grpc-server-uploadfile.py

def get_filepath(filename, extension):
    return f'{filename}{extension}'


class Greeter(hello_pb2_grpc.GreeterServicer):
    ....

    def UploadFile(self, request_iterator, context):
        data = bytearray()
        filepath = 'dummy'

        for request in request_iterator:
            if request.metadata.filename and request.metadata.extension:
                filepath = get_filepath(request.metadata.filename, request.metadata.extension)
                continue
            data.extend(request.chunk_data)
        with open(filepath, 'wb') as f:
            f.write(data)
        return hello_pb2.StringResponse(message='Success!')