2b97fb50c1
This is to support streaming VHD tgz files to/from XAPI. In this way, it will avoid the restriction that SRs must be file system based SR (e.g. ext and nfs) for XenServer OpenStack. So that we can support other types of SRs e.g. lvm, iscsi and etc. Change-Id: I2cfe7340d48071bf96bc7ba0ad19f5a0b12b5378
283 lines
11 KiB
Python
283 lines
11 KiB
Python
# Copyright 2017 Citrix Systems
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import eventlet
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import logging
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from six.moves import http_client as httplib
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import six.moves.urllib.parse as urlparse
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import tarfile
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from os_xenapi.client import exception
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from os_xenapi.client.image import vhd_utils
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from os_xenapi.client import utils
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LOG = logging.getLogger(__name__)
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CHUNK_SIZE = 4 * 1024 * 1024
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class ImageStreamToVDIs(object):
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def __init__(self, context, session, instance, host_url, image_stream_in):
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self.context = context
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self.session = session
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self.instance = instance
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self.host_url = urlparse.urlparse(host_url)
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self.image_stream = image_stream_in
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self.task_ref = None
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self.vdis = {}
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def _clean(self):
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if self.task_ref:
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self.session.task.destroy(self.task_ref)
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def start(self):
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label = 'VDI_IMPORT_for_' + self.instance['name']
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desc = 'Importing VDI for instance: %s' % self.instance['name']
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self.task_ref = self.session.task.create(label, desc)
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try:
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with tarfile.open(mode="r|gz", fileobj=self.image_stream) as tar:
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for vhd in tar:
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file_size = vhd.size
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LOG.debug("file_name:file_size is %(n)s:%(s)d",
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{'n': vhd.name, 's': vhd.size})
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vhd_file = tar.extractfile(vhd)
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vhd_file_parser = vhd_utils.VHDFileParser(vhd_file)
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vhd_footer = vhd_file_parser.parse_vhd_footer()
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virtual_size = vhd_footer.current_size
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sr_ref, vdi_ref = self._createVDI(self.session,
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self.instance,
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virtual_size)
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self._vhd_stream_to_vdi(vhd_file_parser, vdi_ref,
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file_size)
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vdi_uuid = self.session.VDI.get_uuid(vdi_ref)
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if 'root' in self.vdis.keys():
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# we only support single vdi. If 'root' already exists
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# in the dict, should raise exception.
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msg = "Only support single VDI; but there are " + \
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"multiple VDIs in the image."
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raise exception.InvalidImage(details=msg)
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self.vdis['root'] = dict(uuid=vdi_uuid)
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finally:
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self._clean()
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def _createVDI(self, session, instance, virtual_size):
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sr_ref = utils.get_default_sr(session)
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vdi_ref = utils.create_vdi(session, sr_ref, instance,
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instance['name'], 'root', virtual_size)
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vdi_uuid = session.VDI.get_uuid(vdi_ref)
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LOG.debug("Created a new VDI: uuid=%s" % vdi_uuid)
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return sr_ref, vdi_ref
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def _vhd_stream_to_vdi(self, vhd_file_parser, vdi_ref, file_size):
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headers = {'Content-Type': 'application/octet-stream',
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'Content-Length': '%s' % file_size}
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if self.host_url.scheme == 'http':
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conn = httplib.HTTPConnection(self.host_url.netloc)
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elif self.host_url.scheme == 'https':
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conn = httplib.HTTPSConnection(self.host_url.netloc)
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vdi_import_path = utils.get_vdi_import_path(
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self.session, self.task_ref, vdi_ref)
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try:
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conn.connect()
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except Exception:
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LOG.error('Failed connecting to host: %s', self.host_url.netloc)
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raise exception.HostConnectionFailure(
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host_netloc=self.host_url.netloc)
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try:
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conn.request('PUT', vdi_import_path, headers=headers)
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# Send the data already processed by vhd file parser firstly;
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# then send the remaining data from the stream.
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conn.send(vhd_file_parser.cached_buff)
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remain_size = file_size - len(vhd_file_parser.cached_buff)
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file_obj = vhd_file_parser.src_file
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while remain_size >= CHUNK_SIZE:
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chunk = file_obj.read(CHUNK_SIZE)
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remain_size -= CHUNK_SIZE
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conn.send(chunk)
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if remain_size != 0:
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chunk = file_obj.read(remain_size)
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conn.send(chunk)
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except Exception:
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LOG.error('Failed importing VDI from VHD stream - vdi_ref:%s',
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vdi_ref)
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raise exception.VdiImportFailure(vdi_ref=vdi_ref)
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finally:
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resp = conn.getresponse()
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LOG.debug("Connection response status/reason is "
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"%(status)s:%(reason)s",
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{'status': resp.status, 'reason': resp.reason})
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conn.close()
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class GenerateImageStream(object):
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def __init__(self, context, session, instance, host_url, vdi_uuids):
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self.context = context
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self.session = session
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self.instance = instance
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self.host_url = host_url
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self.vdi_uuids = vdi_uuids
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def get_image_data(self):
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"""This function will:
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1). export VDI as VHD stream;
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2). make gzipped tarball from the VHD stream;
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3). read from the tarball stream.and return the iterable data.
