############################################################################## # 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)