mirror of
https://github.com/danog/amp.git
synced 2024-12-14 18:37:30 +01:00
647 lines
23 KiB
PHP
647 lines
23 KiB
PHP
<?php
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namespace Amp;
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class NativeReactor implements Reactor {
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use Struct;
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private $watchers = [];
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private $immediates = [];
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private $timerOrder = [];
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private $readStreams = [];
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private $writeStreams = [];
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private $readWatchers = [];
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private $writeWatchers = [];
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private $timersEnabled = false;
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private $isTimerSortNeeded = false;
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private $state = self::STOPPED;
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private $onCoroutineResolution;
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private $hasExtPcntl;
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private $signalState;
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private $signalHandler;
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private $keepAliveCount = 0;
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public function __construct() {
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$this->hasExtPcntl = \extension_loaded("pcntl");
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$this->signalState = $signalState = new \StdClass;
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$this->signalState->shouldDispatch = false;
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$this->signalState->handlers = [];
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$this->signalHandler = static function($signo) use ($signalState) {
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if (empty($signalState->handlers[$signo])) {
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return;
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}
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foreach ($signalState->handlers[$signo] as $watcherId => $watcher) {
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$out = \call_user_func($watcher->callback, $watcherId, $signo, $watcher->cbData);
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if ($out instanceof \Generator) {
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resolve($out)->when($this->onCoroutineResolution);
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}
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}
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};
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$this->onCoroutineResolution = static function ($error = null, $result = null) {
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if ($error) {
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throw $error;
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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 run(callable $onStart = null) {
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if ($this->state !== self::STOPPED) {
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throw new \LogicException(
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"Cannot run() recursively; event reactor already active"
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);
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}
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if ($onStart) {
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$this->state = self::STARTING;
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$watcherId = $this->immediately($onStart);
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if (!$this->tryImmediate($this->watchers[$watcherId]) || empty($this->keepAliveCount)) {
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$this->unload();
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return;
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}
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} else {
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$this->state = self::RUNNING;
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}
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$this->enableTimers();
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while ($this->state > self::STOPPED) {
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$this->doTick($noWait = false);
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if (empty($this->keepAliveCount)) {
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break;
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}
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}
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$this->unload();
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}
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private function unload() {
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if ($this->watchers) {
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foreach (array_keys($this->watchers) as $watcherId) {
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$this->cancel($watcherId);
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}
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}
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$this->timersEnabled = false;
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$this->state = self::STOPPED;
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}
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private function tryImmediate($watcher) {
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try {
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unset($this->immediates[$watcher->id]);
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$this->keepAliveCount -= $watcher->keepAlive;
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$out = \call_user_func($watcher->callback, $watcher->id, $watcher->cbData);
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if ($out instanceof \Generator) {
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resolve($out)->when($this->onCoroutineResolution);
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}
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} catch (\Throwable $e) {
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// @TODO Remove coverage ignore block once PHP5 support is no longer required
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// @codeCoverageIgnoreStart
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\call_user_func($this->onCoroutineResolution, $e);
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// @codeCoverageIgnoreEnd
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} catch (\Exception $e) {
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// @TODO Remove this catch block once PHP5 support is no longer required
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\call_user_func($this->onCoroutineResolution, $e);
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}
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return $this->state;
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}
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private function enableTimers() {
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$now = microtime(true);
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foreach ($this->watchers as $watcherId => $watcher) {
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if (!($watcher->type & Watcher::TIMER) || isset($watcher->nextExecutionAt) || !$watcher->isEnabled) {
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continue;
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}
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$watcher->nextExecutionAt = $now + $watcher->msDelay;
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$this->timerOrder[$watcherId] = $watcher->nextExecutionAt;
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}
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$this->timersEnabled = true;
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$this->isTimerSortNeeded = true;
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}
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/**
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* {@inheritDoc}
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*/
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public function stop() {
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if ($this->state !== self::STOPPED) {
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$this->state = self::STOPPED;
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$this->timersEnabled = false;
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} else {
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throw new \LogicException(
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"Cannot stop(); event reactor not currently active"
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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 tick($noWait = false) {
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if ($this->state) {
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throw new \LogicException(
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"Cannot tick() recursively; event reactor already active"
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);
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}
