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transmission/libtransmission/resume.cc

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// This file Copyright © 2008-2023 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.
#include <cstring>
#include <ctime>
#include <string_view>
#include <vector>
#include <fmt/core.h>
#include "libtransmission/transmission.h"
#include "libtransmission/error.h"
#include "libtransmission/file.h"
#include "libtransmission/log.h"
#include "libtransmission/magnet-metainfo.h"
#include "libtransmission/peer-mgr.h" /* pex */
#include "libtransmission/resume.h"
#include "libtransmission/session.h"
#include "libtransmission/torrent.h"
#include "libtransmission/tr-assert.h"
#include "libtransmission/utils.h"
#include "libtransmission/variant.h"
using namespace std::literals;
namespace tr_resume
{
namespace
{
constexpr int MaxRememberedPeers = 200;
// ---
void savePeers(tr_variant* dict, tr_torrent const* tor)
{
if (auto const pex = tr_peerMgrGetPeers(tor, TR_AF_INET, TR_PEERS_INTERESTING, MaxRememberedPeers); !std::empty(pex))
{
tr_variantDictAddRaw(dict, TR_KEY_peers2, std::data(pex), sizeof(tr_pex) * std::size(pex));
}
if (auto const pex = tr_peerMgrGetPeers(tor, TR_AF_INET6, TR_PEERS_INTERESTING, MaxRememberedPeers); !std::empty(pex))
{
tr_variantDictAddRaw(dict, TR_KEY_peers2_6, std::data(pex), sizeof(tr_pex) * std::size(pex));
}
}
size_t addPeers(tr_torrent* tor, uint8_t const* buf, size_t buflen)
{
size_t const n_in = buflen / sizeof(tr_pex);
size_t const n_pex = std::min(n_in, size_t{ MaxRememberedPeers });
auto pex = std::array<tr_pex, MaxRememberedPeers>{};
memcpy(std::data(pex), buf, sizeof(tr_pex) * n_pex);
return tr_peerMgrAddPex(tor, TR_PEER_FROM_RESUME, std::data(pex), n_pex);
}
auto loadPeers(tr_variant* dict, tr_torrent* tor)
{
auto ret = tr_resume::fields_t{};
uint8_t const* str = nullptr;
auto len = size_t{};
if (tr_variantDictFindRaw(dict, TR_KEY_peers2, &str, &len))
{
size_t const num_added = addPeers(tor, str, len);
tr_logAddTraceTor(tor, fmt::format("Loaded {} IPv4 peers from resume file", num_added));
ret = tr_resume::Peers;
}
if (tr_variantDictFindRaw(dict, TR_KEY_peers2_6, &str, &len))
{
size_t const num_added = addPeers(tor, str, len);
tr_logAddTraceTor(tor, fmt::format("Loaded {} IPv6 peers from resume file", num_added));
ret = tr_resume::Peers;
}
return ret;
}
// ---
void saveLabels(tr_variant* dict, tr_torrent const* tor)
{
auto const& labels = tor->labels;
tr_variant* list = tr_variantDictAddList(dict, TR_KEY_labels, std::size(labels));
for (auto const& label : labels)
{
tr_variantListAddQuark(list, label);
}
}
auto loadLabels(tr_variant* dict, tr_torrent* tor)
{
tr_variant* list = nullptr;
if (!tr_variantDictFindList(dict, TR_KEY_labels, &list))
{
return tr_resume::fields_t{};
}
auto const n = tr_variantListSize(list);
auto labels = std::vector<tr_quark>{};
labels.reserve(n);
for (size_t i = 0; i < n; ++i)
{
auto sv = std::string_view{};
if (tr_variantGetStrView(tr_variantListChild(list, i), &sv) && !std::empty(sv))
{
labels.emplace_back(tr_quark_new(sv));
}
}
tor->setLabels(labels);
return tr_resume::Labels;
}
// ---
void saveGroup(tr_variant* dict, tr_torrent const* tor)
{
tr_variantDictAddStrView(dict, TR_KEY_group, tor->bandwidth_group());
}
auto loadGroup(tr_variant* dict, tr_torrent* tor)
