/**
* @param ChainAccessInterface $chain
* @param BlockIndexInterface $prevIndex
* @return int
*/
public function getWorkRequired(ChainAccessInterface $chain, BlockIndexInterface $prevIndex)
{
$params = $this->consensus->getParams();
if (($prevIndex->getHeight() + 1) % $params->powRetargetInterval() !== 0) {
// No change in difficulty
return $prevIndex->getHeader()->getBits();
}
// Re-target
$heightLastRetarget = $prevIndex->getHeight() - ($params->powRetargetInterval() - 1);
$lastTime = $chain->fetchAncestor($heightLastRetarget)->getHeader()->getTimestamp();
return $this->consensus->calculateNextWorkRequired($prevIndex, $lastTime);
}
/**
* @return ChainSegment[]
*/
public function getHistory()
{
$height = $this->index->getHeight();
$history = [];
foreach ($this->getHistory() as $segment) {
if ($segment->getLast()->getHeight() <= $height) {
$history[] = $segment;
} else {
break;
}
}
return $history;
}
/**
*
*/
private function update()
{
$header = $this->index->getHeader();
// Check all active features
if ($header->getTimestamp() >= $this->params->p2shActivateTime()) {
$this->p2sh = true;
}
$hash = $this->index->getHash()->getBinary();
$this->bip30 = !($this->index->getHeight() == 91842 && $hash == pack("H*", "00000000000a4d0a398161ffc163c503763b1f4360639393e0e4c8e300e0caec") || $this->index->getHeight() == 91880 && $hash == pack("H*", "00000000000743f190a18c5577a3c2d2a1f610ae9601ac046a38084ccb7cd721"));
$highest = $this->majorityVersion();
if ($highest >= 2) {
$this->bip34 = true;
}
if ($highest >= 3) {
$this->derSig = true;
}
if ($highest >= 4) {
$this->cltv = true;
}
// Calculate flags
$this->flags = $this->p2sh ? InterpreterInterface::VERIFY_NONE : InterpreterInterface::VERIFY_P2SH;
if ($this->derSig) {
$this->flags |= InterpreterInterface::VERIFY_DERSIG;
}
if ($this->cltv) {
$this->flags |= InterpreterInterface::VERIFY_CHECKLOCKTIMEVERIFY;
}
}
/**
* @param BlockIndexInterface $index
* @return bool
*/
public function isNext(BlockIndexInterface $index)
{
if (false === $this->hash->equals($index->getHeader()->getPrevBlock())) {
return false;
}
if (false === ($index->getHeight() == $this->height + 1)) {
return false;
}
return true;
}
/**
* @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 BufferInterface $hash
* @param BlockIndexInterface $prevIndex
* @param BlockHeaderInterface $header
* @return BlockIndex
*/
public function getNextIndex(BufferInterface $hash, BlockIndexInterface $prevIndex, BlockHeaderInterface $header)
{
return new BlockIndex($hash, $prevIndex->getHeight() + 1, $this->math->toString($this->math->add($this->proofOfWork->getWork($header->getBits()), gmp_init($prevIndex->getWork()))), $header);
}
/**
* @param BlockIndexInterface $index
* @return array
*/
public function convertIndexToArray(BlockIndexInterface $index)
{
$header = $index->getHeader();
return ['height' => $index->getHeight(), 'hash' => $index->getHash()->getHex(), 'work' => $index->getWork(), 'version' => $header->getVersion(), 'prevBlock' => $header->getPrevBlock()->getHex(), 'merkleRoot' => $header->getMerkleRoot()->getHex(), 'nBits' => $header->getBits(), 'nTimestamp' => $header->getTimestamp(), 'nNonce' => $header->getNonce()];
}
/**
* @param BlockIndexInterface $index
* @param BlockInterface $block
* @param BlockData $blockData
*/
public function logBlock(BlockIndexInterface $index, BlockInterface $block, BlockData $blockData)
{
echo count($blockData->remainingNew) . "created and " . count($blockData->requiredOutpoints) . " destroyed\n";
$this->log('block', ['hash' => $index->getHash()->getHex(), 'height' => $index->getHeight(), 'txs' => count($block->getTransactions()), 'nFees' => gmp_strval($blockData->nFees, 10), 'nSigOps' => $blockData->nSigOps, 'utxos' => ['created' => count($blockData->remainingNew), 'removed' => count($blockData->requiredOutpoints)]]);
}
/**
* @param BlockInterface $block
* @param BlockIndexInterface $prevBlockIndex
* @return $this
*/
public function checkContextual(BlockInterface $block, BlockIndexInterface $prevBlockIndex)
{
$newHeight = $prevBlockIndex->getHeight() + 1;
$newTime = $block->getHeader()->getTimestamp();
foreach ($block->getTransactions() as $transaction) {
if (!$this->checkTransactionIsFinal($transaction, $newHeight, $newTime)) {
throw new \RuntimeException('Block contains a non-final transaction');
}
}
return $this;
}