doctor_tests/app_manager/sample.py

   1 ##############################################################################
   2 # Copyright (c) 2018 Nokia Corporation and others.
   3 #
   4 # All rights reserved. This program and the accompanying materials
   5 # are made available under the terms of the Apache License, Version 2.0
   6 # which accompanies this distribution, and is available at
   7 # http://www.apache.org/licenses/LICENSE-2.0
   8 ##############################################################################
   9 from flask import Flask
  10 from flask import request
  11 import json
  12 import yaml
  13 import time
  14 from threading import Thread
  15 import requests
  16
  17 from doctor_tests.app_manager.base import BaseAppManager
  18 from doctor_tests.identity_auth import get_identity_auth
  19 from doctor_tests.identity_auth import get_session
  20 from doctor_tests.os_clients import nova_client
  21
  22
  23 class SampleAppManager(BaseAppManager):
  24
  25     def __init__(self, stack, conf, log):
  26         super(SampleAppManager, self).__init__(conf, log)
  27         self.stack = stack
  28         self.app = None
  29
  30     def start(self):
  31         self.log.info('sample app manager start......')
  32         self.app = AppManager(self.stack, self.conf, self, self.log)
  33         self.app.start()
  34
  35     def stop(self):
  36         self.log.info('sample app manager stop......')
  37         if not self.app:
  38             return
  39         headers = {
  40             'Content-Type': 'application/json',
  41             'Accept': 'application/json',
  42         }
  43         url = 'http://%s:%d/shutdown'\
  44               % (self.conf.app_manager.ip,
  45                  self.conf.app_manager.port)
  46         requests.post(url, data='', headers=headers)
  47
  48
  49 class AppManager(Thread):
  50
  51     def __init__(self, stack, conf, app_manager, log):
  52         Thread.__init__(self)
  53         self.stack = stack
  54         self.conf = conf
  55         self.port = self.conf.app_manager.port
  56         self.app_manager = app_manager
  57         self.log = log
  58         self.intance_ids = None
  59         self.headers = {
  60             'Content-Type': 'application/json',
  61             'Accept': 'application/json'}
  62         self.auth = get_identity_auth(project=self.conf.doctor_project)
  63         self.nova = nova_client(self.conf.nova_version,
  64                                 get_session(auth=self.auth))
  65         self.orig_number_of_instances = self.number_of_instances()
  66         self.ha_instances = self.get_ha_instances()
  67         self.floating_ip = None
  68         self.active_instance_id = self.active_instance_id()
  69
  70     def active_instance_id(self):
  71         for instance in self.ha_instances:
  72             network_interfaces = next(iter(instance.addresses.values()))
  73             for network_interface in network_interfaces:
  74                 _type = network_interface.get('OS-EXT-IPS:type')
  75                 if _type == "floating":
  76                     if not self.floating_ip:
  77                         self.floating_ip = network_interface.get('addr')
  78                     self.log.debug('active_instance: %s %s' %
  79                                    (instance.name, instance.id))
  80                     return instance.id
  81         raise Exception("No active instance found")
  82
  83     def switch_over_ha_instance(self):
  84         for instance in self.ha_instances:
  85             if instance.id != self.active_instance_id:
  86                 self.log.info('Switch over to: %s %s' % (instance.name,
  87                                                          instance.id))
  88                 instance.add_floating_ip(self.floating_ip)
  89                 self.active_instance_id = instance.id
  90                 break
  91
  92     def get_instance_ids(self):
  93         ret = list()
  94         for instance in self.nova.servers.list(detailed=False):
  95             ret.append(instance.id)
  96         return ret
  97
  98     def get_ha_instances(self):
  99         ha_instances = list()
 100         for instance in self.nova.servers.list(detailed=True):
 101             if "doctor_ha_app_" in instance.name:
 102                 ha_instances.append(instance)
 103                 self.log.debug('ha_instances: %s' % instance.name)
 104         return ha_instances
 105
 106     def _alarm_data_decoder(self, data):
 107         if "[" in data or "{" in data:
 108             # string to list or dict removing unicode
 109             data = yaml.load(data.replace("u'", "'"))
 110         return data
 111
 112     def _alarm_traits_decoder(self, data):
 113         return ({str(t[0]): self._alarm_data_decoder(str(t[2]))
 114                 for t in data['reason_data']['event']['traits']})
 115
 116     def get_session_instance_ids(self, url, session_id):
 117         ret = requests.get(url, data=None, headers=self.headers)
 118         if ret.status_code != 200:
 119             raise Exception(ret.text)
 120         self.log.info('get_instance_ids %s' % ret.json())
 121         return ret.json()['instance_ids']
 122
 123     def scale_instances(self, number_of_instances):
 124         number_of_instances_before = self.number_of_instances()
 125
 126         parameters = self.stack.parameters
 127         parameters['nonha_intances'] += number_of_instances
 128         self.stack.update(self.stack.stack_name,
 129                           self.stack.stack_id,
 130                           self.stack.template,
 131                           parameters=parameters,
 132                           files=self.stack.files)
 133
 134         number_of_instances_after = self.number_of_instances()
 135         if (number_of_instances_before + number_of_instances !=
 136            number_of_instances_after):
 137             self.log.error('scale_instances with: %d from: %d ends up to: %d'
 138                            % (number_of_instances, number_of_instances_before,
 139                               number_of_instances_after))
 140             raise Exception('scale_instances failed')
 141
 142         self.log.info('scaled insances from %d to %d' %
 143                       (number_of_instances_before,
 144                        number_of_instances_after))
 145
 146     def number_of_instances(self):
 147         return len(self.nova.servers.list(detailed=False))
 148
 149     def run(self):
 150         app = Flask('app_manager')
 151
 152         @app.route('/maintenance', methods=['POST'])
 153         def maintenance_alarm():
 154             data = json.loads(request.data.decode('utf8'))
 155             try:
 156                 payload = self._alarm_traits_decoder(data)
 157             except:
 158                 payload = ({t[0]: t[2] for t in
 159                            data['reason_data']['event']['traits']})
 160                 self.log.error('cannot parse alarm data: %s' % payload)
 161                 raise Exception('sample app manager cannot parse alarm.'
