1 |
/* |
2 |
* integrate Hyper Estraier into PostgreSQL |
3 |
* |
4 |
* Dobrica Pavlinusic <dpavlin@rot13.org> 2005-05-19 |
5 |
* |
6 |
* TODO: |
7 |
* - all |
8 |
* |
9 |
* NOTES: |
10 |
* - clear structures with memset to support hash indexes (who whould like |
11 |
* to create hash index on table returned from function?) |
12 |
* - number of returned rows is set by PostgreSQL evaluator, see: |
13 |
* http://archives.postgresql.org/pgsql-hackers/2005-02/msg00546.php |
14 |
* |
15 |
* Based on: |
16 |
* - C example from PostgreSQL documentation (BSD licence) |
17 |
* - coreexample002.c and nodeexample002.c from Hyper Estraier (GPL) |
18 |
* - _textin/_textout from pgcurl.c (LGPL) |
19 |
* |
20 |
* This code is licenced under GPL |
21 |
*/ |
22 |
|
23 |
#include "postgres.h" |
24 |
#include "fmgr.h" |
25 |
#include "funcapi.h" |
26 |
#include "utils/builtins.h" |
27 |
#include "utils/array.h" |
28 |
#include "utils/lsyscache.h" |
29 |
#include "miscadmin.h" |
30 |
#include <estraier.h> |
31 |
#include <cabin.h> |
32 |
#include <estnode.h> |
33 |
|
34 |
#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str)) |
35 |
#define _textout(str) DatumGetPointer(DirectFunctionCall1(textout, PointerGetDatum(str))) |
36 |
#define GET_STR(textp) DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp))) |
37 |
#define GET_TEXT(cstrp) DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(cstrp))) |
38 |
|
39 |
/* SortMem got renamed in PostgreSQL 8.0 */ |
40 |
#ifndef SortMem |
41 |
#define SortMem 16 * 1024 |
42 |
#endif |
43 |
|
44 |
#define ATTR_DELIMITER "{{!}}" |
45 |
#define HINTS_PREFIX "HINTS." |
46 |
|
47 |
/* prototype */ |
48 |
char *attr2text(ESTDOC *doc, char *attr); |
49 |
char *node_attr2text(ESTRESDOC *rdoc, char *attr); |
50 |
void cond_add_attr(ESTCOND *cond, char *attr); |
51 |
|
52 |
|
53 |
/* work in progress */ |
54 |
PG_FUNCTION_INFO_V1(pgest_attr); |
55 |
Datum pgest_attr(PG_FUNCTION_ARGS) |
56 |
{ |
57 |
ArrayType *attr_arr = PG_GETARG_ARRAYTYPE_P(6); |
58 |
Oid attr_element_type = ARR_ELEMTYPE(attr_arr); |
59 |
int attr_ndims = ARR_NDIM(attr_arr); |
60 |
int *attr_dim_counts = ARR_DIMS(attr_arr); |
61 |
int *attr_dim_lower_bounds = ARR_LBOUND(attr_arr); |
62 |
int ncols = 0; |
63 |
int nrows = 0; |
64 |
int indx[MAXDIM]; |
65 |
int16 attr_len; |
66 |
bool attr_byval; |
67 |
char attr_align; |
68 |
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; |
69 |
AttInMetadata *attinmeta; |
70 |
TupleDesc tupdesc; |
71 |
Tuplestorestate *tupstore = NULL; |
72 |
HeapTuple tuple; |
73 |
MemoryContext per_query_ctx; |
74 |
MemoryContext oldcontext; |
75 |
Datum dvalue; |
76 |
char **values; |
77 |
int rsinfo_ncols; |
78 |
int i, j; |
79 |
/* estvars */ |
80 |
ESTDB *db; |
81 |
ESTCOND *cond; |
82 |
ESTDOC *doc; |
83 |
int ecode, *est_result, resnum; |
84 |
int limit = 0; |
85 |
int offset = 0; |
86 |
|
87 |
char *index_path; |
88 |
char *query; |
89 |
char *attr; |
