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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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|
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/* work in progress */ |
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PG_FUNCTION_INFO_V1(pgest_attr); |
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Datum pgest_attr(PG_FUNCTION_ARGS) |
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{ |
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ArrayType *attr_arr = PG_GETARG_ARRAYTYPE_P(5); |
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Oid attr_element_type = ARR_ELEMTYPE(attr_arr); |
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int attr_ndims = ARR_NDIM(attr_arr); |
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int *attr_dim_counts = ARR_DIMS(attr_arr); |
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int *attr_dim_lower_bounds = ARR_LBOUND(attr_arr); |
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int ncols = 0; |
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int nrows = 0; |
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int indx[MAXDIM]; |
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int16 attr_len; |
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bool attr_byval; |
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char attr_align; |
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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 rsinfo_ncols; |
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int i, j; |
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/* estvars */ |
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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; |
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int limit = 0; |
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int offset = 0; |
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|
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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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|
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/* only allow 1D input array */ |
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if (attr_ndims == 1) |
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{ |
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ncols = attr_dim_counts[0]; |
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} |
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else |
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ereport(ERROR, |
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
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errmsg("invalid input array"), |
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errdetail("Input array must have 1 dimension"))); |
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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 info about element type needed to construct the array */ |
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get_typlenbyvalalign(attr_element_type, &attr_len, &attr_byval, &attr_align); |
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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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rsinfo_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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if (rsinfo_ncols != ncols) |
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ereport(ERROR, |
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
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errmsg("invalid input array"), |
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errdetail("Number of elements in array must match number of query specified columns."))); |
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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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|
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/* take rest of arguments from function */ |
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|
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/* index path */ |
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if (PG_ARGISNULL(0)) { |
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ereport(ERROR, |
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
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errmsg("index path can't be null"), |
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errdetail("Index path must be valid full path to HyperEstraier index"))); |
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} |
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index_path = _textout(PG_GETARG_TEXT_P(0)); |
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|
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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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|
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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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|
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/* limit */ |
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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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|
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/* offset */ |
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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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|
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|
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/* open the database */ |
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elog(DEBUG1, "pgest_attr: 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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ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), |
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errmsg("est_db_open: can't open %s: %d", index_path, ecode), |
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errdetail(est_err_msg(ecode)))); |
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} |
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|
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elog(DEBUG1, "pgest_attr: query[%s] attr[%s] limit %d offset %d", query, (PG_ARGISNULL(2) ? "NULL" : 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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ereport(ERROR, (errcode(ERRCODE_QUERY_CANCELED), |
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errmsg("pgest_attr: est_cond_new failed"))); |
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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 (! PG_ARGISNULL(1) && 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 (! PG_ARGISNULL(2) && strlen(attr) >= 10) { |
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elog(DEBUG1,"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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/* check if results exists */ |
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if ( 0 == resnum ) { |
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elog(INFO, "pgest_attr: no results for: %s", query ); |
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} |
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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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nrows = limit - offset; |
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} else { |
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nrows = resnum - offset; |
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} |
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|
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|
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elog(DEBUG1, "pgest_attr: found %d hits for %s", resnum, query); |
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|
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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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|
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/* get result from estraier */ |
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if (! ( doc = est_db_get_doc(db, est_result[i + offset], 0)) ) { |
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elog(INFO, "can't find result %d", i + offset); |
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} else { |
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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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|
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/* iterate over results */ |
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for (j = 0; j < ncols; j++) |
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{ |
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bool isnull; |
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|
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/* array value of this position */ |
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indx[0] = j + attr_dim_lower_bounds[0]; |
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|
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dvalue = array_ref(attr_arr, attr_ndims, indx, -1, attr_len, attr_byval, attr_align, &isnull); |
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|
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if (!isnull && doc) |
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values[j] = DatumGetCString( |
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attr2text(doc, |
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(char *)DirectFunctionCall1(textout, dvalue) |
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)); |
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else |
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values[j] = NULL; |
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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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/* delete estraier document object */ |
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est_doc_delete(doc); |
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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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if(!est_db_close(db, &ecode)){ |
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ereport(ERROR, (errcode(ERRCODE_IO_ERROR), |
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errmsg("est_db_close: %d", ecode), |
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errdetail(est_err_msg(ecode)))); |
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} |
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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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