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gns3-server/gns3server/module_manager.py
2014-05-28 06:26:20 -06:00

118 lines
3.6 KiB
Python

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