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David Stone
281
dependencies/amphp/amp/lib/Loop/EventDriver.php
vendored
Normal file
281
dependencies/amphp/amp/lib/Loop/EventDriver.php
vendored
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<?php
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namespace WP_Ultimo\Dependencies\Amp\Loop;
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use WP_Ultimo\Dependencies\Amp\Coroutine;
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use WP_Ultimo\Dependencies\Amp\Promise;
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use WP_Ultimo\Dependencies\React\Promise\PromiseInterface as ReactPromise;
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use function WP_Ultimo\Dependencies\Amp\Internal\getCurrentTime;
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use function WP_Ultimo\Dependencies\Amp\Promise\rethrow;
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class EventDriver extends Driver
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{
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/** @var \Event[]|null */
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private static $activeSignals;
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/** @var \EventBase */
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private $handle;
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/** @var \Event[] */
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private $events = [];
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/** @var callable */
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private $ioCallback;
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/** @var callable */
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private $timerCallback;
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/** @var callable */
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private $signalCallback;
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/** @var \Event[] */
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private $signals = [];
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/** @var int Internal timestamp for now. */
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private $now;
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/** @var int Loop time offset */
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private $nowOffset;
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public function __construct()
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{
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$config = new \EventConfig();
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if (\DIRECTORY_SEPARATOR !== '\\') {
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$config->requireFeatures(\EventConfig::FEATURE_FDS);
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}
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$this->handle = new \EventBase($config);
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$this->nowOffset = getCurrentTime();
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$this->now = \random_int(0, $this->nowOffset);
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$this->nowOffset -= $this->now;
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if (self::$activeSignals === null) {
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self::$activeSignals =& $this->signals;
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}
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/**
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* @param $resource
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* @param $what
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* @param Watcher $watcher
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*
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* @return void
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*/
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$this->ioCallback = function ($resource, $what, Watcher $watcher) {
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\assert(\is_resource($watcher->value));
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try {
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$result = ($watcher->callback)($watcher->id, $watcher->value, $watcher->data);
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if ($result === null) {
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return;
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}
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if ($result instanceof \Generator) {
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$result = new Coroutine($result);
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}
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if ($result instanceof Promise || $result instanceof ReactPromise) {
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rethrow($result);
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}
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} catch (\Throwable $exception) {
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$this->error($exception);
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}
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};
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/**
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* @param $resource
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* @param $what
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* @param Watcher $watcher
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*
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* @return void
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*/
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$this->timerCallback = function ($resource, $what, Watcher $watcher) {
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\assert(\is_int($watcher->value));
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if ($watcher->type & Watcher::DELAY) {
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$this->cancel($watcher->id);
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} else {
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$this->events[$watcher->id]->add($watcher->value / self::MILLISEC_PER_SEC);
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}
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try {
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$result = ($watcher->callback)($watcher->id, $watcher->data);
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if ($result === null) {
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return;
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}
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if ($result instanceof \Generator) {
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$result = new Coroutine($result);
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}
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if ($result instanceof Promise || $result instanceof ReactPromise) {
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rethrow($result);
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}
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} catch (\Throwable $exception) {
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$this->error($exception);
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}
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};
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/**
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* @param $signum
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* @param $what
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* @param Watcher $watcher
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*
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* @return void
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*/
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$this->signalCallback = function ($signum, $what, Watcher $watcher) {
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try {
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$result = ($watcher->callback)($watcher->id, $watcher->value, $watcher->data);
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if ($result === null) {
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return;
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}
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if ($result instanceof \Generator) {
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$result = new Coroutine($result);
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}
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if ($result instanceof Promise || $result instanceof ReactPromise) {
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rethrow($result);
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}
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} catch (\Throwable $exception) {
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$this->error($exception);
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}
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};
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}
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/**
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* {@inheritdoc}
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*/
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public function cancel(string $watcherId)
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{
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parent::cancel($watcherId);
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if (isset($this->events[$watcherId])) {
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$this->events[$watcherId]->free();
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unset($this->events[$watcherId]);
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}
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}
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public static function isSupported() : bool
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{
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return \extension_loaded("event");
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}
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/**
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* @codeCoverageIgnore
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*/
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public function __destruct()
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{
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// Unset here, otherwise $event->del() in the loop may fail with a warning, because __destruct order isn't defined.
