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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) 2006-2017, 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/heapam.h"
31 #include "access/htup_details.h"
32 #include "access/xact.h"
33 #include "catalog/indexing.h"
34 #include "catalog/namespace.h"
35 #include "catalog/pg_ts_config.h"
37 #include "catalog/pg_ts_dict.h"
38 #include "catalog/pg_ts_parser.h"
39 #include "catalog/pg_ts_template.h"
40 #include "commands/defrem.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/inval.h"
46 #include "utils/lsyscache.h"
47 #include "utils/memutils.h"
48 #include "utils/regproc.h"
49 #include "utils/syscache.h"
50 #include "utils/tqual.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 {
95  HTAB *hash = (HTAB *) DatumGetPointer(arg);
97  TSAnyCacheEntry *entry;
98 
99  hash_seq_init(&status, hash);
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  MemSet(&ctl, 0, sizeof(ctl));
122  ctl.keysize = sizeof(Oid);
123  ctl.entrysize = sizeof(TSParserCacheEntry);
124  TSParserCacheHash = hash_create("Tsearch parser cache", 4,
125  &ctl, HASH_ELEM | HASH_BLOBS);
126  /* Flush cache on pg_ts_parser changes */
128  PointerGetDatum(TSParserCacheHash));
129 
130  /* Also make sure CacheMemoryContext exists */
131  if (!CacheMemoryContext)
133  }
134 
135  /* Check single-entry cache */
136  if (lastUsedParser && lastUsedParser->prsId == prsId &&
137  lastUsedParser->isvalid)
138  return lastUsedParser;
139 
140  /* Try to look up an existing entry */
141  entry = (TSParserCacheEntry *) hash_search(TSParserCacheHash,
142  (void *) &prsId,
143  HASH_FIND, NULL);
144  if (entry == NULL || !entry->isvalid)
145  {
146  /*
147  * If we didn't find one, we want to make one. But first look up the
148  * object to be sure the OID is real.
149  */
150  HeapTuple tp;
151  Form_pg_ts_parser prs;
152 
154  if (!HeapTupleIsValid(tp))
155  elog(ERROR, "cache lookup failed for text search parser %u",
156  prsId);
157  prs = (Form_pg_ts_parser) GETSTRUCT(tp);
158 
159  /*
160  * Sanity checks
161  */
162  if (!OidIsValid(prs->prsstart))
163  elog(ERROR, "text search parser %u has no prsstart method", prsId);
164  if (!OidIsValid(prs->prstoken))
165  elog(ERROR, "text search parser %u has no prstoken method", prsId);
166  if (!OidIsValid(prs->prsend))
167  elog(ERROR, "text search parser %u has no prsend method", prsId);
168 
169  if (entry == NULL)
170  {
171  bool found;
172 
173  /* Now make the cache entry */
174  entry = (TSParserCacheEntry *)
175  hash_search(TSParserCacheHash,
176  (void *) &prsId,
177  HASH_ENTER, &found);
178  Assert(!found); /* it wasn't there a moment ago */
179  }
180 
181  MemSet(entry, 0, sizeof(TSParserCacheEntry));
182  entry->prsId = prsId;
183  entry->startOid = prs->prsstart;
184  entry->tokenOid = prs->prstoken;
185  entry->endOid = prs->prsend;
186  entry->headlineOid = prs->prsheadline;
187  entry->lextypeOid = prs->prslextype;
188 
189  ReleaseSysCache(tp);
190 
193  fmgr_info_cxt(entry->endOid, &entry->prsend, CacheMemoryContext);
194  if (OidIsValid(entry->headlineOid))
195  fmgr_info_cxt(entry->headlineOid, &entry->prsheadline,
197 
198  entry->isvalid = true;
199  }
200 
201  lastUsedParser = entry;
202 
203  return entry;
204 }
205 
206 /*
207  * Fetch dictionary cache entry
208  */
211 {
212  TSDictionaryCacheEntry *entry;
213 
214  if (TSDictionaryCacheHash == NULL)
215  {
216  /* First time through: initialize the hash table */
217  HASHCTL ctl;
218 
219  MemSet(&ctl, 0, sizeof(ctl));
220  ctl.keysize = sizeof(Oid);
221  ctl.entrysize = sizeof(TSDictionaryCacheEntry);
222  TSDictionaryCacheHash = hash_create("Tsearch dictionary cache", 8,
223  &ctl, HASH_ELEM | HASH_BLOBS);
224  /* Flush cache on pg_ts_dict and pg_ts_template changes */
226  PointerGetDatum(TSDictionaryCacheHash));
228  PointerGetDatum(TSDictionaryCacheHash));
229 
230  /* Also make sure CacheMemoryContext exists */
231  if (!CacheMemoryContext)
233  }
234 
235  /* Check single-entry cache */
236  if (lastUsedDictionary && lastUsedDictionary->dictId == dictId &&
237  lastUsedDictionary->isvalid)
238  return lastUsedDictionary;
239 
240  /* Try to look up an existing entry */
241  entry = (TSDictionaryCacheEntry *) hash_search(TSDictionaryCacheHash,
242  (void *) &dictId,
243  HASH_FIND, NULL);
244  if (entry == NULL || !entry->isvalid)
245  {
246  /*
247  * If we didn't find one, we want to make one. But first look up the
248  * object to be sure the OID is real.