90 |
char *order; |
91 |
|
92 |
|
93 |
/* only allow 1D input array */ |
94 |
if (attr_ndims == 1) |
95 |
{ |
96 |
ncols = attr_dim_counts[0]; |
97 |
} |
98 |
else |
99 |
ereport(ERROR, |
100 |
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
101 |
errmsg("invalid input array"), |
102 |
errdetail("Input array must have 1 dimension"))); |
103 |
|
104 |
/* check to see if caller supports us returning a tuplestore */ |
105 |
if (!rsinfo || !(rsinfo->allowedModes & SFRM_Materialize)) |
106 |
ereport(ERROR, |
107 |
(errcode(ERRCODE_SYNTAX_ERROR), |
108 |
errmsg("materialize mode required, but it is not " \ |
109 |
"allowed in this context"))); |
110 |
|
111 |
/* get info about element type needed to construct the array */ |
112 |
get_typlenbyvalalign(attr_element_type, &attr_len, &attr_byval, &attr_align); |
113 |
|
114 |
/* get the requested return tuple description */ |
115 |
tupdesc = rsinfo->expectedDesc; |
116 |
rsinfo_ncols = tupdesc->natts; |
117 |
|
118 |
/* |
119 |
* The requested tuple description better match up with the array |
120 |
* we were given. |
121 |
*/ |
122 |
if (rsinfo_ncols != ncols) |
123 |
ereport(ERROR, |
124 |
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
125 |
errmsg("invalid input array"), |
126 |
errdetail("Number of elements in array must match number of query specified columns."))); |
127 |
|
128 |
/* OK, use it */ |
129 |
attinmeta = TupleDescGetAttInMetadata(tupdesc); |
130 |
|
131 |
/* Now go to work */ |
132 |
rsinfo->returnMode = SFRM_Materialize; |
133 |
|
134 |
per_query_ctx = fcinfo->flinfo->fn_mcxt; |
135 |
oldcontext = MemoryContextSwitchTo(per_query_ctx); |
136 |
|
137 |
/* initialize our tuplestore */ |
138 |
tupstore = tuplestore_begin_heap(true, false, SortMem); |
139 |
|
140 |
|
141 |
/* take rest of arguments from function */ |
142 |
|
143 |
/* index path */ |
144 |
if (PG_ARGISNULL(0)) { |
145 |
ereport(ERROR, |
146 |
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
147 |
errmsg("index path can't be null"), |
148 |
errdetail("Index path must be valid full path to HyperEstraier index"))); |
149 |
} |
150 |
index_path = _textout(PG_GETARG_TEXT_P(0)); |
151 |
|
152 |
/* query string */ |
153 |
if (PG_ARGISNULL(1)) { |
154 |
query = ""; |
155 |
} else { |
156 |
query = _textout(PG_GETARG_TEXT_P(1)); |
157 |
} |
158 |
|
159 |
/* atribute filter */ |
160 |
if (PG_ARGISNULL(2)) { |
161 |
attr = ""; |
162 |
} else { |
163 |
attr = _textout(PG_GETARG_TEXT_P(2)); |
164 |
} |
165 |
|
166 |
/* sort order */ |
167 |
if (PG_ARGISNULL(3)) { |
168 |
order = ""; |
169 |
} else { |
170 |
order = _textout(PG_GETARG_TEXT_P(3)); |
171 |
} |
172 |
|
173 |
|
174 |
/* limit */ |
175 |
if (PG_ARGISNULL(4)) { |
176 |
limit = 0; |
177 |
} else { |
178 |
limit = PG_GETARG_INT32(4); |
179 |
} |
180 |
|
181 |
/* offset */ |
182 |
if (PG_ARGISNULL(5)) { |
183 |
offset = 0; |
184 |
} else { |
185 |
offset = PG_GETARG_INT32(5); |
