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execReplication.c
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1 /*-------------------------------------------------------------------------
2  *
3  * execReplication.c
4  * miscellaneous executor routines for logical replication
5  *
6  * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  * IDENTIFICATION
10  * src/backend/executor/execReplication.c
11  *
12  *-------------------------------------------------------------------------
13  */
14 
15 #include "postgres.h"
16 
17 #include "access/relscan.h"
18 #include "access/transam.h"
19 #include "access/xact.h"
20 #include "commands/trigger.h"
21 #include "executor/executor.h"
22 #include "nodes/nodeFuncs.h"
23 #include "parser/parse_relation.h"
24 #include "parser/parsetree.h"
25 #include "storage/bufmgr.h"
26 #include "storage/lmgr.h"
27 #include "utils/builtins.h"
28 #include "utils/datum.h"
29 #include "utils/lsyscache.h"
30 #include "utils/memutils.h"
31 #include "utils/rel.h"
32 #include "utils/snapmgr.h"
33 #include "utils/syscache.h"
34 #include "utils/typcache.h"
35 #include "utils/tqual.h"
36 
37 
38 /*
39  * Setup a ScanKey for a search in the relation 'rel' for a tuple 'key' that
40  * is setup to match 'rel' (*NOT* idxrel!).
41  *
42  * Returns whether any column contains NULLs.
43  *
44  * This is not generic routine, it expects the idxrel to be replication
45  * identity of a rel and meet all limitations associated with that.
46  */
47 static bool
49  TupleTableSlot *searchslot)
50 {
51  int attoff;
52  bool isnull;
53  Datum indclassDatum;
54  oidvector *opclass;
55  int2vector *indkey = &idxrel->rd_index->indkey;
56  bool hasnulls = false;
57 
59 
60  indclassDatum = SysCacheGetAttr(INDEXRELID, idxrel->rd_indextuple,
61  Anum_pg_index_indclass, &isnull);
62  Assert(!isnull);
63  opclass = (oidvector *) DatumGetPointer(indclassDatum);
64 
65  /* Build scankey for every attribute in the index. */
66  for (attoff = 0; attoff < IndexRelationGetNumberOfKeyAttributes(idxrel); attoff++)
67  {
68  Oid operator;
69  Oid opfamily;
70  RegProcedure regop;
71  int pkattno = attoff + 1;
72  int mainattno = indkey->values[attoff];
73  Oid optype = get_opclass_input_type(opclass->values[attoff]);
74 
75  /*
76  * Load the operator info. We need this to get the equality operator
77  * function for the scan key.
78  */
79  opfamily = get_opclass_family(opclass->values[attoff]);
80 
81  operator = get_opfamily_member(opfamily, optype,
82  optype,
84  if (!OidIsValid(operator))
85  elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
86  BTEqualStrategyNumber, optype, optype, opfamily);
87 
88  regop = get_opcode(operator);
89 
90  /* Initialize the scankey. */
91  ScanKeyInit(&skey[attoff],
92  pkattno,
94  regop,
95  searchslot->tts_values[mainattno - 1]);
96 
97  /* Check for null value. */
98  if (searchslot->tts_isnull[mainattno - 1])
99  {
100  hasnulls = true;
101  skey[attoff].sk_flags |= SK_ISNULL;
102  }
103  }
104 
105  return hasnulls;
106 }
107 
108 /*
109  * Search the relation 'rel' for tuple using the index.
110  *
111  * If a matching tuple is found, lock it with lockmode, fill the slot with its
112  * contents, and return true. Return false otherwise.
