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/* |
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* integrate Hyper Estraier into PostgreSQL |
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* |
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* Dobrica Pavlinusic <dpavlin@rot13.org> 2005-05-19 |
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* |
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* TODO: |
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* - all |
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* |
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* NOTES: |
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* - clear structures with memset to support hash indexes (who whould like |
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* to create hash index on table returned from function?) |
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* - number of returned rows is set by PostgreSQL evaluator, see: |
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* http://archives.postgresql.org/pgsql-hackers/2005-02/msg00546.php |
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* |
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* Based on: |
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* - C example from PostgreSQL documentation (BSD licence) |
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* - example002.c from Hyper Estraier (GPL) |
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* - _textin/_textout from pgcurl.c (LGPL) |
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* |
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* This code is licenced under GPL |
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*/ |
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|
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#include "postgres.h" |
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#include "fmgr.h" |
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#include "funcapi.h" |
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#include "utils/builtins.h" |
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#include "utils/array.h" |
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#include "miscadmin.h" |
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#include <estraier.h> |
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#include <cabin.h> |
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|
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#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str)) |
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#define _textout(str) DatumGetPointer(DirectFunctionCall1(textout, PointerGetDatum(str))) |
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#define GET_STR(textp) DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp))) |
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#define GET_TEXT(cstrp) DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(cstrp))) |
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|
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/* prototype */ |
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char *attr2text(ESTDOC *doc, char *attr); |
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|
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ESTDB *db; |
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ESTCOND *cond; |
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ESTDOC *doc; |
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const CBLIST *texts; |
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int ecode, *est_result, resnum, i, j; |
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int limit = 0; |
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int offset = 0; |
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|
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/* define PostgreSQL v1 function */ |
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PG_FUNCTION_INFO_V1(pgest); |
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Datum pgest(PG_FUNCTION_ARGS) { |
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|
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FuncCallContext *funcctx; |
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int call_cntr; |
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int max_calls; |
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TupleDesc tupdesc; |
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TupleTableSlot *slot; |
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AttInMetadata *attinmeta; |
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char *index_path; |
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char *query; |
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char *attr; |
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|
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/* stuff done only on the first call of the function */ |
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if (SRF_IS_FIRSTCALL()) { |
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MemoryContext oldcontext; |
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|
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/* take arguments from function */ |
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//index_path = _textout(PG_GETARG_TEXT_P(0)); |
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index_path = _textout(PG_GETARG_TEXT_P(0)); |
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query = _textout(PG_GETARG_TEXT_P(1)); |
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attr = _textout(PG_GETARG_TEXT_P(2)); |
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limit = PG_GETARG_INT32(3); |
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offset = PG_GETARG_INT32(4); |
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|
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/* create a function context for cross-call persistence */ |
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funcctx = SRF_FIRSTCALL_INIT(); |
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|
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/* switch to memory context appropriate for multiple function calls */ |
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oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx); |
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|
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/* open the database */ |
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elog(DEBUG1, "pgest: est_db_open(%s)", index_path); |
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|
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if(!(db = est_db_open(index_path, ESTDBREADER, &ecode))){ |
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elog(ERROR, "est_db_open: can't open %s [%d]: %s", index_path, ecode, est_err_msg(ecode)); |
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SRF_RETURN_DONE(funcctx); |
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} |
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|
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elog(INFO, "pgest: query[%s] attr[%s] limit %d offset %d", query, attr, limit, offset); |
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|
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/* create a search condition object */ |
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if (!(cond = est_cond_new())) { |
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elog(INFO, "pgest: est_cond_new failed"); |
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SRF_RETURN_DONE(funcctx); |
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} |
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|
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/* set the search phrase to the search condition object */ |
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if (strlen(query) > 0) |
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est_cond_set_phrase(cond, query); |
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|
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/* minimum valid attribute length is 10: @a STREQ a */ |
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if (attr != NULL && strlen(attr) >= 10) { |
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elog(INFO,"est_cond_add_attr(%s)", attr); |
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est_cond_add_attr(cond, attr); |
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} |
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|
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/* get the result of search */ |
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est_result = est_db_search(db, cond, &resnum, NULL); |
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|
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/* total number of tuples to be returned */ |
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if (limit && limit < resnum) { |
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funcctx->max_calls = limit - offset; |
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} else { |
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funcctx->max_calls = resnum - offset; |
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} |
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|
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/* check if results exists */ |
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if ( 0 == funcctx->max_calls ) |
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elog(INFO, "pgest: no results for: %s", query ); |
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|
