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ts_cache.c
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1 /*-------------------------------------------------------------------------
2  *
3  * ts_cache.c
4  * Tsearch related object caches.
5  *
6  * Tsearch performance is very sensitive to performance of parsers,
7  * dictionaries and mapping, so lookups should be cached as much
8  * as possible.
9  *
10  * Once a backend has created a cache entry for a particular TS object OID,
11  * the cache entry will exist for the life of the backend; hence it is
12  * safe to hold onto a pointer to the cache entry while doing things that
13  * might result in recognizing a cache invalidation. Beware however that
14  * subsidiary information might be deleted and reallocated somewhere else
15  * if a cache inval and reval happens! This does not look like it will be
16  * a big problem as long as parser and dictionary methods do not attempt
17  * any database access.
18  *
19  *
20  * Copyright (c) 2006-2022, PostgreSQL Global Development Group
21  *
22  * IDENTIFICATION
23  * src/backend/utils/cache/ts_cache.c
24  *
25  *-------------------------------------------------------------------------
26  */
27 #include "postgres.h"
28 
29 #include "access/genam.h"
30 #include "access/htup_details.h"
31 #include "access/table.h"
32 #include "access/xact.h"
33 #include "catalog/namespace.h"
34 #include "catalog/pg_ts_config.h"
36 #include "catalog/pg_ts_dict.h"
37 #include "catalog/pg_ts_parser.h"
38 #include "catalog/pg_ts_template.h"
39 #include "commands/defrem.h"
40 #include "miscadmin.h"
41 #include "tsearch/ts_cache.h"
42 #include "utils/builtins.h"
43 #include "utils/catcache.h"
44 #include "utils/fmgroids.h"
45 #include "utils/guc_hooks.h"
46 #include "utils/inval.h"
47 #include "utils/lsyscache.h"
48 #include "utils/memutils.h"
49 #include "utils/regproc.h"
50 #include "utils/syscache.h"
51 
52 
53 /*
54  * MAXTOKENTYPE/MAXDICTSPERTT are arbitrary limits on the workspace size
55  * used in lookup_ts_config_cache(). We could avoid hardwiring a limit
56  * by making the workspace dynamically enlargeable, but it seems unlikely
57  * to be worth the trouble.
58  */
59 #define MAXTOKENTYPE 256
60 #define MAXDICTSPERTT 100
61 
62 
63 static HTAB *TSParserCacheHash = NULL;
65 
66 static HTAB *TSDictionaryCacheHash = NULL;
68 
69 static HTAB *TSConfigCacheHash = NULL;
71 
72 /*
73  * GUC default_text_search_config, and a cache of the current config's OID
74  */
75 char *TSCurrentConfig = NULL;
76 
78 
79 
80 /*
81  * We use this syscache callback to detect when a visible change to a TS
82  * catalog entry has been made, by either our own backend or another one.
83  *
84  * In principle we could just flush the specific cache entry that changed,
85  * but given that TS configuration changes are probably infrequent, it
86  * doesn't seem worth the trouble to determine that; we just flush all the
87  * entries of the related hash table.
88  *
89  * We can use the same function for all TS caches by passing the hash
90  * table address as the "arg".
91  */
92 static void
93 InvalidateTSCacheCallBack(Datum arg, int cacheid, uint32 hashvalue)
94 {
97  TSAnyCacheEntry *entry;
98 
100  while ((entry = (TSAnyCacheEntry *) hash_seq_search(&status)) != NULL)
101  entry->isvalid = false;
102 
103  /* Also invalidate the current-config cache if it's pg_ts_config */
104  if (hash == TSConfigCacheHash)
106 }
107 
108 /*
109  * Fetch parser cache entry
110  */
113 {
114  TSParserCacheEntry *entry;
115 
116  if (TSParserCacheHash == NULL)
117  {
118  /* First time through: initialize the hash table */
119  HASHCTL ctl;
120 
121  ctl.keysize = sizeof(Oid);
122  ctl.entrysize = sizeof(TSParserCacheEntry);
123  TSParserCacheHash = hash_create("Tsearch parser cache", 4,
124  &ctl, HASH_ELEM | HASH_BLOBS);
125  /* Flush cache on pg_ts_parser changes */
128 
129  /* Also make sure CacheMemoryContext exists */
130  if (!CacheMemoryContext)
132  }
133 
134  /* Check single-entry cache */
135  if (lastUsedParser && lastUsedParser->prsId == prsId &&
137  return lastUsedParser;
138 
139  /* Try to look up an existing entry */
141  (void *) &prsId,
142  HASH_FIND, NULL);
143  if (entry == NULL || !entry->isvalid)
144  {
145  /*
146  * If we didn't find one, we want to make one. But first look up the
147  * object to be sure the OID is real.