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"""
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tarpipe_out, tarpipe_in = utils.create_pipe()
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pool = eventlet.GreenPool()
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pool.spawn(self.start_image_stream_generator, tarpipe_in)
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try:
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while True:
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data = tarpipe_out.read(CHUNK_SIZE)
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if not data:
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break
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yield data
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except Exception:
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LOG.debug("Failed to read chunks from the tarfile "
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"stream.")
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raise
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finally:
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tarpipe_out.close()
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pool.waitall()
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def start_image_stream_generator(self, tarpipe_in):
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tar_generator = VdisToTarStream(
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self.context, self.session, self.instance, self.host_url,
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self.vdi_uuids, tarpipe_in)
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try:
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tar_generator.start()
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finally:
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tarpipe_in.close()
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class VdisToTarStream(object):
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def __init__(self, context, session, instance, host_url, vdi_uuids,
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tarpipe_in):
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self.context = context
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self.session = session
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self.instance = instance
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self.host_url = host_url
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self.vdi_uuids = vdi_uuids
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self.tarpipe_in = tarpipe_in
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self.conn = None
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self.task_ref = None
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def start(self):
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# Start thread to generate tgz and write tgz data into tarpipe_in.
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with tarfile.open(fileobj=self.tarpipe_in, mode='w|gz') as tar_file:
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# only need export the leaf vdi.
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vdi_uuid = self.vdi_uuids[0]
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vdi_ref = self.session.VDI.get_by_uuid(vdi_uuid)
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vhd_stream = self._connect_request(vdi_ref)
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tar_info = tarfile.TarInfo('0.vhd')
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try:
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# the VHD must be dynamical hard disk, otherwise it will raise
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# VhdDiskTypeNotSupported exception when parsing VDH file.
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vhd_DynDisk = vhd_utils.VHDDynDiskParser(vhd_stream)
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tar_info.size = vhd_DynDisk.get_vhd_file_size()
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LOG.debug("VHD size for tarfile is %d" % tar_info.size)
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vhdpipe_out, vhdpipe_in = utils.create_pipe()
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pool = eventlet.GreenPool()
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pool.spawn(self.convert_vhd_to_tar, vhdpipe_out,
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tar_file, tar_info)
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try:
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self._vhd_to_pipe(vhd_DynDisk, vhdpipe_in)
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finally:
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vhdpipe_in.close()
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pool.waitall()
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finally:
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self._clean()
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def convert_vhd_to_tar(self, vhdpipe_out, tar_file, tar_info):
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tarGenerator = AddVhdToTar(tar_file, tar_info, vhdpipe_out)
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try:
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tarGenerator.start()
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finally:
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vhdpipe_out.close()
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def _connect_request(self, vdi_ref):
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# request connection to xapi url service for VDI export
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try:
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# create task for VDI export
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label = 'VDI_EXPORT_for_' + self.instance['name']
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desc = 'Exporting VDI for instance: %s' % self.instance['name']
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self.task_ref = self.session.task.create(label, desc)
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LOG.debug("task_ref is %s" % self.task_ref)
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# connect to XS
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xs_url = urlparse.urlparse(self.host_url)
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if xs_url.scheme == 'http':
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conn = httplib.HTTPConnection(xs_url.netloc)
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LOG.debug("using http")
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elif xs_url.scheme == 'https':
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conn = httplib.HTTPSConnection(xs_url.netloc)
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LOG.debug("using https")
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vdi_export_path = utils.get_vdi_export_path(
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self.session, self.task_ref, vdi_ref)
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conn.request('GET', vdi_export_path)
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conn_resp = conn.getresponse()
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except Exception:
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LOG.debug('request connect for vdi export failed')
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raise
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return conn_resp
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def _vhd_to_pipe(self, vhd_dynDisk, vhdpipe_in):
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# Firstly write the data already parsed by vhd_dynDisk obj;
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# then write all of the remaining data to the pipe also.
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vhdpipe_in.write(vhd_dynDisk.cached_buff)
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remain_data = vhd_dynDisk.src_file
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while True:
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data = remain_data.read(CHUNK_SIZE)
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if not data:
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break
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try:
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vhdpipe_in.write(data)
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except Exception:
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LOG.debug("Failed when writing data to VHD stream.")
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raise
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def _clean(self):
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if self.conn:
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self.conn.close()
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if self.task_ref:
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self.session.task.destroy(self.task_ref)
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class AddVhdToTar(object):
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def __init__(self, tar_file, tar_info, vhdpipe_out):
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self.tar_file = tar_file
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self.tar_info = tar_info
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self.stream = vhdpipe_out
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def start(self):
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self._add_stream_to_tar()
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def _add_stream_to_tar(self):
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try:
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LOG.debug('self.tar_info.size=%d' % self.tar_info.size)
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self.tar_file.addfile(self.tar_info, fileobj=self.stream)
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LOG.debug('added file %s' % self.tar_info.name)
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except IOError:
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LOG.debug('IOError when streaming vhd to tarball')
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raise
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