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pgoutput.c
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1 /*-------------------------------------------------------------------------
2  *
3  * pgoutput.c
4  * Logical Replication output plugin
5  *
6  * Copyright (c) 2012-2018, PostgreSQL Global Development Group
7  *
8  * IDENTIFICATION
9  * src/backend/replication/pgoutput/pgoutput.c
10  *
11  *-------------------------------------------------------------------------
12  */
13 #include "postgres.h"
14 
15 #include "catalog/pg_publication.h"
16 
17 #include "replication/logical.h"
19 #include "replication/origin.h"
20 #include "replication/pgoutput.h"
21 
22 #include "utils/inval.h"
23 #include "utils/int8.h"
24 #include "utils/lsyscache.h"
25 #include "utils/memutils.h"
26 #include "utils/syscache.h"
27 #include "utils/varlena.h"
28 
30 
32 
34  OutputPluginOptions *opt, bool is_init);
37  ReorderBufferTXN *txn);
39  ReorderBufferTXN *txn, XLogRecPtr commit_lsn);
41  ReorderBufferTXN *txn, Relation rel,
42  ReorderBufferChange *change);
44  RepOriginId origin_id);
45 
46 static bool publications_valid;
47 
48 static List *LoadPublications(List *pubnames);
49 static void publication_invalidation_cb(Datum arg, int cacheid,
50  uint32 hashvalue);
51 
52 /* Entry in the map used to remember which relation schemas we sent. */
53 typedef struct RelationSyncEntry
54 {
55  Oid relid; /* relation oid */
56  bool schema_sent; /* did we send the schema? */
60 
61 /* Map used to remember which relation schemas we sent. */
62 static HTAB *RelationSyncCache = NULL;
63 
64 static void init_rel_sync_cache(MemoryContext decoding_context);
67 static void rel_sync_cache_publication_cb(Datum arg, int cacheid,
68  uint32 hashvalue);
69 
70 /*
71  * Specify output plugin callbacks
72  */
73 void
75 {
77 
84 }
85 
86 static void
88  List **publication_names)
89 {
90  ListCell *lc;
91  bool protocol_version_given = false;
92  bool publication_names_given = false;
93 
94  foreach(lc, options)
95  {
96  DefElem *defel = (DefElem *) lfirst(lc);
97 
98  Assert(defel->arg == NULL || IsA(defel->arg, String));
99 
100  /* Check each param, whether or not we recognize it */
101  if (strcmp(defel->defname, "proto_version") == 0)
102  {
103  int64 parsed;
104 
105  if (protocol_version_given)
106  ereport(ERROR,
107  (errcode(ERRCODE_SYNTAX_ERROR),
108  errmsg("conflicting or redundant options")));
109  protocol_version_given = true;
110 
111  if (!scanint8(strVal(defel->arg), true, &parsed))
112  ereport(ERROR,
113  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
114  errmsg("invalid proto_version")));
115 
116  if (parsed > PG_UINT32_MAX || parsed < 0)
117  ereport(ERROR,
118  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
119  errmsg("proto_version \"%s\" out of range",
120  strVal(defel->arg))));
121 
122  *protocol_version = (uint32) parsed;
123  }
124  else if (strcmp(defel->defname, "publication_names") == 0)
125  {
126  if (publication_names_given)
127  ereport(ERROR,
128  (errcode(ERRCODE_SYNTAX_ERROR),
129  errmsg("conflicting or redundant options")));
130  publication_names_given = true;
131 
132  if (!SplitIdentifierString(strVal(defel->arg), ',',
133  publication_names))
134  ereport(ERROR,
135  (errcode(ERRCODE_INVALID_NAME),
136  errmsg("invalid publication_names syntax")));
137  }
138  else
139  elog(ERROR, "unrecognized pgoutput option: %s", defel->defname);
140  }
141 }
142 
143 /*
144  * Initialize this plugin
145  */
146 static void
148  bool is_init)
149 {
150  PGOutputData *data = palloc0(sizeof(PGOutputData));
151 
152  /* Create our memory context for private allocations. */
154  "logical replication output context",
156 
157  ctx->output_plugin_private = data;
158 
159  /* This plugin uses binary protocol. */
161 
162  /*
163  * This is replication start and not slot initialization.
164  *
165  * Parse and validate options passed by the client.
