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/*
* Copyright (C) 2004-2010 Christos Tsantilas
*
* This program 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 program 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 02110-1301 USA.
*/
#include "common.h"
#include "lookup_table.h"
#include "debug.h"
#include "mem.h"
/***********************************************************/
/* Global variables */
/*we can support up to 128 lookup table types, looks enough*/
const struct ci_lookup_table_type *lookup_tables_types[128];
int lookup_tables_types_num = 0;
/*********************************************************************/
/*Lookuptable library functions */
struct ci_lookup_table_type *ci_lookup_table_type_register( struct ci_lookup_table_type *lt_type)
{
if (lookup_tables_types_num >= 128) {
ci_debug_printf(1,"c-icap does not support more than 128 loookup table types");
return NULL;
}
lookup_tables_types[lookup_tables_types_num++] = lt_type;
return lt_type;
}
void ci_lookup_table_type_unregister( struct ci_lookup_table_type *lt_type)
{
int i;
for (i = 0; lookup_tables_types[i] != lt_type && i < lookup_tables_types_num; i++);
if (i<lookup_tables_types_num) {
lookup_tables_types_num--;
for (; i < lookup_tables_types_num; i++)
lookup_tables_types[i] = lookup_tables_types[i+1];
}
}
const struct ci_lookup_table_type *ci_lookup_table_type_search(const char *type)
{
int i;
for (i = 0; i<lookup_tables_types_num; i++) {
if (strcmp(type,lookup_tables_types[i]->type) == 0)
return lookup_tables_types[i];
}
return NULL;
}
static const void * lookup_table_get_row(struct ci_lookup_table *table, const void *key, const char *columns[], void ***vals);
struct ci_lookup_table *ci_lookup_table_create_ext(const char *table,
const ci_type_ops_t *key_ops,
const ci_type_ops_t *val_ops,
ci_mem_allocator_t *allocator)
{
char *ttype,*path,*args,*s;
const struct ci_lookup_table_type *lt_type;
struct ci_lookup_table *lt;
char *stable = strdup(table);
if (!stable) {
/*A debug message.....*/
return NULL;
}
/*Normaly the table has the form tabletype:/path/{args}*/
s = index(stable,':');
if (!s) { /*Then it is a simple text file*/
ttype = "file";
path = stable;
args = NULL;
} else {
ttype = stable;
path = s+1;
*s = '\0';
s = index(path,'{');
if (s) {
*s = '\0'; /* path ends here */
args = s+1; /*args start here */
if ((s = index(args,'}'))) *s = '\0'; /*else args is all the remains string */
} else /*No args*/
args = NULL;
}
lt_type = ci_lookup_table_type_search(ttype);
if (!lt_type || !lt_type->open) {
ci_debug_printf(1,"Not lookuptable of type :%s!!!\n", ttype);
free(stable);
return NULL;
}
lt = malloc(sizeof(struct ci_lookup_table));
if (!lt) {
ci_debug_printf(1,"memory allocation error!!");
free(stable);
return NULL;
}
lt->path = strdup(path);
if (args)
lt->args = strdup(args);
else
lt->args = NULL;
free(stable);
lt->cols = -1;
lt->key_ops = key_ops;
lt->val_ops = val_ops;
lt->type = lt_type->type;
lt->open = lt_type->open;
lt->close = lt_type->close;
lt->search = lt_type->search;
lt->get_row = lookup_table_get_row;
lt->release_result = lt_type->release_result;
lt->allocator = allocator;
lt->_lt_type = lt_type;
lt->data = NULL;
return lt;
}
struct ci_lookup_table *ci_lookup_table_create(const char *table)
{
ci_mem_allocator_t *allocator;
struct ci_lookup_table *lt;
allocator = ci_create_os_allocator();
if (!allocator)
return NULL;
lt = ci_lookup_table_create_ext(table, &ci_str_ops, &ci_str_ops, allocator);
if (!lt)
ci_mem_allocator_destroy(allocator);
return lt;
}
void ci_lookup_table_destroy(struct ci_lookup_table *lt)
{
if (!lt)
return;
lt->close(lt);
free(lt->path);
if (lt->args)
free(lt->args);
if (lt->allocator)
ci_mem_allocator_destroy(lt->allocator);
free(lt);
}
void * ci_lookup_table_open(struct ci_lookup_table *table)
{
if (!table->_lt_type || !table->open) {
ci_debug_printf(1, "lookup_table of type %s is corrupted (\"open\" method missing)!\n", table->type);
return NULL;
}
return table->open(table);
}
const char * ci_lookup_table_search(struct ci_lookup_table *table, const char *key, char ***vals)
{
if (!table->_lt_type || !table->search) {
ci_debug_printf(1, "lookup_table of type %s is corrupted (\"search\" method missing)!\n", table->type);
return NULL;
}
if (!ci_type_ops_is_string(table->key_ops) || !ci_type_ops_is_string(table->val_ops)) {
ci_debug_printf(1, "lookup_table of type %s does not support search with string like keys!\n", table->type);
return NULL;
}
return table->search(table, (void *)key, (void ***)vals);
}
void ci_lookup_table_release_result(struct ci_lookup_table *table, void **val)
{
if (!table->_lt_type || !table->release_result) {
ci_debug_printf(1, "lookup_table of type %s is corrupted (\"release_result\" method missing)!\n", table->type);
return;
}
return table->release_result(table, (void **)val);
}
const void * lookup_table_get_row(struct ci_lookup_table *table, const void *key, const char *columns[], void ***vals)
{
int i;
if (!table->_lt_type) {
ci_debug_printf(1, "lookup_table of type %s is corrupted!\n", table->type);
return NULL;
}
if (!table->col_names || !table->_lt_type->get_row) {
ci_debug_printf(1, "lookup_table :%s does not support lookup on named columns\n", table->type);
return NULL;
}
for (i = 0; i < 1024 && columns[i] != NULL; i++) {
if (NULL == ci_str_vector_search(table->col_names, columns[i])) {
ci_debug_printf(1, "lookup_table :%s does not has column %s\n", table->type, columns[i]);
return NULL;
}
}
return table->_lt_type->get_row(table, key, columns, vals);
}
const char * ci_lookup_table_get_row(struct ci_lookup_table *table, const char *key, const char *columns[], char ***vals)
{
if ( !ci_type_ops_is_string(table->key_ops) || !ci_type_ops_is_string(table->val_ops)) {
ci_debug_printf(1, "lookup_table of type %s does not support search with string like keys!\n", table->type);
return NULL;
}
return (const char *) lookup_table_get_row(table, (const void *)key, columns, (void ***)vals);
}
extern struct ci_lookup_table_type file_table_type;
extern struct ci_lookup_table_type hash_table_type;
extern struct ci_lookup_table_type regex_table_type;
CI_DECLARE_FUNC(void) init_internal_lookup_tables()
{
ci_lookup_table_type_register(&file_table_type);
ci_lookup_table_type_register(&hash_table_type);
ci_lookup_table_type_register(®ex_table_type);
}
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