186 |
} |
187 |
|
188 |
|
189 |
/* open the database */ |
190 |
elog(DEBUG1, "pgest_attr: est_db_open(%s)", index_path); |
191 |
|
192 |
if(!(db = est_db_open(index_path, ESTDBREADER, &ecode))){ |
193 |
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
194 |
errmsg("est_db_open: can't open %s: %d", index_path, ecode), |
195 |
errdetail(est_err_msg(ecode)))); |
196 |
} |
197 |
|
198 |
elog(DEBUG1, "pgest_attr: query[%s] attr[%s] limit %d offset %d", query, (PG_ARGISNULL(2) ? "NULL" : attr), limit, offset); |
199 |
|
200 |
/* create a search condition object */ |
201 |
if (!(cond = est_cond_new())) { |
202 |
ereport(ERROR, (errcode(ERRCODE_QUERY_CANCELED), |
203 |
errmsg("pgest_attr: est_cond_new failed"))); |
204 |
} |
205 |
|
206 |
/* set the search phrase to the search condition object */ |
207 |
if (! PG_ARGISNULL(1) && strlen(query) > 0) |
208 |
est_cond_set_phrase(cond, query); |
209 |
|
210 |
/* minimum valid attribute length is 10: @a STREQ a */ |
211 |
if (! PG_ARGISNULL(2) && strlen(attr) >= 10) { |
212 |
elog(DEBUG1,"attributes: %s", attr); |
213 |
cond_add_attr(cond, attr); |
214 |
} |
215 |
|
216 |
/* set the search phrase to the search condition object */ |
217 |
if (! PG_ARGISNULL(3) && strlen(order) > 0) { |
218 |
elog(DEBUG1,"est_cond_set_order(%s)", order); |
219 |
est_cond_set_order(cond, order); |
220 |
} |
221 |
|
222 |
if (limit) { |
223 |
elog(DEBUG1,"est_cond_set_max(%d)", limit + offset); |
224 |
est_cond_set_max(cond, limit + offset); |
225 |
} |
226 |
|
227 |
/* get the result of search */ |
228 |
est_result = est_db_search(db, cond, &resnum, NULL); |
229 |
|
230 |
/* check if results exists */ |
231 |
if ( 0 == resnum ) { |
232 |
elog(INFO, "pgest_attr: no results for: %s", query ); |
233 |
} |
234 |
|
235 |
/* total number of tuples to be returned */ |
236 |
if (limit && limit < resnum) { |
237 |
nrows = limit; |
238 |
} else { |
239 |
nrows = resnum - offset; |
240 |
} |
241 |
|
242 |
|
243 |
elog(DEBUG1, "pgest_attr: found %d hits for %s", resnum, query); |
244 |
|
245 |
values = (char **) palloc(ncols * sizeof(char *)); |
246 |
|
247 |
for (i = 0; i < nrows; i++) |
248 |
{ |
249 |
|
250 |
/* get result from estraier */ |
251 |
if (! ( doc = est_db_get_doc(db, est_result[i + offset], 0)) ) { |
252 |
elog(INFO, "pgest_attr: can't find result %d", i + offset); |
253 |
} else { |
254 |
elog(DEBUG1, "URI: %s\n Title: %s\n", |
255 |
est_doc_attr(doc, "@uri"), |
256 |
est_doc_attr(doc, "@title") |
257 |
); |
258 |
} |
259 |
|
260 |
/* iterate over results */ |
261 |
for (j = 0; j < ncols; j++) |
262 |
{ |
263 |
bool isnull; |
264 |
|
265 |
/* array value of this position */ |
266 |
indx[0] = j + attr_dim_lower_bounds[0]; |
267 |
|
268 |
dvalue = array_ref(attr_arr, attr_ndims, indx, -1, attr_len, attr_byval, attr_align, &isnull); |
269 |
|
270 |
if (!isnull && doc) |
271 |
values[j] = DatumGetCString( |
272 |
attr2text(doc, |
273 |