166  */
167  if (!is_init)
168  {
169  /* Parse the params and ERROR if we see any we don't recognize */
171  &data->protocol_version,
172  &data->publication_names);
173 
174  /* Check if we support requested protocol */
176  ereport(ERROR,
177  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
178  errmsg("client sent proto_version=%d but we only support protocol %d or lower",
180 
182  ereport(ERROR,
183  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
184  errmsg("client sent proto_version=%d but we only support protocol %d or higher",
186 
187  if (list_length(data->publication_names) < 1)
188  ereport(ERROR,
189  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
190  errmsg("publication_names parameter missing")));
191 
192  /* Init publication state. */
193  data->publications = NIL;
194  publications_valid = false;
197  (Datum) 0);
198 
199  /* Initialize relation schema cache. */
201  }
202 }
203 
204 /*
205  * BEGIN callback
206  */
207 static void
209 {
210  bool send_replication_origin = txn->origin_id != InvalidRepOriginId;
211 
212  OutputPluginPrepareWrite(ctx, !send_replication_origin);
213  logicalrep_write_begin(ctx->out, txn);
214 
215  if (send_replication_origin)
216  {
217  char *origin;
218 
219  /* Message boundary */
220  OutputPluginWrite(ctx, false);
221  OutputPluginPrepareWrite(ctx, true);
222 
223  /*----------
224  * XXX: which behaviour do we want here?
225  *
226  * Alternatives:
227  * - don't send origin message if origin name not found
228  * (that's what we do now)
229  * - throw error - that will break replication, not good
230  * - send some special "unknown" origin
231  *----------
232  */
233  if (replorigin_by_oid(txn->origin_id, true, &origin))
234  logicalrep_write_origin(ctx->out, origin, txn->origin_lsn);
235  }
236 
237  OutputPluginWrite(ctx, true);
238 }
239 
240 /*
241  * COMMIT callback
242  */
243 static void
245  XLogRecPtr commit_lsn)
246 {
248 
249  OutputPluginPrepareWrite(ctx, true);
250  logicalrep_write_commit(ctx->out, txn, commit_lsn);
251  OutputPluginWrite(ctx, true);
252 }
253 
254 /*
255  * Sends the decoded DML over wire.
256  */
257 static void
259  Relation relation, ReorderBufferChange *change)
260 {
262  MemoryContext old;
263  RelationSyncEntry *relentry;
264 
265  relentry = get_rel_sync_entry(data, RelationGetRelid(relation));
266 
267  /* First check the table filter */
268  switch (change->action)
269  {
271  if (!relentry->pubactions.pubinsert)
272  return;
273  break;
275  if (!relentry->pubactions.pubupdate)
276  return;
277  break;
279  if (!relentry->pubactions.pubdelete)
280  return;
281  break;
282  default:
283  Assert(false);
284  }
285 
286  /* Avoid leaking memory by using and resetting our own context */
287  old = MemoryContextSwitchTo(data->context);
288 
289  /*
290  * Write the relation schema if the current schema haven't been sent yet.
291  */
292  if (!relentry->schema_sent)
293  {
294  TupleDesc desc;
295  int i;
296 
297  desc = RelationGetDescr(relation);
298 
299  /*
300  * Write out type info if needed. We do that only for user created
301  * types.
302  */
303  for (i = 0; i < desc->natts; i++)
304  {
305  Form_pg_attribute att = TupleDescAttr(desc, i);
306 
307  if (att->attisdropped)
308  continue;
309 
310  if (att->atttypid < FirstNormalObjectId)
311  continue;
312 
313  OutputPluginPrepareWrite(ctx, false);
314  logicalrep_write_typ(ctx->out, att->atttypid);
315  OutputPluginWrite(ctx, false);
316  }
317 
318  OutputPluginPrepareWrite(ctx, false);
319  logicalrep_write_rel(ctx->out, relation);
320  OutputPluginWrite(ctx, false);
321  relentry->schema_sent = true;
322  }
323 
324  /* Send the data */
325  switch (change->action)
326  {
328  OutputPluginPrepareWrite(ctx, true);
329  logicalrep_write_insert(ctx->out, relation,
330  &change->data.tp.newtuple->tuple);
331  OutputPluginWrite(ctx, true);
332  break;
334  {
335  HeapTuple oldtuple = change->data.tp.oldtuple ?
336  &change->data.tp.oldtuple->tuple : NULL;
337 
338  OutputPluginPrepareWrite(ctx, true);
339  logicalrep_write_update(ctx->out, relation, oldtuple,
340  &change->data.tp.newtuple->tuple);
341  OutputPluginWrite(ctx, true);
342  break;
343  }
345  if (change->data.tp.oldtuple)
346  {
347  OutputPluginPrepareWrite(ctx, true);
348  logicalrep_write_delete(ctx->out, relation,
349  &change->data.tp.oldtuple->tuple);
350  OutputPluginWrite(ctx, true);
351  }
352  else
353  elog(DEBUG1, "didn't send DELETE change because of missing oldtuple");
354  break;
355  default:
356  Assert(false);
357  }
358 
359  /* Cleanup */
362 }
363 
364 /*
365  * Currently we always forward.
