OpenStack Image Management (Glance)
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# Copyright 2010-2011 OpenStack Foundation
# 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.
"""Common utilities used in testing"""
import errno
import functools
import os
import shlex
import shutil
import socket
import subprocess
import fixtures
from oslo.config import cfg
from oslo.serialization import jsonutils
from oslo.utils import timeutils
import six
import stubout
import testtools
import webob
from glance.common import config
from glance.common import exception
from glance.common import property_utils
from glance.common import wsgi
from glance import context
from glance.db.sqlalchemy import api as db_api
from glance.db.sqlalchemy import models as db_models
CONF = cfg.CONF
class BaseTestCase(testtools.TestCase):
def setUp(self):
super(BaseTestCase, self).setUp()
# NOTE(bcwaldon): parse_args has to be called to register certain
# command-line options - specifically we need config_dir for
# the following policy tests
config.parse_args(args=[])
self.addCleanup(CONF.reset)
self.stubs = stubout.StubOutForTesting()
self.stubs.Set(exception, '_FATAL_EXCEPTION_FORMAT_ERRORS', True)
self.test_dir = self.useFixture(fixtures.TempDir()).path
def tearDown(self):
self.stubs.UnsetAll()
self.stubs.SmartUnsetAll()
super(BaseTestCase, self).tearDown()
def set_property_protections(self, use_policies=False):
self.unset_property_protections()
conf_file = "property-protections.conf"
if use_policies:
conf_file = "property-protections-policies.conf"
self.config(property_protection_rule_format="policies")
self.property_file = self._copy_data_file(conf_file, self.test_dir)
self.config(property_protection_file=self.property_file)
def unset_property_protections(self):
for section in property_utils.CONFIG.sections():
property_utils.CONFIG.remove_section(section)
def _copy_data_file(self, file_name, dst_dir):
src_file_name = os.path.join('glance/tests/etc', file_name)
shutil.copy(src_file_name, dst_dir)
dst_file_name = os.path.join(dst_dir, file_name)
return dst_file_name
def set_property_protection_rules(self, rules):
with open(self.property_file, 'w') as f:
for rule_key in rules.keys():
f.write('[%s]\n' % rule_key)
for operation in rules[rule_key].keys():
roles_str = ','.join(rules[rule_key][operation])
f.write('%s = %s\n' % (operation, roles_str))
def config(self, **kw):
"""
Override some configuration values.
The keyword arguments are the names of configuration options to
override and their values.
If a group argument is supplied, the overrides are applied to
the specified configuration option group.
All overrides are automatically cleared at the end of the current
test by the fixtures cleanup process.
"""
group = kw.pop('group', None)
for k, v in six.iteritems(kw):
CONF.set_override(k, v, group)
class requires(object):
"""Decorator that initiates additional test setup/teardown."""
def __init__(self, setup=None, teardown=None):
self.setup = setup
self.teardown = teardown
def __call__(self, func):
def _runner(*args, **kw):
if self.setup:
self.setup(args[0])
func(*args, **kw)
if self.teardown:
self.teardown(args[0])
_runner.__name__ = func.__name__
_runner.__doc__ = func.__doc__
return _runner
class depends_on_exe(object):
"""Decorator to skip test if an executable is unavailable"""
def __init__(self, exe):
self.exe = exe
def __call__(self, func):
def _runner(*args, **kw):
cmd = 'which %s' % self.exe
exitcode, out, err = execute(cmd, raise_error=False)
if exitcode != 0:
args[0].disabled_message = 'test requires exe: %s' % self.exe
args[0].disabled = True
func(*args, **kw)
_runner.__name__ = func.__name__
_runner.__doc__ = func.__doc__
return _runner
def skip_if_disabled(func):
"""Decorator that skips a test if test case is disabled."""
@functools.wraps(func)
def wrapped(*a, **kwargs):
func.__test__ = False
test_obj = a[0]
message = getattr(test_obj, 'disabled_message',
'Test disabled')
if getattr(test_obj, 'disabled', False):
test_obj.skipTest(message)
func(*a, **kwargs)
return wrapped
def fork_exec(cmd,
exec_env=None,
logfile=None):
"""
Execute a command using fork/exec.
This is needed for programs system executions that need path
searching but cannot have a shell as their parent process, for
example: glance-api. When glance-api starts it sets itself as
the parent process for its own process group. Thus the pid that
a Popen process would have is not the right pid to use for killing
the process group. This patch gives the test env direct access
to the actual pid.
:param cmd: Command to execute as an array of arguments.
:param exec_env: A dictionary representing the environment with
which to run the command.
:param logile: A path to a file which will hold the stdout/err of
the child process.
