#!/usr/bin/python
+#
+# $Id$
+# $URL$
+#
+# Useful information can be found at https://svn.planet-lab.org/wiki/NodeManager
+#
+
+# Faiyaz Ahmed <faiyaza at cs dot princeton dot edu>
+# Copyright (C) 2008 The Trustees of Princeton University
+
"""Node Manager"""
import os
import sys
import resource
+import glob
import logger
import tools
from plcapi import PLCAPI
import random
+id="$Id$"
savedargv = sys.argv[:]
+# NOTE: modules listed here should also be loaded in this order
+# see the priority set in each module - lower comes first
+known_modules=['net','conf_files', 'sm', 'bwmon']
+
+plugin_path = "/usr/share/NodeManager/plugins"
+
+default_period=600
+default_random=301
+
parser = optparse.OptionParser()
parser.add_option('-d', '--daemon', action='store_true', dest='daemon', default=False, help='run daemonized')
parser.add_option('-s', '--startup', action='store_true', dest='startup', default=False, help='run all sliver startup scripts')
parser.add_option('-f', '--config', action='store', dest='config', default='/etc/planetlab/plc_config', help='PLC configuration file')
parser.add_option('-k', '--session', action='store', dest='session', default='/etc/planetlab/session', help='API session key (or file)')
-parser.add_option('-p', '--period', action='store', dest='period', default=600, help='Polling interval (sec)')
+parser.add_option('-p', '--period', action='store', dest='period', default=default_period,
+ help='Polling interval (sec) - default %d'%default_period)
+parser.add_option('-r', '--random', action='store', dest='random', default=default_random,
+ help='Range for additional random polling interval (sec) -- default %d'%default_random)
+parser.add_option('-v', '--verbose', action='store_true', dest='verbose', default=False, help='more verbose log')
+parser.add_option('-P', '--path', action='store', dest='path', default=plugin_path, help='Path to plugins directory')
+
+# NOTE: BUG the 'help' for this parser.add_option() wont list plugins from the --path argument
+parser.add_option('-m', '--module', action='store', dest='module', default='', help='run a single module among '+' '.join(known_modules))
(options, args) = parser.parse_args()
+# Deal with plugins directory
+if os.path.exists(options.path):
+ sys.path.append(options.path)
+ plugins = [ os.path.split(os.path.splitext(x)[0])[1] for x in glob.glob( os.path.join(options.path,'*.py') ) ]
+ known_modules += plugins
+
modules = []
-def GetSlivers(plc):
- data = plc.GetSlivers()
- # net needs access to API for i2 nodes.
+def GetSlivers(config, plc):
+ '''Run call backs defined in modules'''
+ try:
+ logger.log("nm: Syncing w/ PLC")
+ # retrieve GetSlivers from PLC
+ data = plc.GetSlivers()
+ # use the magic 'default' slice to retrieve system-wide defaults
+ getPLCDefaults(data, config)
+ # tweak the 'vref' attribute from GetSliceFamily
+ setSliversVref (data)
+ # always dump it for debug purposes
+ # used to be done only in verbose; very helpful though, and tedious to obtain,
+ # so let's dump this unconditionnally
+ logger.log_slivers(data)
+ logger.verbose("nm: Sync w/ PLC done")
+ except:
+ logger.log_exc("nm: failed in GetSlivers")
+ # XXX So some modules can at least boostrap.
+ logger.log("nm: Can't contact PLC to GetSlivers(). Continuing.")
+ data = {}
+ # Invoke GetSlivers() functions from the callback modules
for module in modules:
- if module.__name__ == 'net':
- module.GetSlivers(plc, data)
- else:
+# logger.log('trigerring GetSlivers callback for module %s'%module.__name__)
+ try:
callback = getattr(module, 'GetSlivers')
- callback(data)
+ callback(data, config, plc)
+ except:
+ logger.log_exc("nm: GetSlivers failed to run callback for module %r"%module)
+
+
+def getPLCDefaults(data, config):
+ '''
+ Get PLC wide defaults from _default system slice. Adds them to config class.
