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import jsonrpclib
from jsonrpclib import Fault
import SimpleXMLRPCServer
import SocketServer
import types
import traceback
import fcntl
import sys
def get_version(request):
if type(request) not in (types.ListType, types.DictType):
return None
if type(request) is types.ListType:
if len(request) == 0:
return None
if 'jsonrpc' not in request[0].keys():
return None
return '2.0'
# must be a dict
if 'jsonrpc' in request.keys():
return 2.0
if 'id' in request.keys():
return 1.0
return None
class SimpleJSONRPCDispatcher(SimpleXMLRPCServer.SimpleXMLRPCDispatcher):
def __init__(self, encoding=None):
SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self,
allow_none=True,
encoding=encoding)
def _marshaled_dispatch(self, data, dispatch_method = None):
response = None
try:
request = jsonrpclib.loads(data)
except:
fault = Fault(-32600, 'Request %s invalid.' % data)
response = fault.response()
return response
version = get_version(request)
if not version:
fault = Fault(-32600, 'Request %s invalid.' % data)
response = fault.response()
return response
if type(request) is types.ListType:
# This SHOULD be a batch, by spec
responses = []
for req_entry in request:
resp_entry = self._marshaled_single_dispatch(req_entry)
if resp_entry is not None:
responses.append(resp_entry)
response = '[%s]' % ','.join(responses)
else:
response = self._marshaled_single_dispatch(request)
return response
def _marshaled_single_dispatch(self, request):
# TODO - Use the multiprocessing and skip the response if
# it is a notification
method = request['method']
params = request['params']
# Put in support for custom dispatcher here
# (See SimpleXMLRPCServer._marshaled_dispatch)
try:
response = self._dispatch(method, params)
except:
exc_type, exc_value, exc_tb = sys.exc_info()
fault = Fault(-32603, '%s:%s' % (exc_type, exc_value))
return fault.response()
if 'id' not in request.keys() or request['id'] == None:
# It's a notification
return None
try:
response = jsonrpclib.dumps(response,
methodresponse=True,
rpcid=request['id']
)
return response
except:
exc_type, exc_value, exc_tb = sys.exc_info()
fault = Fault(-32603, '%s:%s' % (exc_type, exc_value))
return fault.response()
def _dispatch(self, method, params):
func = None
try:
func = self.funcs[method]
except KeyError:
if self.instance is not None:
if hasattr(self.instance, '_dispatch'):
return self.instance._dispatch(method, params)
else:
try:
func = resolve_dotted_attribute(
self.instance,
method,
True
)
except AttributeError:
pass
if func is not None:
try:
if type(params) is types.ListType:
response = func(*params)
else:
response = func(**params)
return response
except TypeError:
return Fault(-32602, 'Invalid parameters.')
except:
err_lines = traceback.format_exc().splitlines()
trace_string = '%s | %s' % (err_lines[-3], err_lines[-1])
fault = jsonrpclib.Fault(-32603, 'Server error: %s' %
trace_string)
return fault
else:
return Fault(-32601, 'Method %s not supported.' % method)
class SimpleJSONRPCRequestHandler(
SimpleXMLRPCServer.SimpleXMLRPCRequestHandler):
def do_POST(self):
if not self.is_rpc_path_valid():
self.report_404()
return
try:
max_chunk_size = 10*1024*1024
size_remaining = int(self.headers["content-length"])
L = []
while size_remaining:
chunk_size = min(size_remaining, max_chunk_size)
L.append(self.rfile.read(chunk_size))
size_remaining -= len(L[-1])
data = ''.join(L)
response = self.server._marshaled_dispatch(data)
self.send_response(200)
except Exception, e:
self.send_response(500)
err_lines = traceback.format_exc().splitlines()
trace_string = '%s | %s' % (err_lines[-3], err_lines[-1])
fault = jsonrpclib.Fault(-32603, 'Server error: %s' % trace_string)
response = fault.response()
if response == None:
response = ''
self.send_header("Content-type", "application/json-rpc")
self.send_header("Content-length", str(len(response)))
self.end_headers()
self.wfile.write(response)
self.wfile.flush()
self.connection.shutdown(1)
class SimpleJSONRPCServer(SocketServer.TCPServer,
SimpleJSONRPCDispatcher):
allow_reuse_address = True
def __init__(self, addr, requestHandler=SimpleJSONRPCRequestHandler,
logRequests=True, encoding=None, bind_and_activate=True):
self.logRequests = logRequests
SimpleJSONRPCDispatcher.__init__(self, encoding)
# TCPServer.__init__ has an extra parameter on 2.6+, so
# check Python version and decide on how to call it
vi = sys.version_info
# if python 2.5 and lower
if vi[0] < 3 and vi[1] < 6:
SocketServer.TCPServer.__init__(self, addr, requestHandler)
else:
SocketServer.TCPServer.__init__(self, addr, requestHandler,
bind_and_activate)
if fcntl is not None and hasattr(fcntl, 'FD_CLOEXEC'):
flags = fcntl.fcntl(self.fileno(), fcntl.F_GETFD)
flags |= fcntl.FD_CLOEXEC
fcntl.fcntl(self.fileno(), fcntl.F_SETFD, flags)
class CGIJSONRPCRequestHandler(SimpleJSONRPCDispatcher):
def __init__(self, encoding=None):
SimpleJSONRPCDispatcher.__init__(self, encoding)
def handle_jsonrpc(self, request_text):
response = self._marshaled_dispatch(request_text)
print 'Content-Type: application/json-rpc'
print 'Content-Length: %d' % len(response)
print
sys.stdout.write(response)
handle_xmlrpc = handle_jsonrpc
if __name__ == '__main__':
print 'Running JSON-RPC server on port 8000'
server = SimpleJSONRPCServer(("localhost", 8000))
server.register_function(pow)
server.register_function(lambda x,y: x+y, 'add')
server.serve_forever()
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