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David Stone
285
dependencies/amphp/amp/lib/Loop/UvDriver.php
vendored
Normal file
285
dependencies/amphp/amp/lib/Loop/UvDriver.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\Promise\rethrow;
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class UvDriver extends Driver
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{
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/** @var resource A uv_loop resource created with uv_loop_new() */
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private $handle;
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/** @var resource[] */
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private $events = [];
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/** @var Watcher[][] */
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private $watchers = [];
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/** @var resource[] */
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private $streams = [];
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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 $signalCallback;
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public function __construct()
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{
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$this->handle = \uv_loop_new();
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/**
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* @param $event
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* @param $status
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* @param $events
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* @param $resource
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*
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* @return void
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*/
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$this->ioCallback = function ($event, $status, $events, $resource) {
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$watchers = $this->watchers[(int) $event];
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switch ($status) {
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case 0:
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// OK
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break;
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default:
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// Invoke the callback on errors, as this matches behavior with other loop back-ends.
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// Re-enable watcher as libuv disables the watcher on non-zero status.
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$flags = 0;
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foreach ($watchers as $watcher) {
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$flags |= $watcher->enabled ? $watcher->type : 0;
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}
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\uv_poll_start($event, $flags, $this->ioCallback);
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break;
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}
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foreach ($watchers as $watcher) {
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// $events is OR'ed with 4 to trigger watcher if no events are indicated (0) or on UV_DISCONNECT (4).
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// http://docs.libuv.org/en/v1.x/poll.html
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if (!($watcher->enabled && ($watcher->type & $events || ($events | 4) === 4))) {
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continue;
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}
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try {
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$result = ($watcher->callback)($watcher->id, $resource, $watcher->data);
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if ($result === null) {
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continue;
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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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* @param $event
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*
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* @return void
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*/
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$this->timerCallback = function ($event) {
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$watcher = $this->watchers[(int) $event][0];
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if ($watcher->type & Watcher::DELAY) {
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unset($this->events[$watcher->id], $this->watchers[(int) $event]);
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// Avoid call to uv_is_active().
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$this->cancel($watcher->id);
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// Remove reference to watcher in parent.
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} elseif ($watcher->value === 0) {
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// Disable and re-enable so it's not executed repeatedly in the same tick
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// See https://github.com/amphp/amp/issues/131
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$this->disable($watcher->id);
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$this->enable($watcher->id);
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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 $event
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* @param $signo
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*
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* @return void
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*/
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$this->signalCallback = function ($event, $signo) {
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$watcher = $this->watchers[(int) $event][0];
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try {
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$result = ($watcher->callback)($watcher->id, $signo, $watcher->data);
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if ($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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return;
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}
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$event = $this->events[$watcherId];
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$eventId = (int) $event;
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if (isset($this->watchers[$eventId][0])) {
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// All except IO watchers.
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unset($this->watchers[$eventId]);
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} elseif (isset($this->watchers[$eventId][$watcherId])) {
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$watcher = $this->watchers[$eventId][$watcherId];
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unset($this->watchers[$eventId][$watcherId]);
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if (empty($this->watchers[$eventId])) {
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unset($this->watchers[$eventId], $this->streams[(int) $watcher->value]);
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}
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}
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unset($this->events[$watcherId]);
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}
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public static function isSupported() : bool
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{
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return \extension_loaded("uv");
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}
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/**
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* {@inheritdoc}
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*/
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public function now() : int
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{
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\uv_update_time($this->handle);
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/** @psalm-suppress TooManyArguments */
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return \uv_now($this->handle);
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}
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/**
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* {@inheritdoc}
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*/
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public function getHandle()
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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 $blocking)
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{
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/** @psalm-suppress TooManyArguments */
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\uv_run($this->handle, $blocking ? \UV::RUN_ONCE : \UV::RUN_NOWAIT);
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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 $watcher) {
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$id = $watcher->id;
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switch ($watcher->type) {
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case Watcher::READABLE:
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case Watcher::WRITABLE:
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\assert(\is_resource($watcher->value));
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$streamId = (int) $watcher->value;
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if (isset($this->streams[$streamId])) {
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$event = $this->streams[$streamId];
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} elseif (isset($this->events[$id])) {
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$event = $this->streams[$streamId] = $this->events[$id];
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} else {
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/** @psalm-suppress UndefinedFunction */
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$event = $this->streams[$streamId] = \WP_Ultimo\Dependencies\uv_poll_init_socket($this->handle, $watcher->value);
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}
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$eventId = (int) $event;
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$this->events[$id] = $event;
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$this->watchers[$eventId][$id] = $watcher;
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$flags = 0;
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foreach ($this->watchers[$eventId] as $w) {
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$flags |= $w->enabled ? $w->type : 0;
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}
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\uv_poll_start($event, $flags, $this->ioCallback);
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break;
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case Watcher::DELAY:
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case Watcher::REPEAT:
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\assert(\is_int($watcher->value));
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if (isset($this->events[$id])) {
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$event = $this->events[$id];
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} else {
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$event = $this->events[$id] = \uv_timer_init($this->handle);
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}
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$this->watchers[(int) $event] = [$watcher];
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\uv_timer_start($event, \max(0, $watcher->expiration - $now), $watcher->type & Watcher::REPEAT ? $watcher->value : 0, $this->timerCallback);
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break;
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case Watcher::SIGNAL:
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\assert(\is_int($watcher->value));
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if (isset($this->events[$id])) {
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$event = $this->events[$id];
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} else {
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/** @psalm-suppress UndefinedFunction */
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$event = $this->events[$id] = \WP_Ultimo\Dependencies\uv_signal_init($this->handle);
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}
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$this->watchers[(int) $event] = [$watcher];
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/** @psalm-suppress UndefinedFunction */
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\WP_Ultimo\Dependencies\uv_signal_start($event, $this->signalCallback, $watcher->value);
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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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}
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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 $watcher)
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{
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$id = $watcher->id;
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if (!isset($this->events[$id])) {
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return;
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}
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$event = $this->events[$id];
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if (!\uv_is_active($event)) {
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return;
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}
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switch ($watcher->type) {
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case Watcher::READABLE:
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case Watcher::WRITABLE:
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$flags = 0;
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foreach ($this->watchers[(int) $event] as $w) {
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$flags |= $w->enabled ? $w->type : 0;
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}
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if ($flags) {
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\uv_poll_start($event, $flags, $this->ioCallback);
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} else {
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\uv_poll_stop($event);
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}
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break;
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case Watcher::DELAY:
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case Watcher::REPEAT:
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\uv_timer_stop($event);
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break;
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case Watcher::SIGNAL:
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\uv_signal_stop($event);
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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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}
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