"""
env = os.environ.copy()
if exec_env is not None:
for env_name, env_val in exec_env.items():
if callable(env_val):
env[env_name] = env_val(env.get(env_name))
else:
env[env_name] = env_val
pid = os.fork()
if pid == 0:
if logfile:
fds = [1, 2]
with open(logfile, 'r+b') as fptr:
for desc in fds: # close fds
try:
os.dup2(fptr.fileno(), desc)
except OSError:
pass
args = shlex.split(cmd)
os.execvpe(args[0], args, env)
else:
return pid
def wait_for_fork(pid,
raise_error=True,
expected_exitcode=0):
"""
Wait for a process to complete
This function will wait for the given pid to complete. If the
exit code does not match that of the expected_exitcode an error
is raised.
"""
rc = 0
try:
(pid, rc) = os.waitpid(pid, 0)
rc = os.WEXITSTATUS(rc)
if rc != expected_exitcode:
raise RuntimeError('The exit code %d is not %d'
% (rc, expected_exitcode))
except Exception:
if raise_error:
raise
return rc
def execute(cmd,
raise_error=True,
no_venv=False,
exec_env=None,
expect_exit=True,
expected_exitcode=0,
context=None):
"""
Executes a command in a subprocess. Returns a tuple
of (exitcode, out, err), where out is the string output
from stdout and err is the string output from stderr when
executing the command.
:param cmd: Command string to execute
:param raise_error: If returncode is not 0 (success), then
raise a RuntimeError? Default: True)
:param no_venv: Disable the virtual environment
:param exec_env: Optional dictionary of additional environment
variables; values may be callables, which will
be passed the current value of the named
environment variable
:param expect_exit: Optional flag true iff timely exit is expected
:param expected_exitcode: expected exitcode from the launcher
:param context: additional context for error message
"""
env = os.environ.copy()
if exec_env is not None:
for env_name, env_val in exec_env.items():
if callable(env_val):
env[env_name] = env_val(env.get(env_name))
else:
env[env_name] = env_val
# If we're asked to omit the virtualenv, and if one is set up,
# restore the various environment variables
if no_venv and 'VIRTUAL_ENV' in env:
# Clip off the first element of PATH
env['PATH'] = env['PATH'].split(os.pathsep, 1)[-1]
del env['VIRTUAL_ENV']
# Make sure that we use the programs in the
# current source directory's bin/ directory.
path_ext = [os.path.join(os.getcwd(), 'bin')]
# Also jack in the path cmd comes from, if it's absolute
executable = cmd.split()[0]
if os.path.isabs(executable):
path_ext.append(os.path.dirname(executable))
env['PATH'] = ':'.join(path_ext) + ':' + env['PATH']
process = subprocess.Popen(cmd,
shell=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
env=env)
if expect_exit:
result = process.communicate()
(out, err) = result
exitcode = process.returncode
else:
out = ''
err = ''
exitcode = 0
if exitcode != expected_exitcode and raise_error:
msg = "Command %(cmd)s did not succeed. Returned an exit "
"code of %(exitcode)d."
"\n\nSTDOUT: %(out)s"
"\n\nSTDERR: %(err)s" % {'cmd': cmd, 'exitcode': exitcode,
'out': out, 'err': err}
if context:
msg += "\n\nCONTEXT: %s" % context
raise RuntimeError(msg)
return exitcode, out, err
def find_executable(cmdname):
"""
Searches the path for a given cmdname. Returns an absolute
filename if an executable with the given name exists in the path,
or None if one does not.
:param cmdname: The bare name of the executable to search for
"""
# Keep an eye out for the possibility of an absolute pathname
if os.path.isabs(cmdname):
return cmdname
# Get a list of the directories to search
path = ([os.path.join(os.getcwd(), 'bin')] +
os.environ['PATH'].split(os.pathsep))
# Search through each in turn
for elem in path:
full_path = os.path.join(elem, cmdname)
if os.access(full_path, os.X_OK):
return full_path
# No dice...
return None
def get_unused_port():
"""
Returns an unused port on localhost.
"""
port, s = get_unused_port_and_socket()
s.close()
return port
def get_unused_port_and_socket():
"""
Returns an unused port on localhost and the open socket
from which it was created.
"""
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('localhost', 0))
addr, port = s.getsockname()
return (port, s)
def xattr_writes_supported(path):
"""
Returns True if the we can write a file to the supplied
path and subsequently write a xattr to that file.
"""
try:
import xattr
except ImportError:
return False
def set_xattr(path, key, value):
xattr.setxattr(path, "user.%s" % key, str(value))
# We do a quick attempt to write a user xattr to a temporary file
# to check that the filesystem is even enabled to support xattrs
fake_filepath = os.path.join(path, 'testing-checkme')
result = True
with open(fake_filepath, 'wb') as fake_file:
fake_file.write("XXX")
fake_file.flush()
try:
set_xattr(fake_filepath, 'hits', '1')
except IOError as e:
if e.errno == errno.EOPNOTSUPP:
result = False
else:
