# 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.
from __future__ import annotations

import os

import structlog

from airflow.sdk.exceptions import AirflowTaskTimeout


class TimeoutPosix:
    """POSIX Timeout version: To be used in a ``with`` block and timeout its content."""

    def __init__(self, seconds=1, error_message="Timeout"):
        super().__init__()
        self.seconds = seconds
        self.error_message = error_message + ", PID: " + str(os.getpid())
        self.log = structlog.get_logger(logger_name="task")
        self._timeout_supported = False

    def handle_timeout(self, signum, frame):
        """Log information and raises AirflowTaskTimeout."""
        self.log.error("Process timed out", pid=os.getpid())
        raise AirflowTaskTimeout(self.error_message)

    def __enter__(self):
        import signal

        try:
            signal.signal(signal.SIGALRM, self.handle_timeout)
            signal.setitimer(signal.ITIMER_REAL, self.seconds)
            self._timeout_supported = True
        except (AttributeError, ValueError):
            self.log.warning(
                "TimeoutPosix requires signal.SIGALRM and the main thread. Proceeding without a timeout."
            )
        return self

    def __exit__(self, type_, value, traceback):
        if not self._timeout_supported:
            return
        import signal

        signal.setitimer(signal.ITIMER_REAL, 0)


timeout = TimeoutPosix
