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118 lines
3.6 KiB
118 lines
3.6 KiB
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2013 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import inspect
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import pkgutil
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from .modules import IModule
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import logging
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log = logging.getLogger(__name__)
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class Module(object):
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"""
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Module representation for the module manager
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:param name: module name
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:param cls: module class to be instantiated when
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the module is activated
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"""
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def __init__(self, name, cls):
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self._name = name
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self._cls = cls
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@property
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def name(self):
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return self._name
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@name.setter
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def name(self, new_name):
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self._name = new_name
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def cls(self):
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return self._cls
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class ModuleManager(object):
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"""
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Manages modules
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:param module_paths: path from where module are loaded
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"""
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def __init__(self, module_paths=['modules']):
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self._modules = []
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self._module_paths = module_paths
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def load_modules(self):
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"""
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Finds all the possible modules (classes with IModule as a parent)
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"""
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for _, name, ispkg in pkgutil.iter_modules(self._module_paths):
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if (ispkg):
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log.debug("analyzing {} package directory".format(name))
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try:
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file, pathname, description = imp.find_module(name, self._module_paths)
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module = imp.load_module(name, file, pathname, description)
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classes = inspect.getmembers(module, inspect.isclass)
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for module_class in classes:
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if issubclass(module_class[1], IModule):
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# make sure the module class has IModule as a parent
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if module_class[1].__module__ == name:
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log.info("loading {} module".format(module_class[0].lower()))
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info = Module(name=module_class[0].lower(), cls=module_class[1])
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self._modules.append(info)
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except Exception:
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log.critical("error while analyzing {} package directory".format(name), exc_info=1)
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finally:
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if file:
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file.close()
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def get_all_modules(self):
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"""
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Returns all modules.
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:returns: list of Module objects
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"""
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return self._modules
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def activate_module(self, module, *args, **kwargs):
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"""
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Activates a given module.
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:param module: module to activate (Module object)
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:param args: args passed to the module
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:param kwargs: kwargs passed to the module
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:returns: instantiated module class
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"""
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module_class = module.cls()
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try:
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module_instance = module_class(module.name, *args, **kwargs)
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except Exception:
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log.critical("error while activating the {} module".format(module.name), exc_info=1)
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return None
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log.info("activating the {} module".format(module.name))
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return module_instance
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