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Merge #8275: Remove bad chain alert partition check

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ab8be98 Remove bad chain alert partition check (BtcDrak)
This commit is contained in:
Wladimir J. van der Laan
2016-07-06 07:35:39 +02:00
parent aef381161f ab8be98fdb
commit 042c323922
5 changed files with 0 additions and 150 deletions
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62
src/main.cpp
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@@ -2240,68 +2240,6 @@ void ThreadScriptCheck() {
scriptcheckqueue.Thread();
}
//
// Called periodically asynchronously; alerts if it smells like
// we're being fed a bad chain (blocks being generated much
// too slowly or too quickly).
//
void PartitionCheck(bool (*initialDownloadCheck)(), CCriticalSection& cs, const CBlockIndex *const &bestHeader,
int64_t nPowTargetSpacing)
{
if (bestHeader == NULL || initialDownloadCheck()) return;
static int64_t lastAlertTime = 0;
int64_t now = GetAdjustedTime();
if (lastAlertTime > now-60*60*24) return; // Alert at most once per day
const int SPAN_HOURS=4;
const int SPAN_SECONDS=SPAN_HOURS*60*60;
int BLOCKS_EXPECTED = SPAN_SECONDS / nPowTargetSpacing;
boost::math::poisson_distribution<double> poisson(BLOCKS_EXPECTED);
std::string strWarning;
int64_t startTime = GetAdjustedTime()-SPAN_SECONDS;
LOCK(cs);
const CBlockIndex* i = bestHeader;
int nBlocks = 0;
while (i->GetBlockTime() >= startTime) {
++nBlocks;
i = i->pprev;
if (i == NULL) return; // Ran out of chain, we must not be fully sync'ed
}
// How likely is it to find that many by chance?
double p = boost::math::pdf(poisson, nBlocks);
LogPrint("partitioncheck", "%s: Found %d blocks in the last %d hours\n", __func__, nBlocks, SPAN_HOURS);
LogPrint("partitioncheck", "%s: likelihood: %g\n", __func__, p);
// Aim for one false-positive about every fifty years of normal running:
const int FIFTY_YEARS = 50*365*24*60*60;
double alertThreshold = 1.0 / (FIFTY_YEARS / SPAN_SECONDS);
if (p <= alertThreshold && nBlocks < BLOCKS_EXPECTED)
{
// Many fewer blocks than expected: alert!
strWarning = strprintf(_("WARNING: check your network connection, %d blocks received in the last %d hours (%d expected)"),
nBlocks, SPAN_HOURS, BLOCKS_EXPECTED);
}
else if (p <= alertThreshold && nBlocks > BLOCKS_EXPECTED)
{
// Many more blocks than expected: alert!
strWarning = strprintf(_("WARNING: abnormally high number of blocks generated, %d blocks received in the last %d hours (%d expected)"),
nBlocks, SPAN_HOURS, BLOCKS_EXPECTED);
}
if (!strWarning.empty())
{
strMiscWarning = strWarning;
AlertNotify(strWarning);
lastAlertTime = now;
}
}
// Protected by cs_main
VersionBitsCache versionbitscache;