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rewriteDefine.c
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1 /*-------------------------------------------------------------------------
2  *
3  * rewriteDefine.c
4  * routines for defining a rewrite rule
5  *
6  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/backend/rewrite/rewriteDefine.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 #include "postgres.h"
16 
17 #include "access/heapam.h"
18 #include "access/htup_details.h"
19 #include "access/multixact.h"
20 #include "access/tableam.h"
21 #include "access/transam.h"
22 #include "access/xact.h"
23 #include "catalog/catalog.h"
24 #include "catalog/dependency.h"
25 #include "catalog/heap.h"
26 #include "catalog/namespace.h"
27 #include "catalog/objectaccess.h"
28 #include "catalog/pg_inherits.h"
29 #include "catalog/pg_rewrite.h"
30 #include "catalog/storage.h"
31 #include "commands/policy.h"
32 #include "miscadmin.h"
33 #include "nodes/nodeFuncs.h"
34 #include "parser/parse_utilcmd.h"
35 #include "rewrite/rewriteDefine.h"
36 #include "rewrite/rewriteManip.h"
37 #include "rewrite/rewriteSupport.h"
38 #include "utils/acl.h"
39 #include "utils/builtins.h"
40 #include "utils/inval.h"
41 #include "utils/lsyscache.h"
42 #include "utils/rel.h"
43 #include "utils/snapmgr.h"
44 #include "utils/syscache.h"
45 
46 
47 static void checkRuleResultList(List *targetList, TupleDesc resultDesc,
48  bool isSelect, bool requireColumnNameMatch);
49 static bool setRuleCheckAsUser_walker(Node *node, Oid *context);
50 static void setRuleCheckAsUser_Query(Query *qry, Oid userid);
51 
52 
53 /*
54  * InsertRule -
55  * takes the arguments and inserts them as a row into the system
56  * relation "pg_rewrite"
57  */
58 static Oid
59 InsertRule(const char *rulname,
60  int evtype,
61  Oid eventrel_oid,
62  bool evinstead,
63  Node *event_qual,
64  List *action,
65  bool replace)
66 {
67  char *evqual = nodeToString(event_qual);
68  char *actiontree = nodeToString((Node *) action);
69  Datum values[Natts_pg_rewrite];
70  bool nulls[Natts_pg_rewrite];
71  bool replaces[Natts_pg_rewrite];
72  NameData rname;
73  Relation pg_rewrite_desc;
74  HeapTuple tup,
75  oldtup;
76  Oid rewriteObjectId;
77  ObjectAddress myself,
78  referenced;
79  bool is_update = false;
80 
81  /*
82  * Set up *nulls and *values arrays
83  */
84  MemSet(nulls, false, sizeof(nulls));
85 
86  namestrcpy(&rname, rulname);
87  values[Anum_pg_rewrite_rulename - 1] = NameGetDatum(&rname);
88  values[Anum_pg_rewrite_ev_class - 1] = ObjectIdGetDatum(eventrel_oid);
89  values[Anum_pg_rewrite_ev_type - 1] = CharGetDatum(evtype + '0');
90  values[Anum_pg_rewrite_ev_enabled - 1] = CharGetDatum(RULE_FIRES_ON_ORIGIN);
91  values[Anum_pg_rewrite_is_instead - 1] = BoolGetDatum(evinstead);
92  values[Anum_pg_rewrite_ev_qual - 1] = CStringGetTextDatum(evqual);
93  values[Anum_pg_rewrite_ev_action - 1] = CStringGetTextDatum(actiontree);
94 
95  /*
96  * Ready to store new pg_rewrite tuple
97  */
98  pg_rewrite_desc = table_open(RewriteRelationId, RowExclusiveLock);
99 
100  /*
101  * Check to see if we are replacing an existing tuple
102  */
103  oldtup = SearchSysCache2(RULERELNAME,
104  ObjectIdGetDatum(eventrel_oid),
105  PointerGetDatum(rulname));
106 
107  if (HeapTupleIsValid(oldtup))
108  {
109  if (!replace)
110  ereport(ERROR,
112  errmsg("rule \"%s\" for relation \"%s\" already exists",
113  rulname, get_rel_name(eventrel_oid))));
114 
115  /*
