2 JSONRPCLIB -- started by Josh Marshall
4 This library is a JSON-RPC v.2 (proposed) implementation which
5 follows the xmlrpclib API for portability between clients. It
6 uses the same Server / ServerProxy, loads, dumps, etc. syntax,
7 while providing features not present in XML-RPC like:
12 * Batches and batch notifications
14 Eventually, I'll add a SimpleXMLRPCServer compatible library,
15 and other things to tie the thing off nicely. :)
17 For a quick-start, just open a console and type the following,
18 replacing the server address, method, and parameters
21 >>> server = jsonrpclib.Server('http://localhost:8181')
24 >>> jsonrpclib.__notify('add', (5, 6))
26 See http://code.google.com/p/jsonrpclib/ for more info.
31 from xmlrpclib import Transport as XMLTransport
32 from xmlrpclib import SafeTransport as XMLSafeTransport
33 from xmlrpclib import ServerProxy as XMLServerProxy
34 from xmlrpclib import _Method as XML_Method
37 # JSON library importing
49 if not cjson and not json:
51 import simplejson as json
53 raise ImportError('You must have the cjson, json, or simplejson ' +
54 'module(s) available.')
60 _user_agent = 'jsonrpclib/0.1 (Python %s)' % \
61 '.'.join([str(ver) for ver in sys.version_info[0:3]])
65 def jdumps(obj, encoding='utf-8'):
66 # Do 'serialize' test at some point for other classes
69 return cjson.encode(obj)
71 return json.dumps(obj, encoding=encoding)
73 def jloads(json_string):
76 return cjson.decode(json_string)
78 return json.loads(json_string)
81 # XMLRPClib re-implemntations
83 class ProtocolError(Exception):
86 class Transport(XMLTransport):
87 """ Just extends the XMLRPC transport where necessary. """
88 user_agent = _user_agent
90 def send_content(self, connection, request_body):
91 connection.putheader("Content-Type", "text/json")
92 connection.putheader("Content-Length", str(len(request_body)))
93 connection.endheaders()
95 connection.send(request_body)
97 def _parse_response(self, file_h, sock):
101 response = sock.recv(1024)
103 response = file_h.read(1024)
107 print 'body: %s' % response
108 response_body += response
109 if response_body == '':
112 return_obj = loads(response_body)
115 class SafeTransport(XMLSafeTransport):
116 """ Just extends for HTTPS calls """
117 user_agent = Transport.user_agent
118 send_content = Transport.send_content
119 _parse_response = Transport._parse_response
121 class ServerProxy(XMLServerProxy):
123 Unfortunately, much more of this class has to be copied since
124 so much of it does the serialization.
127 def __init__(self, uri, transport=None, encoding=None,
128 verbose=0, version=None):
133 self.__version = version
134 schema, uri = urllib.splittype(uri)
135 if schema not in ('http', 'https'):
136 raise IOError('Unsupported JSON-RPC protocol.')
137 self.__host, self.__handler = urllib.splithost(uri)
138 if not self.__handler:
139 # Not sure if this is in the JSON spec?
140 self.__handler = '/RPC2'
141 if transport is None:
142 if schema == 'https':
143 transport = SafeTransport()
145 transport = Transport()
146 self.__transport = transport
147 self.__encoding = encoding
148 self.__verbose = verbose
150 def __request(self, methodname, params, rpcid=None):
151 request = dumps(params, methodname, encoding=self.__encoding,
152 rpcid=rpcid, version=self.__version)
153 response = self.__run_request(request)
154 return response['result']
156 def __notify(self, methodname, params, rpcid=None):
157 request = dumps(params, methodname, encoding=self.__encoding,
158 rpcid=rpcid, version=self.__version, notify=True)
160 response = self.__run_request(request, notify=True)
163 def __run_request(self, request, notify=None):
165 global _last_response
166 _last_request = request
168 response = self.__transport.request(
172 verbose=self.__verbose
175 # Here, the XMLRPC library translates a single list
176 # response to the single value -- should we do the
177 # same, and require a tuple / list to be passed to
178 # the response object, or expect the Server to be
179 # outputting the response appropriately?
181 _last_response = response
183 # notification, no result
185 return check_for_errors(response)
187 def __getattr__(self, name):
188 # Same as original, just with new _Method and wrapper
190 if name in ('__notify', '__run_request'):
191 wrapped_name = '_%s%s' % (self.__class__.__name__, name)
192 return getattr(self, wrapped_name)
193 return _Method(self.__request, name)
195 class _Method(XML_Method):
196 def __call__(self, *args, **kwargs):
197 if len(args) > 0 and len(kwargs) > 0:
198 raise ProtocolError('Cannot use both positional ' +
199 'and keyword arguments (according to JSON-RPC spec.)')
201 return self.__send(self.__name, args)
203 return self.__send(self.__name, kwargs)
205 # Batch implementation
209 def __init__(self, method, notify=False):
214 def __call__(self, *args, **kwargs):
215 if len(kwargs) > 0 and len(args) > 0:
216 raise ProtocolError('A Job cannot have both positional ' +
217 'and keyword arguments.')