249  */
250  HeapTuple tpdict,
251  tptmpl;
252  Form_pg_ts_dict dict;
253  Form_pg_ts_template template;
254  MemoryContext saveCtx;
255 
256  tpdict = SearchSysCache1(TSDICTOID, ObjectIdGetDatum(dictId));
257  if (!HeapTupleIsValid(tpdict))
258  elog(ERROR, "cache lookup failed for text search dictionary %u",
259  dictId);
260  dict = (Form_pg_ts_dict) GETSTRUCT(tpdict);
261 
262  /*
263  * Sanity checks
264  */
265  if (!OidIsValid(dict->dicttemplate))
266  elog(ERROR, "text search dictionary %u has no template", dictId);
267 
268  /*
269  * Retrieve dictionary's template
270  */
272  ObjectIdGetDatum(dict->dicttemplate));
273  if (!HeapTupleIsValid(tptmpl))
274  elog(ERROR, "cache lookup failed for text search template %u",
275  dict->dicttemplate);
276  template = (Form_pg_ts_template) GETSTRUCT(tptmpl);
277 
278  /*
279  * Sanity checks
280  */
281  if (!OidIsValid(template->tmpllexize))
282  elog(ERROR, "text search template %u has no lexize method",
283  template->tmpllexize);
284 
285  if (entry == NULL)
286  {
287  bool found;
288 
289  /* Now make the cache entry */
290  entry = (TSDictionaryCacheEntry *)
291  hash_search(TSDictionaryCacheHash,
292  (void *) &dictId,
293  HASH_ENTER, &found);
294  Assert(!found); /* it wasn't there a moment ago */
295 
296  /* Create private memory context the first time through */
298  NameStr(dict->dictname),
300  }
301  else
302  {
303  /* Clear the existing entry's private context */
304  saveCtx = entry->dictCtx;
306  }
307 
308  MemSet(entry, 0, sizeof(TSDictionaryCacheEntry));
309  entry->dictId = dictId;
310  entry->dictCtx = saveCtx;
311 
312  entry->lexizeOid = template->tmpllexize;
313 
314  if (OidIsValid(template->tmplinit))
315  {
316  List *dictoptions;
317  Datum opt;
318  bool isnull;
319  MemoryContext oldcontext;
320 
321  /*
322  * Init method runs in dictionary's private memory context, and we
323  * make sure the options are stored there too
324  */
325  oldcontext = MemoryContextSwitchTo(entry->dictCtx);
326 
327  opt = SysCacheGetAttr(TSDICTOID, tpdict,
329  &isnull);
330  if (isnull)
331  dictoptions = NIL;
332  else
333  dictoptions = deserialize_deflist(opt);
334 
335  entry->dictData =
336  DatumGetPointer(OidFunctionCall1(template->tmplinit,
337  PointerGetDatum(dictoptions)));
338 
339  MemoryContextSwitchTo(oldcontext);
340  }
341 
342  ReleaseSysCache(tptmpl);
343  ReleaseSysCache(tpdict);
344 
345  fmgr_info_cxt(entry->lexizeOid, &entry->lexize, entry->dictCtx);
346 
347  entry->isvalid = true;
348  }
349 
350  lastUsedDictionary = entry;
351 
352  return entry;
353 }
354 
355 /*
356  * Initialize config cache and prepare callbacks. This is split out of
357  * lookup_ts_config_cache because we need to activate the callback before
358  * caching TSCurrentConfigCache, too.
