blob: 4cca09dd255a319c5042ab532cbfafe28736e3e4 [file] [log] [blame]
#!/usr/bin/env python
#
# Copyright 2007 Google 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.
#
"""Helper functions to quit the development server."""
import logging
import os
import signal
import time
_shutting_down = False
_num_terminate_requests = 0
def async_quit():
"""Quits the development server asynchronously in an organized fashion.
Requests in progress may be dropped.
"""
global _shutting_down
_shutting_down = True
def _async_terminate(*_):
async_quit()
global _num_terminate_requests
_num_terminate_requests += 1
if _num_terminate_requests == 1:
logging.info('Shutting down.')
if _num_terminate_requests >= 3:
logging.error('Received third interrupt signal. Terminating.')
os.abort()
def wait_until_shutdown():
while not _shutting_down:
try:
time.sleep(1)
except IOError:
# On Windows time.sleep raises IOError when interrupted.
pass
def install_signal_handlers():
"""Installs a signal handler for SIGTERM and SIGINT to do orderly shutdown."""
signal.signal(signal.SIGTERM, _async_terminate)
signal.signal(signal.SIGINT, _async_terminate)