from sfa.util.sfalogging import logger
from sfa.util.config import Config
-import traceback
-# a bundle is the combination of
+from sfa.managers.managerwrapper import ManagerWrapper
+
+# a bundle is the combination of
# (*) an api that reacts on the incoming requests to trigger the API methods
-# (*) a manager that implements the function of the service,
+# (*) a manager that implements the function of the service,
# either aggregate, registry, or slicemgr
# (*) a driver that controls the underlying testbed
-#
-#
-# The Generic class is a utility that uses the configuration to figure out
-# which combination of these pieces need to be put together
+#
+#
+# The Generic class is a utility that uses the configuration to figure out
+# which combination of these pieces need to be put together
# from config.
# this extra indirection is needed to adapt to the current naming scheme
-# where we have 'pl' and 'plc' and components and the like, that does not
+# where we have 'pl' and 'plc' and components and the like, that does not
# yet follow a sensible scheme
# needs refinements to cache more efficiently, esp. wrt the config
+
class Generic:
- def __init__ (self, config):
- self.config=config
+ def __init__(self, flavour, config):
+ self.flavour = flavour
+ self.config = config
# proof of concept
# example flavour='pl' -> sfa.generic.pl.pl()
@staticmethod
- def the_flavour (flavour=None, config=None):
- if config is None: config=Config()
- if flavour is None: flavour=config.SFA_GENERIC_FLAVOUR
+ def the_flavour(flavour=None, config=None):
+ if config is None:
+ config = Config()
+ if flavour is None:
+ flavour = config.SFA_GENERIC_FLAVOUR
flavour = flavour.lower()
- #mixed = flavour.capitalize()
- module_path="sfa.generic.%s"%flavour
- classname="%s"%flavour
- logger.info("Generic.the_flavour with flavour=%s"%flavour)
+ # mixed = flavour.capitalize()
+ module_path = "sfa.generic.%s" % flavour
+ classname = "%s" % flavour
+ logger.debug("Generic.the_flavour with flavour=%s" % flavour)
try:
- module = __import__ (module_path, globals(), locals(), [classname])
- return getattr(module, classname)(config)
+ module = __import__(module_path, globals(), locals(), [classname])
+ return getattr(module, classname)(flavour, config)
except:
- logger.log_exc("Cannot locate generic instance with flavour=%s"%flavour)
+ logger.log_exc(
+ "Cannot locate generic instance with flavour=%s" % flavour)
+
+ # provide default for importer_class
+ def importer_class(self):
+ return None
+
+ # in the simplest case these can be redefined to the class/module objects to be used
+ # see pl.py for an example
+ # some descendant of SfaApi
+ def api_class(self): pass
+ # the python classes to use to build up the context
+
+ def registry_class(self): pass
+
+ def slicemgr_class(self): pass
+
+ def aggregate_class(self): pass
+
+ def component_class(self): pass
+ # build an API object
+ # insert a manager instance
+ def make_api(self, *args, **kwargs):
+ # interface is a required arg
+ if not 'interface' in kwargs:
+ logger.critical("Generic.make_api: no interface found")
+ api = self.api_class()(*args, **kwargs)
+ # xxx can probably drop support for managers implemented as modules
+ # which makes it a bit awkward
+ manager_class_or_module = self.make_manager(api.interface)
+ driver = self.make_driver(api)
+ # arrange stuff together
+ # add a manager wrapper
+ manager_wrap = ManagerWrapper(
+ manager_class_or_module, api.interface, api.config)
+ api.manager = manager_wrap
+ # add it in api as well; driver.api is set too as part of make_driver
+ api.driver = driver
+ return api
- # how to build an API object
- # default is to use api_class but can be redefined
- def make_api (self, *args, **kwds):
- return self.api_class()(*args, **kwds)
+ def make_manager(self, interface):
+ """
+ interface expected in ['registry', 'aggregate', 'slicemgr', 'component']
+ flavour is e.g. 'pl' or 'max' or whatever
+ """
+ flavour = self.flavour
+ message = "Generic.make_manager for interface=%s and flavour=%s" % (
+ interface, flavour)
+
+ classname = "%s_manager_class" % interface
+ try:
+ module_or_class = getattr(self, classname)()
+ logger.debug("%s : %s" % (message, module_or_class))
+ # this gets passed to ManagerWrapper that will
+ # call the class constructor if it's a class,
+ # or use the module as is if it's a module
+ # so bottom line is, don't try the constructor here
+ return module_or_class
+ except:
+ logger.log_exc_critical(message)
+
+ # need interface to select the right driver
+ def make_driver(self, api):
+ config = api.config
+ interface = api.interface
+ flavour = self.flavour
+ message = "Generic.make_driver for flavour=%s and interface=%s" % (
+ flavour, interface)
+
+ if interface == "component":
+ classname = "component_driver_class"
+ else:
+ classname = "driver_class"
+ try:
+ class_obj = getattr(self, classname)()
+ logger.debug("%s : %s" % (message, class_obj))
+ return class_obj(api)
+ except:
+ logger.log_exc_critical(message)
git://git.onelab.eu / sfa.git / blobdiff