Name name, const char *str)
Definition: name.c:233
#define PointerGetDatum(X)
Definition: postgres.h:600
int errcode(int sqlerrcode)
Definition: elog.c:698
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1338
unsigned int Oid
Definition: postgres_ext.h:31
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
Relation relation_open(Oid relationId, LOCKMODE lockmode)
Definition: relation.c:48
ItemPointerData t_self
Definition: htup.h:65
#define NoLock
Definition: lockdefs.h:34
#define RowExclusiveLock
Definition: lockdefs.h:38
#define RelationGetRelationName(relation)
Definition: rel.h:503
Oid RangeVarGetRelidExtended(const RangeVar *relation, LOCKMODE lockmode, uint32 flags, RangeVarGetRelidCallback callback, void *callback_arg)
Definition: namespace.c:236
#define InvokeObjectPostAlterHook(classId, objectId, subId)
Definition: objectaccess.h:175
#define ereport(elevel,...)
Definition: elog.h:157
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
void relation_close(Relation relation, LOCKMODE lockmode)
Definition: relation.c:206
void CatalogTupleUpdate(Relation heapRel, ItemPointer otid, HeapTuple tup)
Definition: indexing.c:301
#define ObjectAddressSet(addr, class_id, object_id)
Definition: objectaddress.h:40
FormData_pg_rewrite * Form_pg_rewrite
Definition: pg_rewrite.h:52
void CacheInvalidateRelcache(Relation relation)
Definition: inval.c:1279
#define AccessExclusiveLock
Definition: lockdefs.h:45
int errmsg(const char *fmt,...)
Definition: elog.c:909
static void RangeVarCallbackForRenameRule(const RangeVar *rv, Oid relid, Oid oldrelid, void *arg)
#define SearchSysCacheCopy2(cacheId, key1, key2)
Definition: syscache.h:177
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
#define ERRCODE_DUPLICATE_OBJECT
Definition: streamutil.c:32

◆ setRuleCheckAsUser()

void setRuleCheckAsUser ( Node node,
Oid  userid 
)

Definition at line 799 of file rewriteDefine.c.

References setRuleCheckAsUser_walker().

Referenced by get_row_security_policies(), and RelationBuildRuleLock().

800 {
801  (void) setRuleCheckAsUser_walker(node, &userid);
802 }
static bool setRuleCheckAsUser_walker(Node *node, Oid *context)