148  */
149  HeapTuple tp;
150  Form_pg_ts_parser prs;
151 
153  if (!HeapTupleIsValid(tp))
154  elog(ERROR, "cache lookup failed for text search parser %u",
155  prsId);
156  prs = (Form_pg_ts_parser) GETSTRUCT(tp);
157 
158  /*
159  * Sanity checks
160  */
161  if (!OidIsValid(prs->prsstart))
162  elog(ERROR, "text search parser %u has no prsstart method", prsId);
163  if (!OidIsValid(prs->prstoken))
164  elog(ERROR, "text search parser %u has no prstoken method", prsId);
165  if (!OidIsValid(prs->prsend))
166  elog(ERROR, "text search parser %u has no prsend method", prsId);
167 
168  if (entry == NULL)
169  {
170  bool found;
171 
172  /* Now make the cache entry */
173  entry = (TSParserCacheEntry *)
175  (void *) &prsId,
176  HASH_ENTER, &found);
177  Assert(!found); /* it wasn't there a moment ago */
178  }
179 
180  MemSet(entry, 0, sizeof(TSParserCacheEntry));
181  entry->prsId = prsId;
182  entry->startOid = prs->prsstart;
183  entry->tokenOid = prs->prstoken;
184  entry->endOid = prs->prsend;
185  entry->headlineOid = prs->prsheadline;
186  entry->lextypeOid = prs->prslextype;
187 
188  ReleaseSysCache(tp);
189 
192  fmgr_info_cxt(entry->endOid, &entry->prsend, CacheMemoryContext);
193  if (OidIsValid(entry->headlineOid))
194  fmgr_info_cxt(entry->headlineOid, &entry->prsheadline,
196 
197  entry->isvalid = true;
198  }
199 
200  lastUsedParser = entry;
201 
202  return entry;
203 }
204 
205 /*
206  * Fetch dictionary cache entry
207  */
210 {
211  TSDictionaryCacheEntry *entry;
212 
213  if (TSDictionaryCacheHash == NULL)
214  {
215  /* First time through: initialize the hash table */
216  HASHCTL ctl;
217 
218  ctl.keysize = sizeof(Oid);
219  ctl.entrysize = sizeof(TSDictionaryCacheEntry);
220  TSDictionaryCacheHash = hash_create("Tsearch dictionary cache", 8,
221  &ctl, HASH_ELEM | HASH_BLOBS);
222  /* Flush cache on pg_ts_dict and pg_ts_template changes */
227 
228  /* Also make sure CacheMemoryContext exists */
229  if (!CacheMemoryContext)
231  }
232 
233  /* Check single-entry cache */
234  if (lastUsedDictionary && lastUsedDictionary->dictId == dictId &&
236  return lastUsedDictionary;
237 
238  /* Try to look up an existing entry */
240  (void *) &dictId,
241  HASH_FIND, NULL);
242  if (entry == NULL || !entry->isvalid)
243  {
244  /*
245  * If we didn't find one, we want to make one. But first look up the
246  * object to be sure the OID is real.
