#!/usr/bin/env python '''The XML-RPC Bcfg2 Server''' __revision__ = '$Revision$' import Bcfg2.Server.Plugins.Metadata from Bcfg2.Server.Core import Core, CoreInitError from xmlrpclib import Fault from lxml.etree import XML, Element, tostring import logging, os, select, signal, socket, sys, time import Bcfg2.Logging, Bcfg2.Options, Bcfg2.Component, Bcfg2.Daemon logger = logging.getLogger('bcfg2-server') def critical_error(operation): '''Log and err, traceback and return an xmlrpc fault to client''' logger.error(operation, exc_info=1) raise Fault, (7, "Critical unexpected failure: %s" % (operation)) class SetupError(Exception): '''Used when the server cant be setup''' pass class Bcfg2Serv(Bcfg2.Component.Component): """The Bcfg2 Server component providing XML-RPC access to Bcfg methods""" __name__ = 'bcfg2' __implementation__ = 'bcfg2' fork_funcs = ['GetConfig', 'GetProbes', 'RecvStats'] request_queue_size = 15 def __init__(self, setup): try: Bcfg2.Component.Component.__init__(self, setup['key'], setup['password'], setup['location']) except Bcfg2.Component.ComponentInitError: raise SetupError try: self.Core = Core(setup['repo'], setup['structures'], setup['generators'], setup['password'], setup['svn']) except CoreInitError, msg: logger.critical("Fatal error: %s" % (msg)) raise SystemExit, 1 self.funcs.update({ "AssertProfile" : self.Bcfg2AssertProfile, "GetConfig" : self.Bcfg2GetConfig, "GetProbes" : self.Bcfg2GetProbes, "RecvProbeData" : self.Bcfg2RecvProbeData, "RecvStats" : self.Bcfg2RecvStats }) # init functions to be exposed as XML-RPC functions for plugin in self.Core.plugins.values(): for method in plugin.__rmi__: self.register_function(getattr(self.Core.plugins[plugin.__name__], method), "%s.%s" % (plugin.__name__, method)) famfd = self.Core.fam.fileno() events = False while True: try: rsockinfo = select.select([famfd], [], [], 15)[0] if not rsockinfo: if events: break else: logger.error("Hit event timeout without getting any events; GAMIN/FAM problem?") continue events = True self.Core.Service() except socket.error: continue def get_request(self): '''We need to do work between requests, so select with timeout instead of blocking in accept''' rsockinfo = [] famfd = self.Core.fam.fileno() while self.socket not in rsockinfo: if self.shut: raise socket.error try: rsockinfo = select.select([self.socket, famfd], [], [], 15)[0] except select.error: continue if famfd in rsockinfo: self.Core.Service() if self.socket in rsockinfo: return self.socket.accept() def Bcfg2GetProbes(self, address): '''Fetch probes for a particular client''' resp = Element('probes') try: name = self.Core.metadata.resolve_client(address) meta = self.Core.metadata.get_metadata(name) for plugin in self.Core.plugins.values(): for probe in plugin.GetProbes(meta): resp.append(probe) return tostring(resp) except Bcfg2.Server.Plugins.Metadata.MetadataConsistencyError: warning = 'Client metadata resolution error for %s' % address[0] self.logger.warning(warning) raise Fault, (6, warning) except: critical_error("error determining client probes") def Bcfg2RecvProbeData(self, address, probedata): '''Receive probe data from clients''' try: name = self.Core.metadata.resolve_client(address) meta = self.Core.metadata.get_metadata(name) except Bcfg2.Server.Plugins.Metadata.MetadataConsistencyError: warning = 'metadata consistency error' self.logger.warning(warning) raise Fault, (6, warning) # clear dynamic groups self.Core.metadata.cgroups[meta.hostname] = [] try: xpdata = XML(probedata) except: self.logger.error("Failed to parse probe data from client %s" % (address[0])) return False for data in xpdata: if self.Core.plugins.has_key(data.get('source')): try: self.Core.plugins[data.get('source')].ReceiveData(meta, data) except: self.logger.error("Failed to process probe data from client %s" % (address[0]), exc_info=1) else: self.logger.warning("Failed to locate plugin %s" % (data.get('source'))) return True def Bcfg2AssertProfile(self, address, profile): '''Set profile for a client''' try: client = self.Core.metadata.resolve_client(address) self.Core.metadata.set_profile(client, profile, address) except (Bcfg2.Server.Plugins.Metadata.MetadataConsistencyError, Bcfg2.Server.Plugins.Metadata.MetadataRuntimeError): warning = 'metadata consistency error' self.logger.warning(warning) raise Fault, (6, warning) return True def Bcfg2GetConfig(self, address, _=False, profile=False): '''Build config for a client''' try: client = self.Core.metadata.resolve_client(address) return tostring(self.Core.BuildConfiguration(client)) except Bcfg2.Server.Plugins.Metadata.MetadataConsistencyError: self.logger.warning("Metadata consistency failure for %s" % (address)) raise Fault, (6, "Metadata consistency failure") def Bcfg2RecvStats(self, address, stats): '''Act on statistics upload''' sdata = XML(stats) state = sdata.find(".//Statistics") client = self.Core.metadata.resolve_client(address) meta = self.Core.metadata.get_metadata(client) for i in [1, 2, 3]: # Versioned stats to prevent tied client/server upgrade if state.get('version') >= '2.0': root = Element('ConfigStatistics') stats = Element('Node', name=meta.hostname) stats.append(state) state.set('time', time.asctime(time.localtime())) root.append(stats) filename = "%s/etc/stats-data-%s-%s.xml" % \ (self.Core.datastore, meta.hostname, time.time()) try: fd = os.open(filename, os.O_CREAT|os.O_EXCL|os.O_RDWR) except IOError: if i == 3: self.logger.error("Failed to write statistics file %s" \ % filename) continue data = os.fdopen(fd, 'w') data.write(tostring(root)) data.close() break self.logger.info("Client %s reported state %s" % (client, state.get('state'))) return "" def _authenticate_connection(self, _, user, password, address): return self.Core.metadata.AuthenticateConnection(user, password, address) if __name__ == '__main__': OPTINFO = { 'configfile': Bcfg2.Options.CFILE, 'daemon' : Bcfg2.Options.DAEMON, 'debug' : Bcfg2.Options.DEBUG, 'help' : Bcfg2.Options.HELP, 'verbose' : Bcfg2.Options.VERBOSE, } OPTINFO.update({'repo': Bcfg2.Options.SERVER_REPOSITORY, 'svn': Bcfg2.Options.SERVER_SVN, 'structures': Bcfg2.Options.SERVER_STRUCTURES, 'generators': Bcfg2.Options.SERVER_GENERATORS, 'password': Bcfg2.Options.SERVER_PASSWORD}) OPTINFO.update({'key' : Bcfg2.Options.SERVER_KEY, 'location' : Bcfg2.Options.SERVER_LOCATION, 'passwd' : Bcfg2.Options.SERVER_PASSWORD, 'static' : Bcfg2.Options.SERVER_STATIC, }) setup = Bcfg2.Options.OptionParser(OPTINFO) setup.parse(sys.argv[1:]) print setup level = 0 if setup['daemon']: Bcfg2.Logging.setup_logging('bcfg2-server', to_console=False, level=level) Bcfg2.Daemon.daemonize(setup['daemon']) else: Bcfg2.Logging.setup_logging('bcfg2-server', level=level) if not setup['key']: print "No key specified in '%s'" % setup['configfile'] raise SystemExit, 1 try: BSERV = Bcfg2Serv(setup) except SetupError: raise SystemExit, 1 while not BSERV.shut: try: BSERV.serve_forever() except: critical_error('error in service loop') logger.info("Shutting down")