366  */
367 static bool
369  RepOriginId origin_id)
370 {
371  return false;
372 }
373 
374 /*
375  * Shutdown the output plugin.
376  *
377  * Note, we don't need to clean the data->context as it's child context
378  * of the ctx->context so it will be cleaned up by logical decoding machinery.
379  */
380 static void
382 {
383  if (RelationSyncCache)
384  {
385  hash_destroy(RelationSyncCache);
386  RelationSyncCache = NULL;
387  }
388 }
389 
390 /*
391  * Load publications from the list of publication names.
392  */
393 static List *
395 {
396  List *result = NIL;
397  ListCell *lc;
398 
399  foreach(lc, pubnames)
400  {
401  char *pubname = (char *) lfirst(lc);
402  Publication *pub = GetPublicationByName(pubname, false);
403 
404  result = lappend(result, pub);
405  }
406 
407  return result;
408 }
409 
410 /*
411  * Publication cache invalidation callback.
412  */
413 static void
414 publication_invalidation_cb(Datum arg, int cacheid, uint32 hashvalue)
415 {
416  publications_valid = false;
417 
418  /*
419  * Also invalidate per-relation cache so that next time the filtering info
420  * is checked it will be updated with the new publication settings.
421  */
422  rel_sync_cache_publication_cb(arg, cacheid, hashvalue);
423 }
424 
425 /*
426  * Initialize the relation schema sync cache for a decoding session.
427  *
428  * The hash table is destroyed at the end of a decoding session. While
429  * relcache invalidations still exist and will still be invoked, they
430  * will just see the null hash table global and take no action.
431  */
432 static void
434 {
435  HASHCTL ctl;
436  MemoryContext old_ctxt;
437 
438  if (RelationSyncCache != NULL)
439  return;
440 
441  /* Make a new hash table for the cache */
442  MemSet(&ctl, 0, sizeof(ctl));
443  ctl.keysize = sizeof(Oid);
444  ctl.entrysize = sizeof(RelationSyncEntry);
445  ctl.hcxt = cachectx;
446 
447  old_ctxt = MemoryContextSwitchTo(cachectx);
448  RelationSyncCache = hash_create("logical replication output relation cache",
449  128, &ctl,
451  (void) MemoryContextSwitchTo(old_ctxt);
452 
453  Assert(RelationSyncCache != NULL);
454 
458  (Datum) 0);
459 }
460 
461 /*
462  * Find or create entry in the relation schema cache.
463  */
464 static RelationSyncEntry *
466 {
467  RelationSyncEntry *entry;
468  bool found;
469  MemoryContext oldctx;
470 
471  Assert(RelationSyncCache != NULL);
472 
473  /* Find cached function info, creating if not found */
475  entry = (RelationSyncEntry *) hash_search(RelationSyncCache,
476  (void *) &relid,
477  HASH_ENTER, &found);
478  MemoryContextSwitchTo(oldctx);
479  Assert(entry != NULL);
480 
481  /* Not found means schema wasn't sent */
482  if (!found || !entry->replicate_valid)
483  {
484  List *pubids = GetRelationPublications(relid);
485  ListCell *lc;
486 
487  /* Reload publications if needed before use. */
488  if (!publications_valid)
489  {
491  if (data->publications)
493 
495  MemoryContextSwitchTo(oldctx);
496  publications_valid = true;
497  }
498 
499  /*
500  * Build publication cache. We can't use one provided by relcache as
501  * relcache considers all publications given relation is in, but here
502  * we only need to consider ones that the subscriber requested.
503  */
504  entry->pubactions.pubinsert = entry->pubactions.pubupdate =
505  entry->pubactions.pubdelete = false;
506 
507  foreach(lc, data->publications)
508  {
509  Publication *pub = lfirst(lc);
510 
511  /*
512  * Skip tables that look like they are from a heap rewrite (see
513  * make_new_heap()). We need to skip them because the subscriber
514  * won't have a table by that name to receive the data. That
515  * means we won't ship the new data in, say, an added column with
516  * a DEFAULT, but if the user applies the same DDL manually on the
517  * subscriber, then this will work out for them.