247  */
248  HeapTuple tpdict,
249  tptmpl;
250  Form_pg_ts_dict dict;
251  Form_pg_ts_template template;
252  MemoryContext saveCtx;
253 
254  tpdict = SearchSysCache1(TSDICTOID, ObjectIdGetDatum(dictId));
255  if (!HeapTupleIsValid(tpdict))
256  elog(ERROR, "cache lookup failed for text search dictionary %u",
257  dictId);
258  dict = (Form_pg_ts_dict) GETSTRUCT(tpdict);
259 
260  /*
261  * Sanity checks
262  */
263  if (!OidIsValid(dict->dicttemplate))
264  elog(ERROR, "text search dictionary %u has no template", dictId);
265 
266  /*
267  * Retrieve dictionary's template
268  */
270  ObjectIdGetDatum(dict->dicttemplate));
271  if (!HeapTupleIsValid(tptmpl))
272  elog(ERROR, "cache lookup failed for text search template %u",
273  dict->dicttemplate);
274  template = (Form_pg_ts_template) GETSTRUCT(tptmpl);
275 
276  /*
277  * Sanity checks
278  */
279  if (!OidIsValid(template->tmpllexize))
280  elog(ERROR, "text search template %u has no lexize method",
281  template->tmpllexize);
282 
283  if (entry == NULL)
284  {
285  bool found;
286 
287  /* Now make the cache entry */
288  entry = (TSDictionaryCacheEntry *)
290  (void *) &dictId,
291  HASH_ENTER, &found);
292  Assert(!found); /* it wasn't there a moment ago */
293 
294  /* Create private memory context the first time through */
296  "TS dictionary",
298  MemoryContextCopyAndSetIdentifier(saveCtx, NameStr(dict->dictname));
299  }
300  else
301  {
302  /* Clear the existing entry's private context */
303  saveCtx = entry->dictCtx;
304  /* Don't let context's ident pointer dangle while we reset it */
305  MemoryContextSetIdentifier(saveCtx, NULL);
306  MemoryContextReset(saveCtx);
307  MemoryContextCopyAndSetIdentifier(saveCtx, NameStr(dict->dictname));
308  }
309 
310  MemSet(entry, 0, sizeof(TSDictionaryCacheEntry));
311  entry->dictId = dictId;
312  entry->dictCtx = saveCtx;
313 
314  entry->lexizeOid = template->tmpllexize;
315 
316  if (OidIsValid(template->tmplinit))
317  {
318  List *dictoptions;
319  Datum opt;
320  bool isnull;
321  MemoryContext oldcontext;
322 
323  /*
324  * Init method runs in dictionary's private memory context, and we
325  * make sure the options are stored there too
326  */
327  oldcontext = MemoryContextSwitchTo(entry->dictCtx);
328 
329  opt = SysCacheGetAttr(TSDICTOID, tpdict,
330  Anum_pg_ts_dict_dictinitoption,
331  &isnull);
332  if (isnull)
333  dictoptions = NIL;
334  else
335  dictoptions = deserialize_deflist(opt);
336 
337  entry->dictData =
338  DatumGetPointer(OidFunctionCall1(template->tmplinit,
339  PointerGetDatum(dictoptions)));
340 
341  MemoryContextSwitchTo(oldcontext);
342  }
343 
344  ReleaseSysCache(tptmpl);
345  ReleaseSysCache(tpdict);
346 
347  fmgr_info_cxt(entry->lexizeOid, &entry->lexize, entry->dictCtx);
348 
349  entry->isvalid = true;
350  }
351 
352  lastUsedDictionary = entry;
353 
354  return entry;
355 }
356 
357 /*
358  * Initialize config cache and prepare callbacks. This is split out of
359  * lookup_ts_config_cache because we need to activate the callback before
360  * caching TSCurrentConfigCache, too.