359  */
360 static void
362 {
363  HASHCTL ctl;
364 
365  MemSet(&ctl, 0, sizeof(ctl));
366  ctl.keysize = sizeof(Oid);
367  ctl.entrysize = sizeof(TSConfigCacheEntry);
368  TSConfigCacheHash = hash_create("Tsearch configuration cache", 16,
369  &ctl, HASH_ELEM | HASH_BLOBS);
370  /* Flush cache on pg_ts_config and pg_ts_config_map changes */
372  PointerGetDatum(TSConfigCacheHash));
374  PointerGetDatum(TSConfigCacheHash));
375 
376  /* Also make sure CacheMemoryContext exists */
377  if (!CacheMemoryContext)
379 }
380 
381 /*
382  * Fetch configuration cache entry
383  */
386 {
387  TSConfigCacheEntry *entry;
388 
389  if (TSConfigCacheHash == NULL)
390  {
391  /* First time through: initialize the hash table */
393  }
394 
395  /* Check single-entry cache */
396  if (lastUsedConfig && lastUsedConfig->cfgId == cfgId &&
397  lastUsedConfig->isvalid)
398  return lastUsedConfig;
399 
400  /* Try to look up an existing entry */
401  entry = (TSConfigCacheEntry *) hash_search(TSConfigCacheHash,
402  (void *) &cfgId,
403  HASH_FIND, NULL);
404  if (entry == NULL || !entry->isvalid)
405  {
406  /*
407  * If we didn't find one, we want to make one. But first look up the
408  * object to be sure the OID is real.
409  */
410  HeapTuple tp;
411  Form_pg_ts_config cfg;
412  Relation maprel;
413  Relation mapidx;
414  ScanKeyData mapskey;
415  SysScanDesc mapscan;
416  HeapTuple maptup;
417  ListDictionary maplists[MAXTOKENTYPE + 1];
418  Oid mapdicts[MAXDICTSPERTT];
419  int maxtokentype;
420  int ndicts;
421  int i;
422 
424  if (!HeapTupleIsValid(tp))
425  elog(ERROR, "cache lookup failed for text search configuration %u",
426  cfgId);
427  cfg = (Form_pg_ts_config) GETSTRUCT(tp);
428 
429  /*
430  * Sanity checks
431  */
432  if (!OidIsValid(cfg->cfgparser))
433  elog(ERROR, "text search configuration %u has no parser", cfgId);
434 
435  if (entry == NULL)
436  {
437  bool found;
438 
439  /* Now make the cache entry */
440  entry = (TSConfigCacheEntry *)
441  hash_search(TSConfigCacheHash,
442  (void *) &cfgId,
443  HASH_ENTER, &found);
444  Assert(!found); /* it wasn't there a moment ago */
445  }
446  else
447  {
448  /* Cleanup old contents */
449  if (entry->map)
450  {
451  for (i = 0; i < entry->lenmap; i++)
452  if (entry->map[i].dictIds)
453  pfree(entry->map[i].dictIds);
454  pfree(entry->map);
455  }
456  }
457 
458  MemSet(entry, 0, sizeof(TSConfigCacheEntry));
459  entry->cfgId = cfgId;
460  entry->prsId = cfg->cfgparser;
461 
462  ReleaseSysCache(tp);
463 
464  /*
465  * Scan pg_ts_config_map to gather dictionary list for each token type
466  *
467  * Because the index is on (mapcfg, maptokentype, mapseqno), we will
468  * see the entries in maptokentype order, and in mapseqno order for
469  * each token type, even though we didn't explicitly ask for that.
