salt/tests/support/mixins.py

# -*- coding: utf-8 -*-
'''
    :codeauthor: Pedro Algarvio (pedro@algarvio.me)

    =============
    Class Mix-Ins
    =============

    Some reusable class Mixins
'''
# pylint: disable=repr-flag-used-in-string

# Import python libs
from __future__ import absolute_import, print_function
import os
import sys
import time
import types
import atexit
import pprint
import logging
import tempfile
import functools
import subprocess
import multiprocessing

# Import Salt Testing Libs
from tests.support.mock import NO_MOCK, NO_MOCK_REASON, patch
from tests.support.runtests import RUNTIME_VARS
from tests.support.paths import CODE_DIR

# Import salt libs
import salt.config
import salt.utils.event
import salt.utils.files
import salt.utils.functools
import salt.utils.path
import salt.utils.stringutils
import salt.utils.yaml
import salt.version
import salt.exceptions
import salt.utils.process
from salt.utils.verify import verify_env
from salt.utils.immutabletypes import freeze
from salt._compat import ElementTree as etree

# Import 3rd-party libs
from salt.ext import six
from salt.ext.six.moves import zip  # pylint: disable=import-error,redefined-builtin
from salt.ext.six.moves.queue import Empty  # pylint: disable=import-error,no-name-in-module

log = logging.getLogger(__name__)


class CheckShellBinaryNameAndVersionMixin(object):
    '''
    Simple class mix-in to subclass in companion to :class:`ShellTestCase<tests.support.case.ShellTestCase>` which
    adds a test case to verify proper version report from Salt's CLI tools.
    '''

    _call_binary_ = None
    _call_binary_expected_version_ = None

    def test_version_includes_binary_name(self):
        if getattr(self, '_call_binary_', None) is None:
            self.skipTest('\'_call_binary_\' not defined.')

        if self._call_binary_expected_version_ is None:
            # Late import
            self._call_binary_expected_version_ = salt.version.__version__

        out = '\n'.join(self.run_script(self._call_binary_, '--version'))
        # Assert that the binary name is in the output
        try:
            self.assertIn(self._call_binary_, out)
        except AssertionError:
            # We might have generated the CLI scripts in which case we replace '-' with '_'
            alternate_binary_name = self._call_binary_.replace('-', '_')
            errmsg = 'Neither \'{}\' or \'{}\' were found as part of the binary name in:\n\'{}\''.format(
                self._call_binary_,
                alternate_binary_name,
                out
            )
            self.assertIn(alternate_binary_name, out, msg=errmsg)

        # Assert that the version is in the output
        self.assertIn(self._call_binary_expected_version_, out)


class AdaptedConfigurationTestCaseMixin(object):

    __slots__ = ()

    @staticmethod
    def get_temp_config(config_for, **config_overrides):
        rootdir = tempfile.mkdtemp(dir=RUNTIME_VARS.TMP)
        conf_dir = os.path.join(rootdir, 'conf')
        for key in ('cachedir', 'pki_dir', 'sock_dir'):
            if key not in config_overrides:
                config_overrides[key] = key
        if 'log_file' not in config_overrides:
            config_overrides['log_file'] = 'logs/{}.log'.format(config_for)
        if 'user' not in config_overrides:
            config_overrides['user'] = RUNTIME_VARS.RUNNING_TESTS_USER
        config_overrides['root_dir'] = rootdir

        cdict = AdaptedConfigurationTestCaseMixin.get_config(config_for, from_scratch=True)

        if config_for in ('master', 'client_config'):
            rdict = salt.config.apply_master_config(config_overrides, cdict)
        if config_for == 'minion':
            rdict = salt.config.apply_minion_config(config_overrides, cdict)

        verify_env([os.path.join(rdict['pki_dir'], 'minions'),
                    os.path.join(rdict['pki_dir'], 'minions_pre'),
                    os.path.join(rdict['pki_dir'], 'minions_rejected'),
                    os.path.join(rdict['pki_dir'], 'minions_denied'),
                    os.path.join(rdict['cachedir'], 'jobs'),
                    os.path.join(rdict['cachedir'], 'tokens'),
                    os.path.join(rdict['root_dir'], 'cache', 'tokens'),
                    os.path.join(rdict['pki_dir'], 'accepted'),
                    os.path.join(rdict['pki_dir'], 'rejected'),
                    os.path.join(rdict['pki_dir'], 'pending'),
                    os.path.dirname(rdict['log_file']),
                    rdict['sock_dir'],
                    conf_dir
                   ],
                   RUNTIME_VARS.RUNNING_TESTS_USER,
                   root_dir=rdict['root_dir'],
                   )

        rdict['conf_file'] = os.path.join(conf_dir, config_for)
        with salt.utils.files.fopen(rdict['conf_file'], 'w') as wfh:
            salt.utils.yaml.safe_dump(rdict, wfh, default_flow_style=False)
        return rdict

