// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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 "udf/python/python_udf_runtime.h"

#include <butil/fd_utility.h>

#include <sys/wait.h>

#include <unistd.h>

#include <boost/process.hpp>

#include "common/logging.h"

namespace doris {

void PythonUDFProcess::remove_unix_socket() {

    if (_uri.empty() || _unix_socket_file_path.empty()) return;

    if (unlink(_unix_socket_file_path.c_str()) == 0) {

        LOG(INFO) << "Successfully removed unix socket: " << _unix_socket_file_path;

        return;

    }

    if (errno == ENOENT) {

        // File does not exist, this is fine, no need to warn

        LOG(INFO) << "Unix socket not found (already removed): " << _uri;

    } else {

        LOG(WARNING) << "Failed to remove unix socket " << _uri << ": " << std::strerror(errno)

                     << " (errno=" << errno << ")";

    }

}

void PythonUDFProcess::shutdown() {

    if (!_child.valid() || _is_shutdown) return;

    _child.terminate();

    bool graceful = false;

    constexpr std::chrono::milliseconds retry_interval(100); // 100ms

    for (int i = 0; i < TERMINATE_RETRY_TIMES; ++i) {

        if (!_child.running()) {

            graceful = true;

            break;

        }

        std::this_thread::sleep_for(retry_interval);

    }

    if (!graceful) {

        LOG(WARNING) << "Python process did not terminate gracefully, sending SIGKILL";

        ::kill(_child_pid, SIGKILL);

        _child.wait();

    }

    if (int exit_code = _child.exit_code(); exit_code > 128 && exit_code <= 255) {

        int signal = exit_code - 128;

        LOG(INFO) << "Python process was killed by signal " << signal;

    } else {

        LOG(INFO) << "Python process exited normally with code: " << exit_code;

    }

    _output_stream.close();

    remove_unix_socket();

    _is_shutdown = true;

}

std::string PythonUDFProcess::to_string() const {

    return fmt::format(

            "PythonUDFProcess(child_pid={}, uri={}, "

            "unix_socket_file_path={}, is_shutdown={})",

            _child_pid, _uri, _unix_socket_file_path, _is_shutdown);

}

} // namespace doris