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'''This module implements a templating generator based on Cheetah'''
__revision__ = '$Revision$'
import binascii
import logging
import sys
import traceback
import Bcfg2.Server.Plugin
logger = logging.getLogger('Bcfg2.Plugins.TCheetah')
try:
import Cheetah.Template
import Cheetah.Parser
except:
logger.error("TCheetah: Failed to import Cheetah. Is it installed?")
raise
class TemplateFile:
"""Template file creates Cheetah template structures for the loaded file."""
def __init__(self, name, specific, encoding):
self.name = name
self.specific = specific
self.encoding = encoding
self.template = None
self.searchlist = dict()
def handle_event(self, event):
"""Handle all fs events for this template."""
if event.code2str() == 'deleted':
return
try:
s = {'useStackFrames': False}
self.template = Cheetah.Template.Template(open(self.name).read(),
compilerSettings=s,
searchList=self.searchlist)
except Cheetah.Parser.ParseError, perror:
logger.error("Cheetah parse error for file %s" % (self.name))
logger.error(perror.report())
def bind_entry(self, entry, metadata):
"""Build literal file information."""
self.template.metadata = metadata
self.searchlist['metadata'] = metadata
self.template.path = entry.get('realname', entry.get('name'))
self.searchlist['path'] = entry.get('realname', entry.get('name'))
self.template.source_path = self.name
self.searchlist['source_path'] = self.name
if entry.tag == 'Path':
entry.set('type', 'file')
try:
if type(self.template) == unicode:
entry.text = self.template
else:
if entry.get('encoding') == 'base64':
# take care of case where file needs base64 encoding
entry.text = binascii.b2a_base64(self.template)
else:
entry.text = unicode(str(self.template), self.encoding)
except:
(a, b, c) = sys.exc_info()
msg = traceback.format_exception(a, b, c, limit=2)[-1][:-1]
logger.error(msg)
logger.error("TCheetah template error for %s" % self.searchlist['path'])
del a, b, c
raise Bcfg2.Server.Plugin.PluginExecutionError
class TCheetah(Bcfg2.Server.Plugin.GroupSpool):
"""The TCheetah generator implements a templating mechanism for configuration files."""
name = 'TCheetah'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
filename_pattern = 'template'
es_child_cls = TemplateFile
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