    @staticmethod
    def get_config(config_for, from_scratch=False):
        if from_scratch:
            if config_for in ('master', 'syndic_master'):
                return salt.config.master_config(
                    AdaptedConfigurationTestCaseMixin.get_config_file_path(config_for)
                )
            elif config_for in ('minion', 'sub_minion'):
                return salt.config.minion_config(
                    AdaptedConfigurationTestCaseMixin.get_config_file_path(config_for)
                )
            elif config_for in ('syndic',):
                return salt.config.syndic_config(
                    AdaptedConfigurationTestCaseMixin.get_config_file_path(config_for),
                    AdaptedConfigurationTestCaseMixin.get_config_file_path('minion')
                )
            elif config_for == 'client_config':
                return salt.config.client_config(
                    AdaptedConfigurationTestCaseMixin.get_config_file_path('master')
                )

        if config_for not in RUNTIME_VARS.RUNTIME_CONFIGS:
            if config_for in ('master', 'syndic_master'):
                RUNTIME_VARS.RUNTIME_CONFIGS[config_for] = freeze(
                    salt.config.master_config(
                        AdaptedConfigurationTestCaseMixin.get_config_file_path(config_for)
                    )
                )
            elif config_for in ('minion', 'sub_minion'):
                RUNTIME_VARS.RUNTIME_CONFIGS[config_for] = freeze(
                    salt.config.minion_config(
                        AdaptedConfigurationTestCaseMixin.get_config_file_path(config_for)
                    )
                )
            elif config_for in ('syndic',):
                RUNTIME_VARS.RUNTIME_CONFIGS[config_for] = freeze(
                    salt.config.syndic_config(
                        AdaptedConfigurationTestCaseMixin.get_config_file_path(config_for),
                        AdaptedConfigurationTestCaseMixin.get_config_file_path('minion')
                    )
                )
            elif config_for == 'client_config':
                RUNTIME_VARS.RUNTIME_CONFIGS[config_for] = freeze(
                    salt.config.client_config(
                        AdaptedConfigurationTestCaseMixin.get_config_file_path('master')
                    )
                )
        return RUNTIME_VARS.RUNTIME_CONFIGS[config_for]

    @property
    def config_dir(self):
        return RUNTIME_VARS.TMP_CONF_DIR

    def get_config_dir(self):
        log.warning('Use the config_dir attribute instead of calling get_config_dir()')
        return self.config_dir

    @staticmethod
    def get_config_file_path(filename):
        if filename == 'syndic_master':
            return os.path.join(RUNTIME_VARS.TMP_SYNDIC_MASTER_CONF_DIR, 'master')
        if filename == 'syndic':
            return os.path.join(RUNTIME_VARS.TMP_SYNDIC_MINION_CONF_DIR, 'minion')
        if filename == 'sub_minion':
            return os.path.join(RUNTIME_VARS.TMP_SUB_MINION_CONF_DIR, 'minion')
        return os.path.join(RUNTIME_VARS.TMP_CONF_DIR, filename)

    @property
    def master_opts(self):
        '''
        Return the options used for the master
        '''
        return self.get_config('master')

    @property
    def minion_opts(self):
        '''
        Return the options used for the minion
        '''
        return self.get_config('minion')

    @property
    def sub_minion_opts(self):
        '''
        Return the options used for the sub_minion
        '''
        return self.get_config('sub_minion')


class SaltClientTestCaseMixin(AdaptedConfigurationTestCaseMixin):
    '''
    Mix-in class that provides a ``client`` attribute which returns a Salt
    :class:`LocalClient<salt:salt.client.LocalClient>`.

