// Copyright 2023 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <Common/getFQDNOrHostName.h>
#include <Poco/Net/DNS.h>


namespace
{
std::string getFQDNOrHostNameImpl()
{
    try
    {
        return Poco::Net::DNS::thisHost().name();
    }
    catch (...)
    {
        return Poco::Net::DNS::hostName();
    }
}
} // namespace


const std::string & getFQDNOrHostName()
{
    static std::string result = getFQDNOrHostNameImpl();
    return result;
}