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dpavlin |
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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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#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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#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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dpavlin |
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/* prototype */ |
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char *attr2text(ESTDOC *doc, char *attr); |
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dpavlin |
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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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dpavlin |
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int limit = 0; |
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int offset = 0; |
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dpavlin |
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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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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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dpavlin |
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char *attr; |
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dpavlin |
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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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/* create a function context for cross-call persistence */ |
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funcctx = SRF_FIRSTCALL_INIT(); |
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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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dpavlin |
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/* take arguments from function */ |
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dpavlin |
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|
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dpavlin |
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/* index path */ |
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if (PG_ARGISNULL(0)) { |
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elog(ERROR, "index path can't be null"); |
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SRF_RETURN_DONE(funcctx); |
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} |
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index_path = _textout(PG_GETARG_TEXT_P(0)); |
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/* query string */ |
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if (PG_ARGISNULL(0)) { |
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query = ""; |
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} else { |
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query = _textout(PG_GETARG_TEXT_P(1)); |
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} |
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/* atribute filter */ |
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if (PG_ARGISNULL(2)) { |
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attr = ""; |
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} else { |
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attr = _textout(PG_GETARG_TEXT_P(2)); |
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} |
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/* limit */ |
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dpavlin |
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if (PG_ARGISNULL(3)) { |
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limit = 0; |
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} else { |
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limit = PG_GETARG_INT32(3); |
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} |
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dpavlin |
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/* offset */ |
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dpavlin |
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if (PG_ARGISNULL(4)) { |
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offset = 0; |
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} else { |
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offset = PG_GETARG_INT32(4); |
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} |
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dpavlin |
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dpavlin |
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/* open the database */ |
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elog(DEBUG1, "pgest: est_db_open(%s)", index_path); |
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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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dpavlin |
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elog(INFO, "pgest: query[%s] attr[%s] limit %d offset %d", query, (PG_ARGISNULL(2) ? "NULL" : attr), limit, offset); |
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dpavlin |
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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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/* set the search phrase to the search condition object */ |
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dpavlin |
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if (! PG_ARGISNULL(1) && strlen(query) > 0) |
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dpavlin |
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est_cond_set_phrase(cond, query); |
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dpavlin |
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|
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dpavlin |
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/* minimum valid attribute length is 10: @a STREQ a */ |
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dpavlin |
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if (! PG_ARGISNULL(2) && strlen(attr) >= 10) { |
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dpavlin |
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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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dpavlin |
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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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/* total number of tuples to be returned */ |
