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lua_sql.c
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lua_sql.c
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/*
* Copyright 2010-2017, Tarantool AUTHORS, please see AUTHORS file.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "lua.h"
#include "lua/utils.h"
#include "box/lua/call.h"
#include "box/sql/sqlInt.h"
#include "box/sql/vdbeInt.h"
struct lua_sql_func_info {
int func_ref;
};
/**
* This function is callback which is called by sql engine.
*
* Purpose of this function is to call lua func from sql.
* Lua func should be previously registered in sql
* (see lbox_sql_create_function).
*/
static void
lua_sql_call(sql_context *pCtx, int nVal, sql_value **apVal) {
lua_State *L = lua_newthread(tarantool_L);
int coro_ref = luaL_ref(tarantool_L, LUA_REGISTRYINDEX);
struct lua_sql_func_info *func_info = sql_user_data(pCtx);
lua_rawgeti(L, LUA_REGISTRYINDEX, func_info->func_ref);
for (int i = 0; i < nVal; i++) {
sql_value *param = apVal[i];
switch (sql_value_type(param)) {
case MP_INT:
luaL_pushint64(L, sql_value_int64(param));
break;
case MP_UINT:
luaL_pushuint64(L, sql_value_uint64(param));
break;
case MP_DOUBLE:
lua_pushnumber(L, sql_value_double(param));
break;
case MP_STR:
lua_pushstring(L, (const char *) sql_value_text(param));
break;
case MP_BIN:
lua_pushlstring(L, sql_value_blob(param),
(size_t) sql_value_bytes(param));
break;
case MP_NIL:
lua_rawgeti(L, LUA_REGISTRYINDEX, luaL_nil_ref);
break;
case MP_BOOL:
lua_pushboolean(L, sql_value_boolean(param));
break;
default:
diag_set(ClientError, ER_SQL_EXECUTE, "Unsupported "\
"type passed to Lua");
pCtx->is_aborted = true;
goto error;
}
}
if (lua_pcall(L, lua_gettop(L) - 1, 1, 0) != 0){
diag_set(ClientError, ER_SQL_EXECUTE, lua_tostring(L, -1));
pCtx->is_aborted = true;
goto error;
}
switch(lua_type(L, -1)) {
case LUA_TBOOLEAN:
sql_result_bool(pCtx, lua_toboolean(L, -1));
break;
case LUA_TNUMBER:
sql_result_double(pCtx, lua_tonumber(L, -1));
break;
case LUA_TSTRING:
sql_result_text(pCtx, lua_tostring(L, -1), -1,
SQL_TRANSIENT);
break;
case LUA_TNIL:
sql_result_null(pCtx);
break;
default:
diag_set(ClientError, ER_SQL_EXECUTE, "Unsupported type "\
"passed from Lua");
pCtx->is_aborted = true;
goto error;
}
error:
luaL_unref(tarantool_L, LUA_REGISTRYINDEX, coro_ref);
return;
}
static void
lua_sql_destroy(void *p)
{
struct lua_sql_func_info *func_info = p;
luaL_unref(tarantool_L, LUA_REGISTRYINDEX, func_info->func_ref);
free(func_info);
return;
}
/**
* A helper to register lua function in SQL during runtime.
* It makes available queries like this: "SELECT lua_func(arg);"
*
* sql_create_function *p argument is used to store func ref
* to lua function (it identifies actual lua func to call if there
* are many of them). SQL function must have name and type of
* returning value. Additionally, it can feature number of
* arguments and deterministic flag.
*/
int
lbox_sql_create_function(struct lua_State *L)
{
struct sql *db = sql_get();
if (db == NULL)
return luaL_error(L, "Please call box.cfg{} first");
int argc = lua_gettop(L);
/*
* Three function prototypes are possible:
* 1. sql_create_function("func_name", "type", func);
* 2. sql_create_function("func_name", "type", func,
* func_arg_num);
* 3. sql_create_function("func_name", "type", func,
* func_arg_num, is_deterministic);
*/
if (!(argc == 3 && lua_isstring(L, 1) && lua_isstring(L, 2) &&
lua_isfunction(L, 3)) &&
!(argc == 4 && lua_isstring(L, 1) && lua_isstring(L, 2) &&
lua_isfunction(L, 3) && lua_isnumber(L, 4)) &&
!(argc == 5 && lua_isstring(L, 1) && lua_isstring(L, 2) &&
lua_isfunction(L, 3) && lua_isnumber(L, 4) &&
lua_isboolean(L, 5)))
return luaL_error(L, "Invalid arguments");
enum field_type type;
const char *type_arg = lua_tostring(L, 2);
if (strcmp(type_arg, "INT") == 0 || strcmp(type_arg, "INTEGER") == 0)
type = FIELD_TYPE_INTEGER;
else if (strcmp(type_arg, "TEXT") == 0)
type = FIELD_TYPE_STRING;
else if (strcmp(type_arg, "FLOAT") == 0)
type = FIELD_TYPE_NUMBER;
else if (strcmp(type_arg, "NUM") == 0)
type = FIELD_TYPE_NUMBER;
else if (strcmp(type_arg, "BLOB") == 0)
type = FIELD_TYPE_SCALAR;
else if (strcmp(type_arg, "BOOL") == 0 ||
strcmp(type_arg, "BOOLEAN") == 0)
type = FIELD_TYPE_BOOLEAN;
else
return luaL_error(L, "Unknown type");
/* -1 indicates any number of arguments. */
int func_arg_num = -1;
bool is_deterministic = false;
if (argc == 4) {
func_arg_num = lua_tointeger(L, 4);
lua_pop(L, 1);
} else if (argc == 5) {
is_deterministic = lua_toboolean(L, 5);
func_arg_num = lua_tointeger(L, 4);
lua_pop(L, 2);
}
size_t name_len;
const char *name = lua_tolstring(L, 1, &name_len);
char *normalized_name =
sql_normalized_name_region_new(&fiber()->gc, name, name_len);
if (normalized_name == NULL)
return luaT_error(L);
struct lua_sql_func_info *func_info =
(struct lua_sql_func_info *) malloc(sizeof(*func_info));
if (func_info == NULL)
return luaL_error(L, "out of memory");
func_info->func_ref = luaL_ref(L, LUA_REGISTRYINDEX);
int rc = sql_create_function_v2(db, normalized_name, type, func_arg_num,
is_deterministic ? SQL_DETERMINISTIC : 0,
func_info, lua_sql_call, NULL, NULL,
lua_sql_destroy);
if (rc != 0)
return luaT_error(L);
return 0;
}