#!/usr/bin/python # -*- coding: utf-8 -*- # (c) 2013, Darryl Stoflet # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt) from __future__ import absolute_import, division, print_function __metaclass__ = type ANSIBLE_METADATA = {'metadata_version': '1.1', 'status': ['preview'], 'supported_by': 'community'} DOCUMENTATION = ''' --- module: monit short_description: Manage the state of a program monitored via Monit description: - Manage the state of a program monitored via I(Monit) version_added: "1.2" options: name: description: - The name of the I(monit) program/process to manage required: true state: description: - The state of service required: true choices: [ "present", "started", "stopped", "restarted", "monitored", "unmonitored", "reloaded" ] timeout: description: - If there are pending actions for the service monitored by monit, then Ansible will check for up to this many seconds to verify the requested action has been performed. Ansible will sleep for five seconds between each check. default: 300 version_added: "2.1" author: "Darryl Stoflet (@dstoflet)" ''' EXAMPLES = ''' # Manage the state of program "httpd" to be in "started" state. - monit: name: httpd state: started ''' import time import re from ansible.module_utils.basic import AnsibleModule def main(): arg_spec = dict( name=dict(required=True), timeout=dict(default=300, type='int'), state=dict(required=True, choices=['present', 'started', 'restarted', 'stopped', 'monitored', 'unmonitored', 'reloaded']) ) module = AnsibleModule(argument_spec=arg_spec, supports_check_mode=True) name = module.params['name'] state = module.params['state'] timeout = module.params['timeout'] MONIT = module.get_bin_path('monit', True) def monit_version(): rc, out, err = module.run_command('%s -V' % MONIT, check_rc=True) version_line = out.split('\n')[0] version = re.search(r"[0-9]+\.[0-9]+", version_line).group().split('.') # Use only major and minor even if there are more these should be enough return int(version[0]), int(version[1]) def is_version_higher_than_5_18(): return (MONIT_MAJOR_VERSION, MONIT_MINOR_VERSION) > (5, 18) def parse(parts): if is_version_higher_than_5_18(): return parse_current(parts) else: return parse_older_versions(parts) def parse_older_versions(parts): if len(parts) > 2 and parts[0].lower() == 'process' and parts[1] == "'%s'" % name: return ' '.join(parts[2:]).lower() else: return '' def parse_current(parts): if len(parts) > 2 and parts[2].lower() == 'process' and parts[0] == name: return ''.join(parts[1]).lower() else: return '' def get_status(): """Return the status of the process in monit, or the empty string if not present.""" rc, out, err = module.run_command('%s %s' % (MONIT, SUMMARY_COMMAND), check_rc=True) for line in out.split('\n'): # Sample output lines: # Process 'name' Running # Process 'name' Running - restart pending parts = parse(line.split()) if parts != '': return parts return '' def run_command(command): """Runs a monit command, and returns the new status.""" module.run_command('%s %s %s' % (MONIT, command, name), check_rc=True) return get_status() def wait_for_monit_to_stop_pending(): """Fails this run if there is no status or it's pending/initializing for timeout""" timeout_time = time.time() + timeout sleep_time = 5 running_status = get_status() while running_status == '' or 'pending' in running_status or 'initializing' in running_status: if time.time() >= timeout_time: module.fail_json( msg='waited too long for "pending", or "initiating" status to go away ({0})'.format( running_status ), state=state ) time.sleep(sleep_time) running_status = get_status() MONIT_MAJOR_VERSION, MONIT_MINOR_VERSION = monit_version() SUMMARY_COMMAND = ('summary', 'summary -B')[is_version_higher_than_5_18()] if state == 'reloaded': if module.check_mode: module.exit_json(changed=True) rc, out, err = module.run_command('%s reload' % MONIT) if rc != 0: module.fail_json(msg='monit reload failed', stdout=out, stderr=err) wait_for_monit_to_stop_pending() module.exit_json(changed=True, name=name, state=state) present = get_status() != '' if not present and not state == 'present': module.fail_json(msg='%s process not presently configured with monit' % name, name=name, state=state) if state == 'present': if not present: if module.check_mode: module.exit_json(changed=True) status = run_command('reload') if status == '': wait_for_monit_to_stop_pending() module.exit_json(changed=True, name=name, state=state) module.exit_json(changed=False, name=name, state=state) wait_for_monit_to_stop_pending() running = 'running' in get_status() if running and state in ['started', 'monitored']: module.exit_json(changed=False, name=name, state=state) if running and state == 'stopped': if module.check_mode: module.exit_json(changed=True) status = run_command('stop') if status in ['not monitored'] or 'stop pending' in status: module.exit_json(changed=True, name=name, state=state) module.fail_json(msg='%s process not stopped' % name, status=status) if running and state == 'unmonitored': if module.check_mode: module.exit_json(changed=True) status = run_command('unmonitor') if status in ['not monitored'] or 'unmonitor pending' in status: module.exit_json(changed=True, name=name, state=state) module.fail_json(msg='%s process not unmonitored' % name, status=status) elif state == 'restarted': if module.check_mode: module.exit_json(changed=True) status = run_command('restart') if status in ['initializing', 'running'] or 'restart pending' in status: module.exit_json(changed=True, name=name, state=state) module.fail_json(msg='%s process not restarted' % name, status=status) elif not running and state == 'started': if module.check_mode: module.exit_json(changed=True) status = run_command('start') if status in ['initializing', 'running'] or 'start pending' in status: module.exit_json(changed=True, name=name, state=state) module.fail_json(msg='%s process not started' % name, status=status) elif not running and state == 'monitored': if module.check_mode: module.exit_json(changed=True) status = run_command('monitor') if status not in ['not monitored']: module.exit_json(changed=True, name=name, state=state) module.fail_json(msg='%s process not monitored' % name, status=status) module.exit_json(changed=False, name=name, state=state) if __name__ == '__main__': main()