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pgoutput.c
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1 /*-------------------------------------------------------------------------
2  *
3  * pgoutput.c
4  * Logical Replication output plugin
5  *
6  * Copyright (c) 2012-2015, 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/memutils.h"
25 #include "utils/syscache.h"
26 #include "utils/varlena.h"
27 
29 
31 
33  OutputPluginOptions *opt, bool is_init);
34 static void pgoutput_shutdown(LogicalDecodingContext * ctx);
36  ReorderBufferTXN *txn);
38  ReorderBufferTXN *txn, XLogRecPtr commit_lsn);
40  ReorderBufferTXN *txn, Relation rel,
41  ReorderBufferChange *change);
43  RepOriginId origin_id);
44 
45 static bool publications_valid;
46 
47 static List *LoadPublications(List *pubnames);
48 static void publication_invalidation_cb(Datum arg, int cacheid,
49  uint32 hashvalue);
50 
51 /* Entry in the map used to remember which relation schemas we sent. */
52 typedef struct RelationSyncEntry
53 {
54  Oid relid; /* relation oid */
55  bool schema_sent; /* did we send the schema? */
59 
60 /* Map used to remember which relation schemas we sent. */
62 
63 static void init_rel_sync_cache(MemoryContext decoding_context);
65 static void rel_sync_cache_relation_cb(Datum arg, Oid relid);
66 static void rel_sync_cache_publication_cb(Datum arg, int cacheid,
67  uint32 hashvalue);
68 
69 /*
70  * Specify output plugin callbacks
71  */
72 void
74 {
76 
83 }
84 
85 static void
87  List **publication_names)
88 {
89  ListCell *lc;
90  bool protocol_version_given = false;
91  bool publication_names_given = false;
92 
93  foreach(lc, options)
94  {
95  DefElem *defel = (DefElem *) lfirst(lc);
96 
97  Assert(defel->arg == NULL || IsA(defel->arg, String));
98 
99  /* Check each param, whether or not we recognise it */
100  if (strcmp(defel->defname, "proto_version") == 0)
101  {
102  int64 parsed;
103 
104  if (protocol_version_given)
105  ereport(ERROR,
106  (errcode(ERRCODE_SYNTAX_ERROR),
107  errmsg("conflicting or redundant options")));
108  protocol_version_given = true;
109 
110  if (!scanint8(strVal(defel->arg), true, &parsed))
111  ereport(ERROR,
112  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
113  errmsg("invalid proto_version")));
114 
115  if (parsed > PG_UINT32_MAX || parsed < 0)
116  ereport(ERROR,
117  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
118  errmsg("proto_verson \"%s\" out of range",
119  strVal(defel->arg))));
120 
121  *protocol_version = (uint32) parsed;
122  }
123  else if (strcmp(defel->defname, "publication_names") == 0)
124  {
125  if (publication_names_given)
126  ereport(ERROR,
127  (errcode(ERRCODE_SYNTAX_ERROR),
128  errmsg("conflicting or redundant options")));
129  publication_names_given = true;
130 
131  if (!SplitIdentifierString(strVal(defel->arg), ',',
132  publication_names))
133  ereport(ERROR,
134  (errcode(ERRCODE_INVALID_NAME),
135  errmsg("invalid publication_names syntax")));
136  }
137  else
138  elog(ERROR, "unrecognized pgoutput option: %s", defel->defname);
139  }
140 }
141 
142 /*
143  * Initialize this plugin
144  */
145 static void
147  bool is_init)
148 {
149  PGOutputData *data = palloc0(sizeof(PGOutputData));
150 
151  /* Create our memory context for private allocations. */
153  "logical replication output context",
157 
158  ctx->output_plugin_private = data;
159 
160  /* This plugin uses binary protocol. */
162 
163  /*
164  * This is replication start and not slot initialization.
165  *
166  * Parse and validate options passed by the client.
