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# Copyright (c) 2012 Red Hat, Inc.
#
# 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 for plugins.utils """
import unittest
import errno
import xattr
import cPickle as pickle
from collections import defaultdict
from plugins import utils
#
# Somewhat hacky way of emulating the operation of xattr calls. They are made
# against a dictionary that stores the xattr key/value pairs.
#
_xattrs = {}
_xattr_op_cnt = defaultdict(int)
_xattr_err = {}
def _xkey(path, key):
return "%s:%s" % (path, key)
def _setxattr(path, key, value):
_xattr_op_cnt['set'] += 1
xkey = _xkey(path, key)
if xkey in _xattr_err:
e = IOError()
e.errno = _xattr_err[xkey]
raise e
global _xattrs
_xattrs[xkey] = value
def _getxattr(path, key):
_xattr_op_cnt['get'] += 1
xkey = _xkey(path, key)
if xkey in _xattr_err:
e = IOError()
e.errno = _xattr_err[xkey]
raise e
global _xattrs
if xkey in _xattrs:
ret_val = _xattrs[xkey]
else:
e = IOError("Fake IOError")
e.errno = errno.ENODATA
raise e
return ret_val
def _removexattr(path, key):
_xattr_op_cnt['remove'] += 1
xkey = _xkey(path, key)
if xkey in _xattr_err:
e = IOError()
e.errno = _xattr_err[xkey]
raise e
global _xattrs
if xkey in _xattrs:
del _xattrs[xkey]
else:
e = IOError("Fake IOError")
e.errno = errno.ENODATA
raise e
def _initxattr():
global _xattrs
_xattrs = {}
global _xattr_op_cnt
_xattr_op_cnt = defaultdict(int)
global _xattr_err
_xattr_err = {}
# Save the current methods
global _xattr_set; _xattr_set = xattr.set
global _xattr_get; _xattr_get = xattr.get
global _xattr_remove; _xattr_remove = xattr.remove
# Monkey patch the calls we use with our internal unit test versions
xattr.set = _setxattr
xattr.get = _getxattr
xattr.remove = _removexattr
def _destroyxattr():
# Restore the current methods just in case
global _xattr_set; xattr.set = _xattr_set
global _xattr_get; xattr.get = _xattr_get
global _xattr_remove; xattr.remove = _xattr_remove
# Destroy the stored values and
global _xattrs; _xattrs = None
class TestUtils(unittest.TestCase):
""" Tests for plugins.utils """
def setUp(self):
_initxattr()
def tearDown(self):
_destroyxattr()
def test_write_metadata(self):
path = "/tmp/foo/w"
orig_d = { 'bar' : 'foo' }
utils.write_metadata(path, orig_d)
xkey = _xkey(path, utils.METADATA_KEY)
assert len(_xattrs.keys()) == 1
assert xkey in _xattrs
assert orig_d == pickle.loads(_xattrs[xkey])
assert _xattr_op_cnt['set'] == 1
def test_write_metadata_err(self):
path = "/tmp/foo/w"
orig_d = { 'bar' : 'foo' }
xkey = _xkey(path, utils.METADATA_KEY)
_xattr_err[xkey] = errno.EOPNOTSUPP
try:
utils.write_metadata(path, orig_d)
except IOError as e:
assert e.errno == errno.EOPNOTSUPP
assert len(_xattrs.keys()) == 0
assert _xattr_op_cnt['set'] == 1
else:
self.fail("Expected an IOError exception on write")
def test_write_metadata_multiple(self):
