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#!/usr/bin/env python
# Backup and restore a stack.
from __future__ import print_function
__metaclass__ = type
from argparse import ArgumentParser
import logging
import os
import re
import subprocess
import sys
from deploy_stack import (
dump_env_logs,
get_machine_dns_name,
wait_for_state_server_to_shutdown,
)
from jujuconfig import (
get_jenv_path,
get_juju_home,
)
from jujupy import (
temp_bootstrap_env,
until_timeout,
make_client,
parse_new_state_server_from_error,
)
from substrate import (
terminate_instances,
)
from utility import (
ensure_deleted,
print_now,
)
running_instance_pattern = re.compile('\["([^"]+)"\]')
def setup_juju_path(juju_path):
"""Ensure the binaries and scripts under test are found first."""
full_path = os.path.abspath(juju_path)
if not os.path.isdir(full_path):
raise ValueError("The juju_path does not exist: %s" % full_path)
os.environ['PATH'] = '%s:%s' % (full_path, os.environ['PATH'])
sys.path.insert(0, full_path)
def deploy_stack(client, charm_prefix):
""""Deploy a simple stack, state-server and ubuntu."""
if charm_prefix and not charm_prefix.endswith('/'):
charm_prefix = charm_prefix + '/'
agent_version = client.get_matching_agent_version()
instance_id = client.get_status().status['machines']['0']['instance-id']
for ignored in until_timeout(30):
agent_versions = client.get_status().get_agent_versions()
if 'unknown' not in agent_versions and len(agent_versions) == 1:
break
if agent_versions.keys() != [agent_version]:
print_now("Current versions: %s" % ', '.join(agent_versions.keys()))
client.juju('upgrade-juju', ('--version', agent_version))
client.wait_for_version(client.get_matching_agent_version())
client.juju('deploy', (charm_prefix + 'ubuntu',))
client.wait_for_started().status
print_now("%s is ready to testing" % client.env.environment)
return instance_id
def restore_present_state_server(client, backup_file):
"""juju-restore won't restore when the state-server is still present."""
environ = dict(os.environ)
proc = subprocess.Popen(
['juju', '--show-log', 'restore', '-e', client.env.environment,
backup_file],
env=environ, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, err = proc.communicate()
if proc.returncode == 0:
raise Exception(
"juju-restore restored to an operational state-server: %s" % err)
else:
print_now(
"juju-restore correctly refused to restore "
"because the state-server was still up.")
match = running_instance_pattern.search(err)
if match is None:
print_now("WARNING: Could not find the instance_id in output:")
print_now(err)
print_now("")
return None
instance_id = match.group(1)
return instance_id
def delete_instance(client, instance_id):
"""Delete the instance using the providers tools."""
print_now("Instrumenting a bootstrap node failure.")
return terminate_instances(client.env, [instance_id])
def delete_extra_state_servers(client, instance_id):
"""Delete the extra state-server instances."""
status = client.get_status()
for machine, info in status.iter_machines():
extra_instance_id = info.get('instance-id')
status = info.get('state-server-member-status')
if extra_instance_id != instance_id and status is not None:
print_now("Deleting state-server-member {}".format(machine))
host = get_machine_dns_name(client, machine)
delete_instance(client, extra_instance_id)
wait_for_state_server_to_shutdown(host, client, extra_instance_id)
def restore_missing_state_server(client, backup_file):
"""juju-restore creates a replacement state-server for the services."""
environ = dict(os.environ)
print_now("Starting restore.")
proc = subprocess.Popen(
['juju', '--show-log', 'restore', '-e', client.env.environment,
'--constraints', 'mem=2G', backup_file],
env=environ, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, err = proc.communicate()
if proc.returncode != 0:
print_now('Call of juju restore exited with an error\n')
message = 'Restore failed: \n%s' % err
print_now(message)
print_now('\n')
raise Exception(message)
print_now(output)
client.wait_for_started(600).status
print_now("%s restored" % client.env.environment)
print_now("PASS")
def parse_args(argv=None):
parser = ArgumentParser('Test recovery strategies.')
parser.add_argument(
'--charm-prefix', help='A prefix for charm urls.', default='')
parser.add_argument(
'--debug', action='store_true', default=False,
help='Use --debug juju logging.')
strategy = parser.add_argument_group('test strategy')
strategy.add_argument(
'--ha', action='store_const', dest='strategy', const='ha',
default='backup', help="Test HA.")
strategy.add_argument(
'--backup', action='store_const', dest='strategy', const='backup',
help="Test backup/restore.")
strategy.add_argument(
'--ha-backup', action='store_const', dest='strategy',
const='ha-backup', help="Test backup/restore of HA.")
parser.add_argument('juju_path')
parser.add_argument('env_name')
parser.add_argument('logs', help='Directory to store logs in.')
parser.add_argument(
'temp_env_name', nargs='?',
help='Temporary environment name to use for this test.')
return parser.parse_args(argv)
def main(argv):
args = parse_args(argv)
log_dir = args.logs
try:
setup_juju_path(args.juju_path)
client = make_client(args.juju_path, args.debug, args.env_name,
args.temp_env_name)
juju_home = get_juju_home()
ensure_deleted(get_jenv_path(juju_home, client.env.environment))
with temp_bootstrap_env(juju_home, client):
client.bootstrap()
bootstrap_host = get_machine_dns_name(client, 0)
try:
instance_id = deploy_stack(client, args.charm_prefix)
if args.strategy in ('ha', 'ha-backup'):
client.juju('ensure-availability', ('-n', '3'))
client.wait_for_ha()
if args.strategy in ('ha-backup', 'backup'):
backup_file = client.backup()
restore_present_state_server(client, backup_file)
if args.strategy == 'ha-backup':
delete_extra_state_servers(client, instance_id)
delete_instance(client, instance_id)
wait_for_state_server_to_shutdown(bootstrap_host, client,
instance_id)
bootstrap_host = None
if args.strategy == 'ha':
client.get_status(600)
else:
restore_missing_state_server(client, backup_file)
except Exception as e:
if bootstrap_host is None:
bootstrap_host = parse_new_state_server_from_error(e)
raise
finally:
dump_env_logs(client, bootstrap_host, log_dir)
client.destroy_environment()
except Exception as e:
print_now("\nEXCEPTION CAUGHT:\n")
logging.exception(e)
if getattr(e, 'output', None):
print_now('\n')
print_now(e.output)
print_now("\nFAIL")
sys.exit(1)
if __name__ == '__main__':
main(sys.argv[1:])
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