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"""Tests for stevedore.extension
"""
import mock
from stevedore import extension
from stevedore.tests import utils
ALL_NAMES = ['e1', 't1', 't2']
WORKING_NAMES = ['t1', 't2']
class FauxExtension(object):
def __init__(self, *args, **kwds):
self.args = args
self.kwds = kwds
def get_args_and_data(self, data):
return self.args, self.kwds, data
class BrokenExtension(object):
def __init__(self, *args, **kwds):
raise IOError("Did not create")
class TestCallback(utils.TestCase):
def test_detect_plugins(self):
em = extension.ExtensionManager('stevedore.test.extension')
names = sorted(em.names())
self.assertEqual(names, ALL_NAMES)
def test_get_by_name(self):
em = extension.ExtensionManager('stevedore.test.extension')
e = em['t1']
self.assertEqual(e.name, 't1')
def test_contains_by_name(self):
em = extension.ExtensionManager('stevedore.test.extension')
self.assertEqual('t1' in em, True)
def test_get_by_name_missing(self):
em = extension.ExtensionManager('stevedore.test.extension')
try:
em['t3']
except KeyError:
pass
else:
assert False, 'Failed to raise KeyError'
def test_load_multiple_times_entry_points(self):
# We expect to get the same EntryPoint object because we save them
# in the cache.
em1 = extension.ExtensionManager('stevedore.test.extension')
eps1 = [ext.entry_point for ext in em1]
em2 = extension.ExtensionManager('stevedore.test.extension')
eps2 = [ext.entry_point for ext in em2]
self.assertIs(eps1[0], eps2[0])
def test_load_multiple_times_plugins(self):
# We expect to get the same plugin object (module or class)
# because the underlying import machinery will cache the values.
em1 = extension.ExtensionManager('stevedore.test.extension')
plugins1 = [ext.plugin for ext in em1]
em2 = extension.ExtensionManager('stevedore.test.extension')
plugins2 = [ext.plugin for ext in em2]
self.assertIs(plugins1[0], plugins2[0])
def test_use_cache(self):
# If we insert something into the cache of entry points,
# the manager should not have to call into pkg_resources
# to find the plugins.
cache = extension.ExtensionManager.ENTRY_POINT_CACHE
cache['stevedore.test.faux'] = []
with mock.patch('pkg_resources.iter_entry_points',
side_effect=
AssertionError('called iter_entry_points')):
em = extension.ExtensionManager('stevedore.test.faux')
names = em.names()
self.assertEqual(names, [])
def test_iterable(self):
em = extension.ExtensionManager('stevedore.test.extension')
names = sorted(e.name for e in em)
self.assertEqual(names, ALL_NAMES)
def test_invoke_on_load(self):
em = extension.ExtensionManager('stevedore.test.extension',
invoke_on_load=True,
invoke_args=('a',),
invoke_kwds={'b': 'B'},
)
self.assertEqual(len(em.extensions), 2)
for e in em.extensions:
self.assertEqual(e.obj.args, ('a',))
self.assertEqual(e.obj.kwds, {'b': 'B'})
def test_map_return_values(self):
def mapped(ext, *args, **kwds):
return ext.name
em = extension.ExtensionManager('stevedore.test.extension',
invoke_on_load=True,
)
results = em.map(mapped)
self.assertEqual(sorted(results), WORKING_NAMES)
def test_map_arguments(self):
objs = []
def mapped(ext, *args, **kwds):
objs.append((ext, args, kwds))
em = extension.ExtensionManager('stevedore.test.extension',
invoke_on_load=True,
)
em.map(mapped, 1, 2, a='A', b='B')
self.assertEqual(len(objs), 2)
names = sorted([o[0].name for o in objs])
self.assertEqual(names, WORKING_NAMES)
for o in objs:
self.assertEqual(o[1], (1, 2))
self.assertEqual(o[2], {'a': 'A', 'b': 'B'})
def test_map_eats_errors(self):
def mapped(ext, *args, **kwds):
raise RuntimeError('hard coded error')
em = extension.ExtensionManager('stevedore.test.extension',
invoke_on_load=True,
)
results = em.map(mapped, 1, 2, a='A', b='B')
self.assertEqual(results, [])
def test_map_propagate_exceptions(self):
def mapped(ext, *args, **kwds):
raise RuntimeError('hard coded error')
em = extension.ExtensionManager('stevedore.test.extension',
invoke_on_load=True,
propagate_map_exceptions=True
)
try:
em.map(mapped, 1, 2, a='A', b='B')
assert False
except RuntimeError:
pass
def test_map_errors_when_no_plugins(self):
expected_str = 'No stevedore.test.extension.none extensions found'
def mapped(ext, *args, **kwds):
pass
em = extension.ExtensionManager('stevedore.test.extension.none',
invoke_on_load=True,
)
try:
em.map(mapped, 1, 2, a='A', b='B')
except RuntimeError as err:
self.assertEqual(expected_str, str(err))
def test_map_method(self):
em = extension.ExtensionManager('stevedore.test.extension',
invoke_on_load=True,
)
result = em.map_method('get_args_and_data', 42)
self.assertEqual(set(r[2] for r in result), set([42]))
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