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;
    NEWBLOCK = 2;
    REGISTER = 3;
    REGISTERTIMEOUT = 4;
    UNKNOWN = 5;
  }
 
  // Request type.
  RequestType type = 1;

  // The hashes of the blocks we want to download.
  repeated bytes hashes = 2;
  bytes peerHash = 3;
  bytes blockHash = 4;
}

// DownloaderResponse is the generic response of DownloaderRequest.
message DownloaderResponse {
    enum RegisterResponseType {
        SUCCESS = 0;
        FAIL = 1;
        INSYNC = 2;   // node is now in sync, remove it from the broadcast list
    }
  // payload of Block.
  repeated bytes payload = 1;
  // response of registration request
  RegisterResponseType type = 2;
}