(char *)DirectFunctionCall1(textout, dvalue) |
274 |
)); |
275 |
else |
276 |
values[j] = NULL; |
277 |
} |
278 |
/* construct the tuple */ |
279 |
tuple = BuildTupleFromCStrings(attinmeta, values); |
280 |
|
281 |
/* now store it */ |
282 |
tuplestore_puttuple(tupstore, tuple); |
283 |
|
284 |
/* delete estraier document object */ |
285 |
if (doc) est_doc_delete(doc); |
286 |
} |
287 |
|
288 |
tuplestore_donestoring(tupstore); |
289 |
rsinfo->setResult = tupstore; |
290 |
|
291 |
/* |
292 |
* SFRM_Materialize mode expects us to return a NULL Datum. The actual |
293 |
* tuples are in our tuplestore and passed back through |
294 |
* rsinfo->setResult. rsinfo->setDesc is set to the tuple description |
295 |
* that we actually used to build our tuples with, so the caller can |
296 |
* verify we did what it was expecting. |
297 |
*/ |
298 |
rsinfo->setDesc = tupdesc; |
299 |
MemoryContextSwitchTo(oldcontext); |
300 |
|
301 |
est_cond_delete(cond); |
302 |
|
303 |
if(!est_db_close(db, &ecode)){ |
304 |
ereport(ERROR, (errcode(ERRCODE_IO_ERROR), |
305 |
errmsg("est_db_close: %d", ecode), |
306 |
errdetail(est_err_msg(ecode)))); |
307 |
} |
308 |
|
309 |
return (Datum) 0; |
310 |
} |
311 |
|
312 |
|
313 |
/* make text var from attr */ |
314 |
char *attr2text(ESTDOC *doc, char *attr) { |
315 |
char *val; |
316 |
const char *attrval; |
317 |
int len; |
318 |
int attrlen; |
319 |
|
320 |
if (! doc) return (Datum) NULL; |
321 |
|
322 |
elog(DEBUG1, "doc: %p, attr: %s", doc, attr); |
323 |
|
324 |
if ( (attrval = est_doc_attr(doc, attr)) && (attrlen = strlen(attrval)) ) { |
325 |
val = (char *) palloc(attrlen * sizeof(char)); |
326 |
} else { |
327 |
return (Datum) NULL; |
328 |
} |
329 |
|
330 |
len = strlen(attrval); |
331 |
elog(DEBUG1, "attr2text(%s) = '%s' %d bytes", attr, attrval, len); |
332 |
|
333 |
len++; |
334 |
len *= sizeof(char); |
335 |
|
336 |
elog(DEBUG2, "palloc(%d)", len); |
337 |
|
338 |
val = palloc(len); |
339 |
|
340 |
memset(val, 0, len); |
341 |
strncpy(val, attrval, len); |
342 |
|
343 |
elog(DEBUG2, "val=%s", val); |
344 |
|
345 |
return val; |
346 |
} |
347 |
|
348 |
/* |
349 |
* variation on theme: use node API which doesn't open index on |
350 |
* every query which is much faster for large indexes |
351 |
* |
352 |
*/ |
353 |
|
354 |
/* select * from pgest( */ |
355 |
#define _arg_node_uri 0 |
356 |
#define _arg_login 1 |
357 |
#define _arg_passwd 2 |
358 |
#define _arg_depth 3 |
359 |
#define _arg_query 4 |
360 |
#define _arg_attr 5 |
361 |
#define _arg_order 6 |
362 |
#define _arg_limit 7 |
363 |
#define _arg_offset 8 |
364 |
#define _arg_attr_array 9 |
365 |
/* as (foo text, ... ); */ |
366 |
|
367 |
|
368 |
PG_FUNCTION_INFO_V1(pgest_node); |
369 |
Datum pgest_node(PG_FUNCTION_ARGS) |
370 |
{ |
371 |
ArrayType *attr_arr = PG_GETARG_ARRAYTYPE_P(_arg_attr_array); |
372 |
Oid attr_element_type = ARR_ELEMTYPE(attr_arr); |
373 |
int attr_ndims = ARR_NDIM(attr_arr); |