 162                                 'Possibly trait data over 256 char')
 163
 164             self.log.info('sample app manager received data = %s' % payload)
 165
 166             state = payload['state']
 167             reply_state = None
 168             reply = dict()
 169
 170             self.log.info('sample app manager state: %s' % state)
 171
 172             if state == 'MAINTENANCE':
 173                 instance_ids = (self.get_session_instance_ids(
 174                                 payload['instance_ids'],
 175                                 payload['session_id']))
 176                 reply['instance_ids'] = instance_ids
 177                 reply_state = 'ACK_MAINTENANCE'
 178
 179             elif state == 'SCALE_IN':
 180                 # scale down 2 isntances that is VCPUS equaling to single
 181                 # compute node
 182                 self.scale_instances(-2)
 183                 reply['instance_ids'] = self.get_instance_ids()
 184                 reply_state = 'ACK_SCALE_IN'
 185
 186             elif state == 'MAINTENANCE_COMPLETE':
 187                 # possibly need to upscale
 188                 number_of_instances = self.number_of_instances()
 189                 if self.orig_number_of_instances > number_of_instances:
 190                     scale_instances = (self.orig_number_of_instances -
 191                                        number_of_instances)
 192                     self.scale_instances(scale_instances)
 193                 reply_state = 'ACK_MAINTENANCE_COMPLETE'
 194
 195             elif state == 'PREPARE_MAINTENANCE':
 196                 if "MIGRATE" not in payload['allowed_actions']:
 197                     raise Exception('MIGRATE not supported')
 198
 199                 instance_ids = (self.get_session_instance_ids(
 200                                 payload['instance_ids'],
 201                                 payload['session_id']))
 202                 self.log.info('sample app manager got instances: %s' %
 203                               instance_ids)
 204                 instance_actions = dict()
 205                 for instance_id in instance_ids:
 206                     instance_actions[instance_id] = "MIGRATE"
 207                     if instance_id == self.active_instance_id:
 208                         self.switch_over_ha_instance()
 209                 reply['instance_actions'] = instance_actions
 210                 reply_state = 'ACK_PREPARE_MAINTENANCE'
 211
 212             elif state == 'PLANNED_MAINTENANCE':
 213                 if "MIGRATE" not in payload['allowed_actions']:
 214                     raise Exception('MIGRATE not supported')
 215
 216                 instance_ids = (self.get_session_instance_ids(
 217                                 payload['instance_ids'],
 218                                 payload['session_id']))
 219                 self.log.info('sample app manager got instances: %s' %
 220                               instance_ids)
 221                 instance_actions = dict()
 222                 for instance_id in instance_ids:
 223                     instance_actions[instance_id] = "MIGRATE"
 224                     if instance_id == self.active_instance_id:
 225                         self.switch_over_ha_instance()
 226                 reply['instance_actions'] = instance_actions
 227                 reply_state = 'ACK_PLANNED_MAINTENANCE'
 228
 229             elif state == 'INSTANCE_ACTION_DONE':
 230                 self.log.info('%s' % payload['instance_ids'])
 231
 232             else:
 233                 raise Exception('sample app manager received event with'
 234                                 ' unknown state %s' % state)
 235
 236             if reply_state:
 237                 reply['session_id'] = payload['session_id']
 238                 reply['state'] = reply_state
 239                 url = payload['reply_url']
 240                 self.log.info('sample app manager reply: %s' % reply)
 241                 requests.put(url, data=json.dumps(reply), headers=self.headers)
 242
 243             return 'OK'
 244
 245         @app.route('/shutdown', methods=['POST'])
 246         def shutdown():
 247             self.log.info('shutdown app manager server at %s' % time.time())
 248             func = request.environ.get('werkzeug.server.shutdown')
 249             if func is None:
 250                 raise RuntimeError('Not running with the Werkzeug Server')
 251             func()
 252             return 'app manager shutting down...'
 253
 254         app.run(host="0.0.0.0", port=self.port)