# Cleanup after ourselves...
if os.path.exists(fake_filepath):
os.unlink(fake_filepath)
return result
def minimal_headers(name, public=True):
headers = {
'Content-Type': 'application/octet-stream',
'X-Image-Meta-Name': name,
'X-Image-Meta-disk_format': 'raw',
'X-Image-Meta-container_format': 'ovf',
}
if public:
headers['X-Image-Meta-Is-Public'] = 'True'
return headers
def minimal_add_command(port, name, suffix='', public=True):
visibility = 'is_public=True' if public else ''
return ("bin/glance --port=%d add %s"
" disk_format=raw container_format=ovf"
" name=%s %s" % (port, visibility, name, suffix))
class RegistryAPIMixIn(object):
def create_fixtures(self):
for fixture in self.FIXTURES:
db_api.image_create(self.context, fixture)
with open(os.path.join(self.test_dir, fixture['id']),
'wb') as image:
image.write("chunk00000remainder")
def destroy_fixtures(self):
db_models.unregister_models(db_api.get_engine())
db_models.register_models(db_api.get_engine())
def get_fixture(self, **kwargs):
fixture = {'name': 'fake public image',
'status': 'active',
'disk_format': 'vhd',
'container_format': 'ovf',
'is_public': True,
'size': 20,
'checksum': None}
fixture.update(kwargs)
return fixture
def get_minimal_fixture(self, **kwargs):
fixture = {'name': 'fake public image',
'is_public': True,
'disk_format': 'vhd',
'container_format': 'ovf'}
fixture.update(kwargs)
return fixture
def get_extra_fixture(self, id, name, **kwargs):
created_at = kwargs.pop('created_at', timeutils.utcnow())
updated_at = kwargs.pop('updated_at', created_at)
return self.get_fixture(
id=id, name=name, deleted=False, deleted_at=None,
created_at=created_at, updated_at=updated_at,
**kwargs)
def get_api_response_ext(self, http_resp, url='/images', headers=None,
body=None, method=None, api=None,
content_type=None):
if api is None:
api = self.api
if headers is None:
headers = {}
req = webob.Request.blank(url)
for k, v in six.iteritems(headers):
req.headers[k] = v
if method:
req.method = method
if body:
req.body = body
if content_type == 'json':
req.content_type = 'application/json'
elif content_type == 'octet':
req.content_type = 'application/octet-stream'
res = req.get_response(api)
self.assertEqual(res.status_int, http_resp)
return res
def assertEqualImages(self, res, uuids, key='images', unjsonify=True):
images = jsonutils.loads(res.body)[key] if unjsonify else res
self.assertEqual(len(images), len(uuids))
for i, value in enumerate(uuids):
self.assertEqual(images[i]['id'], value)
class FakeAuthMiddleware(wsgi.Middleware):
def __init__(self, app, is_admin=False):
super(FakeAuthMiddleware, self).__init__(app)
self.is_admin = is_admin
def process_request(self, req):
auth_token = req.headers.get('X-Auth-Token')
user = None
tenant = None
roles = []
if auth_token:
user, tenant, role = auth_token.split(':')
if tenant.lower() == 'none':
tenant = None
roles = [role]
req.headers['X-User-Id'] = user
req.headers['X-Tenant-Id'] = tenant
req.headers['X-Roles'] = role
req.headers['X-Identity-Status'] = 'Confirmed'
kwargs = {
'user': user,
'tenant': tenant,
'roles': roles,
'is_admin': self.is_admin,
'auth_token': auth_token,
}
req.context = context.RequestContext(**kwargs)
class FakeHTTPResponse(object):
def __init__(self, status=200, headers=None, data=None, *args, **kwargs):
data = data or 'I am a teapot, short and stout\n'
self.data = six.StringIO(data)
self.read = self.data.read
self.status = status
self.headers = headers or {'content-length': len(data)}
def getheader(self, name, default=None):
return self.headers.get(name.lower(), default)
def getheaders(self):
return self.headers or {}
def read(self, amt):
self.data.read(amt)
class Httplib2WsgiAdapter(object):
def __init__(self, app):
self.app = app
def request(self, uri, method="GET", body=None, headers=None):
req = webob.Request.blank(uri, method=method, headers=headers)
req.body = body
resp = req.get_response(self.app)
return Httplib2WebobResponse(resp), resp.body
class Httplib2WebobResponse(object):
def __init__(self, webob_resp):
self.webob_resp = webob_resp
@property
def status(self):
return self.webob_resp.status_code
def __getitem__(self, key):
return self.webob_resp.headers[key]
def get(self, key):
return self.webob_resp.headers[key]
@property
def allow(self):
return self.webob_resp.allow
@allow.setter
def allow(self, allowed):
if type(allowed) is not str:
raise TypeError('Allow header should be a str')
self.webob_resp.allow = allowed
class HttplibWsgiAdapter(object):
def __init__(self, app):
self.app = app
self.req = None
def request(self, method, url, body=None, headers=None):
if headers is None:
headers = {}
self.req = webob.Request.blank(url, method=method, headers=headers)
self.req.body = body
def getresponse(self):
response = self.req.get_response(self.app)
return FakeHTTPResponse(response.status_code, response.headers,
response.body)