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/* -*- c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
Copyright(C) 2017 Kouhei Sutou <kou@clear-code.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*/
#include <mrn_mysql.h>
#include <mrn_mysql_compat.h>
#include <mrn_path_mapper.hpp>
#include <mrn_windows.hpp>
#include <mrn_macro.hpp>
#include <mrn_variables.hpp>
#include <mrn_database_manager.hpp>
#include <mrn_context_pool.hpp>
#include <mrn_current_thread.hpp>
#include <mrn_query_parser.hpp>
MRN_BEGIN_DECLS
extern mrn::DatabaseManager *mrn_db_manager;
extern mrn::ContextPool *mrn_context_pool;
namespace mrn {
struct QueryExpandInfo {
grn_ctx *ctx;
grn_obj expanded_query;
grn_obj *term_column;
grn_obj *expanded_term_column;
};
}
static void mrn_query_expand_info_free(mrn::QueryExpandInfo *info)
{
MRN_DBUG_ENTER_FUNCTION();
if (!info) {
DBUG_VOID_RETURN;
}
if (info->ctx) {
GRN_OBJ_FIN(info->ctx, &(info->expanded_query));
if (grn_obj_is_accessor(info->ctx, info->expanded_term_column)) {
grn_obj_unlink(info->ctx, info->expanded_term_column);
}
if (grn_obj_is_accessor(info->ctx, info->term_column)) {
grn_obj_unlink(info->ctx, info->term_column);
}
mrn_context_pool->release(info->ctx);
}
my_free(info);
DBUG_VOID_RETURN;
}
MRN_API my_bool mroonga_query_expand_init(UDF_INIT *init,
UDF_ARGS *args,
char *message)
{
mrn::QueryExpandInfo *info = NULL;
MRN_DBUG_ENTER_FUNCTION();
init->ptr = NULL;
if (args->arg_count != 4) {
sprintf(message,
"mroonga_query_expand(): wrong number of arguments: %u for 4",
args->arg_count);
goto error;
}
if (args->arg_type[0] != STRING_RESULT) {
strcpy(message,
"mroonga_query_expand(): "
"the 1st argument must be table name as string");
goto error;
}
if (args->arg_type[1] != STRING_RESULT) {
strcpy(message,
"mroonga_query_expand(): "
"the 2nd argument must be term column name as string");
goto error;
}
if (args->arg_type[2] != STRING_RESULT) {
strcpy(message,
"mroonga_query_expand(): "
"the 3nd argument must be expanded term column name as string");
goto error;
}
if (args->arg_type[3] != STRING_RESULT) {
strcpy(message,
"mroonga_query_expand(): "
"the 4th argument must be query as string");
goto error;
}
init->maybe_null = 1;
info = static_cast<mrn::QueryExpandInfo *>(
mrn_my_malloc(sizeof(mrn::QueryExpandInfo),
MYF(MY_WME | MY_ZEROFILL)));
if (!info) {
snprintf(message, MYSQL_ERRMSG_SIZE,
"mroonga_query_expand(): failed to allocate memory");
goto error;
}
{
const char *current_db_path = MRN_THD_DB_PATH(current_thd);
if (!current_db_path) {
snprintf(message, MYSQL_ERRMSG_SIZE,
"mroonga_query_expand(): no current database");
goto error;
}
mrn::Database *db;
int error = mrn_db_manager->open(current_db_path, &db);
if (error != 0) {
snprintf(message, MYSQL_ERRMSG_SIZE,
"mroonga_query_expand(): failed to open database: %s",
mrn_db_manager->error_message());
goto error;
}
info->ctx = mrn_context_pool->pull();
grn_ctx_use(info->ctx, db->get());
}
GRN_TEXT_INIT(&(info->expanded_query), 0);
{
const char *table_name = args->args[0];
unsigned int table_name_length = args->lengths[0];
