root / snf-cyclades-app / synnefo / volume / snapshots.py @ 18ca395d
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1 | 18ca395d | Christos Stavrakakis | import logging |
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2 | dec501fa | Christos Stavrakakis | from django.utils import simplejson as json |
3 | dec501fa | Christos Stavrakakis | from django.db import transaction |
4 | dec501fa | Christos Stavrakakis | from snf_django.lib.api import faults |
5 | dec501fa | Christos Stavrakakis | from synnefo.plankton.utils import image_backend |
6 | dec501fa | Christos Stavrakakis | from synnefo.logic import backend |
7 | dec501fa | Christos Stavrakakis | from synnefo.volume import util |
8 | dec501fa | Christos Stavrakakis | |
9 | 18ca395d | Christos Stavrakakis | #import datetime
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10 | 18ca395d | Christos Stavrakakis | #from snf_django.lib.api.utils import isoformat
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11 | 18ca395d | Christos Stavrakakis | |
12 | 18ca395d | Christos Stavrakakis | log = logging.getLogger(__name__) |
13 | 18ca395d | Christos Stavrakakis | |
14 | dec501fa | Christos Stavrakakis | SNAPSHOTS_CONTAINER = "snapshots"
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15 | dec501fa | Christos Stavrakakis | SNAPSHOTS_DOMAIN = "plankton"
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16 | dec501fa | Christos Stavrakakis | SNAPSHOTS_PREFIX = "plankton:"
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17 | dec501fa | Christos Stavrakakis | SNAPSHOTS_TYPE = "application/octet-stream"
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18 | dec501fa | Christos Stavrakakis | SNAPSHOTS_MAPFILE_PREFIX = "archip:"
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19 | dec501fa | Christos Stavrakakis | |
20 | dec501fa | Christos Stavrakakis | |
21 | dec501fa | Christos Stavrakakis | @transaction.commit_on_success
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22 | dec501fa | Christos Stavrakakis | def create(user_id, volume, name, description, metadata, force=False): |
23 | 18ca395d | Christos Stavrakakis | """Create a snapshot from a given volume
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24 | 18ca395d | Christos Stavrakakis |
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25 | 18ca395d | Christos Stavrakakis | Create a snapshot from a given volume. The snapshot is first created as
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26 | 18ca395d | Christos Stavrakakis | a file in Pithos, with specified metadata to indicate that it is a
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27 | 18ca395d | Christos Stavrakakis | snapshot. Then a job is sent to Ganeti backend to create the actual
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28 | 18ca395d | Christos Stavrakakis | snapshot of the volume.
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29 | 18ca395d | Christos Stavrakakis |
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30 | 18ca395d | Christos Stavrakakis | Snapshots are only supported for volumes of ext_ disk template. Also,
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31 | 18ca395d | Christos Stavrakakis | the volume must be attached to some server.
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32 | dec501fa | Christos Stavrakakis |
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33 | 18ca395d | Christos Stavrakakis | """
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34 | 18ca395d | Christos Stavrakakis | |
35 | 18ca395d | Christos Stavrakakis | # Check that taking a snapshot is feasible
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36 | dec501fa | Christos Stavrakakis | if volume.machine is None: |
37 | 18ca395d | Christos Stavrakakis | raise faults.BadRequest("Cannot snapshot a detached volume!") |
38 | dec501fa | Christos Stavrakakis | |
39 | f518210b | Christos Stavrakakis | flavor = volume.machine.flavor |
40 | f518210b | Christos Stavrakakis | if not flavor.disk_template.startswith("ext_"): |
41 | f518210b | Christos Stavrakakis | msg = ("Snapshots are supported only for volumes of ext_*"
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42 | f518210b | Christos Stavrakakis | " disk template")
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43 | f518210b | Christos Stavrakakis | raise faults.BadRequest(msg)