    .. code-block:: python

        class LocalClientTestCase(TestCase, SaltClientTestCaseMixin):

            def test_check_pub_data(self):
                just_minions = {'minions': ['m1', 'm2']}
                jid_no_minions = {'jid': '1234', 'minions': []}
                valid_pub_data = {'minions': ['m1', 'm2'], 'jid': '1234'}

                self.assertRaises(EauthAuthenticationError,
                                  self.client._check_pub_data, None)
                self.assertDictEqual({},
                    self.client._check_pub_data(just_minions),
                    'Did not handle lack of jid correctly')

                self.assertDictEqual(
                    {},
                    self.client._check_pub_data({'jid': '0'}),
                    'Passing JID of zero is not handled gracefully')
    '''
    _salt_client_config_file_name_ = 'master'

    @property
    def client(self):
        # Late import
        import salt.client
        if 'runtime_client' not in RUNTIME_VARS.RUNTIME_CONFIGS:
            mopts = self.get_config(self._salt_client_config_file_name_, from_scratch=True)
            RUNTIME_VARS.RUNTIME_CONFIGS['runtime_client'] = salt.client.get_local_client(mopts=mopts)
        return RUNTIME_VARS.RUNTIME_CONFIGS['runtime_client']


class ShellCaseCommonTestsMixin(CheckShellBinaryNameAndVersionMixin):

    _call_binary_expected_version_ = salt.version.__version__

    def test_salt_with_git_version(self):
        if getattr(self, '_call_binary_', None) is None:
            self.skipTest('\'_call_binary_\' not defined.')
        from salt.version import __version_info__, SaltStackVersion
        git = salt.utils.path.which('git')
        if not git:
            self.skipTest('The git binary is not available')
        opts = {
            'stdout': subprocess.PIPE,
            'stderr': subprocess.PIPE,
            'cwd': CODE_DIR,
        }
        if not salt.utils.platform.is_windows():
            opts['close_fds'] = True
        # Let's get the output of git describe
        process = subprocess.Popen(
            [git, 'describe', '--tags', '--first-parent', '--match', 'v[0-9]*'],
            **opts
        )
        out, err = process.communicate()
        if process.returncode != 0:
            process = subprocess.Popen(
                [git, 'describe', '--tags', '--match', 'v[0-9]*'],
                **opts
            )
            out, err = process.communicate()
        if not out:
            self.skipTest(
                'Failed to get the output of \'git describe\'. '
                'Error: \'{0}\''.format(
                    salt.utils.stringutils.to_str(err)
                )
            )

        parsed_version = SaltStackVersion.parse(out)

        if parsed_version.info < __version_info__:
            self.skipTest(
                'We\'re likely about to release a new version. This test '
                'would fail. Parsed(\'{0}\') < Expected(\'{1}\')'.format(
                    parsed_version.info, __version_info__
                )
            )
        elif parsed_version.info != __version_info__:
            self.skipTest(
                'In order to get the proper salt version with the '
                'git hash you need to update salt\'s local git '
                'tags. Something like: \'git fetch --tags\' or '
                '\'git fetch --tags upstream\' if you followed '
                'salt\'s contribute documentation. The version '
                'string WILL NOT include the git hash.'
            )
        out = '\n'.join(self.run_script(self._call_binary_, '--version'))
        self.assertIn(parsed_version.string, out)


class _FixLoaderModuleMockMixinMroOrder(type):
    '''
    This metaclass will make sure that LoaderModuleMockMixin will always come as the first
    base class in order for LoaderModuleMockMixin.setUp to actually run
    '''
    def __new__(mcs, cls_name, cls_bases, cls_dict):
        if cls_name == 'LoaderModuleMockMixin':
            return super(_FixLoaderModuleMockMixinMroOrder, mcs).__new__(mcs, cls_name, cls_bases, cls_dict)
        bases = list(cls_bases)
        for idx, base in enumerate(bases):
            if base.__name__ == 'LoaderModuleMockMixin':
                bases.insert(0, bases.pop(idx))
                break

        # Create the class instance
        instance = super(_FixLoaderModuleMockMixinMroOrder, mcs).__new__(mcs, cls_name, tuple(bases), cls_dict)

        # Apply our setUp function decorator
        instance.setUp = LoaderModuleMockMixin.__setup_loader_modules_mocks__(instance.setUp)
        return instance


class LoaderModuleMockMixin(six.with_metaclass(_FixLoaderModuleMockMixinMroOrder, object)):
    '''
    This class will setup salt loader dunders.
    '''

