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
35 PLUGIN_PATH = "/usr/share/NodeManager/plugins"
37 DB_FILE = "/var/lib/nodemanager/getslivers.pickle"
39 # the modules in this directory that need to be run
40 # NOTE: modules listed here will also be loaded in this order
41 # once loaded, they get re-ordered after their priority (lower comes first)
42 # for determining the runtime order
43 core_modules=['net', 'conf_files', 'slivermanager', 'bwmon']
51 parser = optparse.OptionParser()
52 parser.add_option('-d', '--daemon', action='store_true', dest='daemon', default=False,
53 help='run daemonized')
54 parser.add_option('-f', '--config', action='store', dest='config', default='/etc/planetlab/plc_config',
55 help='PLC configuration file')
56 parser.add_option('-k', '--session', action='store', dest='session', default='/etc/planetlab/session',
57 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,
63 help='more verbose log')
64 parser.add_option('-P', '--path', action='store', dest='path', default=NodeManager.PLUGIN_PATH,
65 help='Path to plugins directory')
67 # NOTE: BUG the 'help' for this parser.add_option() wont list plugins from the --path argument
68 parser.add_option('-m', '--module', action='store', dest='user_module', default='', help='run a single module')
69 (self.options, args) = parser.parse_args()
75 # determine the modules to be run
76 self.modules = NodeManager.core_modules
77 # Deal with plugins directory
78 if os.path.exists(self.options.path):
79 sys.path.append(self.options.path)
80 plugins = [ os.path.split(os.path.splitext(x)[0])[1] for x in glob.glob( os.path.join(self.options.path,'*.py') ) ]
81 self.modules += plugins
82 if self.options.user_module:
83 assert self.options.user_module in self.modules
84 self.modules=[self.options.user_module]
85 logger.verbose('nodemanager: Running single module %s'%self.options.user_module)
88 def GetSlivers(self, config, plc):
89 """Retrieves GetSlivers at PLC and triggers callbacks defined in modules/plugins"""
91 logger.log("nodemanager: Syncing w/ PLC")
92 # retrieve GetSlivers from PLC
93 data = plc.GetSlivers()
94 # use the magic 'default' slice to retrieve system-wide defaults
95 self.getPLCDefaults(data, config)
96 # tweak the 'vref' attribute from GetSliceFamily
97 self.setSliversVref (data)
98 # check leases and adjust the 'alive' field in slivers
99 self.adjustReservedSlivers (data)
100 # dump it too, so it can be retrieved later in case of comm. failure
101 self.dumpSlivers(data)
102 # log it for debug purposes, no matter what verbose is
103 logger.log_slivers(data)
104 logger.verbose("nodemanager: Sync w/ PLC done")
107 logger.log_exc("nodemanager: failed in GetSlivers")
108 # XXX So some modules can at least boostrap.
109 logger.log("nodemanager: Can't contact PLC to GetSlivers(). Continuing.")
111 # for modules that request it though the 'persistent_data' property
112 last_data=self.loadSlivers()
113 # adjust again with current time
114 self.adjustReservedSlivers (data)
115 # Invoke GetSlivers() functions from the callback modules
116 for module in self.loaded_modules:
117 logger.verbose('nodemanager: triggering %s.GetSlivers'%module.__name__)
119 callback = getattr(module, 'GetSlivers')
121 if getattr(module,'persistent_data',False):
122 module_data=last_data
123 callback(data, config, plc)
125 logger.log_exc("nodemanager: GetSlivers failed to run callback for module %r"%module)
128 def getPLCDefaults(self, data, config):
130 Get PLC wide defaults from _default system slice. Adds them to config class.
132 for slice in data.get('slivers'):
133 if slice['name'] == config.PLC_SLICE_PREFIX+"_default":
135 for attr in slice.get('attributes'): attr_dict[attr['tagname']] = attr['value']
137 logger.verbose("nodemanager: Found default slice overrides.\n %s" % attr_dict)
138 config.OVERRIDES = attr_dict
140 # NOTE: if an _default slice existed, it would have been found above and
141 # the routine would return. Thus, if we've gotten here, then no default
142 # slice is bound to this node.