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try {
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$this->state = self::TICKING;
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$this->doTick((bool) $noWait);
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$this->state = self::STOPPED;
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} catch (\Throwable $e) {
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$this->unload();
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throw $e;
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} catch (\Exception $e) {
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$this->unload();
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throw $e;
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}
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}
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private function doTick($noWait) {
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if (empty($this->timersEnabled)) {
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$this->enableTimers();
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}
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$immediates = $this->immediates;
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foreach ($immediates as $watcher) {
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if (!$this->tryImmediate($watcher)) {
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break;
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}
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}
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if ($this->signalState->shouldDispatch) {
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\pcntl_signal_dispatch();
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}
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// If an immediately watcher called stop() we pull out here
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if ($this->state <= self::STOPPING) {
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return;
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}
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if ($this->immediates || $noWait) {
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$timeToNextAlarm = 0;
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} elseif (empty($this->timerOrder)) {
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$timeToNextAlarm = 1;
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} else {
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if ($this->isTimerSortNeeded) {
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\asort($this->timerOrder);
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$this->isTimerSortNeeded = false;
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}
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// Don't block the run() loop if no keep-alive timers exist
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// @TODO Instead of iterating all timers hunting for a keep-alive
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// we should just use a specific counter to cache the number
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// of keep-alive timers in use at any given time
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$timeToNextAlarm = 0;
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foreach ($this->timerOrder as $watcherId => $time) {
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if ($this->watchers[$watcherId]->keepAlive) {
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// The reset() is important because the foreach modifies
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// the internal array pointer.
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$nextTimerAt = \reset($this->timerOrder);
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$timeToNextAlarm = \round($nextTimerAt - \microtime(true), 4);
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$timeToNextAlarm = ($timeToNextAlarm > 0) ? $timeToNextAlarm : 0;
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break;
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}
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}
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}
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if (empty($this->keepAliveCount)) {
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return;
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} elseif ($this->readStreams || $this->writeStreams) {
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$this->selectActionableStreams($timeToNextAlarm);
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} elseif (!($this->timerOrder || $this->immediates || $this->signalState->handlers)) {
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$this->stop();
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} elseif ($timeToNextAlarm > 0) {
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\usleep($timeToNextAlarm * 1000000);
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}
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if ($this->timerOrder || $this->immediates) {
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$this->executeTimers();
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}
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}
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private function selectActionableStreams($timeout) {
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$r = $this->readStreams;
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$w = $this->writeStreams;
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$e = null;
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if ($timeout <= 0) {
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$sec = 0;
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$usec = 0;
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} else {
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$sec = floor($timeout);
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$usec = ($timeout - $sec) * 1000000;
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}
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if (!@stream_select($r, $w, $e, $sec, $usec)) {
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return;
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}
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foreach ($r as $stream) {
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$streamId = (int) $stream;
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foreach ($this->readWatchers[$streamId] as $watcherId => $watcher) {
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$this->doIoCallback($watcherId, $watcher, $stream);
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}
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}
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foreach ($w as $stream) {
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$streamId = (int) $stream;
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foreach ($this->writeWatchers[$streamId] as $watcherId => $watcher) {
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$this->doIoCallback($watcherId, $watcher, $stream);
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}
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}
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}
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private function doIoCallback($watcherId, $watcher, $stream) {
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try {
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$result = \call_user_func($watcher->callback, $watcherId, $stream, $watcher->cbData);
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if ($result instanceof \Generator) {
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resolve($result)->when($this->onCoroutineResolution);
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}
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} catch (\Throwable $e) {
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\call_user_func($this->onCoroutineResolution, $e);
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} catch (\Exception $e) {
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\call_user_func($this->onCoroutineResolution, $e);
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}
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}
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private function executeTimers() {
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$now = microtime(true);
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if ($this->isTimerSortNeeded) {
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\asort($this->timerOrder);
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$this->isTimerSortNeeded = false;
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}
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foreach ($this->timerOrder as $watcherId => $executionCutoff) {
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if ($executionCutoff > $now) {
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break;
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}
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if (!isset($this->watchers[$watcherId])) {
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unset($this->timerOrder[$watcherId]);
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continue;
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}
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$watcher = $this->watchers[$watcherId];
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$result = \call_user_func($watcher->callback, $watcherId, $watcher->cbData);
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if ($result instanceof \Generator) {
