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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
"""
import traceback
from frontend.afe.simplejson import decoder, encoder
def customConvertJson(value):
"""\
Recursively process JSON values and do type conversions.
-change floats to ints
-change unicodes to strs
"""
if isinstance(value, float):
return int(value)
elif isinstance(value, unicode):
return str(value)
elif isinstance(value, list):
return [customConvertJson(item) for item in value]
elif isinstance(value, dict):
new_dict = {}
for key, val in value.iteritems():
new_key = customConvertJson(key)
new_val = customConvertJson(val)
new_dict[new_key] = new_val
return new_dict
else:
return value
json_encoder = encoder.JSONEncoder()
json_decoder = decoder.JSONDecoder()
def ServiceMethod(fn):
fn.IsServiceMethod = True
return fn
class ServiceException(Exception):
pass
class ServiceRequestNotTranslatable(ServiceException):
pass
class BadServiceRequest(ServiceException):
pass
class ServiceMethodNotFound(ServiceException):
pass
class ServiceHandler(object):
def __init__(self, service):
self.service=service
def handleRequest(self, json):
err=None
err_traceback = None
result = None
id_=''
#print 'Request:', json
try:
req = self.translateRequest(json)
except ServiceRequestNotTranslatable, e:
err = e
req={'id':id_}
if err==None:
try:
id_ = req['id']
methName = req['method']
args = req['params']
except:
err = BadServiceRequest(json)
if err == None:
try:
meth = self.findServiceEndpoint(methName)
except Exception, e:
err_traceback = traceback.format_exc()
print err_traceback
err = e
if err == None:
try:
result = self.invokeServiceEndpoint(meth, args)
except Exception, e:
err_traceback = traceback.format_exc()
print err_traceback
err = e
resultdata = self.translateResult(result, err, err_traceback, id_)
return resultdata
def translateRequest(self, data):
try:
req = json_decoder.decode(data)
except:
raise ServiceRequestNotTranslatable(data)
req = customConvertJson(req) # -srh
return req
def findServiceEndpoint(self, name):
try:
meth = getattr(self.service, name)
# -srh
# if getattr(meth, "IsServiceMethod"):
return meth
# else:
# raise ServiceMethodNotFound(name)
except AttributeError:
raise ServiceMethodNotFound(name)
def invokeServiceEndpoint(self, meth, args):
return meth(*args)
def translateResult(self, rslt, err, err_traceback, id_):
if err != None:
err = {"name": err.__class__.__name__, "message":str(err),
"traceback": err_traceback}
rslt = None
try:
data = json_encoder.encode({"result":rslt,"id":id_,"error":err})
except TypeError, e:
err_traceback = traceback.format_exc()
print err_traceback
err = {"name" : "JSONEncodeException",
"message" : "Result Object Not Serializable",
"traceback" : err_traceback}
data = json_encoder.encode({"result":None, "id":id_,"error":err})
return data
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