167  */
168  if (!is_init)
169  {
170  /* Parse the params and ERROR if we see any we don't recognise */
172  &data->protocol_version,
173  &data->publication_names);
174 
175  /* Check if we support requested protocol */
177  ereport(ERROR,
178  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
179  errmsg("client sent proto_version=%d but we only support protocol %d or lower",
181 
183  ereport(ERROR,
184  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
185  errmsg("client sent proto_version=%d but we only support protocol %d or higher",
187 
188  if (list_length(data->publication_names) < 1)
189  ereport(ERROR,
190  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
191  errmsg("publication_names parameter missing")));
192 
193  /* Init publication state. */
194  data->publications = NIL;
195  publications_valid = false;
198  (Datum) 0);
199 
200  /* Initialize relation schema cache. */
202  }
203 }
204 
205 /*
206  * BEGIN callback
207  */
208 static void
210 {
211  bool send_replication_origin = txn->origin_id != InvalidRepOriginId;
212 
213  OutputPluginPrepareWrite(ctx, !send_replication_origin);
214  logicalrep_write_begin(ctx->out, txn);
215 
216  if (send_replication_origin)
217  {
218  char *origin;
219 
220  /* Message boundary */
221  OutputPluginWrite(ctx, false);
222  OutputPluginPrepareWrite(ctx, true);
223 
224  /*
225  * XXX: which behaviour we want here?
226  *
227  * Alternatives:
228  * - don't send origin message if origin name not found
229  * (that's what we do now)
230  * - throw error - that will break replication, not good
231  * - send some special "unknown" origin
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 {
247  OutputPluginPrepareWrite(ctx, true);
248  logicalrep_write_commit(ctx->out, txn, commit_lsn);
249  OutputPluginWrite(ctx, true);
250 }
251 
252 /*
253  * Sends the decoded DML over wire.
254  */
255 static void
257  Relation relation, ReorderBufferChange *change)
258 {
260  MemoryContext old;
261  RelationSyncEntry *relentry;
262 
263  relentry = get_rel_sync_entry(data, RelationGetRelid(relation));
264 
265  /* First check the table filter */
266  switch (change->action)
267  {
269  if (!relentry->pubactions.pubinsert)
270  return;
271  break;
273  if (!relentry->pubactions.pubupdate)
274  return;
275  break;
277  if (!relentry->pubactions.pubdelete)
278  return;
279  break;
280  default:
281  Assert(false);
282  }
283 
284  /* Avoid leaking memory by using and resetting our own context */
285  old = MemoryContextSwitchTo(data->context);
286 
287  /*
288  * Write the relation schema if the current schema haven't been sent yet.
289  */
290  if (!relentry->schema_sent)
291  {
292  TupleDesc desc;
293  int i;
294 
295  desc = RelationGetDescr(relation);
296 
297  /*
298  * Write out type info if needed. We do that only for user created
299  * types.
300  */
301  for (i = 0; i < desc->natts; i++)
302  {
303  Form_pg_attribute att = desc->attrs[i];
304 
305  if (att->attisdropped)
306  continue;
307 
308  if (att->atttypid < FirstNormalObjectId)
309  continue;
310 
311  OutputPluginPrepareWrite(ctx, false);
312  logicalrep_write_typ(ctx->out, att->atttypid);
313  OutputPluginWrite(ctx, false);
314  }
315 
316  OutputPluginPrepareWrite(ctx, false);
317  logicalrep_write_rel(ctx->out, relation);
318  OutputPluginWrite(ctx, false);
319  relentry->schema_sent = true;
320  }
321 
322  /* Send the data */
323  switch (change->action)
324  {
326  OutputPluginPrepareWrite(ctx, true);
327  logicalrep_write_insert(ctx->out, relation,
328  &change->data.tp.newtuple->tuple);
329  OutputPluginWrite(ctx, true);
330  break;
332  {
333  HeapTuple oldtuple = change->data.tp.oldtuple ?
334  &change->data.tp.oldtuple->tuple : NULL;
335 
336  OutputPluginPrepareWrite(ctx, true);
337  logicalrep_write_update(ctx->out, relation, oldtuple,
338  &change->data.tp.newtuple->tuple);
339  OutputPluginWrite(ctx, true);
340  break;
341  }
343  if (change->data.tp.oldtuple)
344  {
345  OutputPluginPrepareWrite(ctx, true);
346  logicalrep_write_delete(ctx->out, relation,
347  &change->data.tp.oldtuple->tuple);
348  OutputPluginWrite(ctx, true);
349  }
350  else
351  elog(DEBUG1, "didn't send DELETE change because of missing oldtuple");
352  break;
353  default:
354  Assert(false);
355  }
356 
357  /* Cleanup */
360 }
361 
362 /*
363  * Currently we always forward.
