libtorrent
Description: A feature complete BitTorrent protocol implementation as a C++ library

Version: | 2.0.10

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Table of contents

- announce_infohash
- announce_endpoint
- announce_entry
  - operator=() ~announce_entry() announce_entry()
  - enum tracker_source

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# announce_infohash

Declared in "libtorrent/announce_entry.hpp"

    struct announce_infohash
    {
       std::string message;
       error_code last_error;
       int scrape_incomplete  = -1;
       int scrape_complete  = -1;
       int scrape_downloaded  = -1;
       std::uint8_t fails : 7;
       bool updating : 1;
       bool start_sent : 1;
       bool complete_sent : 1;
    };

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message
  if this tracker has returned an error or warning message that message is stored here

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last_error
  if this tracker failed the last time it was contacted this error code specifies what error occurred

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scrape_incomplete scrape_complete scrape_downloaded
  if this tracker has returned scrape data, these fields are filled in with valid numbers. Otherwise they are set to -1. `incomplete` counts the number of current downloaders. `complete` counts the number of current peers completed the download, or "seeds". `downloaded` is the cumulative number of completed downloads.

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fails
  the number of times in a row we have failed to announce to this tracker.

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updating
  true while we're waiting for a response from the tracker.

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start_sent
  set to true when we get a valid response from an announce with event=started. If it is set, we won't send start in the subsequent announces.

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complete_sent
  set to true when we send a event=completed.

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# announce_endpoint

Declared in "libtorrent/announce_entry.hpp"

announces are sent to each tracker using every listen socket this class holds information about one listen socket for one tracker

    struct announce_endpoint
    {
       announce_endpoint ();

       tcp::endpoint local_endpoint;
       aux::array<announce_infohash, num_protocols, protocol_version> info_hashes;
       bool enabled  = true;
    };

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local_endpoint
  the local endpoint of the listen interface associated with this endpoint

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info_hashes
  info_hashes[0] is the v1 info hash (SHA1) info_hashes[1] is the v2 info hash (truncated SHA-256)

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enabled
  set to false to not announce from this endpoint

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# announce_entry

Declared in "libtorrent/announce_entry.hpp"

this class holds information about one bittorrent tracker, as it relates to a specific torrent.

    struct announce_entry
    {
       announce_entry (announce_entry const&);
       announce_entry& operator= (announce_entry const&) &;
       explicit announce_entry (string_view u);
       announce_entry ();
       ~announce_entry ();

       enum tracker_source
       {
          source_torrent,
          source_client,
          source_magnet_link,
          source_tex,
       };

       std::string url;
       std::string trackerid;
       std::vector<announce_endpoint> endpoints;
       std::uint8_t tier  = 0;
       std::uint8_t fail_limit  = 0;
       std::uint8_t source:4;
       bool verified:1;
    };

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## operator=() ~announce_entry() announce_entry()

    announce_entry (announce_entry const&);
    announce_entry& operator= (announce_entry const&) &;
    explicit announce_entry (string_view u);
    announce_entry ();
    ~announce_entry ();

constructs a tracker announce entry with `u` as the URL.

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## enum tracker_source

Declared in "libtorrent/announce_entry.hpp"

name | value | description
--- | --- | ---
source_torrent | 1 | the tracker was part of the .torrent file
source_client | 2 | the tracker was added programmatically via the add_tracker() function
source_magnet_link | 4 | the tracker was part of a magnet link
source_tex | 8 | the tracker was received from the swarm via tracker exchange

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url
  tracker URL as it appeared in the torrent file

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trackerid
  the current `&trackerid=` argument passed to the tracker. this is optional and is normally empty (in which case no trackerid is sent).

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endpoints
  each local listen socket (endpoint) will announce to the tracker. This list contains state per endpoint.

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tier
  the tier this tracker belongs to

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fail_limit
  the max number of failures to announce to this tracker in a row, before this tracker is not used anymore. 0 means unlimited

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source
  a bitmask specifying which sources we got this tracker from.

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verified
  set to true the first time we receive a valid response from this tracker.