{
if (std::string_view group_name; tr_variantDictFindStrView(dict, TR_KEY_group, &group_name) && !std::empty(group_name))
{
tor->set_bandwidth_group(group_name);
return tr_resume::Group;
}
return tr_resume::fields_t{};
}
// ---
void saveDND(tr_variant* dict, tr_torrent const* tor)
{
auto const n = tor->file_count();
tr_variant* const list = tr_variantDictAddList(dict, TR_KEY_dnd, n);
for (tr_file_index_t i = 0; i < n; ++i)
{
tr_variantListAddBool(list, !tr_torrentFile(tor, i).wanted);
}
}
auto loadDND(tr_variant* dict, tr_torrent* tor)
{
auto ret = tr_resume::fields_t{};
tr_variant* list = nullptr;
if (auto const n = tor->file_count(); tr_variantDictFindList(dict, TR_KEY_dnd, &list) && tr_variantListSize(list) == n)
{
auto wanted = std::vector<tr_file_index_t>{};
auto unwanted = std::vector<tr_file_index_t>{};
wanted.reserve(n);
unwanted.reserve(n);
for (tr_file_index_t i = 0; i < n; ++i)
{
auto tmp = false;
if (tr_variantGetBool(tr_variantListChild(list, i), &tmp) && tmp)
{
unwanted.push_back(i);
}
else
{
wanted.push_back(i);
}
}
tor->init_files_wanted(std::data(unwanted), std::size(unwanted), false);
tor->init_files_wanted(std::data(wanted), std::size(wanted), true);
ret = tr_resume::Dnd;
}
else
{
tr_logAddDebugTor(
tor,
fmt::format(
"Couldn't load DND flags. DND list {} has {} children; torrent has {} files",
fmt::ptr(list),
tr_variantListSize(list),
n));
}
return ret;
}
// ---
void saveFilePriorities(tr_variant* dict, tr_torrent const* tor)
{
auto const n = tor->file_count();
tr_variant* const list = tr_variantDictAddList(dict, TR_KEY_priority, n);
for (tr_file_index_t i = 0; i < n; ++i)
{
tr_variantListAddInt(list, tr_torrentFile(tor, i).priority);
}
}
auto loadFilePriorities(tr_variant* dict, tr_torrent* tor)
{
auto ret = tr_resume::fields_t{};
auto const n = tor->file_count();
tr_variant* list = nullptr;
if (tr_variantDictFindList(dict, TR_KEY_priority, &list) && tr_variantListSize(list) == n)
{
for (tr_file_index_t i = 0; i < n; ++i)
{
auto priority = int64_t{};
if (tr_variantGetInt(tr_variantListChild(list, i), &priority))
{
tor->set_file_priority(i, tr_priority_t(priority));
}
}
ret = tr_resume::FilePriorities;
}
return ret;
}
// ---
void saveSingleSpeedLimit(tr_variant* d, tr_torrent const* tor, tr_direction dir)
{
tr_variantDictReserve(d, 3);
tr_variantDictAddInt(d, TR_KEY_speed_Bps, tor->speed_limit_bps(dir));
tr_variantDictAddBool(d, TR_KEY_use_global_speed_limit, tor->uses_session_limits());
tr_variantDictAddBool(d, TR_KEY_use_speed_limit, tor->uses_speed_limit(dir));
}
void saveSpeedLimits(tr_variant* dict, tr_torrent const* tor)
{
saveSingleSpeedLimit(tr_variantDictAddDict(dict, TR_KEY_speed_limit_down, 0), tor, TR_DOWN);
saveSingleSpeedLimit(tr_variantDictAddDict(dict, TR_KEY_speed_limit_up, 0), tor, TR_UP);
}
void saveRatioLimits(tr_variant* dict, tr_torrent const* tor)
{
tr_variant* d = tr_variantDictAddDict(dict, TR_KEY_ratio_limit, 2);
tr_variantDictAddReal(d, TR_KEY_ratio_limit, tor->seed_ratio());
tr_variantDictAddInt(d, TR_KEY_ratio_mode, tor->seed_ratio_mode());
}
void saveIdleLimits(tr_variant* dict, tr_torrent const* tor)
{
tr_variant* d = tr_variantDictAddDict(dict, TR_KEY_idle_limit, 2);
tr_variantDictAddInt(d, TR_KEY_idle_limit, tor->idle_limit_minutes());
tr_variantDictAddInt(d, TR_KEY_idle_mode, tor->idle_limit_mode());
