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# Copyright 2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
from __future__ import print_function
import os
from layman.output import Message
class InvalidModuleName(Exception):
'''An invalid or unknown module name.'''
class Module(object):
'''
Class to define and hold our plugin-module
@type name: string
@param name: The module name
@type namepath: string
@param namepath: The path to the new module
@param output: The output for any information
'''
def __init__(self, name, namepath, output):
self.name = name
self._namepath = namepath
self.kids_names = []
self.kids = {}
self.output = output
self.initialized = self._initialize()
def _initialize(self):
'''
Initializes the plug-in module
@rtype bool: reflects success or failure to initialize the module
'''
self.valid = False
try:
mod_name = '.'.join([self._namepath, self.name])
self._module = __import__(mod_name, [], [], ['not empty'])
self.valid = True
except ImportError as e:
self.output.error('Module._initialize(); failed to import %(mod) '\
'error was: %(err)' % ({'err': e, 'mod': mod_name}))
return False
self.module_spec = self._module.module_spec
for submodule in self.module_spec['provides']:
kid = self.module_spec['provides'][submodule]
kidname = kid['name']
kid['module_name'] = '.'.join([mod_name, self.name])
kid['is_imported'] = False
self.kids[kidname] = kid
self.kids_names.append(kidname)
return True
def get_class(self, name):
'''
Retrieves a module class desired
@type name: string
@param name: the plug-in module's name
@rtype mod_class: instance of plug-in module's class
'''
if not name or name not in self.kids_names:
raise InvalidModuleName('Module name "%(name)" was invalid or not'\
'part of the module "%(mod_name)"' ({'mod_name':self.name,
'name': name}))
kid = self.kids[name]
if kid['is_imported']:
module = kid['instance']
else:
try:
module = __import__(kid['module_name'], [], [], ["not empty"])
kid['instance'] = module
kid['is_imported'] = True
except ImportError:
raise
mod_class = getattr(module, kid['class'])
return mod_class
class Modules(object):
'''
Dynamic module system for loading and retrieving any of the
installed layman modules and/or provided class'
@param path: Optional path to the "modules" directory or defaults to
the directory of this file + "/modules"
@param namepath: Optional python import path to the "modules" directory or
defaults to the directory name of this file + ".modules"
@param output: Optional output, defaults to layman.output.Message object
'''
def __init__(self, path=None, namepath=None, output=None):
if path:
self._module_path = path
else:
self._module_path = os.path.join(
(os.path.dirname(os.path.realpath(__file__))), 'modules')
if namepath:
self._namepath = namepath
else:
self._namepath = '.'.join(os.path.dirname(
os.path.realpath(__file__)), 'modules')
if output:
self.output = output
else:
self.output = Message()
self._modules = self._get_all_modules()
self.module_names = sorted(self._modules)
def _get_all_modules(self):
'''
Scans the overlay modules dir for loadable modules
@rtype dict of module_plugins
'''
module_dir = self._module_path
importables = []
names = os.listdir(module_dir)
for entry in names:
if entry.startswith('__'):
continue
try:
os.lstat(os.path.join(module_dir, entry, '__init__.py'))
importables.append(entry)
except EnvironmentError:
pass
kids = {}
for entry in importables:
new_module = Module(entry, self._namepath, self.output)
for module_name in new_module.kids:
kid = new_module.kids[module_name]
kid['parent'] = new_module
kids[kid['name']] = kid
return kids
def get_module_names(self):
'''
Retrieves all available module names
@rtype: list of installed module names available
'''
return self.module_names
def get_class(self, modname):
'''
Retrieves a module class desired
@type modname: string
@param modname: the module class name
'''
if modname and modname in self.module_names:
mod = self._modules[modname]['parent'].get_class(modname)
else:
raise InvalidModuleName('Module name "%(name)s" was invalid or'\
' not found.' % ({'name': modname}))
return mod
def get_description(self, modname):
'''
Retrieves the module class decription
@type modname: string
@param modname: the module class name
@rtype: string of modules class decription
'''
if modname and modname in self.module_names:
mod = self._modules[modname]['description']
else:
raise InvalidModuleName('Module name "%(name)s" was invalid or'\
' not found.' % ({'name': modname}))
return mod
def get_functions(self, modname):
'''
Retrieves the module class exported function names
@type modname: string
@param modname: the module class name
@rtype: list of the modules class exported function names
'''
if modname and modname in self.module_names:
mod = self._modules[modname]['functions']
else:
raise InvalidModuleName('Module name "%(name)s" was invalid or'\
' not found.' % ({'name': modname}))
return mod
def get_func_descriptions(self, modname):
'''
Retrieves the module class exported functions descriptions
@type modname: string
@param modname: the module class name
@rtype: dict of the modules class exported functions descriptions
'''
if modname and modname in self.module_names:
desc = self._modules[modname]['func_desc']
else:
raise InvalidModuleName('Module name "%(name)s" was invalid or'\
' not found.' % ({'name': modname}))
return desc
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