364  */
365 static bool
367  RepOriginId origin_id)
368 {
369  return false;
370 }
371 
372 /*
373  * Shutdown the output plugin.
374  *
375  * Note, we don't need to clean the data->context as it's child context
376  * of the ctx->context so it will be cleaned up by logical decoding machinery.
377  */
378 static void
380 {
381  if (RelationSyncCache)
382  {
383  hash_destroy(RelationSyncCache);
384  RelationSyncCache = NULL;
385  }
386 }
387 
388 /*
389  * Load publications from the list of publication names.
390  */
391 static List *
393 {
394  List *result = NIL;
395  ListCell *lc;
396 
397  foreach (lc, pubnames)
398  {
399  char *pubname = (char *) lfirst(lc);
400  Publication *pub = GetPublicationByName(pubname, false);
401 
402  result = lappend(result, pub);
403  }
404 
405  return result;
406 }
407 
408 /*
409  * Publication cache invalidation callback.
410  */
411 static void
412 publication_invalidation_cb(Datum arg, int cacheid, uint32 hashvalue)
413 {
414  publications_valid = false;
415 
416  /*
417  * Also invalidate per-relation cache so that next time the filtering
418  * info is checked it will be updated with the new publication
419  * settings.
420  */
421  rel_sync_cache_publication_cb(arg, cacheid, hashvalue);
422 }
423 
424 /*
425  * Initialize the relation schema sync cache for a decoding session.
426  *
427  * The hash table is destroyed at the end of a decoding session. While
428  * relcache invalidations still exist and will still be invoked, they
429  * will just see the null hash table global and take no action.
430  */
431 static void
433 {
434  HASHCTL ctl;
435  MemoryContext old_ctxt;
436 
437  if (RelationSyncCache != NULL)
438  return;
439 
440  /* Make a new hash table for the cache */
441  MemSet(&ctl, 0, sizeof(ctl));
442  ctl.keysize = sizeof(Oid);
443  ctl.entrysize = sizeof(RelationSyncEntry);
444  ctl.hcxt = cachectx;
445 
446  old_ctxt = MemoryContextSwitchTo(cachectx);
447  RelationSyncCache = hash_create("logical replication output relation cache",
448  128, &ctl,
450  (void) MemoryContextSwitchTo(old_ctxt);
451 
452  Assert(RelationSyncCache != NULL);
453 
457  (Datum) 0);
458 }
459 
460 /*
461  * Find or create entry in the relation schema cache.
462  */
463 static RelationSyncEntry *
465 {
466  RelationSyncEntry *entry;
467  bool found;
468  MemoryContext oldctx;
469 
470  Assert(RelationSyncCache != NULL);
471 
472  /* Find cached function info, creating if not found */
474  entry = (RelationSyncEntry *) hash_search(RelationSyncCache,
475  (void *) &relid,
476  HASH_ENTER, &found);
477  MemoryContextSwitchTo(oldctx);
478  Assert(entry != NULL);
479 
480  /* Not found means schema wasn't sent */
481  if (!found || !entry->replicate_valid)
482  {
483  List *pubids = GetRelationPublications(relid);
484  ListCell *lc;
485 
486  /* Reload publications if needed before use. */
487  if (!publications_valid)
488  {
490  if (data->publications)
492 
494  MemoryContextSwitchTo(oldctx);
495  publications_valid = true;
496  }
497 
498  /*
499  * Build publication cache. We can't use one provided by relcache
500  * as relcache considers all publications given relation is in, but
501  * here we only need to consider ones that the subscriber requested.
