snaps/openstack/utils/glance_utils.py

   1 # Copyright (c) 2017 Cable Television Laboratories, Inc. ("CableLabs")
   2 #                    and others.  All rights reserved.
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at:
   7 #
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 import logging
  16 import os
  17 import uuid
  18
  19 from snaps import file_utils
  20 from glanceclient.client import Client
  21
  22 from snaps.domain.image import Image
  23 from snaps.openstack.utils import keystone_utils
  24
  25 __author__ = 'spisarski'
  26
  27 logger = logging.getLogger('glance_utils')
  28
  29 VERSION_1 = 1.0
  30 VERSION_2 = 2.0
  31
  32 """
  33 Utilities for basic neutron API calls
  34 """
  35
  36
  37 def glance_client(os_creds):
  38     """
  39     Creates and returns a glance client object
  40     :return: the glance client
  41     """
  42     return Client(version=os_creds.image_api_version, session=keystone_utils.keystone_session(os_creds))
  43
  44
  45 def get_image(glance, image_name=None):
  46     """
  47     Returns an OpenStack image object for a given name
  48     :param glance: the Glance client
  49     :param image_name: the image name to lookup
  50     :return: the image object or None
  51     """
  52     images = glance.images.list()
  53     for image in images:
  54         if glance.version == VERSION_1:
  55             if image.name == image_name:
  56                 image = glance.images.get(image.id)
  57                 return Image(name=image.name, image_id=image.id, size=image.size, properties=image.properties)
  58         elif glance.version == VERSION_2:
  59             if image['name'] == image_name:
  60                 return Image(name=image['name'], image_id=image['id'], size=image['size'],
  61                              properties=image.get('properties'))
  62     return None
  63
  64
  65 def get_image_status(glance, image):
  66     """
  67     Returns a new OpenStack Image object for a given OpenStack image object
  68     :param glance: the Glance client
  69     :param image: the domain Image object
  70     :return: the OpenStack Image object
  71     """
  72     if glance.version == VERSION_1:
  73         os_image = glance.images.get(image.id)
  74         return os_image.status
  75     elif glance.version == VERSION_2:
  76         os_image = glance.images.get(image.id)
  77         return os_image['status']
  78     else:
  79         raise Exception('Unsupported glance client version')
  80
  81
  82 def create_image(glance, image_settings):
  83     """
  84     Creates and returns OpenStack image object with an external URL
  85     :param glance: the glance client
  86     :param image_settings: the image settings object
  87     :return: the OpenStack image object
  88     :raise Exception if using a file and it cannot be found
  89     """
  90     if glance.version == VERSION_1:
  91         return __create_image_v1(glance, image_settings)
  92     elif glance.version == VERSION_2:
  93         return __create_image_v2(glance, image_settings)
  94     else:
  95         raise Exception('Unsupported glance client version')
  96
  97
  98 def __create_image_v1(glance, image_settings):
  99     """
 100     Creates and returns OpenStack image object with an external URL
 101     :param glance: the glance client
 102     :param image_settings: the image settings object
 103     :return: the OpenStack image object
 104     :raise Exception if using a file and it cannot be found
 105     """
 106     created_image = None
 107
 108     if image_settings.url:
 109         if image_settings.extra_properties:
 110             created_image = glance.images.create(
 111                 name=image_settings.name, disk_format=image_settings.format, container_format="bare",
 112                 location=image_settings.url, properties=image_settings.extra_properties)
 113         else:
 114             created_image = glance.images.create(name=image_settings.name, disk_format=image_settings.format,
 115                                                  container_format="bare", location=image_settings.url)
 116     elif image_settings.image_file:
 117         image_file = file_utils.get_file(image_settings.image_file)
 118         if image_settings.extra_properties:
 119             created_image = glance.images.create(
 120                 name=image_settings.name, disk_format=image_settings.format, container_format="bare", data=image_file,
 121                 properties=image_settings.extra_properties)
 122         else:
 123             created_image = glance.images.create(
 124                 name=image_settings.name, disk_format=image_settings.format, container_format="bare", data=image_file)
 125
 126     return Image(name=image_settings.name, image_id=created_image.id, size=created_image.size,
 127                  properties=created_image.properties)
 128
 129
 130 def __create_image_v2(glance, image_settings):
 131     """
 132     Creates and returns OpenStack image object with an external URL
 133     :param glance: the glance client v2
 134     :param image_settings: the image settings object
 135     :return: the OpenStack image object
 136     :raise Exception if using a file and it cannot be found
 137     """
 138     cleanup_file = False
 139     if image_settings.image_file:
 140         image_filename = image_settings.image_file
 141     elif image_settings.url:
 142         image_file = file_utils.download(image_settings.url, '/tmp', str(uuid.uuid4()))
 143         image_filename = image_file.name
 144         cleanup_file = True
 145     else:
 146         raise Exception('Filename or URL of image not configured')
 147
 148     created_image = None
 149     try:
 150         kwargs = dict()
 151         kwargs['name'] = image_settings.name
 152         kwargs['disk_format'] = image_settings.format
 153         kwargs['container_format'] = 'bare'
 154
 155         if image_settings.extra_properties:
 156             for key, value in image_settings.extra_properties.iteritems():
 157                 kwargs[key] = value
 158
 159         created_image = glance.images.create(**kwargs)
 160         image_file = file_utils.get_file(image_filename)
 161         glance.images.upload(created_image['id'], image_file)
 162     except Exception as e:
 163         logger.error('Unexpected exception creating image. Rolling back')
 164         if created_image:
 165             delete_image(glance, created_image)
 166             raise e
 167     finally:
 168         if cleanup_file:
 169             os.remove(image_filename)
 170
 171     updated_image = glance.images.get(created_image['id'])
 172     return Image(name=updated_image['name'], image_id=updated_image['id'], size=updated_image['size'],
 173                  properties=updated_image.get('properties'))
 174
 175
 176 def delete_image(glance, image):
 177     """
 178     Deletes an image from OpenStack
 179     :param glance: the glance client
 180     :param image: the image to delete
 181     """
 182     if glance.version == VERSION_1:
 183         glance.images.delete(image)
 184     elif glance.version == VERSION_2:
 185         glance.images.delete(image.id)
 186     else:
 187         raise Exception('Unsupported glance client version')