6 # Useful information can be found at https://svn.planet-lab.org/wiki/NodeManager
9 # Faiyaz Ahmed <faiyaza at cs dot princeton dot edu>
10 # Copyright (C) 2008 The Trustees of Princeton University
28 from config import Config
29 from plcapi import PLCAPI
37 PLUGIN_PATH = "/usr/share/NodeManager/plugins"
39 DB_FILE = "/var/lib/nodemanager/getslivers.pickle"
41 # the modules in this directory that need to be run
42 # NOTE: modules listed here will also be loaded in this order
43 # once loaded, they get re-ordered after their priority (lower comes first)
44 # for determining the runtime order
45 core_modules=['net','conf_files', 'sm', 'bwmon']
53 parser = optparse.OptionParser()
54 parser.add_option('-d', '--daemon', action='store_true', dest='daemon', default=False, help='run daemonized')
55 parser.add_option('-s', '--startup', action='store_true', dest='startup', default=False, help='run all sliver startup scripts')
56 parser.add_option('-f', '--config', action='store', dest='config', default='/etc/planetlab/plc_config', help='PLC configuration file')
57 parser.add_option('-k', '--session', action='store', dest='session', default='/etc/planetlab/session', help='API session key (or file)')
58 parser.add_option('-p', '--period', action='store', dest='period', default=NodeManager.default_period,
59 help='Polling interval (sec) - default %d'%NodeManager.default_period)
60 parser.add_option('-r', '--random', action='store', dest='random', default=NodeManager.default_random,
61 help='Range for additional random polling interval (sec) -- default %d'%NodeManager.default_random)
62 parser.add_option('-v', '--verbose', action='store_true', dest='verbose', default=False, help='more verbose log')
63 parser.add_option('-P', '--path', action='store', dest='path', default=NodeManager.PLUGIN_PATH, help='Path to plugins directory')
65 # NOTE: BUG the 'help' for this parser.add_option() wont list plugins from the --path argument
66 parser.add_option('-m', '--module', action='store', dest='user_module', default='', help='run a single module')
67 (self.options, args) = parser.parse_args()
73 # determine the modules to be run
74 self.modules = NodeManager.core_modules
75 # Deal with plugins directory
76 if os.path.exists(self.options.path):
77 sys.path.append(self.options.path)
78 plugins = [ os.path.split(os.path.splitext(x)[0])[1] for x in glob.glob( os.path.join(self.options.path,'*.py') ) ]
79 self.modules += plugins
80 if self.options.user_module:
81 assert self.options.user_module in self.modules
82 self.modules=[self.options.user_module]
83 logger.verbose('nodemanager: Running single module %s'%self.options.user_module)
86 def GetSlivers(self, config, plc):
87 """Run call backs defined in modules"""
89 logger.log("nodemanager: Syncing w/ PLC")
90 # retrieve GetSlivers from PLC
91 data = plc.GetSlivers()
92 # use the magic 'default' slice to retrieve system-wide defaults
93 self.getPLCDefaults(data, config)
94 # tweak the 'vref' attribute from GetSliceFamily
95 self.setSliversVref (data)
96 # log it for debug purposes, no matter what verbose is
97 logger.log_slivers(data)
98 # dump it too, so it can be retrieved later in case of comm. failure
99 self.dumpSlivers(data)
100 logger.verbose("nodemanager: Sync w/ PLC done")
103 logger.log_exc("nodemanager: failed in GetSlivers")
104 # XXX So some modules can at least boostrap.
105 logger.log("nodemanager: Can't contact PLC to GetSlivers(). Continuing.")
107 # for modules that request it though the 'persistent_data' property
108 last_data=self.loadSlivers()
109 # Invoke GetSlivers() functions from the callback modules
110 for module in self.loaded_modules:
111 logger.verbose('triggering GetSlivers callback for module %s'%module.__name__)
113 callback = getattr(module, 'GetSlivers')
115 if getattr(module,'persistent_data',False):
116 module_data=last_data
117 callback(data, config, plc)
119 logger.log_exc("nodemanager: GetSlivers failed to run callback for module %r"%module)
122 def getPLCDefaults(self, data, config):
124 Get PLC wide defaults from _default system slice. Adds them to config class.
126 for slice in data.get('slivers'):
127 if slice['name'] == config.PLC_SLICE_PREFIX+"_default":
129 for attr in slice.get('attributes'): attr_dict[attr['tagname']] = attr['value']
131 logger.verbose("nodemanager: Found default slice overrides.\n %s" % attr_dict)
132 config.OVERRIDES = attr_dict
134 # NOTE: if an _default slice existed, it would have been found above and
135 # the routine would return. Thus, if we've gotten here, then no default
136 # slice is bound to this node.