113  */
114 bool
116  LockTupleMode lockmode,
117  TupleTableSlot *searchslot,
118  TupleTableSlot *outslot)
119 {
120  HeapTuple scantuple;
122  IndexScanDesc scan;
123  SnapshotData snap;
124  TransactionId xwait;
125  Relation idxrel;
126  bool found;
127 
128  /* Open the index. */
129  idxrel = index_open(idxoid, RowExclusiveLock);
130 
131  /* Start an index scan. */
132  InitDirtySnapshot(snap);
133  scan = index_beginscan(rel, idxrel, &snap,
135  0);
136 
137  /* Build scan key. */
138  build_replindex_scan_key(skey, rel, idxrel, searchslot);
139 
140 retry:
141  found = false;
142 
143  index_rescan(scan, skey, IndexRelationGetNumberOfKeyAttributes(idxrel), NULL, 0);
144 
145  /* Try to find the tuple */
146  if ((scantuple = index_getnext(scan, ForwardScanDirection)) != NULL)
147  {
148  found = true;
149  ExecStoreTuple(scantuple, outslot, InvalidBuffer, false);
150  ExecMaterializeSlot(outslot);
151 
152  xwait = TransactionIdIsValid(snap.xmin) ?
153  snap.xmin : snap.xmax;
154 
155  /*
156  * If the tuple is locked, wait for locking transaction to finish and
157  * retry.
158  */
159  if (TransactionIdIsValid(xwait))
160  {
161  XactLockTableWait(xwait, NULL, NULL, XLTW_None);
162  goto retry;
163  }
164  }
165 
166  /* Found tuple, try to lock it in the lockmode. */
167  if (found)
168  {
169  Buffer buf;
171  HTSU_Result res;
172  HeapTupleData locktup;
173 
174  ItemPointerCopy(&outslot->tts_tuple->t_self, &locktup.t_self);
175 
177 
178  res = heap_lock_tuple(rel, &locktup, GetCurrentCommandId(false),
179  lockmode,
181  false /* don't follow updates */ ,
182  &buf, &hufd);
183  /* the tuple slot already has the buffer pinned */
184  ReleaseBuffer(buf);
185 
187 
188  switch (res)
189  {
191  break;
192  case HeapTupleUpdated:
193  /* XXX: Improve handling here */
195  ereport(LOG,
196  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
197  errmsg("tuple to be locked was already moved to another partition due to concurrent update, retrying")));
198  else
199  ereport(LOG,
200  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
201  errmsg("concurrent update, retrying")));
202  goto retry;
203  case HeapTupleInvisible:
204  elog(ERROR, "attempted to lock invisible tuple");
205  break;
206  default:
207  elog(ERROR, "unexpected heap_lock_tuple status: %u", res);
208  break;
209  }
210  }
211 
212  index_endscan(scan);
213 
214  /* Don't release lock until commit. */
215  index_close(idxrel, NoLock);
216 
217  return found;
218 }
219 
220 /*
221  * Compare the tuple and slot and check if they have equal values.
222  *
223  * We use binary datum comparison which might return false negatives but
224  * that's the best we can do here as there may be multiple notions of
225  * equality for the data types and table columns don't specify which one
226  * to use.
227  */
228 static bool
230 {
232  bool isnull[MaxTupleAttributeNumber];
233  int attrnum;
234 
235  heap_deform_tuple(tup, desc, values, isnull);
236 
237  /* Check equality of the attributes. */
238  for (attrnum = 0; attrnum < desc->natts; attrnum++)
239  {
240  Form_pg_attribute att;
241  TypeCacheEntry *typentry;
242 
243  /*
244  * If one value is NULL and other is not, then they are certainly not
245  * equal
246  */
247  if (isnull[attrnum] != slot->tts_isnull[attrnum])
248  return false;
249 
250  /*
251  * If both are NULL, they can be considered equal.
252  */
253  if (isnull[attrnum])
254  continue;
255 
256  att = TupleDescAttr(desc, attrnum);
257 
258  typentry = lookup_type_cache(att->atttypid, TYPECACHE_EQ_OPR_FINFO);
259  if (!OidIsValid(typentry->eq_opr_finfo.fn_oid))
260  ereport(ERROR,
261  (errcode(ERRCODE_UNDEFINED_FUNCTION),
262  errmsg("could not identify an equality operator for type %s",
263  format_type_be(att->atttypid))));
264 
265  if (!DatumGetBool(FunctionCall2(&typentry->eq_opr_finfo,
266  values[attrnum],
267  slot->tts_values[attrnum])))
268  return false;
269  }
270 
271  return true;
272 }
273 
274 /*
275  * Search the relation 'rel' for tuple using the sequential scan.
