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     def __init__(self, ip, port, key_file, cert_file):
  33         GeniServer.__init__(self, ip, port, key_file, cert_file)
  34         self.server.interface = 'aggregate'
  35
  36 ##
  37 # Aggregates is a dictionary of geniclient aggregate connections keyed on the aggregate hrn
  38
  39 class Aggregates(dict):
  40
  41     required_fields = ['hrn', 'addr', 'port']
  42
  43     def __init__(self, api, file = "/etc/sfa/aggregates.xml"):
  44         dict.__init__(self, {})
  45         self.api = api
  46         self.interfaces = []
  47         # create default connection dict
  48         connection_dict = {}
  49         for field in self.required_fields:
  50             connection_dict[field] = ''
  51         aggregates_dict = {'aggregates': {'aggregate': [connection_dict]}}
  52         # get possible config file locations
  53         loaded = False
  54         path = os.path.dirname(os.path.abspath(__file__))
  55         filename = file.split(os.sep)[-1]
  56         alt_file = path + os.sep + filename
  57         files = [file, alt_file]
  58
  59         for f in files:
  60             try:
  61                 if os.path.isfile(f):
  62                     self.aggregate_info = XmlStorage(f, aggregates_dict)
  63                     loaded = True
  64             except: pass
  65
  66         # if file is missing, just recreate it in the right place
  67         if not loaded:
  68             self.aggregate_info = XmlStorage(file, aggregates_dict)
  69         self.aggregate_info.load()
  70         self.connectAggregates()
  71
  72     def connectAggregates(self):
  73         """
  74         Get connection details for the trusted peer aggregates from file and
  75         create an GeniClient connection to each.
  76         """
  77         aggregates = self.aggregate_info['aggregates']['aggregate']
  78         if isinstance(aggregates, dict):
  79             aggregates = [aggregates]
  80         if isinstance(aggregates, list):
  81             for aggregate in aggregates:
  82                 # make sure the required fields are present
  83                 if not set(self.required_fields).issubset(aggregate.keys()):
  84                     continue
  85                 hrn, address, port = aggregate['hrn'], aggregate['addr'], aggregate['port']
  86                 if not hrn or not address or not port:
  87                     continue
  88                 self.interfaces.append(aggregate)
  89                 # check which client we should use
  90                 # geniclient is default
  91                 client_type = 'geniclient'
  92                 if aggregate.has_key('client') and aggregate['client'] in ['geniclientlight']:
  93                     client_type = 'geniclientlight'
  94
  95                 # create url
  96                 url = 'http://%(address)s:%(port)s' % locals()
  97
  98                 # create the client connection
  99                 # make sure module exists before trying to instantiate it
 100                 if client_type in ['geniclientlight'] and GeniClientLight:
 101                     self[hrn] = GeniClientLight(url, self.api.key_file, self.api.cert_file)
 102                 else:
 103                     self[hrn] = GeniClient(url, self.api.key_file, self.api.cert_file)
 104
 105         # set up a connection to the local registry
 106         # connect to registry using GeniClient
 107         address = self.api.config.SFA_AGGREGATE_HOST
 108         port = self.api.config.SFA_AGGREGATE_PORT
 109         url = 'http://%(address)s:%(port)s' % locals()
 110         local_aggregate = {'hrn': self.api.hrn, 'addr': address, 'port': port}
 111         self.interfaces.append(local_aggregate)
 112         self[self.api.hrn] = GeniClient(url, self.api.key_file, self.api.cert_file)
 113
 114