137 if 'OVERRIDES' in dir(config): del config.OVERRIDES
140 def setSliversVref (self, data):
142 Tweak the 'vref' attribute in all slivers based on the 'GetSliceFamily' key
144 # GetSlivers exposes the result of GetSliceFamily() as an separate key in data
145 # It is safe to override the attributes with this, as this method has the right logic
146 for sliver in data.get('slivers'):
148 slicefamily=sliver.get('GetSliceFamily')
149 for att in sliver['attributes']:
150 if att['tagname']=='vref':
151 att['value']=slicefamily
153 sliver['attributes'].append({ 'tagname':'vref','value':slicefamily})
155 logger.log_exc("nodemanager: Could not overwrite 'vref' attribute from 'GetSliceFamily'",name=sliver['name'])
157 def dumpSlivers (self, slivers):
158 f = open(NodeManager.DB_FILE, "w")
159 logger.log ("nodemanager: saving successfully fetched GetSlivers in %s" % NodeManager.DB_FILE)
160 pickle.dump(slivers, f)
163 def loadSlivers (self):
165 f = open(NodeManager.DB_FILE, "r+")
166 logger.log("nodemanager: restoring latest known GetSlivers from %s" % NodeManager.DB_FILE)
167 slivers = pickle.load(f)
171 logger.log("Could not restore GetSlivers from %s" % NodeManager.DB_FILE)
176 if self.options.daemon: tools.daemon()
179 if (self.options.verbose):
180 logger.set_level(logger.LOG_VERBOSE)
182 # Load /etc/planetlab/plc_config
183 config = Config(self.options.config)
186 other_pid = tools.pid_file()
187 if other_pid != None:
188 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)
191 print "Warning while writing PID file:", err
194 self.loaded_modules = []
195 for module in self.modules:
197 m = __import__(module)
198 m.start(self.options, config)
199 self.loaded_modules.append(m)
200 except ImportError, err:
201 print "Warning while loading module %s:" % module, err
203 # sort on priority (lower first)
204 def sort_module_priority (m1,m2):
205 return getattr(m1,'priority',NodeManager.default_priority) - getattr(m2,'priority',NodeManager.default_priority)
206 self.loaded_modules.sort(sort_module_priority)
208 logger.log('ordered modules:')
209 for module in self.loaded_modules:
210 logger.log ('%s: %s'%(getattr(module,'priority',NodeManager.default_priority),module.__name__))
212 # Load /etc/planetlab/session
213 if os.path.exists(self.options.session):
214 session = file(self.options.session).read().strip()
220 iperiod=int(self.options.period)
221 irandom=int(self.options.random)
223 # Initialize XML-RPC client
224 plc = PLCAPI(config.plc_api_uri, config.cacert, session, timeout=iperiod/2)
227 logger.log("nodemanager: Checking Auth.")
228 while plc.check_authentication() != True:
231 logger.log("nodemanager: Authentication Failure. Retrying")
233 logger.log("nodemanager: Retry Failed. (%r); Waiting.."%e)
235 logger.log("nodemanager: Authentication Succeeded!")
239 # Main nodemanager Loop
240 logger.log('nodemanager: mainloop - calling GetSlivers - period=%d random=%d'%(iperiod,irandom))
241 self.GetSlivers(config, plc)
242 delay=iperiod + random.randrange(0,irandom)
243 logger.log('nodemanager: mainloop - sleeping for %d s'%delay)
245 except: logger.log_exc("nodemanager: failed in run")
248 logger.log("======================================== Entering nodemanager.py "+NodeManager.id)
251 if __name__ == '__main__':
254 # This is for debugging purposes. Open a copy of Python and import nm
255 tools.as_daemon_thread(run)