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elog(DEBUG1, "pgest: found %d hits for %s", resnum, query); |
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|
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/* Build a tuple description for a __pgest tuple */ |
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tupdesc = RelationNameGetTupleDesc("__pgest"); |
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|
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/* allocate a slot for a tuple with this tupdesc */ |
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slot = TupleDescGetSlot(tupdesc); |
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|
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/* assign slot to function context */ |
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funcctx->slot = slot; |
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|
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/* |
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* generate attribute metadata needed later to produce tuples from raw |
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* C strings |
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*/ |
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attinmeta = TupleDescGetAttInMetadata(tupdesc); |
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funcctx->attinmeta = attinmeta; |
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|
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MemoryContextSwitchTo(oldcontext); |
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|
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elog(DEBUG1, "SRF_IS_FIRSTCALL done"); |
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} |
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|
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/* stuff done on every call of the function */ |
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funcctx = SRF_PERCALL_SETUP(); |
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|
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call_cntr = funcctx->call_cntr; |
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max_calls = funcctx->max_calls; |
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slot = funcctx->slot; |
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attinmeta = funcctx->attinmeta; |
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|
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if (limit && call_cntr > limit - 1) { |
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elog(INFO, "call_cntr: %d limit: %d", call_cntr, limit); |
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SRF_RETURN_DONE(funcctx); |
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} |
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|
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if (call_cntr < max_calls) { |
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char **values; |
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HeapTuple tuple; |
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Datum result; |
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|
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elog(DEBUG1, "pgest: loop count %d", call_cntr); |
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|
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if (! est_result) { |
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elog(ERROR, "pgest: no estraier results"); |
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SRF_RETURN_DONE(funcctx); |
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} |
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|
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/* |
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* Prepare a values array for storage in our slot. |
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* This should be an array of C strings which will |
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* be processed later by the type input functions. |
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*/ |
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|
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if (doc = est_db_get_doc(db, est_result[call_cntr + offset], 0)) { |
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|
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elog(DEBUG1, "URI: %s\n Title: %s\n", |
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est_doc_attr(doc, "@uri"), |
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est_doc_attr(doc, "@title") |
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); |
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|
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values = (char **) palloc(4 * sizeof(char *)); |
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|
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// values[0] = (char *) palloc(strlen(_estval) * sizeof(char)); |
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|
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values[0] = (char *) attr2text(doc,"@id"); |
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values[1] = (char *) attr2text(doc,"@uri"); |
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values[2] = (char *) attr2text(doc,"@title"); |
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values[3] = (char *) attr2text(doc,"@type"); |
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|
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/* destloy the document object */ |
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elog(DEBUG2, "est_doc_delete"); |
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est_doc_delete(doc); |
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} else { |
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elog(INFO, "no result from estraier"); |
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values[0] = DatumGetCString( "" ); |
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values[1] = DatumGetCString( "" ); |
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values[2] = DatumGetCString( "" ); |
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values[3] = DatumGetCString( "" ); |
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} |
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|
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|
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elog(DEBUG2, "build tuple"); |
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/* build a tuple */ |
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tuple = BuildTupleFromCStrings(attinmeta, values); |
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|
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elog(DEBUG2, "make tuple into datum"); |
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/* make the tuple into a datum */ |
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result = TupleGetDatum(slot, tuple); |
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|
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elog(DEBUG2, "cleanup"); |
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/* clean up ? */ |
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/* |
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pfree(values[0]); |
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pfree(values[1]); |
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pfree(values[2]); |
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pfree(values[3]); |
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pfree(values); |
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*/ |
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|
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elog(DEBUG2, "cleanup over"); |
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|
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SRF_RETURN_NEXT(funcctx, result); |
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} else { |
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elog(DEBUG1, "loop over"); |
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|
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if(!est_db_close(db, &ecode)){ |
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elog(INFO, "est_db_close error: %s", est_err_msg(ecode)); |
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} |
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|
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/* do when there is no more left */ |
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SRF_RETURN_DONE(funcctx); |
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} |
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} |
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|
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/* work in progress */ |
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PG_FUNCTION_INFO_V1(pgest2); |
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Datum pgest2(PG_FUNCTION_ARGS) |
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{ |
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int nrows = 3; |
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int16 typlen; |
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bool typbyval; |
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char typalign; |
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ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; |
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AttInMetadata *attinmeta; |
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TupleDesc tupdesc; |
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Tuplestorestate *tupstore = NULL; |