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dpavlin |
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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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dpavlin |
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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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dpavlin |
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elog(DEBUG1, "pgest: found %d hits for %s", resnum, query); |
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dpavlin |
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/* Build a tuple description for a __pgest tuple */ |
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tupdesc = RelationNameGetTupleDesc("__pgest"); |
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/* allocate a slot for a tuple with this tupdesc */ |
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slot = TupleDescGetSlot(tupdesc); |
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/* assign slot to function context */ |
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funcctx->slot = slot; |
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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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MemoryContextSwitchTo(oldcontext); |
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dpavlin |
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elog(DEBUG1, "SRF_IS_FIRSTCALL done"); |
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dpavlin |
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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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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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dpavlin |
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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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dpavlin |
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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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dpavlin |
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elog(DEBUG1, "pgest: loop count %d", call_cntr); |
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dpavlin |
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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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* 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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dpavlin |
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if (doc = est_db_get_doc(db, est_result[call_cntr + offset], 0)) { |
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dpavlin |
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|
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dpavlin |
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elog(DEBUG1, "URI: %s\n Title: %s\n", |
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dpavlin |
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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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values = (char **) palloc(4 * sizeof(char *)); |
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// values[0] = (char *) palloc(strlen(_estval) * sizeof(char)); |
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dpavlin |
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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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dpavlin |
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values[3] = (char *) attr2text(doc,"@size"); |
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dpavlin |
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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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dpavlin |
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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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dpavlin |
1 |
} |
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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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elog(DEBUG2, "make tuple into datum"); |
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/* make the tuple into a datum */ |
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result = TupleGetDatum(slot, tuple); |
238 |
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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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elog(DEBUG2, "cleanup over"); |
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SRF_RETURN_NEXT(funcctx, result); |
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} else { |
253 |
dpavlin |
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elog(DEBUG1, "loop over"); |
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dpavlin |
1 |
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255 |
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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)); |
257 |
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} |
258 |
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259 |
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/* do when there is no more left */ |
260 |
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SRF_RETURN_DONE(funcctx); |
261 |
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} |
262 |
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} |
263 |
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264 |
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/* work in progress */ |
265 |
dpavlin |
19 |
PG_FUNCTION_INFO_V1(pgest_attr); |
266 |
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Datum pgest_attr(PG_FUNCTION_ARGS) |
267 |
dpavlin |
1 |
{ |
268 |
dpavlin |
19 |
ArrayType *attr_arr = PG_GETARG_ARRAYTYPE_P(5); |
269 |
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Oid element_type = ARR_ELEMTYPE(attr_arr); |
270 |
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int ndims = ARR_NDIM(attr_arr); |
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int *dim_counts = ARR_DIMS(attr_arr); |
272 |
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int *dim_lower_bounds = ARR_LBOUND(attr_arr); |
273 |
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int ncols = 0; |
274 |
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int nrows = 0; |
275 |
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int indx[MAXDIM]; |
