Release 1ef858a12d - Channel name added

__init__.py

 """The Tested Interpreter-Versions"""
 
 
-class RegistrationError(BaseException):
-    pass
-
-
 class callback_storage(dict):
     def __init__(self):
         dict.__init__(self)
         return (None, None, None)
 
     def add(self, service_id, data_id, callback, *args, **kwargs):
-        if self.get(service_id, data_id) != (None, None, None):
-            raise RegistrationError("Callback for service_id (%s) and data_id (%s) already exists" % (repr(service_id), repr(data_id)))
+        cb_data = self.get(service_id, data_id)
+        if cb_data != (None, None, None):
+            logger.warning("Overwriting existing callback %s for service_id (%s) and data_id (%s) to %s!" , repr(cb_data[0].__name__), repr(service_id), repr(data_id), repr(callback.__name__))
         if service_id not in self:
             self[service_id] = {}
         self[service_id][data_id] = (callback, args, kwargs)
 
     .. literalinclude:: ../../socket_protocol/_examples_/socket_protocol__struct_json_protocol_client.log
     """
-    LOG_PREFIX = 'SJP:'
-
     SID_AUTH_SEED_REQUEST = 1
     SID_AUTH_KEY_REQUEST = 2
     SID_AUTH_KEY_CHECK_REQUEST = 3
     SID_AUTH_KEY_CHECK_RESPONSE = 4
+    SID_CHANNEL_NAME_REQUEST = 5
+    SID_CHANNEL_NAME_RESPONSE = 6
     SID_READ_REQUEST = 10
     SID_READ_RESPONSE = 11
     SID_WRITE_REQUEST = 20
     SID_RESPONSE_DICT = {SID_AUTH_SEED_REQUEST: SID_AUTH_KEY_REQUEST,
                          SID_AUTH_KEY_REQUEST: SID_AUTH_KEY_CHECK_REQUEST,
                          SID_AUTH_KEY_CHECK_REQUEST: SID_AUTH_KEY_CHECK_RESPONSE,
+                         SID_CHANNEL_NAME_REQUEST: SID_CHANNEL_NAME_RESPONSE,
                          SID_READ_REQUEST: SID_READ_RESPONSE,
                          SID_WRITE_REQUEST: SID_WRITE_RESPONSE,
                          SID_EXECUTE_REQUEST: SID_EXECUTE_RESPONSE}
                          AUTH_STATE_KEY_TRANSFERRED: 'Key has been sent',
                          AUTH_STATE_TRUSTED_CLIENT: 'Trusted Client'}
 
-    def __init__(self, comm_instance, secret=None, auto_auth=False):
+    def __init__(self, comm_instance, secret=None, auto_auth=False, channel_name=None):
+        self.__comm_inst__ = comm_instance
         self.__secret__ = secret
         self.__auto_auth__ = auto_auth
+        self.__channel_name__ = channel_name
+        #
         self.__clean_receive_buffer__()
         self.__callbacks__ = callback_storage()
         self.__callbacks__.add(self.SID_AUTH_SEED_REQUEST, 0, self.__authentificate_create_seed__)
         self.__callbacks__.add(self.SID_AUTH_KEY_REQUEST, 0, self.__authentificate_create_key__)
         self.__callbacks__.add(self.SID_AUTH_KEY_CHECK_REQUEST, 0, self.__authentificate_check_key__)
         self.__callbacks__.add(self.SID_AUTH_KEY_CHECK_RESPONSE, 0, self.__authentificate_process_feedback__)
+        self.__callbacks__.add(self.SID_CHANNEL_NAME_REQUEST, 0, self.__channel_name_request__)
+        self.__callbacks__.add(self.SID_CHANNEL_NAME_RESPONSE, 0, self.__channel_name_response__)
         self.__authentification_state_reset__()
         self.__seed__ = None
-        self.__comm_inst__ = comm_instance
         self.__comm_inst__.register_callback(self.__data_available_callback__)
         self.__comm_inst__.register_connect_callback(self.__connection_established__)
         self.__comm_inst__.register_disconnect_callback(self.__authentification_state_reset__)
 
+    def __log_prefix__(self):
+        postfix = ' (client)' if self.__comm_inst__.IS_CLIENT else ' (server)'
+        if self.__channel_name__ is None:
+            return __name__ + postfix + ':'
+        else:
+            return self.__channel_name__ + postfix + ':'
+
     def connected(self):
         return self.__comm_inst__.is_connected()
 
 
     def __connection_established__(self):
         self.__clean_receive_buffer__()
+        if not self.__comm_inst__.IS_CLIENT:
+            self.send(self.SID_CHANNEL_NAME_REQUEST, 0, self.__channel_name__)
         if self.__auto_auth__ and self.__comm_inst__.IS_CLIENT and self.__secret__ is not None:
             self.authentificate()
 
