138 lines
4.2 KiB
C++
138 lines
4.2 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#define USING_LOG_PREFIX SQL_ENG
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#include "sql/engine/expr/ob_expr_random_bytes.h"
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#include <openssl/rand.h>
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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ObExprRandomBytes::ObExprRandomBytes(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_RANDOM_BYTES, N_RANDOM_BYTES, 1, NOT_ROW_DIMENSION)
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{
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}
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ObExprRandomBytes::~ObExprRandomBytes()
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{
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}
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int ObExprRandomBytes::calc_result_type1(ObExprResType &type,
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ObExprResType &len,
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ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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UNUSED(type_ctx);
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len.set_calc_type(ObInt32Type);
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static const int64_t MAX_RAND_BYTES = 1024;
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type.set_varbinary();
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type.set_collation_type(CS_TYPE_BINARY);
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type.set_collation_level(CS_LEVEL_COERCIBLE);
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type.set_length(MAX_RAND_BYTES);
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return ret;
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}
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int ObExprRandomBytes::calc_result1(ObObj &result, const ObObj &len,
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ObExprCtx &expr_ctx) const
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{
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int ret = OB_SUCCESS;
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if (len.is_null()) {
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result.set_null();
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} else if (len.is_int32()) {
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ObString::obstr_size_t length = len.get_int32();
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if (length >= 1 && length <= 1024) {
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char *buf = (char *)expr_ctx.calc_buf_->alloc(length);
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if (OB_ISNULL(buf)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("allocate memory failed", K(ret), K(length));
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} else {
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RAND_bytes((unsigned char*)buf, length);
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ObString rand_str(length, length, buf);
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result.set_binary(rand_str);
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}
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} else {
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ret = OB_ERR_ARGUMENT_OUT_OF_RANGE;
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LOG_WARN("length value is out of range in random_bytes",
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K(ret), K(length));
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}
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} else {
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ret = OB_OBJ_TYPE_ERROR;
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LOG_WARN("invalid argument type for random_bytes",
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K(ret));
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}
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return ret;
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}
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int ObExprRandomBytes::generate_random_bytes(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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if (ObInt32Type == expr.args_[0]->datum_meta_.type_) {
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ObDatum *num_datum = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, num_datum))) {
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LOG_WARN("eval param value failed", K(ret));
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} else if (num_datum->is_null()) {
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expr_datum.set_null();
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} else {
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ObString::obstr_size_t length = num_datum->get_int32();
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if (length >= 1 && length <= 1024) {
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char *buf = (char *)expr.get_str_res_mem(ctx, length);
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if (OB_ISNULL(buf)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("allocate memory failed", K(ret), K(length));
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} else {
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RAND_bytes((unsigned char*)buf, length);
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ObString rand_str(length, length, buf);
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expr_datum.set_string(rand_str);
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}
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} else {
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ret = OB_ERR_ARGUMENT_OUT_OF_RANGE;
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LOG_WARN("length value is out of range in random_bytes",
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K(ret), K(length));
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}
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}
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} else {
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ret = OB_OBJ_TYPE_ERROR;
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LOG_WARN("invalid argument type for random_bytes",
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K(ret));
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}
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return ret;
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}
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int ObExprRandomBytes::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(expr_cg_ctx);
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UNUSED(raw_expr);
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if (rt_expr.arg_cnt_ != 1) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("Incorrect parameter count in the call to native function random_bytes",
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K(ret), K(rt_expr.arg_cnt_));
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} else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0])) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("children of random_bytes expr is null", K(ret), K(rt_expr.args_));
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} else {
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rt_expr.eval_func_ = ObExprRandomBytes::generate_random_bytes;
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}
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return ret;
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}
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} // sql
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} // oceanbase
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