116  * When replacing, we don't need to replace every attribute
117  */
118  MemSet(replaces, false, sizeof(replaces));
119  replaces[Anum_pg_rewrite_ev_type - 1] = true;
120  replaces[Anum_pg_rewrite_is_instead - 1] = true;
121  replaces[Anum_pg_rewrite_ev_qual - 1] = true;
122  replaces[Anum_pg_rewrite_ev_action - 1] = true;
123 
124  tup = heap_modify_tuple(oldtup, RelationGetDescr(pg_rewrite_desc),
125  values, nulls, replaces);
126 
127  CatalogTupleUpdate(pg_rewrite_desc, &tup->t_self, tup);
128 
129  ReleaseSysCache(oldtup);
130 
131  rewriteObjectId = ((Form_pg_rewrite) GETSTRUCT(tup))->oid;
132  is_update = true;
133  }
134  else
135  {
136  rewriteObjectId = GetNewOidWithIndex(pg_rewrite_desc,
137  RewriteOidIndexId,
138  Anum_pg_rewrite_oid);
139  values[Anum_pg_rewrite_oid - 1] = ObjectIdGetDatum(rewriteObjectId);
140 
141  tup = heap_form_tuple(pg_rewrite_desc->rd_att, values, nulls);
142 
143  CatalogTupleInsert(pg_rewrite_desc, tup);
144  }
145 
146 
147  heap_freetuple(tup);
148 
149  /* If replacing, get rid of old dependencies and make new ones */
150  if (is_update)
151  deleteDependencyRecordsFor(RewriteRelationId, rewriteObjectId, false);
152 
153  /*
154  * Install dependency on rule's relation to ensure it will go away on
155  * relation deletion. If the rule is ON SELECT, make the dependency
156  * implicit --- this prevents deleting a view's SELECT rule. Other kinds
157  * of rules can be AUTO.
158  */
159  myself.classId = RewriteRelationId;
160  myself.objectId = rewriteObjectId;
161  myself.objectSubId = 0;
162 
163  referenced.classId = RelationRelationId;
164  referenced.objectId = eventrel_oid;
165  referenced.objectSubId = 0;
166 
167  recordDependencyOn(&myself, &referenced,
169 
170  /*
171  * Also install dependencies on objects referenced in action and qual.
172  */
173  recordDependencyOnExpr(&myself, (Node *) action, NIL,
175 
176  if (event_qual != NULL)
177  {
178  /* Find query containing OLD/NEW rtable entries */
179  Query *qry = linitial_node(Query, action);
180 
181  qry = getInsertSelectQuery(qry, NULL);
182  recordDependencyOnExpr(&myself, event_qual, qry->rtable,
184  }
185 
186  /* Post creation hook for new rule */
187  InvokeObjectPostCreateHook(RewriteRelationId, rewriteObjectId, 0);
188 
189  table_close(pg_rewrite_desc, RowExclusiveLock);
190 
191  return rewriteObjectId;
192 }
193 
194 /*
195  * DefineRule
196  * Execute a CREATE RULE command.
197  */
199 DefineRule(RuleStmt *stmt, const char *queryString)
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 }
223 
224 
225 /*
226  * DefineQueryRewrite
227  * Create a rule
228  *
229  * This is essentially the same as DefineRule() except that the rule's
230  * action and qual have already been passed through parse analysis.
231  */
233 DefineQueryRewrite(const char *rulename,
234  Oid event_relid,
235  Node *event_qual,
236  CmdType event_type,
237  bool is_instead,
238  bool replace,
239  List *action)
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("relation \"%s\" cannot have rules",
272  RelationGetRelationName(event_relation)),
273  errdetail_relkind_not_supported(event_relation->rd_rel->relkind)));
274 
275  if (!allowSystemTableMods && IsSystemRelation(event_relation))
276  ereport(ERROR,
277  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
278  errmsg("permission denied: \"%s\" is a system catalog",
279  RelationGetRelationName(event_relation))));
280 
281  /*
282  * Check user has permission to apply rules to this relation.
