mirror of
https://github.com/danog/amp.git
synced 2024-12-15 10:57:19 +01:00
493 lines
15 KiB
PHP
493 lines
15 KiB
PHP
<?php
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namespace Amp;
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class LibeventReactor implements ExtensionReactor {
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private $base;
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private $watchers = [];
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private $immediates = [];
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private $lastWatcherId = "a";
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private $enabledWatcherCount = 0;
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private $resolution = 1000;
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private $isRunning = false;
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private $stopException;
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private $onError;
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private $onCoroutineResolution;
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/* Pre-PHP7 closure GC hack vars */
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private $gcEvent;
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private $garbage = [];
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private $isGcScheduled = false;
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private static $instanceCount = 0;
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public function __construct() {
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if (!extension_loaded("libevent")) {
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throw new \RuntimeException(
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"The pecl libevent extension is required to use the LibeventReactor."
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);
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}
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$this->base = event_base_new();
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/**
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* Prior to PHP7 we can't cancel closure watchers inside their own callbacks
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* because PHP will fatal. In legacy versions we schedule manual GC workarounds.
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*
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* @link https://bugs.php.net/bug.php?id=62452
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*/
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if (PHP_MAJOR_VERSION < 7) {
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$this->gcEvent = event_new();
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event_timer_set($this->gcEvent, function() {
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$this->garbage = [];
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$this->isGcScheduled = false;
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event_del($this->gcEvent);
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});
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event_base_set($this->gcEvent, $this->base);
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}
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$this->onCoroutineResolution = function($e = null, $r = null) {
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if ($e) {
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$this->onCallbackError($e);
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}
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};
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self::$instanceCount++;
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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->isRunning) {
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return;
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}
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$this->isRunning = true;
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if ($onStart) {
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$this->immediately($onStart);
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}
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while ($this->isRunning) {
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if ($this->immediates && !$this->doImmediates()) {
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break;
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}
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if (empty($this->enabledWatcherCount)) {
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break;
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}
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event_base_loop($this->base, EVLOOP_ONCE | (empty($this->immediates) ? 0 : EVLOOP_NONBLOCK));
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}
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if ($this->stopException) {
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$e = $this->stopException;
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$this->stopException = null;
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throw $e;
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}
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}
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private function doImmediates() {
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$immediates = $this->immediates;
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foreach ($immediates as $watcherId => $watcher) {
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try {
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$this->enabledWatcherCount--;
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unset(
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$this->immediates[$watcherId],
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$this->watchers[$watcherId]
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);
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$result = call_user_func($watcher->callback, $this, $watcherId, $watcher->callbackData);
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if ($result instanceof \Generator) {
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resolve($result, $this)->when($this->onCoroutineResolution);
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}
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} catch (\Exception $e) {
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$this->onCallbackError($e);
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}
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if (!$this->isRunning) {
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// If one of the immediately watchers stops the reactor break out of the loop
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return false;
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}
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}
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return $this->isRunning;
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}
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/**
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* {@inheritDoc}
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*/
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public function tick($noWait = false) {
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if ($this->isRunning) {
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return;
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}
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$noWait = (bool) $noWait;
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$this->isRunning = true;
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if (empty($this->immediates) || $this->doImmediates()) {
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$flags = $noWait || !empty($this->immediates) ? (EVLOOP_ONCE | EVLOOP_NONBLOCK) : EVLOOP_ONCE;
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event_base_loop($this->base, $flags);
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}
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$this->isRunning = false;
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if ($this->stopException) {
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$e = $this->stopException;
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$this->stopException = null;
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throw $e;
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}
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}
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/**
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* {@inheritDoc}
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*/
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public function stop() {
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event_base_loopexit($this->base);
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$this->isRunning = false;
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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 = $this->initWatcher(Watcher::IMMEDIATE, $callback, $options);
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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$this->immediates[$watcher->id] = $watcher;
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}
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return $watcher->id;
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}
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private function initWatcher($type, $callback, $options) {
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$watcherId = $this->lastWatcherId++;
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$this->watchers[$watcherId] = $watcher = new \StdClass;
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$watcher->id = $watcherId;
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$watcher->type = $type;
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$watcher->callback = $callback;
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$watcher->callbackData = @$options["cb_data"];
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$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
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if ($type !== Watcher::IMMEDIATE) {
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$watcher->eventResource = event_new();
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}
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return $watcher;
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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 $options = []) {
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assert(($msDelay >= 0), "\$msDelay at Argument 2 expects integer >= 0");
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$watcher = $this->initWatcher(Watcher::TIMER_ONCE, $callback, $options);
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$watcher->msDelay = ($msDelay * $this->resolution);
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event_timer_set($watcher->eventResource, $this->wrapCallback($watcher));
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event_base_set($watcher->eventResource, $this->base);
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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event_add($watcher->eventResource, $watcher->msDelay);
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}
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return $watcher->id;
