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Merge pull request #1668 from eest/refactor_service_module

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Repost: Refactor service module to use subclasses like user module.
This commit is contained in:
Michael DeHaan 2012-11-23 13:19:09 -08:00
commit ac09b47ec4
1 changed files with 364 additions and 237 deletions
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601
library/service
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@ -74,163 +74,312 @@ import platform
import os
import re
SERVICE = None
CHKCONFIG = None
INITCTL = None
INITSCRIPT = None
RCCONF = None
class Service(object):
"""
This is the generic Service manipulation class that is subclassed
based on platform.
PS_OPTIONS = 'auxww'
A subclass should override the following action methods:-
- get_service_tools
- service_enable
- get_service_status
- service_control
def _find_binaries(m,name):
# list of possible paths for service/chkconfig binaries
# with the most probable first
global SERVICE
global CHKCONFIG
global INITCTL
global INITSCRIPT
global RCCONF
paths = ['/sbin', '/usr/sbin', '/bin', '/usr/bin']
binaries = [ 'service', 'chkconfig', 'update-rc.d', 'initctl', 'systemctl']
initpaths = [ '/etc/init.d','/etc/rc.d','/usr/local/etc/rc.d' ]
rcpaths = [ '/etc/rc.conf','/usr/local/etc/rc.conf' ]
location = dict()
All subclasses MUST define platform and distribution (which may be None).
"""
for binary in binaries:
location[binary] = None
platform = 'Generic'
distribution = None
for binary in binaries:
location[binary] = m.get_bin_path(binary)
def __new__(cls, *args, **kwargs):
return load_platform_subclass(Service, args, kwargs)
if location.get('systemctl', None):
CHKCONFIG = location['systemctl']
elif location.get('chkconfig', None):
CHKCONFIG = location['chkconfig']
elif location.get('update-rc.d', None):
CHKCONFIG = location['update-rc.d']
else:
for rcfile in rcpaths:
if os.path.isfile(rcfile):
RCCONF = rcfile
if not CHKCONFIG and not RCCONF:
m.fail_json(msg='unable to find chkconfig or update-rc.d binary')
if location.get('service', None):
SERVICE = location['service']
else:
for rcdir in initpaths:
initscript = "%s/%s" % (rcdir,name)
if os.path.isfile(initscript):
INITSCRIPT = initscript
if not SERVICE and not INITSCRIPT:
m.fail_json(msg='unable to find service binary nor initscript')
if location.get('initctl', None):
INITCTL = location['initctl']
else:
INITCTL = None
def __init__(self, module):
self.module = module
self.name = module.params['name']
self.state = module.params['state']
self.pattern = module.params['pattern']
self.enable = module.boolean(module.params.get('enabled', None))
self.changed = False
self.running = None
self.action = None
self.svc_cmd = None
self.svc_initscript = None
self.svc_initctl = None
self.enable_cmd = None
self.arguments = module.params.get('arguments', '')
def _get_service_status(name, pattern, arguments):
rc, status_stdout, status_stderr = _run("%s %s status %s" % (SERVICE, name, arguments))
# select whether we dump additional debug info through syslog
self.syslogging = False
# set the running state to None because we don't know it yet
running = None
# ===========================================
# Platform specific methods (must be replaced by subclass).
# If pattern is provided, search for that
# before checking initctl, service output, and other tricks
if pattern is not None:
def get_service_tools(self):
self.module.fail_json(msg="get_service_tools not implemented on target platform")
psbin = '/bin/ps'
if not os.path.exists(psbin):
if os.path.exists('/usr/bin/ps'):
psbin = '/usr/bin/ps'
def service_enable(self):
self.module.fail_json(msg="service_enable not implemented on target platform")
def get_service_status(self):
self.module.fail_json(msg="get_service_status not implemented on target platform")
def service_control(self):
self.module.fail_json(msg="service_control not implemented on target platform")
