PostgreSQL Source Code  git master
pg_subscription.c
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1 /*-------------------------------------------------------------------------
2  *
3  * pg_subscription.c
4  * replication subscriptions
5  *
6  * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  * IDENTIFICATION
10  * src/backend/catalog/pg_subscription.c
11  *
12  *-------------------------------------------------------------------------
13  */
14 
15 #include "postgres.h"
16 
17 #include "access/genam.h"
18 #include "access/heapam.h"
19 #include "access/htup_details.h"
20 #include "access/tableam.h"
21 #include "access/xact.h"
22 #include "catalog/indexing.h"
25 #include "catalog/pg_type.h"
26 #include "miscadmin.h"
27 #include "nodes/makefuncs.h"
28 #include "storage/lmgr.h"
29 #include "utils/array.h"
30 #include "utils/builtins.h"
31 #include "utils/fmgroids.h"
32 #include "utils/lsyscache.h"
33 #include "utils/pg_lsn.h"
34 #include "utils/rel.h"
35 #include "utils/syscache.h"
36 
37 static List *textarray_to_stringlist(ArrayType *textarray);
38 
39 /*
40  * Fetch the subscription from the syscache.
41  */
43 GetSubscription(Oid subid, bool missing_ok)
44 {
45  HeapTuple tup;
46  Subscription *sub;
47  Form_pg_subscription subform;
48  Datum datum;
49  bool isnull;
50 
52 
53  if (!HeapTupleIsValid(tup))
54  {
55  if (missing_ok)
56  return NULL;
57 
58  elog(ERROR, "cache lookup failed for subscription %u", subid);
59  }
60 
61  subform = (Form_pg_subscription) GETSTRUCT(tup);
62 
63  sub = (Subscription *) palloc(sizeof(Subscription));
64  sub->oid = subid;
65  sub->dbid = subform->subdbid;
66  sub->skiplsn = subform->subskiplsn;
67  sub->name = pstrdup(NameStr(subform->subname));
68  sub->owner = subform->subowner;
69  sub->enabled = subform->subenabled;
70  sub->binary = subform->subbinary;
71  sub->stream = subform->substream;
72  sub->twophasestate = subform->subtwophasestate;
73  sub->disableonerr = subform->subdisableonerr;
74 
75  /* Get conninfo */
77  tup,
78  Anum_pg_subscription_subconninfo,
79  &isnull);
80  Assert(!isnull);
81  sub->conninfo = TextDatumGetCString(datum);
82 
83  /* Get slotname */
85  tup,
86  Anum_pg_subscription_subslotname,
87  &isnull);
88  if (!isnull)
89  sub->slotname = pstrdup(NameStr(*DatumGetName(datum)));
90  else
91  sub->slotname = NULL;
92 
93  /* Get synccommit */
95  tup,
96  Anum_pg_subscription_subsynccommit,
97  &isnull);
98  Assert(!isnull);
99  sub->synccommit = TextDatumGetCString(datum);
100 
101  /* Get publications */
103  tup,
104  Anum_pg_subscription_subpublications,
105  &isnull);
106  Assert(!isnull);
108 
109  ReleaseSysCache(tup);
110 
111  return sub;
112 }
113 
114 /*
115  * Return number of subscriptions defined in given database.
116  * Used by dropdb() to check if database can indeed be dropped.
117  */
118 int
120 {
121  int nsubs = 0;
122  Relation rel;
123  ScanKeyData scankey;
124  SysScanDesc scan;
125  HeapTuple tup;
126 
127  rel = table_open(SubscriptionRelationId, RowExclusiveLock);
128 
129  ScanKeyInit(&scankey,
130  Anum_pg_subscription_subdbid,
131  BTEqualStrategyNumber, F_OIDEQ,
132  ObjectIdGetDatum(dbid));
133 
134  scan = systable_beginscan(rel, InvalidOid, false,
135  NULL, 1, &scankey);
136 
137  while (HeapTupleIsValid(tup = systable_getnext(scan)))
138  nsubs++;
139 
140  systable_endscan(scan);
141 
142  table_close(rel, NoLock);
143 
144  return nsubs;
145 }
146 
147 /*
148  * Free memory allocated by subscription struct.
