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import re, lxml.etree
import Bcfg2.Server.Plugin
class PatternMap(object):
def __init__(self, pattern, groupname):
self.pattern = pattern
self.re = re.compile(pattern)
self.groupname = groupname
def process(self, name):
match = self.re.match(name)
if not match:
return None
ret = self.groupname
sub = match.groups()
for idx in range(len(sub)):
ret = ret.replace('$%s' % (idx+1), sub[idx])
return ret
class PatternFile(Bcfg2.Server.Plugin.SingleXMLFileBacked):
def __init__(self, filename, fam):
Bcfg2.Server.Plugin.SingleXMLFileBacked.__init__(self, filename, fam)
self.patterns = []
def Index(self):
self.patterns = []
try:
parsed = lxml.etree.XML(self.data)
except:
Bcfg2.Server.Plugin.logger.error("Failed to read file %s" % self.name)
return
for entry in parsed.findall('GroupPattern'):
try:
pat = entry.find('NamePattern').text
grp = entry.find('Group').text
self.patterns.append(PatternMap(pat, grp))
except:
Bcfg2.Server.Plugin.logger.error(\
"GroupPatterns: Failed to initialize pattern %s" % \
(entry.get('pattern')))
def process_patterns(self, hostname):
ret = []
for pattern in self.patterns:
try:
gn = pattern.process(hostname)
if gn:
ret.append(gn)
except:
Bcfg2.Server.Plugin.logger.error(\
"GroupPatterns: Failed to process pattern %s for %s" % \
(pattern.pattern, hostname), exc_info=1)
return ret
class GroupPatterns(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Connector):
name = "GroupPatterns"
experimental = True
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Connector.__init__(self)
self.config = PatternFile(self.data + '/config.xml',
core.fam)
def get_additional_groups(self, metadata):
return self.config.process_patterns(metadata.hostname)
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