sfa/server/aggregate.py

   1 ### $Id$
   2 ### $URL$
   3
   4 import os
   5 import sys
   6 import datetime
   7 import time
   8 import xmlrpclib
   9 from types import StringTypes, ListType
  10
  11 from sfa.util.geniserver import GeniServer
  12 from sfa.util.geniclient import GeniClient
  13 from sfa.util.storage import *
  14 from sfa.util.faults import *
  15
  16 # GeniLight client support is optional
  17 try:
  18     from egeni.geniLight_client import *
  19 except ImportError:
  20     GeniClientLight = None
  21
  22
  23 class Aggregate(GeniServer):
  24
  25     ##
  26     # Create a new aggregate object.
  27     #
  28     # @param ip the ip address to listen on
  29     # @param port the port to listen on
  30     # @param key_file private key filename of registry
  31     # @param cert_file certificate filename containing public key (could be a GID file)
  32
  33     def __init__(self, ip, port, key_file, cert_file):
  34         GeniServer.__init__(self, ip, port, key_file, cert_file)
  35         self.server.interface = 'aggregate'
  36
  37 ##
  38 # Aggregates is a dictionary of geniclient aggregate connections keyed on the aggregate hrn
  39
  40 class Aggregates(dict):
  41
  42     required_fields = ['hrn', 'addr', 'port']
  43
  44     def __init__(self, api, file = "/etc/sfa/aggregates.xml"):
  45         dict.__init__(self, {})
  46         self.api = api
  47
  48         # create default connection dict
  49         connection_dict = {}
  50         for field in self.required_fields:
  51             connection_dict[field] = ''
  52         aggregates_dict = {'aggregates': {'aggregate': [connection_dict]}}
  53         # get possible config file locations
  54         loaded = False
  55         path = os.path.dirname(os.path.abspath(__file__))
  56         filename = file.split(os.sep)[-1]
  57         alt_file = path + os.sep + filename
  58         files = [file, alt_file]
  59
  60         for f in files:
  61             try:
  62                 if os.path.isfile(f):
  63                     self.aggregate_info = XmlStorage(f, aggregates_dict)
  64                     loaded = True
  65             except: pass
  66
  67         # if file is missing, just recreate it in the right place
  68         if not loaded:
  69             self.aggregate_info = XmlStorage(file, aggregates_dict)
  70         self.aggregate_info.load()
  71         self.connectAggregates()
  72
  73
  74     def connectAggregates(self):
  75         """
  76         Get connection details for the trusted peer aggregates from file and
  77         create an GeniClient connection to each.
  78         """
  79         aggregates = self.aggregate_info['aggregates']['aggregate']
  80         if isinstance(aggregates, dict):
  81             aggregates = [aggregates]
  82         if isinstance(aggregates, list):
  83             for aggregate in aggregates:
  84                 # make sure the required fields are present
  85                 if not set(self.required_fields).issubset(aggregate.keys()):
  86                     continue
  87                 hrn, address, port = aggregate['hrn'], aggregate['addr'], aggregate['port']
  88                 if not hrn or not address or not port:
  89                     continue
  90                 # check which client we should use
  91                 # geniclient is default
  92                 client_type = 'geniclient'
  93                 if aggregate.has_key('client') and aggregate['client'] in ['geniclientlight']:
  94                     client_type = 'geniclientlight'
  95
  96                 # create url
  97                 url = 'http://%(address)s:%(port)s' % locals()
  98
  99                 # create the client connection
 100                 # make sure module exists before trying to instantiate it
 101                 if client_type in ['geniclientlight'] and GeniClientLight:
 102                     self[hrn] = GeniClientLight(url, self.api.key_file, self.api.cert_file)
 103                 else:
 104                     self[hrn] = GeniClient(url, self.api.key_file, self.api.cert_file)
 105
 106         # set up a connection to the local registry
 107         # connect to registry using GeniClient
 108         address = self.api.config.GENI_AGGREGATE_HOST
 109         port = self.api.config.GENI_AGGREGATE_PORT
 110         url = 'http://%(address)s:%(port)s' % locals()
 111         self[self.api.hrn] = GeniClient(url, self.api.key_file, self.api.cert_file)
 112