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// Related https://github.com/amphp/amp/issues/159.
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$events = $this->events;
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$this->events = [];
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foreach ($events as $event) {
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if ($event !== null) {
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// Events may have been nulled in extension depending on destruct order.
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$event->free();
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}
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}
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// Manually free the loop handle to fully release loop resources.
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// See https://github.com/amphp/amp/issues/177.
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if ($this->handle !== null) {
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$this->handle->free();
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$this->handle = null;
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function run()
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{
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$active = self::$activeSignals;
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\assert($active !== null);
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foreach ($active as $event) {
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$event->del();
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}
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self::$activeSignals =& $this->signals;
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foreach ($this->signals as $event) {
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/** @psalm-suppress TooFewArguments https://github.com/JetBrains/phpstorm-stubs/pull/763 */
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$event->add();
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}
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try {
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parent::run();
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} finally {
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foreach ($this->signals as $event) {
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$event->del();
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}
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self::$activeSignals =& $active;
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foreach ($active as $event) {
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/** @psalm-suppress TooFewArguments https://github.com/JetBrains/phpstorm-stubs/pull/763 */
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$event->add();
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}
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function stop()
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{
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$this->handle->stop();
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parent::stop();
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}
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/**
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* {@inheritdoc}
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*/
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public function now() : int
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{
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$this->now = getCurrentTime() - $this->nowOffset;
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return $this->now;
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}
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/**
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* {@inheritdoc}
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*/
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public function getHandle() : \EventBase
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{
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return $this->handle;
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}
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/**
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* {@inheritdoc}
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*
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* @return void
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*/
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protected function dispatch(bool $blocking)
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{
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$this->handle->loop($blocking ? \EventBase::LOOP_ONCE : \EventBase::LOOP_ONCE | \EventBase::LOOP_NONBLOCK);
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}
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/**
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* {@inheritdoc}
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*
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* @return void
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*/
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protected function activate(array $watchers)
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{
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$now = $this->now();
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foreach ($watchers as $watcher) {
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if (!isset($this->events[$id = $watcher->id])) {
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switch ($watcher->type) {
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case Watcher::READABLE:
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\assert(\is_resource($watcher->value));
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$this->events[$id] = new \Event($this->handle, $watcher->value, \Event::READ | \Event::PERSIST, $this->ioCallback, $watcher);
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break;
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case Watcher::WRITABLE:
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\assert(\is_resource($watcher->value));
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$this->events[$id] = new \Event($this->handle, $watcher->value, \Event::WRITE | \Event::PERSIST, $this->ioCallback, $watcher);
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break;
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case Watcher::DELAY:
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case Watcher::REPEAT:
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\assert(\is_int($watcher->value));
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$this->events[$id] = new \Event($this->handle, -1, \Event::TIMEOUT, $this->timerCallback, $watcher);
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break;
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case Watcher::SIGNAL:
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\assert(\is_int($watcher->value));
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$this->events[$id] = new \Event($this->handle, $watcher->value, \Event::SIGNAL | \Event::PERSIST, $this->signalCallback, $watcher);
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break;
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default:
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// @codeCoverageIgnoreStart
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throw new \Error("Unknown watcher type");
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}
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}
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switch ($watcher->type) {
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case Watcher::DELAY:
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case Watcher::REPEAT:
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\assert(\is_int($watcher->value));
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$interval = \max(0, $watcher->expiration - $now);
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$this->events[$id]->add($interval > 0 ? $interval / self::MILLISEC_PER_SEC : 0);
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break;
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case Watcher::SIGNAL:
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$this->signals[$id] = $this->events[$id];
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// no break
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default:
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/** @psalm-suppress TooFewArguments https://github.com/JetBrains/phpstorm-stubs/pull/763 */
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$this->events[$id]->add();
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break;
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}
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}
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}
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/**
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* {@inheritdoc}
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*
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* @return void
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*/
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protected function deactivate(Watcher $watcher)
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{
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if (isset($this->events[$id = $watcher->id])) {
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$this->events[$id]->del();
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if ($watcher->type === Watcher::SIGNAL) {
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unset($this->signals[$id]);
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}
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}
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}
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}
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