# ===========================================
# Generic methods that should be used on all platforms.
def execute_command(self, cmd):
if self.syslogging:
syslog.openlog('ansible-%s' % os.path.basename(__file__))
syslog.syslog(syslog.LOG_NOTICE, 'Command %s' % '|'.join(cmd))
p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(out, err) = p.communicate()
rc = p.returncode
return (rc, out, err)
def check_ps(self):
# Set ps flags
if platform.system() == 'SunOS':
psflags = '-ef'
else:
psflags = 'auxww'
# Find ps binary
psbin = self.module.get_bin_path('ps', True)
(rc, psout, pserr) = self.execute_command('%s %s' % (psbin, psflags))
# If rc is 0, set running as appropriate
if rc == 0:
self.running = False
lines = psout.split("\n")
for line in lines:
if self.pattern in line and not "pattern=" in line:
# so as to not confuse ./hacking/test-module
self.running = True
break
def check_service_changed(self):
if self.state and self.running == None:
self.module.fail_json(msg="failed determining the current service state => state stays unchanged")
# Find out if state has changed
if not self.running and self.state in ["started", "running"]:
self.changed = True
elif self.running and self.state in ["stopped","reloaded"]:
self.changed = True
elif self.state == "restarted":
self.changed = True
def modify_service_state(self):
# Only do something if state will change
if self.changed:
# Control service
if self.state in ['started', 'running']:
self.action = "start"
elif self.state == 'stopped':
self.action = "stop"
elif self.state == 'reloaded':
self.action = "reload"
elif self.state == 'restarted':
self.action = "restart"
return self.service_control()
else:
# If nothing needs to change just say all is well
rc = 0
err = ''
out = ''
return rc, out, err
# ===========================================
# Subclass: Linux
class LinuxService(Service):
"""
This is the Linux Service manipulation class - it is currently supporting
a mixture of binaries and init scripts for controlling services started at
boot, as well as for controlling the current state.
"""
platform = 'Linux'
distribution = None
def get_service_tools(self):
paths = [ '/sbin', '/usr/sbin', '/bin', '/usr/bin' ]
binaries = [ 'service', 'chkconfig', 'update-rc.d', 'initctl', 'systemctl' ]
initpaths = [ '/etc/init.d' ]
location = dict()
for binary in binaries:
location[binary] = None
for binary in binaries:
location[binary] = self.module.get_bin_path(binary)
# Locate a tool for enable options
if location.get('systemctl', None):
self.enable_cmd = location['systemctl']
elif location.get('chkconfig', None):
self.enable_cmd = location['chkconfig']
elif location.get('update-rc.d', None):
self.enable_cmd = location['update-rc.d']
if self.enable_cmd is None:
self.module.fail_json(msg='unable to find enable binary')
# Locate a tool for runtime service management (start, stop etc.)
if location.get('service', None):
self.svc_cmd = location['service']
else:
for initdir in initpaths:
initscript = "%s/%s" % (initdir,self.name)
if os.path.isfile(initscript):
self.svc_initscript = initscript
if not self.svc_cmd and not self.svc_initscript:
self.module.fail_json(msg='unable to find service binary nor initscript')
if location.get('initctl', None):
self.svc_initctl = location['initctl']
def get_service_status(self):
rc, status_stdout, status_stderr = self.execute_command("%s %s status %s" % (self.svc_cmd, self.name, self.arguments))
# Check if we got upstart on the system and then the job state
if self.svc_initctl != None and self.running is None:
# check the job status by upstart response
initctl_rc, initctl_status_stdout, initctl_status_stderr = self.execute_command("%s status %s" % (self.svc_initctl, self.name))
if initctl_status_stdout.find("stop/waiting") != -1:
self.running = False
elif initctl_status_stdout.find("start/running") != -1:
self.running = True
# if the job status is still not known check it by response code
if self.running == None:
if rc == 3:
self.running = False
if rc == 2:
self.running = False
elif rc == 0:
self.running = True
# if the job status is still not known check it by status output keywords
if self.running == None:
# first tranform the status output that could irritate keyword matching
cleanout = status_stdout.lower().replace(self.name.lower(), '')
if "stop" in cleanout:
self.running = False
elif "run" in cleanout and "not" in cleanout:
self.running = False
elif "run" in cleanout and "not" not in cleanout:
self.running = True
elif "start" in cleanout and "not" not in cleanout:
self.running = True
elif 'could not access pid file' in cleanout:
self.running = False
elif 'is dead and pid file exists' in cleanout:
self.running = False
elif 'dead but subsys locked' in cleanout:
self.running = False
elif 'dead but pid file exists' in cleanout:
self.running = False
# if the job status is still not known check it by special conditions
if self.running == None:
if self.name == 'iptables' and status_stdout.find("ACCEPT") != -1:
# iptables status command output is lame
# TODO: lookup if we can use a return code for this instead?
self.running = True
def service_enable(self):
# we change argument depending on real binary used
# update-rc.d wants enable/disable while
# chkconfig wants on/off
# also, systemctl needs the arguments reversed
if self.enable:
on_off = "on"
enable_disable = "enable"
else:
on_off = "off"
enable_disable = "disable"
if self.enable_cmd.endswith("update-rc.d"):
args = (self.enable_cmd, self.name, enable_disable)
elif self.enable_cmd.endswith("systemctl"):
args = (self.enable_cmd, enable_disable, self.name + ".service")
else:
args = (self.enable_cmd, self.name, on_off)
if self.enable is not None:
return self.execute_command("%s %s %s" % args)
def service_control(self):
# Decide what command to run
if self.svc_cmd:
svc_cmd = "%s %s" % (self.svc_cmd, self.name)
elif self.svc_initscript:
svc_cmd = "%s" % self.svc_initscript
if self.action is not "restart":
rc_state, stdout, stderr = self.execute_command("%s %s %s" % (svc_cmd, self.action, self.arguments))
else:
rc1, stdout1, stderr1 = self.execute_command("%s %s %s" % (svc_cmd, stop, self.arguments))
rc2, stdout2, stderr2 = self.execute_command("%s %s %s" % (svc_cmd, start, self.arguments))
if rc1 != 0 and rc2 == 0:
rc_state = rc + rc2
stdout = stdout2
stderr = stderr2
else:
psbin = None
rc_state = rc + rc1 + rc2
stdout = stdout1 + stdout2
stderr = stderr1 + stderr2
if psbin is not None:
(rc, psout, pserr) = _run('%s %s' % (psbin, PS_OPTIONS))
# If rc is 0, set running as appropriate
# If ps command fails, fall back to other means.
if rc == 0:
running = False
lines = psout.split("\n")
for line in lines:
if pattern in line and not "pattern=" in line:
# so as to not confuse ./hacking/test-module
running = True
break
return(rc_state, stdout, stderr)
# Check if we got upstart on the system and then the job state
if INITCTL != None and running is None:
# check the job status by upstart response
initctl_rc, initctl_status_stdout, initctl_status_stderr = _run("%s status %s" % (INITCTL, name))
if initctl_status_stdout.find("stop/waiting") != -1:
running = False
elif initctl_status_stdout.find("start/running") != -1:
running = True
# ===========================================
# Subclass: FreeBSD
# if the job status is still not known check it by response code
if running == None:
if rc == 3:
running = False
if rc == 2:
running = False
class FreeBsdService(Service):
"""
This is the FreeBSD Service manipulation class - it uses the /etc/rc.conf
file for controlling services started at boot and the 'service' binary to
check status and perform direct service manipulation.