143 if 'OVERRIDES' in dir(config): del config.OVERRIDES
146 def setSliversVref (self, data):
148 Tweak the 'vref' attribute in all slivers based on the 'GetSliceFamily' key
150 # GetSlivers exposes the result of GetSliceFamily() as an separate key in data
151 # It is safe to override the attributes with this, as this method has the right logic
152 for sliver in data.get('slivers'):
154 slicefamily=sliver.get('GetSliceFamily')
155 for att in sliver['attributes']:
156 if att['tagname']=='vref':
157 att['value']=slicefamily
159 sliver['attributes'].append({ 'tagname':'vref','value':slicefamily})
161 logger.log_exc("nodemanager: Could not overwrite 'vref' attribute from 'GetSliceFamily'",name=sliver['name'])
163 def adjustReservedSlivers (self, data):
165 On reservable nodes, tweak the 'alive' field to instruct cyclic loop
166 about what to do with slivers.
170 def dumpSlivers (self, slivers):
171 f = open(NodeManager.DB_FILE, "w")
172 logger.log ("nodemanager: saving successfully fetched GetSlivers in %s" % NodeManager.DB_FILE)
173 pickle.dump(slivers, f)
176 def loadSlivers (self):
178 f = open(NodeManager.DB_FILE, "r+")
179 logger.log("nodemanager: restoring latest known GetSlivers from %s" % NodeManager.DB_FILE)
180 slivers = pickle.load(f)
184 logger.log("Could not restore GetSlivers from %s" % NodeManager.DB_FILE)
189 if self.options.daemon: tools.daemon()
192 if (self.options.verbose):
193 logger.set_level(logger.LOG_VERBOSE)
195 # Load /etc/planetlab/plc_config
196 config = Config(self.options.config)
199 other_pid = tools.pid_file()
200 if other_pid != None:
201 print """There might be another instance of the node manager running as pid %d.
202 If this is not the case, please remove the pid file %s. -- exiting""" % (other_pid, tools.PID_FILE)
205 print "Warning while writing PID file:", err
208 self.loaded_modules = []
209 for module in self.modules:
211 m = __import__(module)
212 logger.verbose("nodemanager: triggering %s.start"%m.__name__)
213 m.start(self.options, config)
214 self.loaded_modules.append(m)
215 except ImportError, err:
216 print "Warning while loading module %s:" % module, err
218 # sort on priority (lower first)
219 def sort_module_priority (m1,m2):
220 return getattr(m1,'priority',NodeManager.default_priority) - getattr(m2,'priority',NodeManager.default_priority)
221 self.loaded_modules.sort(sort_module_priority)
223 logger.log('ordered modules:')
224 for module in self.loaded_modules:
225 logger.log ('%s: %s'%(getattr(module,'priority',NodeManager.default_priority),module.__name__))
227 # Load /etc/planetlab/session
228 if os.path.exists(self.options.session):
229 session = file(self.options.session).read().strip()
235 iperiod=int(self.options.period)
236 irandom=int(self.options.random)
238 # Initialize XML-RPC client
239 plc = PLCAPI(config.plc_api_uri, config.cacert, session, timeout=iperiod/2)
242 logger.log("nodemanager: Checking Auth.")
243 while plc.check_authentication() != True:
246 logger.log("nodemanager: Authentication Failure. Retrying")
248 logger.log("nodemanager: Retry Failed. (%r); Waiting.."%e)
250 logger.log("nodemanager: Authentication Succeeded!")
254 # Main nodemanager Loop
255 logger.log('nodemanager: mainloop - calling GetSlivers - period=%d random=%d'%(iperiod,irandom))
256 self.GetSlivers(config, plc)
257 delay=iperiod + random.randrange(0,irandom)
258 logger.log('nodemanager: mainloop - sleeping for %d s'%delay)
260 except: logger.log_exc("nodemanager: failed in run")
263 logger.log("======================================== Entering nodemanager.py")
266 if __name__ == '__main__':
269 # This is for debugging purposes. Open a copy of Python and import nodemanager
270 tools.as_daemon_thread(run)