+    def __channel_name_request__(self, msg):
+        data = msg.get_data()
+        if data is None:
+            return self.STATUS_OKAY, self.__channel_name__
+        else:
+            prev_channel_name = self.__channel_name__
+            self.__channel_name__ = data
+            if prev_channel_name is not None and prev_channel_name != data:
+                logger.warning('%s overwriting user defined channel name from %s to %s', self.__log_prefix__(), repr(prev_channel_name), repr(data))
+            elif prev_channel_name is None:
+                logger.info('%s channel name is now %s', self.__log_prefix__(), repr(self.__channel_name__))
+            return self.STATUS_OKAY, None
+
+    def __channel_name_response__(self, msg):
+        data = msg.get_data()
+        if self.__channel_name__ is None and data is not None:
+            self.__channel_name__ = data
+            logger.info('%s channel name is now %s', self.__log_prefix__(), repr(self.__channel_name__))
+        return self.STATUS_OKAY, None
+
     def __authentification_state_reset__(self):
-        logger.info("%s Resetting authentification state to AUTH_STATE_UNKNOWN_CLIENT", self.LOG_PREFIX)
+        logger.info("%s Resetting authentification state to AUTH_STATE_UNKNOWN_CLIENT", self.__log_prefix__())
         self.__authentification_state__ = self.AUTH_STATE_UNKNOWN_CLIENT
 
     def __analyse_frame__(self, frame):
     def __data_available_callback__(self, comm_inst):
         frame = comm_inst.receive()
         if not self.__check_frame_checksum__(frame):
-            logger.warning("%s Received message has a wrong checksum and will be ignored: %s.", self.LOG_PREFIX, stringtools.hexlify(frame))
+            logger.warning("%s Received message has a wrong checksum and will be ignored: %s.", self.__log_prefix__(), stringtools.hexlify(frame))
         else:
             msg = self.__analyse_frame__(frame)
             logger.info(
                 '%s RX <- status: %s, service_id: %s, data_id: %s, data: "%s"',
-                self.LOG_PREFIX,
+                self.__log_prefix__(),
                 repr(msg.get_status()),
                 repr(msg.get_service_id()),
                 repr(msg.get_data_id()),
                 if self.__secret__ is not None and not self.check_authentification_state() and msg.get_service_id() not in self.SID_AUTH_LIST:
                     status = self.STATUS_AUTH_REQUIRED
                     data = None
-                    logger.warning("%s Received message needs authentification: %s. Sending negative response.", self.LOG_PREFIX, self.AUTH_STATUS_NAMES.get(self.__authentification_state__, 'Unknown authentification status!'))
+                    logger.warning("%s Received message needs authentification: %s. Sending negative response.", self.__log_prefix__(), self.AUTH_STATUS_NAMES.get(self.__authentification_state__, 'Unknown authentification status!'))
                 elif callback is None:
-                    logger.warning("%s Received message with no registered callback. Sending negative response.", self.LOG_PREFIX)
+                    logger.warning("%s Received message with no registered callback. Sending negative response.", self.__log_prefix__())
                     status = self.STATUS_BUFFERING_UNHANDLED_REQUEST
                     data = None
                 else:
                     try:
-                        logger.debug("%s Executing callback %s to process received data", self.LOG_PREFIX, callback.__name__)
+                        logger.debug("%s Executing callback %s to process received data", self.__log_prefix__(), callback.__name__)
                         status, data = callback(msg, *args, **kwargs)
                     except TypeError:
                         raise TypeError('Check return value of callback function {callback_name} for service_id  {service_id} and data_id {data_id}'.format(callback_name=callback.__name__, service_id=repr(msg.get_service_id()), data_id=repr(msg.get_data_id())))
                 # RESPONSE RECEIVED
                 #
                 if msg.get_status() not in [self.STATUS_OKAY]:
-                    logger.warning("%s Received message has a peculiar status: %s", self.LOG_PREFIX, self.STATUS_NAMES.get(msg.get_status(), 'Unknown status response!'))
+                    logger.warning("%s Received message has a peculiar status: %s", self.__log_prefix__(), self.STATUS_NAMES.get(msg.get_status(), 'Unknown status response!'))
                 if callback is None:
                     status = self.STATUS_OKAY
                     data = None
                     self.__buffer_received_data__(msg)
                 else:
                     try:
-                        logger.debug("%s Executing callback %s to process received data", self.LOG_PREFIX, callback.__name__)
+                        logger.debug("%s Executing callback %s to process received data", self.__log_prefix__(), callback.__name__)
                         status, data = callback(msg, *args, **kwargs)
                     except TypeError:
                         raise TypeError('Check return value of callback function {callback_name} for service_id  {service_id} and data_id {data_id}'.format(callback_name=callback.__name__, service_id=repr(msg.get_service_id()), data_id=repr(msg.get_data_id())))
         if not msg.get_data_id() in self.__msg_buffer__[msg.get_service_id()]:
             self.__msg_buffer__[msg.get_service_id()][msg.get_data_id()] = []
         self.__msg_buffer__[msg.get_service_id()][msg.get_data_id()].append(msg)
-        logger.debug("%s Message data is stored in buffer and is now ready to be retrieved by receive method", self.LOG_PREFIX)
+        logger.debug("%s Message data is stored in buffer and is now ready to be retrieved by receive method", self.__log_prefix__())
 