149  */
150 void
152 {
153  pfree(sub->name);
154  pfree(sub->conninfo);
155  if (sub->slotname)
156  pfree(sub->slotname);
158  pfree(sub);
159 }
160 
161 /*
162  * Disable the given subscription.
163  */
164 void
166 {
167  Relation rel;
168  bool nulls[Natts_pg_subscription];
169  bool replaces[Natts_pg_subscription];
170  Datum values[Natts_pg_subscription];
171  HeapTuple tup;
172 
173  /* Look up the subscription in the catalog */
174  rel = table_open(SubscriptionRelationId, RowExclusiveLock);
176 
177  if (!HeapTupleIsValid(tup))
178  elog(ERROR, "cache lookup failed for subscription %u", subid);
179 
180  LockSharedObject(SubscriptionRelationId, subid, 0, AccessShareLock);
181 
182  /* Form a new tuple. */
183  memset(values, 0, sizeof(values));
184  memset(nulls, false, sizeof(nulls));
185  memset(replaces, false, sizeof(replaces));
186 
187  /* Set the subscription to disabled. */
188  values[Anum_pg_subscription_subenabled - 1] = BoolGetDatum(false);
189  replaces[Anum_pg_subscription_subenabled - 1] = true;
190 
191  /* Update the catalog */
192  tup = heap_modify_tuple(tup, RelationGetDescr(rel), values, nulls,
193  replaces);
194  CatalogTupleUpdate(rel, &tup->t_self, tup);
195  heap_freetuple(tup);
196 
197  table_close(rel, NoLock);
198 }
199 
200 /*
201  * get_subscription_oid - given a subscription name, look up the OID
202  *
203  * If missing_ok is false, throw an error if name not found. If true, just
204  * return InvalidOid.
205  */
206 Oid
207 get_subscription_oid(const char *subname, bool missing_ok)
208 {
209  Oid oid;
210 
211  oid = GetSysCacheOid2(SUBSCRIPTIONNAME, Anum_pg_subscription_oid,
213  if (!OidIsValid(oid) && !missing_ok)
214  ereport(ERROR,
215  (errcode(ERRCODE_UNDEFINED_OBJECT),
216  errmsg("subscription \"%s\" does not exist", subname)));
217  return oid;
218 }
219 
220 /*
221  * get_subscription_name - given a subscription OID, look up the name
222  *
223  * If missing_ok is false, throw an error if name not found. If true, just
224  * return NULL.
225  */
226 char *
227 get_subscription_name(Oid subid, bool missing_ok)
228 {
229  HeapTuple tup;
230  char *subname;
231  Form_pg_subscription subform;
232 
234 
235  if (!HeapTupleIsValid(tup))
236  {
237  if (!missing_ok)
238  elog(ERROR, "cache lookup failed for subscription %u", subid);
239  return NULL;
240  }
241 
242  subform = (Form_pg_subscription) GETSTRUCT(tup);
243  subname = pstrdup(NameStr(subform->subname));
244 
245  ReleaseSysCache(tup);
246 
247  return subname;
248 }
249 
250 /*
251  * Convert text array to list of strings.
252  *
253  * Note: the resulting list of strings is pallocated here.
254  */
255 static List *
257 {
258  Datum *elems;
259  int nelems,
260  i;
261  List *res = NIL;
262 
263  deconstruct_array(textarray,
264  TEXTOID, -1, false, TYPALIGN_INT,
265  &elems, NULL, &nelems);
266 
267  if (nelems == 0)
268  return NIL;
269 
270  for (i = 0; i < nelems; i++)
272 
273  return res;
274 }
275 
276 /*
277  * Add new state record for a subscription table.