    # Define our setUp function decorator
    @staticmethod
    def __setup_loader_modules_mocks__(setup_func):

        @functools.wraps(setup_func)
        def wrapper(self):
            if NO_MOCK:
                self.skipTest(NO_MOCK_REASON)

            loader_modules_configs = self.setup_loader_modules()
            if not isinstance(loader_modules_configs, dict):
                raise RuntimeError(
                    '{}.setup_loader_modules() must return a dictionary where the keys are the '
                    'modules that require loader mocking setup and the values, the global module '
                    'variables for each of the module being mocked. For example \'__salt__\', '
                    '\'__opts__\', etc.'.format(self.__class__.__name__)
                )

            salt_dunders = (
                '__opts__', '__salt__', '__runner__', '__context__', '__utils__',
                '__ext_pillar__', '__thorium__', '__states__', '__serializers__', '__ret__',
                '__grains__', '__pillar__', '__sdb__',
                # Proxy is commented out on purpose since some code in salt expects a NameError
                # and is most of the time not a required dunder
                # '__proxy__'
            )

            for module, module_globals in six.iteritems(loader_modules_configs):
                if not isinstance(module, types.ModuleType):
                    raise RuntimeError(
                        'The dictionary keys returned by {}.setup_loader_modules() '
                        'must be an imported module, not {}'.format(
                            self.__class__.__name__,
                            type(module)
                        )
                    )
                if not isinstance(module_globals, dict):
                    raise RuntimeError(
                        'The dictionary values returned by {}.setup_loader_modules() '
                        'must be a dictionary, not {}'.format(
                            self.__class__.__name__,
                            type(module_globals)
                        )
                    )

                module_blacklisted_dunders = module_globals.pop('blacklisted_dunders', ())

                minion_funcs = {}
                if '__salt__' in module_globals and module_globals['__salt__'] == 'autoload':
                    if '__opts__' not in module_globals:
                        raise RuntimeError(
                            'You must provide \'__opts__\' on the {} module globals dictionary '
                            'to auto load the minion functions'.format(module.__name__)
                        )
                    import salt.loader
                    ctx = {}
                    if '__utils__' not in module_globals:
                        utils = salt.loader.utils(module_globals['__opts__'],
                                                  context=module_globals.get('__context__') or ctx)
                        module_globals['__utils__'] = utils
                    minion_funcs = salt.loader.minion_mods(
                        module_globals['__opts__'],
                        context=module_globals.get('__context__') or ctx,
                        utils=module_globals.get('__utils__'),
                    )
                    module_globals['__salt__'] = minion_funcs

                for dunder_name in salt_dunders:
                    if dunder_name not in module_globals:
                        if dunder_name in module_blacklisted_dunders:
                            continue
                        module_globals[dunder_name] = {}

                sys_modules = module_globals.pop('sys.modules', None)
                if sys_modules is not None:
                    if not isinstance(sys_modules, dict):
                        raise RuntimeError(
                            '\'sys.modules\' must be a dictionary not: {}'.format(
                                type(sys_modules)
                            )
                        )
                    patcher = patch.dict(sys.modules, sys_modules)
                    patcher.start()

                    def cleanup_sys_modules(patcher, sys_modules):
                        patcher.stop()
                        del patcher
                        del sys_modules

                    self.addCleanup(cleanup_sys_modules, patcher, sys_modules)

                for key in module_globals:
                    if not hasattr(module, key):
                        if key in salt_dunders:
                            setattr(module, key, {})
                        else:
                            setattr(module, key, None)

                if module_globals:
                    patcher = patch.multiple(module, **module_globals)
                    patcher.start()

                    def cleanup_module_globals(patcher, module_globals):
                        patcher.stop()
                        del patcher
                        del module_globals

                    self.addCleanup(cleanup_module_globals, patcher, module_globals)

                if minion_funcs:
                    # Since we autoloaded the minion_funcs, let's namespace the functions with the globals
                    # used to patch above
                    import salt.utils
                    for func in minion_funcs:
                        minion_funcs[func] = salt.utils.functools.namespaced_function(
                            minion_funcs[func],
                            module_globals,
                            preserve_context=True
                        )
            return setup_func(self)
        return wrapper

    def setup_loader_modules(self):
        raise NotImplementedError(
            '\'{}.setup_loader_modules()\' must be implemented'.format(self.__class__.__name__)
        )


class XMLEqualityMixin(object):