374 |
int *attr_dim_counts = ARR_DIMS(attr_arr); |
375 |
int *attr_dim_lower_bounds = ARR_LBOUND(attr_arr); |
376 |
int ncols = 0; |
377 |
int nrows = 0; |
378 |
int indx[MAXDIM]; |
379 |
int16 attr_len; |
380 |
bool attr_byval; |
381 |
char attr_align; |
382 |
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; |
383 |
AttInMetadata *attinmeta; |
384 |
TupleDesc tupdesc; |
385 |
Tuplestorestate *tupstore = NULL; |
386 |
HeapTuple tuple; |
387 |
MemoryContext per_query_ctx; |
388 |
MemoryContext oldcontext; |
389 |
Datum dvalue; |
390 |
char **values; |
391 |
int rsinfo_ncols; |
392 |
int i, j; |
393 |
/* estvars */ |
394 |
ESTNODE *node; |
395 |
ESTCOND *cond; |
396 |
ESTNODERES *nres; |
397 |
ESTRESDOC *rdoc; |
398 |
CBMAP *hints; |
399 |
int resnum = 0; |
400 |
int limit = 0; |
401 |
int offset = 0; |
402 |
int depth = 0; |
403 |
|
404 |
char *node_url; |
405 |
char *user, *passwd; |
406 |
char *query; |
407 |
char *attr; |
408 |
char *order; |
409 |
|
410 |
|
411 |
/* only allow 1D input array */ |
412 |
if (attr_ndims == 1) |
413 |
{ |
414 |
ncols = attr_dim_counts[0]; |
415 |
} |
416 |
else |
417 |
ereport(ERROR, |
418 |
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
419 |
errmsg("invalid input array"), |
420 |
errdetail("Input array must have 1 dimension"))); |
421 |
|
422 |
/* check to see if caller supports us returning a tuplestore */ |
423 |
if (!rsinfo || !(rsinfo->allowedModes & SFRM_Materialize)) |
424 |
ereport(ERROR, |
425 |
(errcode(ERRCODE_SYNTAX_ERROR), |
426 |
errmsg("materialize mode required, but it is not " \ |
427 |
"allowed in this context"))); |
428 |
|
429 |
/* get info about element type needed to construct the array */ |
430 |
get_typlenbyvalalign(attr_element_type, &attr_len, &attr_byval, &attr_align); |
431 |
|
432 |
/* get the requested return tuple description */ |
433 |
tupdesc = rsinfo->expectedDesc; |
434 |
rsinfo_ncols = tupdesc->natts; |
435 |
|
436 |
/* |
437 |
* The requested tuple description better match up with the array |
438 |
* we were given. |
439 |
*/ |
440 |
if (rsinfo_ncols != ncols) |
441 |
ereport(ERROR, |
442 |
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
443 |
errmsg("invalid input array"), |
444 |
errdetail("Number of elements in array must match number of query specified columns."))); |
445 |
|
446 |
/* OK, use it */ |
447 |
attinmeta = TupleDescGetAttInMetadata(tupdesc); |
448 |
|
449 |
/* Now go to work */ |
450 |
rsinfo->returnMode = SFRM_Materialize; |
451 |
|
452 |
per_query_ctx = fcinfo->flinfo->fn_mcxt; |
453 |
oldcontext = MemoryContextSwitchTo(per_query_ctx); |
454 |
|
455 |
/* initialize our tuplestore */ |
456 |
tupstore = tuplestore_begin_heap(true, false, SortMem); |
457 |
|
458 |
|
459 |
/* take rest of arguments from function */ |
460 |
|
461 |
/* node URL */ |
462 |
if (PG_ARGISNULL(_arg_node_uri)) { |
463 |
ereport(ERROR, |
464 |
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
