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         data = {'session_id': session_id}
 118         ret = requests.get(url, data=json.dumps(data), headers=self.headers)
 119         if ret.status_code != 200:
 120             raise Exception(ret.text)
 121         self.log.info('get_instance_ids %s' % ret.json())
 122         return ret.json()['instance_ids']
 123
 124     def scale_instances(self, number_of_instances):
 125         number_of_instances_before = self.number_of_instances()
 126
 127         parameters = self.stack.parameters
 128         parameters['nonha_intances'] += number_of_instances
 129         self.stack.update(self.stack.stack_name,
 130                           self.stack.stack_id,
 131                           self.stack.template,
 132                           parameters=parameters,
 133                           files=self.stack.files)
 134
 135         number_of_instances_after = self.number_of_instances()
 136         if (number_of_instances_before + number_of_instances !=
 137            number_of_instances_after):
 138             self.log.error('scale_instances with: %d from: %d ends up to: %d'
 139                            % (number_of_instances, number_of_instances_before,
 140                               number_of_instances_after))
 141             raise Exception('scale_instances failed')
 142
 143         self.log.info('scaled insances from %d to %d' %
 144                       (number_of_instances_before,
 145                        number_of_instances_after))
 146
 147     def number_of_instances(self):
 148         return len(self.nova.servers.list(detailed=False))
 149
 150     def run(self):
 151         app = Flask('app_manager')
 152
 153         @app.route('/maintenance', methods=['POST'])
 154         def maintenance_alarm():
 155             data = json.loads(request.data.decode('utf8'))
 156             try:
 157                 payload = self._alarm_traits_decoder(data)
 158             except:
 159                 payload = ({t[0]: t[2] for t in
 160                            data['reason_data']['event']['traits']})
 161                 self.log.error('cannot parse alarm data: %s' % payload)
 162                 raise Exception('sample app manager cannot parse alarm.'
 163                                 'Possibly trait data over 256 char')
 164
 165             self.log.info('sample app manager received data = %s' % payload)
 166
 167             state = payload['state']
 168             reply_state = None
 169             reply = dict()
 170
 171             self.log.info('sample app manager state: %s' % state)
 172
 173             if state == 'MAINTENANCE':
 174                 instance_ids = (self.get_session_instance_ids(
 175                                 payload['instance_ids'],
 176                                 payload['session_id']))
 177                 reply['instance_ids'] = instance_ids
 178                 reply_state = 'ACK_MAINTENANCE'
 179
 180             elif state == 'DOWN_SCALE':
 181                 # scale down 2 isntances that is VCPUS equaling to single
 182                 # compute node
 183                 self.scale_instances(-2)
 184                 reply['instance_ids'] = self.get_instance_ids()
 185                 reply_state = 'ACK_DOWN_SCALE'
 186
 187             elif state == 'MAINTENANCE_COMPLETE':
 188                 # possibly need to upscale
 189                 number_of_instances = self.number_of_instances()
 190                 if self.orig_number_of_instances > number_of_instances:
 191                     scale_instances = (self.orig_number_of_instances -
 192                                        number_of_instances)
 193                     self.scale_instances(scale_instances)
 194                 reply_state = 'ACK_MAINTENANCE_COMPLETE'
 195
 196             elif state == 'PREPARE_MAINTENANCE':
 197                 if "MIGRATE" not in payload['allowed_actions']:
 198                     raise Exception('MIGRATE not supported')
 199
 200                 instance_ids = (self.get_session_instance_ids(
 201                                 payload['instance_ids'],
 202                                 payload['session_id']))
 203                 self.log.info('sample app manager got instances: %s' %
 204                               instance_ids)
 205                 instance_actions = dict()
 206                 for instance_id in instance_ids:
 207                     instance_actions[instance_id] = "MIGRATE"
 208                     if instance_id == self.active_instance_id:
 209                         self.switch_over_ha_instance()
 210                 reply['instance_actions'] = instance_actions
 211                 reply_state = 'ACK_PREPARE_MAINTENANCE'
 212
 213             elif state == 'PLANNED_MAINTENANCE':
 214                 if "MIGRATE" not in payload['allowed_actions']:
 215                     raise Exception('MIGRATE not supported')
 216
 217                 instance_ids = (self.get_session_instance_ids(
 218                                 payload['instance_ids'],
 219                                 payload['session_id']))
 220                 self.log.info('sample app manager got instances: %s' %
 221                               instance_ids)
 222                 instance_actions = dict()
 223                 for instance_id in instance_ids:
 224                     instance_actions[instance_id] = "MIGRATE"
 225                     if instance_id == self.active_instance_id:
 226                         self.switch_over_ha_instance()
 227                 reply['instance_actions'] = instance_actions
 228                 reply_state = 'ACK_PLANNED_MAINTENANCE'
 229
 230             elif state == 'INSTANCE_ACTION_DONE':
 231                 self.log.info('%s' % payload['instance_ids'])
 232
 233             else:
 234                 raise Exception('sample app manager received event with'
 235                                 ' unknown state %s' % state)
 236
 237             if reply_state:
 238                 reply['session_id'] = payload['session_id']
 239                 reply['state'] = reply_state
 240                 url = payload['reply_url']
 241                 self.log.info('sample app manager reply: %s' % reply)
 242                 requests.put(url, data=json.dumps(reply), headers=self.headers)
 243
 244             return 'OK'
 245
 246         @app.route('/shutdown', methods=['POST'])
 247         def shutdown():
 248             self.log.info('shutdown app manager server at %s' % time.time())
 249             func = request.environ.get('werkzeug.server.shutdown')
 250             if func is None:
 251                 raise RuntimeError('Not running with the Werkzeug Server')
 252             func()
 253             return 'app manager shutting down...'
 254
 255         app.run(host="0.0.0.0", port=self.port)