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'''This module implements a templating generator based on Genshi'''
import genshi.input
import genshi.template
import lxml.etree
import logging
import copy
import sys
import os.path
import Bcfg2.Server
import Bcfg2.Server.Plugin
import Bcfg2.Server.Plugins.TGenshi
logger = logging.getLogger('Bcfg2.Plugins.SGenshi')
class SGenshiTemplateFile(Bcfg2.Server.Plugins.TGenshi.TemplateFile,
Bcfg2.Server.Plugin.StructFile):
def __init__(self, name, specific, encoding):
Bcfg2.Server.Plugins.TGenshi.TemplateFile.__init__(self, name,
specific, encoding)
Bcfg2.Server.Plugin.StructFile.__init__(self, name)
def get_xml_value(self, metadata):
if not hasattr(self, 'template'):
logger.error("No parsed template information for %s" % (self.name))
raise Bcfg2.Server.Plugin.PluginExecutionError
try:
stream = self.template.generate(metadata=metadata).filter( \
Bcfg2.Server.Plugins.TGenshi.removecomment)
data = lxml.etree.XML(stream.render('xml', strip_whitespace=False),
parser=Bcfg2.Server.XMLParser)
bundlename = os.path.splitext(os.path.basename(self.name))[0]
bundle = lxml.etree.Element('Bundle', name=bundlename)
for item in self.Match(metadata, data):
bundle.append(copy.deepcopy(item))
return bundle
except LookupError:
lerror = sys.exc_info()[1]
logger.error('Genshi lookup error: %s' % lerror)
except genshi.template.TemplateError:
terror = sys.exc_info()[1]
logger.error('Genshi template error: %s' % terror)
raise
except genshi.input.ParseError:
perror = sys.exc_info()[1]
logger.error('Genshi parse error: %s' % perror)
raise
def Match(self, metadata, xdata):
"""Return matching fragments of parsed template."""
rv = []
for child in xdata.getchildren():
rv.extend(self._match(child, metadata))
logger.debug("File %s got %d match(es)" % (self.name, len(rv)))
return rv
class SGenshiEntrySet(Bcfg2.Server.Plugin.EntrySet):
def __init__(self, path, fam, encoding):
fpattern = '\S+\.xml'
Bcfg2.Server.Plugin.EntrySet.__init__(self, fpattern, path,
SGenshiTemplateFile, encoding)
fam.AddMonitor(path, self)
def HandleEvent(self, event):
'''passthrough event handler for old calling convention'''
if event.filename != self.path:
return self.handle_event(event)
def BuildStructures(self, metadata):
"""Build SGenshi structures."""
ret = []
for entry in self.get_matching(metadata):
try:
ret.append(entry.get_xml_value(metadata))
except:
logger.error("SGenshi: Failed to template file %s" % entry.name)
return ret
class SGenshi(SGenshiEntrySet,
Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Structure):
"""The SGenshi plugin provides templated structures."""
name = 'SGenshi'
__author__ = 'bcfg-dev@mcs.anl.gov'
deprecated = True
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Structure.__init__(self)
try:
SGenshiEntrySet.__init__(self, self.data, self.core.fam, core.encoding)
except:
logger.error("Failed to load %s repository; disabling %s" \
% (self.name, self.name))
raise Bcfg2.Server.Plugin.PluginInitError
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