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resolve($result)->when($this->onCoroutineResolution);
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}
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if ($watcher->type === Watcher::TIMER_ONCE) {
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$this->keepAliveCount -= $watcher->keepAlive;
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unset(
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$this->watchers[$watcherId],
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$this->timerOrder[$watcherId]
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);
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continue;
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} elseif ($watcher->isEnabled) {
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$this->isTimerSortNeeded = true;
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$watcher->nextExecutionAt = $now + $watcher->msInterval;
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$this->timerOrder[$watcherId] = $watcher->nextExecutionAt;
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} else {
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unset($this->timerOrder[$watcherId]);
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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 immediately(callable $callback, array $options = []) {
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$watcher = new \StdClass;
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$watcher->id = $watcherId = \spl_object_hash($watcher);
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$watcher->type = Watcher::IMMEDIATE;
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$watcher->callback = $callback;
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$watcher->cbData = @$options["cb_data"];
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$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
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$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
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if ($watcher->isEnabled) {
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$this->watchers[$watcherId] = $this->immediates[$watcherId] = $watcher;
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$this->keepAliveCount += $watcher->keepAlive;
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}
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return $watcherId;
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}
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/**
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* {@inheritDoc}
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*/
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public function once(callable $callback, $msDelay, array $options = []) {
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$msDelay = (int) $msDelay;
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assert(($msDelay >= 0), "\$msDelay at Argument 2 expects integer >= 0");
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/* In the php7 branch we use an anonymous class with Struct for this.
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* Using a stdclass isn't terribly readable and it's prone to error but
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* it's the easiest way to minimize the distance between 5.x and 7 code
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* and keep maintenance simple.
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*/
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$watcher = new \StdClass;
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$watcher->id = $watcherId = \spl_object_hash($watcher);
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$watcher->type = Watcher::TIMER_ONCE;
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$watcher->callback = $callback;
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$watcher->cbData = @$options["cb_data"];
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$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
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$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
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$watcher->msDelay = round(($msDelay / 1000), 3);
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$watcher->nextExecutionAt = null;
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$this->keepAliveCount += ($watcher->keepAlive && $watcher->isEnabled);
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if ($watcher->isEnabled && $this->state > self::STOPPED) {
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$nextExecutionAt = microtime(true) + $watcher->msDelay;
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$watcher->nextExecutionAt = $nextExecutionAt;
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$this->timerOrder[$watcherId] = $nextExecutionAt;
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$this->isTimerSortNeeded = true;
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}
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$this->watchers[$watcherId] = $watcher;
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return $watcherId;
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}
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/**
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* {@inheritDoc}
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*/
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public function repeat(callable $callback, $msInterval, array $options = []) {
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$msInterval = (int) $msInterval;
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assert(($msInterval >= 0), "\$msInterval at Argument 2 expects integer >= 0");
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$msDelay = isset($options["ms_delay"]) ? $options["ms_delay"] : (int) $msInterval;
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assert(($msDelay >= 0), "ms_delay option expects integer >= 0");
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/* In the php7 branch we use an anonymous class with Struct for this.
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* Using a stdclass isn't terribly readable and it's prone to error but
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* it's the easiest way to minimize the distance between 5.x and 7 code
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* and keep maintenance simple.
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*/
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$watcher = new \StdClass;
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$watcher->id = $watcherId = \spl_object_hash($watcher);
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$watcher->type = Watcher::TIMER_REPEAT;
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$watcher->callback = $callback;
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$watcher->cbData = @$options["cb_data"];
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$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
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$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
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$watcher->msInterval = round(($msInterval / 1000), 3);
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$watcher->msDelay = round(($msDelay / 1000), 3);
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$watcher->nextExecutionAt = null; // only needed for php5.x
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$this->keepAliveCount += ($watcher->keepAlive && $watcher->isEnabled);
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if ($watcher->isEnabled && $this->state > self::STOPPED) {
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$increment = (isset($watcher->msDelay) ? $watcher->msDelay : $watcher->msInterval);
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$nextExecutionAt = microtime(true) + $increment;
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$this->timerOrder[$watcherId] = $watcher->nextExecutionAt = $nextExecutionAt;
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$this->isTimerSortNeeded = true;
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}
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$this->watchers[$watcherId] = $watcher;
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return $watcherId;
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}
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/**
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* {@inheritDoc}
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*/
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public function onReadable($stream, callable $callback, array $options = []) {
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return $this->registerIoWatcher($stream, $callback, $options, Watcher::IO_READER);
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}
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/**
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* {@inheritDoc}
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*/
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public function onWritable($stream, callable $callback, array $options = []) {
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return $this->registerIoWatcher($stream, $callback, $options, Watcher::IO_WRITER);
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}
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private function registerIoWatcher($stream, $callback, $options, $type) {
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/* In the php7 branch we use an anonymous class with Struct for this.