278  */
279 void
281  XLogRecPtr sublsn)
282 {
283  Relation rel;
284  HeapTuple tup;
285  bool nulls[Natts_pg_subscription_rel];
286  Datum values[Natts_pg_subscription_rel];
287 
288  LockSharedObject(SubscriptionRelationId, subid, 0, AccessShareLock);
289 
290  rel = table_open(SubscriptionRelRelationId, RowExclusiveLock);
291 
292  /* Try finding existing mapping. */
294  ObjectIdGetDatum(relid),
295  ObjectIdGetDatum(subid));
296  if (HeapTupleIsValid(tup))
297  elog(ERROR, "subscription table %u in subscription %u already exists",
298  relid, subid);
299 
300  /* Form the tuple. */
301  memset(values, 0, sizeof(values));
302  memset(nulls, false, sizeof(nulls));
303  values[Anum_pg_subscription_rel_srsubid - 1] = ObjectIdGetDatum(subid);
304  values[Anum_pg_subscription_rel_srrelid - 1] = ObjectIdGetDatum(relid);
305  values[Anum_pg_subscription_rel_srsubstate - 1] = CharGetDatum(state);
306  if (sublsn != InvalidXLogRecPtr)
307  values[Anum_pg_subscription_rel_srsublsn - 1] = LSNGetDatum(sublsn);
308  else
309  nulls[Anum_pg_subscription_rel_srsublsn - 1] = true;
310 
311  tup = heap_form_tuple(RelationGetDescr(rel), values, nulls);
312 
313  /* Insert tuple into catalog. */
314  CatalogTupleInsert(rel, tup);
315 
316  heap_freetuple(tup);
317 
318  /* Cleanup. */
319  table_close(rel, NoLock);
320 }
321 
322 /*
323  * Update the state of a subscription table.
324  */
325 void
327  XLogRecPtr sublsn)
328 {
329  Relation rel;
330  HeapTuple tup;
331  bool nulls[Natts_pg_subscription_rel];
332  Datum values[Natts_pg_subscription_rel];
333  bool replaces[Natts_pg_subscription_rel];
334 
335  LockSharedObject(SubscriptionRelationId, subid, 0, AccessShareLock);
336 
337  rel = table_open(SubscriptionRelRelationId, RowExclusiveLock);
338 
339  /* Try finding existing mapping. */
341  ObjectIdGetDatum(relid),
342  ObjectIdGetDatum(subid));
343  if (!HeapTupleIsValid(tup))
344  elog(ERROR, "subscription table %u in subscription %u does not exist",
345  relid, subid);
346 
347  /* Update the tuple. */
348  memset(values, 0, sizeof(values));
349  memset(nulls, false, sizeof(nulls));
350  memset(replaces, false, sizeof(replaces));
351 
352  replaces[Anum_pg_subscription_rel_srsubstate - 1] = true;
353  values[Anum_pg_subscription_rel_srsubstate - 1] = CharGetDatum(state);
354 
355  replaces[Anum_pg_subscription_rel_srsublsn - 1] = true;
356  if (sublsn != InvalidXLogRecPtr)
357  values[Anum_pg_subscription_rel_srsublsn - 1] = LSNGetDatum(sublsn);
358  else
359  nulls[Anum_pg_subscription_rel_srsublsn - 1] = true;
360 
361  tup = heap_modify_tuple(tup, RelationGetDescr(rel), values, nulls,
362  replaces);
363 
364  /* Update the catalog. */
365  CatalogTupleUpdate(rel, &tup->t_self, tup);
366 
367  /* Cleanup. */
368  table_close(rel, NoLock);
369 }
370 
371 /*
372  * Get state of subscription table.
373  *
374  * Returns SUBREL_STATE_UNKNOWN when the table is not in the subscription.
375  */
376 char
378 {
379  HeapTuple tup;
380  char substate;
381  bool isnull;
382  Datum d;
383  Relation rel;
384 
385  /*
386  * This is to avoid the race condition with AlterSubscription which tries
387  * to remove this relstate.
