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'''This module implements a templating generator based on Cheetah'''
__revision__ = '$Revision$'
from posixpath import isdir
from Bcfg2.Server.Plugin import Plugin, PluginExecutionError, FileBacked, SingleXMLFileBacked
from lxml.etree import XML, XMLSyntaxError
from Cheetah.Template import Template
import logging
logger = logging.getLogger('Bcfg2.Plugins.TCheetah')
class TemplateFile(FileBacked):
'''Template file creates Cheetah template structures for the loaded file'''
def __init__(self, name, properties):
FileBacked.__init__(self, name)
self.properties = properties
def Index(self):
'''Create the template data structures'''
self.template = Template(self.data, searchList=[self.properties])
self.template.properties = self.properties
# put in owner permission detection
def BuildFile(self, entry, metadata):
'''Build literal file information'''
self.template.metadata = metadata
self.template.properties = self.properties.properties
try:
entry.text = str(self.template)
except:
logger.error("Failed to template %s" % entry.get('name'), exc_info=1)
raise PluginExecutionError
perms = {'owner':'root', 'group':'root', 'perms':'0644'}
[entry.attrib.__setitem__(key, value) for (key, value) in perms.iteritems()]
class CheetahProperties(SingleXMLFileBacked):
'''Class for Cheetah properties'''
def Index(self):
'''Build data into an elementtree object for templating usage'''
try:
self.properties = XML(self.data)
del self.data
except XMLSyntaxError:
logger.error("Failed to parse properties")
class TCheetah(Plugin):
'''The TCheetah generator implements a templating mechanism for configuration files'''
__name__ = 'TCheetah'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, core, datastore):
Plugin.__init__(self, core, datastore)
if self.data[-1] == '/':
self.data = self.data[:-1]
self.Entries['ConfigFile'] = {}
self.entries = {}
self.handles = {}
self.AddDirectoryMonitor('')
self.properties = CheetahProperties('%s/../etc/properties.xml' % self.data, self.core.fam)
def BuildEntry(self, entry, metadata):
'''Dispatch fetch calls to the correct object'''
self.entries[entry.get('name')].BuildFile(entry, metadata)
def HandleEvent(self, event):
'''Unified FAM event handler for DirShadow'''
#print "got event %s %s %s" % ( event.code2str(), event.filename, event.requestID)
action = event.code2str()
if event.filename[0] == '/':
return
epath = "".join([self.data, self.handles[event.requestID], event.filename])
identifier = epath[len(self.data):]
if action in ['exists', 'created']:
if isdir(epath):
self.AddDirectoryMonitor(epath[len(self.data):])
else:
if self.entries.has_key(identifier):
pass
else:
#try:
self.entries[identifier] = TemplateFile(epath, self.properties)
self.entries[identifier].HandleEvent(event)
self.Entries['ConfigFile'][identifier] = self.BuildEntry
#except:
elif action == 'changed':
if self.entries.has_key(identifier):
self.entries[identifier].HandleEvent(event)
elif action == 'deleted':
if self.entries.has_key(identifier):
del self.entries[identifier]
del self.Entries['ConfigFile'][identifier]
def AddDirectoryMonitor(self, relative):
'''Add new directory to FAM structures'''
if not relative:
relative = '/'
if relative[-1] != '/':
relative += '/'
name = self.data + relative
if relative not in self.handles.values():
if not isdir(name):
print "Cheetah: Failed to open directory %s" % (name)
return
reqid = self.core.fam.AddMonitor(name, self)
self.handles[reqid] = relative
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