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transmission/libtransmission/torrent.cc

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// This file Copyright © 2009-2022 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 <algorithm>
#include <array>
#include <cerrno> // EINVAL
#include <climits> /* INT_MAX */
#include <csignal> /* signal() */
#include <ctime>
#include <map>
#include <sstream>
#include <string>
#include <string_view>
#include <unordered_map>
#include <utility>
#include <vector>
#ifndef _WIN32
#include <sys/wait.h> /* wait() */
#include <unistd.h> /* fork(), execvp(), _exit() */
#else
#include <windows.h> /* CreateProcess(), GetLastError() */
#endif
#include <event2/util.h> /* evutil_vsnprintf() */
#include <fmt/chrono.h>
#include <fmt/core.h>
#include "transmission.h"
#include "announcer.h"
#include "bandwidth.h"
#include "completion.h"
#include "crypto-utils.h" /* for tr_sha1 */
#include "error.h"
#include "file.h"
#include "inout.h" /* tr_ioTestPiece() */
#include "log.h"
#include "magnet-metainfo.h"
#include "peer-mgr.h"
#include "resume.h"
#include "session.h"
#include "subprocess.h"
#include "torrent-magnet.h"
#include "torrent-metainfo.h"
#include "torrent.h"
#include "tr-assert.h"
#include "trevent.h" /* tr_runInEventThread() */
#include "utils.h"
#include "version.h"
#include "web-utils.h"
using namespace std::literals;
/***
****
***/
char const* tr_torrentName(tr_torrent const* tor)
{
return tor != nullptr ? tor->name().c_str() : "";
}
uint64_t tr_torrentTotalSize(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->totalSize();
}
tr_torrent_id_t tr_torrentId(tr_torrent const* tor)
{
return tor != nullptr ? tor->id() : -1;
}
tr_torrent* tr_torrentFindFromId(tr_session* session, int id)
{
return session->torrents().get(id);
}
tr_torrent* tr_torrentFindFromMetainfo(tr_session* session, tr_torrent_metainfo const* metainfo)
{
if (session == nullptr || metainfo == nullptr)
{
return nullptr;
}
return session->torrents().get(metainfo->infoHash());
}
tr_torrent* tr_torrentFindFromMagnetLink(tr_session* session, char const* magnet_link)
{
return magnet_link == nullptr ? nullptr : session->torrents().get(magnet_link);
}
tr_torrent* tr_torrentFindFromObfuscatedHash(tr_session* session, tr_sha1_digest_t const& obfuscated_hash)
{
for (auto* const tor : session->torrents())
{
if (tor->obfuscated_hash == obfuscated_hash)
{
return tor;
}
}
return nullptr;
}
bool tr_torrentSetMetainfoFromFile(tr_torrent* tor, tr_torrent_metainfo const* metainfo, char const* filename)
{
if (tr_torrentHasMetadata(tor))
{
return false;
}
tr_error* error = nullptr;
tr_torrentUseMetainfoFromFile(tor, metainfo, filename, &error);
if (error != nullptr)
{
tor->setLocalError(fmt::format(
_("Couldn't use metaInfo from '{path}' for '{magnet}': {error} ({error_code})"),
fmt::arg("path", filename),
fmt::arg("magnet", tor->magnet()),
fmt::arg("error", error->message),
fmt::arg("error_code", error->code)));
tr_error_clear(&error);
return false;
}
return true;
}
bool tr_torrent::isPieceTransferAllowed(tr_direction direction) const
{
TR_ASSERT(tr_isDirection(direction));
if (tr_torrentUsesSpeedLimit(this, direction) && this->speedLimitBps(direction) <= 0)
{
return false;
}
if (tr_torrentUsesSessionLimits(this))
{
if (auto const limit = session->activeSpeedLimitBps(direction); limit && *limit == 0U)
{
return false;
}
}
return true;
}
/***
****
***/
static void tr_torrentUnsetPeerId(tr_torrent* tor)
{
// triggers a rebuild next time tr_torrentGetPeerId() is called
tor->peer_id_ = {};
}
static int peerIdTTL(tr_torrent const* tor)
{
auto const ctime = tor->peer_id_creation_time_;
return ctime == 0 ? 0 : (int)difftime(ctime + tor->session->peerIdTTLHours() * 3600, tr_time());
}
tr_peer_id_t const& tr_torrentGetPeerId(tr_torrent* tor)
{
bool const needs_new_peer_id = tor->peer_id_[0] == '\0' || // doesn't have one
(tor->isPublic() && (peerIdTTL(tor) <= 0)); // has one but it's expired
if (needs_new_peer_id)
{
tor->peer_id_ = tr_peerIdInit();
tor->peer_id_creation_time_ = tr_time();
}
return tor->peer_id_;
}
/***
**** PER-TORRENT UL / DL SPEEDS
***/
void tr_torrent::setSpeedLimitBps(tr_direction dir, unsigned int bytes_per_second)
{
TR_ASSERT(tr_isDirection(dir));
if (this->bandwidth_.setDesiredSpeedBytesPerSecond(dir, bytes_per_second))
{
this->setDirty();
}
}
void tr_torrentSetSpeedLimit_KBps(tr_torrent* tor, tr_direction dir, unsigned int kilo_per_second)
{
tor->setSpeedLimitBps(dir, tr_toSpeedBytes(kilo_per_second));
}
unsigned int tr_torrent::speedLimitBps(tr_direction dir) const
{
TR_ASSERT(tr_isDirection(dir));
return this->bandwidth_.getDesiredSpeedBytesPerSecond(dir);
}
unsigned int tr_torrentGetSpeedLimit_KBps(tr_torrent const* tor, tr_direction dir)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tr_isDirection(dir));
return tr_toSpeedKBps(tor->speedLimitBps(dir));
}
void tr_torrentUseSpeedLimit(tr_torrent* tor, tr_direction dir, bool do_use)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tr_isDirection(dir));
if (tor->bandwidth_.setLimited(dir, do_use))
{
tor->setDirty();
}
}
bool tr_torrentUsesSpeedLimit(tr_torrent const* tor, tr_direction dir)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->bandwidth_.isLimited(dir);
}
void tr_torrentUseSessionLimits(tr_torrent* tor, bool do_use)
{
TR_ASSERT(tr_isTorrent(tor));
if (tor->bandwidth_.honorParentLimits(TR_UP, do_use) || tor->bandwidth_.honorParentLimits(TR_DOWN, do_use))
{
tor->setDirty();
}
}
bool tr_torrentUsesSessionLimits(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->bandwidth_.areParentLimitsHonored(TR_UP);
}
/***
****
***/
void tr_torrentSetRatioMode(tr_torrent* tor, tr_ratiolimit mode)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(mode == TR_RATIOLIMIT_GLOBAL || mode == TR_RATIOLIMIT_SINGLE || mode == TR_RATIOLIMIT_UNLIMITED);
if (mode != tor->ratioLimitMode)
{
tor->ratioLimitMode = mode;
tor->setDirty();
}
}
tr_ratiolimit tr_torrentGetRatioMode(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->ratioLimitMode;
}
void tr_torrentSetRatioLimit(tr_torrent* tor, double desired_ratio)
{
TR_ASSERT(tr_isTorrent(tor));
if ((int)(desired_ratio * 100.0) != (int)(tor->desiredRatio * 100.0))
{
tor->desiredRatio = desired_ratio;
tor->setDirty();
}
}
double tr_torrentGetRatioLimit(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->desiredRatio;
}
bool tr_torrentGetSeedRatio(tr_torrent const* tor, double* ratio)
{
auto is_limited = bool{};
TR_ASSERT(tr_isTorrent(tor));
switch (tr_torrentGetRatioMode(tor))
{
case TR_RATIOLIMIT_SINGLE:
is_limited = true;
if (ratio != nullptr)
{
*ratio = tr_torrentGetRatioLimit(tor);
}
break;
case TR_RATIOLIMIT_GLOBAL:
is_limited = tor->session->isRatioLimited();
if (is_limited && ratio != nullptr)
{
*ratio = tor->session->desiredRatio();
}
break;
default: /* TR_RATIOLIMIT_UNLIMITED */
is_limited = false;
break;
}
return is_limited;
}
/* returns true if the seed ratio applies --
* it applies if the torrent's a seed AND it has a seed ratio set */
static bool tr_torrentGetSeedRatioBytes(tr_torrent const* tor, uint64_t* setme_left, uint64_t* setme_goal)
{
bool seed_ratio_applies = false;
TR_ASSERT(tr_isTorrent(tor));
if (auto seed_ratio = double{}; tr_torrentGetSeedRatio(tor, &seed_ratio))
{
auto const uploaded = tor->uploadedCur + tor->uploadedPrev;
auto const baseline = tor->sizeWhenDone();
auto const goal = baseline * seed_ratio;
if (setme_left != nullptr)
{
*setme_left = goal > uploaded ? goal - uploaded : 0;
}
if (setme_goal != nullptr)
{
*setme_goal = goal;
}
seed_ratio_applies = tor->isDone();
}
return seed_ratio_applies;
}
static bool tr_torrentIsSeedRatioDone(tr_torrent const* tor)
{
auto bytes_left = uint64_t{};
return tr_torrentGetSeedRatioBytes(tor, &bytes_left, nullptr) && bytes_left == 0;
}
/***
****
***/
void tr_torrentSetIdleMode(tr_torrent* tor, tr_idlelimit mode)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(mode == TR_IDLELIMIT_GLOBAL || mode == TR_IDLELIMIT_SINGLE || mode == TR_IDLELIMIT_UNLIMITED);
