mirror of
https://github.com/encode/django-rest-framework.git
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107 lines
3.5 KiB
Python
107 lines
3.5 KiB
Python
from django.conf import settings
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from djangorestframework.reverse import reverse
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from djangorestframework.views import View
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from djangorestframework.response import Response
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from djangorestframework import status
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import pickle
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import os
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import uuid
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import operator
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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):
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os.makedirs(OBJECT_STORE_DIR)
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def remove_oldest_files(dir, max_files):
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"""
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Remove the oldest files in a directory 'dir', leaving at most 'max_files' remaining.
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We use this to limit the number of resources in the sandbox.
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"""
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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],
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key=operator.itemgetter(1), reverse=True)]
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[os.remove(path) for path in ctime_sorted_paths[max_files:]]
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def get_filename(key):
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"""
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Given a stored object's key returns the file's path.
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"""
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return os.path.join(OBJECT_STORE_DIR, key)
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def get_file_url(key, request):
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"""
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Given a stored object's key returns the URL for the object.
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"""
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return reverse('stored-object', kwargs={'key': key}, request=request)
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class ObjectStoreRoot(View):
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"""
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Root of the Object Store API.
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Allows the client to get a complete list of all the stored objects, or to create a new stored object.
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"""
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def get(self, request):
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"""
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Return a list of all the stored object URLs. (Ordered by creation time, newest first)
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"""
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filepaths = [os.path.join(OBJECT_STORE_DIR, file)
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for file in os.listdir(OBJECT_STORE_DIR)
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if not file.startswith('.')]
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ctime_sorted_basenames = [item[0] for item in sorted([(os.path.basename(path), os.path.getctime(path)) for path in filepaths],
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key=operator.itemgetter(1), reverse=True)]
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return [get_file_url(key, request) for key in ctime_sorted_basenames]
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def post(self, request):
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"""
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Create a new stored object, with a unique key.
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"""
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key = str(uuid.uuid1())
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filename = get_filename(key)
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pickle.dump(self.CONTENT, open(filename, 'wb'))
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remove_oldest_files(OBJECT_STORE_DIR, MAX_FILES)
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url = get_file_url(key, request)
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return Response(status.HTTP_201_CREATED, self.CONTENT, {'Location': url})
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class StoredObject(View):
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"""
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Represents a stored object.
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The object may be any picklable content.
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"""
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def get(self, request, key):
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"""
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Return a stored object, by unpickling the contents of a locally
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stored file.
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"""
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filename = get_filename(key)
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if not os.path.exists(filename):
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return Response(status.HTTP_404_NOT_FOUND)
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return pickle.load(open(filename, 'rb'))
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def put(self, request, key):
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"""
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Update/create a stored object, by pickling the request content to a
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locally stored file.
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"""
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filename = get_filename(key)
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pickle.dump(self.CONTENT, open(filename, 'wb'))
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return self.CONTENT
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def delete(self, request, key):
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"""
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Delete a stored object, by removing it's pickled file.
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"""
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filename = get_filename(key)
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if not os.path.exists(filename):
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return Response(status.HTTP_404_NOT_FOUND)
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os.remove(filename)
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