+ '''
+ for slice in data.get('slivers'):
+ if slice['name'] == config.PLC_SLICE_PREFIX+"_default":
+ attr_dict = {}
+ for attr in slice.get('attributes'): attr_dict[attr['tagname']] = attr['value']
+ if len(attr_dict):
+ logger.verbose("nm: Found default slice overrides.\n %s" % attr_dict)
+ config.OVERRIDES = attr_dict
+ return
+ # NOTE: if an _default slice existed, it would have been found above and
+ # the routine would return. Thus, if we've gotten here, then no default
+ # slice is bound to this node.
+ if 'OVERRIDES' in dir(config): del config.OVERRIDES
+
+
+def setSliversVref (data):
+ '''
+ Tweak the 'vref' attribute in all slivers based on the 'GetSliceFamily' key
+ '''
+ # GetSlivers exposes the result of GetSliceFamily() as an separate key in data
+ # It is safe to override the attributes with this, as this method has the right logic
+ for sliver in data.get('slivers'):
+ try:
+ slicefamily=sliver.get('GetSliceFamily')
+ for att in sliver['attributes']:
+ if att['tagname']=='vref':
+ att['value']=slicefamily
+ continue
+ sliver['attributes'].append({ 'tagname':'vref','value':slicefamily})
+ except:
+ logger.log_exc("nm: Could not overwrite 'vref' attribute from 'GetSliceFamily'",name=sliver['name'])
+
def run():
try:
if options.daemon: tools.daemon()
+ # set log level
+ if (options.verbose):
+ logger.set_level(logger.LOG_VERBOSE)
+
# Load /etc/planetlab/plc_config
config = Config(options.config)
print "Warning while writing PID file:", err
# Load and start modules
- for module in ['net', 'proper', 'conf_files', 'sm', 'bwmon']:
+ if options.module:
+ assert options.module in known_modules
+ running_modules=[options.module]
+ logger.verbose('nm: Running single module %s'%options.module)
+ else:
+ running_modules=known_modules
+ for module in running_modules:
try:
m = __import__(module)
m.start(options, config)
except ImportError, err:
print "Warning while loading module %s:" % module, err
+ default_priority=100
+ # sort on priority (lower first)
+ def sort_module_priority (m1,m2):
+ return getattr(m1,'priority',default_priority) - getattr(m2,'priority',default_priority)
+ modules.sort(sort_module_priority)
+
+ logger.verbose('modules priorities and order:')
+ for module in modules: logger.verbose ('%s: %s'%(getattr(module,'priority',default_priority),module.__name__))
+
# Load /etc/planetlab/session
if os.path.exists(options.session):
session = file(options.session).read().strip()
else:
- session = options.session
+ session = None
# Initialize XML-RPC client
- plc = PLCAPI(config.plc_api_uri, config.cacert, session, timeout=options.period/2)
+ iperiod=int(options.period)
+ irandom=int(options.random)
+ plc = PLCAPI(config.plc_api_uri, config.cacert, session, timeout=iperiod/2)
+
+ #check auth
+ logger.log("nm: Checking Auth.")
+ while plc.check_authentication() != True:
+ try:
+ plc.update_session()
+ logger.log("nm: Authentication Failure. Retrying")
+ except:
+ logger.log("nm: Retry Failed. Waiting")
+ time.sleep(iperiod)
+ logger.log("nm: Authentication Succeeded!")
+
while True:
- try: GetSlivers(plc)
- except: logger.log_exc()
- time.sleep(options.period + random.randrange(0,301))
- except: logger.log_exc()
+ # Main NM Loop
+ logger.verbose('nm: mainloop - calling GetSlivers - period=%d random=%d'%(iperiod,irandom))
+ GetSlivers(config, plc)
+ delay=iperiod + random.randrange(0,irandom)
+ logger.verbose('nm: mainloop - sleeping for %d s'%delay)
+ time.sleep(delay)
+ except: logger.log_exc("nm: failed in run")
if __name__ == '__main__':
- stacklim = 512*1024 # 0.5 MiB
- curlim = resource.getrlimit(resource.RLIMIT_STACK)[0] # soft limit
- if curlim > stacklim:
- resource.setrlimit(resource.RLIMIT_STACK, (stacklim, stacklim))
- # for some reason, doesn't take effect properly without the exec()
- python = '/usr/bin/python'
- os.execv(python, [python] + savedargv)
+ logger.log("======================================== Entering nm.py "+id)
run()
else:
# This is for debugging purposes. Open a copy of Python and import nm
git://git.onelab.eu / nodemanager.git / blobdiff