#
# SFA XML-RPC and SOAP interfaces
#
-### $Id$
-### $URL$
-#
import sys
import os
import traceback
import string
import xmlrpclib
+import sfa.util.xmlrpcprotocol as xmlrpcprotocol
+from sfa.util.sfalogging import logger
from sfa.trust.auth import Auth
from sfa.util.config import *
from sfa.util.faults import *
-from sfa.util.debug import *
+from sfa.util.cache import Cache
from sfa.trust.credential import *
from sfa.trust.certificate import *
-from sfa.util.namespace import *
-from sfa.util.sfalogging import *
# See "2.2 Characters" in the XML specification:
#
mod = getattr(mod, comp)
return mod
+class ManagerWrapper:
+ """
+ This class acts as a wrapper around an SFA interface manager module, but
+ can be used with any python module. The purpose of this class is raise a
+ SfaNotImplemented exception if the a someone attepmts to use an attribute
+ (could be a callable) thats not available in the library by checking the
+ library using hasattr. This helps to communicate better errors messages
+ to the users and developers in the event that a specifiec operation
+ is not implemented by a libarary and will generally be more helpful than
+ the standard AttributeError
+ """
+ def __init__(self, manager, interface):
+ self.manager = manager
+ self.interface = interface
+
+ def __getattr__(self, method):
+
+ if not hasattr(self.manager, method):
+ raise SfaNotImplemented(method, self.interface)
+ return getattr(self.manager, method)
+
class BaseAPI:
- cache = None
protocol = None
def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8",
methods='sfa.methods', peer_cert = None, interface = None,
- key_file = None, cert_file = None, cache = cache):
+ key_file = None, cert_file = None, cache = None):
self.encoding = encoding
# Better just be documenting the API
if config is None:
return
-
# Load configuration
self.config = Config(config)
self.auth = Auth(peer_cert)
self.cert_file = cert_file
self.cert = Certificate(filename=self.cert_file)
self.cache = cache
+ if self.cache is None:
+ self.cache = Cache()
self.credential = None
self.source = None
self.time_format = "%Y-%m-%d %H:%M:%S"
- self.logger=get_sfa_logger()
-
+ self.logger = logger
+
# load registries
from sfa.server.registry import Registries
self.registries = Registries(self)
self.aggregates = Aggregates(self)
- def get_manager(self, manager_base = 'sfa.managers'):
+ def get_interface_manager(self, manager_base = 'sfa.managers'):
"""
Returns the appropriate manager module for this interface.
Modules are usually found in sfa/managers/
manager_module = manager_base + ".component_manager_%s" % mgr_type
else:
raise SfaAPIError("No manager for interface: %s" % self.interface)
- manager = __import__(manager_module, fromlist=[manager_base])
-
+ manager = __import__(manager_module, fromlist=[manager_base])
+ # this isnt necessary but will hlep to produce better error messages
+ # if someone tries to access an operation this manager doesn't implement
+ manager = ManagerWrapper(manager, self.interface)
+
return manager
def callable(self, method):
except SfaFault, fault:
result = fault
except Exception, fault:
- traceback.print_exc(file = log)
+ logger.log_exc("BaseAPI.handle has caught Exception")
result = SfaAPIError(fault)
raise result
return response
+
+ def get_cached_server_version(self, server):
+ cache_key = server.url + "-version"
+ server_version = None
+ if self.cache:
+ server_version = self.cache.get(cache_key)
+ if not server_version:
+ server_version = server.GetVersion()
+ # cache version for 24 hours
+ self.cache.add(cache_key, server_version, ttl= 60*60*24)
+ return server_version