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44 | f518210b | Christos Stavrakakis | |
45 | 18ca395d | Christos Stavrakakis | # Increase the snapshot counter of the volume that is used in order to
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46 | 18ca395d | Christos Stavrakakis | # generate unique snapshot names
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47 | dec501fa | Christos Stavrakakis | volume.snapshot_counter += 1
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48 | dec501fa | Christos Stavrakakis | volume.save() |
49 | e7953d63 | Christos Stavrakakis | transaction.commit() |
50 | dec501fa | Christos Stavrakakis | |
51 | 18ca395d | Christos Stavrakakis | # Snapshot information are stored as metadata on the Pithos file
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52 | 18ca395d | Christos Stavrakakis | snapshot_metadata = { |
53 | 18ca395d | Christos Stavrakakis | SNAPSHOTS_PREFIX + "name": name,
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54 | 18ca395d | Christos Stavrakakis | SNAPSHOTS_PREFIX + "description": description,
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55 | 18ca395d | Christos Stavrakakis | SNAPSHOTS_PREFIX + "volume_id": volume.id,
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56 | 18ca395d | Christos Stavrakakis | SNAPSHOTS_PREFIX + "status": "CREATING", |
57 | 18ca395d | Christos Stavrakakis | } |
58 | 18ca395d | Christos Stavrakakis | |
59 | 18ca395d | Christos Stavrakakis | # TODO: The following are used in order plankton to work with snapshots
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60 | 18ca395d | Christos Stavrakakis | # exactly as with iamges
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61 | 18ca395d | Christos Stavrakakis | snapshot_metadata.update({ |
62 | 18ca395d | Christos Stavrakakis | SNAPSHOTS_PREFIX + "store": "pithos", |
63 | 18ca395d | Christos Stavrakakis | SNAPSHOTS_PREFIX + "disk_format": "diskdump", |
64 | 18ca395d | Christos Stavrakakis | SNAPSHOTS_PREFIX + "default_container_format": "bare", |
65 | 18ca395d | Christos Stavrakakis | SNAPSHOTS_PREFIX + "metadata": json.dumps(metadata)})
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66 | 18ca395d | Christos Stavrakakis | |
67 | 18ca395d | Christos Stavrakakis | # Set a special attribute to distinquish snapshots from the images
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68 | dec501fa | Christos Stavrakakis | snapshot_metadata[SNAPSHOTS_PREFIX + "is_snapshot"] = True |
69 | 18ca395d | Christos Stavrakakis | |
70 | 18ca395d | Christos Stavrakakis | # Snapshots are used as images. We set the most important properties
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71 | 18ca395d | Christos Stavrakakis | # that are being used for images. We set 'EXCLUDE_ALL_TASKS' to bypass
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72 | 18ca395d | Christos Stavrakakis | # image customization. Also, we get some basic metadata for the volume from
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73 | 18ca395d | Christos Stavrakakis | # the server that the volume is attached
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74 | e7953d63 | Christos Stavrakakis | image_properties = {"EXCLUDE_ALL_TASKS": "yes", |
75 | e7953d63 | Christos Stavrakakis | "description": description}
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76 | 18ca395d | Christos Stavrakakis | vm_metadata = dict(volume.machine.metadata
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77 | 18ca395d | Christos Stavrakakis | .values_list("meta_key", "meta_value")) |
78 | e7953d63 | Christos Stavrakakis | for key in ["OS", "users"]: |
79 | e7953d63 | Christos Stavrakakis | val = vm_metadata.get(key) |
80 | e7953d63 | Christos Stavrakakis | if val is not None: |
81 | e7953d63 | Christos Stavrakakis | image_properties[key] = val |
82 | 18ca395d | Christos Stavrakakis | snapshot_metadata[SNAPSHOTS_PREFIX + "properties"] = \
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83 | 18ca395d | Christos Stavrakakis | json.dumps(image_properties) |
84 | dec501fa | Christos Stavrakakis | |
85 | 18ca395d | Christos Stavrakakis | # Generate a name for the Pithos file. Also, generate a name for the
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86 | 18ca395d | Christos Stavrakakis | # Archipelago mapfile.