283  */
284  if (!pg_class_ownercheck(event_relid, GetUserId()))
285  aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(event_relation->rd_rel->relkind),
286  RelationGetRelationName(event_relation));
287 
288  /*
289  * No rule actions that modify OLD or NEW
290  */
291  foreach(l, action)
292  {
293  query = lfirst_node(Query, l);
294  if (query->resultRelation == 0)
295  continue;
296  /* Don't be fooled by INSERT/SELECT */
297  if (query != getInsertSelectQuery(query, NULL))
298  continue;
299  if (query->resultRelation == PRS2_OLD_VARNO)
300  ereport(ERROR,
301  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
302  errmsg("rule actions on OLD are not implemented"),
303  errhint("Use views or triggers instead.")));
304  if (query->resultRelation == PRS2_NEW_VARNO)
305  ereport(ERROR,
306  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
307  errmsg("rule actions on NEW are not implemented"),
308  errhint("Use triggers instead.")));
309  }
310 
311  if (event_type == CMD_SELECT)
312  {
313  /*
314  * Rules ON SELECT are restricted to view definitions
315  *
316  * So there cannot be INSTEAD NOTHING, ...
317  */
318  if (list_length(action) == 0)
319  ereport(ERROR,
320  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
321  errmsg("INSTEAD NOTHING rules on SELECT are not implemented"),
322  errhint("Use views instead.")));
323 
324  /*
325  * ... there cannot be multiple actions, ...
326  */
327  if (list_length(action) > 1)
328  ereport(ERROR,
329  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
330  errmsg("multiple actions for rules on SELECT are not implemented")));
331 
332  /*
333  * ... the one action must be a SELECT, ...
334  */
335  query = linitial_node(Query, action);
336  if (!is_instead ||
337  query->commandType != CMD_SELECT)
338  ereport(ERROR,
339  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
340  errmsg("rules on SELECT must have action INSTEAD SELECT")));
341 
342  /*
343  * ... it cannot contain data-modifying WITH ...
344  */
345  if (query->hasModifyingCTE)
346  ereport(ERROR,
347  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
348  errmsg("rules on SELECT must not contain data-modifying statements in WITH")));
349 
350  /*
351  * ... there can be no rule qual, ...
352  */
353  if (event_qual != NULL)
354  ereport(ERROR,
355  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
356  errmsg("event qualifications are not implemented for rules on SELECT")));
357 
358  /*
359  * ... the targetlist of the SELECT action must exactly match the
360  * event relation, ...
361  */
363  RelationGetDescr(event_relation),
364  true,
365  event_relation->rd_rel->relkind !=
366  RELKIND_MATVIEW);
367 
368  /*
369  * ... there must not be another ON SELECT rule already ...
370  */
371  if (!replace && event_relation->rd_rules != NULL)
372  {
373  int i;
374 
375  for (i = 0; i < event_relation->rd_rules->numLocks; i++)
376  {
377  RewriteRule *rule;
378 
379  rule = event_relation->rd_rules->rules[i];
380  if (rule->event == CMD_SELECT)
381  ereport(ERROR,
382  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
383  errmsg("\"%s\" is already a view",
384  RelationGetRelationName(event_relation))));
385  }
386  }
387 
388  /*
389  * ... and finally the rule must be named _RETURN.
390  */
391  if (strcmp(rulename, ViewSelectRuleName) != 0)
392  {
393  /*
394  * In versions before 7.3, the expected name was _RETviewname. For
395  * backwards compatibility with old pg_dump output, accept that
396  * and silently change it to _RETURN. Since this is just a quick
397  * backwards-compatibility hack, limit the number of characters
398  * checked to a few less than NAMEDATALEN; this saves having to
399  * worry about where a multibyte character might have gotten
400  * truncated.
401  */
402  if (strncmp(rulename, "_RET", 4) != 0 ||
403  strncmp(rulename + 4, RelationGetRelationName(event_relation),
404  NAMEDATALEN - 4 - 4) != 0)
405  ereport(ERROR,
406  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
407  errmsg("view rule for \"%s\" must be named \"%s\"",
408  RelationGetRelationName(event_relation),
410  rulename = pstrdup(ViewSelectRuleName);
411  }
412 
413  /*
414  * Are we converting a relation to a view?
415  *
416  * If so, check that the relation is empty because the storage for the
417  * relation is going to be deleted. Also insist that the rel not be
418  * involved in partitioning, nor have any triggers, indexes, child or
419  * parent tables, RLS policies, or RLS enabled. (Note: some of these
420  * tests are too strict, because they will reject relations that once
421  * had such but don't anymore. But we don't really care, because this
422  * whole business of converting relations to views is just an obsolete
423  * kluge to allow dump/reload of views that participate in circular
424  * dependencies.)
