lokinet/llarp/service/intro.hpp

#pragma once

#include <llarp/crypto/types.hpp>
#include <llarp/path/path_types.hpp>
#include <llarp/util/bencode.hpp>
#include <llarp/util/status.hpp>

#include <oxenc/bt.h>

#include <iostream>

namespace
{
  static auto intro_cat = llarp::log::Cat("lokinet.intro");
}  // namespace

namespace llarp::service
{
  struct Introduction
  {
    RouterID router;
    PathID_t path_id;
    llarp_time_t latency = 0s;
    llarp_time_t expiry = 0s;
    uint64_t version = llarp::constants::proto_version;

    Introduction() = default;
    Introduction(std::string buf);

    util::StatusObject
    ExtractStatus() const;

    bool
    IsExpired(llarp_time_t now) const
    {
      return now >= expiry;
    }

    bool
    ExpiresSoon(llarp_time_t now, llarp_time_t dlt = 30s) const
    {
      return IsExpired(now + dlt);
    }

    std::string
    ToString() const;

    void
    bt_encode(oxenc::bt_list_producer& btlp) const;
    void
    bt_encode(oxenc::bt_dict_producer& subdict) const;

    bool
    BDecode(llarp_buffer_t* buf)
    {
      return bencode_decode_dict(*this, buf);
    }

    bool
    decode_key(const llarp_buffer_t& key, llarp_buffer_t* buf);

    void
    Clear();

    bool
    operator<(const Introduction& other) const
    {
      return std::tie(expiry, path_id, router, version, latency)
          < std::tie(other.expiry, other.path_id, other.router, other.version, other.latency);
    }

    bool
    operator==(const Introduction& other) const
    {
      return path_id == other.path_id && router == other.router;
    }

    bool
    operator!=(const Introduction& other) const
    {
      return path_id != other.path_id || router != other.router;
    }
  };

  /// comparator for introset timestamp
  struct CompareIntroTimestamp
  {
    bool
    operator()(const Introduction& left, const Introduction& right) const
    {
      return left.expiry > right.expiry;
    }
  };
}  // namespace llarp::service

template <>
constexpr inline bool llarp::IsToStringFormattable<llarp::service::Introduction> = true;

namespace std
{
  template <>
  struct hash<llarp::service::Introduction>
  {
    size_t
    operator()(const llarp::service::Introduction& i) const
    {
      return std::hash<llarp::PubKey>{}(i.router) ^ std::hash<llarp::PathID_t>{}(i.path_id);
    }
  };
}  // namespace std