Commit 5d5c98b9 authored by Xavier Thompson's avatar Xavier Thompson

promise/plugin: Implement check_service_state promise plugin

See merge request !90
parent 1eeef169
from zope.interface import implementer
from slapos.grid.promise import interface
from slapos.grid.promise.generic import GenericPromise
from slapos.grid.svcbackend import getSupervisorRPC
from slapos.grid.svcbackend import _getSupervisordSocketPath
import os
@implementer(interface.IPromise)
class RunPromise(GenericPromise):
def __init__(self, config):
super(RunPromise, self).__init__(config)
# SR can set custom periodicity
self.setPeriodicity(float(self.getConfig('frequency', 2)))
self.result_count = int(self.getConfig('result-count', 3))
self.failure_amount = int(self.getConfig('failure-amount', 3))
def sense(self):
"""
Check if a service is in the expected state
"""
service = self.getConfig('service')
expect = self.getConfig('expect', '')
if expect not in ("running", "stopped"):
self.logger.info("OK service %r is allowed to be in any state (expect = %r)", service, expect)
return
if not service:
self.logger.error("ERROR no service is specified")
return
run_directory = self.getConfig('run-directory', os.path.join(self.getPartitionFolder(), "srv", "runner", "var", "run"))
try:
supervisor_rpc = getSupervisorRPC(_getSupervisordSocketPath(run_directory, self.logger))
with supervisor_rpc as supervisor:
state = supervisor.getProcessInfo(service)['statename'].lower()
if state != expect:
self.logger.error("ERROR service %r is in state %r (expected %r)", service, state, expect)
else:
self.logger.info("OK service %r is in expected state %r", service, state)
except Exception as e:
self.logger.error("ERROR %r", e, exc_info=True)
def anomaly(self):
return self._anomaly(result_count=self.result_count, failure_amount=self.failure_amount)
##############################################################################
#
# Copyright (c) 2019 Vifib SARL and Contributors. All Rights Reserved.
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsibility of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# guarantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
##############################################################################
from slapos.grid.promise import PromiseError
from slapos.test.promise.plugin import TestPromisePluginMixin
from slapos.grid.svcbackend import getSupervisorRPC
import tempfile
import os
import unittest
import shutil
import textwrap
import subprocess
class TestCheckServiceState(TestPromisePluginMixin):
def setUp(self):
TestPromisePluginMixin.setUp(self)
self._tempdir = tempfile.mkdtemp()
self._supervisor_socket = os.path.join(self._tempdir, 'sv.sock')
self._supervisord_log = os.path.join(self._tempdir, 'supervisord.log')
self._supervisord_pid = os.path.join(self._tempdir, 'supervisord.pid')
self._supervisor_config = os.path.join(self._tempdir, 'supervisor.conf')
self._service_name = 'test-service'
self._test_log = os.path.join(self._tempdir, '%s.log' % (self._service_name,))
with open(self._supervisor_config, 'w') as f:
f.write(textwrap.dedent(
"""
[unix_http_server]
file = {self._supervisor_socket}
[supervisorctl]
serverurl = unix://{self._supervisor_socket}
[supervisord]
logfile = {self._supervisord_log}
pidfile = {self._supervisord_pid}
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
[program:{self._service_name}]
command = sleep 10000
autostart = false
autorestart = false
startretries = 0
startsecs = 0
redirect_stderr = true
stdout_logfile = {self._test_log}
""").format(**locals()))
subprocess.check_output(
['supervisord', '--configuration', self._supervisor_config],
cwd=self._tempdir,
)
self.promise_name = 'check-service-state.py'
self.base_content = textwrap.dedent(
"""
from slapos.promise.plugin.check_service_state import RunPromise
extra_config_dict = {
'run-directory': %(rundir)r,
'service': %(service)r,
'expect': %%(expect)r,
}