425  */
426  if (event_relation->rd_rel->relkind != RELKIND_VIEW &&
427  event_relation->rd_rel->relkind != RELKIND_MATVIEW)
428  {
429  TableScanDesc scanDesc;
430  Snapshot snapshot;
431  TupleTableSlot *slot;
432 
433  if (event_relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
434  ereport(ERROR,
435  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
436  errmsg("cannot convert partitioned table \"%s\" to a view",
437  RelationGetRelationName(event_relation))));
438 
439  /* only case left: */
440  Assert(event_relation->rd_rel->relkind == RELKIND_RELATION);
441 
442  if (event_relation->rd_rel->relispartition)
443  ereport(ERROR,
444  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
445  errmsg("cannot convert partition \"%s\" to a view",
446  RelationGetRelationName(event_relation))));
447 
448  snapshot = RegisterSnapshot(GetLatestSnapshot());
449  scanDesc = table_beginscan(event_relation, snapshot, 0, NULL);
450  slot = table_slot_create(event_relation, NULL);
451  if (table_scan_getnextslot(scanDesc, ForwardScanDirection, slot))
452  ereport(ERROR,
453  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
454  errmsg("could not convert table \"%s\" to a view because it is not empty",
455  RelationGetRelationName(event_relation))));
457  table_endscan(scanDesc);
458  UnregisterSnapshot(snapshot);
459 
460  if (event_relation->rd_rel->relhastriggers)
461  ereport(ERROR,
462  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
463  errmsg("could not convert table \"%s\" to a view because it has triggers",
464  RelationGetRelationName(event_relation)),
465  errhint("In particular, the table cannot be involved in any foreign key relationships.")));
466 
467  if (event_relation->rd_rel->relhasindex)
468  ereport(ERROR,
469  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
470  errmsg("could not convert table \"%s\" to a view because it has indexes",
471  RelationGetRelationName(event_relation))));
472 
473  if (event_relation->rd_rel->relhassubclass)
474  ereport(ERROR,
475  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
476  errmsg("could not convert table \"%s\" to a view because it has child tables",
477  RelationGetRelationName(event_relation))));
478 
479  if (has_superclass(RelationGetRelid(event_relation)))
480  ereport(ERROR,
481  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
482  errmsg("could not convert table \"%s\" to a view because it has parent tables",
483  RelationGetRelationName(event_relation))));
484 
485  if (event_relation->rd_rel->relrowsecurity)
486  ereport(ERROR,
487  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
488  errmsg("could not convert table \"%s\" to a view because it has row security enabled",
489  RelationGetRelationName(event_relation))));
490 
491  if (relation_has_policies(event_relation))
492  ereport(ERROR,
493  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
494  errmsg("could not convert table \"%s\" to a view because it has row security policies",
495  RelationGetRelationName(event_relation))));
496 
497  RelisBecomingView = true;
498  }
499  }
500  else
501  {
502  /*
503  * For non-SELECT rules, a RETURNING list can appear in at most one of
504  * the actions ... and there can't be any RETURNING list at all in a
505  * conditional or non-INSTEAD rule. (Actually, there can be at most
506  * one RETURNING list across all rules on the same event, but it seems
507  * best to enforce that at rule expansion time.) If there is a
508  * RETURNING list, it must match the event relation.
509  */
510  bool haveReturning = false;
511 
512  foreach(l, action)
513  {
514  query = lfirst_node(Query, l);
515 
516  if (!query->returningList)
517  continue;
518  if (haveReturning)
519  ereport(ERROR,
520  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
521  errmsg("cannot have multiple RETURNING lists in a rule")));
522  haveReturning = true;
523  if (event_qual != NULL)
524  ereport(ERROR,
525  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
526  errmsg("RETURNING lists are not supported in conditional rules")));
527  if (!is_instead)
528  ereport(ERROR,
529  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
530  errmsg("RETURNING lists are not supported in non-INSTEAD rules")));
532  RelationGetDescr(event_relation),
533  false, false);
534  }
535  }
536 
537  /*
538  * This rule is allowed - prepare to install it.