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* Using a stdclass isn't terribly readable and it's prone to error but
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* it's the easiest way to minimize the distance between 5.x and 7 code
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* and keep maintenance simple.
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*/
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$watcher = new \StdClass;
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$watcher->id = $watcherId = \spl_object_hash($watcher);
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$watcher->type = $type;
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$watcher->callback = $callback;
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$watcher->cbData = @$options["cb_data"];
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$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
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$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
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$watcher->stream = $stream;
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$watcher->streamId = $streamId = (int) $stream;
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if ($watcher->isEnabled) {
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$this->keepAliveCount += $watcher->keepAlive;
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if ($type === Watcher::IO_READER) {
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$this->readStreams[$streamId] = $stream;
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$this->readWatchers[$streamId][$watcherId] = $watcher;
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} else {
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$this->writeStreams[$streamId] = $stream;
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$this->writeWatchers[$streamId][$watcherId] = $watcher;
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}
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}
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$this->watchers[$watcherId] = $watcher;
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return $watcherId;
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}
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/**
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* {@inheritDoc}
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* @throws \RuntimeException if ext/pcntl unavailable or signal handler registration fails
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*/
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public function onSignal($signo, callable $func, array $options = []) {
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if (empty($this->hasExtPcntl)) {
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throw new \RuntimeException(
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"Cannot react to signals; ext/pcntl not loaded"
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);
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}
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$signo = (int) $signo;
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$watcher = new \StdClass;
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$watcher->id = $watcherId = \spl_object_hash($watcher);
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$watcher->type = Watcher::SIGNAL;
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$watcher->callback = $func;
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$watcher->cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
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$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
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$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
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$watcher->signo = $signo;
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if ($watcher->isEnabled) {
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if (empty($this->signalState->handlers[$signo]) && !@\pcntl_signal($signo, $this->signalHandler)) {
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throw new \RuntimeException(
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"Failed registering signal handler"
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);
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}
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$this->signalState->shouldDispatch = true;
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$this->signalState->handlers[$signo][$watcherId] = $watcher;
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$this->keepAliveCount += $watcher->keepAlive;
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}
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$this->watchers[$watcherId] = $watcher;
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return $watcherId;
