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Commit
587bde3b
authored
Sep 18, 2013
by
Dudás Ádám
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storage: implement get_exclusive()
parent
6413c2ab
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1 changed file
with
26 additions
and
9 deletions
+26
-9
circle/storage/models.py
+26
-9
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circle/storage/models.py
View file @
587bde3b
# coding=utf-8
import
logging
import
uuid
from
django.db
import
models
from
django.utils.translation
import
ugettext_lazy
as
_
from
django.db.models.signals
import
post_delete
...
...
@@ -8,7 +10,7 @@ from model_utils.models import TimeStampedModel
from
manager
import
storage_manager
from
.
import
tasks
import
tasks
logger
=
logging
.
getLogger
(
__name__
)
...
...
@@ -39,9 +41,9 @@ class Disk(TimeStampedModel):
"""
TYPES
=
[(
'qcow2-norm'
,
'qcow2 normal'
),
(
'qcow2-snap'
,
'qcow2 snapshot'
),
(
'iso'
,
'iso'
),
(
'raw-ro'
,
'raw read-only'
),
(
'raw-rw'
,
'raw'
)]
name
=
models
.
CharField
(
max_length
=
100
,
verbose_name
=
_
(
'name'
))
filename
=
models
.
CharField
(
max_length
=
256
,
unique
=
True
,
verbose_name
=
_
(
'filename'
))
name
=
models
.
CharField
(
blank
=
True
,
max_length
=
100
,
verbose_name
=
_
(
'name'
))
filename
=
models
.
CharField
(
max_length
=
256
,
verbose_name
=
_
(
'filename'
))
datastore
=
models
.
ForeignKey
(
DataStore
)
type
=
models
.
CharField
(
max_length
=
10
,
choices
=
TYPES
)
size
=
models
.
IntegerField
()
...
...
@@ -70,14 +72,29 @@ class Disk(TimeStampedModel):
'raw-rw'
:
'raw'
,
}[
self
.
type
]
class
WrongDiskTypeError
(
Exception
):
def
__init__
(
self
,
type
):
self
.
type
=
type
def
__str__
(
self
):
return
(
"Operation can't be invoked on a disk of type '
%
s'."
%
self
.
type
)
def
get_exclusive
(
self
):
"""Get an instance of the disk for exclusive usage.
It might mean copying the disk, creating a snapshot or creating a
symbolic link to a read-only image.
"""
# TODO implement (or call) logic
return
self
if
self
.
type
in
[
'qcow2-snap'
,
'raw-rw'
]:
raise
self
.
WrongDiskTypeError
(
self
.
type
)
filename
=
str
(
uuid
.
uuid4
())
new_type
=
{
'qcow2-norm'
:
'qcow2-snap'
,
'iso'
:
'iso'
,
'raw-ro'
:
'raw-rw'
,
}[
self
.
type
]
return
Disk
(
base
=
self
,
datastore
=
self
.
datastore
,
filename
=
filename
,
name
=
self
.
name
,
size
=
self
.
size
,
type
=
new_type
)
@property
def
device_type
(
self
):
...
...
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