Revision c449760f snf-cyclades-app/synnefo/volume/snapshots.py
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import logging |
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from django.utils import simplejson as json |
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from django.db import transaction |
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from snf_django.lib.api import faults |
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from synnefo.plankton.utils import image_backend |
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from synnefo.logic import backend |
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from synnefo.volume import util |
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#import datetime |
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#from snf_django.lib.api.utils import isoformat |
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log = logging.getLogger(__name__) |
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PLANKTON_DOMAIN = "plankton" |
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PLANKTON_PREFIX = "plankton:" |
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PROPERTY_PREFIX = "property:" |
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SNAPSHOT_PREFIX = "snapshot:" |
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SNAPSHOTS_CONTAINER = "snapshots" |
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SNAPSHOTS_DOMAIN = "plankton" |
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SNAPSHOTS_PREFIX = "plankton:" |
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SNAPSHOTS_TYPE = "application/octet-stream" |
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SNAPSHOTS_MAPFILE_PREFIX = "archip:" |
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|
| ... | ... | |
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volume.save() |
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transaction.commit() |
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# Snapshot information are stored as metadata on the Pithos file |
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snapshot_metadata = {
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SNAPSHOTS_PREFIX + "name": name, |
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SNAPSHOTS_PREFIX + "description": description, |
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SNAPSHOTS_PREFIX + "volume_id": volume.id, |
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SNAPSHOTS_PREFIX + "status": "CREATING", |
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PLANKTON_PREFIX + "name": name, |
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PLANKTON_PREFIX + "status": "CREATING", |
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PLANKTON_PREFIX + "disk_format": "diskdump", |
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PLANKTON_PREFIX + "container_format": "bare", |
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PLANKTON_PREFIX + "is_snapshot": True, |
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# Snapshot specific |
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PLANKTON_PREFIX + "description": description, |
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PLANKTON_PREFIX + "volume_id": volume.id, |
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} |
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# TODO: The following are used in order plankton to work with snapshots |
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# exactly as with iamges |
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snapshot_metadata.update({
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SNAPSHOTS_PREFIX + "store": "pithos", |
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SNAPSHOTS_PREFIX + "disk_format": "diskdump", |
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SNAPSHOTS_PREFIX + "default_container_format": "bare", |
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SNAPSHOTS_PREFIX + "metadata": json.dumps(metadata)}) |
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# Set a special attribute to distinquish snapshots from the images |
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snapshot_metadata[SNAPSHOTS_PREFIX + "is_snapshot"] = True |
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# Snapshots are used as images. We set the most important properties |
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# that are being used for images. We set 'EXCLUDE_ALL_TASKS' to bypass |
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# image customization. Also, we get some basic metadata for the volume from |
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# the server that the volume is attached |
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image_properties = {"EXCLUDE_ALL_TASKS": "yes",
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"description": description}
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metadata.update({"EXCLUDE_ALL_TASKS": "yes",
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"description": description})
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vm_metadata = dict(volume.machine.metadata |
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.filter(meta_key__in=["OS", "users"]) |
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.values_list("meta_key", "meta_value"))
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for key in ["OS", "users"]: |
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val = vm_metadata.get(key) |
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if val is not None: |
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image_properties[key] = val |
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snapshot_metadata[SNAPSHOTS_PREFIX + "properties"] = \ |
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json.dumps(image_properties) |
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metadata.update(vm_metadata) |
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for key, val in metadata.items(): |
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snapshot_metadata[PLANKTON_PREFIX + PROPERTY_PREFIX + key] = val |
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# Generate a name for the Pithos file. Also, generate a name for the |
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# Archipelago mapfile. |
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container=SNAPSHOTS_CONTAINER, |
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name=snapshot_pithos_name, |
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size=size, |
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domain=SNAPSHOTS_DOMAIN,
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domain=PLANKTON_DOMAIN,
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type=SNAPSHOTS_TYPE, |
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mapfile=mapfile, |
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meta=snapshot_metadata, |
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replace_meta=True, |
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permissions=None) |
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#checksum=None, |
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backend.snapshot_instance(volume.machine, |
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snapshot_name=snapshot_pithos_name) |
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def generate_snapshot_pithos_name(volume): |
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"""Helper function to generate a name for the Pithos file.""" |
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# time = isoformat(datetime.datetime.now()) |
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return "snapshot-of-volume-%s-%s" % (volume.id,
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volume.snapshot_counter)
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return "snf-snap-%s-%s" % (volume.id,
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volume.snapshot_counter) |
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@transaction.commit_on_success |
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