if (mode != tor->idleLimitMode)
{
tor->idleLimitMode = mode;
tor->setDirty();
}
}
tr_idlelimit tr_torrentGetIdleMode(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->idleLimitMode;
}
void tr_torrentSetIdleLimit(tr_torrent* tor, uint16_t idle_minutes)
{
TR_ASSERT(tr_isTorrent(tor));
if (idle_minutes > 0)
{
tor->idleLimitMinutes = idle_minutes;
tor->setDirty();
}
}
uint16_t tr_torrentGetIdleLimit(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->idleLimitMinutes;
}
bool tr_torrentGetSeedIdle(tr_torrent const* tor, uint16_t* idle_minutes)
{
auto is_limited = bool{};
switch (tr_torrentGetIdleMode(tor))
{
case TR_IDLELIMIT_SINGLE:
is_limited = true;
if (idle_minutes != nullptr)
{
*idle_minutes = tr_torrentGetIdleLimit(tor);
}
break;
case TR_IDLELIMIT_GLOBAL:
is_limited = tor->session->isIdleLimited();
if (is_limited && idle_minutes != nullptr)
{
*idle_minutes = tor->session->idleLimitMinutes();
}
break;
default: /* TR_IDLELIMIT_UNLIMITED */
is_limited = false;
break;
}
return is_limited;
}
static bool tr_torrentIsSeedIdleLimitDone(tr_torrent const* tor)
{
auto idle_minutes = uint16_t{};
return tr_torrentGetSeedIdle(tor, &idle_minutes) &&
difftime(tr_time(), std::max(tor->startDate, tor->activityDate)) >= idle_minutes * 60U;
}
static void torrentCallScript(tr_torrent const* tor, std::string const& script);
static void callScriptIfEnabled(tr_torrent const* tor, TrScript type)
{
auto const* session = tor->session;
if (tr_sessionIsScriptEnabled(session, type))
{
torrentCallScript(tor, session->script(type));
}
}
/***
****
***/
void tr_torrentCheckSeedLimit(tr_torrent* tor)
{
TR_ASSERT(tr_isTorrent(tor));
if (!tor->isRunning || tor->isStopping || !tor->isDone())
{
return;
}
/* if we're seeding and reach our seed ratio limit, stop the torrent */
if (tr_torrentIsSeedRatioDone(tor))
{
tr_logAddInfoTor(tor, _("Seed ratio reached; pausing torrent"));
tor->isStopping = true;
tor->session->onRatioLimitHit(tor);
}
/* if we're seeding and reach our inactivity limit, stop the torrent */
else if (tr_torrentIsSeedIdleLimitDone(tor))
{
tr_logAddInfoTor(tor, _("Seeding idle limit reached; pausing torrent"));
tor->isStopping = true;
tor->finishedSeedingByIdle = true;
tor->session->onIdleLimitHit(tor);
}
if (tor->isStopping)
{
callScriptIfEnabled(tor, TR_SCRIPT_ON_TORRENT_DONE_SEEDING);
}
}
/***
****
***/
static void tr_torrentClearError(tr_torrent* tor)
{
tor->error = TR_STAT_OK;
tor->error_announce_url.clear();
tor->error_string.clear();
}
static void onTrackerResponse(tr_torrent* tor, tr_tracker_event const* event, void* /*user_data*/)
{
switch (event->messageType)
{
case TR_TRACKER_PEERS:
tr_logAddTraceTor(tor, fmt::format("Got {} peers from tracker", std::size(event->pex)));
tr_peerMgrAddPex(tor, TR_PEER_FROM_TRACKER, std::data(event->pex), std::size(event->pex));
break;
case TR_TRACKER_COUNTS:
if (tor->isPrivate() && (event->leechers == 0))
{
tr_peerMgrSetSwarmIsAllSeeds(tor);
}
break;
case TR_TRACKER_WARNING:
tr_logAddWarnTor(tor, fmt::format(_("Tracker warning: '{warning}'"), fmt::arg("warning", event->text)));
tor->error = TR_STAT_TRACKER_WARNING;
tor->error_announce_url = event->announce_url;
tor->error_string = event->text;
break;
case TR_TRACKER_ERROR:
tor->error = TR_STAT_TRACKER_ERROR;
tor->error_announce_url = event->announce_url;
tor->error_string = event->text;
break;
case TR_TRACKER_ERROR_CLEAR:
if (tor->error != TR_STAT_LOCAL_ERROR)
{
tr_torrentClearError(tor);
}
break;
}
}
/***
****
**** TORRENT INSTANTIATION
****
***/
struct torrent_start_opts
{
bool bypass_queue = false;
// true or false if we know whether or not local data exists,
// or unset if we don't know and need to check for ourselves
std::optional<bool> has_local_data;
};
static void torrentStart(tr_torrent* tor, torrent_start_opts opts);
static void torrentInitFromInfoDict(tr_torrent* tor)
{
tor->completion = tr_completion{ tor, &tor->blockInfo() };
tor->obfuscated_hash = tr_sha1::digest("req2"sv, tor->infoHash());
tor->fpm_.reset(tor->metainfo_);
tor->file_mtimes_.resize(tor->fileCount());
tor->file_priorities_.reset(&tor->fpm_);
tor->files_wanted_.reset(&tor->fpm_);
tor->checked_pieces_ = tr_bitfield{ size_t(tor->pieceCount()) };
}
void tr_torrent::setMetainfo(tr_torrent_metainfo const& tm)
{
metainfo_ = tm;
torrentInitFromInfoDict(this);
tr_peerMgrOnTorrentGotMetainfo(this);
session->onMetadataCompleted(this);
this->setDirty();
}
static size_t buildSearchPathArray(tr_torrent const* tor, std::string_view* paths)
{
auto* walk = paths;
if (auto const& path = tor->downloadDir(); !std::empty(path))
{
*walk++ = path.sv();
}
if (auto const& path = tor->incompleteDir(); !std::empty(path))
{
*walk++ = path.sv();
}
return walk - paths;
}
std::optional<tr_torrent_files::FoundFile> tr_torrent::findFile(tr_file_index_t file_index) const
{
auto paths = std::array<std::string_view, 4>{};
auto const n_paths = buildSearchPathArray(this, std::data(paths));
return metainfo_.files().find(file_index, std::data(paths), n_paths);
}
bool tr_torrent::hasAnyLocalData() const
{
auto paths = std::array<std::string_view, 4>{};
auto const n_paths = buildSearchPathArray(this, std::data(paths));
return metainfo_.files().hasAnyLocalData(std::data(paths), n_paths);
}
static bool setLocalErrorIfFilesDisappeared(tr_torrent* tor, std::optional<bool> has_local_data = {})
{
auto const has = has_local_data ? *has_local_data : tor->hasAnyLocalData();
bool const files_disappeared = tor->hasTotal() > 0 && !has;
if (files_disappeared)
{
tr_logAddTraceTor(tor, "[LAZY] uh oh, the files disappeared");
tor->setLocalError(_(
"No data found! Ensure your drives are connected or use \"Set Location\". To re-download, remove the torrent and re-add it."));
}
return files_disappeared;
}
/**
* Sniff out newly-added seeds so that they can skip the verify step
*/
static bool isNewTorrentASeed(tr_torrent* tor)
{
if (!tor->hasMetainfo())
{
return false;
}
for (tr_file_index_t i = 0, n = tor->fileCount(); i < n; ++i)
{
// it's not a new seed if a file is missing
auto const found = tor->findFile(i);
if (!found)
{
return false;
}
// it's not a new seed if a file is partial
if (tr_strvEndsWith(found->filename(), tr_torrent_files::PartialFileSuffix))
{
return false;
}
// it's not a new seed if a file size is wrong
if (found->size != tor->fileSize(i))
{
return false;
}
// it's not a new seed if it was modified after it was added
if (found->last_modified_at >= tor->addedDate)
{
return false;
}
}
// check the first piece
return tor->ensurePieceIsChecked(0);
}
static void torrentInit(tr_torrent* tor, tr_ctor const* ctor)
{
tr_session* session = tr_ctorGetSession(ctor);
TR_ASSERT(session != nullptr);
tor->session = session;
auto const lock = tor->unique_lock();
tor->queuePosition = std::size(session->torrents());
torrentInitFromInfoDict(tor);
char const* dir = nullptr;
if (tr_ctorGetDownloadDir(ctor, TR_FORCE, &dir) || tr_ctorGetDownloadDir(ctor, TR_FALLBACK, &dir))
{
tor->download_dir = dir;
}
if (!tr_ctorGetIncompleteDir(ctor, &dir))
{
dir = tr_sessionGetIncompleteDir(session);
}
if (tr_sessionIsIncompleteDirEnabled(session))
{
tor->incomplete_dir = dir;
}
tor->bandwidth_.setParent(&session->top_bandwidth_);
tor->bandwidth_.setPriority(tr_ctorGetBandwidthPriority(ctor));
tor->error = TR_STAT_OK;
tor->finishedSeedingByIdle = false;
auto const& labels = tr_ctorGetLabels(ctor);
tor->setLabels(labels);
tor->unique_id_ = session->torrents().add(tor);
tr_peerMgrAddTorrent(session->peerMgr, tor);
TR_ASSERT(tor->downloadedCur == 0);
TR_ASSERT(tor->uploadedCur == 0);
auto const now = tr_time();
tor->addedDate = now; // this is a default that will be overwritten by the resume file
tor->anyDate = now;
tr_resume::fields_t loaded = {};
if (tor->hasMetainfo())
{
// tr_resume::load() calls a lot of tr_torrentSetFoo() methods
// that set things as dirty, but... these settings being loaded are
// the same ones that would be saved back again, so don't let them
// affect the 'is dirty' flag.