276  *
277  * If a matching tuple is found, lock it with lockmode, fill the slot with its
278  * contents, and return true. Return false otherwise.
279  *
280  * Note that this stops on the first matching tuple.
281  *
282  * This can obviously be quite slow on tables that have more than few rows.
283  */
284 bool
286  TupleTableSlot *searchslot, TupleTableSlot *outslot)
287 {
288  HeapTuple scantuple;
289  HeapScanDesc scan;
290  SnapshotData snap;
291  TransactionId xwait;
292  bool found;
293  TupleDesc desc = RelationGetDescr(rel);
294 
295  Assert(equalTupleDescs(desc, outslot->tts_tupleDescriptor));
296 
297  /* Start a heap scan. */
298  InitDirtySnapshot(snap);
299  scan = heap_beginscan(rel, &snap, 0, NULL);
300 
301 retry:
302  found = false;
303 
304  heap_rescan(scan, NULL);
305 
306  /* Try to find the tuple */
307  while ((scantuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
308  {
309  if (!tuple_equals_slot(desc, scantuple, searchslot))
310  continue;
311 
312  found = true;
313  ExecStoreTuple(scantuple, outslot, InvalidBuffer, false);
314  ExecMaterializeSlot(outslot);
315 
316  xwait = TransactionIdIsValid(snap.xmin) ?
317  snap.xmin : snap.xmax;
318 
319  /*
320  * If the tuple is locked, wait for locking transaction to finish and
321  * retry.
322  */
323  if (TransactionIdIsValid(xwait))
324  {
325  XactLockTableWait(xwait, NULL, NULL, XLTW_None);
326  goto retry;
327  }
328  }
329 
330  /* Found tuple, try to lock it in the lockmode. */
331  if (found)
332  {
333  Buffer buf;
335  HTSU_Result res;
336  HeapTupleData locktup;
337 
338  ItemPointerCopy(&outslot->tts_tuple->t_self, &locktup.t_self);
339 
341 
342  res = heap_lock_tuple(rel, &locktup, GetCurrentCommandId(false),
343  lockmode,
345  false /* don't follow updates */ ,
346  &buf, &hufd);
347  /* the tuple slot already has the buffer pinned */
348  ReleaseBuffer(buf);
349 
351 
352  switch (res)
353  {
355  break;
356  case HeapTupleUpdated:
357  /* XXX: Improve handling here */
359  ereport(LOG,
360  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
361  errmsg("tuple to be locked was already moved to another partition due to concurrent update, retrying")));
362  else
363  ereport(LOG,
364  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
365  errmsg("concurrent update, retrying")));
366  goto retry;
367  case HeapTupleInvisible:
368  elog(ERROR, "attempted to lock invisible tuple");
369  break;
370  default:
371  elog(ERROR, "unexpected heap_lock_tuple status: %u", res);
372  break;
373  }
374  }
375 
376  heap_endscan(scan);
377 
378  return found;
379 }
380 
381 /*
382  * Insert tuple represented in the slot to the relation, update the indexes,
383  * and execute any constraints and per-row triggers.
384  *
385  * Caller is responsible for opening the indexes.
