daemontools module
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Brian Coca
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265
system/svc.py
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265
system/svc.py
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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DOCUMENTATION = '''
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---
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module: svc
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author: Brian Coca
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version_added:
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short_description: Manage daemontools services.
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description:
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- Controls daemontools services on remote hosts using the svc utility.
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options:
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name:
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required: true
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description:
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- Name of the service to manage.
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state:
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required: false
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choices: [ started, stopped, restarted, reloaded, once ]
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description:
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- C(Started)/C(stopped) are idempotent actions that will not run
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commands unless necessary. C(restarted) will always bounce the
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svc (svc -t). C(reloaded) will send a sigusr1 (svc -u).
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C(once) will run a normally downed svc once (svc -o), not really
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an idempotent operation.
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downed:
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required: false
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choices: [ "yes", "no" ]
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default: no
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description:
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- Should a 'down' file exist or not, if it exists it disables auto startup.
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defaults to no. Downed does not imply stopped.
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enabled:
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required: false
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choices: [ "yes", "no" ]
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description:
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- Wheater the service is enabled or not, if disabled it also implies stopped.
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Make note that a service can be enabled and downed (no auto restart).
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service_dir:
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required: false
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default: /service
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description:
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- directory svscan watches for services
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service_src:
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required: false
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description:
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- directory where services are defined, the source of symlinks to service_dir.
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'''
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EXAMPLES = '''
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# Example action to start svc dnscache, if not running
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- svc: name=dnscache state=started
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# Example action to stop svc dnscache, if running
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- svc: name=dnscache state=stopped
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# Example action to restart svc dnscache, in all cases
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- svc : name=dnscache state=restarted
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# Example action to reload svc dnscache, in all cases
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- svc: name=dnscache state=reloaded
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# Example using alt svc directory location
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- svc: name=dnscache state=reloaded service_dir=/var/service
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'''
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import platform
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import shlex
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def _load_dist_subclass(cls, *args, **kwargs):
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'''
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Used for derivative implementations
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'''
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subclass = None
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distro = kwargs['module'].params['distro']
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# get the most specific superclass for this platform
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if distro is not None:
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for sc in cls.__subclasses__():
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if sc.distro is not None and sc.distro == distro:
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subclass = sc
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if subclass is None:
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subclass = cls
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return super(cls, subclass).__new__(subclass)
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class Svc(object):
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"""
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Main class that handles daemontools, can be subclassed and overriden in case
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we want to use a 'derivative' like encore, s6, etc
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"""
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#def __new__(cls, *args, **kwargs):
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# return _load_dist_subclass(cls, args, kwargs)
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def __init__(self, module):
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self.extra_paths = [ '/command', '/usr/local/bin' ]
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self.report_vars = ['state', 'enabled', 'downed', 'svc_full', 'src_full', 'pid', 'duration', 'full_state']
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self.module = module
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self.name = module.params['name']
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self.service_dir = module.params['service_dir']
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self.service_src = module.params['service_src']
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self.enabled = None
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self.downed = None
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self.full_state = None
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self.state = None
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self.pid = None
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self.duration = None
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self.svc_cmd = module.get_bin_path('svc', opt_dirs=self.extra_paths)
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self.svstat_cmd = module.get_bin_path('svstat', opt_dirs=self.extra_paths)
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self.svc_full = '/'.join([ self.service_dir, self.name ])
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self.src_full = '/'.join([ self.service_src, self.name ])
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self.enabled = os.path.lexists(self.svc_full)
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if self.enabled:
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self.downed = os.path.lexists('%s/down' % self.svc_full)
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self.get_status()
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else:
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self.downed = os.path.lexists('%s/down' % self.src_full)
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self.state = 'stopped'
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def enable(self):
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if os.path.exists(self.src_full):
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try:
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os.symlink(self.src_full, self.svc_full)
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except OSError, e:
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self.module.fail_json(path=self.src_full, msg='Error while linking: %s' % str(e))
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else:
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self.module.fail_json(msg="Could not find source for service to enable (%s)." % self.src_full)
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def disable(self):
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try:
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os.unlink(self.svc_full)
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except OSError, e:
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self.module.fail_json(path=self.svc_full, msg='Error while unlinking: %s' % str(e))
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self.execute_command([self.svc_cmd,'-dx',self.src_full])
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src_log = '%s/log' % self.src_full
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if os.path.exists(src_log):
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self.execute_command([self.svc_cmd,'-dx',src_log])
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def get_status(self):
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(rc, out, err) = self.execute_command([self.svstat_cmd, self.svc_full])
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if err is not None and err:
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self.full_state = self.state = err
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else:
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self.full_state = out
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m = re.search('\(pid (\d+)\)', out)
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if m:
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self.pid = m.group(1)
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m = re.search('(\d+) seconds', out)
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if m:
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self.duration = m.group(1)
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if re.search(' up ', out):
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self.state = 'start'
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elif re.search(' down ', out):
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self.state = 'stopp'
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else:
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self.state = 'unknown'
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return
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if re.search(' want ', out):
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self.state += 'ing'
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else:
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self.state += 'ed'
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def start(self):
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return self.execute_command([self.svc_cmd, '-u', self.svc_full])
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def stopp(self):
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return self.stop()
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def stop(self):
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return self.execute_command([self.svc_cmd, '-d', self.svc_full])
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def once(self):
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return self.execute_command([self.svc_cmd, '-o', self.svc_full])
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def reload(self):
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return self.execute_command([self.svc_cmd, '-1', self.svc_full])
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def execute_command(self, cmd):
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try:
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(rc, out, err) = self.module.run_command(' '.join(cmd))
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except Exception, e:
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self.module.fail_json(msg="failed to execute: %s" % str(e))
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return (rc, out, err)
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def report(self):
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self.get_status()
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return {k: self.__dict__[k] for k in self.report_vars}
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# ===========================================
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# Main control flow
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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name = dict(required=True),
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state = dict(choices=['started', 'stopped', 'restarted', 'reloaded', 'once']),
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enabled = dict(required=False, type='bool', choices=BOOLEANS),
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downed = dict(required=False, type='bool', choices=BOOLEANS),
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dist = dict(required=False, default='daemontools'),
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service_dir = dict(required=False, default='/service'),
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service_src = dict(required=False, default='/etc/service'),
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),
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supports_check_mode=True,
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)
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state = module.params['state']
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enabled = module.params['enabled']
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downed = module.params['downed']
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svc = Svc(module)
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changed = False
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orig_state = svc.report()
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if enabled is not None and enabled != svc.enabled:
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changed = True
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if not module.check_mode:
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try:
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if enabled:
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svc.enable()
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else:
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svc.disable()
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except (OSError, IOError) as e:
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module.fail_json(msg="Could change service link: %s" % str(e))
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if state is not None and state != svc.state:
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changed = True
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if not module.check_mode:
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getattr(svc,state[:-2])()
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if downed is not None and downed != svc.downed:
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changed = True
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if not module.check_mode:
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d_file = "%s/down" % svc.svc_full
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try:
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if downed:
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open(d_file, "a").close()
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else:
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os.unlink(d_file)
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except (OSError, IOError) as e:
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module.fail_json(msg="Could change downed file: %s " % (str(e)))
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module.exit_json(changed=changed, svc=svc.report())
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# this is magic, not normal python include
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from ansible.module_utils.basic import *
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main()
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