grn_obj *table = grn_ctx_get(info->ctx,
table_name,
table_name_length);
if (!table) {
snprintf(message, MYSQL_ERRMSG_SIZE,
"mroonga_query_expand(): table doesn't exist: <%.*s>",
static_cast<int>(table_name_length),
table_name);
goto error;
}
const char *term_column_name = args->args[1];
unsigned int term_column_name_length = args->lengths[1];
info->term_column = grn_obj_column(info->ctx,
table,
term_column_name,
term_column_name_length);
if (!info->term_column) {
snprintf(message, MYSQL_ERRMSG_SIZE,
"mroonga_query_expand(): term column doesn't exist: <%.*s.%.*s>",
static_cast<int>(table_name_length),
table_name,
static_cast<int>(term_column_name_length),
term_column_name);
goto error;
}
const char *expanded_term_column_name = args->args[2];
unsigned int expanded_term_column_name_length = args->lengths[2];
info->expanded_term_column = grn_obj_column(info->ctx,
table,
expanded_term_column_name,
expanded_term_column_name_length);
if (!info->expanded_term_column) {
snprintf(message, MYSQL_ERRMSG_SIZE,
"mroonga_query_expand(): "
"expanded term column doesn't exist: <%.*s.%.*s>",
static_cast<int>(table_name_length),
table_name,
static_cast<int>(expanded_term_column_name_length),
expanded_term_column_name);
goto error;
}
}
init->ptr = reinterpret_cast<char *>(info);
DBUG_RETURN(FALSE);
error:
mrn_query_expand_info_free(info);
DBUG_RETURN(TRUE);
}
static void query_expand(mrn::QueryExpandInfo *info, UDF_ARGS *args)
{
grn_ctx *ctx = info->ctx;
const char *query = args->args[3];
unsigned int query_length = args->lengths[3];
mrn::QueryParser query_parser(info->ctx,
current_thd,
NULL,
NULL,
0,
NULL);
const char *raw_query;
size_t raw_query_length;
grn_operator default_operator;
grn_expr_flags flags;
query_parser.parse_pragma(query,
query_length,
&raw_query,
&raw_query_length,
&default_operator,
&flags);
GRN_TEXT_SET(info->ctx,
&(info->expanded_query),
query,
raw_query - query);
grn_expr_syntax_expand_query_by_table(ctx,
raw_query,
raw_query_length,
flags,
info->term_column,
info->expanded_term_column,
&(info->expanded_query));
}
MRN_API char *mroonga_query_expand(UDF_INIT *init,
UDF_ARGS *args,
char *result,
unsigned long *length,
char *is_null,
char *error)
{
MRN_DBUG_ENTER_FUNCTION();
mrn::QueryExpandInfo *info =
reinterpret_cast<mrn::QueryExpandInfo *>(init->ptr);
grn_ctx *ctx = info->ctx;
if (!args->args[3]) {
*is_null = 1;
DBUG_RETURN(NULL);
}
*is_null = 0;
query_expand(info, args);
if (ctx->rc) {
char message[MYSQL_ERRMSG_SIZE];
snprintf(message, MYSQL_ERRMSG_SIZE,
"mroonga_query_expand(): "
"failed to expand: %s",
ctx->errbuf);
my_message(ER_ERROR_ON_WRITE, message, MYF(0));
goto error;
}
*length = GRN_TEXT_LEN(&(info->expanded_query));
DBUG_RETURN(GRN_TEXT_VALUE(&(info->expanded_query)));
error:
*error = 1;
DBUG_RETURN(NULL);
}
MRN_API void mroonga_query_expand_deinit(UDF_INIT *init)
{
MRN_DBUG_ENTER_FUNCTION();
mrn::QueryExpandInfo *info =
reinterpret_cast<mrn::QueryExpandInfo *>(init->ptr);
mrn_query_expand_info_free(info);
DBUG_VOID_RETURN;
}
MRN_END_DECLS
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