386  */
387 void
389 {
390  bool skip_tuple = false;
391  HeapTuple tuple;
392  ResultRelInfo *resultRelInfo = estate->es_result_relation_info;
393  Relation rel = resultRelInfo->ri_RelationDesc;
394 
395  /* For now we support only tables. */
396  Assert(rel->rd_rel->relkind == RELKIND_RELATION);
397 
399 
400  /* BEFORE ROW INSERT Triggers */
401  if (resultRelInfo->ri_TrigDesc &&
402  resultRelInfo->ri_TrigDesc->trig_insert_before_row)
403  {
404  slot = ExecBRInsertTriggers(estate, resultRelInfo, slot);
405 
406  if (slot == NULL) /* "do nothing" */
407  skip_tuple = true;
408  }
409 
410  if (!skip_tuple)
411  {
412  List *recheckIndexes = NIL;
413 
414  /* Check the constraints of the tuple */
415  if (rel->rd_att->constr)
416  ExecConstraints(resultRelInfo, slot, estate);
417  if (resultRelInfo->ri_PartitionCheck)
418  ExecPartitionCheck(resultRelInfo, slot, estate, true);
419 
420  /* Store the slot into tuple that we can inspect. */
421  tuple = ExecMaterializeSlot(slot);
422 
423  /* OK, store the tuple and create index entries for it */
424  simple_heap_insert(rel, tuple);
425 
426  if (resultRelInfo->ri_NumIndices > 0)
427  recheckIndexes = ExecInsertIndexTuples(slot, &(tuple->t_self),
428  estate, false, NULL,
429  NIL);
430 
431  /* AFTER ROW INSERT Triggers */
432  ExecARInsertTriggers(estate, resultRelInfo, tuple,
433  recheckIndexes, NULL);
434 
435  /*
436  * XXX we should in theory pass a TransitionCaptureState object to the
437  * above to capture transition tuples, but after statement triggers
438  * don't actually get fired by replication yet anyway
439  */
440 
441  list_free(recheckIndexes);
442  }
443 }
444 
445 /*
446  * Find the searchslot tuple and update it with data in the slot,
447  * update the indexes, and execute any constraints and per-row triggers.
448  *
449  * Caller is responsible for opening the indexes.
450  */
451 void
453  TupleTableSlot *searchslot, TupleTableSlot *slot)
454 {
455  bool skip_tuple = false;
456  HeapTuple tuple;
457  ResultRelInfo *resultRelInfo = estate->es_result_relation_info;
458  Relation rel = resultRelInfo->ri_RelationDesc;
459 
460  /* For now we support only tables. */
461  Assert(rel->rd_rel->relkind == RELKIND_RELATION);
462 
464 
465  /* BEFORE ROW UPDATE Triggers */
466  if (resultRelInfo->ri_TrigDesc &&
467  resultRelInfo->ri_TrigDesc->trig_update_before_row)
468  {
469  slot = ExecBRUpdateTriggers(estate, epqstate, resultRelInfo,
470  &searchslot->tts_tuple->t_self,
471  NULL, slot);
472 
473  if (slot == NULL) /* "do nothing" */
474  skip_tuple = true;
475  }
476 
477  if (!skip_tuple)
478  {
479  List *recheckIndexes = NIL;
480 
481  /* Check the constraints of the tuple */
482  if (rel->rd_att->constr)
483  ExecConstraints(resultRelInfo, slot, estate);
484  if (resultRelInfo->ri_PartitionCheck)
485  ExecPartitionCheck(resultRelInfo, slot, estate, true);
486 
487  /* Store the slot into tuple that we can write. */
488  tuple = ExecMaterializeSlot(slot);
489 
490  /* OK, update the tuple and index entries for it */
491  simple_heap_update(rel, &searchslot->tts_tuple->t_self,
492  slot->tts_tuple);
493 
494  if (resultRelInfo->ri_NumIndices > 0 &&
496  recheckIndexes = ExecInsertIndexTuples(slot, &(tuple->t_self),
497  estate, false, NULL,
498  NIL);
499 
500  /* AFTER ROW UPDATE Triggers */
501  ExecARUpdateTriggers(estate, resultRelInfo,
502  &searchslot->tts_tuple->t_self,
503  NULL, tuple, recheckIndexes, NULL);
504 
505  list_free(recheckIndexes);
506  }
507 }
508 
509 /*
510  * Find the searchslot tuple and delete it, and execute any constraints
511  * and per-row triggers.
512  *
513  * Caller is responsible for opening the indexes.
