# Mark Huang <mlhuang@cs.princeton.edu>
#
# Copyright (C) 2004-2006 The Trustees of Princeton University
-# $Id$
#
+import os
import sys
import traceback
import string
import xmlrpclib
+import simplejson
+try:
+ # Try to use jsonlib before using simpljson. This is a hack to get around
+ # the fact that the version of simplejson avaialble for f8 is slightly
+ # faster than xmlrpc but not as fast as jsonlib. There is no jsonlib
+ # pacakge available for f8, so this has to be installed manually and
+ # is not expected to always be available. Remove this once we move away
+ # from f8 based MyPLC's
+ import jsonlib
+ json = jsonlib
+except:
+ json = simplejson
# See "2.2 Characters" in the XML specification:
#
from PLC.Config import Config
from PLC.Faults import *
import PLC.Methods
-import PLC.Legacy
+import PLC.Accessors
def import_deep(name):
mod = __import__(name)
class PLCAPI:
# flat list of method names
- methods = PLC.Methods.methods
+ 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
- # dict {methodname:module}
- legacy_map={}
- for module in PLC.Legacy.__all__ :
- for method in getattr(import_deep("PLC.Legacy."+module),"methods"):
- legacy_map[method]=module
+ all_methods = native_methods + other_methods_map.keys()
- all_methods = methods+legacy_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 by injecting code before, after or
+ # around method calls. -- http://github.com/baris/pyaspects/blob/master/README
+ #
+ # 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_omf_aspect
+ apply_omf_aspect()
+
+ if self.config.PLC_RATELIMIT_ENABLED:
+ from aspects import apply_ratelimit_aspect
+ apply_ratelimit_aspect()
+
+
+ # Enable Caching. Only for GetSlivers for the moment.
+ # TODO: we may consider to do this in an aspect like the ones above.
+ try:
+ if self.config.PLC_GETSLIVERS_CACHE:
+ getslivers_cache = True
+ except AttributeError:
+ getslivers_cache = False
+
+ if getslivers_cache:
+ os.environ['DJANGO_SETTINGS_MODULE']='plc_django_settings'
+ from cache_utils.decorators import cached
+ from PLC.Methods.GetSlivers import GetSlivers
+
+ @cached(7200)
+ def cacheable_call(cls, auth, node_id_or_hostname):
+ return cls.raw_call(auth, node_id_or_hostname)
+
+ GetSlivers.call = cacheable_call
+
+
+
def callable(self, method):
"""
Return a new instance of the specified method.
# Look up method
if method not in self.all_methods:
raise PLCInvalidAPIMethod, method
-
+
# Get new instance of method
try:
classname = method.split(".")[-1]
- if method in self.methods:
- module = __import__("PLC.Methods." + method, globals(), locals(), [classname])
- return getattr(module, classname)(self)
+ if method in self.native_methods:
+ fullpath="PLC.Methods." + method
else:
- modulename=self.legacy_map[method]
- module = __import__("PLC.Legacy." + modulename, globals(), locals(), [classname])
- return getattr(module, classname)(self)
+ 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):
"""
data = buildSOAP(kw = {'%sResponse' % method: {'Result': result}}, encoding = self.encoding)
return data
+
+ def handle_json(self, source, data):
+ """
+ Handle a JSON request
+ """
+ method, args = json.loads(data)
+ try:
+ result = self.call(source, method, *args)
+ except Exception, e:
+ result = str(e)
+
+ return json.dumps(result)
+
+