/usr/lib/python2.7/dist-packages/os_xenapi/client/image/vdi_handler.py is in python-os-xenapi 0.3.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 | # Copyright 2017 Citrix Systems
#
# 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 eventlet
import logging
from six.moves import http_client as httplib
import six.moves.urllib.parse as urlparse
import tarfile
from os_xenapi.client import exception
from os_xenapi.client.image import vhd_utils
from os_xenapi.client import utils
LOG = logging.getLogger(__name__)
CHUNK_SIZE = 4 * 1024 * 1024
class ImageStreamToVDIs(object):
def __init__(self, context, session, instance, host_url, image_stream_in):
self.context = context
self.session = session
self.instance = instance
self.host_url = urlparse.urlparse(host_url)
self.image_stream = image_stream_in
self.task_ref = None
self.vdis = {}
def _clean(self):
if self.task_ref:
self.session.task.destroy(self.task_ref)
def start(self):
label = 'VDI_IMPORT_for_' + self.instance['name']
desc = 'Importing VDI for instance: %s' % self.instance['name']
self.task_ref = self.session.task.create(label, desc)
try:
with tarfile.open(mode="r|gz", fileobj=self.image_stream) as tar:
for vhd in tar:
file_size = vhd.size
LOG.debug("file_name:file_size is %(n)s:%(s)d",
{'n': vhd.name, 's': vhd.size})
vhd_file = tar.extractfile(vhd)
vhd_file_parser = vhd_utils.VHDFileParser(vhd_file)
vhd_footer = vhd_file_parser.parse_vhd_footer()
virtual_size = vhd_footer.current_size
sr_ref, vdi_ref = self._createVDI(self.session,
self.instance,
virtual_size)
self._vhd_stream_to_vdi(vhd_file_parser, vdi_ref,
file_size)
vdi_uuid = self.session.VDI.get_uuid(vdi_ref)
if 'root' in self.vdis.keys():
# we only support single vdi. If 'root' already exists
# in the dict, should raise exception.
msg = "Only support single VDI; but there are " + \
"multiple VDIs in the image."
raise exception.InvalidImage(details=msg)
self.vdis['root'] = dict(uuid=vdi_uuid)
finally:
self._clean()
def _createVDI(self, session, instance, virtual_size):
sr_ref = utils.get_default_sr(session)
vdi_ref = utils.create_vdi(session, sr_ref, instance,
instance['name'], 'root', virtual_size)
vdi_uuid = session.VDI.get_uuid(vdi_ref)
LOG.debug("Created a new VDI: uuid=%s" % vdi_uuid)
return sr_ref, vdi_ref
def _vhd_stream_to_vdi(self, vhd_file_parser, vdi_ref, file_size):
headers = {'Content-Type': 'application/octet-stream',
'Content-Length': '%s' % file_size}
if self.host_url.scheme == 'http':
conn = httplib.HTTPConnection(self.host_url.netloc)
elif self.host_url.scheme == 'https':
conn = httplib.HTTPSConnection(self.host_url.netloc)
vdi_import_path = utils.get_vdi_import_path(
self.session, self.task_ref, vdi_ref)
try:
conn.connect()
except Exception:
LOG.error('Failed connecting to host: %s', self.host_url.netloc)
raise exception.HostConnectionFailure(
host_netloc=self.host_url.netloc)
try:
conn.request('PUT', vdi_import_path, headers=headers)
# Send the data already processed by vhd file parser firstly;
# then send the remaining data from the stream.
conn.send(vhd_file_parser.cached_buff)
remain_size = file_size - len(vhd_file_parser.cached_buff)
file_obj = vhd_file_parser.src_file
while remain_size >= CHUNK_SIZE:
chunk = file_obj.read(CHUNK_SIZE)
remain_size -= CHUNK_SIZE
conn.send(chunk)
if remain_size != 0:
chunk = file_obj.read(remain_size)
conn.send(chunk)
except Exception:
LOG.error('Failed importing VDI from VHD stream - vdi_ref:%s',
vdi_ref)
raise exception.VdiImportFailure(vdi_ref=vdi_ref)
finally:
resp = conn.getresponse()
LOG.debug("Connection response status/reason is "
"%(status)s:%(reason)s",
{'status': resp.status, 'reason': resp.reason})
conn.close()
class GenerateImageStream(object):
def __init__(self, context, session, instance, host_url, vdi_uuids):
self.context = context
self.session = session
self.instance = instance
self.host_url = host_url
self.vdi_uuids = vdi_uuids
def get_image_data(self):
"""This function will:
1). export VDI as VHD stream;
2). make gzipped tarball from the VHD stream;
3). read from the tarball stream.and return the iterable data.