auto const was_dirty = tor->isDirty;
bool resume_file_was_migrated = false;
loaded = tr_resume::load(tor, tr_resume::All, ctor, &resume_file_was_migrated);
tor->isDirty = was_dirty;
if (resume_file_was_migrated)
{
tr_torrent_metainfo::migrateFile(session->torrentDir(), tor->name(), tor->infoHashString(), ".torrent"sv);
}
}
tor->completeness = tor->completion.status();
tr_ctorInitTorrentPriorities(ctor, tor);
tr_ctorInitTorrentWanted(ctor, tor);
tor->refreshCurrentDir();
bool const do_start = tor->isRunning;
tor->isRunning = false;
if ((loaded & tr_resume::Speedlimit) == 0)
{
tr_torrentUseSpeedLimit(tor, TR_UP, false);
tor->setSpeedLimitBps(TR_UP, tor->session->speedLimitBps(TR_UP));
tr_torrentUseSpeedLimit(tor, TR_DOWN, false);
tor->setSpeedLimitBps(TR_DOWN, tor->session->speedLimitBps(TR_DOWN));
tr_torrentUseSessionLimits(tor, true);
}
if ((loaded & tr_resume::Ratiolimit) == 0)
{
tr_torrentSetRatioMode(tor, TR_RATIOLIMIT_GLOBAL);
tr_torrentSetRatioLimit(tor, tor->session->desiredRatio());
}
if ((loaded & tr_resume::Idlelimit) == 0)
{
tr_torrentSetIdleMode(tor, TR_IDLELIMIT_GLOBAL);
tr_torrentSetIdleLimit(tor, tor->session->idleLimitMinutes());
}
auto has_local_data = std::optional<bool>{};
if ((loaded & tr_resume::Progress) != 0)
{
// if tr_resume::load() loaded progress info, then initCheckedPieces()
// has already looked for local data on the filesystem
has_local_data = std::any_of(
std::begin(tor->file_mtimes_),
std::end(tor->file_mtimes_),
[](auto mtime) { return mtime > 0; });
}
auto const filename = tor->hasMetainfo() ? tor->torrentFile() : tor->magnetFile();
// if we don't have a local .torrent or .magnet file already,
// assume the torrent is new
bool const is_new_torrent = !tr_sys_path_exists(filename);
if (is_new_torrent)
{
tr_error* error = nullptr;
if (tor->hasMetainfo()) // torrent file
{
tr_ctorSaveContents(ctor, filename, &error);
}
else // magnet link
{
auto const magnet_link = tor->magnet();
tr_saveFile(filename, magnet_link, &error);
}
if (error != nullptr)
{
tor->setLocalError(fmt::format(
_("Couldn't save '{path}': {error} ({error_code})"),
fmt::arg("path", filename),
fmt::arg("error", error->message),
fmt::arg("error_code", error->code)));
tr_error_clear(&error);
}
}
tor->torrent_announcer = tr_announcerAddTorrent(tor, onTrackerResponse, nullptr);
if (is_new_torrent)
{
if (tor->hasMetainfo())
{
callScriptIfEnabled(tor, TR_SCRIPT_ON_TORRENT_ADDED);
}
if (!tor->hasMetainfo() && !do_start)
{
auto opts = torrent_start_opts{};
opts.bypass_queue = true;
opts.has_local_data = has_local_data;
torrentStart(tor, opts);
}
else if (isNewTorrentASeed(tor))
{
tor->completion.setHasAll();
tor->doneDate = tor->addedDate;
tor->recheckCompleteness();
}
else
{
tor->startAfterVerify = do_start;
tr_torrentVerify(tor);
}
}
else if (do_start)
{
// if checked_pieces_ got populated from the loading the resume
// file above, then torrentStart doesn't need to check again
auto opts = torrent_start_opts{};
opts.has_local_data = has_local_data;
torrentStart(tor, opts);
}
else
{
setLocalErrorIfFilesDisappeared(tor, has_local_data);
}
}
tr_torrent* tr_torrentNew(tr_ctor* ctor, tr_torrent** setme_duplicate_of)
{
TR_ASSERT(ctor != nullptr);
auto* const session = tr_ctorGetSession(ctor);
TR_ASSERT(session != nullptr);
// is the metainfo valid?
auto metainfo = tr_ctorStealMetainfo(ctor);
if (std::empty(metainfo.infoHashString()))
{
return nullptr;
}
// is it a duplicate?
if (auto* const duplicate_of = session->torrents().get(metainfo.infoHash()); duplicate_of != nullptr)
{
if (setme_duplicate_of != nullptr)
{
*setme_duplicate_of = duplicate_of;
}
return nullptr;
}
auto* const tor = new tr_torrent{ std::move(metainfo) };
torrentInit(tor, ctor);
return tor;
}
/**
***
**/
void tr_torrentSetDownloadDir(tr_torrent* tor, char const* path)
{
TR_ASSERT(tr_isTorrent(tor));
if (tor->download_dir != path)
{
tor->setDownloadDir(path);
}
}
char const* tr_torrentGetDownloadDir(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->downloadDir().c_str();
}
char const* tr_torrentGetCurrentDir(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->currentDir().c_str();
}
void tr_torrentChangeMyPort(tr_torrent* tor)
{
TR_ASSERT(tr_isTorrent(tor));
if (tor->isRunning)
{
tr_announcerChangeMyPort(tor);
}
}
static inline void tr_torrentManualUpdateImpl(tr_torrent* const tor)
{
TR_ASSERT(tr_isTorrent(tor));
if (tor->isRunning)
{
tr_announcerManualAnnounce(tor);
}
}
void tr_torrentManualUpdate(tr_torrent* tor)
{
TR_ASSERT(tr_isTorrent(tor));
tr_runInEventThread(tor->session, tr_torrentManualUpdateImpl, tor);
}
bool tr_torrentCanManualUpdate(tr_torrent const* tor)
{
return tr_isTorrent(tor) && tor->isRunning && tr_announcerCanManualAnnounce(tor);
}
tr_stat const* tr_torrentStatCached(tr_torrent* tor)
{
time_t const now = tr_time();
return (tr_isTorrent(tor) && now == tor->lastStatTime) ? &tor->stats : tr_torrentStat(tor);
}
void tr_torrent::setVerifyState(tr_verify_state state)
{
TR_ASSERT(state == TR_VERIFY_NONE || state == TR_VERIFY_WAIT || state == TR_VERIFY_NOW);
this->verify_state_ = state;
this->verify_progress_ = {};
this->markChanged();
}
tr_torrent_activity tr_torrentGetActivity(tr_torrent const* tor)
{
tr_torrent_activity ret = TR_STATUS_STOPPED;
bool const is_seed = tor->isDone();
if (tor->verifyState() == TR_VERIFY_NOW)
{
ret = TR_STATUS_CHECK;
}
else if (tor->verifyState() == TR_VERIFY_WAIT)
{
ret = TR_STATUS_CHECK_WAIT;
}
else if (tor->isRunning)
{
ret = is_seed ? TR_STATUS_SEED : TR_STATUS_DOWNLOAD;
}
else if (tor->isQueued())
{
if (is_seed && tor->session->queueEnabled(TR_UP))
{
ret = TR_STATUS_SEED_WAIT;
}
else if (!is_seed && tor->session->queueEnabled(TR_DOWN))
{
ret = TR_STATUS_DOWNLOAD_WAIT;
}
}
return ret;
}
static int torrentGetIdleSecs(tr_torrent const* tor, tr_torrent_activity activity)
{
return ((activity == TR_STATUS_DOWNLOAD || activity == TR_STATUS_SEED) && tor->startDate != 0) ?