361  */
362 static void
364 {
365  HASHCTL ctl;
366 
367  ctl.keysize = sizeof(Oid);
368  ctl.entrysize = sizeof(TSConfigCacheEntry);
369  TSConfigCacheHash = hash_create("Tsearch configuration cache", 16,
370  &ctl, HASH_ELEM | HASH_BLOBS);
371  /* Flush cache on pg_ts_config and pg_ts_config_map changes */
376 
377  /* Also make sure CacheMemoryContext exists */
378  if (!CacheMemoryContext)
380 }
381 
382 /*
383  * Fetch configuration cache entry
384  */
387 {
388  TSConfigCacheEntry *entry;
389 
390  if (TSConfigCacheHash == NULL)
391  {
392  /* First time through: initialize the hash table */
394  }
395 
396  /* Check single-entry cache */
397  if (lastUsedConfig && lastUsedConfig->cfgId == cfgId &&
399  return lastUsedConfig;
400 
401  /* Try to look up an existing entry */
403  (void *) &cfgId,
404  HASH_FIND, NULL);
405  if (entry == NULL || !entry->isvalid)
406  {
407  /*
408  * If we didn't find one, we want to make one. But first look up the
409  * object to be sure the OID is real.
410  */
411  HeapTuple tp;
412  Form_pg_ts_config cfg;
413  Relation maprel;
414  Relation mapidx;
415  ScanKeyData mapskey;
416  SysScanDesc mapscan;
417  HeapTuple maptup;
418  ListDictionary maplists[MAXTOKENTYPE + 1];
419  Oid mapdicts[MAXDICTSPERTT];
420  int maxtokentype;
421  int ndicts;
422  int i;
423 
425  if (!HeapTupleIsValid(tp))
426  elog(ERROR, "cache lookup failed for text search configuration %u",
427  cfgId);
428  cfg = (Form_pg_ts_config) GETSTRUCT(tp);
429 
430  /*
431  * Sanity checks
432  */
433  if (!OidIsValid(cfg->cfgparser))
434  elog(ERROR, "text search configuration %u has no parser", cfgId);
435 
436  if (entry == NULL)
437  {
438  bool found;
439 
440  /* Now make the cache entry */
441  entry = (TSConfigCacheEntry *)
443  (void *) &cfgId,
444  HASH_ENTER, &found);
445  Assert(!found); /* it wasn't there a moment ago */
446  }
447  else
448  {
449  /* Cleanup old contents */
450  if (entry->map)
451  {
452  for (i = 0; i < entry->lenmap; i++)
453  if (entry->map[i].dictIds)
454  pfree(entry->map[i].dictIds);
455  pfree(entry->map);
456  }
457  }
458 
459  MemSet(entry, 0, sizeof(TSConfigCacheEntry));
460  entry->cfgId = cfgId;
461  entry->prsId = cfg->cfgparser;
462 
463  ReleaseSysCache(tp);
464 
465  /*
466  * Scan pg_ts_config_map to gather dictionary list for each token type
467  *
468  * Because the index is on (mapcfg, maptokentype, mapseqno), we will
469  * see the entries in maptokentype order, and in mapseqno order for
470  * each token type, even though we didn't explicitly ask for that.
