/**
* @param Consensus $consensus
* @param EcAdapterInterface $ecAdapter
* @param ScriptCheckInterface $scriptCheck
*/
public function __construct(Consensus $consensus, EcAdapterInterface $ecAdapter, ScriptCheckInterface $scriptCheck)
{
$this->consensus = $consensus;
$this->math = $ecAdapter->getMath();
$this->scriptCheck = $scriptCheck;
$this->params = $consensus->getParams();
}
/**
* @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);
}
/**
* @param UtxoView $view
* @param TransactionInterface $tx
* @param int $spendHeight
* @return $this
*/
public function checkContextualInputs(UtxoView $view, TransactionInterface $tx, $spendHeight)
{
$valueIn = gmp_init(0);
for ($i = 0, $nInputs = count($tx->getInputs()); $i < $nInputs; $i++) {
/*if ($out->isCoinbase()) {
// todo: cb / height
if ($spendHeight - $out->getHeight() < $this->params->coinbaseMaturityAge()) {
return false;
}
}*/
$value = gmp_init($view->fetchByInput($tx->getInput($i))->getOutput()->getValue(), 10);
$valueIn = $this->math->add($valueIn, $value);
$this->consensus->checkAmount($valueIn);
}
$valueOut = gmp_init(0);
foreach ($tx->getOutputs() as $output) {
$valueOut = $this->math->add($valueOut, gmp_init($output->getValue(), 10));
$this->consensus->checkAmount($valueOut);
}
if ($this->math->cmp($valueIn, $valueOut) < 0) {
throw new \RuntimeException('Value-in is less than value-out');
}
$fee = $this->math->sub($valueIn, $valueOut);
$this->consensus->checkAmount($fee);
return $this;
}
/**
* @param ChainState $state
* @param BlockInterface $block
* @param Headers $headers
* @param UtxoIdx $utxoIdx
* @return BlockIndex
*/
public function accept(ChainState $state, BlockInterface $block, Headers $headers, UtxoIdx $utxoIdx)
{
$bestBlock = $state->getLastBlock();
if ($bestBlock->getHash() !== $block->getHeader()->getPrevBlock()) {
throw new \RuntimeException('Blocks:accept() Block does not extend this chain!');
}
$index = $headers->accept($state, $block->getHeader());
$this->blockCheck->check($block)->checkContextual($block, $bestBlock);
//$view = $utxoIdx->fetchView($state, $block);
$view = $this->db->fetchUtxoView($block);
$flagP2sh = $this->consensus->scriptVerifyPayToScriptHash($bestBlock->getHeader()->getTimestamp());
$flags = new Flags($flagP2sh ? InterpreterInterface::VERIFY_P2SH : InterpreterInterface::VERIFY_NONE);
$nInputs = 0;
$nFees = 0;
$nSigOps = 0;
$txs = $block->getTransactions();
foreach ($block->getTransactions() as $tx) {
$nInputs += count($tx->getInputs());
$nSigOps += $this->blockCheck->getLegacySigOps($tx);
if ($nSigOps > $this->consensus->getParams()->getMaxBlockSigOps()) {
throw new \RuntimeException('Blocks::accept() - too many sigops');
}
if (!$tx->isCoinbase()) {
if ($flagP2sh) {
$nSigOps = $this->blockCheck->getP2shSigOps($view, $tx);
if ($nSigOps > $this->consensus->getParams()->getMaxBlockSigOps()) {
throw new \RuntimeException('Blocks::accept() - too many sigops');
}
}
$fee = $this->math->sub($view->getValueIn($this->math, $tx), $tx->getValueOut());
$nFees = $this->math->add($nFees, $fee);
$this->blockCheck->checkInputs($view, $tx, $index->getHeight(), $flags);
}
}
$this->blockCheck->checkCoinbaseSubsidy($txs[0], $nFees, $index->getHeight());
$this->db->insertBlock($block);
$state->updateLastBlock($index);
return $index;
}
/**
* @param BlockHeaderInterface[] $headers
* @return HeadersBatch
*/
public function prepareBatch(array $headers)
{
$countHeaders = count($headers);
if (0 === $countHeaders) {
return new HeadersBatch($this->chains->best($this->math), []);
}
$bestPrev = null;
$firstUnknown = null;
$hashStorage = new HashStorage();
foreach ($headers as $i => &$head) {
if ($this->chains->isKnownHeader($head->getPrevBlock())) {
$bestPrev = $head->getPrevBlock();
}
$hash = Hash::sha256d($head->getBuffer())->flip();
$hashStorage->attach($head, $hash);
if ($firstUnknown === null && !$this->chains->isKnownHeader($hash)) {
$firstUnknown = $i;
}
}
if (!$bestPrev instanceof BufferInterface) {
throw new \RuntimeException('Headers::accept(): Unknown start header');
}
$view = $this->chains->isTip($bestPrev);
if ($view === false) {
throw new \RuntimeException('Headers::accept(): Unhandled fork');
}
$prevIndex = $view->getIndex();
$access = $this->chains->access($view);
$batch = [];
if ($firstUnknown !== null) {
$versionInfo = $this->db->findSuperMajorityInfoByView($view);
$forks = new Forks($this->consensus->getParams(), $prevIndex, $versionInfo);
for ($i = $firstUnknown; $i < $countHeaders; $i++) {
/**
* @var BufferInterface $hash
* @var BlockHeaderInterface $header
*/
$header = $headers[$i];
$hash = $hashStorage[$header];
$this->headerCheck->check($hash, $header);
$index = $this->getNextIndex($hash, $prevIndex, $header);
$forks->next($index);
$this->headerCheck->checkContextual($access, $index, $prevIndex, $forks);
$batch[] = $index;
$prevIndex = $index;
}
}
return new HeadersBatch($view, $batch);
}
/**
* @param BlockInterface $block
* @param BlockData $blockData
* @param bool $checkSignatures
* @param bool $flags
* @param $height
*/
public function checkBlockData(BlockInterface $block, BlockData $blockData, $checkSignatures, $flags, $height)
{
$validation = new ScriptValidation($checkSignatures, $flags);
foreach ($block->getTransactions() as $tx) {
$blockData->nSigOps += $this->blockCheck->getLegacySigOps($tx);
if ($blockData->nSigOps > $this->consensus->getParams()->getMaxBlockSigOps()) {
throw new \RuntimeException('Blocks::accept() - too many sigops');
}
if (!$tx->isCoinbase()) {
if ($flags & InterpreterInterface::VERIFY_P2SH) {
$blockData->nSigOps += $this->blockCheck->getP2shSigOps($blockData->utxoView, $tx);
if ($blockData->nSigOps > $this->consensus->getParams()->getMaxBlockSigOps()) {
throw new \RuntimeException('Blocks::accept() - too many sigops');
}
}
$blockData->nFees = $this->math->add($blockData->nFees, $blockData->utxoView->getFeePaid($this->math, $tx));
$this->blockCheck->checkInputs($blockData->utxoView, $tx, $height, $flags, $validation);
}
}
if ($validation->active() && !$validation->result()) {
throw new \RuntimeException('ScriptValidation failed!');
}
$this->blockCheck->checkCoinbaseSubsidy($block->getTransaction(0), $blockData->nFees, $height);
}