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87 | 18ca395d | Christos Stavrakakis | snapshot_pithos_name = generate_snapshot_pithos_name(volume) |
88 | 18ca395d | Christos Stavrakakis | mapfile = SNAPSHOTS_MAPFILE_PREFIX + snapshot_pithos_name |
89 | dec501fa | Christos Stavrakakis | |
90 | 18ca395d | Christos Stavrakakis | # Convert size from Gbytes to bytes
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91 | e7953d63 | Christos Stavrakakis | size = volume.size << 30
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92 | 18ca395d | Christos Stavrakakis | |
93 | dec501fa | Christos Stavrakakis | with image_backend(user_id) as pithos_backend: |
94 | dec501fa | Christos Stavrakakis | # move this to plankton backend
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95 | dec501fa | Christos Stavrakakis | snapshot_uuid = pithos_backend.backend.register_object_map( |
96 | dec501fa | Christos Stavrakakis | user=user_id, |
97 | dec501fa | Christos Stavrakakis | account=user_id, |
98 | dec501fa | Christos Stavrakakis | container=SNAPSHOTS_CONTAINER, |
99 | 18ca395d | Christos Stavrakakis | name=snapshot_pithos_name, |
100 | e7953d63 | Christos Stavrakakis | size=size, |
101 | e7953d63 | Christos Stavrakakis | domain=SNAPSHOTS_DOMAIN, |
102 | dec501fa | Christos Stavrakakis | type=SNAPSHOTS_TYPE, |
103 | dec501fa | Christos Stavrakakis | mapfile=mapfile, |
104 | dec501fa | Christos Stavrakakis | meta=snapshot_metadata, |
105 | e7953d63 | Christos Stavrakakis | replace_meta=True,
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106 | dec501fa | Christos Stavrakakis | permissions=None)
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107 | dec501fa | Christos Stavrakakis | #checksum=None,
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108 | dec501fa | Christos Stavrakakis | |
109 | 18ca395d | Christos Stavrakakis | backend.snapshot_instance(volume.machine, |
110 | 18ca395d | Christos Stavrakakis | snapshot_name=snapshot_pithos_name) |
111 | dec501fa | Christos Stavrakakis | |
112 | dec501fa | Christos Stavrakakis | snapshot = util.get_snapshot(user_id, snapshot_uuid) |
113 | dec501fa | Christos Stavrakakis | |
114 | dec501fa | Christos Stavrakakis | return snapshot
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115 | dec501fa | Christos Stavrakakis | |
116 | dec501fa | Christos Stavrakakis | |
117 | 18ca395d | Christos Stavrakakis | def generate_snapshot_pithos_name(volume): |
118 | 18ca395d | Christos Stavrakakis | """Helper function to generate a name for the Pithos file."""
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119 | 18ca395d | Christos Stavrakakis | # time = isoformat(datetime.datetime.now())
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120 | 18ca395d | Christos Stavrakakis | return "snapshot-of-volume-%s-%s" % (volume.id, |
121 | 18ca395d | Christos Stavrakakis | volume.snapshot_counter) |
122 | dec501fa | Christos Stavrakakis | |
123 | dec501fa | Christos Stavrakakis | |
124 | dec501fa | Christos Stavrakakis | @transaction.commit_on_success
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125 | dec501fa | Christos Stavrakakis | def delete(snapshot): |
126 | 18ca395d | Christos Stavrakakis | """Delete a snapshot.
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127 | 18ca395d | Christos Stavrakakis |
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128 | 18ca395d | Christos Stavrakakis | Delete a snapshot by deleting the corresponding file from Pithos.
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129 | 18ca395d | Christos Stavrakakis |
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130 | 18ca395d | Christos Stavrakakis | """
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131 | dec501fa | Christos Stavrakakis | user_id = snapshot["owner"]
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132 | 18ca395d | Christos Stavrakakis | log.info("Deleting snapshot '%s'", snapshot["location"]) |
133 | dec501fa | Christos Stavrakakis | with image_backend(user_id) as pithos_backend: |
134 | dec501fa | Christos Stavrakakis | pithos_backend.delete_snapshot(snapshot["uuid"])
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135 | dec501fa | Christos Stavrakakis | return snapshot
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136 | 18ca395d | Christos Stavrakakis | |
137 | 18ca395d | Christos Stavrakakis | |
138 | 18ca395d | Christos Stavrakakis | def rename(snapshot, new_name): |
139 | 18ca395d | Christos Stavrakakis | # user_id = snapshot["owner"]
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140 | 18ca395d | Christos Stavrakakis | raise NotImplemented("Renaming a snapshot is not implemented!") |
141 | 18ca395d | Christos Stavrakakis | |
142 | 18ca395d | Christos Stavrakakis | |
143 | 18ca395d | Christos Stavrakakis | def update_description(snapshot, new_description): |
144 | 18ca395d | Christos Stavrakakis | # user_id = snapshot["owner"]
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145 | 18ca395d | Christos Stavrakakis | raise NotImplemented("Updating snapshot's description is not implemented!") |