(int)difftime(tr_time(), std::max(tor->startDate, tor->activityDate)) :
-1;
}
static inline bool tr_torrentIsStalled(tr_torrent const* tor, int idle_secs)
{
return tor->session->queueStalledEnabled() && idle_secs > tor->session->queueStalledMinutes() * 60;
}
tr_stat const* tr_torrentStat(tr_torrent* tor)
{
TR_ASSERT(tr_isTorrent(tor));
uint64_t const now = tr_time_msec();
auto swarm_stats = tr_swarm_stats{};
tor->lastStatTime = tr_time();
if (tor->swarm != nullptr)
{
swarm_stats = tr_swarmGetStats(tor->swarm);
}
tr_stat* const s = &tor->stats;
s->id = tor->id();
s->activity = tr_torrentGetActivity(tor);
s->error = tor->error;
s->queuePosition = tor->queuePosition;
s->idleSecs = torrentGetIdleSecs(tor, s->activity);
s->isStalled = tr_torrentIsStalled(tor, s->idleSecs);
s->errorString = tor->error_string.c_str();
s->peersConnected = swarm_stats.peer_count;
s->peersSendingToUs = swarm_stats.active_peer_count[TR_DOWN];
s->peersGettingFromUs = swarm_stats.active_peer_count[TR_UP];
s->webseedsSendingToUs = swarm_stats.active_webseed_count;
for (int i = 0; i < TR_PEER_FROM__MAX; i++)
{
s->peersFrom[i] = swarm_stats.peer_from_count[i];
}
auto const piece_upload_speed_bytes_per_second = tor->bandwidth_.getPieceSpeedBytesPerSecond(now, TR_UP);
s->pieceUploadSpeed_KBps = tr_toSpeedKBps(piece_upload_speed_bytes_per_second);
auto const piece_download_speed_bytes_per_second = tor->bandwidth_.getPieceSpeedBytesPerSecond(now, TR_DOWN);
s->pieceDownloadSpeed_KBps = tr_toSpeedKBps(piece_download_speed_bytes_per_second);
s->percentComplete = tor->completion.percentComplete();
s->metadataPercentComplete = tr_torrentGetMetadataPercent(tor);
s->percentDone = tor->completion.percentDone();
s->leftUntilDone = tor->completion.leftUntilDone();
s->sizeWhenDone = tor->completion.sizeWhenDone();
auto const verify_progress = tor->verifyProgress();
s->recheckProgress = verify_progress ? *verify_progress : 0.0F;
s->activityDate = tor->activityDate;
s->addedDate = tor->addedDate;
s->doneDate = tor->doneDate;
s->editDate = tor->editDate;
s->startDate = tor->startDate;
s->secondsSeeding = tor->secondsSeeding;
s->secondsDownloading = tor->secondsDownloading;
s->corruptEver = tor->corruptCur + tor->corruptPrev;
s->downloadedEver = tor->downloadedCur + tor->downloadedPrev;
s->uploadedEver = tor->uploadedCur + tor->uploadedPrev;
s->haveValid = tor->completion.hasValid();
s->haveUnchecked = tor->hasTotal() - s->haveValid;
s->desiredAvailable = tr_peerMgrGetDesiredAvailable(tor);
s->ratio = tr_getRatio(s->uploadedEver, tor->sizeWhenDone());
auto seed_ratio_bytes_left = uint64_t{};
auto seed_ratio_bytes_goal = uint64_t{};
bool const seed_ratio_applies = tr_torrentGetSeedRatioBytes(tor, &seed_ratio_bytes_left, &seed_ratio_bytes_goal);
switch (s->activity)
{
/* etaSpeed exists because if we use the piece speed directly,
* brief fluctuations cause the ETA to jump all over the place.
* so, etaXLSpeed is a smoothed-out version of the piece speed
* to dampen the effect of fluctuations */
case TR_STATUS_DOWNLOAD:
if (tor->etaSpeedCalculatedAt + 800 < now)
{
tor->etaSpeed_Bps = tor->etaSpeedCalculatedAt + 4000 < now ?
piece_download_speed_bytes_per_second : /* if no recent previous speed, no need to smooth */
(tor->etaSpeed_Bps * 4.0 + piece_download_speed_bytes_per_second) / 5.0; /* smooth across 5 readings */
tor->etaSpeedCalculatedAt = now;
}
if (s->leftUntilDone > s->desiredAvailable && tor->webseedCount() < 1)
{
s->eta = TR_ETA_NOT_AVAIL;
}
else if (tor->etaSpeed_Bps == 0)
{
s->eta = TR_ETA_UNKNOWN;
}
else
{
s->eta = s->leftUntilDone / tor->etaSpeed_Bps;
}
s->etaIdle = TR_ETA_NOT_AVAIL;
break;
case TR_STATUS_SEED:
if (!seed_ratio_applies)
{
s->eta = TR_ETA_NOT_AVAIL;
}
else
{
if (tor->etaSpeedCalculatedAt + 800 < now)
{
tor->etaSpeed_Bps = tor->etaSpeedCalculatedAt + 4000 < now ?
piece_upload_speed_bytes_per_second : /* if no recent previous speed, no need to smooth */
(tor->etaSpeed_Bps * 4.0 + piece_upload_speed_bytes_per_second) / 5.0; /* smooth across 5 readings */
tor->etaSpeedCalculatedAt = now;
}
if (tor->etaSpeed_Bps == 0)
{
s->eta = TR_ETA_UNKNOWN;
}
else
{
s->eta = seed_ratio_bytes_left / tor->etaSpeed_Bps;
}
}
{
auto seed_idle_minutes = uint16_t{};
s->etaIdle = tor->etaSpeed_Bps < 1 && tr_torrentGetSeedIdle(tor, &seed_idle_minutes) ?
seed_idle_minutes * 60 - s->idleSecs :
TR_ETA_NOT_AVAIL;
}
break;
default:
s->eta = TR_ETA_NOT_AVAIL;
s->etaIdle = TR_ETA_NOT_AVAIL;
break;
}
/* s->haveValid is here to make sure a torrent isn't marked 'finished'
* when the user hits "uncheck all" prior to starting the torrent... */
s->finished = tor->finishedSeedingByIdle || (seed_ratio_applies && seed_ratio_bytes_left == 0 && s->haveValid != 0);
if (!seed_ratio_applies || s->finished)
{
s->seedRatioPercentDone = 1.0F;
}
else if (seed_ratio_bytes_goal == 0) /* impossible? safeguard for div by zero */
{
s->seedRatioPercentDone = 0.0F;
}
else
{
s->seedRatioPercentDone = float(seed_ratio_bytes_goal - seed_ratio_bytes_left) / seed_ratio_bytes_goal;
}
/* test some of the constraints */
TR_ASSERT(s->sizeWhenDone <= tor->totalSize());
TR_ASSERT(s->leftUntilDone <= s->sizeWhenDone);
TR_ASSERT(s->desiredAvailable <= s->leftUntilDone);
return s;
}
/***
****
***/
tr_file_view tr_torrentFile(tr_torrent const* tor, tr_file_index_t file)
{
TR_ASSERT(tr_isTorrent(tor));
auto const& subpath = tor->fileSubpath(file);
auto const priority = tor->file_priorities_.filePriority(file);
auto const wanted = tor->files_wanted_.fileWanted(file);
auto const length = tor->fileSize(file);
if (tor->completeness == TR_SEED || length == 0)
{
return { subpath.c_str(), length, length, 1.0, priority, wanted };
}
auto const have = tor->completion.countHasBytesInSpan(tor->fpm_.byteSpan(file));
return { subpath.c_str(), have, length, have >= length ? 1.0 : have / double(length), priority, wanted };
}
size_t tr_torrentFileCount(tr_torrent const* torrent)
{
TR_ASSERT(tr_isTorrent(torrent));
return torrent->fileCount();
}
tr_webseed_view tr_torrentWebseed(tr_torrent const* tor, size_t nth)
{
return tr_peerMgrWebseed(tor, nth);
}
size_t tr_torrentWebseedCount(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->webseedCount();
}
tr_tracker_view tr_torrentTracker(tr_torrent const* tor, size_t i)
{
return tr_announcerTracker(tor, i);
}
size_t tr_torrentTrackerCount(tr_torrent const* tor)
{
return tr_announcerTrackerCount(tor);
}
tr_torrent_view tr_torrentView(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
auto ret = tr_torrent_view{};
ret.name = tr_torrentName(tor);
ret.hash_string = tor->infoHashString().c_str();
ret.comment = tor->comment().c_str();
ret.creator = tor->creator().c_str();
ret.source = tor->source().c_str();
ret.total_size = tor->totalSize();
ret.date_created = tor->dateCreated();
ret.piece_size = tor->pieceSize();
ret.n_pieces = tor->pieceCount();
ret.is_private = tor->isPrivate();
ret.is_folder = tor->fileCount() > 1;
return ret;
}
std::string tr_torrentFilename(tr_torrent const* tor)
{
return std::string{ tor->torrentFile() };
}
size_t tr_torrentFilenameToBuf(tr_torrent const* tor, char* buf, size_t buflen)
{
return tr_strvToBuf(tr_torrentFilename(tor), buf, buflen);
}
/***
****
***/
tr_peer_stat* tr_torrentPeers(tr_torrent const* tor, int* peer_count)
{
TR_ASSERT(tr_isTorrent(tor));
return tr_peerMgrPeerStats(tor, peer_count);
}
void tr_torrentPeersFree(tr_peer_stat* peers, int /*peerCount*/)
{
delete[] peers;
}
void tr_torrentAvailability(tr_torrent const* tor, int8_t* tab, int size)
{
TR_ASSERT(tr_isTorrent(tor));
if (tab != nullptr && size > 0)
{
tr_peerMgrTorrentAvailability(tor, tab, size);
}
}
void tr_torrentAmountFinished(tr_torrent const* tor, float* tabs, int n_tabs)
{
return tor->amountDoneBins(tabs, n_tabs);
}
static void tr_torrentResetTransferStats(tr_torrent* tor)
{
auto const lock = tor->unique_lock();
tor->downloadedPrev += tor->downloadedCur;
tor->downloadedCur = 0;
tor->uploadedPrev += tor->uploadedCur;
tor->uploadedCur = 0;
tor->corruptPrev += tor->corruptCur;
tor->corruptCur = 0;
tor->setDirty();
}
/***
****
***/
#ifdef TR_ENABLE_ASSERTS
static bool queueIsSequenced(tr_session const* /*session*/);
#endif
static void freeTorrent(tr_torrent* tor)
{
auto const lock = tor->unique_lock();
TR_ASSERT(!tor->isRunning);
tr_session* session = tor->session;
tr_peerMgrRemoveTorrent(tor);
tr_announcerRemoveTorrent(session->announcer, tor);
session->torrents().remove(tor, tr_time());
if (!session->isClosing())
{
// "so you die, captain, and we all move up in rank."
