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##############################################################################
# Copyright (c) 2018 Nokia Corporation and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
from flask import Flask
from flask import request
import json
import yaml
import time
from threading import Thread
import requests
from doctor_tests.app_manager.base import BaseAppManager
from doctor_tests.identity_auth import get_identity_auth
from doctor_tests.identity_auth import get_session
from doctor_tests.os_clients import nova_client
class SampleAppManager(BaseAppManager):
def __init__(self, stack, conf, log):
super(SampleAppManager, self).__init__(conf, log)
self.stack = stack
self.app = None
def start(self):
self.log.info('sample app manager start......')
self.app = AppManager(self.stack, self.conf, self, self.log)
self.app.start()
def stop(self):
self.log.info('sample app manager stop......')
if not self.app:
return
headers = {
'Content-Type': 'application/json',
'Accept': 'application/json',
}
url = 'http://%s:%d/shutdown'\
% (self.conf.app_manager.ip,
self.conf.app_manager.port)
requests.post(url, data='', headers=headers)
class AppManager(Thread):
def __init__(self, stack, conf, app_manager, log):
Thread.__init__(self)
self.stack = stack
self.conf = conf
self.port = self.conf.app_manager.port
self.app_manager = app_manager
self.log = log
self.intance_ids = None
self.headers = {
'Content-Type': 'application/json',
'Accept': 'application/json'}
self.auth = get_identity_auth(project=self.conf.doctor_project)
self.nova = nova_client(self.conf.nova_version,
get_session(auth=self.auth))
self.orig_number_of_instances = self.number_of_instances()
self.ha_instances = self.get_ha_instances()
self.floating_ip = None
self.active_instance_id = self.active_instance_id()
def active_instance_id(self):
for instance in self.ha_instances:
network_interfaces = next(iter(instance.addresses.values()))
for network_interface in network_interfaces:
_type = network_interface.get('OS-EXT-IPS:type')
if _type == "floating":
if not self.floating_ip:
self.floating_ip = network_interface.get('addr')
self.log.debug('active_instance: %s %s' %
(instance.name, instance.id))
return instance.id
raise Exception("No active instance found")
def switch_over_ha_instance(self):
for instance in self.ha_instances:
if instance.id != self.active_instance_id:
self.log.info('Switch over to: %s %s' % (instance.name,
instance.id))
instance.add_floating_ip(self.floating_ip)
self.active_instance_id = instance.id
break
def get_instance_ids(self):
ret = list()
for instance in self.nova.servers.list(detailed=False):
ret.append(instance.id)
return ret
def get_ha_instances(self):
ha_instances = list()
for instance in self.nova.servers.list(detailed=True):
if "doctor_ha_app_" in instance.name:
ha_instances.append(instance)
self.log.debug('ha_instances: %s' % instance.name)
return ha_instances
def _alarm_data_decoder(self, data):
if "[" in data or "{" in data:
# string to list or dict removing unicode
data = yaml.load(data.replace("u'", "'"))
return data
def _alarm_traits_decoder(self, data):
return ({str(t[0]): self._alarm_data_decoder(str(t[2]))
for t in data['reason_data']['event']['traits']})
def get_session_instance_ids(self, url, session_id):
ret = requests.get(url, data=None, headers=self.headers)
if ret.status_code != 200:
raise Exception(ret.text)
self.log.info('get_instance_ids %s' % ret.json())
return ret.json()['instance_ids']
def scale_instances(self, number_of_instances):
number_of_instances_before = self.number_of_instances()
parameters = self.stack.parameters
parameters['nonha_intances'] += number_of_instances
self.stack.update(self.stack.stack_name,
self.stack.stack_id,
self.stack.template,
parameters=parameters,
files=self.stack.files)
number_of_instances_after = self.number_of_instances()
if (number_of_instances_before + number_of_instances !=
number_of_instances_after):
self.log.error('scale_instances with: %d from: %d ends up to: %d'
% (number_of_instances, number_of_instances_before,
number_of_instances_after))
raise Exception('scale_instances failed')
self.log.info('scaled insances from %d to %d' %
(number_of_instances_before,
number_of_instances_after))
def number_of_instances(self):
return len(self.nova.servers.list(detailed=False))
def run(self):
app = Flask('app_manager')
@app.route('/maintenance', methods=['POST'])
def maintenance_alarm():
data = json.loads(request.data.decode('utf8'))
try:
payload = self._alarm_traits_decoder(data)
except:
payload = ({t[0]: t[2] for t in
data['reason_data']['event']['traits']})
self.log.error('cannot parse alarm data: %s' % payload)
raise Exception('sample app manager cannot parse alarm.'
'Possibly trait data over 256 char')
self.log.info('sample app manager received data = %s' % payload)
state = payload['state']
reply_state = None
reply = dict()
self.log.info('sample app manager state: %s' % state)
if state == 'MAINTENANCE':
instance_ids = (self.get_session_instance_ids(
payload['instance_ids'],
payload['session_id']))
reply['instance_ids'] = instance_ids
reply_state = 'ACK_MAINTENANCE'
elif state == 'SCALE_IN':
# scale down 2 isntances that is VCPUS equaling to single
# compute node
self.scale_instances(-2)
reply['instance_ids'] = self.get_instance_ids()
reply_state = 'ACK_SCALE_IN'
elif state == 'MAINTENANCE_COMPLETE':
# possibly need to upscale
number_of_instances = self.number_of_instances()
if self.orig_number_of_instances > number_of_instances:
scale_instances = (self.orig_number_of_instances -
number_of_instances)
self.scale_instances(scale_instances)
reply_state = 'ACK_MAINTENANCE_COMPLETE'
elif state == 'PREPARE_MAINTENANCE':
if "MIGRATE" not in payload['allowed_actions']:
raise Exception('MIGRATE not supported')
instance_ids = (self.get_session_instance_ids(
payload['instance_ids'],
payload['session_id']))
self.log.info('sample app manager got instances: %s' %
instance_ids)
instance_actions = dict()
for instance_id in instance_ids:
instance_actions[instance_id] = "MIGRATE"
if instance_id == self.active_instance_id:
self.switch_over_ha_instance()
reply['instance_actions'] = instance_actions
reply_state = 'ACK_PREPARE_MAINTENANCE'
elif state == 'PLANNED_MAINTENANCE':
if "MIGRATE" not in payload['allowed_actions']:
raise Exception('MIGRATE not supported')
instance_ids = (self.get_session_instance_ids(
payload['instance_ids'],
payload['session_id']))
self.log.info('sample app manager got instances: %s' %
instance_ids)
instance_actions = dict()
for instance_id in instance_ids:
instance_actions[instance_id] = "MIGRATE"
if instance_id == self.active_instance_id:
self.switch_over_ha_instance()
reply['instance_actions'] = instance_actions
reply_state = 'ACK_PLANNED_MAINTENANCE'
elif state == 'INSTANCE_ACTION_DONE':
self.log.info('%s' % payload['instance_ids'])
else:
raise Exception('sample app manager received event with'
' unknown state %s' % state)
if reply_state:
reply['session_id'] = payload['session_id']
reply['state'] = reply_state
url = payload['reply_url']
self.log.info('sample app manager reply: %s' % reply)
requests.put(url, data=json.dumps(reply), headers=self.headers)
return 'OK'
@app.route('/shutdown', methods=['POST'])
def shutdown():
self.log.info('shutdown app manager server at %s' % time.time())
func = request.environ.get('werkzeug.server.shutdown')
if func is None:
raise RuntimeError('Not running with the Werkzeug Server')
func()
return 'app manager shutting down...'
app.run(host="0.0.0.0", port=self.port)
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