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'''This file stores persistent metadata for the BCFG Configuration Repository'''
__revision__ = '$Revision$'
from syslog import syslog, LOG_ERR, LOG_INFO
import lxml.etree, os, time, threading
class MetadataConsistencyError(Exception):
'''This error gets raised when metadata is internally inconsistent'''
pass
class MetadataRuntimeError(Exception):
'''This error is raised when the metadata engine is called prior to reading enough data'''
pass
class ClientMetadata(object):
'''This object contains client metadata'''
def __init__(self, client, groups, bundles, toolset):
self.hostname = client
self.bundles = bundles
self.groups = groups
self.toolset = toolset
class Metadata:
'''This class contains data for bcfg2 server metadata'''
__name__ = 'Metadata'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, fam, datastore):
self.data = "%s/%s" % (datastore, self.__name__)
fam.AddMonitor("%s/%s" % (self.data, "groups.xml"), self)
fam.AddMonitor("%s/%s" % (self.data, "clients.xml"), self)
self.states = {'groups.xml':False, 'clients.xml':False}
self.clients = {}
self.aliases = {}
self.groups = {}
self.public = []
self.profiles = []
self.toolsets = {}
self.categories = {}
self.clientdata = None
self.default = None
def HandleEvent(self, event):
'''Handle update events for data files'''
filename = event.filename.split('/')[-1]
if filename not in ['groups.xml', 'clients.xml']:
return
if event.code2str() == 'endExist':
return
try:
xdata = lxml.etree.parse("%s/%s" % (self.data, filename))
except lxml.etree.XMLSyntaxError:
syslog(LOG_ERR, 'Metadata: Failed to parse %s' % (filename))
return
if filename == 'clients.xml':
self.clients = {}
self.aliases = {}
self.clientdata = xdata
for client in xdata.findall('./Client'):
self.clients.update({client.get('name'): client.get('profile')})
[self.aliases.update({alias.get('name'): client.get('name')}) for alias in client.findall('Alias')]
else:
self.public = []
self.profiles = []
self.toolsets = {}
self.groups = {}
grouptmp = {}
self.categories = {}
for group in xdata.findall('./Group'):
grouptmp[group.get('name')] = tuple([[item.get('name') for item in group.findall(spec)]
for spec in ['./Bundle', './Group']])
grouptmp[group.get('name')][1].append(group.get('name'))
if group.get('default', 'false') == 'true':
self.default = group.get('name')
if group.get('profile', 'false') == 'true':
self.profiles.append(group.get('name'))
if group.get('public', 'false') == 'true':
self.public.append(group.get('name'))
if group.attrib.has_key('toolset'):
self.toolsets[group.get('name')] = group.get('toolset')
if group.attrib.has_key('category'):
self.categories[group.get('name')] = group.get('category')
for group in grouptmp:
self.groups[group] = ([], [])
gcategories = []
tocheck = [group]
while tocheck:
now = tocheck.pop()
if now not in self.groups[group][1]:
self.groups[group][1].append(now)
if grouptmp.has_key(now):
(bundles, groups) = grouptmp[now]
for ggg in [ggg for ggg in groups if ggg not in self.groups[group][1]]:
if not self.categories.has_key(ggg) or (self.categories[ggg] not in gcategories):
self.groups[group][1].append(ggg)
tocheck.append(ggg)
if self.categories.has_key(ggg):
gcategories.append(self.categories[ggg])
[self.groups[group][0].append(bund) for bund in bundles
if bund not in self.groups[group][0]]
self.states[filename] = True
if False not in self.states.values():
# check that all client groups are real and complete
real = self.groups.keys()
for client in self.clients.keys():
if self.clients[client] not in real or self.clients[client] not in self.profiles:
syslog(LOG_ERR, "Metadata: Client %s set as nonexistant or incomplete group %s" \
% (client, self.clients[client]))
syslog(LOG_ERR, "Metadata: Removing client mapping for %s" % (client))
del self.clients[client]
def set_group(self, client, group):
'''Set group parameter for provided client'''
if False in self.states.values():
raise MetadataRuntimeError
if group not in self.public:
syslog(LOG_ERR, "Metadata: Failed to set client %s to private group %s" % (client,
group))
raise MetadataConsistencyError
if self.clients.has_key(client):
syslog(LOG_INFO, "Metadata: Changing %s group from %s to %s" % (client,
self.clients[client], group))
cli = self.clientdata.xpath('/Clients/Client[@name="%s"]' % (client))
cli[0].set('group', group)
else:
lxml.etree.SubElement(self.clientdata.getroot(), 'Client', name=client, group=group)
self.clients[client] = group
self.write_back_clients()
def write_back_clients(self):
'''Write changes to client.xml back to disk'''
try:
datafile = open("%s/%s" % (self.data, 'clients.xml'), 'w')
except IOError:
syslog(LOG_ERR, "Metadata: Failed to write clients.xml")
raise MetadataRuntimeError
datafile.write(lxml.etree.tostring(self.clientdata))
datafile.close()
def find_toolset(self, client):
'''Find the toolset for a given client'''
tgroups = [self.toolsets[group] for group in self.groups[client][1] if self.toolsets.has_key(group)]
if len(tgroups) == 1:
return tgroups[0]
elif len(tgroups) == 0:
syslog(LOG_ERR, "Metadata: Couldn't find toolset for client %s" % (client))
raise MetadataConsistencyError
else:
syslog(LOG_ERR, "Metadata: Got goofy toolset result for client %s" % (client))
raise MetadataConsistencyError
def get_config_template(self, client):
'''Build the configuration header for a client configuration'''
return lxml.etree.Element("Configuration", version='2.0', toolset=self.find_toolset(client))
def get_metadata(self, client):
'''Return the metadata for a given client'''
if self.aliases.has_key(client):
client = self.aliases[client]
if self.clients.has_key(client):
[bundles, groups] = self.groups[self.clients[client]]
else:
if self.default == None:
syslog(LOG_ERR, "Cannot set group for client %s; no default group set" % (client))
raise MetadataConsistencyError
[bundles, groups] = self.groups[self.default]
toolinfo = [self.toolsets[group] for group in groups if self.toolsets.has_key(group)]
if len(toolinfo) > 1:
syslog(LOG_ERR, "Metadata: Found multiple toolsets for client %s; choosing one" % (client))
elif len(toolinfo) == 0:
syslog(LOG_ERR, "Metadata: Cannot determine toolset for client %s" % (client))
raise MetadataConsistencyError
toolset = toolinfo[0]
return ClientMetadata(client, groups, bundles, toolset)
def ping_sweep_clients(self):
'''Find live and dead clients'''
live = {}
dead = {}
work = self.clients.keys()
while work:
client = work.pop()
rc = os.system("/bin/ping -w 5 -c 1 %s > /dev/null 2>&1" % client)
if not rc:
live[client] = time.time()
else:
dead[client] = time.time()
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