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"""
Copyright (c) 2007 Jan-Klaas Kollhof
This file is part of jsonrpc.
jsonrpc is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This software is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this software; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
from common import *
from jsonrpc import JSONEncodeException
from jsonrpc import dumps
from jsonrpc import loads
from utils import *
def ServiceMethod(fn):
fn.IsServiceMethod = True
return fn
class ServiceException(Exception):
pass
class ServiceRequestNotTranslatable(ServiceException):
pass
class BadServiceRequest(ServiceException):
pass
class ServiceMethodNotFound(ServiceException):
def __init__(self, name):
self.methodName = name
class ServiceHandler(object):
def __init__(self, service):
self.service = service
def handleRequest(self, json):
err = None
result = None
id_ = ''
args = None
try:
req = self.translateRequest(json)
except ServiceRequestNotTranslatable, e:
err = e
req = {'id':id_}
if err == None:
try:
id_ = req['id']
methName = req['method']
try:
args = req['params']
except:
pass
except:
err = BadServiceRequest(json)
module_instance=None
if err == None:
try:
meth = self.locate(methName)
except Exception, e:
err = e
if err == None:
try:
result = self.call(meth, args)
except Exception, e:
err = e
resultdata = self.translateResult(result, err, id_)
return resultdata
def translateRequest(self, data):
try:
req = loads(data)
except:
raise ServiceRequestNotTranslatable(data)
return req
def locate(self, name):
try:
if name.startswith("system."):
return getattr(self, name.split(".")[1])
module_manager = ModuleManager()
modules = module_manager.getAllModules()
for module in modules:
for key in dir(module):
try:
method = getattr(module, key)
if getattr(method, "IsServiceMethod"):
if ("modules."+module.__class__.__name__ + "." + key) == name :
meth = method
break
except AttributeError:
pass
if meth==None :
raise ServiceMethodNotFound(name)
except AttributeError:
raise ServiceMethodNotFound(name)
return meth
def listMethods(self):
results = []
module_manager = ModuleManager()
modules = module_manager.getAllModules()
for module in modules:
for key in dir(module):
method = getattr(module, key)
try:
if getattr(method, "IsServiceMethod"):
results.append("modules."+module.__class__.__name__ + "." + key)
except:
pass
results.sort()
return results
def call(self, meth, args=None):
if args == None :
return meth()
else:
return meth(args) #return meth(*args)
def translateResult(self, rslt, err, id_):
if err != None:
err = {"name": err.__class__.__name__, "message":err.message}
rslt = None
try:
data = dumps({"result":rslt, "id":id_, "error":err})
except JSONEncodeException, e:
err = {"name": "JSONEncodeException", "message":"Result Object Not Serializable"}
data = dumps({"result":None, "id":id_, "error":err})
return data
# --------------------------------------------------------------------
# request dispatcher
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