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

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from django.conf import settings
from djangorestframework.utils import reverse
from djangorestframework.views import View
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from djangorestframework.response import Response
from djangorestframework import status
import pickle
import os
import uuid
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import operator
OBJECT_STORE_DIR = os.path.join(settings.MEDIA_ROOT, 'objectstore')
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MAX_FILES = 10
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if not os.path.exists(OBJECT_STORE_DIR):
os.makedirs(OBJECT_STORE_DIR)
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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.
"""
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filepaths = [os.path.join(dir, file) for file in os.listdir(dir) if not file.startswith('.')]
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ctime_sorted_paths = [item[0] for item in sorted([(path, os.path.getctime(path)) for path in filepaths],
key=operator.itemgetter(1), reverse=True)]
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[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)
"""
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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', request, kwargs={'key':key}) for key in ctime_sorted_basenames]
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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'))
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remove_oldest_files(OBJECT_STORE_DIR, MAX_FILES)
return Response(status.HTTP_201_CREATED, self.CONTENT, {'Location': reverse('stored-object', request, 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
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def delete(self, request, key):
"""
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)