django-rest-framework/examples/objectstore/views.py

85 lines
3.1 KiB
Python
Raw Normal View History

from django.conf import settings
from django.core.urlresolvers import reverse
from djangorestframework.views import View
2011-02-19 13:47:26 +03:00
from djangorestframework.response import Response
from djangorestframework import status
import pickle
import os
import uuid
2011-02-07 01:28:03 +03:00
import operator
OBJECT_STORE_DIR = os.path.join(settings.MEDIA_ROOT, 'objectstore')
2011-03-23 01:48:59 +03:00
MAX_FILES = 10
2011-01-30 19:51:06 +03:00
def remove_oldest_files(dir, max_files):
"""
Remove the oldest files in a directory 'dir', leaving at most 'max_files' remaining.
We use this to limit the number of resources in the sandbox.
"""
2011-03-23 01:48:59 +03:00
filepaths = [os.path.join(dir, file) for file in os.listdir(dir) if not file.startswith('.')]
2011-01-30 19:51:06 +03:00
ctime_sorted_paths = [item[0] for item in sorted([(path, os.path.getctime(path)) for path in filepaths],
key=operator.itemgetter(1), reverse=True)]
2011-03-23 01:48:59 +03:00
[os.remove(path) for path in ctime_sorted_paths[max_files:]]
class ObjectStoreRoot(View):
"""
Root of the Object Store API.
Allows the client to get a complete list of all the stored objects, or to create a new stored object.
"""
def get(self, request):
"""
Return a list of all the stored object URLs. (Ordered by creation time, newest first)
"""
2011-03-23 01:48:59 +03:00
filepaths = [os.path.join(OBJECT_STORE_DIR, file) for file in os.listdir(OBJECT_STORE_DIR) if not file.startswith('.')]
ctime_sorted_basenames = [item[0] for item in sorted([(os.path.basename(path), os.path.getctime(path)) for path in filepaths],
key=operator.itemgetter(1), reverse=True)]
return [reverse('stored-object', kwargs={'key':key}) for key in ctime_sorted_basenames]
def post(self, request):
"""
Create a new stored object, with a unique key.
"""
key = str(uuid.uuid1())
pathname = os.path.join(OBJECT_STORE_DIR, key)
pickle.dump(self.CONTENT, open(pathname, 'wb'))
2011-01-30 19:51:06 +03:00
remove_oldest_files(OBJECT_STORE_DIR, MAX_FILES)
return Response(status.HTTP_201_CREATED, self.CONTENT, {'Location': reverse('stored-object', kwargs={'key':key})})
class StoredObject(View):
"""
Represents a stored object.
The object may be any picklable content.
"""
def get(self, request, key):
"""
Return a stored object, by unpickling the contents of a locally stored file.
"""
pathname = os.path.join(OBJECT_STORE_DIR, key)
if not os.path.exists(pathname):
return Response(status.HTTP_404_NOT_FOUND)
return pickle.load(open(pathname, 'rb'))
def put(self, request, key):
"""
Update/create a stored object, by pickling the request content to a locally stored file.
"""
pathname = os.path.join(OBJECT_STORE_DIR, key)
pickle.dump(self.CONTENT, open(pathname, 'wb'))
return self.CONTENT
def delete(self, request):
"""
Delete a stored object, by removing it's pickled file.
"""
pathname = os.path.join(OBJECT_STORE_DIR, key)
if not os.path.exists(pathname):
return Response(status.HTTP_404_NOT_FOUND)
os.remove(pathname)