}
void loadSingleSpeedLimit(tr_variant* d, tr_direction dir, tr_torrent* tor)
{
if (auto val = int64_t{}; tr_variantDictFindInt(d, TR_KEY_speed_Bps, &val))
{
tor->set_speed_limit_bps(dir, val);
}
else if (tr_variantDictFindInt(d, TR_KEY_speed, &val))
{
tor->set_speed_limit_bps(dir, val * 1024);
}
if (auto val = bool{}; tr_variantDictFindBool(d, TR_KEY_use_speed_limit, &val))
{
tor->use_speed_limit(dir, val);
}
if (auto val = bool{}; tr_variantDictFindBool(d, TR_KEY_use_global_speed_limit, &val))
{
tr_torrentUseSessionLimits(tor, val);
}
}
auto loadSpeedLimits(tr_variant* dict, tr_torrent* tor)
{
auto ret = tr_resume::fields_t{};
if (tr_variant* child = nullptr; tr_variantDictFindDict(dict, TR_KEY_speed_limit_up, &child))
{
loadSingleSpeedLimit(child, TR_UP, tor);
ret = tr_resume::Speedlimit;
}
if (tr_variant* child = nullptr; tr_variantDictFindDict(dict, TR_KEY_speed_limit_down, &child))
{
loadSingleSpeedLimit(child, TR_DOWN, tor);
ret = tr_resume::Speedlimit;
}
return ret;
}
auto loadRatioLimits(tr_variant* dict, tr_torrent* tor)
{
auto ret = tr_resume::fields_t{};
if (tr_variant* d = nullptr; tr_variantDictFindDict(dict, TR_KEY_ratio_limit, &d))
{
if (auto dratio = double{}; tr_variantDictFindReal(d, TR_KEY_ratio_limit, &dratio))
{
tor->set_seed_ratio(dratio);
}
if (auto i = int64_t{}; tr_variantDictFindInt(d, TR_KEY_ratio_mode, &i))
{
tor->set_seed_ratio_mode(static_cast<tr_ratiolimit>(i));
}
ret = tr_resume::Ratiolimit;
}
return ret;
}
auto loadIdleLimits(tr_variant* dict, tr_torrent* tor)
{
auto ret = tr_resume::fields_t{};
if (tr_variant* d = nullptr; tr_variantDictFindDict(dict, TR_KEY_idle_limit, &d))
{
if (auto imin = int64_t{}; tr_variantDictFindInt(d, TR_KEY_idle_limit, &imin))
{
tor->set_idle_limit_minutes(imin);
}
if (auto i = int64_t{}; tr_variantDictFindInt(d, TR_KEY_idle_mode, &i))
{
tor->set_idle_limit_mode(static_cast<tr_idlelimit>(i));
}
ret = tr_resume::Idlelimit;
}
return ret;
}
// ---
void saveName(tr_variant* dict, tr_torrent const* tor)
{
tr_variantDictAddStrView(dict, TR_KEY_name, tr_torrentName(tor));
}
auto loadName(tr_variant* dict, tr_torrent* tor)
{
auto ret = tr_resume::fields_t{};
auto name = std::string_view{};
if (!tr_variantDictFindStrView(dict, TR_KEY_name, &name))
{
return ret;
}
name = tr_strv_strip(name);
if (std::empty(name))
{
return ret;
}
tor->set_name(name);
ret |= tr_resume::Name;
return ret;
}
// ---
void saveFilenames(tr_variant* dict, tr_torrent const* tor)
{
auto const n = tor->file_count();
tr_variant* const list = tr_variantDictAddList(dict, TR_KEY_files, n);
for (tr_file_index_t i = 0; i < n; ++i)
{
tr_variantListAddStrView(list, tor->file_subpath(i));
}
}
auto loadFilenames(tr_variant* dict, tr_torrent* tor)
{
auto ret = tr_resume::fields_t{};
tr_variant* list = nullptr;
if (!tr_variantDictFindList(dict, TR_KEY_files, &list))
{
return ret;
}
auto const n_files = tor->file_count();
auto const n_list = tr_variantListSize(list);
for (tr_file_index_t i = 0; i < n_files && i < n_list; ++i)
{
auto sv = std::string_view{};
if (tr_variantGetStrView(tr_variantListChild(list, i), &sv) && !std::empty(sv))
{
tor->set_file_subpath(i, sv);
}
}
ret |= tr_resume::Filenames;
return ret;
}
// ---
void bitfieldToRaw(tr_bitfield const& b, tr_variant* benc)
{
if (b.has_none() || std::empty(b))
{