539  */
540 
541  /* discard rule if it's null action and not INSTEAD; it's a no-op */
542  if (action != NIL || is_instead)
543  {
544  ruleId = InsertRule(rulename,
545  event_type,
546  event_relid,
547  is_instead,
548  event_qual,
549  action,
550  replace);
551 
552  /*
553  * Set pg_class 'relhasrules' field true for event relation.
554  *
555  * Important side effect: an SI notice is broadcast to force all
556  * backends (including me!) to update relcache entries with the new
557  * rule.
558  */
559  SetRelationRuleStatus(event_relid, true);
560  }
561 
562  /* ---------------------------------------------------------------------
563  * If the relation is becoming a view:
564  * - delete the associated storage files
565  * - get rid of any system attributes in pg_attribute; a view shouldn't
566  * have any of those
567  * - remove the toast table; there is no need for it anymore, and its
568  * presence would make vacuum slightly more complicated
569  * - set relkind to RELKIND_VIEW, and adjust other pg_class fields
570  * to be appropriate for a view
571  *
572  * NB: we had better have AccessExclusiveLock to do this ...
573  * ---------------------------------------------------------------------
574  */
575  if (RelisBecomingView)
576  {
577  Relation relationRelation;
578  Oid toastrelid;
579  HeapTuple classTup;
580  Form_pg_class classForm;
581 
582  relationRelation = table_open(RelationRelationId, RowExclusiveLock);
583  toastrelid = event_relation->rd_rel->reltoastrelid;
584 
585  /* drop storage while table still looks like a table */
586  RelationDropStorage(event_relation);
587  DeleteSystemAttributeTuples(event_relid);
588 
589  /*
590  * Drop the toast table if any. (This won't take care of updating the
591  * toast fields in the relation's own pg_class entry; we handle that
592  * below.)
593  */
594  if (OidIsValid(toastrelid))
595  {
596  ObjectAddress toastobject;
597 
598  /*
599  * Delete the dependency of the toast relation on the main
600  * relation so we can drop the former without dropping the latter.
601  */
602  deleteDependencyRecordsFor(RelationRelationId, toastrelid,
603  false);
604 
605  /* Make deletion of dependency record visible */
607 
608  /* Now drop toast table, including its index */
609  toastobject.classId = RelationRelationId;
610  toastobject.objectId = toastrelid;
611  toastobject.objectSubId = 0;
612  performDeletion(&toastobject, DROP_RESTRICT,
614  }
615 
616  /*
617  * SetRelationRuleStatus may have updated the pg_class row, so we must
618  * advance the command counter before trying to update it again.
619  */
621 
622  /*
623  * Fix pg_class entry to look like a normal view's, including setting
624  * the correct relkind and removal of reltoastrelid of the toast table
625  * we potentially removed above.
626  */
627  classTup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(event_relid));
628  if (!HeapTupleIsValid(classTup))
629  elog(ERROR, "cache lookup failed for relation %u", event_relid);
630  classForm = (Form_pg_class) GETSTRUCT(classTup);
631 
632  classForm->relam = InvalidOid;
633  classForm->reltablespace = InvalidOid;
634  classForm->relpages = 0;
635  classForm->reltuples = -1;
636  classForm->relallvisible = 0;
637  classForm->reltoastrelid = InvalidOid;
638  classForm->relhasindex = false;
639  classForm->relkind = RELKIND_VIEW;
640  classForm->relfrozenxid = InvalidTransactionId;
641  classForm->relminmxid = InvalidMultiXactId;
642  classForm->relreplident = REPLICA_IDENTITY_NOTHING;
643 
644  CatalogTupleUpdate(relationRelation, &classTup->t_self, classTup);
645 
646  heap_freetuple(classTup);
647  table_close(relationRelation, RowExclusiveLock);
648  }
649 
650  ObjectAddressSet(address, RewriteRelationId, ruleId);
651 
652  /* Close rel, but keep lock till commit... */
653  table_close(event_relation, NoLock);
654 
655  return address;
656 }
657 
658 /*
659  * checkRuleResultList
660  * Verify that targetList produces output compatible with a tupledesc
661  *
662  * The targetList might be either a SELECT targetlist, or a RETURNING list;
663  * isSelect tells which. This is used for choosing error messages.
664  *
665  * A SELECT targetlist may optionally require that column names match.
