test: use json-rpc 2.0 in all functional tests by default

test/functional/test_framework/authproxy.py

@@ -26,7 +26,7 @@ ServiceProxy class:
 
 - HTTP connections persist for the life of the AuthServiceProxy object
   (if server supports HTTP/1.1)
-- sends protocol 'version', per JSON-RPC 1.1
+- sends "jsonrpc":"2.0", per JSON-RPC 2.0
 - sends proper, incrementing 'id'
 - sends Basic HTTP authentication headers
 - parses all JSON numbers that look like floats as Decimal
@@ -117,7 +117,7 @@ class AuthServiceProxy():
             params = dict(args=args, **argsn)
         else:
             params = args or argsn
-        return {'version': '1.1',
+        return {'jsonrpc': '2.0',
                 'method': self._service_name,
                 'params': params,
                 'id': AuthServiceProxy.__id_count}
@@ -125,15 +125,28 @@ class AuthServiceProxy():
     def __call__(self, *args, **argsn):
         postdata = json.dumps(self.get_request(*args, **argsn), default=serialization_fallback, ensure_ascii=self.ensure_ascii)
         response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
-        if response['error'] is not None:
-            raise JSONRPCException(response['error'], status)
-        elif 'result' not in response:
-            raise JSONRPCException({
-                'code': -343, 'message': 'missing JSON-RPC result'}, status)
-        elif status != HTTPStatus.OK:
-            raise JSONRPCException({
-                'code': -342, 'message': 'non-200 HTTP status code but no JSON-RPC error'}, status)
+        # For backwards compatibility tests, accept JSON RPC 1.1 responses
+        if 'jsonrpc' not in response:
+            if response['error'] is not None:
+                raise JSONRPCException(response['error'], status)
+            elif 'result' not in response:
+                raise JSONRPCException({
+                    'code': -343, 'message': 'missing JSON-RPC result'}, status)
+            elif status != HTTPStatus.OK:
+                raise JSONRPCException({
+                    'code': -342, 'message': 'non-200 HTTP status code but no JSON-RPC error'}, status)
+            else:
+                return response['result']
         else:
+            assert response['jsonrpc'] == '2.0'
+            if status != HTTPStatus.OK:
+                raise JSONRPCException({
+                    'code': -342, 'message': 'non-200 HTTP status code'}, status)
+            if 'error' in response:
+                raise JSONRPCException(response['error'], status)
+            elif 'result' not in response:
+                raise JSONRPCException({
+                    'code': -343, 'message': 'missing JSON-RPC 2.0 result and error'}, status)
             return response['result']
 
     def batch(self, rpc_call_list):
@@ -142,7 +155,7 @@ class AuthServiceProxy():
         response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
         if status != HTTPStatus.OK:
             raise JSONRPCException({
-                'code': -342, 'message': 'non-200 HTTP status code but no JSON-RPC error'}, status)
+                'code': -342, 'message': 'non-200 HTTP status code'}, status)
         return response
 
     def _get_response(self):