geni/registry.py

   1 #
   2 # Registry is a GeniServer that implements the Registry interface
   3 #
   4 ### $Id$
   5 ### $URL$
   6 #
   7
   8 import tempfile
   9 import os
  10 import time
  11 import sys
  12
  13 from geni.util.geniserver import GeniServer
  14 from geni.util.geniclient import GeniClient
  15 # GeniLight client support is optional
  16 try:
  17     from egeni.geniLight_client import *
  18 except ImportError:
  19     GeniClientLight = None
  20 from geni.util.genitable import GeniTable
  21 from geni.util.faults import *
  22 from geni.util.storage import *
  23
  24 ##
  25 # Registry is a GeniServer that serves registry and slice operations at PLC.
  26
  27 class Registry(GeniServer):
  28     ##
  29     # Create a new registry object.
  30     #
  31     # @param ip the ip address to listen on
  32     # @param port the port to listen on
  33     # @param key_file private key filename of registry
  34     # @param cert_file certificate filename containing public key (could be a GID file)
  35
  36     def __init__(self, ip, port, key_file, cert_file):
  37         GeniServer.__init__(self, ip, port, key_file, cert_file)
  38         self.server.interface = 'registry'
  39
  40
  41 ##
  42 # Registries is a dictionary of geniclient registry connections keyed on the registry
  43 # hrn
  44
  45 class Registries(dict):
  46
  47     required_fields = ['hrn', 'addr', 'port']
  48
  49     def __init__(self, api, file = "/etc/sfa/registries.xml"):
  50         dict.__init__(self, {})
  51         self.api = api
  52
  53         # create default connection dict
  54         connection_dict = {}
  55         for field in self.required_fields:
  56             connection_dict[field] = ''
  57         registries_dict = {'registries': {'registry': [connection_dict]}}
  58
  59         # get possible config file locations
  60         loaded = False
  61         path = os.path.dirname(os.path.abspath(__file__))
  62         filename = file.split(os.sep)[-1]
  63         alt_file = path + os.sep + filename
  64         files = [file, alt_file]
  65
  66         for f in files:
  67             try:
  68                 if os.path.isfile(f):
  69                     self.registry_info = XmlStorage(f, registries_dict)
  70                     loaded = True
  71             except: pass
  72
  73         # if file is missing, just recreate it in the right place
  74         if not loaded:
  75             self.registry_info = XmlStorage(file, registries_dict)
  76         self.registry_info.load()
  77         self.connectRegistries()
  78
  79     def connectRegistries(self):
  80         """
  81         Get connection details for the trusted peer registries from file and
  82         create an GeniClient connection to each.
  83         """
  84         registries = self.registry_info['registries']['registry']
  85         if isinstance(registries, dict):
  86             registries = [registries]
  87         if isinstance(registries, list):
  88             for registry in registries:
  89                 # make sure the required fields are present
  90                 if not set(self.required_fields).issubset(registry.keys()):
  91                     continue
  92                 hrn, address, port = registry['hrn'], registry['addr'], registry['port']
  93                 if not hrn or not address or not port:
  94                     continue
  95
  96                 # check which client we should use
  97                 # geniclient is default
  98                 client_type = 'geniclient'
  99                 if registry.has_key('client') and registry['client'] in ['geniclientlight']:
 100                     client_type = 'geniclientlight'
 101
 102                 # create url
 103                 url = 'http://%(address)s:%(port)s' % locals()
 104
 105                 # create the client connection
 106                 # make sure module exists before trying to instantiate it
 107                 if client_type in ['geniclientlight'] and GeniClientLight:
 108                     self[hrn] = GeniClientLight(url, self.api.key_file, self.api.cert_file)
 109                 else:
 110                     self[hrn] = GeniClient(url, self.api.key_file, self.api.cert_file)
 111
 112         # set up a connection to the local registry
 113         # connect to registry using GeniClient
 114         address = self.api.config.GENI_REGISTRY_HOST
 115         port = self.api.config.GENI_REGISTRY_PORT
 116         url = 'http://%(address)s:%(port)s' % locals()
 117         self[self.api.hrn] = GeniClient(url, self.api.key_file, self.api.cert_file)
 118