465 |
errmsg("node URL can't be null"), |
466 |
errdetail("Node URL must be valid URL to HyperEstraier node"))); |
467 |
} |
468 |
node_url = _textout(PG_GETARG_TEXT_P(_arg_node_uri)); |
469 |
|
470 |
/* login and password */ |
471 |
if (PG_ARGISNULL(_arg_login) || PG_ARGISNULL(_arg_passwd)) { |
472 |
ereport(ERROR, |
473 |
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
474 |
errmsg("username and password can't be NULL"), |
475 |
errdetail("You must specify valid username and password to HyperEstraier node"))); |
476 |
} |
477 |
user = _textout(PG_GETARG_TEXT_P(_arg_login)); |
478 |
passwd = _textout(PG_GETARG_TEXT_P(_arg_passwd)); |
479 |
|
480 |
/* depth of search */ |
481 |
if (PG_ARGISNULL(_arg_depth)) { |
482 |
depth = 0; |
483 |
} else { |
484 |
depth = PG_GETARG_INT32(_arg_depth); |
485 |
} |
486 |
|
487 |
/* query string */ |
488 |
if (PG_ARGISNULL(_arg_query)) { |
489 |
query = ""; |
490 |
} else { |
491 |
query = _textout(PG_GETARG_TEXT_P(_arg_query)); |
492 |
} |
493 |
|
494 |
/* atribute filter */ |
495 |
if (PG_ARGISNULL(_arg_attr)) { |
496 |
attr = ""; |
497 |
} else { |
498 |
attr = _textout(PG_GETARG_TEXT_P(_arg_attr)); |
499 |
} |
500 |
|
501 |
/* sort order */ |
502 |
if (PG_ARGISNULL(_arg_order)) { |
503 |
order = ""; |
504 |
} else { |
505 |
order = _textout(PG_GETARG_TEXT_P(_arg_order)); |
506 |
} |
507 |
|
508 |
|
509 |
/* limit */ |
510 |
if (PG_ARGISNULL(_arg_limit)) { |
511 |
limit = 0; |
512 |
} else { |
513 |
limit = PG_GETARG_INT32(_arg_limit); |
514 |
} |
515 |
|
516 |
/* offset */ |
517 |
if (PG_ARGISNULL(_arg_offset)) { |
518 |
offset = 0; |
519 |
} else { |
520 |
offset = PG_GETARG_INT32(_arg_offset); |
521 |
} |
522 |
|
523 |
/* initialize the network environment */ |
524 |
if(!est_init_net_env()){ |
525 |
ereport(ERROR, (errcode(ERRCODE_QUERY_CANCELED), |
526 |
errmsg("pgest_node: can't create network enviroment"))); |
527 |
} |
528 |
|
529 |
/* create the node connection object */ |
530 |
elog(DEBUG1, "pgest_node: est_node_new(%s) as %s", node_url, user); |
531 |
node = est_node_new(node_url); |
532 |
est_node_set_auth(node, user, passwd); |
533 |
|
534 |
elog(DEBUG1, "pgest_node: node: %s (d:%d) query[%s] attr[%s] limit %d offset %d", node_url, depth, query, (PG_ARGISNULL(_arg_attr) ? "NULL" : attr), limit, offset); |
535 |
|
536 |
/* create a search condition object */ |
537 |
if (!(cond = est_cond_new())) { |
538 |
ereport(ERROR, (errcode(ERRCODE_QUERY_CANCELED), |
539 |
errmsg("pgest_node: est_cond_new failed"))); |
540 |
} |
541 |
|
542 |
/* set the search phrase to the search condition object */ |
543 |
if (! PG_ARGISNULL(_arg_query) && strlen(query) > 0) |
544 |
est_cond_set_phrase(cond, query); |
545 |
|
546 |
/* minimum valid attribute length is 10: @a STREQ a */ |
547 |
if (! PG_ARGISNULL(_arg_attr) && strlen(attr) >= 10) { |
548 |
elog(DEBUG1,"attributes: %s", attr); |
549 |
cond_add_attr(cond, attr); |