    def assertEqualXML(self, e1, e2):
        if six.PY3 and isinstance(e1, bytes):
            e1 = e1.decode('utf-8')
        if six.PY3 and isinstance(e2, bytes):
            e2 = e2.decode('utf-8')
        if isinstance(e1, six.string_types):
            e1 = etree.XML(e1)
        if isinstance(e2, six.string_types):
            e2 = etree.XML(e2)
        if e1.tag != e2.tag:
            return False
        if e1.text != e2.text:
            return False
        if e1.tail != e2.tail:
            return False
        if e1.attrib != e2.attrib:
            return False
        if len(e1) != len(e2):
            return False
        return all(self.assertEqualXML(c1, c2) for c1, c2 in zip(e1, e2))


class SaltReturnAssertsMixin(object):

    def assertReturnSaltType(self, ret):
        try:
            self.assertTrue(isinstance(ret, dict))
        except AssertionError:
            raise AssertionError(
                '{0} is not dict. Salt returned: {1}'.format(
                    type(ret).__name__, ret
                )
            )

    def assertReturnNonEmptySaltType(self, ret):
        self.assertReturnSaltType(ret)
        try:
            self.assertNotEqual(ret, {})
        except AssertionError:
            raise AssertionError(
                '{} is equal to {}. Salt returned an empty dictionary.'
            )

    def __return_valid_keys(self, keys):
        if isinstance(keys, tuple):
            # If it's a tuple, turn it into a list
            keys = list(keys)
        elif isinstance(keys, six.string_types):
            # If it's a string, make it a one item list
            keys = [keys]
        elif not isinstance(keys, list):
            # If we've reached here, it's a bad type passed to keys
            raise RuntimeError('The passed keys need to be a list')
        return keys

    def __getWithinSaltReturn(self, ret, keys):
        self.assertReturnNonEmptySaltType(ret)
        ret_data = []
        for part in six.itervalues(ret):
            keys = self.__return_valid_keys(keys)
            okeys = keys[:]
            try:
                ret_item = part[okeys.pop(0)]
            except (KeyError, TypeError):
                raise AssertionError(
                    'Could not get ret{0} from salt\'s return: {1}'.format(
                        ''.join(['[\'{0}\']'.format(k) for k in keys]), part
                    )
                )
            while okeys:
                try:
                    ret_item = ret_item[okeys.pop(0)]
                except (KeyError, TypeError):
                    raise AssertionError(
                        'Could not get ret{0} from salt\'s return: {1}'.format(
                            ''.join(['[\'{0}\']'.format(k) for k in keys]), part
                        )
                    )
            ret_data.append(ret_item)
        return ret_data

    def assertSaltTrueReturn(self, ret):
        try:
            for saltret in self.__getWithinSaltReturn(ret, 'result'):
                self.assertTrue(saltret)
        except AssertionError:
            log.info('Salt Full Return:\n%s', pprint.pformat(ret))
            try:
                raise AssertionError(
                    '{result} is not True. Salt Comment:\n{comment}'.format(
                        **(next(six.itervalues(ret)))
                    )
                )
            except (AttributeError, IndexError):
                raise AssertionError(
                    'Failed to get result. Salt Returned:\n{0}'.format(
                        pprint.pformat(ret)
                    )
                )

    def assertSaltFalseReturn(self, ret):
        try:
            for saltret in self.__getWithinSaltReturn(ret, 'result'):
                self.assertFalse(saltret)
        except AssertionError:
            log.info('Salt Full Return:\n%s', pprint.pformat(ret))
            try:
                raise AssertionError(
                    '{result} is not False. Salt Comment:\n{comment}'.format(
                        **(next(six.itervalues(ret)))
                    )
                )
            except (AttributeError, IndexError):
                raise AssertionError(
                    'Failed to get result. Salt Returned: {0}'.format(ret)
                )

    def assertSaltNoneReturn(self, ret):
        try:
            for saltret in self.__getWithinSaltReturn(ret, 'result'):
                self.assertIsNone(saltret)
        except AssertionError:
            log.info('Salt Full Return:\n%s', pprint.pformat(ret))
            try:
                raise AssertionError(
                    '{result} is not None. Salt Comment:\n{comment}'.format(
                        **(next(six.itervalues(ret)))
                    )
                )
            except (AttributeError, IndexError):
                raise AssertionError(
                    'Failed to get result. Salt Returned: {0}'.format(ret)
                )

    def assertInSaltComment(self, in_comment, ret):
        for saltret in self.__getWithinSaltReturn(ret, 'comment'):
            self.assertIn(in_comment, saltret)