388  */
389  rel = table_open(SubscriptionRelRelationId, AccessShareLock);
390 
391  /* Try finding the mapping. */
393  ObjectIdGetDatum(relid),
394  ObjectIdGetDatum(subid));
395 
396  if (!HeapTupleIsValid(tup))
397  {
399  *sublsn = InvalidXLogRecPtr;
400  return SUBREL_STATE_UNKNOWN;
401  }
402 
403  /* Get the state. */
404  substate = ((Form_pg_subscription_rel) GETSTRUCT(tup))->srsubstate;
405 
406  /* Get the LSN */
408  Anum_pg_subscription_rel_srsublsn, &isnull);
409  if (isnull)
410  *sublsn = InvalidXLogRecPtr;
411  else
412  *sublsn = DatumGetLSN(d);
413 
414  /* Cleanup */
415  ReleaseSysCache(tup);
416 
418 
419  return substate;
420 }
421 
422 /*
423  * Drop subscription relation mapping. These can be for a particular
424  * subscription, or for a particular relation, or both.
425  */
426 void
428 {
429  Relation rel;
430  TableScanDesc scan;
431  ScanKeyData skey[2];
432  HeapTuple tup;
433  int nkeys = 0;
434 
435  rel = table_open(SubscriptionRelRelationId, RowExclusiveLock);
436 
437  if (OidIsValid(subid))
438  {
439  ScanKeyInit(&skey[nkeys++],
440  Anum_pg_subscription_rel_srsubid,
442  F_OIDEQ,
443  ObjectIdGetDatum(subid));
444  }
445 
446  if (OidIsValid(relid))
447  {
448  ScanKeyInit(&skey[nkeys++],
449  Anum_pg_subscription_rel_srrelid,
451  F_OIDEQ,
452  ObjectIdGetDatum(relid));
453  }
454 
455  /* Do the search and delete what we found. */
456  scan = table_beginscan_catalog(rel, nkeys, skey);
458  {
460 
461  subrel = (Form_pg_subscription_rel) GETSTRUCT(tup);
462 
463  /*
464  * We don't allow to drop the relation mapping when the table
465  * synchronization is in progress unless the caller updates the
466  * corresponding subscription as well. This is to ensure that we don't
467  * leave tablesync slots or origins in the system when the
468  * corresponding table is dropped.
469  */
470  if (!OidIsValid(subid) && subrel->srsubstate != SUBREL_STATE_READY)
471  {
472  ereport(ERROR,
473  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
474  errmsg("could not drop relation mapping for subscription \"%s\"",
475  get_subscription_name(subrel->srsubid, false)),
476  errdetail("Table synchronization for relation \"%s\" is in progress and is in state \"%c\".",
477  get_rel_name(relid), subrel->srsubstate),
478 
479  /*
480  * translator: first %s is a SQL ALTER command and second %s is a
481  * SQL DROP command
482  */
483  errhint("Use %s to enable subscription if not already enabled or use %s to drop the subscription.",
484  "ALTER SUBSCRIPTION ... ENABLE",
485  "DROP SUBSCRIPTION ...")));
486  }
487 
488  CatalogTupleDelete(rel, &tup->t_self);
489  }
490  table_endscan(scan);
491 
493 }
494 
495 /*
496  * Does the subscription have any relations?
497  *
498  * Use this function only to know true/false, and when you have no need for the
499  * List returned by GetSubscriptionRelations.
500  */
501 bool
503 {
504  Relation rel;
505  ScanKeyData skey[1];
506  SysScanDesc scan;
507  bool has_subrels;
508 
509  rel = table_open(SubscriptionRelRelationId, AccessShareLock);
510 
511  ScanKeyInit(&skey[0],
512  Anum_pg_subscription_rel_srsubid,
513  BTEqualStrategyNumber, F_OIDEQ,
514  ObjectIdGetDatum(subid));
515 
516  scan = systable_beginscan(rel, InvalidOid, false,
517  NULL, 1, skey);
518 
519  /* If even a single tuple exists then the subscription has tables. */
520  has_subrels = HeapTupleIsValid(systable_getnext(scan));
521 
522  /* Cleanup */
523  systable_endscan(scan);
525 
526  return has_subrels;
527 }
528 
529 /*
530  * Get all relations for subscription.