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}
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/**
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* {@inheritDoc}
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*/
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public function onError(callable $func) {
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$this->onCoroutineResolution = static function($e = null, $r = null) use ($func) {
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if ($e) {
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\call_user_func($func, $e);
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}
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};
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}
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/**
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* {@inheritDoc}
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*/
|
|
public function cancel($watcherId) {
|
|
$this->disable($watcherId);
|
|
unset(
|
|
$this->watchers[$watcherId],
|
|
$this->timerOrder[$watcherId]
|
|
);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function enable($watcherId) {
|
|
if (!isset($this->watchers[$watcherId])) {
|
|
return;
|
|
}
|
|
|
|
$watcher = $this->watchers[$watcherId];
|
|
if ($watcher->isEnabled) {
|
|
// If the watcher is already enabled we're finished here
|
|
return;
|
|
}
|
|
|
|
$watcher->isEnabled = true;
|
|
$this->keepAliveCount += $watcher->keepAlive;
|
|
|
|
switch ($watcher->type) {
|
|
case Watcher::TIMER_ONCE:
|
|
case Watcher::TIMER_REPEAT:
|
|
if (!isset($watcher->nextExecutionAt)) {
|
|
$watcher->nextExecutionAt = microtime(true) + $watcher->msDelay;
|
|
}
|
|
$this->isTimerSortNeeded = true;
|
|
$this->timerOrder[$watcherId] = $watcher->nextExecutionAt;
|
|
break;
|
|
case Watcher::IO_READER:
|
|
$streamId = (int) $watcher->stream;
|
|
$this->readStreams[$streamId] = $watcher->stream;
|
|
$this->readWatchers[$streamId][$watcherId] = $watcher;
|
|
break;
|
|
case Watcher::IO_WRITER:
|
|
$streamId = (int) $watcher->stream;
|
|
$this->writeStreams[$streamId] = $watcher->stream;
|
|
$this->writeWatchers[$streamId][$watcherId] = $watcher;
|
|
break;
|
|
case Watcher::IMMEDIATE:
|
|
$this->immediates[$watcherId] = $watcher;
|
|
break;
|
|
case Watcher::SIGNAL:
|
|
$signo = $watcher->signo;
|
|
if (empty($this->signalState->handlers[$signo])) {
|
|
\pcntl_signal($signo, $this->signalHandler);
|
|
}
|
|
$this->signalState->handlers[$signo][$watcherId] = $watcher;
|
|
$this->signalState->shouldDispatch = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function disable($watcherId) {
|
|
if (!isset($this->watchers[$watcherId])) {
|
|
return;
|
|
}
|
|
|
|
$watcher = $this->watchers[$watcherId];
|
|
if (!$watcher->isEnabled) {
|
|
return;
|
|
}
|
|
|
|
$watcher->isEnabled = false;
|
|
$this->keepAliveCount -= $watcher->keepAlive;
|
|
|
|
switch ($watcher->type) {
|
|
case Watcher::TIMER_ONCE:
|
|
case Watcher::TIMER_REPEAT:
|
|
unset($this->timerOrder[$watcherId]);
|
|
break;
|
|
case Watcher::IO_READER:
|
|
$streamId = $watcher->streamId;
|
|
unset($this->readWatchers[$streamId][$watcherId]);
|
|
if (empty($this->readWatchers[$streamId])) {
|
|
unset($this->readStreams[$streamId]);
|
|
}
|
|
break;
|
|
case Watcher::IO_WRITER:
|
|
$streamId = $watcher->streamId;
|
|
unset($this->writeWatchers[$streamId][$watcherId]);
|
|
if (empty($this->writeWatchers[$streamId])) {
|
|
unset($this->writeStreams[$streamId]);
|
|
}
|
|
break;
|
|
case Watcher::IMMEDIATE:
|
|
unset($this->immediates[$watcherId]);
|
|
break;
|
|
case Watcher::SIGNAL:
|
|
$signo = $watcher->signo;
|
|
unset($this->signalState->handlers[$signo][$watcherId]);
|
|
if (empty($this->signalState->handlers[$signo])) {
|
|
unset($this->signalState->handlers[$signo]);
|
|
\pcntl_signal($signo, \SIG_DFL);
|
|
if (empty($this->signalState->handlers)) {
|
|
$this->signalState->shouldDispatch = false;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function info() {
|
|
$once = $repeat = $immediately = $onReadable = $onWritable = $onSignal = [
|
|
"enabled" => 0,
|
|
"disabled" => 0,
|
|
];
|
|
foreach ($this->watchers as $watcher) {
|
|
switch ($watcher->type) {
|
|
case Watcher::IMMEDIATE: $arr =& $immediately; break;
|
|
case Watcher::TIMER_ONCE: $arr =& $once; break;
|
|
case Watcher::TIMER_REPEAT: $arr =& $repeat; break;
|
|
case Watcher::IO_READER: $arr =& $onReadable; break;
|
|
case Watcher::IO_WRITER: $arr =& $onWritable; break;
|
|
case Watcher::SIGNAL: $arr =& $onSignal; break;
|
|
}
|
|
if ($watcher->isEnabled) {
|
|
$arr["enabled"] += 1;
|
|
} else {
|
|
$arr["disabled"] += 1;
|
|
}
|
|
}
|
|
|
|
return [
|
|
"immediately" => $immediately,
|
|
"once" => $once,
|
|
"repeat" => $repeat,
|
|
"on_readable" => $onReadable,
|
|
"on_writable" => $onWritable,
|
|
"on_signal" => $onSignal,
|
|
"keep_alive" => $this->keepAliveCount,
|
|
];
|
|
}
|
|
|
|
public function __debugInfo() {
|
|
return $this->info();
|
|
}
|
|
}
|