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import logging
import lxml.etree
import sys
import Bcfg2.Server.Plugin
logger = logging.getLogger('Bcfg2.Plugins.Decisions')
class DecisionFile(Bcfg2.Server.Plugin.SpecificData):
def handle_event(self, event):
Bcfg2.Server.Plugin.SpecificData.handle_event(self, event)
self.contents = lxml.etree.XML(self.data)
def get_decisions(self):
return [(x.get('type'), x.get('name')) for x in self.contents.xpath('.//Decision')]
class DecisionSet(Bcfg2.Server.Plugin.EntrySet):
def __init__(self, path, fam, encoding):
"""Container for decision specification files.
Arguments:
- `path`: repository path
- `fam`: reference to the file monitor
- `encoding`: XML character encoding
"""
pattern = '(white|black)list'
Bcfg2.Server.Plugin.EntrySet.__init__(self, pattern, path, \
DecisionFile, encoding)
try:
fam.AddMonitor(path, self)
except OSError:
e = sys.exc_info()[1]
logger.error('Adding filemonitor for %s failed. '
'Make sure directory exists' % path)
raise Bcfg2.Server.Plugin.PluginInitError(e)
def HandleEvent(self, event):
if event.filename != self.path:
return self.handle_event(event)
def GetDecisions(self, metadata, mode):
ret = []
candidates = [c for c in self.get_matching(metadata)
if c.name.split('/')[-1].startswith(mode)]
for c in candidates:
ret += c.get_decisions()
return ret
class Decisions(DecisionSet,
Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Decision):
name = 'Decisions'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, core, datastore):
"""Decisions plugins
Arguments:
- `core`: Bcfg2.Core instance
- `datastore`: File repository location
"""
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Decision.__init__(self)
DecisionSet.__init__(self, self.data, core.fam, core.encoding)
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