grpc-server-downloadfile.py

class Greeter(hello_pb2_grpc.GreeterServicer):
    def DownloadFile(self, request, context):
        chunk_size = 1024

        filepath = f'{request.filename}{request.extension}'
        if os.path.exists(filepath):
            with open(filepath, mode="rb") as f:
                while True:
                    chunk = f.read(chunk_size)
                    if chunk:
                        entry_response = hello_pb2.FileResponse(chunk_data=chunk)
                        yield entry_response
                    else:  # The chunk was empty, which means we're at the end of the file
                        return