276 |
dpavlin |
1 |
int16 typlen; |
277 |
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bool typbyval; |
278 |
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char typalign; |
279 |
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ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; |
280 |
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AttInMetadata *attinmeta; |
281 |
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TupleDesc tupdesc; |
282 |
dpavlin |
19 |
Tuplestorestate *tupstore = NULL; |
283 |
dpavlin |
1 |
HeapTuple tuple; |
284 |
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MemoryContext per_query_ctx; |
285 |
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MemoryContext oldcontext; |
286 |
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Datum dvalue; |
287 |
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char **values; |
288 |
dpavlin |
19 |
int rsinfo_ncols; |
289 |
dpavlin |
1 |
int i, j; |
290 |
dpavlin |
19 |
/* estvars */ |
291 |
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char *index_path; |
292 |
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char *query; |
293 |
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char *attr; |
294 |
dpavlin |
1 |
|
295 |
dpavlin |
19 |
|
296 |
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/* only allow 1D input array */ |
297 |
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if (ndims == 1) |
298 |
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{ |
299 |
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ncols = dim_counts[0]; |
300 |
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} |
301 |
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else |
302 |
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ereport(ERROR, |
303 |
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
304 |
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errmsg("invalid input array"), |
305 |
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errdetail("Input array must have 1 dimension"))); |
306 |
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307 |
dpavlin |
1 |
/* check to see if caller supports us returning a tuplestore */ |
308 |
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if (!rsinfo || !(rsinfo->allowedModes & SFRM_Materialize)) |
309 |
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ereport(ERROR, |
310 |
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(errcode(ERRCODE_SYNTAX_ERROR), |
311 |
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errmsg("materialize mode required, but it is not " \ |
312 |
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"allowed in this context"))); |
313 |
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314 |
dpavlin |
19 |
/* get info about element type needed to construct the array */ |
315 |
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get_typlenbyvalalign(element_type, &typlen, &typbyval, &typalign); |
316 |
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317 |
dpavlin |
1 |
/* get the requested return tuple description */ |
318 |
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tupdesc = rsinfo->expectedDesc; |
319 |
dpavlin |
19 |
rsinfo_ncols = tupdesc->natts; |
320 |
dpavlin |
1 |
|
321 |
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/* |
322 |
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* The requested tuple description better match up with the array |
323 |
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* we were given. |
324 |
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*/ |
325 |
dpavlin |
19 |
if (rsinfo_ncols != ncols) |
326 |
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ereport(ERROR, |
327 |
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
328 |
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errmsg("invalid input array"), |
329 |
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errdetail("Number of elements in array must match number of query specified columns."))); |
330 |
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|
331 |
dpavlin |
1 |
/* OK, use it */ |
332 |
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attinmeta = TupleDescGetAttInMetadata(tupdesc); |
333 |
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334 |
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/* Now go to work */ |
335 |
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rsinfo->returnMode = SFRM_Materialize; |
336 |
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|
337 |
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per_query_ctx = fcinfo->flinfo->fn_mcxt; |
338 |
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oldcontext = MemoryContextSwitchTo(per_query_ctx); |
339 |
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340 |
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/* initialize our tuplestore */ |
341 |
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tupstore = tuplestore_begin_heap(true, false, SortMem); |
342 |
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343 |
dpavlin |
19 |
|
344 |
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/* take rest of arguments from function */ |
345 |
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346 |
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/* index path */ |
347 |
|
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if (PG_ARGISNULL(0)) { |
348 |
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ereport(ERROR, |
349 |
|
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
350 |
|
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errmsg("index path can't be null"), |
351 |
|
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errdetail("Index path must be valid full path to HyperEstraier index"))); |
352 |
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} |
353 |
|
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index_path = _textout(PG_GETARG_TEXT_P(0)); |
354 |
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|
355 |
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/* query string */ |
356 |
|
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if (PG_ARGISNULL(0)) { |
357 |
|
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query = ""; |
358 |
|
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} else { |
359 |
|
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query = _textout(PG_GETARG_TEXT_P(1)); |
360 |
|
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} |
361 |
|
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|
362 |
|
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/* atribute filter */ |
363 |