223 def request(self, encoding=None, rpcid=None):
224 return dumps(self.params, self.method, version=2.0,
225 encoding=encoding, rpcid=rpcid, notify=self.notify)
228 return '%s' % self.request()
230 class MultiCall(ServerProxy):
232 def __init__(self, uri, *args, **kwargs):
234 ServerProxy.__init__(self, uri, *args, **kwargs)
236 def __run_request(self, request_body):
237 run_request = getattr(ServerProxy, '_ServerProxy__run_request')
238 return run_request(self, request_body)
241 if len(self.__job_list) < 1:
242 # Should we alert? This /is/ pretty obvious.
244 request_body = '[ %s ]' % ','.join([job.request() for
245 job in self.__job_list])
246 responses = self.__run_request(request_body)
247 del self.__job_list[:]
248 return [ response['result'] for response in responses ]
250 def __notify(self, method, params=[]):
251 new_job = Job(method, notify=True)
252 new_job.params = params
253 self.__job_list.append(new_job)
255 def __getattr__(self, name):
256 if name in ('__run', '__notify'):
257 wrapped_name = '_%s%s' % (self.__class__.__name__, name)
258 return getattr(self, wrapped_name)
260 self.__job_list.append(new_job)
265 # These lines conform to xmlrpclib's "compatibility" line.
266 # Not really sure if we should include these, but oh well.
270 # JSON-RPC error class
271 def __init__(self, code=-32000, message='Server error'):
272 self.faultCode = code
273 self.faultString = message
276 return {'code':self.faultCode, 'message':self.faultString}
278 def response(self, rpcid=None, version=None):
282 return dumps(self, rpcid=None, methodresponse=True,
285 def random_id(length=8):
289 choices = string.lowercase+string.digits
291 for i in range(length):
292 return_id += random.choice(choices)
296 def __init__(self, rpcid=None, version=None):
301 self.version = float(version)
303 def request(self, method, params=[]):
304 if type(method) not in types.StringTypes:
305 raise ValueError('Method name must be a string.')
307 self.id = random_id()
308 request = {'id':self.id, 'method':method, 'params':params}
309 if self.version >= 2:
310 request['jsonrpc'] = str(self.version)
313 def notify(self, method, params=[]):
314 request = self.request(method, params)
315 if self.version >= 2:
321 def response(self, result=None):
322 response = {'result':result, 'id':self.id}
323 if self.version >= 2:
324 response['jsonrpc'] = str(self.version)
326 response['error'] = None
329 def error(self, code=-32000, message='Server error.'):
330 error = self.response()
331 if self.version >= 2:
334 error['result'] = None
335 error['error'] = {'code':code, 'message':message}
338 def dumps(params=[], methodname=None, methodresponse=None,
339 encoding=None, rpcid=None, version=None, notify=None):
341 This differs from the Python implementation in that it implements
342 the rpcid argument since the 2.0 spec requires it for responses.
347 valid_params = (types.TupleType, types.ListType, types.DictType)
348 if methodname in types.StringTypes and \
349 type(params) not in valid_params and \
350 not isinstance(params, Fault):
352 If a method, and params are not in a listish or a Fault,
355 raise TypeError('Params must be a dict, list, tuple or Fault ' +
357 if type(methodname) not in types.StringTypes and methodresponse != True:
358 raise ValueError('Method name must be a string, or methodresponse '+
359 'must be set to True.')
360 if isinstance(params, Fault) and not methodresponse:
361 raise TypeError('You can only use a Fault for responses.')
362 # Begin parsing object
363 payload = Payload(rpcid=rpcid, version=version)
366 if type(params) is Fault:
367 response = payload.error(params.faultCode, params.faultString)
368 return jdumps(response, encoding=encoding)
369 if methodresponse is True:
371 raise ValueError('A method response must have an rpcid.')
372 response = payload.response(params)
373 return jdumps(response, encoding=encoding)
376 request = payload.notify(methodname, params)
378 request = payload.request(methodname, params)
379 return jdumps(request, encoding=encoding)
383 This differs from the Python implementation, in that it returns
384 the request structure in Dict format instead of the method, params.
385 It will return a list in the case of a batch request / response.
390 result = jloads(data)
391 # if the above raises an error, the implementing server code
392 # should return something like the following:
393 # { 'jsonrpc':'2.0', 'error': fault.error(), id: None }
396 def check_for_errors(result):
398 if not isbatch(result):
399 result_list.append(result)
402 for entry in result_list:
403 if 'jsonrpc' in entry.keys() and float(entry['jsonrpc']) > 2.0:
404 raise NotImplementedError('JSON-RPC version not yet supported.')
405 if 'error' in entry.keys() and entry['error'] != None:
406 code = entry['error']['code']
407 message = entry['error']['message']
408 raise ProtocolError('ERROR %s: %s' % (code, message))
413 if type(result) not in (types.ListType, types.TupleType):
417 if type(result[0]) is not types.DictType:
419 if 'jsonrpc' not in result[0].keys():
422 version = float(result[0]['jsonrpc'])
424 raise ProtocolError('"jsonrpc" key must be a float(able) value.')