470  */
471  MemSet(maplists, 0, sizeof(maplists));
472  maxtokentype = 0;
473  ndicts = 0;
474 
475  ScanKeyInit(&mapskey,
477  BTEqualStrategyNumber, F_OIDEQ,
478  ObjectIdGetDatum(cfgId));
479 
482  mapscan = systable_beginscan_ordered(maprel, mapidx,
483  NULL, 1, &mapskey);
484 
485  while ((maptup = systable_getnext_ordered(mapscan, ForwardScanDirection)) != NULL)
486  {
488  int toktype = cfgmap->maptokentype;
489 
490  if (toktype <= 0 || toktype > MAXTOKENTYPE)
491  elog(ERROR, "maptokentype value %d is out of range", toktype);
492  if (toktype < maxtokentype)
493  elog(ERROR, "maptokentype entries are out of order");
494  if (toktype > maxtokentype)
495  {
496  /* starting a new token type, but first save the prior data */
497  if (ndicts > 0)
498  {
499  maplists[maxtokentype].len = ndicts;
500  maplists[maxtokentype].dictIds = (Oid *)
502  sizeof(Oid) * ndicts);
503  memcpy(maplists[maxtokentype].dictIds, mapdicts,
504  sizeof(Oid) * ndicts);
505  }
506  maxtokentype = toktype;
507  mapdicts[0] = cfgmap->mapdict;
508  ndicts = 1;
509  }
510  else
511  {
512  /* continuing data for current token type */
513  if (ndicts >= MAXDICTSPERTT)
514  elog(ERROR, "too many pg_ts_config_map entries for one token type");
515  mapdicts[ndicts++] = cfgmap->mapdict;
516  }
517  }
518 
519  systable_endscan_ordered(mapscan);
520  index_close(mapidx, AccessShareLock);
521  heap_close(maprel, AccessShareLock);
522 
523  if (ndicts > 0)
524  {
525  /* save the last token type's dictionaries */
526  maplists[maxtokentype].len = ndicts;
527  maplists[maxtokentype].dictIds = (Oid *)
529  sizeof(Oid) * ndicts);
530  memcpy(maplists[maxtokentype].dictIds, mapdicts,
531  sizeof(Oid) * ndicts);
532  /* and save the overall map */
533  entry->lenmap = maxtokentype + 1;
534  entry->map = (ListDictionary *)
536  sizeof(ListDictionary) * entry->lenmap);
537  memcpy(entry->map, maplists,
538  sizeof(ListDictionary) * entry->lenmap);
539  }
540 
541  entry->isvalid = true;
542  }
543 
544  lastUsedConfig = entry;
545 
546  return entry;
547 }
548 
549 
550 /*---------------------------------------------------
551  * GUC variable "default_text_search_config"
552  *---------------------------------------------------
553  */
554 
555 Oid
556 getTSCurrentConfig(bool emitError)
557 {
558  /* if we have a cached value, return it */
560  return TSCurrentConfigCache;
561 
562  /* fail if GUC hasn't been set up yet */
563  if (TSCurrentConfig == NULL || *TSCurrentConfig == '\0')
564  {
565  if (emitError)
566  elog(ERROR, "text search configuration isn't set");
567  else
568  return InvalidOid;
569  }
570 
571  if (TSConfigCacheHash == NULL)
572  {
573  /* First time through: initialize the tsconfig inval callback */
575  }
576 
577  /* Look up the config */
580  !emitError);
581 
582  return TSCurrentConfigCache;
583 }
584 
585 /* GUC check_hook for default_text_search_config */
586 bool
587 check_TSCurrentConfig(char **newval, void **extra, GucSource source)
588 {
589  /*
590  * If we aren't inside a transaction, we cannot do database access so
591  * cannot verify the config name. Must accept it on faith.
592  */
593  if (IsTransactionState())
594  {
595  Oid cfgId;
597  Form_pg_ts_config cfg;
598  char *buf;
599 
600  cfgId = get_ts_config_oid(stringToQualifiedNameList(*newval), true);
601 
602  /*
603  * When source == PGC_S_TEST, don't throw a hard error for a
604  * nonexistent configuration, only a NOTICE. See comments in guc.h.
605  */
606  if (!OidIsValid(cfgId))
607  {
608  if (source == PGC_S_TEST)
609  {
610  ereport(NOTICE,
611  (errcode(ERRCODE_UNDEFINED_OBJECT),
612  errmsg("text search configuration \"%s\" does not exist", *newval)));
613  return true;
614  }
615  else
616  return false;
617  }
618 
619  /*
620  * Modify the actually stored value to be fully qualified, to ensure
621  * later changes of search_path don't affect it.