514  */
515 void
517  TupleTableSlot *searchslot)
518 {
519  bool skip_tuple = false;
520  ResultRelInfo *resultRelInfo = estate->es_result_relation_info;
521  Relation rel = resultRelInfo->ri_RelationDesc;
522 
523  /* For now we support only tables. */
524  Assert(rel->rd_rel->relkind == RELKIND_RELATION);
525 
527 
528  /* BEFORE ROW DELETE Triggers */
529  if (resultRelInfo->ri_TrigDesc &&
530  resultRelInfo->ri_TrigDesc->trig_delete_before_row)
531  {
532  skip_tuple = !ExecBRDeleteTriggers(estate, epqstate, resultRelInfo,
533  &searchslot->tts_tuple->t_self,
534  NULL);
535  }
536 
537  if (!skip_tuple)
538  {
539  List *recheckIndexes = NIL;
540 
541  /* OK, delete the tuple */
542  simple_heap_delete(rel, &searchslot->tts_tuple->t_self);
543 
544  /* AFTER ROW DELETE Triggers */
545  ExecARDeleteTriggers(estate, resultRelInfo,
546  &searchslot->tts_tuple->t_self, NULL, NULL);
547 
548  list_free(recheckIndexes);
549  }
550 }
551 
552 /*
553  * Check if command can be executed with current replica identity.
554  */
555 void
557 {
558  PublicationActions *pubactions;
559 
560  /* We only need to do checks for UPDATE and DELETE. */
561  if (cmd != CMD_UPDATE && cmd != CMD_DELETE)
562  return;
563 
564  /* If relation has replica identity we are always good. */
565  if (rel->rd_rel->relreplident == REPLICA_IDENTITY_FULL ||
567  return;
568 
569  /*
570  * This is either UPDATE OR DELETE and there is no replica identity.
571  *
572  * Check if the table publishes UPDATES or DELETES.
573  */
574  pubactions = GetRelationPublicationActions(rel);
575  if (cmd == CMD_UPDATE && pubactions->pubupdate)
576  ereport(ERROR,
577  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
578  errmsg("cannot update table \"%s\" because it does not have a replica identity and publishes updates",
580  errhint("To enable updating the table, set REPLICA IDENTITY using ALTER TABLE.")));
581  else if (cmd == CMD_DELETE && pubactions->pubdelete)
582  ereport(ERROR,
583  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
584  errmsg("cannot delete from table \"%s\" because it does not have a replica identity and publishes deletes",
586  errhint("To enable deleting from the table, set REPLICA IDENTITY using ALTER TABLE.")));
587 }
588 
589 
590 /*
591  * Check if we support writing into specific relkind.
592  *
593  * The nspname and relname are only needed for error reporting.
594  */
595 void
596 CheckSubscriptionRelkind(char relkind, const char *nspname,
597  const char *relname)
598 {
599  /*
600  * We currently only support writing to regular tables.
