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api_ship.py
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api_ship.py
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import json
import logging
import os
import time
import xmlrpclib
from socket import gethostname
import api_base
import consul_config
from armada_backend.utils import deregister_services, set_ship_name, get_logger
from armada_command import armada_api
from armada_command.consul.consul import consul_query, consul_put
from runtime_settings import override_runtime_settings
from utils import get_ship_name, get_other_ship_ips, get_current_datacenter
def _get_current_consul_mode():
with open(consul_config.CONFIG_PATH) as consul_config_json:
consul_config_data = json.load(consul_config_json)
if consul_config_data.get('bootstrap_expect'):
if _get_armada_size() > 1:
return consul_config.ConsulMode.SERVER
else:
return consul_config.ConsulMode.BOOTSTRAP
if consul_config_data.get('server'):
return consul_config.ConsulMode.SERVER
return consul_config.ConsulMode.CLIENT
def _get_armada_size():
try:
catalog_nodes_dict = consul_query('catalog/nodes')
return len(catalog_nodes_dict)
except:
return 0
def wait_for_consul_ready(timeout_seconds=60):
timeout_expiration = time.time() + timeout_seconds
last_exception = None
while time.time() < timeout_expiration:
time.sleep(1)
try:
params = {'local': 'true', 'microservice_name': 'armada'}
armada_instances = armada_api.get_json('list', params)
if armada_instances[0]['status'] == 'passing':
return True
except Exception as e:
last_exception = e
if last_exception:
logging.exception(last_exception)
return False
def _restart_consul():
# Services will be registered again by their script 'register_in_service_discovery'.
agent_self_dict = consul_query('agent/self')
node_name = agent_self_dict['Config']['NodeName']
request_body = json.dumps({'Node': node_name})
consul_put('catalog/deregister', data=request_body)
os.system('consul leave')
return wait_for_consul_ready()
class Name(api_base.ApiCommand):
def GET(self):
return get_ship_name()
def POST(self):
ship_name, error = self.get_post_parameter('name')
if error:
return self.status_error(error)
if not ship_name or ship_name == 'None':
return self.status_error('Incorrect ship name: {}'.format(ship_name))
set_ship_name(ship_name)
return self.status_ok()
class Join(api_base.ApiCommand):
def POST(self):
consul_host, error = self.get_post_parameter('host')
if error:
return self.status_error(error)
armada_size = _get_armada_size()
if armada_size > 1:
return self.status_error('Currently only single ship armadas can join the others. '
'Your armada has size: {0}.'.format(armada_size))
try:
agent_self_dict = consul_query('agent/self', consul_address='{0}:8500'.format(consul_host))
datacenter = agent_self_dict['Config']['Datacenter']
except:
return self.status_error('Could not read remote host datacenter address.')
current_consul_mode = _get_current_consul_mode()
if current_consul_mode == consul_config.ConsulMode.BOOTSTRAP:
override_runtime_settings(consul_mode=consul_config.ConsulMode.CLIENT,
ship_ips=[consul_host],
datacenter=datacenter)
else:
override_runtime_settings(ship_ips=[consul_host] + get_other_ship_ips(),
datacenter=datacenter)
if _restart_consul():
supervisor_server = xmlrpclib.Server('http://localhost:9001/RPC2')
hermes_init_output = supervisor_server.supervisor.startProcessGroup('hermes_init')
get_logger().info('hermes_init start: {}'.format(hermes_init_output))
return self.status_ok()
return self.status_error('Waiting for armada restart timed out.')
class Promote(api_base.ApiCommand):
def POST(self):
current_consul_mode = _get_current_consul_mode()
if current_consul_mode == consul_config.ConsulMode.SERVER:
return self.status_ok({'message': 'Ship is already in server mode.'})
if current_consul_mode == consul_config.ConsulMode.BOOTSTRAP:
return self.status_error('Ship must join armada to be promoted to server.')
override_runtime_settings(consul_mode=consul_config.ConsulMode.SERVER)
if _restart_consul():
return self.status_ok()
return self.status_error('Waiting for armada restart timed out.')
class Shutdown(api_base.ApiCommand):
def POST(self):
# 'startsecs=0' is to avoid restarting consul after `consul leave`.
os.system('sed -i \'/autorestart=true/cautorestart=false\' /etc/supervisor/conf.d/consul.conf')
os.system('echo startsecs=0 >> /etc/supervisor/conf.d/consul.conf')
os.system('supervisorctl update consul')
# As 'supervisorctl update' will restart Consul, we have to wait for it to be running.
while True:
try:
get_current_datacenter()
break
except:
pass
deregister_services(gethostname())
os.system('consul leave')
return self.status_ok({'message': 'Shutdown complete.'})