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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def handle_stream(self, stream):
        '''
        Override this to handle the streams as they arrive

        :param IOStream stream: An IOStream for processing

        See https://tornado.readthedocs.io/en/latest/iostream.html#tornado.iostream.IOStream
        for additional details.
        '''
        @tornado.gen.coroutine
        def _null(msg):
            raise tornado.gen.Return(None)

        def write_callback(stream, header):
            if header.get('mid'):
                @tornado.gen.coroutine
                def return_message(msg):
                    pack = salt.transport.frame.frame_msg_ipc(
                        msg,
                        header={'mid': header['mid']},
                        raw_body=True,
                    )
                    yield stream.write(pack)
                return return_message
            else:
                return _null
        if six.PY2:
            encoding = None
        else:
            encoding = 'utf-8'
        unpacker = msgpack.Unpacker(encoding=encoding)
        while not stream.closed():
            try:
                wire_bytes = yield stream.read_bytes(4096, partial=True)
                unpacker.feed(wire_bytes)
                for framed_msg in unpacker:
                    body = framed_msg['body']
                    self.io_loop.spawn_callback(self.payload_handler, body, write_callback(stream, framed_msg['head']))
            except tornado.iostream.StreamClosedError:
                log.trace('Client disconnected from IPC %s', self.socket_path)
                break
            except socket.error as exc:
                # On occasion an exception will occur with
                # an error code of 0, it's a spurious exception.
                if exc.errno == 0:
                    log.trace('Exception occured with error number 0, '
                              'spurious exception: %s', exc)
                else:
                    log.error('Exception occurred while '
                              'handling stream: %s', exc)
            except Exception as exc:
                log.error('Exception occurred while '
                          'handling stream: %s', exc)