/**
* @param ChainStateInterface $chain
* @param BlockIndexInterface $prevIndex
* @return int|string
*/
public function getWorkRequired(ChainStateInterface $chain, BlockIndexInterface $prevIndex)
{
$math = $this->math;
if ($math->cmp($math->mod($math->add($prevIndex->getHeight(), 1), $this->params->powRetargetInterval()), 0) !== 0) {
// No change in difficulty
return $prevIndex->getHeader()->getBits()->getInt();
}
// Re-target
$heightLastRetarget = $math->sub($prevIndex->getHeight(), $math->sub($this->params->powRetargetInterval(), 1));
$lastTime = $chain->fetchAncestor($heightLastRetarget)->getHeader()->getTimestamp();
return $this->calculateNextWorkRequired($prevIndex, $lastTime);
}
/**
* @param ChainSegment $segment
* @param BlockIndexInterface $index
*/
public function updateSegment(ChainSegment $segment, BlockIndexInterface $index)
{
$prevBits = $segment->getLast()->getHeader()->getBits();
$segment->next($index);
$this->hashStorage[$segment->getId()][$index->getHash()->getBinary()] = $index->getHeight();
$this->heightStorage[$segment->getId()][$index->getHeight()] = $index->getHash()->getBinary();
if ($index->getHeight() % $this->params->powRetargetInterval() === 0) {
$this->emit('retarget', [$segment, $prevBits, $index]);
}
$this->updateGreatestWork();
}