     def __clean_receive_buffer__(self):
-        logger.debug("%s Cleaning up receive-buffer", self.LOG_PREFIX)
+        logger.debug("%s Cleaning up receive-buffer", self.__log_prefix__())
         self.__msg_buffer__ = {}
 
     def receive(self, service_id, data_id, timeout=1):
             cnt += 1
             time.sleep(0.1)
         if data is None and cnt >= timeout * 10:
-            logger.warning('%s TIMEOUT (%ss): Requested data (service_id: %s; data_id: %s) not in buffer.', self.LOG_PREFIX, repr(timeout), repr(service_id), repr(data_id))
+            logger.warning('%s TIMEOUT (%ss): Requested data (service_id: %s; data_id: %s) not in buffer.', self.__log_prefix__(), repr(timeout), repr(service_id), repr(data_id))
         return data
 
     def __mk_msg__(self, status, service_id, data_id, data):
 
         This methods sends out a message with the given content.
         """
-        logger.log(log_lvl, '%s TX -> status: %d, service_id: %d, data_id: %d, data: "%s"', self.LOG_PREFIX, status, service_id, data_id, repr(data))
+        logger.log(log_lvl, '%s TX -> status: %d, service_id: %d, data_id: %d, data: "%s"', self.__log_prefix__(), status, service_id, data_id, repr(data))
         return self.__comm_inst__.send(self.__build_frame__(service_id, data_id, data, status), timeout=timeout, log_lvl=logging.DEBUG)
 
     def register_callback(self, service_id, data_id, callback, *args, **kwargs):
         """
         if self.__secret__ is not None:
             self.__authentification_state__ = self.AUTH_STATE_SEED_REQUESTED
-            logger.info("%s Requesting seed for authentification", self.LOG_PREFIX)
+            logger.info("%s Requesting seed for authentification", self.__log_prefix__())
             self.send(self.SID_AUTH_SEED_REQUEST, 0, None)
             cnt = 0
             while cnt < timeout * 10:
             return hashlib.sha512(seed.encode('utf-8') + self.__secret__.encode('utf-8')).hexdigest()
 
     def __authentificate_create_seed__(self, msg):
-        logger.info("%s Got seed request, sending seed for authentification", self.LOG_PREFIX)
+        logger.info("%s Got seed request, sending seed for authentification", self.__log_prefix__())
         self.__authentification_state__ = self.AUTH_STATE_SEED_TRANSFERRED
         if sys.version_info >= (3, 0):
             self.__seed__ = binascii.hexlify(os.urandom(32)).decode('utf-8')
         return self.STATUS_OKAY, self.__seed__
 
     def __authentificate_create_key__(self, msg):
-        logger.info("%s Got seed, sending key for authentification", self.LOG_PREFIX)
+        logger.info("%s Got seed, sending key for authentification", self.__log_prefix__())
         self.__authentification_state__ = self.AUTH_STATE_KEY_TRANSFERRED
         seed = msg.get_data()
         key = self.__authentificate_salt_and_hash__(seed)
         key = msg.get_data()
         if key == self.__authentificate_salt_and_hash__(self.__seed__):
             self.__authentification_state__ = self.AUTH_STATE_TRUSTED_CLIENT
-            logger.info("%s Got correct key, sending positive authentification feedback", self.LOG_PREFIX)
+            logger.info("%s Got correct key, sending positive authentification feedback", self.__log_prefix__())
             return self.STATUS_OKAY, True
         else:
             self.__authentification_state__ = self.AUTH_STATE_UNKNOWN_CLIENT
-            logger.info("%s Got incorrect key, sending negative authentification feedback", self.LOG_PREFIX)
+            logger.info("%s Got incorrect key, sending negative authentification feedback", self.__log_prefix__())
             return self.STATUS_OKAY, False
 
     def __authentificate_process_feedback__(self, msg):
         feedback = msg.get_data()
         if feedback:
             self.__authentification_state__ = self.AUTH_STATE_TRUSTED_CLIENT
-            logger.info("%s Got positive authentification feedback", self.LOG_PREFIX)
+            logger.info("%s Got positive authentification feedback", self.__log_prefix__())
         else:
             self.__authentification_state__ = self.AUTH_STATE_UNKNOWN_CLIENT
-            logger.warning("%s Got negative authentification feedback", self.LOG_PREFIX)
+            logger.warning("%s Got negative authentification feedback", self.__log_prefix__())
         return self.STATUS_OKAY, None