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'''This module implements a templating generator based on Cheetah'''
__revision__ = '$Revision$'
import logging, lxml.etree, posixpath, re, Cheetah.Parser, Cheetah.Template
import Bcfg2.Server.Plugin
logger = logging.getLogger('Bcfg2.Plugins.TCheetah')
info = re.compile('^owner:(\s)*(?P<owner>\w+)$|group:(\s)*(?P<group>\w+)$|' +
'perms:(\s)*(?P<perms>\w+)$')
class TemplateFile:
'''Template file creates Cheetah template structures for the loaded file'''
def __init__(self, name, properties):
self.name = name
self.properties = properties
self.states = {'template': False, 'info': False}
self.metadata = {'owner': 'root', 'group': '0', 'perms': '644'}
def HandleEvent(self, event):
'''Handle all fs events for this template'''
if event.filename == 'template':
try:
self.template = Cheetah.Template.Template(open(self.name + \
'/template').read())
self.template.properties = self.properties.properties
except Cheetah.Parser.ParseError, perror:
logger.error("Cheetah parse error for file %s" % (self.name))
logger.error(perror.report())
elif event.filename == 'info':
for line in open(self.name + '/info').readlines():
match = info.match(line)
if not match:
logger.warning("Failed to match line: %s"%line)
continue
else:
mgd = match.groupdict()
if mgd['owner']:
self.metadata['owner'] = mgd['owner']
elif mgd['group']:
self.metadata['group'] = mgd['group']
elif mgd['perms']:
self.metadata['perms'] = mgd['perms']
if len(self.metadata['perms']) == 3:
self.metadata['perms'] = "0%s" % (self.metadata['perms'])
def BuildFile(self, entry, metadata):
'''Build literal file information'''
self.template.metadata = metadata
self.template.path = entry.get('name')
self.template.properties = self.properties.properties
try:
entry.text = str(self.template)
except:
logger.error("Failed to template %s" % entry.get('name'))
raise Bcfg2.Server.Plugin.PluginExecutionError
[entry.attrib.__setitem__(key, value) for (key, value) in self.metadata.iteritems()]
class CheetahProperties(Bcfg2.Server.Plugin.SingleXMLFileBacked):
'''Class for Cheetah properties'''
def Index(self):
'''Build data into an elementtree object for templating usage'''
try:
self.properties = lxml.etree.XML(self.data)
del self.data
except lxml.etree.XMLSyntaxError:
logger.error("Failed to parse properties")
class FakeProperties:
'''Dummy class used when properties dont exist'''
def __init__(self):
self.properties = lxml.etree.Element("Properties")
class TCheetah(Bcfg2.Server.Plugin.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):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
if self.data[-1] == '/':
self.data = self.data[:-1]
self.Entries['ConfigFile'] = {}
self.entries = {}
self.handles = {}
self.AddDirectoryMonitor('')
try:
self.properties = CheetahProperties('%s/../etc/properties.xml' \
% (self.data), self.core.fam)
except:
self.properties = FakeProperties()
self.logger.info("Failed to read properties file; TCheetah properties disabled")
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])
if event.filename in ['info', 'template']:
identifier = self.handles[event.requestID][:-1]
else:
identifier = self.handles[event.requestID] + event.filename
if action in ['exists', 'created']:
if posixpath.isdir(epath):
self.AddDirectoryMonitor(epath[len(self.data):])
else:
if not self.entries.has_key(identifier):
self.entries[identifier] = TemplateFile( \
self.data + '/' + identifier, self.properties)
self.Entries['ConfigFile'][identifier] = self.BuildEntry
self.entries[identifier].HandleEvent(event)
elif action == 'changed':
if self.entries.has_key(identifier):
self.entries[identifier].HandleEvent(event)
elif action == 'deleted':
# the template file is the sentinal that creates a real entry
if event.filename == 'template' and 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 posixpath.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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