ansible/library/utilities/wait_for
2013-06-27 17:42:33 -07:00

142 lines
4.2 KiB
Python

#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2012, Jeroen Hoekx <jeroen@hoekx.be>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
import socket
import datetime
import time
import sys
DOCUMENTATION = '''
---
module: wait_for
short_description: Waits for a given port to become accessible on a server.
description:
- This is useful for when services are not immediately available after
their init scripts return - which is true of certain Java application
servers. It is also useful when starting guests with the M(virt) module and
needing to pause until they are ready.
version_added: "0.7"
options:
host:
description:
- hostname or IP address to wait for
required: false
default: "127.0.0.1"
aliases: []
timeout:
description:
- maximum number of seconds to wait for
required: false
default: 300
delay:
description:
- number of seconds to wait before starting to poll
required: false
default: 0
port:
description:
- port number to poll
required: true
state:
description:
- either C(started), or C(stopped) depending on whether the module should
poll for the port being open or closed.
choices: [ "started", "stopped" ]
default: "started"
notes: []
requirements: []
author: Jeroen Hoekx
'''
EXAMPLES = '''
# wait 300 seconds for port 8000 to become open on the host, don't start checking for 10 seconds
- wait_for: port=8000 delay=10"
'''
def main():
module = AnsibleModule(
argument_spec = dict(
host=dict(default='127.0.0.1'),
timeout=dict(default=300),
connect_timeout=dict(default=5),
delay=dict(default=0),
port=dict(required=True),
state=dict(default='started', choices=['started', 'stopped']),
),
)
params = module.params
host = params['host']
timeout = int(params['timeout'])
connect_timeout = int(params['connect_timeout'])
delay = int(params['delay'])
port = int(params['port'])
state = params['state']
start = datetime.datetime.now()
if delay:
time.sleep(delay)
if state == 'stopped':
### first wait for the host to go down
end = start + datetime.timedelta(seconds=timeout)
while datetime.datetime.now() < end:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(connect_timeout)
try:
s.connect( (host, port) )
s.shutdown(socket.SHUT_RDWR)
s.close()
time.sleep(1)
except:
break
else:
elapsed = datetime.datetime.now() - start
module.fail_json(msg="Timeout when waiting for %s:%s to stop." % (host, port), elapsed=elapsed.seconds)
elif state == 'started':
### wait for the host to come up
end = start + datetime.timedelta(seconds=timeout)
while datetime.datetime.now() < end:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(connect_timeout)
try:
s.connect( (host, port) )
s.shutdown(socket.SHUT_RDWR)
s.close()
break
except:
time.sleep(1)
pass
else:
elapsed = datetime.datetime.now() - start
module.fail_json(msg="Timeout when waiting for %s:%s" % (host, port), elapsed=elapsed.seconds)
elapsed = datetime.datetime.now() - start
module.exit_json(state=state, port=port, elapsed=elapsed.seconds)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()