502  */
503  entry->pubactions.pubinsert = entry->pubactions.pubupdate =
504  entry->pubactions.pubdelete = false;
505 
506  foreach(lc, data->publications)
507  {
508  Publication *pub = lfirst(lc);
509 
510  if (pub->alltables || list_member_oid(pubids, pub->oid))
511  {
512  entry->pubactions.pubinsert |= pub->pubactions.pubinsert;
513  entry->pubactions.pubupdate |= pub->pubactions.pubupdate;
514  entry->pubactions.pubdelete |= pub->pubactions.pubdelete;
515  }
516 
517  if (entry->pubactions.pubinsert && entry->pubactions.pubupdate &&
518  entry->pubactions.pubdelete)
519  break;
520  }
521 
522  list_free(pubids);
523 
524  entry->replicate_valid = true;
525  }
526 
527  if (!found)
528  entry->schema_sent = false;
529 
530  return entry;
531 }
532 
533 /*
534  * Relcache invalidation callback
535  */
536 static void
538 {
539  RelationSyncEntry *entry;
540 
541  /*
542  * We can get here if the plugin was used in SQL interface as the
543  * RelSchemaSyncCache is destroyed when the decoding finishes, but there
544  * is no way to unregister the relcache invalidation callback.
545  */
546  if (RelationSyncCache == NULL)
547  return;
548 
549  /*
550  * Nobody keeps pointers to entries in this hash table around outside
551  * logical decoding callback calls - but invalidation events can come in
552  * *during* a callback if we access the relcache in the callback. Because
553  * of that we must mark the cache entry as invalid but not remove it from
554  * the hash while it could still be referenced, then prune it at a later
555  * safe point.
556  *
557  * Getting invalidations for relations that aren't in the table is
558  * entirely normal, since there's no way to unregister for an
559  * invalidation event. So we don't care if it's found or not.
560  */
561  entry = (RelationSyncEntry *) hash_search(RelationSyncCache, &relid,
562  HASH_FIND, NULL);
563 
564  /*
565  * Reset schema sent status as the relation definition may have
566  * changed.
567  */
568  if (entry != NULL)
569  entry->schema_sent = false;
570 }
571 
572 /*
573  * Publication relation map syscache invalidation callback
574  */
575 static void
577 {
579  RelationSyncEntry *entry;
580 
581  /*
582  * We can get here if the plugin was used in SQL interface as the
583  * RelSchemaSyncCache is destroyed when the decoding finishes, but there
584  * is no way to unregister the relcache invalidation callback.
585  */
586  if (RelationSyncCache == NULL)
587  return;
588 
589  /*
590  * There is no way to find which entry in our cache the hash belongs to
591  * so mark the whole cache as invalid.
592  */
593  hash_seq_init(&status, RelationSyncCache);
594  while ((entry = (RelationSyncEntry *) hash_seq_search(&status)) != NULL)
595  entry->replicate_valid = false;
596 }
#define NIL
Definition: pg_list.h:69
#define LOGICALREP_PROTO_VERSION_NUM
Definition: logicalproto.h:28
void logicalrep_write_typ(StringInfo out, Oid typoid)
Definition: proto.c:349
static void pgoutput_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn, Relation rel, ReorderBufferChange *change)
Definition: pgoutput.c:256
PublicationActions pubactions
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Definition: dynahash.c:793
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Definition: nodes.h:560
#define DEBUG1
Definition: elog.h:25
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bool replicate_valid
Definition: pgoutput.c:56
#define HASH_CONTEXT
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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: hsearch.h:78
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Definition: pgoutput.h:20
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Definition: pgoutput.c:379
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Definition: pgoutput.c:244
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Size entrysize
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union ReorderBufferChange::@49 data
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#define PG_UINT32_MAX
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Definition: origin.c:398
unsigned int Oid
Definition: postgres_ext.h:31
struct RelationSyncEntry RelationSyncEntry
static void rel_sync_cache_publication_cb(Datum arg, int cacheid, uint32 hashvalue)
Definition: pgoutput.c:576
enum ReorderBufferChangeType action
Definition: reorderbuffer.h:77
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Definition: pgoutput.c:146
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Definition: proto.c:252
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:184
unsigned int uint32
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