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transmission/libtransmission/announcer-common.h
2023-07-08 10:24:03 -05:00

224 lines
6.4 KiB
C++

// This file Copyright © 2010-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#ifndef LIBTRANSMISSION_ANNOUNCER_MODULE
#error only the libtransmission announcer module should #include this header.
#endif
#include <array>
#include <chrono>
#include <cstdint> // uint64_t
#include <optional>
#include <string>
#include <string_view>
#include <vector>
#include "libtransmission/transmission.h"
#include "libtransmission/announcer.h"
#include "libtransmission/interned-string.h"
#include "libtransmission/net.h"
#include "libtransmission/peer-mgr.h" // tr_pex
struct tr_url_parsed_t;
void tr_tracker_http_scrape(tr_session const* session, tr_scrape_request const& req, tr_scrape_response_func on_response);
void tr_tracker_http_announce(tr_session const* session, tr_announce_request const& req, tr_announce_response_func on_response);
void tr_announcerParseHttpAnnounceResponse(tr_announce_response& response, std::string_view benc, std::string_view log_name);
void tr_announcerParseHttpScrapeResponse(tr_scrape_response& response, std::string_view benc, std::string_view log_name);
tr_interned_string tr_announcerGetKey(tr_url_parsed_t const& parsed);
[[nodiscard]] constexpr std::string_view tr_announce_event_get_string(tr_announce_event e)
{
switch (e)
{
case TR_ANNOUNCE_EVENT_COMPLETED:
return "completed";
case TR_ANNOUNCE_EVENT_STARTED:
return "started";
case TR_ANNOUNCE_EVENT_STOPPED:
return "stopped";
default:
return "";
}
}
struct tr_announce_request
{
tr_announce_event event = {};
bool partial_seed = false;
/* the port we listen for incoming peers on */
tr_port port;
// see discussion of tr_announce_key_t that type's declaration
tr_announce_key_t key;
/* the number of peers we'd like to get back in the response */
int numwant = 0;
/* the number of bytes we uploaded since the last 'started' event */
uint64_t up = 0;
/* the number of good bytes we downloaded since the last 'started' event */
uint64_t down = 0;
/* the number of bad bytes we downloaded since the last 'started' event */
uint64_t corrupt = 0;
/* the total size of the torrent minus the number of bytes completed */
uint64_t leftUntilComplete = 0;
/* the tracker's announce URL */
tr_interned_string announce_url;
/* key generated by and returned from an http tracker.
* see tr_announce_response.tracker_id_str */
std::string tracker_id;
/* the torrent's peer id.
* this changes when a torrent is stopped -> restarted. */
tr_peer_id_t peer_id;
/* the torrent's info_hash */
tr_sha1_digest_t info_hash;
/* the name to use when deep logging is enabled */
char log_name[128];
};
struct tr_announce_response
{
/* the torrent's info hash */
tr_sha1_digest_t info_hash = {};
/* whether or not we managed to connect to the tracker */
bool did_connect = false;
/* whether or not the scrape timed out */
bool did_timeout = false;
/* preferred interval between announces.
* transmission treats this as the interval for periodic announces */
int interval = 0;
/* minimum interval between announces. (optional)
* transmission treats this as the min interval for manual announces */
int min_interval = 0;
/* how many peers are seeding this torrent */
int seeders = -1;
/* how many peers are downloading this torrent */
int leechers = -1;
/* how many times this torrent has been downloaded */
int downloads = -1;
/* IPv4 peers that we acquired from the tracker */
std::vector<tr_pex> pex;
/* IPv6 peers that we acquired from the tracker */
std::vector<tr_pex> pex6;
/* human-readable error string on failure, or nullptr */
std::string errmsg;
/* human-readable warning string or nullptr */
std::string warning;
/* key generated by and returned from an http tracker.
* if this is provided, subsequent http announces must include this. */
std::string tracker_id;
/* tracker extension that returns the client's public IP address.
* https://www.bittorrent.org/beps/bep_0024.html */
std::optional<tr_address> external_ip;
};
// --- SCRAPE
/* pick a number small enough for common tracker software:
* - ocelot has no upper bound
* - opentracker has an upper bound of 64
* - udp protocol has an upper bound of 74
* - xbtt has no upper bound
*
* This is only an upper bound: if the tracker complains about
* length, announcer will incrementally lower the batch size.
*/
auto inline constexpr TR_MULTISCRAPE_MAX = 60;
auto inline constexpr TR_ANNOUNCE_TIMEOUT_SEC = std::chrono::seconds{ 45 };
auto inline constexpr TR_SCRAPE_TIMEOUT_SEC = std::chrono::seconds{ 30 };
struct tr_scrape_request
{
/* the scrape URL */
tr_interned_string scrape_url;
/* the name to use when deep logging is enabled */
char log_name[128];
/* info hashes of the torrents to scrape */
std::array<tr_sha1_digest_t, TR_MULTISCRAPE_MAX> info_hash;
/* how many hashes to use in the info_hash field */
int info_hash_count = 0;
};
struct tr_scrape_response_row
{
/* the torrent's info_hash */
tr_sha1_digest_t info_hash;
/* how many peers are seeding this torrent */
int seeders = 0;
/* how many peers are downloading this torrent */
int leechers = 0;
/* how many times this torrent has been downloaded */
int downloads = 0;
/* the number of active downloaders in the swarm.
* this is a BEP 21 extension that some trackers won't support.
* http://www.bittorrent.org/beps/bep_0021.html#tracker-scrapes */
int downloaders = 0;
};
struct tr_scrape_response
{
/* whether or not we managed to connect to the tracker */
bool did_connect = false;
/* whether or not the scrape timed out */
bool did_timeout = false;
/* how many info hashes are in the 'rows' field */
int row_count;
/* the individual torrents' scrape results */
std::array<tr_scrape_response_row, TR_MULTISCRAPE_MAX> rows;
/* the raw scrape url */
tr_interned_string scrape_url;
/* human-readable error string on failure, or nullptr */
std::string errmsg;
/* minimum interval (in seconds) allowed between scrapes.
* this is an unofficial extension that some trackers won't support. */
int min_request_interval;
};