tr_variantInitStr(benc, "none"sv);
}
else if (b.has_all())
{
tr_variantInitStrView(benc, "all"sv);
}
else
{
auto const raw = b.raw();
tr_variantInitRaw(benc, raw.data(), std::size(raw));
}
}
void rawToBitfield(tr_bitfield& bitfield, uint8_t const* raw, size_t rawlen)
{
if (raw == nullptr || rawlen == 0 || (rawlen == 4 && memcmp(raw, "none", 4) == 0))
{
bitfield.set_has_none();
}
else if (rawlen == 3 && memcmp(raw, "all", 3) == 0)
{
bitfield.set_has_all();
}
else
{
bitfield.set_raw(raw, rawlen);
}
}
void saveProgress(tr_variant* dict, tr_torrent const* tor)
{
tr_variant* const prog = tr_variantDictAddDict(dict, TR_KEY_progress, 4);
// add the mtimes
auto const& mtimes = tor->file_mtimes_;
auto const n = std::size(mtimes);
tr_variant* const l = tr_variantDictAddList(prog, TR_KEY_mtimes, n);
for (auto const& mtime : mtimes)
{
tr_variantListAddInt(l, mtime);
}
// add the 'checked pieces' bitfield
bitfieldToRaw(tor->checked_pieces_, tr_variantDictAdd(prog, TR_KEY_pieces));
/* add the progress */
if (tor->completeness == TR_SEED)
{
tr_variantDictAddStrView(prog, TR_KEY_have, "all"sv);
}
/* add the blocks bitfield */
bitfieldToRaw(tor->blocks(), tr_variantDictAdd(prog, TR_KEY_blocks));
}
/*
* Transmission has iterated through a few strategies here, so the
* code has some added complexity to support older approaches.
*
* Current approach: 'progress' is a dict with two entries:
* - 'pieces' a bitfield for whether each piece has been checked.
* - 'mtimes', an array of per-file timestamps
* On startup, 'pieces' is loaded. Then we check to see if the disk
* mtimes differ from the 'mtimes' list. Changed files have their
* pieces cleared from the bitset.
*
* Second approach (2.20 - 3.00): the 'progress' dict had a
* 'time_checked' entry which was a list with fileCount items.
* Each item was either a list of per-piece timestamps, or a
* single timestamp if either all or none of the pieces had been
* tested more recently than the file's mtime.
*
* First approach (pre-2.20) had an "mtimes" list identical to
* 3.10, but not the 'pieces' bitfield.
*/
auto loadProgress(tr_variant* dict, tr_torrent* tor)
{
if (tr_variant* prog = nullptr; tr_variantDictFindDict(dict, TR_KEY_progress, &prog))
{
/// CHECKED PIECES
auto checked = tr_bitfield(tor->piece_count());
auto mtimes = std::vector<time_t>{};
auto const n_files = tor->file_count();
mtimes.reserve(n_files);
// try to load mtimes
tr_variant* l = nullptr;
if (tr_variantDictFindList(prog, TR_KEY_mtimes, &l))
{
auto fi = size_t{};
auto t = int64_t{};
while (tr_variantGetInt(tr_variantListChild(l, fi++), &t))
{
mtimes.push_back(t);
}
}
// try to load the piece-checked bitfield
uint8_t const* raw = nullptr;
auto rawlen = size_t{};
if (tr_variantDictFindRaw(prog, TR_KEY_pieces, &raw, &rawlen))
{
rawToBitfield(checked, raw, rawlen);
}
// maybe it's a .resume file from [2.20 - 3.00] with the per-piece mtimes
if (tr_variantDictFindList(prog, TR_KEY_time_checked, &l))
{
for (tr_file_index_t fi = 0; fi < n_files; ++fi)
{
tr_variant* const b = tr_variantListChild(l, fi);
auto time_checked = time_t{};
if (b != nullptr && b->holds_alternative<int64_t>())
{
auto t = int64_t{};
tr_variantGetInt(b, &t);
time_checked = time_t(t);
}
else if (b != nullptr && b->holds_alternative<tr_variant::Vector>())
{
auto offset = int64_t{};
