def get_available_plugin_loaders():
"""Retrieve all the plugin classes available on the system.
:returns: A dict with plugin entrypoint name as the key and the plugin
loader as the value.
:rtype: dict
"""
mgr = stevedore.EnabledExtensionManager(namespace=PLUGIN_NAMESPACE,
check_func=_auth_plugin_available,
invoke_on_load=True,
propagate_map_exceptions=True)
return dict(mgr.map(lambda ext: (ext.entry_point.name, ext.obj)))
def get_available_plugin_names():
"""Get the names of all the plugins that are available on the system.
This is particularly useful for help and error text to prompt a user for
example what plugins they may specify.
:returns: A list of names.
:rtype: frozenset
"""
mgr = stevedore.EnabledExtensionManager(namespace=PLUGIN_NAMESPACE,
check_func=_auth_plugin_available,
invoke_on_load=True,
propagate_map_exceptions=True)
return frozenset(mgr.names())
def _load_plugins(self, test_block_config):
"""Load plugins from the 'tavern' entrypoint namespace
This can be a module or a class as long as it defines the right things
Todo:
- Limit which plugins are loaded based on some config/command line
option
- Different plugin names
Args:
test_block_config (dict): available config for test
Raises:
exceptions.MissingSettingsError: Description
Returns:
list: Loaded plugins, can be a class or a module
"""
# pylint: disable=no-self-use
plugins = []
for backend in ["http", "mqtt"]:
namespace = "tavern_{}".format(backend)
def enabled(ext):
# pylint: disable=cell-var-from-loop
return ext.name == test_block_config["backends"][backend]
manager = stevedore.EnabledExtensionManager(
namespace=namespace,
check_func=enabled,
verify_requirements=True,
on_load_failure_callback=plugin_load_error,
)
manager.propagate_map_exceptions = True
manager.map(is_valid_reqresp_plugin)
if len(manager.extensions) != 1:
raise exceptions.MissingSettingsError(
"Expected exactly one entrypoint in 'tavern-{}' namespace but got {}".format(
backend, len(manager.extensions)
)
)
plugins.extend(manager.extensions)
return plugins
