117 lines
4.1 KiB
C++
117 lines
4.1 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_current_user.h"
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#include "sql/engine/ob_physical_plan_ctx.h"
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#include "lib/mysqlclient/ob_mysql_result.h"
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#include "lib/mysqlclient/ob_mysql_transaction.h"
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#include "lib/string/ob_sql_string.h"
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#include "lib/mysqlclient/ob_mysql_proxy.h"
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#include "lib/oblog/ob_log_module.h"
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#include "sql/engine/ob_exec_context.h"
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using namespace oceanbase::common;
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using namespace oceanbase::sql;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprCurrentUser::ObExprCurrentUser(ObIAllocator &alloc)
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:ObStringExprOperator(alloc, T_FUN_SYS_CURRENT_USER, N_CURRENT_USER, 0, NOT_VALID_FOR_GENERATED_COL)
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{
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}
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ObExprCurrentUser::~ObExprCurrentUser()
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{
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}
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int ObExprCurrentUser::calc_result_type0(ObExprResType &type,
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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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type.set_varchar();
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type.set_default_collation_type();
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type.set_collation_level(CS_LEVEL_SYSCONST);
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type.set_length(static_cast<ObLength>((OB_MAX_HOST_NAME_LENGTH
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+ OB_MAX_USER_NAME_LENGTH + 1)));
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return ret;
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}
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int ObExprCurrentUser::eval_current_user(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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UNUSED(expr);
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const ObSQLSessionInfo *session_info = NULL;
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if (OB_ISNULL(session_info = ctx.exec_ctx_.get_my_session())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("session info is null", K(ret));
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} else {
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ObSchemaGetterGuard schema_guard;
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uint64_t tenant_id = session_info->get_effective_tenant_id();
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uint64_t priv_user_id = session_info->get_priv_user_id();
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const ObUserInfo *user_info = nullptr;
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if (OB_ISNULL(GCTX.schema_service_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected NULL GCTX.schema_service_", K(ret));
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} else if (OB_FAIL(GCTX.schema_service_->get_tenant_schema_guard(
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tenant_id, schema_guard))) {
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LOG_WARN("failed to get tenant schema guard", K(ret));
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} else if (OB_FAIL(schema_guard.get_user_info(tenant_id,
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priv_user_id,
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user_info))) {
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LOG_WARN("failed to get user info", K(ret), K(tenant_id), K(priv_user_id));
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} else if (OB_ISNULL(user_info)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected NULL user_info", K(ret), K(tenant_id), K(priv_user_id));
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} else {
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const ObString &user_name = user_info->get_user_name_str();
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const ObString &hostname = user_info->get_host_name_str();
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size_t buf_len = user_name.length() + hostname.length() + 2;
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size_t pos=0;
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char *buf = static_cast<char *>(
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ctx.get_expr_res_alloc().alloc(buf_len));
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if (OB_ISNULL(buf)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("failed to alloc memory for result buf", K(ret), K(user_info));
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} else if (OB_UNLIKELY(
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(pos = snprintf(buf, buf_len, "%.*s@%.*s",
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user_name.length(), user_name.ptr(),
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hostname.length(), hostname.ptr())) < 0)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("failed to snprintf", K(ret), K(user_info), K(buf_len));
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} else {
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expr_datum.set_string(buf, pos);
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}
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}
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}
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return ret;
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}
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int ObExprCurrentUser::cg_expr(ObExprCGCtx &op_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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UNUSED(raw_expr);
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UNUSED(op_cg_ctx);
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rt_expr.eval_func_ = ObExprCurrentUser::eval_current_user;
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return OB_SUCCESS;
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}
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}/* ns sql*/
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}/* ns oceanbase */
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