jsonrpclib/SimpleJSONRPCServer.py

   1 import jsonrpclib
   2 from jsonrpclib import Fault
   3 import SimpleXMLRPCServer
   4 import SocketServer
   5 import types
   6 import traceback
   7 import fcntl
   8 import sys
   9
  10 def get_version(request):
  11     if type(request) not in (types.ListType, types.DictType):
  12         return None
  13     if type(request) is types.ListType:
  14         if len(request) == 0:
  15             return None
  16         if 'jsonrpc' not in request[0].keys():
  17             return None
  18         return '2.0'
  19     # must be a dict
  20     if 'jsonrpc' in request.keys():
  21         return 2.0
  22     if 'id' in request.keys():
  23         return 1.0
  24     return None
  25
  26 class SimpleJSONRPCDispatcher(SimpleXMLRPCServer.SimpleXMLRPCDispatcher):
  27
  28     def __init__(self, encoding=None):
  29         SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self,
  30                                         allow_none=True,
  31                                         encoding=encoding)
  32
  33     def _marshaled_dispatch(self, data, dispatch_method = None):
  34         response = None
  35         try:
  36             request = jsonrpclib.loads(data)
  37         except:
  38             fault = Fault(-32600, 'Request %s invalid.' % data)
  39             response = fault.response()
  40             return response
  41         version = get_version(request)
  42         if not version:
  43             fault = Fault(-32600, 'Request %s invalid.' % data)
  44             response = fault.response()
  45             return response
  46         if type(request) is types.ListType:
  47             # This SHOULD be a batch, by spec
  48             responses = []
  49             for req_entry in request:
  50                 resp_entry = self._marshaled_single_dispatch(req_entry)
  51                 if resp_entry is not None:
  52                     responses.append(resp_entry)
  53             response = '[%s]' % ','.join(responses)
  54         else:
  55             response = self._marshaled_single_dispatch(request)
  56         return response
  57
  58     def _marshaled_single_dispatch(self, request):
  59         # TODO - Use the multiprocessing and skip the response if
  60         # it is a notification
  61         method = request['method']
  62         params = request['params']
  63         # Put in support for custom dispatcher here
  64         # (See SimpleXMLRPCServer._marshaled_dispatch)
  65         try:
  66             response = self._dispatch(method, params)
  67         except:
  68             exc_type, exc_value, exc_tb = sys.exc_info()
  69             fault = Fault(-32603, '%s:%s' % (exc_type, exc_value))
  70             return fault.response()
  71         if 'id' not in request.keys() or request['id'] == None:
  72             # It's a notification
  73             return None
  74         try:
  75             response = jsonrpclib.dumps(response,
  76                                         methodresponse=True,
  77                                         rpcid=request['id']
  78                                         )
  79             return response
  80         except:
  81             exc_type, exc_value, exc_tb = sys.exc_info()
  82             fault = Fault(-32603, '%s:%s' % (exc_type, exc_value))
  83             return fault.response()
  84
  85     def _dispatch(self, method, params):
  86         func = None
  87         try:
  88             func = self.funcs[method]
  89         except KeyError:
  90             if self.instance is not None:
  91                 if hasattr(self.instance, '_dispatch'):
  92                     return self.instance._dispatch(method, params)
  93                 else:
  94                     try:
  95                         func = resolve_dotted_attribute(
  96                             self.instance,
  97                             method,
  98                             True
  99                             )
 100                     except AttributeError:
 101                         pass
 102         if func is not None:
 103             try:
 104                 if type(params) is types.ListType:
 105                     response = func(*params)
 106                 else:
 107                     response = func(**params)
 108                 return response
 109             except TypeError:
 110                 return Fault(-32602, 'Invalid parameters.')
 111             except:
 112                 err_lines = traceback.format_exc().splitlines()
 113                 trace_string = '%s | %s' % (err_lines[-3], err_lines[-1])
 114                 fault = jsonrpclib.Fault(-32603, 'Server error: %s' %
 115                                          trace_string)
 116                 return fault
 117         else:
 118             return Fault(-32601, 'Method %s not supported.' % method)
 119
 120 class SimpleJSONRPCRequestHandler(
 121         SimpleXMLRPCServer.SimpleXMLRPCRequestHandler):
 122
 123     def do_POST(self):
 124         if not self.is_rpc_path_valid():
 125             self.report_404()
 126             return
 127         try:
 128             max_chunk_size = 10*1024*1024
 129             size_remaining = int(self.headers["content-length"])
 130             L = []
 131             while size_remaining:
 132                 chunk_size = min(size_remaining, max_chunk_size)
 133                 L.append(self.rfile.read(chunk_size))
 134                 size_remaining -= len(L[-1])
 135             data = ''.join(L)
 136             response = self.server._marshaled_dispatch(data)
 137             self.send_response(200)
 138         except Exception, e:
 139             self.send_response(500)
 140             err_lines = traceback.format_exc().splitlines()
 141             trace_string = '%s | %s' % (err_lines[-3], err_lines[-1])
 142             fault = jsonrpclib.Fault(-32603, 'Server error: %s' % trace_string)
 143             response = fault.response()
 144         if response == None:
 145             response = ''
 146         self.send_header("Content-type", "application/json-rpc")
 147         self.send_header("Content-length", str(len(response)))
 148         self.end_headers()
 149         self.wfile.write(response)
 150         self.wfile.flush()
 151         self.connection.shutdown(1)
 152
 153 class SimpleJSONRPCServer(SocketServer.TCPServer,
 154                          SimpleJSONRPCDispatcher):
 155
 156     allow_reuse_address = True
 157
 158     def __init__(self, addr, requestHandler=SimpleJSONRPCRequestHandler,
 159                  logRequests=True, encoding=None, bind_and_activate=True):
 160         self.logRequests = logRequests
 161         SimpleJSONRPCDispatcher.__init__(self, encoding)
 162         # TCPServer.__init__ has an extra parameter on 2.6+, so
 163         # check Python version and decide on how to call it
 164         vi = sys.version_info
 165         # if python 2.5 and lower
 166         if vi[0] < 3 and vi[1] < 6:
 167             SocketServer.TCPServer.__init__(self, addr, requestHandler)
 168         else:
 169             SocketServer.TCPServer.__init__(self, addr, requestHandler,
 170                 bind_and_activate)
 171         if fcntl is not None and hasattr(fcntl, 'FD_CLOEXEC'):
 172             flags = fcntl.fcntl(self.fileno(), fcntl.F_GETFD)
 173             flags |= fcntl.FD_CLOEXEC
 174             fcntl.fcntl(self.fileno(), fcntl.F_SETFD, flags)
 175
 176 class CGIJSONRPCRequestHandler(SimpleJSONRPCDispatcher):
 177
 178     def __init__(self, encoding=None):
 179         SimpleJSONRPCDispatcher.__init__(self, encoding)
 180
 181     def handle_jsonrpc(self, request_text):
 182         response = self._marshaled_dispatch(request_text)
 183         print 'Content-Type: application/json-rpc'
 184         print 'Content-Length: %d' % len(response)
 185         print
 186         sys.stdout.write(response)
 187
 188     handle_xmlrpc = handle_jsonrpc
 189
 190 if __name__ == '__main__':
 191     print 'Running JSON-RPC server on port 8000'
 192     server = SimpleJSONRPCServer(("localhost", 8000))
 193     server.register_function(pow)
 194     server.register_function(lambda x,y: x+y, 'add')
 195     server.serve_forever()