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transmission/libtransmission/verify.cc

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/*
* This file Copyright (C) 2007-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#include <algorithm>
#include <cstdlib> /* free() */
#include <cstring> /* memcmp() */
#include <set>
#include "transmission.h"
#include "completion.h"
#include "crypto-utils.h"
#include "file.h"
#include "log.h"
#include "platform.h" /* tr_lock() */
#include "torrent.h"
#include "tr-assert.h"
#include "utils.h" /* tr_malloc(), tr_free() */
#include "verify.h"
/***
****
***/
static auto constexpr MsecToSleepPerSecondDuringVerify = int{ 100 };
static bool verifyTorrent(tr_torrent* tor, bool* stopFlag)
{
tr_sys_file_t fd = TR_BAD_SYS_FILE;
uint64_t filePos = 0;
bool changed = false;
bool hadPiece = false;
time_t lastSleptAt = 0;
uint32_t piecePos = 0;
tr_file_index_t fileIndex = 0;
tr_file_index_t prevFileIndex = !fileIndex;
tr_piece_index_t pieceIndex = 0;
time_t const begin = tr_time();
size_t const buflen = 1024 * 128; // 128 KiB buffer
auto* const buffer = static_cast<uint8_t*>(tr_malloc(buflen));
tr_sha1_ctx_t sha = tr_sha1_init();
tr_logAddTorDbg(tor, "%s", "verifying torrent...");
tr_torrentSetChecked(tor, 0);
while (!*stopFlag && pieceIndex < tor->info.pieceCount)
{
tr_file const* file = &tor->info.files[fileIndex];
/* if we're starting a new piece... */
if (piecePos == 0)
{
hadPiece = tr_torrentPieceIsComplete(tor, pieceIndex);
}
/* if we're starting a new file... */
if (filePos == 0 && fd == TR_BAD_SYS_FILE && fileIndex != prevFileIndex)
{
char* filename = tr_torrentFindFile(tor, fileIndex);
fd = filename == nullptr ? TR_BAD_SYS_FILE :
tr_sys_file_open(filename, TR_SYS_FILE_READ | TR_SYS_FILE_SEQUENTIAL, 0, nullptr);
tr_free(filename);
prevFileIndex = fileIndex;
}
/* figure out how much we can read this pass */
uint64_t leftInPiece = tr_torPieceCountBytes(tor, pieceIndex) - piecePos;
uint64_t leftInFile = file->length - filePos;
uint64_t bytesThisPass = std::min(leftInFile, leftInPiece);
bytesThisPass = std::min(bytesThisPass, uint64_t{ buflen });
/* read a bit */
if (fd != TR_BAD_SYS_FILE)
{
auto numRead = uint64_t{};
if (tr_sys_file_read_at(fd, buffer, bytesThisPass, filePos, &numRead, nullptr) && numRead > 0)
{
bytesThisPass = numRead;
tr_sha1_update(sha, buffer, bytesThisPass);
tr_sys_file_advise(fd, filePos, bytesThisPass, TR_SYS_FILE_ADVICE_DONT_NEED, nullptr);
}
}
/* move our offsets */
leftInPiece -= bytesThisPass;
leftInFile -= bytesThisPass;
piecePos += bytesThisPass;
filePos += bytesThisPass;
/* if we're finishing a piece... */
if (leftInPiece == 0)
{
uint8_t hash[SHA_DIGEST_LENGTH];
tr_sha1_final(sha, hash);
bool const hasPiece = memcmp(hash, tor->info.pieces[pieceIndex].hash, SHA_DIGEST_LENGTH) == 0;
if (hasPiece || hadPiece)
{
tr_torrentSetHasPiece(tor, pieceIndex, hasPiece);
changed |= hasPiece != hadPiece;
}
tr_torrentSetPieceChecked(tor, pieceIndex);
time_t const now = tr_time();
tor->anyDate = now;
/* sleeping even just a few msec per second goes a long
* way towards reducing IO load... */
if (lastSleptAt != now)
{
lastSleptAt = now;
tr_wait_msec(MsecToSleepPerSecondDuringVerify);
}
sha = tr_sha1_init();
pieceIndex++;
piecePos = 0;
}
/* if we're finishing a file... */
if (leftInFile == 0)
{
if (fd != TR_BAD_SYS_FILE)
{
tr_sys_file_close(fd, nullptr);
fd = TR_BAD_SYS_FILE;
}
fileIndex++;
filePos = 0;
}
}
/* cleanup */
if (fd != TR_BAD_SYS_FILE)
{
tr_sys_file_close(fd, nullptr);
}
tr_sha1_final(sha, nullptr);
