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#!/usr/bin/python -tt
#
# Copyright (c) 2011 Intel, 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; version 2 of the License
#
# 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, write to the Free Software Foundation, Inc., 59
# Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import os, sys
from mic import msger
from mic import pluginbase
from mic.conf import configmgr
from mic.utils import errors
__ALL__ = ['PluginMgr', 'pluginmgr']
PLUGIN_TYPES = ["imager", "backend"] # TODO "hook"
class PluginMgr(object):
plugin_dirs = {}
# make the manager class as singleton
_instance = None
def __new__(cls, *args, **kwargs):
if not cls._instance:
cls._instance = super(PluginMgr, cls).__new__(cls, *args, **kwargs)
return cls._instance
def __init__(self):
self.plugin_dir = configmgr.common['plugin_dir']
def append_dirs(self, dirs):
for path in dirs:
self._add_plugindir(path)
# load all the plugins AGAIN
self._load_all()
def _add_plugindir(self, path):
path = os.path.abspath(os.path.expanduser(path))
if not os.path.isdir(path):
msger.warning("Plugin dir is not a directory or does not exist: %s"\
% path)
return
if path not in self.plugin_dirs:
self.plugin_dirs[path] = False
# the value True/False means "loaded"
def _load_all(self):
for (pdir, loaded) in self.plugin_dirs.iteritems():
if loaded: continue
sys.path.insert(0, pdir)
for mod in [x[:-3] for x in os.listdir(pdir) if x.endswith(".py")]:
if mod and mod != '__init__':
if mod in sys.modules:
#self.plugin_dirs[pdir] = True
msger.warning("Module %s already exists, skip" % mod)
else:
try:
pymod = __import__(mod)
self.plugin_dirs[pdir] = True
msger.debug("Plugin module %s:%s imported"\
% (mod, pymod.__file__))
except ImportError, err:
msg = 'Failed to load plugin %s/%s: %s' \
% (os.path.basename(pdir), mod, err)
msger.warning(msg)
del(sys.path[0])
def get_plugins(self, ptype):
""" the return value is dict of name:class pairs """
if ptype not in PLUGIN_TYPES:
raise errors.CreatorError('%s is not valid plugin type' % ptype)
self._add_plugindir(os.path.join(self.plugin_dir, ptype))
self._load_all()
return pluginbase.get_plugins(ptype)
pluginmgr = PluginMgr()
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