471  */
472  MemSet(maplists, 0, sizeof(maplists));
473  maxtokentype = 0;
474  ndicts = 0;
475 
476  ScanKeyInit(&mapskey,
477  Anum_pg_ts_config_map_mapcfg,
478  BTEqualStrategyNumber, F_OIDEQ,
479  ObjectIdGetDatum(cfgId));
480 
481  maprel = table_open(TSConfigMapRelationId, AccessShareLock);
482  mapidx = index_open(TSConfigMapIndexId, AccessShareLock);
483  mapscan = systable_beginscan_ordered(maprel, mapidx,
484  NULL, 1, &mapskey);
485 
486  while ((maptup = systable_getnext_ordered(mapscan, ForwardScanDirection)) != NULL)
487  {
489  int toktype = cfgmap->maptokentype;
490 
491  if (toktype <= 0 || toktype > MAXTOKENTYPE)
492  elog(ERROR, "maptokentype value %d is out of range", toktype);
493  if (toktype < maxtokentype)
494  elog(ERROR, "maptokentype entries are out of order");
495  if (toktype > maxtokentype)
496  {
497  /* starting a new token type, but first save the prior data */
498  if (ndicts > 0)
499  {
500  maplists[maxtokentype].len = ndicts;
501  maplists[maxtokentype].dictIds = (Oid *)
503  sizeof(Oid) * ndicts);
504  memcpy(maplists[maxtokentype].dictIds, mapdicts,
505  sizeof(Oid) * ndicts);
506  }
507  maxtokentype = toktype;
508  mapdicts[0] = cfgmap->mapdict;
509  ndicts = 1;
510  }
511  else
512  {
513  /* continuing data for current token type */
514  if (ndicts >= MAXDICTSPERTT)
515  elog(ERROR, "too many pg_ts_config_map entries for one token type");
516  mapdicts[ndicts++] = cfgmap->mapdict;
517  }
518  }
519 
520  systable_endscan_ordered(mapscan);
521  index_close(mapidx, AccessShareLock);
522  table_close(maprel, AccessShareLock);
523 
524  if (ndicts > 0)
525  {
526  /* save the last token type's dictionaries */
527  maplists[maxtokentype].len = ndicts;
528  maplists[maxtokentype].dictIds = (Oid *)
530  sizeof(Oid) * ndicts);
531  memcpy(maplists[maxtokentype].dictIds, mapdicts,
532  sizeof(Oid) * ndicts);
533  /* and save the overall map */
534  entry->lenmap = maxtokentype + 1;
535  entry->map = (ListDictionary *)
537  sizeof(ListDictionary) * entry->lenmap);
538  memcpy(entry->map, maplists,
539  sizeof(ListDictionary) * entry->lenmap);
540  }
541 
542  entry->isvalid = true;
543  }
544 
545  lastUsedConfig = entry;
546 
547  return entry;
548 }
549 
550 
551 /*---------------------------------------------------
552  * GUC variable "default_text_search_config"
553  *---------------------------------------------------
554  */
555 
556 Oid
557 getTSCurrentConfig(bool emitError)
558 {
559  /* if we have a cached value, return it */
561  return TSCurrentConfigCache;
562 
563  /* fail if GUC hasn't been set up yet */
564  if (TSCurrentConfig == NULL || *TSCurrentConfig == '\0')
565  {
566  if (emitError)
567  elog(ERROR, "text search configuration isn't set");
568  else
569  return InvalidOid;
570  }
571 
572  if (TSConfigCacheHash == NULL)
573  {
574  /* First time through: initialize the tsconfig inval callback */
576  }
577 
578  /* Look up the config */
581  !emitError);
582 
583  return TSCurrentConfigCache;
584 }
585 
586 /* GUC check_hook for default_text_search_config */
587 bool
589 {
590  /*
591  * If we aren't inside a transaction, or connected to a database, we
592  * cannot do the catalog accesses necessary to verify the config name.
593  * Must accept it on faith.
594  */
596  {
597  Oid cfgId;
598  HeapTuple tuple;
599  Form_pg_ts_config cfg;
600  char *buf;
601 
603 
604  /*
605  * When source == PGC_S_TEST, don't throw a hard error for a
606  * nonexistent configuration, only a NOTICE. See comments in guc.h.
607  */
608  if (!OidIsValid(cfgId))
609  {
610  if (source == PGC_S_TEST)
611  {
612  ereport(NOTICE,
613  (errcode(ERRCODE_UNDEFINED_OBJECT),
614  errmsg("text search configuration \"%s\" does not exist", *newval)));
615  return true;
616  }
617  else
618  return false;
619  }
620 
621  /*
622  * Modify the actually stored value to be fully qualified, to ensure
623  * later changes of search_path don't affect it.
