From 3f78475cae9bb2d288d1d9150e106070b6fbcd2e Mon Sep 17 00:00:00 2001 From: Brian Coca Date: Wed, 11 Feb 2015 12:35:43 -0500 Subject: [PATCH] daemontools module --- system/svc.py | 265 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 265 insertions(+) create mode 100644 system/svc.py diff --git a/system/svc.py b/system/svc.py new file mode 100644 index 00000000000..841d6e78c90 --- /dev/null +++ b/system/svc.py @@ -0,0 +1,265 @@ +#!/usr/bin/python +# -*- coding: utf-8 -*- + +DOCUMENTATION = ''' +--- +module: svc +author: Brian Coca +version_added: +short_description: Manage daemontools services. +description: + - Controls daemontools services on remote hosts using the svc utility. +options: + name: + required: true + description: + - Name of the service to manage. + state: + required: false + choices: [ started, stopped, restarted, reloaded, once ] + description: + - C(Started)/C(stopped) are idempotent actions that will not run + commands unless necessary. C(restarted) will always bounce the + svc (svc -t). C(reloaded) will send a sigusr1 (svc -u). + C(once) will run a normally downed svc once (svc -o), not really + an idempotent operation. + downed: + required: false + choices: [ "yes", "no" ] + default: no + description: + - Should a 'down' file exist or not, if it exists it disables auto startup. + defaults to no. Downed does not imply stopped. + enabled: + required: false + choices: [ "yes", "no" ] + description: + - Wheater the service is enabled or not, if disabled it also implies stopped. + Make note that a service can be enabled and downed (no auto restart). + service_dir: + required: false + default: /service + description: + - directory svscan watches for services + service_src: + required: false + description: + - directory where services are defined, the source of symlinks to service_dir. +''' + +EXAMPLES = ''' +# Example action to start svc dnscache, if not running + - svc: name=dnscache state=started + +# Example action to stop svc dnscache, if running + - svc: name=dnscache state=stopped + +# Example action to restart svc dnscache, in all cases + - svc : name=dnscache state=restarted + +# Example action to reload svc dnscache, in all cases + - svc: name=dnscache state=reloaded + +# Example using alt svc directory location + - svc: name=dnscache state=reloaded service_dir=/var/service +''' + +import platform +import shlex + +def _load_dist_subclass(cls, *args, **kwargs): + ''' + Used for derivative implementations + ''' + subclass = None + + distro = kwargs['module'].params['distro'] + + # get the most specific superclass for this platform + if distro is not None: + for sc in cls.__subclasses__(): + if sc.distro is not None and sc.distro == distro: + subclass = sc + if subclass is None: + subclass = cls + + return super(cls, subclass).__new__(subclass) + +class Svc(object): + """ + Main class that handles daemontools, can be subclassed and overriden in case + we want to use a 'derivative' like encore, s6, etc + """ + + + #def __new__(cls, *args, **kwargs): + # return _load_dist_subclass(cls, args, kwargs) + + + + def __init__(self, module): + self.extra_paths = [ '/command', '/usr/local/bin' ] + self.report_vars = ['state', 'enabled', 'downed', 'svc_full', 'src_full', 'pid', 'duration', 'full_state'] + + self.module = module + + self.name = module.params['name'] + self.service_dir = module.params['service_dir'] + self.service_src = module.params['service_src'] + self.enabled = None + self.downed = None + self.full_state = None + self.state = None + self.pid = None + self.duration = None + + self.svc_cmd = module.get_bin_path('svc', opt_dirs=self.extra_paths) + self.svstat_cmd = module.get_bin_path('svstat', opt_dirs=self.extra_paths) + self.svc_full = '/'.join([ self.service_dir, self.name ]) + self.src_full = '/'.join([ self.service_src, self.name ]) + + self.enabled = os.path.lexists(self.svc_full) + if self.enabled: + self.downed = os.path.lexists('%s/down' % self.svc_full) + self.get_status() + else: + self.downed = os.path.lexists('%s/down' % self.src_full) + self.state = 'stopped' + + + def enable(self): + if os.path.exists(self.src_full): + try: + os.symlink(self.src_full, self.svc_full) + except OSError, e: + self.module.fail_json(path=self.src_full, msg='Error while linking: %s' % str(e)) + else: + self.module.fail_json(msg="Could not find source for service to enable (%s)." % self.src_full) + + def disable(self): + try: + os.unlink(self.svc_full) + except OSError, e: + self.module.fail_json(path=self.svc_full, msg='Error while unlinking: %s' % str(e)) + self.execute_command([self.svc_cmd,'-dx',self.src_full]) + + src_log = '%s/log' % self.src_full + if os.path.exists(src_log): + self.execute_command([self.svc_cmd,'-dx',src_log]) + + def get_status(self): + (rc, out, err) = self.execute_command([self.svstat_cmd, self.svc_full]) + + if err is not None and err: + self.full_state = self.state = err + else: + self.full_state = out + + m = re.search('\(pid (\d+)\)', out) + if m: + self.pid = m.group(1) + + m = re.search('(\d+) seconds', out) + if m: + self.duration = m.group(1) + + if re.search(' up ', out): + self.state = 'start' + elif re.search(' down ', out): + self.state = 'stopp' + else: + self.state = 'unknown' + return + + if re.search(' want ', out): + self.state += 'ing' + else: + self.state += 'ed' + + def start(self): + return self.execute_command([self.svc_cmd, '-u', self.svc_full]) + + def stopp(self): + return self.stop() + + def stop(self): + return self.execute_command([self.svc_cmd, '-d', self.svc_full]) + + def once(self): + return self.execute_command([self.svc_cmd, '-o', self.svc_full]) + + def reload(self): + return self.execute_command([self.svc_cmd, '-1', self.svc_full]) + + def execute_command(self, cmd): + try: + (rc, out, err) = self.module.run_command(' '.join(cmd)) + except Exception, e: + self.module.fail_json(msg="failed to execute: %s" % str(e)) + return (rc, out, err) + + + def report(self): + self.get_status() + return {k: self.__dict__[k] for k in self.report_vars} + +# =========================================== +# Main control flow + +def main(): + module = AnsibleModule( + argument_spec = dict( + name = dict(required=True), + state = dict(choices=['started', 'stopped', 'restarted', 'reloaded', 'once']), + enabled = dict(required=False, type='bool', choices=BOOLEANS), + downed = dict(required=False, type='bool', choices=BOOLEANS), + dist = dict(required=False, default='daemontools'), + service_dir = dict(required=False, default='/service'), + service_src = dict(required=False, default='/etc/service'), + ), + supports_check_mode=True, + ) + + state = module.params['state'] + enabled = module.params['enabled'] + downed = module.params['downed'] + + svc = Svc(module) + changed = False + orig_state = svc.report() + + if enabled is not None and enabled != svc.enabled: + changed = True + if not module.check_mode: + try: + if enabled: + svc.enable() + else: + svc.disable() + except (OSError, IOError) as e: + module.fail_json(msg="Could change service link: %s" % str(e)) + + if state is not None and state != svc.state: + changed = True + if not module.check_mode: + getattr(svc,state[:-2])() + + if downed is not None and downed != svc.downed: + changed = True + if not module.check_mode: + d_file = "%s/down" % svc.svc_full + try: + if downed: + open(d_file, "a").close() + else: + os.unlink(d_file) + except (OSError, IOError) as e: + module.fail_json(msg="Could change downed file: %s " % (str(e))) + + module.exit_json(changed=changed, svc=svc.report()) + + +# this is magic, not normal python include +from ansible.module_utils.basic import * + +main()