tr_variantGetInt(tr_variantListChild(b, 0), &offset);
time_checked = tr_time();
auto const [begin, end] = tor->pieces_in_file(fi);
for (size_t i = 0, n = end - begin; i < n; ++i)
{
int64_t piece_time = 0;
tr_variantGetInt(tr_variantListChild(b, i + 1), &piece_time);
time_checked = std::min(time_checked, time_t(piece_time));
}
}
mtimes.push_back(time_checked);
}
}
if (std::size(mtimes) != n_files)
{
tr_logAddDebugTor(tor, fmt::format("Couldn't load mtimes: expected {} got {}", std::size(mtimes), n_files));
// if resizing grows the vector, we'll get 0 mtimes for the
// new items which is exactly what we want since the pieces
// in an unknown state should be treated as untested
mtimes.resize(n_files);
}
tor->init_checked_pieces(checked, std::data(mtimes));
/// COMPLETION
auto blocks = tr_bitfield{ tor->block_count() };
char const* err = nullptr;
if (tr_variant const* const b = tr_variantDictFind(prog, TR_KEY_blocks); b != nullptr)
{
uint8_t const* buf = nullptr;
auto buflen = size_t{};
if (!tr_variantGetRaw(b, &buf, &buflen))
{
err = "Invalid value for \"blocks\"";
}
else
{
rawToBitfield(blocks, buf, buflen);
}
}
else if (auto sv = std::string_view{}; tr_variantDictFindStrView(prog, TR_KEY_have, &sv))
{
if (sv == "all"sv)
{
blocks.set_has_all();
}
else
{
err = "Invalid value for HAVE";
}
}
else if (tr_variantDictFindRaw(prog, TR_KEY_bitfield, &raw, &rawlen))
{
blocks.set_raw(raw, rawlen);
}
else
{
err = "Couldn't find 'pieces' or 'have' or 'bitfield'";
}
if (err != nullptr)
{
tr_logAddDebugTor(tor, fmt::format("Torrent needs to be verified - {}", err));
}
else
{
tor->set_blocks(blocks);
}
return tr_resume::Progress;
}
return tr_resume::fields_t{};
}
// ---
tr_resume::fields_t loadFromFile(tr_torrent* tor, tr_resume::fields_t fields_to_load)
{
TR_ASSERT(tr_isTorrent(tor));
auto const was_dirty = tor->is_dirty();
tr_torrent_metainfo::migrate_file(tor->session->resumeDir(), tor->name(), tor->info_hash_string(), ".resume"sv);
auto const filename = tor->resume_file();
if (!tr_sys_path_exists(filename))
{
return {};
}
auto serde = tr_variant_serde::benc();
auto otop = serde.parse_file(filename);
if (!otop)
{
tr_logAddDebugTor(tor, fmt::format("Couldn't read '{}': {}", filename, serde.error_->message));
return {};
}
auto& top = *otop;
tr_logAddDebugTor(tor, fmt::format("Read resume file '{}'", filename));
auto fields_loaded = tr_resume::fields_t{};
auto i = int64_t{};
auto sv = std::string_view{};
if ((fields_to_load & tr_resume::Corrupt) != 0 && tr_variantDictFindInt(&top, TR_KEY_corrupt, &i))
{
tor->corruptPrev = i;
fields_loaded |= tr_resume::Corrupt;
}
if ((fields_to_load & (tr_resume::Progress | tr_resume::DownloadDir)) != 0 &&
tr_variantDictFindStrView(&top, TR_KEY_destination, &sv) && !std::empty(sv))
{
bool const is_current_dir = tor->current_dir() == tor->download_dir();
tor->download_dir_ = sv;
if (is_current_dir)
{
tor->current_dir_ = sv;
}
fields_loaded |= tr_resume::DownloadDir;
}
if ((fields_to_load & (tr_resume::Progress | tr_resume::IncompleteDir)) != 0 &&
tr_variantDictFindStrView(&top, TR_KEY_incomplete_dir, &sv) && !std::empty(sv))
{
bool const is_current_dir = tor->current_dir() == tor->incomplete_dir();
tor->incomplete_dir_ = sv;
if (is_current_dir)
{
tor->current_dir_ = sv;
}
fields_loaded |= tr_resume::IncompleteDir;
}