666  */
667 static void
668 checkRuleResultList(List *targetList, TupleDesc resultDesc, bool isSelect,
669  bool requireColumnNameMatch)
670 {
671  ListCell *tllist;
672  int i;
673 
674  /* Only a SELECT may require a column name match. */
675  Assert(isSelect || !requireColumnNameMatch);
676 
677  i = 0;
678  foreach(tllist, targetList)
679  {
680  TargetEntry *tle = (TargetEntry *) lfirst(tllist);
681  Oid tletypid;
682  int32 tletypmod;
683  Form_pg_attribute attr;
684  char *attname;
685 
686  /* resjunk entries may be ignored */
687  if (tle->resjunk)
688  continue;
689  i++;
690  if (i > resultDesc->natts)
691  ereport(ERROR,
692  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
693  isSelect ?
694  errmsg("SELECT rule's target list has too many entries") :
695  errmsg("RETURNING list has too many entries")));
696 
697  attr = TupleDescAttr(resultDesc, i - 1);
698  attname = NameStr(attr->attname);
699 
700  /*
701  * Disallow dropped columns in the relation. This is not really
702  * expected to happen when creating an ON SELECT rule. It'd be
703  * possible if someone tried to convert a relation with dropped
704  * columns to a view, but the only case we care about supporting
705  * table-to-view conversion for is pg_dump, and pg_dump won't do that.
706  *
707  * Unfortunately, the situation is also possible when adding a rule
708  * with RETURNING to a regular table, and rejecting that case is
709  * altogether more annoying. In principle we could support it by
710  * modifying the targetlist to include dummy NULL columns
711  * corresponding to the dropped columns in the tupdesc. However,
712  * places like ruleutils.c would have to be fixed to not process such
713  * entries, and that would take an uncertain and possibly rather large
714  * amount of work. (Note we could not dodge that by marking the dummy
715  * columns resjunk, since it's precisely the non-resjunk tlist columns
716  * that are expected to correspond to table columns.)
717  */
718  if (attr->attisdropped)
719  ereport(ERROR,
720  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
721  isSelect ?
722  errmsg("cannot convert relation containing dropped columns to view") :
723  errmsg("cannot create a RETURNING list for a relation containing dropped columns")));
724 
725  /* Check name match if required; no need for two error texts here */
726  if (requireColumnNameMatch && strcmp(tle->resname, attname) != 0)
727  ereport(ERROR,
728  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
729  errmsg("SELECT rule's target entry %d has different column name from column \"%s\"",
730  i, attname),
731  errdetail("SELECT target entry is named \"%s\".",
732  tle->resname)));
733 
734  /* Check type match. */
735  tletypid = exprType((Node *) tle->expr);
736  if (attr->atttypid != tletypid)
737  ereport(ERROR,
738  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
739  isSelect ?
740  errmsg("SELECT rule's target entry %d has different type from column \"%s\"",
741  i, attname) :
742  errmsg("RETURNING list's entry %d has different type from column \"%s\"",
743  i, attname),
744  isSelect ?
745  errdetail("SELECT target entry has type %s, but column has type %s.",
746  format_type_be(tletypid),
747  format_type_be(attr->atttypid)) :
748  errdetail("RETURNING list entry has type %s, but column has type %s.",
749  format_type_be(tletypid),
750  format_type_be(attr->atttypid))));
751 
752  /*
753  * Allow typmods to be different only if one of them is -1, ie,
754  * "unspecified". This is necessary for cases like "numeric", where
755  * the table will have a filled-in default length but the select
756  * rule's expression will probably have typmod = -1.
757  */
758  tletypmod = exprTypmod((Node *) tle->expr);
759  if (attr->atttypmod != tletypmod &&
760  attr->atttypmod != -1 && tletypmod != -1)
761  ereport(ERROR,
762  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
763  isSelect ?
764  errmsg("SELECT rule's target entry %d has different size from column \"%s\"",
765  i, attname) :
766  errmsg("RETURNING list's entry %d has different size from column \"%s\"",
767  i, attname),
768  isSelect ?
769  errdetail("SELECT target entry has type %s, but column has type %s.",
770  format_type_with_typemod(tletypid, tletypmod),
771  format_type_with_typemod(attr->atttypid,
772  attr->atttypmod)) :
773  errdetail("RETURNING list entry has type %s, but column has type %s.",
774  format_type_with_typemod(tletypid, tletypmod),
775  format_type_with_typemod(attr->atttypid,
776  attr->atttypmod))));
777  }
778 
779  if (i != resultDesc->natts)
780  ereport(ERROR,
781  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
782  isSelect ?
