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#!/usr/bin/env python
from collections import defaultdict
from contextlib import contextmanager
from datetime import (
datetime,
timedelta,
)
import logging
import os
import subprocess
import sys
from jujucharm import (
local_charm_path,
)
from remote import remote_from_unit
from utility import (
until_timeout,
)
__metaclass__ = type
@contextmanager
def background_chaos(env, client, log_dir, time):
monkey = MonkeyRunner(env, client, enablement_timeout=time)
monkey.deploy_chaos_monkey()
monkey_ids = monkey.unleash_once()
monkey.wait_for_chaos(state='start')
try:
yield
monkey.wait_for_chaos(state='complete', timeout=time)
except BaseException as e:
logging.exception(e)
sys.exit(1)
finally:
# Copy the chaos logs to the log directory.
# Get the remote machine. Currently the remote machine will always be
# ubuntu/0. IF background_chaos() is enhanced to take a target service,
# then log collection will also need to be updated.
remote = remote_from_unit(client, "ubuntu/0")
for id in monkey_ids:
monkey_log = ['chaos-monkey/chaos_monkey.{}/log/*'.format(id)]
dest_dir = '{}/chaos-monkey-{}'.format(log_dir, id)
os.mkdir(dest_dir)
try:
remote.copy(dest_dir, monkey_log)
except subprocess.CalledProcessError as e:
logging.warning(
'Could not retrieve Chaos Monkey log for {}:'.format(id))
logging.warning(e.output)
class MonkeyRunner:
def __init__(self, env, client, service='0', health_checker=None,
enablement_timeout=120, pause_timeout=0, total_timeout=0):
self.env = env
if service == '0':
self.service = 'ubuntu'
self.machine = '0'
else:
self.service = service
self.machine = None
self.health_checker = health_checker
self.client = client
self.enablement_timeout = enablement_timeout
self.pause_timeout = pause_timeout
self.total_timeout = total_timeout
self.expire_time = (datetime.now() + timedelta(seconds=total_timeout))
self.monkey_ids = {}
def deploy_chaos_monkey(self):
"""Juju deploy chaos-monkey and add a relation.
JUJU_REPOSITORY must be set in the OS environment so a local
chaos-monkey charm can be found.
"""
if self.machine:
logging.debug(
'Deploying ubuntu to machine {}.'.format(self.machine))
charm = local_charm_path(
charm='ubuntu', juju_ver=self.client.version)
self.client.deploy(charm, to=self.machine)
logging.debug('Deploying local:chaos-monkey.')
charm = local_charm_path(
charm='chaos-monkey', juju_ver=self.client.version)
self.client.deploy(charm)
logging.debug('Relating chaos-monkey to {}.'.format(self.service))
self.client.juju('add-relation', (self.service, 'chaos-monkey'))
logging.debug('Waiting for services to start.')
self.client.wait_for_started()
self.client.wait_for_subordinate_units(self.service, 'chaos-monkey')
def iter_chaos_monkey_units(self):
status = self.client.get_status()
for unit_name, unit in status.service_subordinate_units(self.service):
if not unit_name.startswith('chaos-monkey'):
continue
yield unit_name, unit
def unleash_once(self):
for unit_name, unit in self.iter_chaos_monkey_units():
logging.info('Starting the chaos monkey on: {}'.format(unit_name))
enablement_arg = ('enablement-timeout={}'.format(
self.enablement_timeout))
monkey_id = self.monkey_ids.get(unit_name)
args = (unit_name,) + ('start',) + ('mode=single',)
args = args + (enablement_arg,)
if monkey_id is not None:
args = args + ('monkey-id={}'.format(monkey_id),)
id = self.client.action_do(*args)
if not self.monkey_ids.get(unit_name):
logging.info('Setting the monkey-id for {} to: {}'.format(
unit_name, id))
self.monkey_ids[unit_name] = id
return self.monkey_ids.values()
def is_healthy(self):
"""Returns a boolean after running the health_checker."""
if self.health_checker:
try:
sub_output = subprocess.check_output(self.health_checker)
logging.info('Health check output: {}'.format(sub_output))
except OSError as e:
logging.error(
'The health check failed to execute with: {}'.format(
e))
raise
except subprocess.CalledProcessError as e:
logging.error('Non-zero exit code returned from {}: {}'.format(
self.health_checker, e))
logging.error(e.output)
return False
return True
def get_unit_status(self, unit_name):
"""Return 'done' if no lock file otherwise 'running'"""
service_config = self.client.get_service_config('chaos-monkey')
logging.debug('{}'.format(service_config))
logging.debug('Checking if chaos is done on: {}'.format(unit_name))
check_cmd = '[ -f '
check_cmd += service_config['settings']['chaos-dir']['value']
check_cmd += '/chaos_monkey.' + self.monkey_ids[unit_name]
check_cmd += '/chaos_runner.lock'
check_cmd += ' ]'
if self.client.juju('run', ('--unit', unit_name, check_cmd),
check=False):
return 'done'
return 'running'
def wait_for_chaos(self, state='complete', timeout=300):
if not ('complete' in state or 'start' in state):
raise Exception('Unexpected state value: {}'.format(state))
for ignored in until_timeout(timeout):
locks = defaultdict(list)
for unit_name, unit in self.iter_chaos_monkey_units():
locks[self.get_unit_status(unit_name)].append(unit_name)
if state == 'complete' and locks.keys() == ['done']:
logging.debug(
'All lock files removed, chaos complete: {}'.format(locks))
break
if state == 'start' and locks.keys() == ['running']:
logging.debug(
'All lock files found, chaos started: {}'.format(locks))
break
else:
raise Exception('Chaos operations did not {}.'.format(state))
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