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'''This provides bundle clauses with translation functionality'''
__revision__ = '$Revision$'
from copy import deepcopy
from syslog import LOG_ERR, syslog
from lxml.etree import Element, XML, XMLSyntaxError
from Bcfg2.Server.Plugin import Plugin, SingleXMLFileBacked, XMLFileBacked, DirectoryBacked
class ImageFile(SingleXMLFileBacked):
'''This file contains image -> system mappings'''
def __init__(self, filename, fam):
self.images = {}
SingleXMLFileBacked.__init__(self, filename, fam)
def Index(self):
'''Build data structures out of the data'''
try:
xdata = XML(self.data)
except XMLSyntaxError, err:
syslog(LOG_ERR, "Failed to parse file %s" % (self.name))
syslog(LOG_ERR, err)
del self.data
return
self.images = {}
for child in xdata.getchildren():
[name, pkg, service] = [child.get(field) for field in ['name', 'package', 'service']]
for grandchild in child.getchildren():
self.images[grandchild.get('name')] = (name, pkg, service)
class Bundle(XMLFileBacked):
'''Bundles are configuration specifications (with image/translation abstraction)'''
def __init__(self, filename):
self.all = []
self.attributes = {}
self.systems = {}
XMLFileBacked.__init__(self, filename)
def Index(self):
'''Build data structures from the source data'''
try:
xdata = XML(self.data)
except XMLSyntaxError, err:
syslog(LOG_ERR, "Failed to parse file %s" % (self.name))
syslog(LOG_ERR, str(err))
del self.data
return
self.all = []
self.systems = {}
self.attributes = {}
for entry in xdata.getchildren():
if entry.tag == 'System':
self.systems[entry.attrib['name']] = entry.getchildren()
elif entry.tag == 'Attribute':
self.attributes[entry.get('name')] = entry.getchildren()
else:
self.all.append(entry)
del self.data
def BuildBundle(self, metadata, system):
'''Build a bundle for a particular client'''
bundlename = self.name.split('/')[-1]
bundle = Element('Bundle', name=bundlename)
for entry in self.all + self.systems.get(system, []):
bundle.append(deepcopy(entry))
for attribute in [aname for (scope, aname) in [item.split('.') for item in metadata.attributes]
if scope == bundlename[:-4]]:
for entry in self.attributes.get(attribute, []):
bundle.append(deepcopy(entry))
return bundle
class BundleSet(DirectoryBacked):
'''The Bundler handles creation of dependent clauses based on bundle definitions'''
__child__ = Bundle
class Bundler(Plugin):
'''The bundler creates dependent clauses based on the bundle/translation scheme from bcfg1'''
__name__ = 'Bundler'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, core, datastore):
Plugin.__init__(self, core, datastore)
self.imageinfo = ImageFile("%s/etc/imageinfo.xml"%(datastore), self.core.fam)
self.bundles = BundleSet(self.data, self.core.fam)
def BuildStructures(self, metadata):
'''Build all structures for client (metadata)'''
try:
(system, package, service) = self.GetTransInfo(metadata)
except KeyError:
syslog(LOG_ERR, "Failed to find translation information for image %s" % metadata.image)
return []
bundleset = []
for bundlename in metadata.bundles:
if not self.bundles.entries.has_key("%s.xml"%(bundlename)):
syslog(LOG_ERR, "Client %s requested nonexistent bundle %s"%(metadata.hostname, bundlename))
continue
bundle = self.bundles.entries["%s.xml" % (bundlename)].BuildBundle(metadata, system)
# now we need to populate service/package types
for entry in bundle.getchildren():
if entry.tag == 'Package':
entry.attrib['type'] = package
elif entry.tag == 'Service':
entry.attrib['type'] = service
bundleset.append(bundle)
return bundleset
def GetTransInfo(self, metadata):
'''Get Translation info for metadata.image'''
if self.imageinfo.images.has_key(metadata.image):
return self.imageinfo.images[metadata.image]
else:
raise KeyError, metadata.image
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