622  */
624  if (!HeapTupleIsValid(tuple))
625  elog(ERROR, "cache lookup failed for text search configuration %u",
626  cfgId);
627  cfg = (Form_pg_ts_config) GETSTRUCT(tuple);
628 
629  buf = quote_qualified_identifier(get_namespace_name(cfg->cfgnamespace),
630  NameStr(cfg->cfgname));
631 
632  ReleaseSysCache(tuple);
633 
634  /* GUC wants it malloc'd not palloc'd */
635  free(*newval);
636  *newval = strdup(buf);
637  pfree(buf);
638  if (!*newval)
639  return false;
640  }
641 
642  return true;
643 }
644 
645 /* GUC assign_hook for default_text_search_config */
646 void
647 assign_TSCurrentConfig(const char *newval, void *extra)
648 {
649  /* Just reset the cache to force a lookup on first use */
651 }
#define NIL
Definition: pg_list.h:69
#define GETSTRUCT(TUP)
Definition: htup_details.h:656
#define MAXDICTSPERTT
Definition: ts_cache.c:60
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Definition: hsearch.h:87
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Definition: pg_ts_config.h:41
Oid getTSCurrentConfig(bool emitError)
Definition: ts_cache.c:556
FormData_pg_ts_config_map * Form_pg_ts_config_map
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Size entrysize
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Definition: syscache.h:159
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Definition: ts_cache.c:210
GucSource
Definition: guc.h:105
static Oid TSCurrentConfigCache
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TSConfigCacheEntry * lookup_ts_config_cache(Oid cfgId)
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Definition: pg_ts_dict.h:45
static HTAB * TSParserCacheHash
Definition: ts_cache.c:63
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Definition: lsyscache.c:3033
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Definition: ts_cache.c:647
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Definition: pg_ts_parser.h:44
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Definition: syscache.c:1325
Relation heap_open(Oid relationId, LOCKMODE lockmode)
Definition: heapam.c:1290
void systable_endscan_ordered(SysScanDesc sysscan)
Definition: genam.c:614
Size keysize
Definition: hsearch.h:72
#define InvalidOid
Definition: postgres_ext.h:36
static void init_ts_config_cache(void)
Definition: ts_cache.c:361
static TSParserCacheEntry * lastUsedParser
Definition: ts_cache.c:64
#define NOTICE
Definition: elog.h:37
#define free(a)
Definition: header.h:65
static HTAB * TSConfigCacheHash
Definition: ts_cache.c:69
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
#define Assert(condition)
Definition: c.h:664
FmgrInfo prstoken
Definition: ts_cache.h:46
#define Anum_pg_ts_dict_dictinitoption
Definition: pg_ts_dict.h:56
void CreateCacheMemoryContext(void)
Definition: catcache.c:511
HeapTupleData tuple
Definition: catcache.h:153
#define newval
bool IsTransactionState(void)
Definition: xact.c:351
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1385
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1375
static TSConfigCacheEntry * lastUsedConfig
Definition: ts_cache.c:70
void index_close(Relation relation, LOCKMODE lockmode)
Definition: indexam.c:176
#define DatumGetPointer(X)
Definition: postgres.h:555
FmgrInfo prsstart
Definition: ts_cache.h:45
List * stringToQualifiedNameList(const char *string)
Definition: regproc.c:1687
int errmsg(const char *fmt,...)
Definition: elog.c:797
SysScanDesc systable_beginscan_ordered(Relation heapRelation, Relation indexRelation, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:533
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:706
FormData_pg_ts_template * Form_pg_ts_template
struct TSParserCacheEntry TSParserCacheEntry
int i
#define NameStr(name)
Definition: c.h:493
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
static HTAB * TSDictionaryCacheHash
Definition: ts_cache.c:66
#define TSConfigMapIndexId
Definition: indexing.h:264
void * arg
#define elog
Definition: elog.h:219
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:224
struct TSDictionaryCacheEntry TSDictionaryCacheEntry
Definition: pg_list.h:45
static unsigned hash(unsigned *uv, int n)
Definition: rege_dfa.c:541
bool check_TSCurrentConfig(char **newval, void **extra, GucSource source)
Definition: ts_cache.c:587
MemoryContext dictCtx
Definition: ts_cache.h:61
Relation index_open(Oid relationId, LOCKMODE lockmode)
Definition: indexam.c:151
#define BTEqualStrategyNumber
Definition: stratnum.h:31
MemoryContext CacheMemoryContext
Definition: mcxt.c:46
FmgrInfo prsheadline
Definition: ts_cache.h:48