/usr/lib/python2.7/dist-packages/dosagelib/loader.py is in dosage 2.12-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2012-2014 Bastian Kleineidam
"""
Functions to load plugin modules.
Example usage:
modules = loader.get_modules('plugins')
plugins = loader.get_plugins(modules, PluginClass)
"""
import os
import sys
import zipfile
import importlib
from .output import out
def is_frozen ():
"""Return True if running inside a py2exe- or py2app-generated
executable."""
return hasattr(sys, "frozen")
def get_modules(folder):
"""Find all valid modules in the given folder which must be in
in the same directory as this loader.py module. A valid module
has a .py extension, and is importable.
@return: all loaded valid modules
@rtype: iterator of module
"""
if is_frozen():
# find modules in library.zip filename
zipname = os.path.dirname(os.path.dirname(__file__))
parentmodule = os.path.basename(os.path.dirname(__file__))
with zipfile.ZipFile(zipname, 'r') as f:
prefix = "%s/%s/" % (parentmodule, folder)
modnames = [os.path.splitext(n[len(prefix):])[0]
for n in f.namelist()
if n.startswith(prefix) and "__init__" not in n]
else:
dirname = os.path.join(os.path.dirname(__file__), folder)
modnames = get_importable_modules(dirname)
for modname in modnames:
try:
name ="..%s.%s" % (folder, modname)
yield importlib.import_module(name, __name__)
except ImportError as msg:
out.error("could not load module %s: %s" % (modname, msg))
def get_importable_modules(folder):
"""Find all module files in the given folder that end with '.py' and
don't start with an underscore.
@return module names
@rtype: iterator of string
"""
for fname in os.listdir(folder):
if fname.endswith('.py') and not fname.startswith('_'):
yield fname[:-3]
def get_plugins(modules, classobj):
"""Find all class objects in all modules.
@param modules: the modules to search
@ptype modules: iterator of modules
@return: found classes
@rytpe: iterator of class objects
"""
for module in modules:
for plugin in get_module_plugins(module, classobj):
yield plugin
def get_module_plugins(module, classobj):
"""Return all subclasses of a class in the module.
If the module defines __all__, only those entries will be searched,
otherwise all objects not starting with '_' will be searched.
"""
try:
names = module.__all__
except AttributeError:
names = [x for x in vars(module) if not x.startswith('_')]
for name in names:
try:
obj = getattr(module, name)
except AttributeError:
continue
try:
if issubclass(obj, classobj):
yield obj
except TypeError:
continue
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