601  */
602  if (relkind != RELKIND_RELATION)
603  ereport(ERROR,
604  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
605  errmsg("logical replication target relation \"%s.%s\" is not a table",
606  nspname, relname)));
607 }
void ExecSimpleRelationInsert(EState *estate, TupleTableSlot *slot)
int ri_NumIndices
Definition: execnodes.h:400
#define NIL
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LockTupleMode
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#define ItemPointerIndicatesMovedPartitions(pointer)
Definition: itemptr.h:184
List * ri_PartitionCheck
Definition: execnodes.h:454
TupleDesc rd_att
Definition: rel.h:85
FmgrInfo eq_opr_finfo
Definition: typcache.h:71
TypeCacheEntry * lookup_type_cache(Oid type_id, int flags)
Definition: typcache.c:321
RegProcedure get_opcode(Oid opno)
Definition: lsyscache.c:1079
Oid fn_oid
Definition: fmgr.h:59
struct PublicationActions * GetRelationPublicationActions(Relation relation)
Definition: relcache.c:5191
bool ExecBRDeleteTriggers(EState *estate, EPQState *epqstate, ResultRelInfo *relinfo, ItemPointer tupleid, HeapTuple fdw_trigtuple)
Definition: trigger.c:2730
int sk_flags
Definition: skey.h:66
void XactLockTableWait(TransactionId xid, Relation rel, ItemPointer ctid, XLTW_Oper oper)
Definition: lmgr.c:554
#define HeapTupleIsHeapOnly(tuple)
Definition: htup_details.h:698
#define Assert(condition)
Definition: c.h:699
TupleConstr * constr
Definition: tupdesc.h:87
#define INDEX_MAX_KEYS
void simple_heap_delete(Relation relation, ItemPointer tid)
Definition: heapam.c:3455
void simple_heap_update(Relation relation, ItemPointer otid, HeapTuple tup)
Definition: heapam.c:4599
HeapTuple ExecMaterializeSlot(TupleTableSlot *slot)
Definition: execTuples.c:781
int16 values[FLEXIBLE_ARRAY_MEMBER]
Definition: c.h:552
Oid get_opclass_family(Oid opclass)
Definition: lsyscache.c:1032
Snapshot GetLatestSnapshot(void)
Definition: snapmgr.c:379
void index_close(Relation relation, LOCKMODE lockmode)
Definition: indexam.c:176
#define DatumGetPointer(X)
Definition: postgres.h:534
void heap_deform_tuple(HeapTuple tuple, TupleDesc tupleDesc, Datum *values, bool *isnull)
Definition: heaptuple.c:1315
static Datum values[MAXATTR]
Definition: bootstrap.c:164
int errmsg(const char *fmt,...)
Definition: elog.c:797
void list_free(List *list)
Definition: list.c:1133
bool RelationFindReplTupleSeq(Relation rel, LockTupleMode lockmode, TupleTableSlot *searchslot, TupleTableSlot *outslot)
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
bool ExecPartitionCheck(ResultRelInfo *resultRelInfo, TupleTableSlot *slot, EState *estate, bool emitError)
Definition: execMain.c:1864
bool equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2)
Definition: tupdesc.c:409
TupleTableSlot * ExecBRInsertTriggers(EState *estate, ResultRelInfo *relinfo, TupleTableSlot *slot)
Definition: trigger.c:2515
ItemPointerData ctid
Definition: heapam.h:70
HeapTuple tts_tuple
Definition: tuptable.h:122
CommandId GetCurrentCommandId(bool used)
Definition: xact.c:679
#define elog
Definition: elog.h:219
#define TransactionIdIsValid(xid)
Definition: transam.h:41
Definition: pg_list.h:45
HeapScanDesc heap_beginscan(Relation relation, Snapshot snapshot, int nkeys, ScanKey key)
Definition: heapam.c:1404
int Buffer
Definition: buf.h:23
static bool build_replindex_scan_key(ScanKey skey, Relation rel, Relation idxrel, TupleTableSlot *searchslot)
#define RelationGetRelid(relation)
Definition: rel.h:407
CmdType
Definition: nodes.h:656
Relation index_open(Oid relationId, LOCKMODE lockmode)
Definition: indexam.c:150
#define BTEqualStrategyNumber
Definition: stratnum.h:31
void ExecSimpleRelationUpdate(EState *estate, EPQState *epqstate, TupleTableSlot *searchslot, TupleTableSlot *slot)
HeapTuple index_getnext(IndexScanDesc scan, ScanDirection direction)
Definition: indexam.c:659
IndexScanDesc index_beginscan(Relation heapRelation, Relation indexRelation, Snapshot snapshot, int nkeys, int norderbys)
Definition: indexam.c:221
#define ItemPointerCopy(fromPointer, toPointer)
Definition: itemptr.h:161
bool trig_delete_before_row
Definition: reltrigger.h:65
Oid get_opclass_input_type(Oid opclass)
Definition: lsyscache.c:1054
ResultRelInfo * es_result_relation_info
Definition: execnodes.h:492