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HeapTuple tuple; |
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MemoryContext per_query_ctx; |
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MemoryContext oldcontext; |
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Datum dvalue; |
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char **values; |
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int ncols; |
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int i, j; |
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|
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/* check to see if caller supports us returning a tuplestore */ |
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if (!rsinfo || !(rsinfo->allowedModes & SFRM_Materialize)) |
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ereport(ERROR, |
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(errcode(ERRCODE_SYNTAX_ERROR), |
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errmsg("materialize mode required, but it is not " \ |
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"allowed in this context"))); |
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|
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/* get the requested return tuple description */ |
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tupdesc = rsinfo->expectedDesc; |
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ncols = tupdesc->natts; |
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|
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/* |
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* The requested tuple description better match up with the array |
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* we were given. |
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*/ |
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/* OK, use it */ |
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attinmeta = TupleDescGetAttInMetadata(tupdesc); |
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|
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/* Now go to work */ |
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rsinfo->returnMode = SFRM_Materialize; |
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|
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per_query_ctx = fcinfo->flinfo->fn_mcxt; |
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oldcontext = MemoryContextSwitchTo(per_query_ctx); |
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|
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/* initialize our tuplestore */ |
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tupstore = tuplestore_begin_heap(true, false, SortMem); |
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|
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values = (char **) palloc(ncols * sizeof(char *)); |
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|
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for (i = 0; i < nrows; i++) |
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{ |
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for (j = 0; j < ncols; j++) |
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{ |
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values[j] = DatumGetCString( "foo" ); |
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} |
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/* construct the tuple */ |
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tuple = BuildTupleFromCStrings(attinmeta, values); |
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|
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/* now store it */ |
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tuplestore_puttuple(tupstore, tuple); |
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} |
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|
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tuplestore_donestoring(tupstore); |
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rsinfo->setResult = tupstore; |
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|
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/* |
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* SFRM_Materialize mode expects us to return a NULL Datum. The actual |
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* tuples are in our tuplestore and passed back through |
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* rsinfo->setResult. rsinfo->setDesc is set to the tuple description |
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* that we actually used to build our tuples with, so the caller can |
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* verify we did what it was expecting. |
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*/ |
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rsinfo->setDesc = tupdesc; |
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MemoryContextSwitchTo(oldcontext); |
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|
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return (Datum) 0; |
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} |
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|
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|
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/* make text var from attr */ |
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char *attr2text(ESTDOC *doc, char *attr) { |
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char *val; |
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const char *attrval; |
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int len; |
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int attrlen; |
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|
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elog(DEBUG1, "doc: %08x, attr: %s", doc, attr); |
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|
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if ( (attrval = est_doc_attr(doc, attr)) && (attrlen = strlen(attrval)) ) { |
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val = (char *) palloc(attrlen * sizeof(char)); |
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} else { |
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return (Datum) NULL; |
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} |
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|
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len = strlen(attrval); |
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elog(DEBUG1, "attr2text(%s) = '%s' %d bytes", attr, attrval, len); |
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|
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len++; |
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len *= sizeof(char); |
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|
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elog(DEBUG2, "palloc(%d)", len); |
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|
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val = palloc(len); |
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|
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memset(val, 0, len); |
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strncpy(val, attrval, len); |
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|
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elog(DEBUG2, "val=%s", val); |
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|
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return val; |
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} |
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|
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/* make integer variable from property */ |
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/* |
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char *prop2int(SW_RESULT sw_res, char *propname) { |
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char *val; |
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unsigned long prop; |
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int len; |
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|
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elog(DEBUG2, "prop2int(%s)", propname); |
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|
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prop = estResultPropertyULong( sw_res, propname ); |
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if (error_or_abort( est_handle )) return NULL; |
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|
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elog(DEBUG1, "prop2int(%s) = %lu", propname, prop); |
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|
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len = 128 * sizeof(char); |
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elog(DEBUG2, "palloc(%d)", len); |
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|
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val = palloc(len); |
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memset(val, 0, len); |
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|
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snprintf(val, len, "%lu", prop); |
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|
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elog(DEBUG2, "val=%s", val); |
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|
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return val; |
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} |
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*/ |
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