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 # NOTE: modules listed here should also be loaded in this order
32 known_modules=['net','conf_files', 'sm', 'bwmon']
34 plugin_path = "/usr/share/NodeManager/plugins"
36 parser = optparse.OptionParser()
37 parser.add_option('-d', '--daemon', action='store_true', dest='daemon', default=False, help='run daemonized')
38 parser.add_option('-s', '--startup', action='store_true', dest='startup', default=False, help='run all sliver startup scripts')
39 parser.add_option('-f', '--config', action='store', dest='config', default='/etc/planetlab/plc_config', help='PLC configuration file')
40 parser.add_option('-k', '--session', action='store', dest='session', default='/etc/planetlab/session', help='API session key (or file)')
41 parser.add_option('-p', '--period', action='store', dest='period', default=600, help='Polling interval (sec)')
42 parser.add_option('-r', '--random', action='store', dest='random', default=301, help='Range for additional random polling interval (sec)')
43 parser.add_option('-v', '--verbose', action='store_true', dest='verbose', default=False, help='more verbose log')
44 parser.add_option('-P', '--path', action='store', dest='path', default=plugin_path, help='Path to plugins directory')
46 # NOTE: BUG the 'help' for this parser.add_option() wont list plugins from the --path argument
47 parser.add_option('-m', '--module', action='store', dest='module', default='', help='run a single module among '+' '.join(known_modules))
48 (options, args) = parser.parse_args()
50 # Deal with plugins directory
51 if os.path.exists(options.path):
52 sys.path.append(options.path)
53 known_modules += [i[:-3] for i in os.listdir(options.path) if i.endswith(".py") and (i[:-3] not in known_modules)]
57 def GetSlivers(config, plc):
58 '''Run call backs defined in modules'''
60 logger.log("Syncing w/ PLC")
61 data = plc.GetSlivers()
62 # used to be done only in verbose; very helpful though, and tedious to obtain,
63 # so let's dump this unconditionnally
64 logger.log_slivers(data)
65 getPLCDefaults(data, config)
68 # XXX So some modules can at least boostrap.
69 logger.log("nm: Can't contact PLC to GetSlivers(). Continuing.")
71 # Invoke GetSlivers() functions from the callback modules
72 for module in modules:
74 callback = getattr(module, 'GetSlivers')
75 callback(data, config, plc)
76 except: logger.log_exc()
79 def getPLCDefaults(data, config):
81 Get PLC wide defaults from _default system slice. Adds them to config class.
83 for slice in data.get('slivers'):
84 if slice['name'] == config.PLC_SLICE_PREFIX+"_default":
86 for attr in slice.get('attributes'): attr_dict[attr['tagname']] = attr['value']
87 # GetSlivers exposes the result of GetSliceFamily() as an separate key in data
88 # It is safe to override the attributes with this, as this method has the right logic
90 attr_dict['vref']=slice.get('GetSliceFamily')
94 logger.verbose("Found default slice overrides.\n %s" % attr_dict)
95 config.OVERRIDES = attr_dict
97 # NOTE: if an _default slice existed, it would have been found above and
98 # the routine would return. Thus, if we've gotten here, then no default
99 # slice is bound to this node.
100 if 'OVERRIDES' in dir(config): del config.OVERRIDES
105 if options.daemon: tools.daemon()
108 if (options.verbose):
109 logger.set_level(logger.LOG_VERBOSE)
111 # Load /etc/planetlab/plc_config
112 config = Config(options.config)
115 other_pid = tools.pid_file()
116 if other_pid != None:
117 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)
120 print "Warning while writing PID file:", err
122 # Load and start modules
124 assert options.module in known_modules
125 running_modules=[options.module]
126 logger.verbose('Running single module %s'%options.module)
128 running_modules=known_modules
129 for module in running_modules:
131 m = __import__(module)
132 m.start(options, config)
134 except ImportError, err:
135 print "Warning while loading module %s:" % module, err
137 # Load /etc/planetlab/session
138 if os.path.exists(options.session):
139 session = file(options.session).read().strip()
143 # Initialize XML-RPC client
144 iperiod=int(options.period)
145 irandom=int(options.random)
146 plc = PLCAPI(config.plc_api_uri, config.cacert, session, timeout=iperiod/2)
149 logger.log("Checking Auth.")
150 while plc.check_authentication() != True:
153 logger.log("Authentication Failure. Retrying")
155 logger.log("Retry Failed. Waiting")
157 logger.log("Authentication Succeeded!")
162 logger.verbose('mainloop - nm:getSlivers - period=%d random=%d'%(iperiod,irandom))
163 GetSlivers(config, plc)
164 delay=iperiod + random.randrange(0,irandom)
165 logger.verbose('mainloop - sleeping for %d s'%delay)
167 except: logger.log_exc()
170 if __name__ == '__main__':
171 logger.log("Entering nm.py "+id)
174 # This is for debugging purposes. Open a copy of Python and import nm
175 tools.as_daemon_thread(run)