// resequence the queue positions
for (auto* t : session->torrents())
{
if (t->queuePosition > tor->queuePosition)
{
t->queuePosition--;
t->markChanged();
}
}
TR_ASSERT(queueIsSequenced(session));
}
delete tor;
}
/**
*** Start/Stop Callback
**/
static void torrentSetQueued(tr_torrent* tor, bool queued);
static void torrentStartImpl(tr_torrent* const tor)
{
auto const lock = tor->unique_lock();
TR_ASSERT(tr_isTorrent(tor));
tor->recheckCompleteness();
torrentSetQueued(tor, false);
time_t const now = tr_time();
tor->isRunning = true;
tor->completeness = tor->completion.status();
tor->startDate = now;
tor->markChanged();
tr_torrentClearError(tor);
tor->finishedSeedingByIdle = false;
tr_torrentResetTransferStats(tor);
tr_announcerTorrentStarted(tor);
tor->dhtAnnounceAt = now + tr_rand_int_weak(20);
tor->dhtAnnounce6At = now + tr_rand_int_weak(20);
tor->lpdAnnounceAt = now;
tr_peerMgrStartTorrent(tor);
}
static bool torrentShouldQueue(tr_torrent const* const tor)
{
tr_direction const dir = tor->queueDirection();
return tor->session->countQueueFreeSlots(dir) == 0;
}
static void torrentStart(tr_torrent* tor, torrent_start_opts opts)
{
switch (tr_torrentGetActivity(tor))
{
case TR_STATUS_SEED:
case TR_STATUS_DOWNLOAD:
return; /* already started */
case TR_STATUS_SEED_WAIT:
case TR_STATUS_DOWNLOAD_WAIT:
if (!opts.bypass_queue)
{
return; /* already queued */
}
break;
case TR_STATUS_CHECK:
case TR_STATUS_CHECK_WAIT:
/* verifying right now... wait until that's done so
* we'll know what completeness to use/announce */
tor->startAfterVerify = true;
return;
case TR_STATUS_STOPPED:
if (!opts.bypass_queue && torrentShouldQueue(tor))
{
torrentSetQueued(tor, true);
return;
}
break;
}
/* don't allow the torrent to be started if the files disappeared */
if (setLocalErrorIfFilesDisappeared(tor, opts.has_local_data))
{
return;
}
/* otherwise, start it now... */
auto const lock = tor->unique_lock();
/* allow finished torrents to be resumed */
if (tr_torrentIsSeedRatioDone(tor))
{
tr_logAddInfoTor(tor, _("Restarted manually -- disabling its seed ratio"));
tr_torrentSetRatioMode(tor, TR_RATIOLIMIT_UNLIMITED);
}
/* corresponds to the peer_id sent as a tracker request parameter.
* one tracker admin says: "When the same torrent is opened and
* closed and opened again without quitting Transmission ...
* change the peerid. It would help sometimes if a stopped event
* was missed to ensure that we didn't think someone was cheating. */
tr_torrentUnsetPeerId(tor);
tor->isRunning = true;
tor->setDirty();
tr_runInEventThread(tor->session, torrentStartImpl, tor);
}
void tr_torrentStart(tr_torrent* tor)
{
if (tr_isTorrent(tor))
{
tor->startAfterVerify = true;
torrentStart(tor, {});
}
}
void tr_torrentStartNow(tr_torrent* tor)
{
if (tr_isTorrent(tor))
{
auto opts = torrent_start_opts{};
opts.bypass_queue = true;
torrentStart(tor, opts);
}
}
static void onVerifyDoneThreadFunc(tr_torrent* const tor)
{
TR_ASSERT(tr_amInEventThread(tor->session));
if (tor->isDeleting)
{
return;
}
tor->recheckCompleteness();
if (tor->startAfterVerify)
{
tor->startAfterVerify = false;
auto opts = torrent_start_opts{};
opts.has_local_data = !tor->checked_pieces_.hasNone();
torrentStart(tor, opts);
}
}
void tr_torrentOnVerifyDone(tr_torrent* tor, bool aborted)
{
if (aborted || tor->isDeleting)
{
return;
}
tr_runInEventThread(tor->session, onVerifyDoneThreadFunc, tor);
}
static void verifyTorrent(tr_torrent* const tor)
{
TR_ASSERT(tr_amInEventThread(tor->session));
auto const lock = tor->unique_lock();
if (tor->isDeleting)
{
return;
}
/* if the torrent's already being verified, stop it */
tor->session->verifyRemove(tor);
bool const start_after = (tor->isRunning || tor->startAfterVerify) && !tor->isStopping;
if (tor->isRunning)
{
tr_torrentStop(tor);
}
if (setLocalErrorIfFilesDisappeared(tor))
{
tor->startAfterVerify = false;
}
else
{
tor->startAfterVerify = start_after;
tor->session->verifyAdd(tor);
}
}
void tr_torrentVerify(tr_torrent* tor)
{
tr_runInEventThread(tor->session, verifyTorrent, tor);
}
void tr_torrentSave(tr_torrent* tor)
{
TR_ASSERT(tr_isTorrent(tor));
if (tor->isDirty)
{
tor->isDirty = false;
tr_resume::save(tor);
}
}
static void stopTorrent(tr_torrent* const tor)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tr_amInEventThread(tor->session));
auto const lock = tor->unique_lock();
if (!tor->session->isClosing())
{
tr_logAddInfoTor(tor, _("Pausing torrent"));
}
tor->session->verifyRemove(tor);
tr_peerMgrStopTorrent(tor);
tr_announcerTorrentStopped(tor);
tor->session->closeTorrentFiles(tor);
if (!tor->isDeleting)
{
tr_torrentSave(tor);
}
torrentSetQueued(tor, false);
if (tor->magnetVerify)
{
tor->magnetVerify = false;
tr_logAddTraceTor(tor, "Magnet Verify");
tor->refreshCurrentDir();
tr_torrentVerify(tor);
callScriptIfEnabled(tor, TR_SCRIPT_ON_TORRENT_ADDED);
}
}
void tr_torrentStop(tr_torrent* tor)
{
if (!tr_isTorrent(tor))
{
return;
}
auto const lock = tor->unique_lock();
tor->isRunning = false;
tor->isStopping = false;
tor->setDirty();
tr_runInEventThread(tor->session, stopTorrent, tor);
}
static void closeTorrent(tr_torrent* const tor)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tr_amInEventThread(tor->session));
if (!tor->session->isClosing())
{
tr_logAddInfoTor(tor, _("Removing torrent"));
}
tor->magnetVerify = false;
stopTorrent(tor);
if (tor->isDeleting)
{
tr_torrent_metainfo::removeFile(tor->session->torrentDir(), tor->name(), tor->infoHashString(), ".torrent"sv);
tr_torrent_metainfo::removeFile(tor->session->torrentDir(), tor->name(), tor->infoHashString(), ".magnet"sv);
tr_torrent_metainfo::removeFile(tor->session->resumeDir(), tor->name(), tor->infoHashString(), ".resume"sv);
}
tor->isRunning = false;
freeTorrent(tor);
}
void tr_torrentFree(tr_torrent* tor)
{
if (tr_isTorrent(tor))
{
tr_session* session = tor->session;
TR_ASSERT(session != nullptr);
auto const lock = tor->unique_lock();
tr_runInEventThread(session, closeTorrent, tor);
}
}
static void removeTorrentInEventThread(tr_torrent* tor, bool delete_flag, tr_fileFunc delete_func)
{
auto const lock = tor->unique_lock();
if (delete_flag && tor->hasMetainfo())
{
// ensure the files are all closed and idle before moving
tor->session->closeTorrentFiles(tor);
tor->session->verifyRemove(tor);
if (delete_func == nullptr)
{
delete_func = tr_sys_path_remove;
}
auto const delete_func_wrapper = [&delete_func](char const* filename)
{
delete_func(filename, nullptr);
};
tor->metainfo_.files().remove(tor->currentDir(), tor->name(), delete_func_wrapper);
}
closeTorrent(tor);
}
void tr_torrentRemove(tr_torrent* tor, bool delete_flag, tr_fileFunc delete_func)
{
TR_ASSERT(tr_isTorrent(tor));
tor->isDeleting = true;
tr_runInEventThread(tor->session, removeTorrentInEventThread, tor, delete_flag, delete_func);
}
/**
*** Completeness
**/
static char const* getCompletionString(int type)
{
switch (type)
{
case TR_PARTIAL_SEED:
/* Translators: this is a minor point that's safe to skip over, but FYI:
"Complete" and "Done" are specific, different terms in Transmission:
"Complete" means we've downloaded every file in the torrent.
