242 lines
8.3 KiB
Python
242 lines
8.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 OpenStack, LLC
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Tests the filesystem backend store"""
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import __builtin__
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import errno
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import hashlib
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import os
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import StringIO
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import mox
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from glance.common import exception
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from glance.openstack.common import uuidutils
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from glance.store.filesystem import Store, ChunkedFile
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from glance.store.location import get_location_from_uri
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from glance.tests.unit import base
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class TestStore(base.IsolatedUnitTest):
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def setUp(self):
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"""Establish a clean test environment"""
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super(TestStore, self).setUp()
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self.orig_chunksize = ChunkedFile.CHUNKSIZE
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ChunkedFile.CHUNKSIZE = 10
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self.store = Store()
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def tearDown(self):
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"""Clear the test environment"""
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super(TestStore, self).tearDown()
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ChunkedFile.CHUNKSIZE = self.orig_chunksize
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def test_get(self):
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"""Test a "normal" retrieval of an image in chunks"""
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# First add an image...
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image_id = uuidutils.generate_uuid()
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file_contents = "chunk00000remainder"
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image_file = StringIO.StringIO(file_contents)
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location, size, checksum = self.store.add(image_id,
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image_file,
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len(file_contents))
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# Now read it back...
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uri = "file:///%s/%s" % (self.test_dir, image_id)
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loc = get_location_from_uri(uri)
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(image_file, image_size) = self.store.get(loc)
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expected_data = "chunk00000remainder"
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expected_num_chunks = 2
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data = ""
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num_chunks = 0
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for chunk in image_file:
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num_chunks += 1
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data += chunk
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self.assertEqual(expected_data, data)
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self.assertEqual(expected_num_chunks, num_chunks)
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def test_get_non_existing(self):
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"""
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Test that trying to retrieve a file that doesn't exist
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raises an error
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"""
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loc = get_location_from_uri("file:///%s/non-existing" % self.test_dir)
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self.assertRaises(exception.NotFound,
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self.store.get,
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loc)
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def test_add(self):
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"""Test that we can add an image via the filesystem backend"""
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ChunkedFile.CHUNKSIZE = 1024
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expected_image_id = uuidutils.generate_uuid()
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expected_file_size = 1024 * 5 # 5K
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expected_file_contents = "*" * expected_file_size
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expected_checksum = hashlib.md5(expected_file_contents).hexdigest()
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expected_location = "file://%s/%s" % (self.test_dir,
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expected_image_id)
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image_file = StringIO.StringIO(expected_file_contents)
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location, size, checksum = self.store.add(expected_image_id,
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image_file,
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expected_file_size)
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self.assertEquals(expected_location, location)
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self.assertEquals(expected_file_size, size)
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self.assertEquals(expected_checksum, checksum)
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uri = "file:///%s/%s" % (self.test_dir, expected_image_id)
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loc = get_location_from_uri(uri)
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(new_image_file, new_image_size) = self.store.get(loc)
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new_image_contents = ""
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new_image_file_size = 0
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for chunk in new_image_file:
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new_image_file_size += len(chunk)
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new_image_contents += chunk
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self.assertEquals(expected_file_contents, new_image_contents)
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self.assertEquals(expected_file_size, new_image_file_size)
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def test_add_already_existing(self):
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"""
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Tests that adding an image with an existing identifier
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raises an appropriate exception
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"""
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ChunkedFile.CHUNKSIZE = 1024
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image_id = uuidutils.generate_uuid()
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file_size = 1024 * 5 # 5K
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file_contents = "*" * file_size
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image_file = StringIO.StringIO(file_contents)
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location, size, checksum = self.store.add(image_id,
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image_file,
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file_size)
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image_file = StringIO.StringIO("nevergonnamakeit")
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self.assertRaises(exception.Duplicate,
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self.store.add,
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image_id, image_file, 0)
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def _do_test_add_write_failure(self, errno, exception):
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ChunkedFile.CHUNKSIZE = 1024
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image_id = uuidutils.generate_uuid()
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file_size = 1024 * 5 # 5K
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file_contents = "*" * file_size
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path = os.path.join(self.test_dir, image_id)
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image_file = StringIO.StringIO(file_contents)
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m = mox.Mox()
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m.StubOutWithMock(__builtin__, 'open')
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e = IOError()
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e.errno = errno
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open(path, 'wb').AndRaise(e)
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m.ReplayAll()
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try:
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self.assertRaises(exception,
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self.store.add,
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image_id, image_file, 0)
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self.assertFalse(os.path.exists(path))
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finally:
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m.VerifyAll()
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m.UnsetStubs()
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def test_add_storage_full(self):
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"""
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Tests that adding an image without enough space on disk
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raises an appropriate exception
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"""
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self._do_test_add_write_failure(errno.ENOSPC, exception.StorageFull)
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def test_add_file_too_big(self):
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"""
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Tests that adding an excessively large image file
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raises an appropriate exception
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"""
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self._do_test_add_write_failure(errno.EFBIG, exception.StorageFull)
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def test_add_storage_write_denied(self):
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"""
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Tests that adding an image with insufficient filestore permissions
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raises an appropriate exception
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"""
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self._do_test_add_write_failure(errno.EACCES,
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exception.StorageWriteDenied)
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def test_add_other_failure(self):
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"""
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Tests that a non-space-related IOError does not raise a
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StorageFull exception.
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"""
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self._do_test_add_write_failure(errno.ENOTDIR, IOError)
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def test_add_cleanup_on_read_failure(self):
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"""
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Tests the partial image file is cleaned up after a read
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failure.
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"""
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ChunkedFile.CHUNKSIZE = 1024
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image_id = uuidutils.generate_uuid()
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file_size = 1024 * 5 # 5K
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file_contents = "*" * file_size
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path = os.path.join(self.test_dir, image_id)
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image_file = StringIO.StringIO(file_contents)
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def fake_Error(size):
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raise AttributeError()
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self.stubs.Set(image_file, 'read', fake_Error)
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self.assertRaises(AttributeError,
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self.store.add,
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image_id, image_file, 0)
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self.assertFalse(os.path.exists(path))
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def test_delete(self):
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"""
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Test we can delete an existing image in the filesystem store
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"""
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# First add an image
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image_id = uuidutils.generate_uuid()
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file_size = 1024 * 5 # 5K
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file_contents = "*" * file_size
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image_file = StringIO.StringIO(file_contents)
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location, size, checksum = self.store.add(image_id,
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image_file,
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file_size)
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# Now check that we can delete it
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uri = "file:///%s/%s" % (self.test_dir, image_id)
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loc = get_location_from_uri(uri)
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self.store.delete(loc)
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self.assertRaises(exception.NotFound, self.store.get, loc)
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def test_delete_non_existing(self):
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"""
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Test that trying to delete a file that doesn't exist
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raises an error
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"""
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loc = get_location_from_uri("file:///tmp/glance-tests/non-existing")
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self.assertRaises(exception.NotFound,
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self.store.delete,
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loc)
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