syntax = "proto3";

package downloader;

// Downloader is the service used for downloading/sycning blocks.
service Downloader {
  rpc Query(DownloaderRequest) returns (DownloaderResponse) {}
}

// DownloaderRequest is the generic download request.
message DownloaderRequest {
  enum RequestType {
    HEADER = 0;
    BLOCK = 1;
    UNKOWN = 2;
  }
 
  // Request type.
  RequestType type = 1;

  // The hashes of the blocks we want to download.
  repeated bytes hashes = 2;
}

// DownloaderResponse is the generic response of DownloaderRequest.
message DownloaderResponse {
  // payload of Block.
  repeated bytes payload = 1;
}