"Done" means we're done downloading the files we wanted, but NOT all
that exist */
return "Done";
case TR_SEED:
return "Complete";
default:
return "Incomplete";
}
}
static std::string buildLabelsString(tr_torrent const* tor)
{
auto buf = std::stringstream{};
for (auto it = std::begin(tor->labels), end = std::end(tor->labels); it != end;)
{
buf << *it;
if (++it != end)
{
buf << ',';
}
}
return buf.str();
}
static std::string buildTrackersString(tr_torrent const* tor)
{
auto buf = std::stringstream{};
for (size_t i = 0, n = tr_torrentTrackerCount(tor); i < n; ++i)
{
buf << tr_torrentTracker(tor, i).host;
if (++i < n)
{
buf << ',';
}
}
return buf.str();
}
static void torrentCallScript(tr_torrent const* tor, std::string const& script)
{
if (std::empty(script))
{
return;
}
auto torrent_dir = tr_pathbuf{ tor->currentDir() };
tr_sys_path_native_separators(std::data(torrent_dir));
auto const cmd = std::array<char const*, 2>{ script.c_str(), nullptr };
auto const id_str = std::to_string(tr_torrentId(tor));
auto const labels_str = buildLabelsString(tor);
auto const trackers_str = buildTrackersString(tor);
auto const bytes_downloaded_str = std::to_string(tor->downloadedCur + tor->downloadedPrev);
auto const env = std::map<std::string_view, std::string_view>{
{ "TR_APP_VERSION"sv, SHORT_VERSION_STRING },
{ "TR_TIME_LOCALTIME"sv, fmt::format("{:%a %b %d %T %Y%n}", fmt::localtime(tr_time())) },
{ "TR_TORRENT_BYTES_DOWNLOADED"sv, bytes_downloaded_str },
{ "TR_TORRENT_DIR"sv, torrent_dir.c_str() },
{ "TR_TORRENT_HASH"sv, tor->infoHashString() },
{ "TR_TORRENT_ID"sv, id_str },
{ "TR_TORRENT_LABELS"sv, labels_str },
{ "TR_TORRENT_NAME"sv, tr_torrentName(tor) },
{ "TR_TORRENT_TRACKERS"sv, trackers_str },
};
tr_logAddInfoTor(tor, fmt::format(_("Calling script '{path}'"), fmt::arg("path", script)));
tr_error* error = nullptr;
if (!tr_spawn_async(std::data(cmd), env, TR_IF_WIN32("\\", "/"), &error))
{
tr_logAddWarnTor(
tor,
fmt::format(
_("Couldn't call script '{path}': {error} ({error_code})"),
fmt::arg("path", script),
fmt::arg("error", error->message),
fmt::arg("error_code", error->code)));
tr_error_free(error);
}
}
void tr_torrent::recheckCompleteness()
{
auto const lock = unique_lock();
auto const new_completeness = completion.status();
if (new_completeness != completeness)
{
bool const recent_change = downloadedCur != 0;
bool const was_leeching = !this->isDone();
bool const was_running = isRunning;
if (recent_change)
{
tr_logAddTraceTor(
this,
fmt::format(
"State changed from {} to {}",
getCompletionString(this->completeness),
getCompletionString(completeness)));
}
this->completeness = new_completeness;
this->session->closeTorrentFiles(this);
if (this->isDone())
{
if (recent_change)
{
tr_announcerTorrentCompleted(this);
this->markChanged();
this->doneDate = tr_time();
}
if (was_leeching && was_running)
{
/* clear interested flag on all peers */
tr_peerMgrClearInterest(this);
}
if (this->currentDir() == this->incompleteDir())
{
this->setLocation(this->downloadDir(), true, nullptr, nullptr);
}
}
this->session->onTorrentCompletenessChanged(this, completeness, was_running);
if (this->isDone() && was_leeching && was_running)
{
/* if completeness was TR_LEECH, the seed limit check
will have been skipped in bandwidthPulse */
tr_torrentCheckSeedLimit(this);
}
this->setDirty();
if (this->isDone())
{
tr_torrentSave(this);
callScriptIfEnabled(this, TR_SCRIPT_ON_TORRENT_DONE);
}
}
}
/**
*** File DND
**/
void tr_torrentSetFileDLs(tr_torrent* tor, tr_file_index_t const* files, tr_file_index_t n_files, bool wanted)
{
TR_ASSERT(tr_isTorrent(tor));
tor->setFilesWanted(files, n_files, wanted);
}
/***
****
***/
void tr_torrent::setLabels(std::vector<tr_quark> const& new_labels)
{
auto const lock = unique_lock();
this->labels.clear();
for (auto label : new_labels)
{
if (std::find(std::begin(this->labels), std::end(this->labels), label) == std::end(this->labels))
{
this->labels.push_back(label);
}
}
this->labels.shrink_to_fit();
this->setDirty();
}
/***
****
***/
void tr_torrent::setBandwidthGroup(std::string_view group_name) noexcept
{
group_name = tr_strvStrip(group_name);
auto const lock = this->unique_lock();
if (std::empty(group_name))
{
this->bandwidth_group_ = tr_interned_string{};
this->bandwidth_.setParent(&this->session->top_bandwidth_);
}
else
{
this->bandwidth_group_ = group_name;
this->bandwidth_.setParent(&this->session->getBandwidthGroup(group_name));
}
this->setDirty();
}
/***
****
***/
tr_priority_t tr_torrentGetPriority(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->bandwidth_.getPriority();
}
void tr_torrentSetPriority(tr_torrent* tor, tr_priority_t priority)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tr_isPriority(priority));
if (tor->bandwidth_.getPriority() != priority)
{
tor->bandwidth_.setPriority(priority);
tor->setDirty();
}
}
/***
****
***/
void tr_torrentSetPeerLimit(tr_torrent* tor, uint16_t max_connected_peers)
{
TR_ASSERT(tr_isTorrent(tor));
if (tor->max_connected_peers != max_connected_peers)
{
tor->max_connected_peers = max_connected_peers;
tor->setDirty();
}
}
uint16_t tr_torrentGetPeerLimit(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
return tor->max_connected_peers;
}
/***
****
***/
bool tr_torrentReqIsValid(tr_torrent const* tor, tr_piece_index_t index, uint32_t offset, uint32_t length)
{
TR_ASSERT(tr_isTorrent(tor));
int err = 0;
if (index >= tor->pieceCount())
{
err = 1;
}
else if (length < 1)
{
err = 2;
}
else if (offset + length > tor->pieceSize(index))
{
err = 3;
}
else if (length > tr_block_info::BlockSize)
{
err = 4;
}
else if (tor->pieceLoc(index, offset, length).byte > tor->totalSize())
{
err = 5;
}
if (err != 0)
{
tr_logAddTraceTor(tor, fmt::format("index {} offset {} length {} err {}", index, offset, length, err));
}
return err == 0;
}
// TODO(ckerr) migrate to fpm?