550 |
} |
551 |
|
552 |
/* set the search phrase to the search condition object */ |
553 |
if (! PG_ARGISNULL(_arg_order) && strlen(order) > 0) { |
554 |
elog(DEBUG1,"est_cond_set_order(%s)", order); |
555 |
est_cond_set_order(cond, order); |
556 |
} |
557 |
|
558 |
if (limit) { |
559 |
elog(DEBUG1,"est_cond_set_max(%d)", limit + offset); |
560 |
est_cond_set_max(cond, limit + offset); |
561 |
} |
562 |
|
563 |
if (offset) { |
564 |
elog(DEBUG1,"est_cond_set_skip(%d)", offset); |
565 |
est_cond_set_skip(cond, offset); |
566 |
} |
567 |
|
568 |
/* get the result of search */ |
569 |
nres = est_node_search(node, cond, depth); |
570 |
|
571 |
if (! nres) { |
572 |
int status = est_node_status(node); |
573 |
est_cond_delete(cond); |
574 |
est_node_delete(node); |
575 |
est_free_net_env(); |
576 |
ereport(ERROR, (errcode(ERRCODE_QUERY_CANCELED), |
577 |
errmsg("pgest_node: search failed, node status %d", status))); |
578 |
} |
579 |
|
580 |
/* get number of results */ |
581 |
resnum = est_noderes_doc_num(nres); |
582 |
|
583 |
/* check if results exists */ |
584 |
if ( 0 == resnum ) { |
585 |
elog(INFO, "pgest_node: no results for: %s", query ); |
586 |
} |
587 |
|
588 |
/* total number of tuples to be returned */ |
589 |
if (limit && limit < resnum) { |
590 |
nrows = limit; |
591 |
} else { |
592 |
nrows = resnum - offset; |
593 |
} |
594 |
|
595 |
/* get hints */ |
596 |
hints = est_noderes_hints(nres); |
597 |
|
598 |
elog(DEBUG1, "pgest_node: found %d hits for %s", resnum, query); |
599 |
|
600 |
|
601 |
values = (char **) palloc(ncols * sizeof(char *)); |
602 |
|
603 |
for (i = 0; i < nrows; i++) |
604 |
{ |
605 |
|
606 |
/* get result from estraier */ |
607 |
if (! ( rdoc = est_noderes_get_doc(nres, i) )) { |
608 |
elog(INFO, "pgest_node: can't find result %d", i + offset); |
609 |
} else { |
610 |
elog(DEBUG1, "URI: %s\n Title: %s\n", |
611 |
est_resdoc_attr(rdoc, "@uri"), |
612 |
est_resdoc_attr(rdoc, "@title") |
613 |
); |
614 |
} |
615 |
|
616 |
/* iterate over results */ |
617 |
for (j = 0; j < ncols; j++) |
618 |
{ |
619 |
bool isnull; |
620 |
char *attr; /* current attribute name */ |
621 |
char *hint; /* position of current hint in attribute */ |
622 |
char *hint_val; |
623 |
|
624 |
/* array value of this position */ |
625 |
indx[0] = j + attr_dim_lower_bounds[0]; |
626 |
|
627 |
dvalue = array_ref(attr_arr, attr_ndims, indx, -1, attr_len, attr_byval, attr_align, &isnull); |
628 |
attr = (char *)DirectFunctionCall1(textout, dvalue); |
629 |
|
630 |
if (!isnull && (hint = strstr(attr, HINTS_PREFIX)) != NULL) { |
631 |
/* skip HINTS. prefix */ |
632 |
hint += strlen(HINTS_PREFIX); |
633 |
|
634 |
hint_val = cbmapget(hints, hint, -1, NULL); |
635 |
elog(DEBUG2, "hint %s = %s", hint, hint_val); |
636 |
|
637 |
if (hint_val != NULL) { |
638 |
values[j] = DatumGetCString( hint_val ); |
639 |
} else { |
640 |
elog(INFO, "can't get hint in results: %s", hint); |
641 |