783  errmsg("SELECT rule's target list has too few entries") :
784  errmsg("RETURNING list has too few entries")));
785 }
786 
787 /*
788  * setRuleCheckAsUser
789  * Recursively scan a query or expression tree and set the checkAsUser
790  * field to the given userid in all rtable entries.
791  *
792  * Note: for a view (ON SELECT rule), the checkAsUser field of the OLD
793  * RTE entry will be overridden when the view rule is expanded, and the
794  * checkAsUser field of the NEW entry is irrelevant because that entry's
795  * requiredPerms bits will always be zero. However, for other types of rules
796  * it's important to set these fields to match the rule owner. So we just set
797  * them always.
798  */
799 void
801 {
802  (void) setRuleCheckAsUser_walker(node, &userid);
803 }
804 
805 static bool
807 {
808  if (node == NULL)
809  return false;
810  if (IsA(node, Query))
811  {
812  setRuleCheckAsUser_Query((Query *) node, *context);
813  return false;
814  }
816  (void *) context);
817 }
818 
819 static void
821 {
822  ListCell *l;
823 
824  /* Set all the RTEs in this query node */
825  foreach(l, qry->rtable)
826  {
827  RangeTblEntry *rte = (RangeTblEntry *) lfirst(l);
828 
829  if (rte->rtekind == RTE_SUBQUERY)
830  {
831  /* Recurse into subquery in FROM */
832  setRuleCheckAsUser_Query(rte->subquery, userid);
833  }
834  else
835  rte->checkAsUser = userid;
836  }
837 
838  /* Recurse into subquery-in-WITH */
839  foreach(l, qry->cteList)
840  {
841  CommonTableExpr *cte = (CommonTableExpr *) lfirst(l);
842 
844  }
845 
846  /* If there are sublinks, search for them and process their RTEs */
847  if (qry->hasSubLinks)
848  query_tree_walker(qry, setRuleCheckAsUser_walker, (void *) &userid,
850 }
851 
852 
853 /*
854  * Change the firing semantics of an existing rule.
855  */
856 void
857 EnableDisableRule(Relation rel, const char *rulename,
858  char fires_when)
859 {
860  Relation pg_rewrite_desc;
861  Oid owningRel = RelationGetRelid(rel);
862  Oid eventRelationOid;
863  HeapTuple ruletup;
864  Form_pg_rewrite ruleform;
865  bool changed = false;
866 
867  /*
868  * Find the rule tuple to change.
869  */
870  pg_rewrite_desc = table_open(RewriteRelationId, RowExclusiveLock);
872  ObjectIdGetDatum(owningRel),
873  PointerGetDatum(rulename));
874  if (!HeapTupleIsValid(ruletup))
875  ereport(ERROR,
876  (errcode(ERRCODE_UNDEFINED_OBJECT),
877  errmsg("rule \"%s\" for relation \"%s\" does not exist",
878  rulename, get_rel_name(owningRel))));
879 
880  ruleform = (Form_pg_rewrite) GETSTRUCT(ruletup);
881 
882  /*
883  * Verify that the user has appropriate permissions.
884  */
885  eventRelationOid = ruleform->ev_class;
886  Assert(eventRelationOid == owningRel);
887  if (!pg_class_ownercheck(eventRelationOid, GetUserId()))
889  get_rel_name(eventRelationOid));
890 
891  /*
892  * Change ev_enabled if it is different from the desired new state.
893  */
894  if (DatumGetChar(ruleform->ev_enabled) !=
895  fires_when)
896  {
897  ruleform->ev_enabled = CharGetDatum(fires_when);
898  CatalogTupleUpdate(pg_rewrite_desc, &ruletup->t_self, ruletup);
899 
900  changed = true;
901  }
902 
903  InvokeObjectPostAlterHook(RewriteRelationId, ruleform->oid, 0);
904 
905  heap_freetuple(ruletup);
906  table_close(pg_rewrite_desc, RowExclusiveLock);
907 
908  /*
909  * If we changed anything, broadcast a SI inval message to force each
910  * backend (including our own!) to rebuild relation's relcache entry.
911  * Otherwise they will fail to apply the change promptly.
