async_file_upload.proto

syntax = "proto3";

// connection sanity check
message PingRequest {
    string client_id = 1;
}

message PingResponse {
    string client_id = 1;
    string session_id = 2;
}

// file metadata
message MetaData {
    string file_name = 1;
    string file_type = 2;
}

// file data
message File {
    bytes file_data_bytes = 1;
}

// file upload request
message FileUploadRequest {
    string client_id = 1;
    string session_id = 2;
    oneof request {
        MetaData meta_data = 3;
        File file_data = 4;
    }
}

// file upload response 
message FileUploadResponse {
    string file_name = 1;
    string upload_status = 2;
}

// file transfer to server service
service FileTransforToServer {
    rpc Handshake(PingRequest) returns (PingResponse);
    rpc UploadToServer(FileUploadRequest) returns (stream FileUploadResponse);
}