values[j] = NULL; |
642 |
} |
643 |
} else if (!isnull && rdoc) |
644 |
values[j] = DatumGetCString( node_attr2text(rdoc, attr) ); |
645 |
else |
646 |
values[j] = NULL; |
647 |
} |
648 |
/* construct the tuple */ |
649 |
tuple = BuildTupleFromCStrings(attinmeta, values); |
650 |
|
651 |
/* now store it */ |
652 |
tuplestore_puttuple(tupstore, tuple); |
653 |
|
654 |
} |
655 |
|
656 |
tuplestore_donestoring(tupstore); |
657 |
rsinfo->setResult = tupstore; |
658 |
|
659 |
/* |
660 |
* SFRM_Materialize mode expects us to return a NULL Datum. The actual |
661 |
* tuples are in our tuplestore and passed back through |
662 |
* rsinfo->setResult. rsinfo->setDesc is set to the tuple description |
663 |
* that we actually used to build our tuples with, so the caller can |
664 |
* verify we did what it was expecting. |
665 |
*/ |
666 |
rsinfo->setDesc = tupdesc; |
667 |
MemoryContextSwitchTo(oldcontext); |
668 |
|
669 |
/* delete the node result object */ |
670 |
est_noderes_delete(nres); |
671 |
|
672 |
/* destroy the search condition object */ |
673 |
est_cond_delete(cond); |
674 |
|
675 |
/* destroy the node object */ |
676 |
est_node_delete(node); |
677 |
|
678 |
/* free the networking environment */ |
679 |
est_free_net_env(); |
680 |
|
681 |
return (Datum) 0; |
682 |
} |
683 |
|
684 |
/* make text var from node attr */ |
685 |
char *node_attr2text(ESTRESDOC *rdoc, char *attr) { |
686 |
char *val; |
687 |
const char *attrval; |
688 |
int len; |
689 |
int attrlen; |
690 |
|
691 |
if (! rdoc) return (Datum) NULL; |
692 |
|
693 |
elog(DEBUG1, "doc: %p, attr: %s", rdoc, attr); |
694 |
|
695 |
if ( (attrval = est_resdoc_attr(rdoc, attr)) && (attrlen = strlen(attrval)) ) { |
696 |
val = (char *) palloc(attrlen * sizeof(char)); |
697 |
} else { |
698 |
return (Datum) NULL; |
699 |
} |
700 |
|
701 |
len = strlen(attrval); |
702 |
elog(DEBUG1, "node_attr2text(%s) = '%s' %d bytes", attr, attrval, len); |
703 |
|
704 |
len++; |
705 |
len *= sizeof(char); |
706 |
|
707 |
elog(DEBUG2, "palloc(%d)", len); |
708 |
|
709 |
val = palloc(len); |
710 |
|
711 |
memset(val, 0, len); |
712 |
strncpy(val, attrval, len); |
713 |
|
714 |
elog(DEBUG2, "val=%s", val); |
715 |
|
716 |
return val; |
717 |
} |
718 |
|
719 |
/* parse attributes and add them to confition */ |
720 |
void cond_add_attr(ESTCOND *cond, char *attr) { |
721 |
char *next; |
722 |
char *curr_attr; |
723 |
while ( strlen(attr) > 0 ) { |
724 |
printf("len [%s] = %d\n", attr, strlen(attr)); |
725 |
if ((next = strstr(attr, ATTR_DELIMITER)) != NULL) { |
726 |
curr_attr = palloc( next - attr + 1 ); |
727 |
memcpy(curr_attr, attr, next-attr); |
728 |
curr_attr[next-attr] = '\0'; |
729 |
next += strlen(ATTR_DELIMITER); |
730 |
} else { |
731 |
next = ""; |
732 |
curr_attr = attr; |
733 |
} |
734 |
elog(DEBUG1, "est_cond_add_attr(%s)", curr_attr); |
735 |
est_cond_add_attr(cond, curr_attr); |
736 |
attr = next; |
737 |
} |
738 |
} |