531  *
532  * Returned list is palloc'ed in current memory context.
533  */
534 List *
536 {
537  List *res = NIL;
538  Relation rel;
539  HeapTuple tup;
540  ScanKeyData skey[1];
541  SysScanDesc scan;
542 
543  rel = table_open(SubscriptionRelRelationId, AccessShareLock);
544 
545  ScanKeyInit(&skey[0],
546  Anum_pg_subscription_rel_srsubid,
547  BTEqualStrategyNumber, F_OIDEQ,
548  ObjectIdGetDatum(subid));
549 
550  scan = systable_beginscan(rel, InvalidOid, false,
551  NULL, 1, skey);
552 
553  while (HeapTupleIsValid(tup = systable_getnext(scan)))
554  {
556  SubscriptionRelState *relstate;
557  Datum d;
558  bool isnull;
559 
560  subrel = (Form_pg_subscription_rel) GETSTRUCT(tup);
561 
562  relstate = (SubscriptionRelState *) palloc(sizeof(SubscriptionRelState));
563  relstate->relid = subrel->srrelid;
564  relstate->state = subrel->srsubstate;
566  Anum_pg_subscription_rel_srsublsn, &isnull);
567  if (isnull)
568  relstate->lsn = InvalidXLogRecPtr;
569  else
570  relstate->lsn = DatumGetLSN(d);
571 
572  res = lappend(res, relstate);
573  }
574 
575  /* Cleanup */
576  systable_endscan(scan);
578 
579  return res;
580 }
581 
582 /*
583  * Get all relations for subscription that are not in a ready state.
584  *
585  * Returned list is palloc'ed in current memory context.
586  */
587 List *
589 {
590  List *res = NIL;
591  Relation rel;
592  HeapTuple tup;
593  int nkeys = 0;
594  ScanKeyData skey[2];
595  SysScanDesc scan;
596 
597  rel = table_open(SubscriptionRelRelationId, AccessShareLock);
598 
599  ScanKeyInit(&skey[nkeys++],
600  Anum_pg_subscription_rel_srsubid,
601  BTEqualStrategyNumber, F_OIDEQ,
602  ObjectIdGetDatum(subid));
603 
604  ScanKeyInit(&skey[nkeys++],
605  Anum_pg_subscription_rel_srsubstate,
606  BTEqualStrategyNumber, F_CHARNE,
607  CharGetDatum(SUBREL_STATE_READY));
608 
609  scan = systable_beginscan(rel, InvalidOid, false,
610  NULL, nkeys, skey);
611 
612  while (HeapTupleIsValid(tup = systable_getnext(scan)))
613  {
615  SubscriptionRelState *relstate;
616  Datum d;
617  bool isnull;
618 
619  subrel = (Form_pg_subscription_rel) GETSTRUCT(tup);
620 
621  relstate = (SubscriptionRelState *) palloc(sizeof(SubscriptionRelState));
622  relstate->relid = subrel->srrelid;
623  relstate->state = subrel->srsubstate;
625  Anum_pg_subscription_rel_srsublsn, &isnull);
626  if (isnull)
627  relstate->lsn = InvalidXLogRecPtr;
628  else
629  relstate->lsn = DatumGetLSN(d);
630 
631  res = lappend(res, relstate);
632  }
633 
634  /* Cleanup */
635  systable_endscan(scan);
637 
638  return res;
639 }
#define DatumGetArrayTypeP(X)
Definition: array.h:254
void deconstruct_array(ArrayType *array, Oid elmtype, int elmlen, bool elmbyval, char elmalign, Datum **elemsp, bool **nullsp, int *nelemsp)
Definition: arrayfuncs.c:3491
static Datum values[MAXATTR]
Definition: bootstrap.c:156
#define TextDatumGetCString(d)
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int errcode(int sqlerrcode)
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int errmsg(const char *fmt,...)
