transmission/libtransmission/torrents.cc

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// This file Copyright © 2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <set>
#include <string_view>
#include <vector>
#include "transmission.h"
#include "magnet-metainfo.h"
#include "torrent.h"
#include "torrents.h"
#include "tr-assert.h"
namespace
{
struct CompareTorrentByHash
{
bool operator()(tr_sha1_digest_t const& a, tr_sha1_digest_t const& b) const
{
return a < b;
}
bool operator()(tr_torrent const* a, tr_torrent const* b) const
{
return (*this)(a->infoHash(), b->infoHash());
}
bool operator()(tr_torrent const* a, tr_sha1_digest_t const& b) const
{
return (*this)(a->infoHash(), b);
}
bool operator()(tr_sha1_digest_t const& a, tr_torrent const* b) const
{
return (*this)(a, b->infoHash());
}
};
} // namespace
tr_torrent* tr_torrents::get(tr_torrent_id_t id)
{
TR_ASSERT(0 < id);
TR_ASSERT(static_cast<size_t>(id) < std::size(by_id_));
if (static_cast<size_t>(id) >= std::size(by_id_))
{
return nullptr;
}
auto* const tor = by_id_.at(id);
TR_ASSERT(tor == nullptr || tor->id() == id);
TR_ASSERT(
std::count_if(std::begin(removed_), std::end(removed_), [&id](auto const& removed) { return id == removed.first; }) ==
(tor == nullptr ? 1 : 0));
return tor;
}
tr_torrent* tr_torrents::get(std::string_view magnet_link)
{
auto magnet = tr_magnet_metainfo{};
return magnet.parseMagnet(magnet_link) ? get(magnet.infoHash()) : nullptr;
}
tr_torrent* tr_torrents::get(tr_sha1_digest_t const& hash)
{
auto [begin, end] = std::equal_range(std::begin(by_hash_), std::end(by_hash_), hash, CompareTorrentByHash{});
return begin == end ? nullptr : *begin;
}
tr_torrent const* tr_torrents::get(tr_sha1_digest_t const& hash) const
{
auto [begin, end] = std::equal_range(std::cbegin(by_hash_), std::cend(by_hash_), hash, CompareTorrentByHash{});
return begin == end ? nullptr : *begin;
}
tr_torrent_id_t tr_torrents::add(tr_torrent* tor)
{
auto const id = static_cast<tr_torrent_id_t>(std::size(by_id_));
by_id_.push_back(tor);
by_hash_.insert(std::lower_bound(std::begin(by_hash_), std::end(by_hash_), tor, CompareTorrentByHash{}), tor);
return id;
}
void tr_torrents::remove(tr_torrent const* tor, time_t timestamp)
{
TR_ASSERT(tor != nullptr);
TR_ASSERT(get(tor->id()) == tor);
by_id_[tor->id()] = nullptr;
auto const [begin, end] = std::equal_range(std::begin(by_hash_), std::end(by_hash_), tor, CompareTorrentByHash{});
by_hash_.erase(begin, end);
removed_.emplace_back(tor->id(), timestamp);
}
std::vector<tr_torrent_id_t> tr_torrents::removedSince(time_t timestamp) const
{
auto ids = std::set<tr_torrent_id_t>{};
for (auto const& [id, removed_at] : removed_)
{
if (removed_at >= timestamp)
{
ids.insert(id);
}
}
return { std::begin(ids), std::end(ids) };
}