518  *
519  * We only need to consider the alltables case, because such a
520  * transient heap won't be an explicit member of a publication.
521  */
522  if (pub->alltables)
523  {
524  char *relname = get_rel_name(relid);
525  unsigned int u;
526  int n;
527 
528  if (sscanf(relname, "pg_temp_%u%n", &u, &n) == 1 &&
529  relname[n] == '\0')
530  {
532  break;
533  }
534  }
535 
536  if (pub->alltables || list_member_oid(pubids, pub->oid))
537  {
538  entry->pubactions.pubinsert |= pub->pubactions.pubinsert;
539  entry->pubactions.pubupdate |= pub->pubactions.pubupdate;
540  entry->pubactions.pubdelete |= pub->pubactions.pubdelete;
541  }
542 
543  if (entry->pubactions.pubinsert && entry->pubactions.pubupdate &&
544  entry->pubactions.pubdelete)
545  break;
546  }
547 
548  list_free(pubids);
549 
550  entry->replicate_valid = true;
551  }
552 
553  if (!found)
554  entry->schema_sent = false;
555 
556  return entry;
557 }
558 
559 /*
560  * Relcache invalidation callback
561  */
562 static void
564 {
565  RelationSyncEntry *entry;
566 
567  /*
568  * We can get here if the plugin was used in SQL interface as the
569  * RelSchemaSyncCache is destroyed when the decoding finishes, but there
570  * is no way to unregister the relcache invalidation callback.
571  */
572  if (RelationSyncCache == NULL)
573  return;
574 
575  /*
576  * Nobody keeps pointers to entries in this hash table around outside
577  * logical decoding callback calls - but invalidation events can come in
578  * *during* a callback if we access the relcache in the callback. Because
579  * of that we must mark the cache entry as invalid but not remove it from
580  * the hash while it could still be referenced, then prune it at a later
581  * safe point.
582  *
583  * Getting invalidations for relations that aren't in the table is
584  * entirely normal, since there's no way to unregister for an invalidation
585  * event. So we don't care if it's found or not.
586  */
587  entry = (RelationSyncEntry *) hash_search(RelationSyncCache, &relid,
588  HASH_FIND, NULL);
589 
590  /*
591  * Reset schema sent status as the relation definition may have changed.
592  */
593  if (entry != NULL)
594  entry->schema_sent = false;
595 }
596 
597 /*
598  * Publication relation map syscache invalidation callback
599  */
600 static void
602 {
604  RelationSyncEntry *entry;
605 
606  /*
607  * We can get here if the plugin was used in SQL interface as the
608  * RelSchemaSyncCache is destroyed when the decoding finishes, but there
609  * is no way to unregister the relcache invalidation callback.
610  */
611  if (RelationSyncCache == NULL)
612  return;
613 
614  /*
615  * There is no way to find which entry in our cache the hash belongs to so
616  * mark the whole cache as invalid.
617  */
618  hash_seq_init(&status, RelationSyncCache);
619  while ((entry = (RelationSyncEntry *) hash_seq_search(&status)) != NULL)
620  entry->replicate_valid = false;
621 }
#define NIL
Definition: pg_list.h:69
#define LOGICALREP_PROTO_VERSION_NUM
Definition: logicalproto.h:28
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Definition: proto.c:349
static void pgoutput_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn, Relation rel, ReorderBufferChange *change)
Definition: pgoutput.c:258
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Definition: pgoutput.c:46
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Definition: pgoutput.c:57
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#define HASH_ELEM
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static void publication_invalidation_cb(Datum arg, int cacheid, uint32 hashvalue)
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Definition: origin.c:434
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struct RelationSyncEntry RelationSyncEntry
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Definition: list.c:1147
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Definition: pg_attribute.h:187
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Definition: pgoutput.c:208
LogicalDecodeFilterByOriginCB filter_by_origin_cb
Definition: pg_list.h:45
char * get_rel_name(Oid relid)
Definition: lsyscache.c:1730
#define RelationGetRelid(relation)
Definition: rel.h:425
MemoryContext CacheMemoryContext
Definition: mcxt.c:46
PublicationActions pubactions
Definition: pgoutput.c:58
bool scanint8(const char *str, bool errorOK, int64 *result)
Definition: int8.c:55
#define AssertVariableIsOfType(varname, typename)
Definition: c.h:823
uint32 protocol_version
Definition: pgoutput.h:24