    def assertNotInSaltComment(self, not_in_comment, ret):
        for saltret in self.__getWithinSaltReturn(ret, 'comment'):
            self.assertNotIn(not_in_comment, saltret)

    def assertSaltCommentRegexpMatches(self, ret, pattern):
        return self.assertInSaltReturnRegexpMatches(ret, pattern, 'comment')

    def assertInSaltStateWarning(self, in_comment, ret):
        for saltret in self.__getWithinSaltReturn(ret, 'warnings'):
            self.assertIn(in_comment, saltret)

    def assertNotInSaltStateWarning(self, not_in_comment, ret):
        for saltret in self.__getWithinSaltReturn(ret, 'warnings'):
            self.assertNotIn(not_in_comment, saltret)

    def assertInSaltReturn(self, item_to_check, ret, keys):
        for saltret in self.__getWithinSaltReturn(ret, keys):
            self.assertIn(item_to_check, saltret)

    def assertNotInSaltReturn(self, item_to_check, ret, keys):
        for saltret in self.__getWithinSaltReturn(ret, keys):
            self.assertNotIn(item_to_check, saltret)

    def assertInSaltReturnRegexpMatches(self, ret, pattern, keys=()):
        for saltret in self.__getWithinSaltReturn(ret, keys):
            self.assertRegex(saltret, pattern)

    def assertSaltStateChangesEqual(self, ret, comparison, keys=()):
        keys = ['changes'] + self.__return_valid_keys(keys)
        for saltret in self.__getWithinSaltReturn(ret, keys):
            self.assertEqual(saltret, comparison)

    def assertSaltStateChangesNotEqual(self, ret, comparison, keys=()):
        keys = ['changes'] + self.__return_valid_keys(keys)
        for saltret in self.__getWithinSaltReturn(ret, keys):
            self.assertNotEqual(saltret, comparison)


def _fetch_events(q):
    '''
    Collect events and store them
    '''
    def _clean_queue():
        print('Cleaning queue!')
        while not q.empty():
            queue_item = q.get()
            queue_item.task_done()

    atexit.register(_clean_queue)
    a_config = AdaptedConfigurationTestCaseMixin()
    event = salt.utils.event.get_event(
        'minion',
        sock_dir=a_config.get_config('minion')['sock_dir'],
        opts=a_config.get_config('minion'),
    )

    # Wait for event bus to be connected
    while not event.connect_pull(30):
        time.sleep(1)

    # Notify parent process that the event bus is connected
    q.put('CONNECTED')

    while True:
        try:
            events = event.get_event(full=False)
        except Exception as exc:
            # This is broad but we'll see all kinds of issues right now
            # if we drop the proc out from under the socket while we're reading
            log.exception("Exception caught while getting events %r", exc)
        q.put(events)


class SaltMinionEventAssertsMixin(object):
    '''
    Asserts to verify that a given event was seen
    '''

    @classmethod
    def setUpClass(cls):
        cls.q = multiprocessing.Queue()
        cls.fetch_proc = salt.utils.process.SignalHandlingMultiprocessingProcess(
            target=_fetch_events,
            args=(cls.q,),
            name='Process-{}-Queue'.format(cls.__name__)
        )
        cls.fetch_proc.start()
        # Wait for the event bus to be connected
        msg = cls.q.get(block=True)
        if msg != 'CONNECTED':
            # Just in case something very bad happens
            raise RuntimeError('Unexpected message in test\'s event queue')
        return object.__new__(cls)

    @classmethod
    def tearDownClass(cls):
        cls.fetch_proc.join()
        del cls.q
        del cls.fetch_proc

    def assertMinionEventFired(self, tag):
        #TODO
        raise salt.exceptions.NotImplemented('assertMinionEventFired() not implemented')

    def assertMinionEventReceived(self, desired_event, timeout=5, sleep_time=0.5):
        start = time.time()
        while True:
            try:
                event = self.q.get(False)
            except Empty:
                time.sleep(sleep_time)
                if time.time() - start >= timeout:
                    break
                continue
            if isinstance(event, dict):
                event.pop('_stamp')
            if desired_event == event:
                self.fetch_proc.terminate()
                return True
            if time.time() - start >= timeout:
                break
        self.fetch_proc.terminate()
        raise AssertionError('Event {0} was not received by minion'.format(desired_event))