912  */
913  if (changed)
915 }
916 
917 
918 /*
919  * Perform permissions and integrity checks before acquiring a relation lock.
920  */
921 static void
922 RangeVarCallbackForRenameRule(const RangeVar *rv, Oid relid, Oid oldrelid,
923  void *arg)
924 {
925  HeapTuple tuple;
926  Form_pg_class form;
927 
928  tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
929  if (!HeapTupleIsValid(tuple))
930  return; /* concurrently dropped */
931  form = (Form_pg_class) GETSTRUCT(tuple);
932 
933  /* only tables and views can have rules */
934  if (form->relkind != RELKIND_RELATION &&
935  form->relkind != RELKIND_VIEW &&
936  form->relkind != RELKIND_PARTITIONED_TABLE)
937  ereport(ERROR,
938  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
939  errmsg("relation \"%s\" cannot have rules", rv->relname),
940  errdetail_relkind_not_supported(form->relkind)));
941 
942  if (!allowSystemTableMods && IsSystemClass(relid, form))
943  ereport(ERROR,
944  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
945  errmsg("permission denied: \"%s\" is a system catalog",
946  rv->relname)));
947 
948  /* you must own the table to rename one of its rules */
949  if (!pg_class_ownercheck(relid, GetUserId()))
951 
952  ReleaseSysCache(tuple);
953 }
954 
955 /*
956  * Rename an existing rewrite rule.
957  */
959 RenameRewriteRule(RangeVar *relation, const char *oldName,
960  const char *newName)
961 {
962  Oid relid;
963  Relation targetrel;
964  Relation pg_rewrite_desc;
965  HeapTuple ruletup;
966  Form_pg_rewrite ruleform;
967  Oid ruleOid;
968  ObjectAddress address;
969 
970  /*
971  * Look up name, check permissions, and acquire lock (which we will NOT
972  * release until end of transaction).
973  */
975  0,
977  NULL);
978 
979  /* Have lock already, so just need to build relcache entry. */
980  targetrel = relation_open(relid, NoLock);
981 
982  /* Prepare to modify pg_rewrite */
983  pg_rewrite_desc = table_open(RewriteRelationId, RowExclusiveLock);
984 
985  /* Fetch the rule's entry (it had better exist) */
987  ObjectIdGetDatum(relid),
988  PointerGetDatum(oldName));
989  if (!HeapTupleIsValid(ruletup))
990  ereport(ERROR,
991  (errcode(ERRCODE_UNDEFINED_OBJECT),
992  errmsg("rule \"%s\" for relation \"%s\" does not exist",
993  oldName, RelationGetRelationName(targetrel))));
994  ruleform = (Form_pg_rewrite) GETSTRUCT(ruletup);
995  ruleOid = ruleform->oid;
996 
997  /* rule with the new name should not already exist */
998  if (IsDefinedRewriteRule(relid, newName))
999  ereport(ERROR,
1001  errmsg("rule \"%s\" for relation \"%s\" already exists",
1002  newName, RelationGetRelationName(targetrel))));
1003 
1004  /*
1005  * We disallow renaming ON SELECT rules, because they should always be
1006  * named "_RETURN".
1007  */
1008  if (ruleform->ev_type == CMD_SELECT + '0')
1009  ereport(ERROR,
1010  (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1011  errmsg("renaming an ON SELECT rule is not allowed")));
1012 
1013  /* OK, do the update */
1014  namestrcpy(&(ruleform->rulename), newName);
1015 
1016  CatalogTupleUpdate(pg_rewrite_desc, &ruletup->t_self, ruletup);
1017 
1018  InvokeObjectPostAlterHook(RewriteRelationId, ruleOid, 0);
1019 
1020  heap_freetuple(ruletup);
1021  table_close(pg_rewrite_desc, RowExclusiveLock);
1022 
1023  /*
1024  * Invalidate relation's relcache entry so that other backends (and this
1025  * one too!) are sent SI message to make them rebuild relcache entries.
1026  * (Ideally this should happen automatically...)
1027  */
1028  CacheInvalidateRelcache(targetrel);
1029 
1030  ObjectAddressSet(address, RewriteRelationId, ruleOid);
1031 
1032  /*
1033  * Close rel, but keep exclusive lock!
1034  */
1035  relation_close(targetrel, NoLock);
1036 
1037  return address;
1038 }
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