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81 lines (70 loc) · 3.29 KB
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from __future__ import absolute_import, division, print_function
def load_plugins(paths):
'''Import all python files (except test_*) in directories. This is required
for registration of services and transport plugins.
:param paths: A path or list of paths containing files to import.
'''
import imp, pkgutil
try: # Python3 compatibility
basestring = basestring
except NameError:
basestring = (str, bytes)
if isinstance(paths, basestring):
paths = list(paths)
for _, name, _ in pkgutil.iter_modules(paths):
if not name.startswith('test_'):
fid, pathname, desc = imp.find_module(name, paths)
imp.load_module(name, fid, pathname, desc)
if fid:
fid.close()
__version__ = '0.59'
def version():
'''Returns the version number of the installed workflows package.'''
return __version__
class WorkflowsError(Exception):
'''Common class for exceptions deliberately raised by workflows package.'''
class DisconnectedError(WorkflowsError):
'''Indicates the connection could not be established or has been lost.'''
class AuthenticationError(WorkflowsError):
'''Indicates the connection could not be established due to incorrect credentials.'''
def add_plugin_register_to_class(*bases):
# This function is based off the six library
# https://github.com/benjaminp/six
#
# Copyright (c) 2010-2017 Benjamin Peterson
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""Create a base class with a plugin registry metaclass."""
# This requires a bit of explanation: the basic idea is to make a dummy
# metaclass for one level of class instantiation that replaces itself with
# the actual metaclass.
class PluginRegister(type):
'''Define metaclass function to keep a list of all subclasses. This enables
looking up subclasses by name.'''
def __init__(cls, name, base, attrs):
'''Add new subclass to list of all known subclasses.'''
if not hasattr(cls, 'plugin_register'):
cls.plugin_register = {}
else:
cls.plugin_register[name] = cls
class Metametaclass(PluginRegister):
'''Dummy metaclass.'''
def __new__(cls, name, this_bases, d):
'''Return the actual metaclass.'''
return PluginRegister(name, bases, d)
return type.__new__(Metametaclass, 'temporary_class', (), {})