# Mark Huang <mlhuang@cs.princeton.edu>
#
# Copyright (C) 2004-2006 The Trustees of Princeton University
-# $Id: API.py,v 1.8 2007/01/05 16:09:09 tmack Exp $
+# $Id$
+# $URL$
#
import sys
from PLC.Config import Config
from PLC.Faults import *
import PLC.Methods
+import PLC.Accessors
+
+def import_deep(name):
+ mod = __import__(name)
+ components = name.split('.')
+ for comp in components[1:]:
+ mod = getattr(mod, comp)
+ return mod
class PLCAPI:
- methods = PLC.Methods.methods
+
+ # flat list of method names
+ native_methods = PLC.Methods.native_methods
+
+ # other_methods_map : dict {methodname: fullpath}
+ # e.g. 'Accessors' -> 'PLC.Accessors.Accessors'
+ other_methods_map={}
+ for subdir in [ 'Accessors' ]:
+ path="PLC."+subdir
+ # scan e.g. PLC.Accessors.__all__
+ pkg = __import__(path).__dict__[subdir]
+ for modulename in getattr(pkg,"__all__"):
+ fullpath=path+"."+modulename
+ for method in getattr(import_deep(fullpath),"methods"):
+ other_methods_map[method] = fullpath
+
+ all_methods = native_methods + other_methods_map.keys()
def __init__(self, config = "/etc/planetlab/plc_config", encoding = "utf-8"):
self.encoding = encoding
# Load configuration
self.config = Config(config)
-
- # Initialize database connection
+
+ # Initialize database connection
if self.config.PLC_DB_TYPE == "postgresql":
from PLC.PostgreSQL import PostgreSQL
self.db = PostgreSQL(self)
-
else:
raise PLCAPIError, "Unsupported database type " + self.config.PLC_DB_TYPE
+ # Aspects modify the API injecting code before/after method
+ # calls. As of now we only have aspects for OMF integration,
+ # that's why we enable aspects only if PLC_OMF is set to true.
+ if self.config.PLC_OMF_ENABLED:
+ from aspects import apply_aspects; apply_aspects()
+
+
def callable(self, method):
"""
Return a new instance of the specified method.
"""
# Look up method
- if method not in self.methods:
+ if method not in self.all_methods:
raise PLCInvalidAPIMethod, method
# Get new instance of method
try:
classname = method.split(".")[-1]
- module = __import__("PLC.Methods." + method, globals(), locals(), [classname])
+ if method in self.native_methods:
+ fullpath="PLC.Methods." + method
+ else:
+ fullpath=self.other_methods_map[method]
+ module = __import__(fullpath, globals(), locals(), [classname])
return getattr(module, classname)(self)
except ImportError, AttributeError:
- raise PLCInvalidAPIMethod, method
+ raise PLCInvalidAPIMethod, "import error %s for %s" % (AttributeError,fullpath)
def call(self, source, method, *args):
"""