"""
platform = 'FreeBSD'
distribution = None
def get_service_tools(self):
self.svc_cmd = self.module.get_bin_path('service', True)
if not self.svc_cmd:
self.module.fail_json(msg='unable to find service binary')
def get_service_status(self):
rc, stdout, stderr = self.execute_command("%s %s %s" % (self.svc_cmd, self.name, 'onestatus'))
if rc == 1:
self.running = False
elif rc == 0:
running = True
self.running = True
# if the job status is still not known check it by status output keywords
if running == None:
# first tranform the status output that could irritate keyword matching
cleanout = status_stdout.lower().replace(name.lower(), '')
if "stop" in cleanout:
running = False
elif "run" in cleanout and "not" in cleanout:
running = False
elif "run" in cleanout and "not" not in cleanout:
running = True
elif "start" in cleanout and "not" not in cleanout:
running = True
elif 'could not access pid file' in cleanout:
running = False
elif 'is dead and pid file exists' in cleanout:
running = False
elif 'dead but subsys locked' in cleanout:
running = False
elif 'dead but pid file exists' in cleanout:
running = False
def service_enable(self):
if self.enable:
rc = "YES"
else:
rc = "NO"
# if the job status is still not known check it by special conditions
if running == None:
if name == 'iptables' and status_stdout.find("ACCEPT") != -1:
# iptables status command output is lame
# TODO: lookup if we can use a return code for this instead?
running = True
rcfiles = [ '/etc/rc.conf','/usr/local/etc/rc.conf' ]
for rcfile in rcfiles:
if os.path.isfile(rcfile):
rcconf = rcfile
return running
def _run(cmd):
# returns (rc, stdout, stderr) from shell command
process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
stdout, stderr = process.communicate()
return (process.returncode, stdout, stderr)
def _do_enable(name, enable):
# we change argument depending on real binary used
# update-rc.d wants enable/disable while
# chkconfig wants on/off
# also, systemctl needs the arguments reversed
if enable:
on_off = "on"
enable_disable = "enable"
rc = "YES"
else:
on_off = "off"
enable_disable = "disable"
rc = "NO"
if RCCONF:
entry = "%s_enable" % name
entry = "%s_enable" % self.name
full_entry = '%s="%s"' % (entry,rc)
rc = open(RCCONF,"r+")
rc = open(rcconf,"r+")
rctext = rc.read()
if re.search("^%s" % full_entry,rctext,re.M) is None:
if re.search("^%s" % entry,rctext,re.M) is None:
@ -242,20 +391,52 @@ def _do_enable(name, enable):
rc.write(rctext)
rc.close()
rc=0
stderr=stdout=''
else:
if CHKCONFIG.endswith("update-rc.d"):
args = (CHKCONFIG, name, enable_disable)
elif CHKCONFIG.endswith("systemctl"):
args = (CHKCONFIG, enable_disable, name + ".service")
else:
args = (CHKCONFIG, name, on_off)
def service_control(self):
if self.action is "start":
self.action = "onestart"
if self.action is "stop":
self.action = "onestop"
if self.action is "reload":
self.action = "onereload"
if enable is not None:
rc, stdout, stderr = _run("%s %s %s" % args)
return self.execute_command("%s %s %s" % (self.svc_cmd, self.name, self.action))
return rc, stdout, stderr
# ===========================================
# Subclass: OpenBSD
class OpenBsdService(Service):
"""
This is the OpenBSD Service manipulation class - it uses /etc/rc.d for
service control. Enabling a service is currently not supported because the
<service>_flags variable is not boolean, you should supply a rc.conf.local
file in some other way.
