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<?php |
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namespace BitWasp\Bitcoin\Networking\Peer; |
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use BitWasp\Bitcoin\Networking\Settings\NetworkSettings; |
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use BitWasp\Bitcoin\Networking\Structure\NetworkAddressInterface; |
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use Evenement\EventEmitter; |
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use React\Promise\Deferred; |
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use React\Promise\RejectedPromise; |
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use React\Promise\Timer\TimeoutException; |
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class Manager extends EventEmitter |
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{ |
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/** |
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* @var Connector |
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*/ |
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private $connector; |
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/** |
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* @var Peer[] |
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*/ |
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private $outPeers = []; |
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/** |
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* @var Peer[] |
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*/ |
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private $inPeers = []; |
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/** |
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* @var int |
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*/ |
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private $nOutPeers = 0; |
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/** |
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* @var int |
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*/ |
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private $nInPeers = 0; |
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/** |
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* @var NetworkSettings |
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*/ |
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private $settings; |
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/** |
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* Manager constructor. |
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* @param Connector $connector |
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* @param NetworkSettings $settings |
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*/ |
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public function __construct(Connector $connector, NetworkSettings $settings) |
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{ |
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$this->connector = $connector; |
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$this->settings = $settings; |
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} |
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/** |
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* Store the newly connected peer, and trigger a new connection if they go away. |
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* |
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* @param Peer $peer |
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* @return Peer |
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*/ |
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public function registerOutboundPeer(Peer $peer) |
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{ |
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$next = $this->nOutPeers++; |
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$peer->on('close', function ($peer) use ($next) { |
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$this->emit('disconnect', [$peer]); |
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unset($this->outPeers[$next]); |
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}); |
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$this->outPeers[$next] = $peer; |
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$this->emit('outbound', [$peer]); |
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return $peer; |
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} |
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/** |
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* @param Peer $peer |
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*/ |
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public function registerInboundPeer(Peer $peer) |
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{ |
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$next = $this->nInPeers++; |
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$this->inPeers[$next] = $peer; |
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$peer->on('close', function () use ($next) { |
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unset($this->inPeers[$next]); |
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}); |
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$this->emit('inbound', [$peer]); |
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} |
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/** |
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* @param Listener $listener |
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* @return $this |
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*/ |
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public function registerListener(Listener $listener) |
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{ |
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$listener->on('connection', function (Peer $peer) { |
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$this->registerInboundPeer($peer); |
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}); |
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return $this; |
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} |
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/** |
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* @param NetworkAddressInterface $address |
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* @return \React\Promise\PromiseInterface |
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* @throws \Exception |
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*/ |
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public function connect(NetworkAddressInterface $address) |
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{ |
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return $this->connector->connect($address); |
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} |
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/** |
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* @param Locator $locator |
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* @return \React\Promise\Promise|\React\Promise\PromiseInterface |
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*/ |
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public function getAnotherPeer(Locator $locator) |
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{ |
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$deferred = new Deferred(); |
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// Otherwise, rely on the Locator. |
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try { |
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$deferred->resolve($locator->popAddress()); |
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} catch (\Exception $e) { |
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$locator->queryDnsSeeds()->then( |
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function () use ($deferred, $locator) { |
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$deferred->resolve($locator->popAddress()); |
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}, |
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function ($error) use ($deferred) { |
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return new RejectedPromise($error); |
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} |
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); |
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} |
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return $deferred->promise(); |
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} |
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/** |
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* @param Locator $locator |
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* @return \React\Promise\Promise|\React\Promise\PromiseInterface |
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*/ |
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public function attemptNextPeer(Locator $locator) |
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{ |
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$attempt = new Deferred(); |
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$this |
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->getAnotherPeer($locator) |
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->then(function (NetworkAddressInterface $address) use ($attempt, $locator) { |
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return $this->connect($address)->then( |
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function (Peer $peer) use ($attempt) { |
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$this->registerOutboundPeer($peer); |
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$attempt->resolve($peer); |
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return $peer; |
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}, |
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function (\Exception $error) use ($attempt) { |
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$attempt->reject($error); |
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} |
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); |
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}, function ($error) use ($attempt) { |
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$attempt->reject($error); |
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}); |
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return $attempt->promise(); |
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} |
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/** |
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* @param Locator $locator |
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* @param int $retries |
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* @return \React\Promise\PromiseInterface |
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*/ |
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public function connectNextPeer(Locator $locator, $retries = null) |
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{ |
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if ($retries === null) { |
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$retries = $this->settings->getMaxConnectRetries(); |
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} |
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if (!(is_integer($retries) && $retries >= 0)) { |
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throw new \InvalidArgumentException("Invalid retry count, must be an integer greater than zero"); |
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} |
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$errorBack = function ($error) use ($locator, $retries) { |
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$allowContinue = false; |
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if ($error instanceof \RuntimeException && $error->getMessage() === "Connection refused") { |
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$allowContinue = true; |
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} |
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if ($error instanceof TimeoutException) { |
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$allowContinue = true; |
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} |
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if (!$allowContinue) { |
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throw $error; |
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} |
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if (0 >= $retries) { |
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throw new \RuntimeException("Connection to peers failed: too many attempts"); |
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} |
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return $this->connectNextPeer($locator, $retries - 1); |
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}; |
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return $this |
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->attemptNextPeer($locator) |
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->then(null, $errorBack); |
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} |
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/** |
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* @param Locator $locator |
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* @param int $n |
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* @return \React\Promise\Promise |
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*/ |
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public function connectToPeers(Locator $locator, $n) |
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{ |
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$peers = []; |
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for ($i = 0; $i < $n; $i++) { |
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$peers[$i] = $this->connectNextPeer($locator); |
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} |
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return \React\Promise\all($peers); |
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} |
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} |
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Bit-Wasp /
bitcoin-p2p-php
