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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
from string import Template
from time import sleep
import dbus
TEMPLATE = '''# ${service_name}
# autogenerated by Kolla-Ansible
[Unit]
Description=${engine} ${service_name}
After=${deps}
Wants=${deps}
PartOf=kolla.target
StartLimitInterval=${restart_timeout}
StartLimitBurst=${restart_retries}
[Service]
ExecStart=/usr/bin/${engine} start -a ${name}
ExecStop=/usr/bin/${engine} stop ${name} -t ${graceful_timeout}
Restart=${restart_policy}
RestartSec=${restart_duration}
SuccessExitStatus=143
[Install]
WantedBy=multi-user.target
'''
class SystemdWorker(object):
def __init__(self, params):
name = params.get('name', None)
# systemd is not needed
if not name:
return None
container_engine = params.get('container_engine')
if container_engine == 'docker':
dependencies = 'docker.service'
else:
dependencies = 'network-online.target'
restart_policy = params.get('restart_policy', 'no')
if restart_policy == 'unless-stopped':
restart_policy = 'always'
# NOTE(hinermar): duration * retries should be less than timeout
# otherwise service will indefinitely try to restart.
# Also, correct timeout and retries values should probably be
# checked at the module level inside kolla_container.py
restart_timeout = params.get('client_timeout', 120)
restart_retries = params.get('restart_retries', 10)
restart_duration = (restart_timeout // restart_retries) - 1
# container info
self.container_dict = dict(
name=name,
service_name='kolla-' + name + '-container.service',
engine=container_engine,
deps=dependencies,
graceful_timeout=params.get('graceful_timeout'),
restart_policy=restart_policy,
restart_timeout=restart_timeout,
restart_retries=restart_retries,
restart_duration=restart_duration
)
# systemd
self.manager = self.get_manager()
self.job_mode = 'replace'
self.sysdir = '/etc/systemd/system/'
# templating
self.template = Template(TEMPLATE)
def get_manager(self):
sysbus = dbus.SystemBus()
systemd1 = sysbus.get_object(
'org.freedesktop.systemd1',
'/org/freedesktop/systemd1'
)
return dbus.Interface(systemd1, 'org.freedesktop.systemd1.Manager')
def start(self):
if self.perform_action(
'StartUnit',
self.container_dict['service_name'],
self.job_mode
):
return self.wait_for_unit(self.container_dict['restart_timeout'])
return False
def restart(self):
if self.perform_action(
'RestartUnit',
self.container_dict['service_name'],
self.job_mode
):
return self.wait_for_unit(self.container_dict['restart_timeout'])
return False
def stop(self):
if self.perform_action(
'StopUnit',
self.container_dict['service_name'],
self.job_mode
):
return self.wait_for_unit(
self.container_dict['restart_timeout'],
state='dead'
)
return False
def reload(self):
return self.perform_action(
'Reload',
self.container_dict['service_name'],
self.job_mode
)
def enable(self):
return self.perform_action(
'EnableUnitFiles',
[self.container_dict['service_name']],
False,
True
)
def perform_action(self, function, *args):
try:
getattr(self.manager, function)(*args)
return True
except Exception:
return False
def check_unit_file(self):
return os.path.isfile(
self.sysdir + self.container_dict['service_name']
)
def check_unit_change(self, new_content=''):
if not new_content:
new_content = self.generate_unit_file()
if self.check_unit_file():
with open(
self.sysdir + self.container_dict['service_name'], 'r'
) as f:
curr_content = f.read()
# return whether there was change in the unit file
return curr_content != new_content
return True
def generate_unit_file(self):
return self.template.substitute(self.container_dict)
def create_unit_file(self):
file_content = self.generate_unit_file()
if self.check_unit_change(file_content):
with open(
self.sysdir + self.container_dict['service_name'], 'w'
) as f:
f.write(file_content)
self.reload()
self.enable()
return True
return False
def remove_unit_file(self):
if self.check_unit_file():
os.remove(self.sysdir + self.container_dict['service_name'])
self.reload()
return True
else:
return False
def get_unit_state(self):
unit_list = self.manager.ListUnits()
for service in unit_list:
if str(service[0]) == self.container_dict['service_name']:
return str(service[4])
return None
def wait_for_unit(self, timeout, state='running'):
delay = 5
elapsed = 0
while True:
if self.get_unit_state() == state:
return True
elif elapsed > timeout:
return False
else:
sleep(delay)
elapsed += delay
|