"""
tarpipe_out, tarpipe_in = utils.create_pipe()
pool = eventlet.GreenPool()
pool.spawn(self.start_image_stream_generator, tarpipe_in)
try:
while True:
data = tarpipe_out.read(CHUNK_SIZE)
if not data:
break
yield data
except Exception:
LOG.debug("Failed to read chunks from the tarfile "
"stream.")
raise
finally:
tarpipe_out.close()
pool.waitall()
def start_image_stream_generator(self, tarpipe_in):
tar_generator = VdisToTarStream(
self.context, self.session, self.instance, self.host_url,
self.vdi_uuids, tarpipe_in)
try:
tar_generator.start()
finally:
tarpipe_in.close()
class VdisToTarStream(object):
def __init__(self, context, session, instance, host_url, vdi_uuids,
tarpipe_in):
self.context = context
self.session = session
self.instance = instance
self.host_url = host_url
self.vdi_uuids = vdi_uuids
self.tarpipe_in = tarpipe_in
self.conn = None
self.task_ref = None
def start(self):
# Start thread to generate tgz and write tgz data into tarpipe_in.
with tarfile.open(fileobj=self.tarpipe_in, mode='w|gz') as tar_file:
# only need export the leaf vdi.
vdi_uuid = self.vdi_uuids[0]
vdi_ref = self.session.VDI.get_by_uuid(vdi_uuid)
vhd_stream = self._connect_request(vdi_ref)
tar_info = tarfile.TarInfo('0.vhd')
try:
# the VHD must be dynamical hard disk, otherwise it will raise
# VhdDiskTypeNotSupported exception when parsing VDH file.
vhd_DynDisk = vhd_utils.VHDDynDiskParser(vhd_stream)
tar_info.size = vhd_DynDisk.get_vhd_file_size()
LOG.debug("VHD size for tarfile is %d" % tar_info.size)
vhdpipe_out, vhdpipe_in = utils.create_pipe()
pool = eventlet.GreenPool()
pool.spawn(self.convert_vhd_to_tar, vhdpipe_out,
tar_file, tar_info)
try:
self._vhd_to_pipe(vhd_DynDisk, vhdpipe_in)
finally:
vhdpipe_in.close()
pool.waitall()
finally:
self._clean()
def convert_vhd_to_tar(self, vhdpipe_out, tar_file, tar_info):
tarGenerator = AddVhdToTar(tar_file, tar_info, vhdpipe_out)
try:
tarGenerator.start()
finally:
vhdpipe_out.close()
def _connect_request(self, vdi_ref):
# request connection to xapi url service for VDI export
try:
# create task for VDI export
label = 'VDI_EXPORT_for_' + self.instance['name']
desc = 'Exporting VDI for instance: %s' % self.instance['name']
self.task_ref = self.session.task.create(label, desc)
LOG.debug("task_ref is %s" % self.task_ref)
# connect to XS
xs_url = urlparse.urlparse(self.host_url)
if xs_url.scheme == 'http':
conn = httplib.HTTPConnection(xs_url.netloc)
LOG.debug("using http")
elif xs_url.scheme == 'https':
conn = httplib.HTTPSConnection(xs_url.netloc)
LOG.debug("using https")
vdi_export_path = utils.get_vdi_export_path(
self.session, self.task_ref, vdi_ref)
conn.request('GET', vdi_export_path)
conn_resp = conn.getresponse()
except Exception:
LOG.debug('request connect for vdi export failed')
raise
return conn_resp
def _vhd_to_pipe(self, vhd_dynDisk, vhdpipe_in):
# Firstly write the data already parsed by vhd_dynDisk obj;
# then write all of the remaining data to the pipe also.
vhdpipe_in.write(vhd_dynDisk.cached_buff)
remain_data = vhd_dynDisk.src_file
while True:
data = remain_data.read(CHUNK_SIZE)
if not data:
break
try:
vhdpipe_in.write(data)
except Exception:
LOG.debug("Failed when writing data to VHD stream.")
raise
def _clean(self):
if self.conn:
self.conn.close()
if self.task_ref:
self.session.task.destroy(self.task_ref)
class AddVhdToTar(object):
def __init__(self, tar_file, tar_info, vhdpipe_out):
self.tar_file = tar_file
self.tar_info = tar_info
self.stream = vhdpipe_out
def start(self):
self._add_stream_to_tar()
def _add_stream_to_tar(self):
try:
LOG.debug('self.tar_info.size=%d' % self.tar_info.size)
self.tar_file.addfile(self.tar_info, fileobj=self.stream)
LOG.debug('added file %s' % self.tar_info.name)
except IOError:
LOG.debug('IOError when streaming vhd to tarball')
raise
|