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#define elog(elevel,...)
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#define ereport(elevel,...)
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Definition: genam.c:598
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:505
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:386
Oid MyDatabaseId
Definition: globals.c:89
HeapTuple heap_getnext(TableScanDesc sscan, ScanDirection direction)
Definition: heapam.c:1296
HeapTuple heap_form_tuple(TupleDesc tupleDescriptor, Datum *values, bool *isnull)
Definition: heaptuple.c:1020
HeapTuple heap_modify_tuple(HeapTuple tuple, TupleDesc tupleDesc, Datum *replValues, bool *replIsnull, bool *doReplace)
Definition: heaptuple.c:1113
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#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define GETSTRUCT(TUP)
Definition: htup_details.h:649
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Definition: indexing.c:301
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Definition: indexing.c:221
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int i
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Assert(fmt[strlen(fmt) - 1] !='\n')
List * lappend(List *list, void *datum)
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Definition: list.c:1519
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Definition: lmgr.c:1046
#define NoLock
Definition: lockdefs.h:34
#define AccessShareLock
Definition: lockdefs.h:36
#define RowExclusiveLock
Definition: lockdefs.h:38
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Definition: mcxt.c:1175
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Definition: mcxt.c:1068
#define NIL
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#define LSNGetDatum(X)
Definition: pg_lsn.h:22
#define DatumGetLSN(X)
Definition: pg_lsn.h:21
int CountDBSubscriptions(Oid dbid)
void FreeSubscription(Subscription *sub)
List * GetSubscriptionRelations(Oid subid)
void DisableSubscription(Oid subid)
List * GetSubscriptionNotReadyRelations(Oid subid)
void RemoveSubscriptionRel(Oid subid, Oid relid)
char GetSubscriptionRelState(Oid subid, Oid relid, XLogRecPtr *sublsn)
Subscription * GetSubscription(Oid subid, bool missing_ok)
void UpdateSubscriptionRelState(Oid subid, Oid relid, char state, XLogRecPtr sublsn)
static List * textarray_to_stringlist(ArrayType *textarray)
bool HasSubscriptionRelations(Oid subid)
Oid get_subscription_oid(const char *subname, bool missing_ok)
void AddSubscriptionRelState(Oid subid, Oid relid, char state, XLogRecPtr sublsn)
char * get_subscription_name(Oid subid, bool missing_ok)
NameData subname
FormData_pg_subscription * Form_pg_subscription
FormData_pg_subscription_rel * Form_pg_subscription_rel
#define CStringGetDatum(X)
Definition: postgres.h:622
uintptr_t Datum
Definition: postgres.h:411
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define BoolGetDatum(X)
Definition: postgres.h:446
#define CharGetDatum(X)
Definition: postgres.h:460
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unsigned int Oid
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@ ForwardScanDirection
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HeapTuple SearchSysCache1(int cacheId, Datum key1)
Definition: syscache.c:1173
Datum SysCacheGetAttr(int cacheId, HeapTuple tup, AttrNumber attributeNumber, bool *isNull)
Definition: syscache.c:1434
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:1184
#define SearchSysCacheCopy1(cacheId, key1)
Definition: syscache.h:179
#define SearchSysCacheCopy2(cacheId, key1, key2)
Definition: syscache.h:181
@ SUBSCRIPTIONNAME
Definition: syscache.h:98
@ SUBSCRIPTIONRELMAP
Definition: syscache.h:100
@ SUBSCRIPTIONOID
Definition: syscache.h:99
#define GetSysCacheOid2(cacheId, oidcol, key1, key2)
Definition: syscache.h:199
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
TableScanDesc table_beginscan_catalog(Relation relation, int nkeys, struct ScanKeyData *key)
Definition: tableam.c:112
static void table_endscan(TableScanDesc scan)
Definition: tableam.h:993
String * makeString(char *str)
Definition: value.c:63
uint64 XLogRecPtr
Definition: xlogdefs.h:21
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28