tr_block_span_t tr_torGetFileBlockSpan(tr_torrent const* tor, tr_file_index_t file)
{
auto const [begin_byte, end_byte] = tor->fpm_.byteSpan(file);
auto const begin_block = tor->byteLoc(begin_byte).block;
if (begin_byte >= end_byte) // 0-byte file
{
return { begin_block, begin_block + 1 };
}
auto const final_block = tor->byteLoc(end_byte - 1).block;
auto const end_block = final_block + 1;
return { begin_block, end_block };
}
/***
****
***/
// TODO: should be const after tr_ioTestPiece() is const
bool tr_torrent::checkPiece(tr_piece_index_t piece)
{
bool const pass = tr_ioTestPiece(this, piece);
tr_logAddTraceTor(this, fmt::format("[LAZY] tr_torrent.checkPiece tested piece {}, pass=={}", piece, pass));
return pass;
}
/***
****
***/
bool tr_torrent::setTrackerList(std::string_view text)
{
auto const lock = this->unique_lock();
auto announce_list = tr_announce_list();
if (!announce_list.parse(text))
{
return false;
}
auto const has_metadata = this->hasMetainfo();
if (has_metadata && !announce_list.save(torrentFile()))
{
return false;
}
this->metainfo_.announceList() = announce_list;
this->markEdited();
// magnet links
if (!has_metadata)
{
auto const magnet_file = magnetFile();
auto const magnet_link = this->magnet();
tr_error* save_error = nullptr;
if (!tr_saveFile(magnet_file, magnet_link, &save_error))
{
this->setLocalError(fmt::format(
_("Couldn't save '{path}': {error} ({error_code})"),
fmt::arg("path", magnet_file),
fmt::arg("error", save_error->message),
fmt::arg("error_code", save_error->code)));
tr_error_clear(&save_error);
}
}
/* if we had a tracker-related error on this torrent,
* and that tracker's been removed,
* then clear the error */
if (this->error == TR_STAT_TRACKER_WARNING || this->error == TR_STAT_TRACKER_ERROR)
{
auto const error_url = this->error_announce_url;
if (std::any_of(
std::begin(this->announceList()),
std::end(this->announceList()),
[error_url](auto const& tracker) { return tracker.announce == error_url; }))
{
tr_torrentClearError(this);
}
}
/* tell the announcer to reload this torrent's tracker list */
tr_announcerResetTorrent(this->session->announcer, this);
return true;
}
bool tr_torrentSetTrackerList(tr_torrent* tor, char const* text)
{
return text != nullptr && tor->setTrackerList(text);
}
std::string tr_torrentGetTrackerList(tr_torrent const* tor)
{
return tor->trackerList();
}
size_t tr_torrentGetTrackerListToBuf(tr_torrent const* tor, char* buf, size_t buflen)
{
return tr_strvToBuf(tr_torrentGetTrackerList(tor), buf, buflen);
}
/**
***
**/
uint64_t tr_torrentGetBytesLeftToAllocate(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
uint64_t bytes_left = 0;
for (tr_file_index_t i = 0, n = tor->fileCount(); i < n; ++i)
{
if (auto const wanted = tor->files_wanted_.fileWanted(i); !wanted)
{
continue;
}
auto const length = tor->fileSize(i);
bytes_left += length;
auto const found = tor->findFile(i);
if (found)
{
bytes_left -= found->size;
}
}
return bytes_left;
}
///
static void setLocationInEventThread(
tr_torrent* tor,
std::string const& path,
bool move_from_old_path,
double volatile* setme_progress,
int volatile* setme_state)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tr_amInEventThread(tor->session));
auto ok = bool{ true };
if (move_from_old_path)
{
if (setme_state != nullptr)
{
*setme_state = TR_LOC_MOVING;
}
// ensure the files are all closed and idle before moving
tor->session->closeTorrentFiles(tor);
tor->session->verifyRemove(tor);
tr_error* error = nullptr;
ok = tor->metainfo_.files().move(tor->currentDir(), path, setme_progress, tor->name(), &error);
if (error != nullptr)
{
tor->setLocalError(fmt::format(
_("Couldn't move '{old_path}' to '{path}': {error} ({error_code})"),
fmt::arg("old_path", tor->currentDir()),
fmt::arg("path", path),
fmt::arg("error", error->message),
fmt::arg("error_code", error->code)));
tr_torrentStop(tor);
tr_error_clear(&error);
}
}
// tell the torrent where the files are
if (ok)
{
tor->setDownloadDir(path);
if (move_from_old_path)
{
tor->incomplete_dir.clear();
tor->current_dir = tor->downloadDir();
}
}
if (setme_state != nullptr)
{
*setme_state = ok ? TR_LOC_DONE : TR_LOC_ERROR;
}
}
void tr_torrent::setLocation(
std::string_view location,
bool move_from_old_path,
double volatile* setme_progress,
int volatile* setme_state)
{
if (setme_state != nullptr)
{
*setme_state = TR_LOC_MOVING;
}
tr_runInEventThread(
this->session,
setLocationInEventThread,
this,
std::string{ location },
move_from_old_path,
setme_progress,
setme_state);
}
void tr_torrentSetLocation(
tr_torrent* tor,
char const* location,
bool move_from_old_path,
double volatile* setme_progress,
int volatile* setme_state)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(!tr_str_is_empty(location));
tor->setLocation(location, move_from_old_path, setme_progress, setme_state);
}
///
std::string_view tr_torrent::primaryMimeType() const
{
// count up how many bytes there are for each mime-type in the torrent
// NB: get_mime_type_for_filename() always returns the same ptr for a
// mime_type, so its raw pointer can be used as a key.
auto size_per_mime_type = std::unordered_map<std::string_view, size_t>{};
for (tr_file_index_t i = 0, n = this->fileCount(); i < n; ++i)
{
auto const mime_type = tr_get_mime_type_for_filename(this->fileSubpath(i));
size_per_mime_type[mime_type] += this->fileSize(i);
}
if (std::empty(size_per_mime_type))
{
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
// application/octet-stream is the default value for all other cases.
// An unknown file type should use this type.
auto constexpr Fallback = "application/octet-stream"sv;
return Fallback;
}
auto const it = std::max_element(
std::begin(size_per_mime_type),
std::end(size_per_mime_type),
[](auto const& a, auto const& b) { return a.second < b.second; });
return it->first;
}
/***
****
***/
static void tr_torrentFileCompleted(tr_torrent* tor, tr_file_index_t i)
{
/* close the file so that we can reopen in read-only mode as needed */
tor->session->closeTorrentFile(tor, i);
/* now that the file is complete and closed, we can start watching its
* mtime timestamp for changes to know if we need to reverify pieces */
tor->file_mtimes_[i] = tr_time();
/* if the torrent's current filename isn't the same as the one in the
* metadata -- for example, if it had the ".part" suffix appended to
* it until now -- then rename it to match the one in the metadata */
if (auto found = tor->findFile(i); found)
{
if (auto const& file_subpath = tor->fileSubpath(i); file_subpath != found->subpath())
{
auto const& oldpath = found->filename();
auto const newpath = tr_pathbuf{ found->base(), '/', file_subpath };
tr_error* error = nullptr;
if (!tr_sys_path_rename(oldpath, newpath, &error))
{
tr_logAddErrorTor(
tor,
fmt::format(
_("Couldn't move '{old_path}' to '{path}': {error} ({error_code})"),
fmt::arg("old_path", oldpath),
fmt::arg("path", newpath),
fmt::arg("error", error->message),
fmt::arg("error_code", error->code)));
tr_error_free(error);
}
}
}
}
static void tr_torrentPieceCompleted(tr_torrent* tor, tr_piece_index_t piece_index)
{
tr_peerMgrPieceCompleted(tor, piece_index);
// if this piece completes any file, invoke the fileCompleted func for it
auto const span = tor->fpm_.fileSpan(piece_index);
for (auto file = span.begin; file < span.end; ++file)
{
if (tor->completion.hasBlocks(tr_torGetFileBlockSpan(tor, file)))
{
tr_torrentFileCompleted(tor, file);
}
}
}
void tr_torrentGotBlock(tr_torrent* tor, tr_block_index_t block)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tr_amInEventThread(tor->session));
bool const block_is_new = !tor->hasBlock(block);
if (block_is_new)
{
tor->completion.addBlock(block);
tor->setDirty();
auto const piece = tor->blockLoc(block).piece;
if (tor->hasPiece(piece))
{
if (tor->checkPiece(piece))
{
tr_torrentPieceCompleted(tor, piece);
}
else
{
uint32_t const n = tor->pieceSize(piece);
tr_logAddDebugTor(tor, fmt::format("Piece {}, which was just downloaded, failed its checksum test", piece));
tor->corruptCur += n;
tor->downloadedCur -= std::min(tor->downloadedCur, uint64_t{ n });
tr_peerMgrGotBadPiece(tor, piece);
}
}
}
else
{
uint32_t const n = tor->blockSize(block);
tor->downloadedCur -= std::min(tor->downloadedCur, uint64_t{ n });
tr_logAddDebugTor(tor, "we have this block already...");
}
}
/***
****
***/
std::string tr_torrentFindFile(tr_torrent const* tor, tr_file_index_t file_num)
{
auto const found = tor->findFile(file_num);
return std::string{ found ? found->filename().sv() : ""sv };
}
size_t tr_torrentFindFileToBuf(tr_torrent const* tor, tr_file_index_t file_num, char* buf, size_t buflen)
{
return tr_strvToBuf(tr_torrentFindFile(tor, file_num), buf, buflen);
}
// decide whether we should be looking for files in downloadDir or incompleteDir
void tr_torrent::refreshCurrentDir()
{
auto dir = tr_interned_string{};
if (std::empty(incompleteDir()))
{
dir = downloadDir();
}
else if (!hasMetainfo()) // no files to find
{
dir = incompleteDir();
