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'''This file stores persistent metadata for the BCFG Configuration Repository'''
__revision__ = '$Revision$'
from elementtree.ElementTree import XML, tostring, SubElement
from Bcfg2.Server.Generator import SingleXMLFileBacked
class ConfigurationRegion(object):
def __init__(self, name, scope, stype):
self.name = name
self.scope = scope
self.stype = stype
class Metadata(object):
'''The Metadata class is a container for all classes of metadata used by Bcfg2'''
def __init__(self, all, image, classes, bundles, attributes, hostname):
self.all = all
self.image = image
self.classes = classes
self.bundles = bundles
self.attributes = attributes
self.hostname = hostname
def Applies(self, other):
'''Applies checks if the object associated with this metadata is relevant to
the metadata supplied by other'''
for c in self.classes:
if c not in other.classes:
return False
for bundle in self.bundles:
if bundle not in other.bundles:
return False
if (self.hostname != None) and (self.hostname != other.hostname):
return False
return True
def __cmp__(self, other):
fields = ['image', 'classes', 'bundles', 'attributes', 'hostname']
sum1 = [x for x in range(len(fields)) if getattr(self, fields[x])][0]
sum2 = [x for x in range(len(fields)) if getattr(other, fields[x])][0]
return sum1 < sum2
class Profile(object):
def __init__(self, xml):
object.__init__(self)
self.classes = [x.attrib['name'] for x in xml.findall("Class")]
self.attributes = ["%s.%s" % (x.attrib['scope'], x.attrib['name']) for x in xml.findall("Attribute")]
class MetadataStore(SingleXMLFileBacked):
def Index(self):
self.element = XML(self.data)
self.defaults = {}
self.clients = {}
self.profiles = {}
self.classes = {}
for p in self.element.findall("Profile"):
self.profiles[p.attrib['name']] = Profile(p)
for c in self.element.findall("Client"):
self.clients[c.attrib['name']] = (c.attrib['image'], c.attrib['profile'])
for c in self.element.findall("Class"):
self.classes[c.attrib['name']] = [x.attrib['name'] for x in c.findall("Bundle")]
for (k, v) in self.element.attrib.iteritems():
if k[:8] == 'default_':
self.defaults[k[8:]] = v
def FetchMetadata(self, client, image=None, profile=None):
if ((image != None) and (profile != None)):
# Client asserted profile/image
self.clients[client] = (image, profile)
f = [x for x in self.element.findall("Client") if x.attrib['name'] == client]
if len(f) == 0:
# non-existent client
SubElement(self.element, "Client", name=client, image=image, profile=profile)
self.WriteBack()
elif len(f) == 1:
# already existing client
f[0].attrib['profile'] = profile
f[0].attrib['image'] = image
self.WriteBack()
elif self.clients.has_key(client):
(image, profile) = self.clients[client]
else:
# default profile stuff goes here
(image, profile) = (self.defaults['image'], self.defaults['profile'])
SubElement(self.element, "Client", name=client, profile=profile, image=image)
self.WriteBack()
p = self.profiles[profile]
# should we uniq here? V
bundles = reduce(lambda x, y:x + y, [self.classes.get(x) for x in p.classes])
return Metadata(False, image, p.classes, bundles, p.attributes, client)
def WriteBack(self):
# write changes to file back to fs
f = open(self.name, 'w')
f.write(tostring(self.element))
f.close()
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