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# Copyright (c) 2016 Cable Television Laboratories, Inc. ("CableLabs")
# and others. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import time
from glanceclient.exc import HTTPNotFound
from snaps.openstack.utils import glance_utils, nova_utils
__author__ = 'spisarski'
logger = logging.getLogger('create_image')
IMAGE_ACTIVE_TIMEOUT = 600
POLL_INTERVAL = 3
STATUS_ACTIVE = 'active'
class OpenStackImage:
"""
Class responsible for creating an image in OpenStack
"""
def __init__(self, os_creds, image_settings):
"""
Constructor
:param os_creds: The OpenStack connection credentials
:param image_settings: The image settings
:return:
"""
self.__os_creds = os_creds
self.image_settings = image_settings
self.__image = None
self.__glance = glance_utils.glance_client(os_creds)
def create(self, cleanup=False):
"""
Creates the image in OpenStack if it does not already exist
:param cleanup: Denotes whether or not this is being called for cleanup or not
:return: The OpenStack Image object
"""
from snaps.openstack.utils import nova_utils
nova = nova_utils.nova_client(self.__os_creds)
self.__image = glance_utils.get_image(nova, self.__glance, self.image_settings.name)
if self.__image:
logger.info('Found image with name - ' + self.image_settings.name)
return self.__image
elif not cleanup:
self.__image = glance_utils.create_image(self.__glance, self.image_settings)
logger.info('Creating image')
if self.image_active(block=True):
logger.info('Image is now active with name - ' + self.image_settings.name)
return self.__image
else:
raise Exception('Image did not activate in the alloted amount of time')
else:
logger.info('Did not create image due to cleanup mode')
return self.__image
def clean(self):
"""
Cleanse environment of all artifacts
:return: void
"""
if self.__image:
try:
glance_utils.delete_image(self.__glance, self.__image)
except HTTPNotFound:
pass
self.__image = None
def get_image(self):
"""
Returns the OpenStack image object as it was populated when create() was called
:return: the object
"""
return self.__image
def image_active(self, block=False, timeout=IMAGE_ACTIVE_TIMEOUT, poll_interval=POLL_INTERVAL):
"""
Returns true when the image status returns the value of expected_status_code
:param block: When true, thread will block until active or timeout value in seconds has been exceeded (False)
:param timeout: The timeout value
:param poll_interval: The polling interval in seconds
:return: T/F
"""
return self._image_status_check(STATUS_ACTIVE, block, timeout, poll_interval)
def _image_status_check(self, expected_status_code, block, timeout, poll_interval):
"""
Returns true when the image status returns the value of expected_status_code
:param expected_status_code: instance status evaluated with this string value
:param block: When true, thread will block until active or timeout value in seconds has been exceeded (False)
:param timeout: The timeout value
:param poll_interval: The polling interval in seconds
:return: T/F
"""
# sleep and wait for image status change
if block:
start = time.time()
else:
start = time.time() - timeout
while timeout > time.time() - start:
status = self._status(expected_status_code)
if status:
logger.info('Image is active with name - ' + self.image_settings.name)
return True
logger.debug('Retry querying image status in ' + str(poll_interval) + ' seconds')
time.sleep(poll_interval)
logger.debug('Image status query timeout in ' + str(timeout - (time.time() - start)))
logger.error('Timeout checking for image status for ' + expected_status_code)
return False
def _status(self, expected_status_code):
"""
Returns True when active else False
:param expected_status_code: instance status evaluated with this string value
:return: T/F
"""
# TODO - Place this API call into glance_utils.
nova = nova_utils.nova_client(self.__os_creds)
instance = glance_utils.get_image(nova, self.__glance, self.image_settings.name)
# instance = self.__glance.images.get(self.__image)
if not instance:
logger.warn('Cannot find instance with id - ' + self.__image.id)
return False
if instance.status == 'ERROR':
raise Exception('Instance had an error during deployment')
logger.debug('Instance status is - ' + instance.status)
return instance.status == expected_status_code
class ImageSettings:
def __init__(self, config=None, name=None, image_user=None, img_format=None, url=None, image_file=None,
extra_properties=None, nic_config_pb_loc=None):
"""
:param config: dict() object containing the configuration settings using the attribute names below as each
member's the key and overrides any of the other parameters.
:param name: the image's name (required)
:param image_user: the image's default sudo user (required)
:param img_format: the image type (required)
:param url: the image download location (requires url or img_file)
:param image_file: the image file location (requires url or img_file)
:param extra_properties: dict() object containing extra parameters to pass when loading the image;
can be ids of kernel and initramfs images for a 3-part image
:param nic_config_pb_loc: the file location to the Ansible Playbook that can configure multiple NICs
"""
if config:
self.name = config.get('name')
self.image_user = config.get('image_user')
self.format = config.get('format')
self.url = config.get('download_url')
self.image_file = config.get('image_file')
self.extra_properties = config.get('extra_properties')
self.nic_config_pb_loc = config.get('nic_config_pb_loc')
else:
self.name = name
self.image_user = image_user
self.format = img_format
self.url = url
self.image_file = image_file
self.extra_properties = extra_properties
self.nic_config_pb_loc = nic_config_pb_loc
if not self.name or not self.image_user or not self.format:
raise Exception("The attributes name, image_user, format, and url are required for ImageSettings")
if not self.url and not self.image_file:
raise Exception('URL or image file must be set')
if self.url and self.image_file:
raise Exception('Please set either URL or image file, not both')
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