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# -*- coding: iso-8859-1 -*-
# Copyright (C) 2012-2014 Bastian Kleineidam
"""
Functions to load plugin modules.
Example usage:
modules = loader.get_package_modules('plugins')
plugins = loader.get_plugins(modules, PluginClass)
"""
from __future__ import print_function
import os
import sys
import zipfile
import importlib
import imp
from .fileutil import is_writable_by_others
def is_frozen ():
"""Return True if running inside a py2exe- or py2app-generated
executable."""
return hasattr(sys, "frozen")
def check_writable_by_others(filename):
"""Check if file is writable by others on POSIX systems.
On non-POSIX systems the check is ignored."""
if os.name != 'posix':
# XXX on non-posix systems other bits are relevant
return
return is_writable_by_others(filename)
def get_package_modules(packagename):
"""Find all valid modules in the given package which must be a folder
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, packagename)
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__), packagename)
modnames = [x[:-3] for x in get_importable_files(dirname)]
for modname in modnames:
try:
name ="..%s.%s" % (packagename, modname)
yield importlib.import_module(name, __name__)
except ImportError as msg:
print("WARN: could not load module %s: %s" % (modname, msg))
def get_folder_modules(folder, parentpackage):
"""."""
if check_writable_by_others(folder):
print("ERROR: refuse to load modules from world writable folder %r" % folder)
return
for filename in get_importable_files(folder):
fullname = os.path.join(folder, filename)
modname = parentpackage+"."+filename[:-3]
try:
yield imp.load_source(modname, fullname)
except ImportError as msg:
print("WARN: could not load file %s: %s" % (fullname, msg))
def get_importable_files(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('_'):
fullname = os.path.join(folder, fname)
if check_writable_by_others(fullname):
print("ERROR: refuse to load module from world writable file %r" % fullname)
else:
yield fname
def get_plugins(modules, classes):
"""Find all given (sub-)classes 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, classes):
yield plugin
def get_module_plugins(module, classes):
"""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:
for classobj in classes:
if issubclass(obj, classobj):
yield obj
except TypeError:
continue
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