624  */
626  if (!HeapTupleIsValid(tuple))
627  elog(ERROR, "cache lookup failed for text search configuration %u",
628  cfgId);
629  cfg = (Form_pg_ts_config) GETSTRUCT(tuple);
630 
632  NameStr(cfg->cfgname));
633 
634  ReleaseSysCache(tuple);
635 
636  /* GUC wants it guc_malloc'd not palloc'd */
637  guc_free(*newval);
638  *newval = guc_strdup(LOG, buf);
639  pfree(buf);
640  if (!*newval)
641  return false;
642  }
643 
644  return true;
645 }
646 
647 /* GUC assign_hook for default_text_search_config */
648 void
649 assign_default_text_search_config(const char *newval, void *extra)
650 {
651  /* Just reset the cache to force a lookup on first use */
653 }
#define NameStr(name)
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unsigned int uint32
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FormData_pg_ts_config_map * Form_pg_ts_config_map
FormData_pg_ts_dict * Form_pg_ts_dict
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uintptr_t Datum
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@ ForwardScanDirection
Definition: sdir.h:26
#define BTEqualStrategyNumber
Definition: stratnum.h:31
Size keysize
Definition: hsearch.h:75
Size entrysize
Definition: hsearch.h:76
Definition: dynahash.c:220
Oid * dictIds
Definition: ts_cache.h:68
Definition: pg_list.h:52
ListDictionary * map
Definition: ts_cache.h:80
MemoryContext dictCtx
Definition: ts_cache.h:61
FmgrInfo prstoken
Definition: ts_cache.h:46
FmgrInfo prsstart
Definition: ts_cache.h:45
FmgrInfo prsheadline
Definition: ts_cache.h:48
FmgrInfo prsend
Definition: ts_cache.h:47
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1221
HeapTuple SearchSysCache1(int cacheId, Datum key1)
Definition: syscache.c:1173
Datum SysCacheGetAttr(int cacheId, HeapTuple tup, AttrNumber attributeNumber, bool *isNull)
Definition: syscache.c:1434
@ TSTEMPLATEOID
Definition: syscache.h:112
@ TSDICTOID
Definition: syscache.h:108
@ TSCONFIGMAP
Definition: syscache.h:104
@ TSPARSEROID
Definition: syscache.h:110
@ TSCONFIGOID
Definition: syscache.h:106
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40
#define MAXTOKENTYPE
Definition: ts_cache.c:59
static TSDictionaryCacheEntry * lastUsedDictionary
Definition: ts_cache.c:67
bool check_default_text_search_config(char **newval, void **extra, GucSource source)
Definition: ts_cache.c:588
Oid getTSCurrentConfig(bool emitError)
Definition: ts_cache.c:557
TSDictionaryCacheEntry * lookup_ts_dictionary_cache(Oid dictId)
Definition: ts_cache.c:209
static void InvalidateTSCacheCallBack(Datum arg, int cacheid, uint32 hashvalue)
Definition: ts_cache.c:93
static void init_ts_config_cache(void)
Definition: ts_cache.c:363
static HTAB * TSDictionaryCacheHash
Definition: ts_cache.c:66
static HTAB * TSConfigCacheHash
Definition: ts_cache.c:69
static TSParserCacheEntry * lastUsedParser
Definition: ts_cache.c:64
char * TSCurrentConfig
Definition: ts_cache.c:75
static Oid TSCurrentConfigCache
Definition: ts_cache.c:77
void assign_default_text_search_config(const char *newval, void *extra)
Definition: ts_cache.c:649
#define MAXDICTSPERTT
Definition: ts_cache.c:60
TSConfigCacheEntry * lookup_ts_config_cache(Oid cfgId)
Definition: ts_cache.c:386
TSParserCacheEntry * lookup_ts_parser_cache(Oid prsId)
Definition: ts_cache.c:112
static TSConfigCacheEntry * lastUsedConfig
Definition: ts_cache.c:70
static HTAB * TSParserCacheHash
Definition: ts_cache.c:63
struct TSDictionaryCacheEntry TSDictionaryCacheEntry
struct TSParserCacheEntry TSParserCacheEntry
List * deserialize_deflist(Datum txt)
Definition: tsearchcmds.c:1584
bool IsTransactionState(void)
Definition: xact.c:377