syntax = "proto3";

import "types/types.proto";

package txpool;

option go_package = "./txpool;txpool";

message TxHashes { repeated types.H256 hashes = 1; }

message ImportRequest { repeated bytes txs = 1; }

enum ImportResult {
  SUCCESS = 0;
  ALREADY_EXISTS = 1;
  FEE_TOO_LOW = 2;
  STALE = 3;
  INVALID = 4;
  INTERNAL_ERROR = 5;
}

message ImportReply { repeated ImportResult imported = 1; }

message GetTransactionsRequest { repeated types.H256 hashes = 1; }
message GetTransactionsReply { repeated bytes txs = 1; }

service Txpool {
  // preserves incoming order, changes amount, unknown hashes will be omitted
  rpc FindUnknownTransactions(TxHashes) returns (TxHashes);
  // preserves incoming order and amount
  rpc ImportTransactions(ImportRequest) returns (ImportReply);
  // preserves incoming order and amount, if some transaction doesn't exists in pool - returns nil in this slot
  rpc GetTransactions(GetTransactionsRequest) returns (GetTransactionsReply);
}