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##############################################################################
# Copyright (c) 2016 Huawei Technologies Co.,Ltd 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
##############################################################################
"""Heat template and stack management,
This file could manage stack include the function:
create stack delete stack and so on"""
import time
import sys
import logging
from heatclient import client as heatclient
import common as op_utils
log = logging.getLogger(__name__)
class HeatObject(object):
''' base class for template and stack'''
def __init__(self):
self._heat_client = None
self.uuid = None
def _get_heat_client(self):
'''returns a heat client instance'''
if self._heat_client is None:
sess = op_utils.get_session()
heat_endpoint = op_utils.get_endpoint(service_type='orchestration')
self._heat_client = heatclient.Client(
op_utils.get_heat_api_version(),
endpoint=heat_endpoint, session=sess)
return self._heat_client
def status(self):
'''returns stack state as a string'''
heat = self._get_heat_client()
stack = heat.stacks.get(self.uuid)
return getattr(stack, 'stack_status')
class HeatStack(HeatObject):
''' Represents a Heat stack (deployed template) '''
stacks = []
def __init__(self, name):
super(HeatStack, self).__init__()
self.uuid = None
self.name = name
self.outputs = None
HeatStack.stacks.append(self)
@staticmethod
def stacks_exist():
'''check if any stack has been deployed'''
return len(HeatStack.stacks) > 0
def _delete(self):
'''deletes a stack from the target cloud using heat'''
if self.uuid is None:
return
log.info("Deleting stack '%s', uuid:%s", self.name, self.uuid)
heat = self._get_heat_client()
template = heat.stacks.get(self.uuid)
start_time = time.time()
template.delete()
status = self.status()
while status != u'DELETE_COMPLETE':
log.debug("stack state %s", status)
if status == u'DELETE_FAILED':
raise RuntimeError(
heat.stacks.get(self.uuid).stack_status_reason)
time.sleep(2)
status = self.status()
end_time = time.time()
log.info("Deleted stack '%s' in %d secs", self.name,
end_time - start_time)
self.uuid = None
def delete(self, block=True, retries=3):
'''deletes a stack in the target cloud using heat (with retry)
Sometimes delete fail with "InternalServerError" and the next attempt
succeeds. So it is worthwhile to test a couple of times.
'''
if self.uuid is None:
return
if not block:
try:
self._delete()
except RuntimeError as err:
log.warn(err.args)
HeatStack.stacks.remove(self)
return
i = 0
while i < retries:
try:
self._delete()
break
except RuntimeError as err:
log.warn(err.args)
time.sleep(2)
i += 1
if self.uuid is not None:
sys.exit("delete stack failed!!!")
else:
HeatStack.stacks.remove(self)
@staticmethod
def delete_all():
for stack in HeatStack.stacks[:]:
stack.delete()
def update(self):
'''update a stack'''
pass
class HeatTemplate(HeatObject):
'''Describes a Heat template and a method to deploy template to a stack'''
def __init__(self,
name,
template_file=None,
heat_parameters=None,
heat_template=None):
super(HeatTemplate, self).__init__()
self.name = name
self.state = "NOT_CREATED"
self.keystone_client = None
self.heat_client = None
self.heat_parameters = {}
# heat_parameters is passed to heat in stack create, empty dict when
# yardstick creates the template (no get_param in resources part)
if heat_parameters:
self.heat_parameters = heat_parameters
if template_file:
with open(template_file) as template:
print "Parsing external template:", template_file
template_str = template.read()
self._template = template_str
self._parameters = heat_parameters
else:
if heat_template:
self._template = heat_template
else:
sys.exit("can't init template file!")
# holds results of requested output after deployment
self.outputs = {}
log.debug("template object '%s' created", name)
def create(self, block=True):
'''creates a template in the target cloud using heat
returns a dict with the requested output values from the template'''
log.info("Creating stack '%s'", self.name)
# create stack early to support cleanup, e.g. ctrl-c while waiting
stack = HeatStack(self.name)
heat = self._get_heat_client()
end_time = start_time = time.time()
print(self._template)
stack.uuid = self.uuid = heat.stacks.create(
stack_name=self.name, template=self._template,
parameters=self.heat_parameters)['stack']['id']
status = self.status()
if block:
while status != u'CREATE_COMPLETE':
log.debug("stack state %s", status)
if status == u'CREATE_FAILED':
raise RuntimeError(getattr(heat.stacks.get(self.uuid),
'stack_status_reason'))
time.sleep(2)
status = self.status()
end_time = time.time()
outputs = getattr(heat.stacks.get(self.uuid), 'outputs')
for output in outputs:
self.outputs[output["output_key"].encode("ascii")] = \
output["output_value"].encode("ascii")
log.info("Created stack '%s' in %d secs",
self.name, end_time - start_time)
stack.outputs = self.outputs
return stack
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