""") % {'rundir': self._tempdir, 'service': self._service_name}
def tearDown(self):
TestPromisePluginMixin.tearDown(self)
with getSupervisorRPC(self._supervisor_socket) as supervisor:
supervisor.stopAllProcesses()
supervisor.shutdown()
shutil.rmtree(self._tempdir)
def test_running_expect_running(self):
with getSupervisorRPC(self._supervisor_socket) as supervisor:
supervisor.startProcess(self._service_name)
assert supervisor.getProcessInfo(self._service_name)['statename'] == 'RUNNING'
content = self.base_content % {'expect': 'running'}
self.writePromise(self.promise_name, content)
self.configureLauncher()
self.launcher.run()
result = self.getPromiseResult(self.promise_name)
self.assertEqual(result['result']['failed'], False)
self.assertEqual(
result['result']['message'],
"OK service %r is in expected state 'running'" % (self._service_name,)
)
def test_running_expect_stopped(self):
with getSupervisorRPC(self._supervisor_socket) as supervisor:
supervisor.startProcess(self._service_name)
assert supervisor.getProcessInfo(self._service_name)['statename'] == 'RUNNING'
content = self.base_content % {'expect': 'stopped'}
self.writePromise(self.promise_name, content)
self.configureLauncher()
with self.assertRaises(PromiseError):
self.launcher.run()
result = self.getPromiseResult(self.promise_name)
self.assertEqual(result['result']['failed'], True)
self.assertEqual(
result['result']['message'],
"ERROR service %r is in state 'running' (expected 'stopped')" % (self._service_name,)
)
def test_running_expect_undefined(self):
with getSupervisorRPC(self._supervisor_socket) as supervisor:
supervisor.startProcess(self._service_name)
assert supervisor.getProcessInfo(self._service_name)['statename'] == 'RUNNING'
content = self.base_content % {'expect': 'undefined'}
self.writePromise(self.promise_name, content)
self.configureLauncher()
self.launcher.run()
result = self.getPromiseResult(self.promise_name)
self.assertEqual(result['result']['failed'], False)
self.assertEqual(
result['result']['message'],
"OK service %r is allowed to be in any state (expect = 'undefined')" % (self._service_name,)
)
def test_stopped_expect_running(self):
with getSupervisorRPC(self._supervisor_socket) as supervisor:
assert supervisor.getProcessInfo(self._service_name)['statename'] == 'STOPPED'
content = self.base_content % {'expect': 'running'}
self.writePromise(self.promise_name, content)
self.configureLauncher()
with self.assertRaises(PromiseError):
self.launcher.run()
result = self.getPromiseResult(self.promise_name)
self.assertEqual(result['result']['failed'], True)
self.assertEqual(
result['result']['message'],
"ERROR service %r is in state 'stopped' (expected 'running')" % (self._service_name,)
)
def test_stopped_expect_stopped(self):
with getSupervisorRPC(self._supervisor_socket) as supervisor:
assert supervisor.getProcessInfo(self._service_name)['statename'] == 'STOPPED'
content = self.base_content % {'expect': 'stopped'}
self.writePromise(self.promise_name, content)
self.configureLauncher()
self.launcher.run()
result = self.getPromiseResult(self.promise_name)
self.assertEqual(result['result']['failed'], False)
self.assertEqual(
result['result']['message'],
"OK service %r is in expected state 'stopped'" % (self._service_name,)
)
def test_stopped_expect_undefined(self):
with getSupervisorRPC(self._supervisor_socket) as supervisor:
assert supervisor.getProcessInfo(self._service_name)['statename'] == 'STOPPED'
content = self.base_content % {'expect': 'undefined'}
self.writePromise(self.promise_name, content)
self.configureLauncher()
self.launcher.run()
result = self.getPromiseResult(self.promise_name)
self.assertEqual(result['result']['failed'], False)
self.assertEqual(
result['result']['message'],
"OK service %r is allowed to be in any state (expect = 'undefined')" % (self._service_name,)
)
if __name__ == '__main__':
unittest.main()
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