}
else
{
auto const found = findFile(0);
dir = found ? tr_interned_string{ found->base() } : incompleteDir();
}
TR_ASSERT(!std::empty(dir));
TR_ASSERT(dir == downloadDir() || dir == incompleteDir());
current_dir = dir;
}
/***
****
***/
#ifdef TR_ENABLE_ASSERTS
static bool queueIsSequenced(tr_session const* session)
{
auto torrents = session->getAllTorrents();
std::sort(
std::begin(torrents),
std::end(torrents),
[](auto const* a, auto const* b) { return a->queuePosition < b->queuePosition; });
#if 0
fprintf(stderr, "%s", "queue: ");
for (int i = 0; i < n; ++i)
{
fprintf(stderr, "%d ", tmp[i]->queuePosition);
}
fputc('\n', stderr);
#endif
/* test them */
bool is_sequenced = true;
for (int i = 0, n = std::size(torrents); is_sequenced && i < n; ++i)
{
is_sequenced = torrents[i]->queuePosition == i;
}
return is_sequenced;
}
#endif
int tr_torrentGetQueuePosition(tr_torrent const* tor)
{
return tor->queuePosition;
}
void tr_torrentSetQueuePosition(tr_torrent* tor, int queue_position)
{
int back = -1;
int const old_pos = tor->queuePosition;
if (queue_position < 0)
{
queue_position = 0;
}
tor->queuePosition = -1;
for (auto* const walk : tor->session->torrents())
{
if ((old_pos < queue_position) && (old_pos <= walk->queuePosition) && (walk->queuePosition <= queue_position))
{
walk->queuePosition--;
walk->markChanged();
}
if ((old_pos > queue_position) && (queue_position <= walk->queuePosition) && (walk->queuePosition < old_pos))
{
walk->queuePosition++;
walk->markChanged();
}
if (back < walk->queuePosition)
{
back = walk->queuePosition;
}
}
tor->queuePosition = std::min(queue_position, back + 1);
tor->markChanged();
TR_ASSERT(queueIsSequenced(tor->session));
}
struct CompareTorrentByQueuePosition
{
bool operator()(tr_torrent const* a, tr_torrent const* b) const
{
return a->queuePosition < b->queuePosition;
}
};
void tr_torrentsQueueMoveTop(tr_torrent* const* torrents_in, size_t torrent_count)
{
auto torrents = std::vector<tr_torrent*>(torrents_in, torrents_in + torrent_count);
std::sort(std::rbegin(torrents), std::rend(torrents), CompareTorrentByQueuePosition{});
for (auto* tor : torrents)
{
tr_torrentSetQueuePosition(tor, 0);
}
}
void tr_torrentsQueueMoveUp(tr_torrent* const* torrents_in, size_t torrent_count)
{
auto torrents = std::vector<tr_torrent*>(torrents_in, torrents_in + torrent_count);
std::sort(std::begin(torrents), std::end(torrents), CompareTorrentByQueuePosition{});
for (auto* tor : torrents)
{
tr_torrentSetQueuePosition(tor, tor->queuePosition - 1);
}
}
void tr_torrentsQueueMoveDown(tr_torrent* const* torrents_in, size_t torrent_count)
{
auto torrents = std::vector<tr_torrent*>(torrents_in, torrents_in + torrent_count);
std::sort(std::rbegin(torrents), std::rend(torrents), CompareTorrentByQueuePosition{});
for (auto* tor : torrents)
{
tr_torrentSetQueuePosition(tor, tor->queuePosition + 1);
}
}
void tr_torrentsQueueMoveBottom(tr_torrent* const* torrents_in, size_t torrent_count)
{
auto torrents = std::vector<tr_torrent*>(torrents_in, torrents_in + torrent_count);
std::sort(std::begin(torrents), std::end(torrents), CompareTorrentByQueuePosition{});
for (auto* tor : torrents)
{
tr_torrentSetQueuePosition(tor, INT_MAX);
}
}
static void torrentSetQueued(tr_torrent* tor, bool queued)
{
TR_ASSERT(tr_isTorrent(tor));
if (tor->isQueued() != queued)
{
tor->is_queued = queued;
tor->markChanged();
tor->setDirty();
}
}
/***
****
**** RENAME
****
***/
static bool renameArgsAreValid(std::string_view oldpath, std::string_view newname)
{
return !std::empty(oldpath) && !std::empty(newname) && newname != "."sv && newname != ".."sv &&
!tr_strvContains(newname, TR_PATH_DELIMITER);
}
static auto renameFindAffectedFiles(tr_torrent const* tor, std::string_view oldpath)
{
auto indices = std::vector<tr_file_index_t>{};
auto const oldpath_as_dir = tr_pathbuf{ oldpath, '/' };
auto const n_files = tor->fileCount();
for (tr_file_index_t i = 0; i < n_files; ++i)
{
auto const& name = tor->fileSubpath(i);
if (name == oldpath || tr_strvStartsWith(name, oldpath_as_dir))
{
indices.push_back(i);
}
}
return indices;
}
static int renamePath(tr_torrent const* tor, std::string_view oldpath, std::string_view newname)
{
int err = 0;
auto const base = tor->isDone() || std::empty(tor->incompleteDir()) ? tor->downloadDir() : tor->incompleteDir();
auto src = tr_pathbuf{ base, '/', oldpath };
if (!tr_sys_path_exists(src)) /* check for it as a partial */
{
src += tr_torrent_files::PartialFileSuffix;
}
if (tr_sys_path_exists(src))
{
auto const parent = tr_sys_path_dirname(src);
auto const tgt = tr_strvEndsWith(src, tr_torrent_files::PartialFileSuffix) ?
tr_pathbuf{ parent, '/', newname, tr_torrent_files::PartialFileSuffix } :
tr_pathbuf{ parent, '/', newname };
auto tmp = errno;
bool const tgt_exists = tr_sys_path_exists(tgt);
errno = tmp;
if (!tgt_exists)
{
tr_error* error = nullptr;
tmp = errno;
if (!tr_sys_path_rename(src, tgt, &error))
{
err = error->code;
tr_error_free(error);
}
errno = tmp;
}
}
return err;
}
static void renameTorrentFileString(
tr_torrent* tor,
std::string_view oldpath,
std::string_view newname,
tr_file_index_t file_index)
{
auto name = std::string{};
auto const subpath = std::string_view{ tor->fileSubpath(file_index) };
auto const oldpath_len = std::size(oldpath);
if (!tr_strvContains(oldpath, TR_PATH_DELIMITER))
{
if (oldpath_len >= std::size(subpath))
{
name = newname;
}
else
{
name = fmt::format(FMT_STRING("{:s}/{:s}"sv), newname, subpath.substr(oldpath_len + 1));
}
}
else
{
auto const tmp = tr_sys_path_dirname(oldpath);
if (std::empty(tmp))
{
return;
}
if (oldpath_len >= std::size(subpath))
{
name = fmt::format(FMT_STRING("{:s}/{:s}"sv), tmp, newname);
}
else
{
name = fmt::format(FMT_STRING("{:s}/{:s}/{:s}"sv), tmp, newname, subpath.substr(oldpath_len + 1));
}
}
if (subpath != name)
{
tor->setFileSubpath(file_index, name);
}
}
static void torrentRenamePath(
tr_torrent* const tor,
std::string oldpath, // NOLINT performance-unnecessary-value-param
std::string newname, // NOLINT performance-unnecessary-value-param
tr_torrent_rename_done_func callback,
void* const callback_user_data)
{
TR_ASSERT(tr_isTorrent(tor));
/***
****
***/
int error = 0;
if (!renameArgsAreValid(oldpath, newname))
{
error = EINVAL;
}
else if (auto const file_indices = renameFindAffectedFiles(tor, oldpath); std::empty(file_indices))
{
error = EINVAL;
}
else
{
error = renamePath(tor, oldpath, newname);
if (error == 0)
{
/* update tr_info.files */
for (auto const& file_index : file_indices)
{
renameTorrentFileString(tor, oldpath, newname, file_index);
}
/* update tr_info.name if user changed the toplevel */
if (std::size(file_indices) == tor->fileCount() && !tr_strvContains(oldpath, '/'))
{
tor->setName(newname);
}
tor->markEdited();
tor->setDirty();
}
}
/***
****
***/
tor->markChanged();
/* callback */
if (callback != nullptr)
{
(*callback)(tor, oldpath.c_str(), newname.c_str(), error, callback_user_data);
}
}
void tr_torrent::renamePath(
std::string_view oldpath,
std::string_view newname,
tr_torrent_rename_done_func callback,
void* callback_user_data)
{
tr_runInEventThread(
this->session,
torrentRenamePath,
this,
std::string{ oldpath },
std::string{ newname },
callback,
callback_user_data);
}
void tr_torrentRenamePath(
tr_torrent* tor,
char const* oldpath,
char const* newname,
tr_torrent_rename_done_func callback,
void* callback_user_data)
{
oldpath = oldpath != nullptr ? oldpath : "";
newname = newname != nullptr ? newname : "";
tor->renamePath(oldpath, newname, callback, callback_user_data);
}
void tr_torrentSetFilePriorities(
tr_torrent* tor,
tr_file_index_t const* files,
tr_file_index_t file_count,
tr_priority_t priority)
{
tor->setFilePriorities(files, file_count, priority);
}
bool tr_torrentHasMetadata(tr_torrent const* tor)
{
return tor->hasMetainfo();
}
void tr_torrent::markEdited()
{
this->editDate = tr_time();
}
void tr_torrent::markChanged()
{
this->anyDate = tr_time();
}
void tr_torrent::setBlocks(tr_bitfield blocks)
{
this->completion.setBlocks(std::move(blocks));
}
[[nodiscard]] bool tr_torrent::ensurePieceIsChecked(tr_piece_index_t piece)
{
TR_ASSERT(piece < this->pieceCount());
if (isPieceChecked(piece))
{
return true;
}
bool const checked = checkPiece(piece);
this->markChanged();
this->setDirty();
checked_pieces_.set(piece, checked);
return checked;
}
void tr_torrent::initCheckedPieces(tr_bitfield const& checked, time_t const* mtimes /*fileCount()*/)
{
TR_ASSERT(std::size(checked) == this->pieceCount());
checked_pieces_ = checked;
auto const n = this->fileCount();
this->file_mtimes_.resize(n);
for (size_t i = 0; i < n; ++i)
{
auto const found = this->findFile(i);
auto const mtime = found ? found->last_modified_at : 0;
this->file_mtimes_[i] = mtime;
// if a file has changed, mark its pieces as unchecked
if (mtime == 0 || mtime != mtimes[i])
{
auto const [begin, end] = piecesInFile(i);
checked_pieces_.unsetSpan(begin, end);
}
}
}
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