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#!/usr/bin/env python
# Backup and restore a stack.
from __future__ import print_function
from argparse import ArgumentParser
from contextlib import contextmanager
import logging
import re
from subprocess import CalledProcessError
import sys
from deploy_stack import (
BootstrapManager,
wait_for_state_server_to_shutdown,
)
from jujupy import (
make_client,
parse_new_state_server_from_error,
)
from substrate import (
terminate_instances,
)
from utility import (
LoggedException,
print_now,
)
__metaclass__ = type
running_instance_pattern = re.compile('\["([^"]+)"\]')
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 + '/'
client.juju('deploy', (charm_prefix + 'ubuntu',))
client.wait_for_started().status
print_now("%s is ready to testing" % client.env.environment)
def restore_present_state_server(admin_client, backup_file):
"""juju-restore won't restore when the state-server is still present."""
try:
output = admin_client.restore_backup(backup_file)
except CalledProcessError as e:
print_now(
"juju-restore correctly refused to restore "
"because the state-server was still up.")
match = running_instance_pattern.search(e.stderr)
if match is None:
print_now("WARNING: Could not find the instance_id in output:")
print_now(e.stderr)
print_now("")
return None
return match.group(1)
else:
raise Exception(
"juju-restore restored to an operational state-server: %s" %
output)
def delete_controller_members(client, leader_only=False):
"""Delete controller members.
The all members are delete by default. The followers are deleted before the
leader to simulates a total controller failure. When leader_only is true,
the leader is deleted to trigger a new leader election.
"""
if leader_only:
leader = client.get_controller_leader()
members = [leader]
else:
members = client.get_controller_members()
members.reverse()
deleted_machines = []
for machine in members:
instance_id = machine.info.get('instance-id')
host = machine.info.get('dns-name')
print_now("Instrumenting node failure for member {}: {} at {}".format(
machine.machine_id, instance_id, host))
terminate_instances(client.env, [instance_id])
wait_for_state_server_to_shutdown(host, client, instance_id)
deleted_machines.append(machine.machine_id)
return deleted_machines
def restore_missing_state_server(client, admin_client, backup_file):
"""juju-restore creates a replacement state-server for the services."""
print_now("Starting restore.")
try:
output = admin_client.restore_backup(backup_file)
except CalledProcessError as e:
print_now('Call of juju restore exited with an error\n')
print_now('Call: {} \n'.format(e.cmd))
message = 'Restore failed: \n%s' % e.stderr
print_now(message)
print_now('\n')
logging.exception(e)
raise LoggedException(e)
print_now(output)
admin_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.')
parser.add_argument(
'--agent-stream', help='Stream for retrieving agent binaries.')
parser.add_argument(
'--series', help='Name of the Ubuntu series to use.')
return parser.parse_args(argv)
def make_client_from_args(args):
return make_client(args.juju_path, args.debug, args.env_name,
args.temp_env_name)
@contextmanager
def detect_bootstrap_machine(bs_manager):
try:
yield
except Exception as e:
bs_manager.known_hosts['0'] = parse_new_state_server_from_error(e)
raise
def assess_recovery(bs_manager, strategy, charm_prefix):
client = bs_manager.client
deploy_stack(client, charm_prefix)
admin_client = client.get_admin_client()
if strategy in ('ha', 'ha-backup'):
admin_client.enable_ha()
admin_client.wait_for_ha()
if strategy in ('ha-backup', 'backup'):
backup_file = admin_client.backup()
restore_present_state_server(admin_client, backup_file)
if strategy == 'ha':
leader_only = True
else:
leader_only = False
deleted_machine_ids = delete_controller_members(
admin_client, leader_only=leader_only)
for m_id in deleted_machine_ids:
if bs_manager.known_hosts.get(m_id):
del bs_manager.known_hosts[m_id]
if strategy == 'ha':
client.get_status(600)
else:
restore_missing_state_server(client, admin_client, backup_file)
def main(argv):
args = parse_args(argv)
client = make_client_from_args(args)
jes_enabled = client.is_jes_enabled()
bs_manager = BootstrapManager(
client.env.environment, client, client, None, [], args.series,
agent_url=None, agent_stream=args.agent_stream, region=None,
log_dir=args.logs, keep_env=False, permanent=jes_enabled,
jes_enabled=jes_enabled)
with bs_manager.booted_context(upload_tools=False):
with detect_bootstrap_machine(bs_manager):
assess_recovery(bs_manager, args.strategy, args.charm_prefix)
if __name__ == '__main__':
main(sys.argv[1:])
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