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Commit
a9e4ec53
authored
Sep 10, 2013
by
Dudás Ádám
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storage: refactoring model and tasks' interfaces
parent
6bb44292
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2 changed files
with
52 additions
and
77 deletions
+52
-77
circle/storage/models.py
+48
-75
circle/storage/tasks.py
+4
-2
No files found.
circle/storage/models.py
View file @
a9e4ec53
# coding=utf-8
import
logging
import
jsonpickle
import
json
from
django.db
import
models
,
transaction
from
django.db
import
models
from
django.utils.translation
import
ugettext_lazy
as
_
from
django.db.models.signals
import
post_
save
,
post_
delete
from
django.db.models.signals
import
post_delete
from
model_utils.models
import
TimeStampedModel
from
.tasks
import
StorageDriver
...
...
@@ -14,9 +12,8 @@ logger = logging.getLogger(__name__)
class
DataStore
(
models
.
Model
):
'''
'''
"""Collection of virtual disks.
"""
name
=
models
.
CharField
(
max_length
=
100
,
unique
=
True
,
verbose_name
=
_
(
'name'
))
path
=
models
.
CharField
(
max_length
=
200
,
unique
=
True
,
...
...
@@ -32,25 +29,41 @@ class DataStore(models.Model):
class
Disk
(
TimeStampedModel
):
"""
Virtual disks."""
FORMATS
=
[(
'qcow2'
,
'qcow2'
),
(
'raw'
,
'raw'
),
(
'iso'
,
'iso'
)]
TYPES
=
[(
'
snapshot'
,
'snapshot'
),
(
'normal'
,
'normal'
)]
name
=
models
.
CharField
(
max_length
=
100
,
unique
=
True
,
verbose_name
=
_
(
'name'
))
datastore
=
models
.
ForeignKey
(
'DataStore'
)
format
=
models
.
CharField
(
max_length
=
10
,
choices
=
FORMATS
)
size
=
models
.
IntegerField
(
)
"""
A virtual disk.
"""
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'
)
)
datastore
=
models
.
ForeignKey
(
DataStore
)
type
=
models
.
CharField
(
max_length
=
10
,
choices
=
TYPES
)
size
=
models
.
IntegerField
()
base
=
models
.
ForeignKey
(
'self'
,
blank
=
True
,
null
=
True
,
related_name
=
'derivatives'
)
ready
=
models
.
BooleanField
(
default
=
False
)
dev_num
=
models
.
CharField
(
max_length
=
1
,
verbose_name
=
"device number"
)
dev_num
=
models
.
CharField
(
default
=
'a'
,
max_length
=
1
,
verbose_name
=
"device number"
)
class
Meta
:
ordering
=
[
'name'
]
verbose_name
=
_
(
'disk'
)
verbose_name_plural
=
_
(
'disks'
)
@property
def
path
(
self
):
return
self
.
datastore
.
path
+
'/'
+
self
.
filename
@property
def
format
(
self
):
return
{
'qcow2-norm'
:
'qcow2'
,
'qcow2-snap'
:
'qcow2'
,
'iso'
:
'iso'
,
'raw-ro'
:
'raw'
,
'raw-rw'
:
'raw'
,
}[
self
.
type
]
def
get_exclusive
(
self
):
"""Get an instance of the disk for exclusive usage.
...
...
@@ -70,75 +83,35 @@ class Disk(TimeStampedModel):
def
get_vmdisk_desc
(
self
):
return
{
'source'
:
self
.
datastore
.
path
+
'/'
+
self
.
name
,
'source'
:
self
.
path
,
'driver_type'
:
self
.
format
,
'driver_cache'
:
'default'
,
'target_device'
:
self
.
device_type
+
self
.
dev_num
}
def
to_json
(
self
):
self
.
base_name
=
self
.
base
.
name
if
self
.
base
else
None
self
.
dir
=
self
.
datastore
.
path
return
jsonpickle
.
