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importutils.py
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Sun, Aug 25, 16:17

importutils.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013 CERN.
##
## Invenio 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 2 of the
## License, or (at your option) any later version.
##
## Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
Invenio import helper functions.
Usage example:
autodiscover_modules(['invenio'], '.+_tasks\.py')
An import difference from pluginutils is that modules are imported in their
package hierarchy, contrary to pluginutils where modules are imported as
standalone Python modules.
"""
import imp
import os
import re
_RACE_PROTECTION = False
def autodiscover_modules(packages, related_name_re='*.py'):
"""
Autodiscover function follows the pattern used by Celery.
@param packages: List of package names to auto discover modules in.
@type packages: list of str
@param related_name_re: Regular expression used to match modules names.
@type related_name_re: str
"""
global _RACE_PROTECTION
if _RACE_PROTECTION:
return []
_RACE_PROTECTION = True
modules = []
try:
tmp = [find_related_modules(pkg, related_name_re) for pkg in packages]
for l in tmp:
for m in l:
if m is not None:
modules.append(m)
# Workaround for finally-statement
except:
_RACE_PROTECTION = False
raise
_RACE_PROTECTION = False
return modules
def find_related_modules(package, related_name_re='(.+)\.py'):
"""Given a package name and a module name pattern, tries to find matching
modules."""
package_elements = package.rsplit(".", 1)
try:
if len(package_elements) == 2:
pkg = __import__(package_elements[0], globals(), locals(), [package_elements[1]])
pkg = getattr(pkg, package_elements[1])
else:
pkg = __import__(package_elements[0], globals(), locals(), [])
pkg_path = pkg.__path__
except AttributeError:
return []
# Find all modules named according to related_name
p = re.compile(related_name_re)
candidates = []
for name in os.listdir(pkg_path[0]):
name = os.path.basename(name)
if p.match(name):
# Remove .py from name
candidates.append(name[:-3])
modules = []
for related_name in candidates:
modules.append(import_related_module(package, pkg_path, related_name))
return modules
def import_related_module(package, pkg_path, related_name):
"""
Import module from given path
"""
try:
imp.find_module(related_name, pkg_path)
except ImportError:
return
return getattr(
__import__('%s' % (package), globals(), locals(), [related_name]),
related_name
)

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