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path: root/src/lib/Server/Plugins/SGenshi.py
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'''This module implements a templating generator based on Genshi'''
__revision__ = '$Revision$'

import Bcfg2.Server.Plugin, Bcfg2.Server.Plugins.TGenshi
import lxml.etree, logging

logger = logging.getLogger('Bcfg2.Plugins.SGenshi')

class SGenshiTemplateFile(Bcfg2.Server.Plugins.TGenshi.TemplateFile):
    def get_xml_value(self, metadata):
        stream = self.template.generate(metadata=metadata,
                                        properties=self.properties.properties).filter( \
            Bcfg2.Server.Plugins.TGenshi.removecomment)
        data = stream.render('xml')
        return lxml.etree.XML(data)

class SGenshiEntrySet(Bcfg2.Server.Plugin.EntrySet):
    def __init__(self, path, fam):
        fpattern = '[A-Za-z]+\.xml'
        try:
            properties = Bcfg2.Server.Plugin.TemplateProperties( \
                    '%s/../etc/properties.xml' % (path), fam)
        except:
            properties = Bcfg2.Server.Plugin.FakeProperties()

        Bcfg2.Server.Plugin.EntrySet.__init__(self, fpattern, path,
                                              properties, SGenshiTemplateFile)
        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 Bcfg2.Server.Plugin.PluginExecutionError:
                logger.error("SGenshi: Failed to template file %s" % entry.name)
        return ret

class SGenshi(SGenshiEntrySet, Bcfg2.Server.Plugin.Plugin):
    '''The SGenshi plugin provides templated structures'''
    __name__ = 'SGenshi'
    __version__ = '$Id$'
    __author__ = 'bcfg-dev@mcs.anl.gov'

    def __init__(self, core, datastore):
        Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
        try:
            SGenshiEntrySet.__init__(self, self.data, self.core.fam)
        except:
            logger.error("Failed to load SGenshi repository; disabling SGenshi")
            raise Bcfg2.Server.Plugin.PluginInitError