encode
(
self
,
unpicklable
=
True
)
def
__unicode__
(
self
):
return
u"
%
s (#
%
d)"
%
(
self
.
name
,
self
.
id
)
@classmethod
def
create_signal
(
cls
,
sender
,
instance
,
created
,
**
kwargs
):
if
not
instance
.
created
:
StorageDriver
.
create_disk
.
delay
(
instance
.
to_json
())
.
get
()
instance
.
created
=
True
instance
.
save
()
def
deploy
(
self
):
if
self
.
ready
:
return
@classmethod
def
delete_signal
(
cls
,
sender
,
instance
,
using
,
**
kwargs
):
StorageDriver
.
delete_disk
.
delay
(
instance
.
to_json
())
.
get
()
disk_desc
=
{
'name'
:
self
.
name
,
'dir'
:
self
.
datastore
.
path
,
'format'
:
self
.
format
,
'size'
:
self
.
size
,
'base_name'
:
self
.
base
.
name
if
self
.
base
else
None
,
'type'
:
self
.
type
}
StorageDriver
.
create_disk
.
delay
(
disk_desc
)
.
get
()
self
.
ready
=
True
self
.
save
()
@classmethod
def
update_disk
(
cls
,
disk
):
name
=
disk
[
'name'
]
modified
=
False
try
:
base
=
cls
.
objects
.
get
(
name
=
disk
[
'base_name'
])
except
cls
.
DoesNotExist
:
base
=
None
try
:
d
=
cls
.
objects
.
get
(
name
=
name
)
except
Disk
.
DoesNotExist
:
d
=
Disk
(
name
=
name
,
created
=
True
,
datastore
=
DataStore
.
objects
.
get
(
path
=
disk
[
'dir'
]),
format
=
disk
[
'format'
],
type
=
disk
[
'type'
])
modified
=
True
if
d
.
size
!=
disk
[
'size'
]
or
d
.
base
!=
base
:
d
.
size
=
disk
[
'size'
]
d
.
base
=
base
modified
=
True
if
modified
:
d
.
full_clean
()
d
.
save
()
def
delete_signal
(
cls
,
sender
,
instance
,
using
,
**
kwargs
):
# TODO
# StorageDriver.delete_disk.delay(instance.to_json()).get()
pass
@classmethod
def
update_disks
(
cls
,
delete
=
True
):
"""Get and register virtual disks from storage driver."""
try
:
json_data
=
StorageDriver
.
list_disks
.
delay
()
.
get
(
timeout
=
10
)
disks
=
json
.
loads
(
json_data
)
except
:
return
with
transaction
.
commit_on_success
():
l
=
[]
for
disk
in
disks
:
print
disk
cls
.
update_disk
(
disk
)
l
.
append
(
disk
[
'name'
])
if
delete
:
cls
.
objects
.
exclude
(
name__in
=
l
)
.
delete
()
post_save
.
connect
(
Disk
.
create_signal
,
sender
=
Disk
)
post_delete
.
connect
(
Disk
.
delete_signal
,
sender
=
Disk
)
circle/storage/tasks.py
View file @
a9e4ec53
...
...
@@ -8,17 +8,19 @@ logger = logging.getLogger(__name__)
class
StorageDriver
:
@celery.task
(
filter
=
task_method
,
name
=
'storagedriver.list_disks'
)
def
list_disks
():
def
list_disks
(
dir
):
pass
@celery.task
(
filter
=
task_method
,
name
=
'storagedriver.create_disk'
)
def
create_disk
(
json_data
):
def
create_disk
(
disk_desc
):
pass
@celery.task
(
filter
=
task_method
,
name
=
'storagedriver.delete_disk'
)
def
delete_disk
(
json_data
):
# TODO review
pass
@celery.task
(
filter
=
task_method
,
name
=
'storagedriver.get_disk'
)
def
get_disk
(
json_data
):
# TODO review
pass
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