free(buffer);
/* stopwatch */
time_t const end = tr_time();
tr_logAddTorDbg(
tor,
"Verification is done. It took %d seconds to verify %" PRIu64 " bytes (%" PRIu64 " bytes per second)",
(int)(end - begin),
tor->info.totalSize,
(uint64_t)(tor->info.totalSize / (1 + (end - begin))));
return changed;
}
/***
****
***/
struct verify_node
{
tr_torrent* torrent;
tr_verify_done_func callback_func;
void* callback_data;
uint64_t current_size;
int compare(verify_node const& that) const
{
// higher priority comes before lower priority
auto const pa = tr_torrentGetPriority(torrent);
auto const pb = tr_torrentGetPriority(that.torrent);
if (pa != pb)
{
return pa > pb ? -1 : 1;
}
// smaller torrents come before larger ones because they verify faster
if (current_size != that.current_size)
{
return current_size < that.current_size ? -1 : 1;
}
return 0;
}
bool operator<(verify_node const& that) const
{
return compare(that) < 0;
}
};
static struct verify_node currentNode;
// TODO: refactor s.t. this doesn't leak
static auto& verifyList{ *new std::set<verify_node>{} };
static tr_thread* verifyThread = nullptr;
static bool stopCurrent = false;
static tr_lock* getVerifyLock(void)
{
static tr_lock* lock = nullptr;
if (lock == nullptr)
{
lock = tr_lockNew();
}
return lock;
}
static void verifyThreadFunc(void* /*user_data*/)
{
for (;;)
{
bool changed = false;
tr_lockLock(getVerifyLock());
stopCurrent = false;
if (std::empty(verifyList))
{
currentNode.torrent = nullptr;
break; // FIXME: unbalanced lock?
}
auto const it = std::begin(verifyList);
currentNode = *it;
verifyList.erase(it);
tr_lockUnlock(getVerifyLock());
tr_torrent* tor = currentNode.torrent;
tr_logAddTorInfo(tor, "%s", _("Verifying torrent"));
tr_torrentSetVerifyState(tor, TR_VERIFY_NOW);
changed = verifyTorrent(tor, &stopCurrent);
tr_torrentSetVerifyState(tor, TR_VERIFY_NONE);
TR_ASSERT(tr_isTorrent(tor));
if (!stopCurrent && changed)
{
tr_torrentSetDirty(tor);
}
if (currentNode.callback_func != nullptr)
{
(*currentNode.callback_func)(tor, stopCurrent, currentNode.callback_data);
}
}
verifyThread = nullptr;
tr_lockUnlock(getVerifyLock());
}
void tr_verifyAdd(tr_torrent* tor, tr_verify_done_func callback_func, void* callback_data)
{
TR_ASSERT(tr_isTorrent(tor));
tr_logAddTorInfo(tor, "%s", _("Queued for verification"));
auto node = verify_node{};
node.torrent = tor;
node.callback_func = callback_func;
node.callback_data = callback_data;
node.current_size = tr_torrentGetCurrentSizeOnDisk(tor);
tr_lockLock(getVerifyLock());
tr_torrentSetVerifyState(tor, TR_VERIFY_WAIT);
verifyList.insert(node);
if (verifyThread == nullptr)
{
verifyThread = tr_threadNew(verifyThreadFunc, nullptr);
}
tr_lockUnlock(getVerifyLock());
}
void tr_verifyRemove(tr_torrent* tor)
{
TR_ASSERT(tr_isTorrent(tor));
tr_lock* lock = getVerifyLock();
tr_lockLock(lock);
if (tor == currentNode.torrent)
{
stopCurrent = true;
while (stopCurrent)
{
tr_lockUnlock(lock);
tr_wait_msec(100);
tr_lockLock(lock);
}
}
else
{
auto const it = std::find_if(
std::begin(verifyList),
std::end(verifyList),
[tor](auto const& task) { return tor == task.torrent; });
tr_torrentSetVerifyState(tor, TR_VERIFY_NONE);
if (it != std::end(verifyList))
{
if (it->callback_func != nullptr)
{
(*it->callback_func)(tor, true, it->callback_data);
}
verifyList.erase(it);
}
}
tr_lockUnlock(lock);
}
void tr_verifyClose(tr_session* /*session*/)
{
tr_lockLock(getVerifyLock());
stopCurrent = true;
verifyList.clear();
tr_lockUnlock(getVerifyLock());
}
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