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 # Deal with plugins directory
35 plugin_path = "/usr/share/NodeManager/plugins"
36 if os.path.exists(plugin_path):
37 sys.path.append(plugin_path)
38 known_modules += [i[:-3] for i in os.listdir(plugin_path) if i.endswith(".py") and (i[:-3] not in known_modules)]
41 parser = optparse.OptionParser()
42 parser.add_option('-d', '--daemon', action='store_true', dest='daemon', default=False, help='run daemonized')
43 parser.add_option('-s', '--startup', action='store_true', dest='startup', default=False, help='run all sliver startup scripts')
44 parser.add_option('-f', '--config', action='store', dest='config', default='/etc/planetlab/plc_config', help='PLC configuration file')
45 parser.add_option('-k', '--session', action='store', dest='session', default='/etc/planetlab/session', help='API session key (or file)')
46 parser.add_option('-p', '--period', action='store', dest='period', default=600, help='Polling interval (sec)')
47 parser.add_option('-r', '--random', action='store', dest='random', default=301, help='Range for additional random polling interval (sec)')
48 parser.add_option('-v', '--verbose', action='store_true', dest='verbose', default=False, help='more verbose log')
49 parser.add_option('-P', '--path', action='store', dest='path', default=plugin_path, help='Path to plugins directory')
51 # NOTE: BUG the 'help' for this parser.add_option() wont list plugins from the --path argument
52 parser.add_option('-m', '--module', action='store', dest='module', default='', help='run a single module among '+' '.join(known_modules))
53 (options, args) = parser.parse_args()
55 # Deal with plugins directory
56 if os.path.exists(options.path):
57 sys.path.append(options.path)
58 known_modules += [i[:-3] for i in os.listdir(options.path) if i.endswith(".py") and (i[:-3] not in known_modules)]
62 def GetSlivers(plc, config):
63 '''Run call backs defined in modules'''
65 logger.log("Syncing w/ PLC")
66 data = plc.GetSlivers()
67 if (options.verbose): logger.log_slivers(data)
68 getPLCDefaults(data, config)
71 # XXX So some modules can at least boostrap.
72 logger.log("nm: Can't contact PLC to GetSlivers(). Continuing.")
74 # Invoke GetSlivers() functions from the callback modules
75 for module in modules:
77 callback = getattr(module, 'GetSlivers')
78 callback(plc, data, config)
79 except: logger.log_exc()
82 def getPLCDefaults(data, config):
84 Get PLC wide defaults from _default system slice. Adds them to config class.
86 for slice in data.get('slivers'):
87 if slice['name'] == config.PLC_SLICE_PREFIX+"_default":
89 for attr in slice.get('attributes'): attr_dict[attr['tagname']] = attr['value']
91 logger.verbose("Found default slice overrides.\n %s" % attr_dict)
92 config.OVERRIDES = attr_dict
94 if 'OVERRIDES' in dir(config): del config.OVERRIDES
99 if options.daemon: tools.daemon()
102 if (options.verbose):
103 logger.set_level(logger.LOG_VERBOSE)
105 # Load /etc/planetlab/plc_config
106 config = Config(options.config)
109 other_pid = tools.pid_file()
110 if other_pid != None:
111 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)
114 print "Warning while writing PID file:", err
116 # Load and start modules
118 assert options.module in known_modules
119 running_modules=[options.module]
120 logger.verbose('Running single module %s'%options.module)
122 running_modules=known_modules
123 for module in running_modules:
125 m = __import__(module)
126 m.start(options, config)
128 except ImportError, err:
129 print "Warning while loading module %s:" % module, err
131 # Load /etc/planetlab/session
132 if os.path.exists(options.session):
133 session = file(options.session).read().strip()
137 # Initialize XML-RPC client
138 iperiod=int(options.period)
139 irandom=int(options.random)
140 plc = PLCAPI(config.plc_api_uri, config.cacert, session, timeout=iperiod/2)
144 logger.verbose('mainloop - nm:getSlivers - period=%d random=%d'%(iperiod,irandom))
145 GetSlivers(plc, config)
146 delay=iperiod + random.randrange(0,irandom)
147 logger.verbose('mainloop - sleeping for %d s'%delay)
149 except: logger.log_exc()
152 if __name__ == '__main__':
153 logger.log("Entering nm.py "+id)
154 stacklim = 512*1024 # 0.5 MiB
155 curlim = resource.getrlimit(resource.RLIMIT_STACK)[0] # soft limit
156 if curlim > stacklim:
157 resource.setrlimit(resource.RLIMIT_STACK, (stacklim, stacklim))
158 # for some reason, doesn't take effect properly without the exec()
159 python = '/usr/bin/python'
160 os.execv(python, [python] + savedargv)
163 # This is for debugging purposes. Open a copy of Python and import nm
164 tools.as_daemon_thread(run)