4 # Useful information can be found at https://svn.planet-lab.org/wiki/NodeManager
7 # Faiyaz Ahmed <faiyaza at cs dot princeton dot edu>
8 # Copyright (C) 2008 The Trustees of Princeton University
24 from config import Config
25 from plcapi import PLCAPI
29 savedargv = sys.argv[:]
31 known_modules=['conf_files', 'sm', 'bwmon', 'vsys', 'codemux']
33 parser = optparse.OptionParser()
34 parser.add_option('-d', '--daemon', action='store_true', dest='daemon', default=False, help='run daemonized')
35 parser.add_option('-s', '--startup', action='store_true', dest='startup', default=False, help='run all sliver startup scripts')
36 parser.add_option('-f', '--config', action='store', dest='config', default='/etc/planetlab/plc_config', help='PLC configuration file')
37 parser.add_option('-k', '--session', action='store', dest='session', default='/etc/planetlab/session', help='API session key (or file)')
38 parser.add_option('-p', '--period', action='store', dest='period', default=600, help='Polling interval (sec)')
39 parser.add_option('-r', '--random', action='store', dest='random', default=301, help='Range for additional random polling interval (sec)')
40 parser.add_option('-v', '--verbose', action='store_true', dest='verbose', default=False, help='more verbose log')
41 parser.add_option('-P', '--path', action='store', dest='path', default='/usr/share/NodeManager/plugins', help='Path to plugins directory')
42 parser.add_option('-m', '--module', action='store', dest='module', default='', help='run a single module among '+' '.join(known_modules))
43 (options, args) = parser.parse_args()
45 # Deal with plugins directory
46 if os.path.exists(options.path):
47 sys.path.append(options.path)
48 known_modules += [i[:-3] for i in os.listdir(options.path) if i.endswith(".py") and (i[:-3] not in known_modules)]
52 def GetSlivers(plc, config):
53 '''Run call backs defined in modules'''
55 logger.log("Syncing w/ PLC")
56 data = plc.GetSlivers()
57 if (options.verbose): logger.log_slivers(data)
58 getPLCDefaults(data, config)
61 # XXX So some modules can at least boostrap.
62 logger.log("nm: Can't contact PLC to GetSlivers(). Continuing.")
64 # Invoke GetSlivers() functions from the callback modules
65 for module in modules:
67 callback = getattr(module, 'GetSlivers')
68 callback(plc, data, config)
69 except: logger.log_exc()
72 def getPLCDefaults(data, config):
74 Get PLC wide defaults from _default system slice. Adds them to config class.
76 for slice in data.get('slivers'):
77 if slice['name'] == config.PLC_SLICE_PREFIX+"_default":
79 for attr in slice.get('attributes'): attr_dict[attr['tagname']] = attr['value']
81 logger.verbose("Found default slice overrides.\n %s" % attr_dict)
82 config.OVERRIDES = attr_dict
84 if 'OVERRIDES' in dir(config): del config.OVERRIDES
89 if options.daemon: tools.daemon()
93 logger.set_level(logger.LOG_VERBOSE)
95 # Load /etc/planetlab/plc_config
96 config = Config(options.config)
99 other_pid = tools.pid_file()
100 if other_pid != None:
101 print """There might be another instance of the node manager running as pid %d. If this is not the case, please remove the pid file %s""" % (other_pid, tools.PID_FILE)
104 print "Warning while writing PID file:", err
106 # Load and start modules
108 assert options.module in known_modules
109 running_modules=[options.module]
110 logger.verbose('Running single module %s'%options.module)
112 running_modules=known_modules
113 for module in running_modules:
115 m = __import__(module)
116 m.start(options, config)
118 except ImportError, err:
119 print "Warning while loading module %s:" % module, err
121 # Load /etc/planetlab/session
122 if os.path.exists(options.session):
123 session = file(options.session).read().strip()
127 # Initialize XML-RPC client
128 iperiod=int(options.period)
129 irandom=int(options.random)
130 plc = PLCAPI(config.plc_api_uri, config.cacert, session, timeout=iperiod/2)
134 logger.verbose('mainloop - nm:getSlivers - period=%d random=%d'%(iperiod,irandom))
135 GetSlivers(plc, config)
136 delay=iperiod + random.randrange(0,irandom)
137 logger.verbose('mainloop - sleeping for %d s'%delay)
139 except: logger.log_exc()
142 if __name__ == '__main__':
143 logger.log("Entering nm.py "+id)
144 stacklim = 512*1024 # 0.5 MiB
145 curlim = resource.getrlimit(resource.RLIMIT_STACK)[0] # soft limit
146 if curlim > stacklim:
147 resource.setrlimit(resource.RLIMIT_STACK, (stacklim, stacklim))
148 # for some reason, doesn't take effect properly without the exec()
149 python = '/usr/bin/python'
150 os.execv(python, [python] + savedargv)
153 # This is for debugging purposes. Open a copy of Python and import nm
154 tools.as_daemon_thread(run)