"""
platform = 'OpenBSD'
distribution = None
def get_service_tools(self):
rcdir = '/etc/rc.d'
rc_script = "%s/%s" % (rcdir, self.name)
if os.path.isfile(rc_script):
self.svc_cmd = rc_script
if not self.svc_cmd:
self.module.fail_json(msg='unable to find rc.d script')
def get_service_status(self):
rc, stdout, stderr = self.execute_command("%s %s" % (self.svc_cmd, 'check'))
if rc == 1:
self.running = False
elif rc == 0:
self.running = True
def service_control(self):
return self.execute_command("%s %s" % (self.svc_cmd, self.action))
# ===========================================
# Main control flow
def main():
module = AnsibleModule(
@ -268,105 +449,51 @@ def main():
)
)
name = module.params['name']
state = module.params['state']
pattern = module.params['pattern']
enable = module.boolean(module.params.get('enabled', None))
arguments = module.params.get('arguments', '')
service = Service(module)
# Set PS options here if 'ps auxww' will not work on
# target platform
if platform.system() == 'SunOS':
global PS_OPTIONS
PS_OPTIONS = '-ef'
if service.syslogging:
syslog.openlog('ansible-%s' % os.path.basename(__file__))
syslog.syslog(syslog.LOG_NOTICE, 'Service instantiated - platform %s' % service.platform)
if service.distribution:
syslog.syslog(syslog.LOG_NOTICE, 'Service instantiated - distribution %s' % service.distribution)
# ===========================================
# find binaries locations on minion
_find_binaries(module,name)
# ===========================================
# get service status
running = _get_service_status(name, pattern, arguments)
# ===========================================
# Some common variables
changed = False
rc = 0
err = ''
out = ''
err = ''
result = {}
result['name'] = service.name
result['state'] = service.state
# set command to run
if SERVICE:
svc_cmd = "%s %s" % (SERVICE, name)
elif INITSCRIPT:
svc_cmd = "%s" % INITSCRIPT
# Find service management tools
service.get_service_tools()
if module.params['enabled']:
rc_enable, out_enable, err_enable = _do_enable(name, enable)
rc += rc_enable
out += out_enable
err += err_enable
# Enable/disable service startup at boot if requested
if service.module.params['enabled']:
service.service_enable()
if state and running == None:
module.fail_json(msg="failed determining the current service state => state stays unchanged", changed=False)
# Collect service status
if service.pattern:
service.check_ps()
service.get_service_status()
elif state:
# a state change command has been requested
# Calculate if request will change service state
service.check_service_changed()
# ===========================================
# determine if we are going to change anything
if not running and state in ["started", "running"]:
changed = True
elif running and state in ["stopped","reloaded"]:
changed = True
elif state == "restarted":
changed = True
# ===========================================
# run change commands if we need to
if changed:
if platform.system() == 'FreeBSD':
start = "onestart"
stop = "onestop"
reload = "onereload"
else:
start = "start"
stop = "stop"
reload = "reload"
if state in ['started', 'running']:
rc_state, stdout, stderr = _run("%s %s %s" % (svc_cmd, start, arguments))
elif state == 'stopped':
rc_state, stdout, stderr = _run("%s %s %s" % (svc_cmd, stop, arguments))
elif state == 'reloaded':
rc_state, stdout, stderr = _run("%s %s %s" % (svc_cmd, reload, arguments))
elif state == 'restarted':
rc1, stdout1, stderr1 = _run("%s %s %s" % (svc_cmd, stop, arguments))
rc2, stdout2, stderr2 = _run("%s %s %s" % (svc_cmd, start, arguments))
if rc1 != 0 and rc2 == 0:
rc_state = rc + rc2
stdout = stdout2
stderr = stderr2
else:
rc_state = rc + rc1 + rc2
stdout = stdout1 + stdout2
stderr = stderr1 + stderr2
out += stdout
err += stderr
rc = rc + rc_state
# Modify service state if necessary
(rc, out, err) = service.modify_service_state()
if rc != 0:
module.fail_json(msg=err)
if err:
module.fail_json(msg=err)
else:
module.fail_json(msg=out)
result = {"changed": changed}
if module.params['enabled']:
result['enabled'] = module.params['enabled']
if state:
result['state'] = state
result['changed'] = service.changed
if service.module.params['enabled']:
result['enabled'] = service.module.params['enabled']
if service.state:
result['state'] = service.state
rc, stdout, stderr = _run("%s status %s" % (svc_cmd, arguments))
module.exit_json(**result)
# this is magic, see lib/ansible/module_common.py