if ((fields_to_load & tr_resume::Downloaded) != 0 && tr_variantDictFindInt(&top, TR_KEY_downloaded, &i))
{
tor->downloadedPrev = i;
fields_loaded |= tr_resume::Downloaded;
}
if ((fields_to_load & tr_resume::Uploaded) != 0 && tr_variantDictFindInt(&top, TR_KEY_uploaded, &i))
{
tor->uploadedPrev = i;
fields_loaded |= tr_resume::Uploaded;
}
if ((fields_to_load & tr_resume::MaxPeers) != 0 && tr_variantDictFindInt(&top, TR_KEY_max_peers, &i))
{
tor->max_connected_peers_ = static_cast<uint16_t>(i);
fields_loaded |= tr_resume::MaxPeers;
}
if (auto val = bool{}; (fields_to_load & tr_resume::Run) != 0 && tr_variantDictFindBool(&top, TR_KEY_paused, &val))
{
tor->start_when_stable = !val;
fields_loaded |= tr_resume::Run;
}
if ((fields_to_load & tr_resume::AddedDate) != 0 && tr_variantDictFindInt(&top, TR_KEY_added_date, &i))
{
tor->addedDate = i;
fields_loaded |= tr_resume::AddedDate;
}
if ((fields_to_load & tr_resume::DoneDate) != 0 && tr_variantDictFindInt(&top, TR_KEY_done_date, &i))
{
tor->doneDate = i;
fields_loaded |= tr_resume::DoneDate;
}
if ((fields_to_load & tr_resume::ActivityDate) != 0 && tr_variantDictFindInt(&top, TR_KEY_activity_date, &i))
{
tor->set_date_active(i);
fields_loaded |= tr_resume::ActivityDate;
}
if ((fields_to_load & tr_resume::TimeSeeding) != 0 && tr_variantDictFindInt(&top, TR_KEY_seeding_time_seconds, &i))
{
tor->seconds_seeding_before_current_start_ = i;
fields_loaded |= tr_resume::TimeSeeding;
}
if ((fields_to_load & tr_resume::TimeDownloading) != 0 && tr_variantDictFindInt(&top, TR_KEY_downloading_time_seconds, &i))
{
tor->seconds_downloading_before_current_start_ = i;
fields_loaded |= tr_resume::TimeDownloading;
}
if ((fields_to_load & tr_resume::BandwidthPriority) != 0 && tr_variantDictFindInt(&top, TR_KEY_bandwidth_priority, &i) &&
tr_isPriority(i))
{
tr_torrentSetPriority(tor, i);
fields_loaded |= tr_resume::BandwidthPriority;
}
if ((fields_to_load & tr_resume::Peers) != 0)
{
fields_loaded |= loadPeers(&top, tor);
}
// Note: loadFilenames() must come before loadProgress()
// so that loadProgress() -> tor->initCheckedPieces() -> tor->findFile()
// will know where to look
if ((fields_to_load & tr_resume::Filenames) != 0)
{
fields_loaded |= loadFilenames(&top, tor);
}
// Note: loadProgress should come before loadFilePriorities()
// so that we can skip loading priorities iff the torrent is a
// seed or a partial seed.
if ((fields_to_load & tr_resume::Progress) != 0)
{
fields_loaded |= loadProgress(&top, tor);
}
if (!tor->is_done() && (fields_to_load & tr_resume::FilePriorities) != 0)
{
fields_loaded |= loadFilePriorities(&top, tor);
}
if ((fields_to_load & tr_resume::Dnd) != 0)
{
fields_loaded |= loadDND(&top, tor);
}
if ((fields_to_load & tr_resume::Speedlimit) != 0)
{
fields_loaded |= loadSpeedLimits(&top, tor);
}
if ((fields_to_load & tr_resume::Ratiolimit) != 0)
{
fields_loaded |= loadRatioLimits(&top, tor);
}
if ((fields_to_load & tr_resume::Idlelimit) != 0)
{
fields_loaded |= loadIdleLimits(&top, tor);
}
if ((fields_to_load & tr_resume::Name) != 0)
{
fields_loaded |= loadName(&top, tor);
}
if ((fields_to_load & tr_resume::Labels) != 0)
{
fields_loaded |= loadLabels(&top, tor);
}
if ((fields_to_load & tr_resume::Group) != 0)
{
fields_loaded |= loadGroup(&top, tor);
}
/* loading the resume file triggers of a lot of changes,
* but none of them needs to trigger a re-saving of the
