/usr/share/pyshared/glance/tests/unit/test_filesystem_store.py is in python-glance 2012.1.3+stable~20120821-120fcf-0ubuntu1.5.
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# Copyright 2011 OpenStack, LLC
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Tests the filesystem backend store"""
import errno
import StringIO
import hashlib
import unittest
import stubout
from glance.common import exception
from glance.common import utils
from glance.store.location import get_location_from_uri
from glance.store.filesystem import Store, ChunkedFile
from glance.tests.unit import base
class TestStore(base.IsolatedUnitTest):
def setUp(self):
"""Establish a clean test environment"""
super(TestStore, self).setUp()
self.orig_chunksize = ChunkedFile.CHUNKSIZE
ChunkedFile.CHUNKSIZE = 10
self.store = Store(self.conf)
def tearDown(self):
"""Clear the test environment"""
super(TestStore, self).tearDown()
ChunkedFile.CHUNKSIZE = self.orig_chunksize
def test_get(self):
"""Test a "normal" retrieval of an image in chunks"""
# First add an image...
image_id = utils.generate_uuid()
file_contents = "chunk00000remainder"
location = "file://%s/%s" % (self.test_dir, image_id)
image_file = StringIO.StringIO(file_contents)
location, size, checksum = self.store.add(image_id,
image_file,
len(file_contents))
# Now read it back...
uri = "file:///%s/%s" % (self.test_dir, image_id)
loc = get_location_from_uri(uri)
(image_file, image_size) = self.store.get(loc)
expected_data = "chunk00000remainder"
expected_num_chunks = 2
data = ""
num_chunks = 0
for chunk in image_file:
num_chunks += 1
data += chunk
self.assertEqual(expected_data, data)
self.assertEqual(expected_num_chunks, num_chunks)
def test_get_non_existing(self):
"""
Test that trying to retrieve a file that doesn't exist
raises an error
"""
loc = get_location_from_uri("file:///%s/non-existing" % self.test_dir)
self.assertRaises(exception.NotFound,
self.store.get,
loc)
def test_add(self):
"""Test that we can add an image via the filesystem backend"""
ChunkedFile.CHUNKSIZE = 1024
expected_image_id = utils.generate_uuid()
expected_file_size = 1024 * 5 # 5K
expected_file_contents = "*" * expected_file_size
expected_checksum = hashlib.md5(expected_file_contents).hexdigest()
expected_location = "file://%s/%s" % (self.test_dir,
expected_image_id)
image_file = StringIO.StringIO(expected_file_contents)
location, size, checksum = self.store.add(expected_image_id,
image_file,
expected_file_size)
self.assertEquals(expected_location, location)
self.assertEquals(expected_file_size, size)
self.assertEquals(expected_checksum, checksum)
uri = "file:///%s/%s" % (self.test_dir, expected_image_id)
loc = get_location_from_uri(uri)
(new_image_file, new_image_size) = self.store.get(loc)
new_image_contents = ""
new_image_file_size = 0
for chunk in new_image_file:
new_image_file_size += len(chunk)
new_image_contents += chunk
self.assertEquals(expected_file_contents, new_image_contents)
self.assertEquals(expected_file_size, new_image_file_size)
def test_add_already_existing(self):
"""
Tests that adding an image with an existing identifier
raises an appropriate exception
"""
ChunkedFile.CHUNKSIZE = 1024
image_id = utils.generate_uuid()
file_size = 1024 * 5 # 5K
file_contents = "*" * file_size
location = "file://%s/%s" % (self.test_dir, image_id)
image_file = StringIO.StringIO(file_contents)
location, size, checksum = self.store.add(image_id,
image_file,
file_size)
image_file = StringIO.StringIO("nevergonnamakeit")
self.assertRaises(exception.Duplicate,
self.store.add,
image_id, image_file, 0)
def _do_test_add_failure(self, errno, exception):
ChunkedFile.CHUNKSIZE = 1024
image_id = utils.generate_uuid()
file_size = 1024 * 5 # 5K
file_contents = "*" * file_size
location = "file://%s/%s" % (self.test_dir, image_id)
image_file = StringIO.StringIO(file_contents)
def fake_IO_Error(size):
e = IOError()
e.errno = errno
raise e
self.stubs.Set(image_file, 'read', fake_IO_Error)
self.assertRaises(exception,
self.store.add,
image_id, image_file, 0)
def test_add_storage_full(self):
"""
Tests that adding an image without enough space on disk
raises an appropriate exception
"""
self._do_test_add_failure(errno.ENOSPC, exception.StorageFull)
def test_add_file_too_big(self):
"""
Tests that adding an excessively large image file
raises an appropriate exception
"""
self._do_test_add_failure(errno.EFBIG, exception.StorageFull)
def test_add_storage_write_denied(self):
"""
Tests that adding an image with insufficient filestore permissions
raises an appropriate exception
"""
self._do_test_add_failure(errno.EACCES, exception.StorageWriteDenied)
def test_add_other_failure(self):
"""
Tests that a non-space-related IOError does not raise a
StorageFull exception.
"""
self._do_test_add_failure(errno.ENOTDIR, IOError)
def test_delete(self):
"""
Test we can delete an existing image in the filesystem store
"""
# First add an image
image_id = utils.generate_uuid()
file_size = 1024 * 5 # 5K
file_contents = "*" * file_size
location = "file://%s/%s" % (self.test_dir, image_id)
image_file = StringIO.StringIO(file_contents)
location, size, checksum = self.store.add(image_id,
image_file,
file_size)
# Now check that we can delete it
uri = "file:///%s/%s" % (self.test_dir, image_id)
loc = get_location_from_uri(uri)
self.store.delete(loc)
self.assertRaises(exception.NotFound, self.store.get, loc)
def test_delete_non_existing(self):
"""
Test that trying to delete a file that doesn't exist
raises an error
"""
loc = get_location_from_uri("file:///tmp/glance-tests/non-existing")
self.assertRaises(exception.NotFound,
self.store.delete,
loc)
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