# At 64 KB an xattr key/value pair, this should generate three keys.
path = "/tmp/foo/w"
orig_d = { 'bar' : 'x' * 150000 }
utils.write_metadata(path, orig_d)
assert len(_xattrs.keys()) == 3, "Expected 3 keys, found %d" % len(_xattrs.keys())
payload = ''
for i in range(0,3):
xkey = _xkey(path, "%s%s" % (utils.METADATA_KEY, i or ''))
assert xkey in _xattrs
assert len(_xattrs[xkey]) <= utils.MAX_XATTR_SIZE
payload += _xattrs[xkey]
assert orig_d == pickle.loads(payload)
assert _xattr_op_cnt['set'] == 3, "%r" % _xattr_op_cnt
def test_clean_metadata(self):
path = "/tmp/foo/c"
expected_d = { 'a': 'y' * 150000 }
expected_p = pickle.dumps(expected_d, utils.PICKLE_PROTOCOL)
for i in range(0,3):
xkey = _xkey(path, "%s%s" % (utils.METADATA_KEY, i or ''))
_xattrs[xkey] = expected_p[:utils.MAX_XATTR_SIZE]
expected_p = expected_p[utils.MAX_XATTR_SIZE:]
assert not expected_p
utils.clean_metadata(path)
assert _xattr_op_cnt['remove'] == 4, "%r" % _xattr_op_cnt
def test_clean_metadata_err(self):
path = "/tmp/foo/c"
xkey = _xkey(path, utils.METADATA_KEY)
_xattrs[xkey] = pickle.dumps({ 'a': 'y' }, utils.PICKLE_PROTOCOL)
_xattr_err[xkey] = errno.EOPNOTSUPP
try:
utils.clean_metadata(path)
except IOError as e:
assert e.errno == errno.EOPNOTSUPP
assert _xattr_op_cnt['remove'] == 1, "%r" % _xattr_op_cnt
else:
self.fail("Expected an IOError exception on remove")
def test_read_metadata(self):
path = "/tmp/foo/r"
expected_d = { 'a': 'y' }
xkey = _xkey(path, utils.METADATA_KEY)
_xattrs[xkey] = pickle.dumps(expected_d, utils.PICKLE_PROTOCOL)
res_d = utils.read_metadata(path)
assert res_d == expected_d, "Expected %r, result %r" % (expected_d, res_d)
assert _xattr_op_cnt['get'] == 1, "%r" % _xattr_op_cnt
def test_read_metadata_notfound(self):
path = "/tmp/foo/r"
res_d = utils.read_metadata(path)
assert res_d == {}
assert _xattr_op_cnt['get'] == 1, "%r" % _xattr_op_cnt
def test_read_metadata_err(self):
path = "/tmp/foo/r"
expected_d = { 'a': 'y' }
xkey = _xkey(path, utils.METADATA_KEY)
_xattrs[xkey] = pickle.dumps(expected_d, utils.PICKLE_PROTOCOL)
_xattr_err[xkey] = errno.EOPNOTSUPP
try:
res_d = utils.read_metadata(path)
except IOError as e:
assert e.errno == errno.EOPNOTSUPP
assert (_xattr_op_cnt['get'] == 1), "%r" % _xattr_op_cnt
else:
self.fail("Expected an IOError exception on get")
def test_read_metadata_multiple(self):
path = "/tmp/foo/r"
expected_d = { 'a': 'y' * 150000 }
expected_p = pickle.dumps(expected_d, utils.PICKLE_PROTOCOL)
for i in range(0,3):
xkey = _xkey(path, "%s%s" % (utils.METADATA_KEY, i or ''))
_xattrs[xkey] = expected_p[:utils.MAX_XATTR_SIZE]
expected_p = expected_p[utils.MAX_XATTR_SIZE:]
assert not expected_p
res_d = utils.read_metadata(path)
assert res_d == expected_d, "Expected %r, result %r" % (expected_d, res_d)
assert _xattr_op_cnt['get'] == 3, "%r" % _xattr_op_cnt
def test_read_metadata_multiple_one_missing(self):
path = "/tmp/foo/r"
expected_d = { 'a': 'y' * 150000 }
expected_p = pickle.dumps(expected_d, utils.PICKLE_PROTOCOL)
for i in range(0,2):
xkey = _xkey(path, "%s%s" % (utils.METADATA_KEY, i or ''))
_xattrs[xkey] = expected_p[:utils.MAX_XATTR_SIZE]
expected_p = expected_p[utils.MAX_XATTR_SIZE:]
assert len(expected_p) <= utils.MAX_XATTR_SIZE
res_d = utils.read_metadata(path)
assert res_d == {}
assert _xattr_op_cnt['get'] == 3, "%r" % _xattr_op_cnt
assert len(_xattrs.keys()) == 0, "Expected 0 keys, found %d" % len(_xattrs.keys())
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