* same resume information... */
tor->set_dirty(was_dirty);
return fields_loaded;
}
auto setFromCtor(tr_torrent* tor, tr_resume::fields_t fields, tr_ctor const* ctor, tr_ctorMode mode)
{
auto ret = tr_resume::fields_t{};
if ((fields & tr_resume::Run) != 0)
{
if (auto is_paused = bool{}; tr_ctorGetPaused(ctor, mode, &is_paused))
{
tor->start_when_stable = !is_paused;
ret |= tr_resume::Run;
}
}
if (((fields & tr_resume::MaxPeers) != 0) && tr_ctorGetPeerLimit(ctor, mode, &tor->max_connected_peers_))
{
ret |= tr_resume::MaxPeers;
}
if ((fields & tr_resume::DownloadDir) != 0)
{
char const* path = nullptr;
if (tr_ctorGetDownloadDir(ctor, mode, &path) && !tr_str_is_empty(path))
{
ret |= tr_resume::DownloadDir;
tor->download_dir_ = path;
}
}
return ret;
}
auto useMandatoryFields(tr_torrent* tor, tr_resume::fields_t fields, tr_ctor const* ctor)
{
return setFromCtor(tor, fields, ctor, TR_FORCE);
}
auto useFallbackFields(tr_torrent* tor, tr_resume::fields_t fields, tr_ctor const* ctor)
{
return setFromCtor(tor, fields, ctor, TR_FALLBACK);
}
} // namespace
fields_t load(tr_torrent* tor, fields_t fields_to_load, tr_ctor const* ctor)
{
TR_ASSERT(tr_isTorrent(tor));
auto ret = fields_t{};
ret |= useMandatoryFields(tor, fields_to_load, ctor);
fields_to_load &= ~ret;
ret |= loadFromFile(tor, fields_to_load);
fields_to_load &= ~ret;
ret |= useFallbackFields(tor, fields_to_load, ctor);
return ret;
}
void save(tr_torrent* tor)
{
if (!tr_isTorrent(tor))
{
return;
}
auto top = tr_variant{};
auto const now = tr_time();
tr_variantInitDict(&top, 50); /* arbitrary "big enough" number */
tr_variantDictAddInt(&top, TR_KEY_seeding_time_seconds, tor->seconds_seeding(now));
tr_variantDictAddInt(&top, TR_KEY_downloading_time_seconds, tor->seconds_downloading(now));
tr_variantDictAddInt(&top, TR_KEY_activity_date, tor->activityDate);
tr_variantDictAddInt(&top, TR_KEY_added_date, tor->addedDate);
tr_variantDictAddInt(&top, TR_KEY_corrupt, tor->corruptPrev + tor->corruptCur);
tr_variantDictAddInt(&top, TR_KEY_done_date, tor->doneDate);
tr_variantDictAddQuark(&top, TR_KEY_destination, tor->download_dir().quark());
if (!std::empty(tor->incomplete_dir()))
{
tr_variantDictAddQuark(&top, TR_KEY_incomplete_dir, tor->incomplete_dir().quark());
}
tr_variantDictAddInt(&top, TR_KEY_downloaded, tor->downloadedPrev + tor->downloadedCur);
tr_variantDictAddInt(&top, TR_KEY_uploaded, tor->uploadedPrev + tor->uploadedCur);
tr_variantDictAddInt(&top, TR_KEY_max_peers, tor->peer_limit());
tr_variantDictAddInt(&top, TR_KEY_bandwidth_priority, tor->get_priority());
tr_variantDictAddBool(&top, TR_KEY_paused, !tor->start_when_stable);
tr_variantDictAddBool(&top, TR_KEY_sequentialDownload, tor->is_sequential_download());
savePeers(&top, tor);
if (tor->has_metainfo())
{
saveFilePriorities(&top, tor);
saveDND(&top, tor);
saveProgress(&top, tor);
}
saveSpeedLimits(&top, tor);
saveRatioLimits(&top, tor);
saveIdleLimits(&top, tor);
saveFilenames(&top, tor);
saveName(&top, tor);
saveLabels(&top, tor);
saveGroup(&top, tor);
auto serde = tr_variant_serde::benc();
if (!serde.to_file(top, tor->resume_file()))
{
tor->error().set_local_error(fmt::format("Unable to save resume file: {:s}", serde.error_->message));
}
}
} // namespace tr_resume
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