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#!/usr/bin/env python
# $Id: $
'''Bcfg2 Server'''
__revision__ = '$Revision'
from getopt import getopt, GetoptError
from socket import gethostbyaddr, herror
from syslog import openlog, syslog, LOG_INFO, LOG_ERR, LOG_LOCAL0
from sys import argv, exit as sysexit, exc_info
from traceback import extract_tb
from elementtree.ElementTree import Element
from Bcfg2.Server.Core import Core, CoreInitError
from Bcfg2.Server.Metadata import MetadataConsistencyError
from sss.daemonize import daemonize
from sss.server import Server
def dgetopt(arglist, opt, vopt):
'''parse options into a dictionary'''
ret = {}
for optname in opt.values() + vopt.values():
ret[optname] = False
gstr = "".join(opt.keys()) + "".join([xy+':' for xy in vopt.keys()])
try:
(o, a) = getopt(arglist, gstr)
except GetoptError, gerr:
print gerr
print "bcfg2 Usage:"
for arg in opt.iteritems():
print " -%s %s" % arg
for arg in vopt.iteritems():
print " -%s <%s>" % arg
sysexit(1)
for (gopt, garg) in o:
option = gopt[1:]
if opt.has_key(option):
ret[opt[option]] = True
else:
ret[vopt[option]] = garg
return ret
class BcfgServer(Server):
'''Bcfg2 Server Class'''
__implementation__ = 'Bcfg2'
__component__ = 'bcfg2'
__dispatch__ = {'get-config':'BuildConfig', 'get-probes':'get_probes', 'probe-data':'put_probe_data', 'upload-statistics':'HandleStats'}
__validate__ = 0
def __setup__(self):
self.setup = self.kwargs['setup']
try:
self.core = Core(setup, self.kwargs.get('configfile', '/etc/bcfg2.conf'))
except CoreInitError, msg:
syslog(LOG_ERR, msg)
print msg
raise SystemExit, 1
self.__progress__()
def __progress__(self):
try:
while self.core.fam.fm.pending():
self.core.fam.HandleEvent()
except:
self.LogFailure("FileEvent")
try:
self.core.stats.WriteBack()
except:
self.LogFailure("Statistics")
return 0
def __shutdown__(self):
# Update Statistics on shutdown
self.core.stats.WriteBack()
def BuildConfig(self, xml, (peer, port)):
'''Build Client Config'''
# find client info
if setup['client']:
client = setup['client']
else:
try:
client = gethostbyaddr(peer)[0]
except herror:
return Element("error", type='host resolution error')
if xml.attrib.has_key("profile") and xml.attrib.has_key("image"):
try:
# if metadata is provided, call FetchMetadata with settings
# it is screwey. i know.
meta = self.core.metadata.FetchMetadata(client, image=xml.attrib['image'],
profile=xml.attrib['profile'])
except MetadataConsistencyError:
syslog(LOG_ERR, "Metadata consistency error for client %s" % client)
return Element("error", type='metadata error')
return self.core.BuildConfiguration(client)
def get_probes(self, xml, (peer, port)):
'''Get Probes for Client'''
r = Element('probes')
try:
client = gethostbyaddr(peer)[0]
except herror:
return Element("error", type='host resolution error')
try:
m = self.core.metadata.FetchMetadata(client)
except MetadataConsistencyError:
return Element("error", type='metadata resolution error')
for g in self.core.generators:
for p in g.GetProbes(m):
r.append(p)
return r
def put_probe_data(self, xml, (peer, port)):
'''Return Probe output to generators'''
try:
client = gethostbyaddr(peer)[0]
except herror:
return Element("error", type='host resolution error')
for data in xml.findall(".//probe-data"):
try:
[g] = [x for x in self.core.generators if x.__name__ == data.attrib['source']]
g.ReceiveData(client, data)
except:
self.LogFailure("put_probe_data")
return Element("OK")
def HandleStats(self, xml, (peer, port)):
'''Act on statistics upload'''
e = xml.find(".//Statistics")
# Versioned stats to prevent tied client/server upgrade
if e.get('version') >= '2.0':
try:
client = gethostbyaddr(peer)[0]
except herror:
return Element("error", type='host resolution error')
# Update statistics
self.core.stats.updateStats(xml, client)
syslog(LOG_INFO, "Client %s reported state %s"%(peer, e.attrib['state']))
return Element("ok")
def LogFailure(self, failure):
'''Log Failures in unexpected cases'''
(t, v, tb)=exc_info()
syslog(LOG_ERR, "Unexpected failure in %s"%(failure))
for line in extract_tb(tb):
syslog(LOG_ERR, ' File "%s", line %i, in %s\n %s\n'%line)
syslog(LOG_ERR, "%s: %s\n"%(t, v))
del t, v, tb
if __name__ == '__main__':
openlog("Bcfg2", 0, LOG_LOCAL0)
options = {'v':'verbose', 'd':'debug'}
doptions = {'D':'daemon', 'C':'client'}
setup = dgetopt(argv[1:], options, doptions)
if setup['daemon']:
daemonize(setup['daemon'])
server = BcfgServer(setup=setup)
for i in range(10):
server.__progress__()
server.ServeForever()
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