|
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if (PG_ARGISNULL(2)) { |
364 |
|
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attr = ""; |
365 |
|
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} else { |
366 |
|
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attr = _textout(PG_GETARG_TEXT_P(2)); |
367 |
|
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} |
368 |
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|
369 |
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/* limit */ |
370 |
|
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if (PG_ARGISNULL(3)) { |
371 |
|
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limit = 0; |
372 |
|
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} else { |
373 |
|
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limit = PG_GETARG_INT32(3); |
374 |
|
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} |
375 |
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|
376 |
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/* offset */ |
377 |
|
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if (PG_ARGISNULL(4)) { |
378 |
|
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offset = 0; |
379 |
|
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} else { |
380 |
|
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offset = PG_GETARG_INT32(4); |
381 |
|
|
} |
382 |
|
|
|
383 |
|
|
|
384 |
|
|
/* open the database */ |
385 |
|
|
elog(DEBUG1, "pgest_attr: est_db_open(%s)", index_path); |
386 |
|
|
|
387 |
|
|
if(!(db = est_db_open(index_path, ESTDBREADER, &ecode))){ |
388 |
|
|
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
389 |
|
|
errmsg("est_db_open: can't open %s: %d", index_path, ecode), |
390 |
|
|
errdetail(est_err_msg(ecode)))); |
391 |
|
|
} |
392 |
|
|
|
393 |
|
|
elog(INFO, "pgest_attr: query[%s] attr[%s] limit %d offset %d", query, (PG_ARGISNULL(2) ? "NULL" : attr), limit, offset); |
394 |
|
|
|
395 |
|
|
/* create a search condition object */ |
396 |
|
|
if (!(cond = est_cond_new())) { |
397 |
|
|
ereport(ERROR, (errcode(ERRCODE_QUERY_CANCELED), |
398 |
|
|
errmsg("pgest_attr: est_cond_new failed"))); |
399 |
|
|
} |
400 |
|
|
|
401 |
|
|
/* set the search phrase to the search condition object */ |
402 |
|
|
if (! PG_ARGISNULL(1) && strlen(query) > 0) |
403 |
|
|
est_cond_set_phrase(cond, query); |
404 |
|
|
|
405 |
|
|
/* minimum valid attribute length is 10: @a STREQ a */ |
406 |
|
|
if (! PG_ARGISNULL(2) && strlen(attr) >= 10) { |
407 |
|
|
elog(INFO,"est_cond_add_attr(%s)", attr); |
408 |
|
|
est_cond_add_attr(cond, attr); |
409 |
|
|
} |
410 |
|
|
|
411 |
|
|
/* get the result of search */ |
412 |
|
|
est_result = est_db_search(db, cond, &resnum, NULL); |
413 |
|
|
|
414 |
|
|
/* check if results exists */ |
415 |
|
|
if ( 0 == resnum ) { |
416 |
|
|
elog(INFO, "pgest_attr: no results for: %s", query ); |
417 |
|
|
} |
418 |
|
|
|
419 |
|
|
/* total number of tuples to be returned */ |
420 |
|
|
if (limit && limit < resnum) { |
421 |
|
|
nrows = limit - offset; |
422 |
|
|
} else { |
423 |
|
|
nrows = resnum - offset; |
424 |
|
|
} |
425 |
|
|
|
426 |
|
|
|
427 |
|
|
elog(DEBUG1, "pgest_attr: found %d hits for %s", resnum, query); |
428 |
|
|
|
429 |
|
|
|
430 |
dpavlin |
1 |
values = (char **) palloc(ncols * sizeof(char *)); |
431 |
|
|
|
432 |
|
|
for (i = 0; i < nrows; i++) |
433 |
|
|
{ |
434 |
dpavlin |
19 |
|
435 |
|
|
/* get result from estraier */ |
436 |
|
|
if (! ( doc = est_db_get_doc(db, est_result[i + offset], 0)) ) { |
437 |
|
|
elog(INFO, "can't find result %d", i + offset); |
438 |
|
|
} else { |
439 |
|
|
elog(DEBUG1, "URI: %s\n Title: %s\n", |
440 |
|
|
est_doc_attr(doc, "@uri"), |
441 |
|
|
est_doc_attr(doc, "@title") |
442 |
|
|
); |
443 |
|
|
} |
444 |
|
|
|
445 |
|
|
/* iterate over results */ |
446 |
dpavlin |
1 |
for (j = 0; j < ncols; j++) |
447 |
|
|
{ |
448 |
dpavlin |
19 |
bool isnull; |
449 |
|
|
|
450 |
|
|
/* array value of this position */ |
451 |
|
|
indx[0] = j + dim_lower_bounds[0]; |
452 |
|
|
|
453 |
|
|
dvalue = array_ref(attr_arr, ndims, indx, -1, typlen, typbyval, typalign, &isnull); |
454 |
|
|
|
455 |
|
|
if (!isnull && doc) |
456 |
|
|
values[j] = DatumGetCString( |
457 |
|
|
attr2text(doc, |
458 |
|
|
DirectFunctionCall1(textout, dvalue) |
459 |
|
|
)); |
460 |
|
|
else |
461 |
|
|
values[j] = NULL; |
462 |
dpavlin |
1 |
} |
463 |
|
|
/* construct the tuple */ |
464 |
|
|
tuple = BuildTupleFromCStrings(attinmeta, values); |
465 |
|
|
|
466 |
|
|
/* now store it */ |
467 |
|
|
tuplestore_puttuple(tupstore, tuple); |
468 |
dpavlin |
19 |
|
469 |
|
|
|
470 |
|
|
/* delete estraier document object */ |
471 |
|
|
est_doc_delete(doc); |
472 |
dpavlin |
1 |
} |
473 |
|
|
|
474 |
|
|
tuplestore_donestoring(tupstore); |
475 |
|
|
rsinfo->setResult = tupstore; |
476 |
|
|
|
477 |
|
|
/* |
478 |
|
|
* SFRM_Materialize mode expects us to return a NULL Datum. The actual |
479 |
|
|
* tuples are in our tuplestore and passed back through |
480 |
|
|
* rsinfo->setResult. rsinfo->setDesc is set to the tuple description |
481 |
|
|
* that we actually used to build our tuples with, so the caller can |
482 |
|
|
* verify we did what it was expecting. |
483 |
|
|
*/ |
484 |
|
|
rsinfo->setDesc = tupdesc; |
485 |
|
|
MemoryContextSwitchTo(oldcontext); |
486 |
|
|
|
487 |
dpavlin |
19 |
if(!est_db_close(db, &ecode)){ |
488 |
|
|
ereport(ERROR, (errcode(ERRCODE_IO_ERROR), |
489 |
|
|
errmsg("est_db_close: %d", ecode), |
490 |
|
|
errdetail(est_err_msg(ecode)))); |
491 |
|
|
} |
492 |
|
|
|
493 |
dpavlin |
1 |
return (Datum) 0; |
494 |
|
|
} |
495 |
|
|
|
496 |
|
|
|
497 |
|
|
/* make text var from attr */ |
498 |
|
|
char *attr2text(ESTDOC *doc, char *attr) { |
499 |
|
|
char *val; |
500 |
|
|
const char *attrval; |
501 |
|
|
int len; |
502 |
dpavlin |
4 |
int attrlen; |
503 |
dpavlin |
1 |
|
504 |
dpavlin |
2 |
elog(DEBUG1, "doc: %08x, attr: %s", doc, attr); |
505 |
dpavlin |
1 |
|
506 |
dpavlin |
4 |
if ( (attrval = est_doc_attr(doc, attr)) && (attrlen = strlen(attrval)) ) { |
507 |
|
|
val = (char *) palloc(attrlen * sizeof(char)); |
508 |
dpavlin |
1 |
} else { |
509 |
|
|
return (Datum) NULL; |
510 |
|
|
} |
511 |
|
|
|
512 |
|
|
len = strlen(attrval); |
513 |
dpavlin |
2 |
elog(DEBUG1, "attr2text(%s) = '%s' %d bytes", attr, attrval, len); |
514 |
dpavlin |
1 |
|
515 |
|
|
len++; |
516 |
|
|
len *= sizeof(char); |
517 |
|
|
|
518 |
|
|
elog(DEBUG2, "palloc(%d)", len); |
519 |
|
|
|
520 |
|
|
val = palloc(len); |
521 |
|
|
|
522 |
|
|
memset(val, 0, len); |
523 |
|
|
strncpy(val, attrval, len); |
524 |
|
|
|
525 |
|
|
elog(DEBUG2, "val=%s", val); |
526 |
|
|
|
527 |
|
|
return val; |
528 |
|
|
} |
529 |
|
|
|