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}
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private function wrapCallback($watcher) {
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return function() use ($watcher) {
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try {
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switch ($watcher->type) {
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case Watcher::IO_READER:
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// fallthrough
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case Watcher::IO_WRITER:
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$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->stream, $watcher->callbackData);
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break;
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case Watcher::TIMER_ONCE:
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$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->callbackData);
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$this->cancel($watcher->id);
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break;
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case Watcher::TIMER_REPEAT:
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$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->callbackData);
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// If the watcher cancelled itself this will no longer exist
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if (isset($this->watchers[$watcher->id])) {
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event_add($watcher->eventResource, $watcher->msInterval);
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}
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break;
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case Watcher::SIGNAL:
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$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->signo, $watcher->callbackData);
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break;
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default:
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throw new \RuntimeException("Unexpected Watcher type encountered");
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}
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if ($result instanceof \Generator) {
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resolve($result, $this)->when($this->onCoroutineResolution);
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}
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} catch (\Exception $e) {
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$this->onCallbackError($e);
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}
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};
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}
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private function onCallbackError(\Exception $e) {
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if (empty($this->onError)) {
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$this->stopException = $e;
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$this->stop();
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} else {
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$this->tryUserErrorCallback($e);
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}
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}
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private function tryUserErrorCallback(\Exception $e) {
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try {
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call_user_func($this->onError, $e);
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} catch (\Exception $e) {
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$this->stopException = $e;
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$this->stop();
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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 repeat(callable $callback, $msInterval, array $options = []) {
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assert(($msInterval >= 0), "\$msInterval at Argument 2 expects integer >= 0");
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if (isset($options["ms_delay"])) {
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$msDelay = (int) $options["ms_delay"];
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assert(($msDelay >= 0), "ms_delay option expects integer >= 0");
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$msDelay = ($msDelay * $this->resolution);
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} else {
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$msDelay = $msInterval;
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}
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$watcher = $this->initWatcher(Watcher::TIMER_REPEAT, $callback, $options);
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$watcher->msInterval = (int) $msInterval;
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event_timer_set($watcher->eventResource, $this->wrapCallback($watcher));
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event_base_set($watcher->eventResource, $this->base);
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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event_add($watcher->eventResource, $msDelay);
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}
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return $watcher->id;
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}
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/**
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* {@inheritDoc}
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*/
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public function onReadable($stream, callable $callback, array $options = []) {
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$watcher = $this->initWatcher(Watcher::IO_READER, $callback, $options);
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$watcher->stream = $stream;
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$evFlags = EV_PERSIST|EV_READ;
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event_set($watcher->eventResource, $stream, $evFlags, $this->wrapCallback($watcher));
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event_base_set($watcher->eventResource, $this->base);
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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event_add($watcher->eventResource);
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}
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return $watcher->id;
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}
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/**
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* {@inheritDoc}
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*/
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public function onWritable($stream, callable $callback, array $options = []) {
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$watcher = $this->initWatcher(Watcher::IO_WRITER, $callback, $options);
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$watcher->stream = $stream;
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$evFlags = EV_PERSIST|EV_WRITE;
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event_set($watcher->eventResource, $stream, $evFlags, $this->wrapCallback($watcher));
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event_base_set($watcher->eventResource, $this->base);
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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event_add($watcher->eventResource);
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}
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return $watcher->id;
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}
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/**
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* {@inheritDoc}
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*/
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public function onSignal($signo, callable $callback, array $options = []) {
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$watcher = $this->initWatcher(Watcher::SIGNAL, $callback, $options);
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$watcher->signo = $signo = (int) $signo;
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$evFlags = EV_SIGNAL | EV_PERSIST;
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event_set($watcher->eventResource, $signo, $evFlags, $this->wrapCallback($watcher));
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event_base_set($watcher->eventResource, $this->base);
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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event_add($watcher->eventResource);
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}
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return $watcher->id;
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}
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/**
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* {@inheritDoc}
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*/
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public function cancel($watcherId) {
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if (empty($this->watchers[$watcherId])) {
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return;
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}
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$watcher = $this->watchers[$watcherId];
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount--;
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}
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if ($watcher->type === Watcher::IMMEDIATE) {
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unset(
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$this->immediates[$watcherId],
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$this->watchers[$watcherId]
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);
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} else {
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event_del($watcher->eventResource);
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unset($this->watchers[$watcherId]);
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}
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if (PHP_MAJOR_VERSION < 7) {
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$this->garbage[] = $watcher;
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$this->scheduleGarbageCollection();
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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 disable($watcherId) {
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if (empty($this->watchers[$watcherId])) {
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return;
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}
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$watcher = $this->watchers[$watcherId];
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if (!$watcher->isEnabled) {
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return;
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}
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switch ($watcher->type) {
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case Watcher::IMMEDIATE:
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unset($this->immediates[$watcherId]);
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break;
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case Watcher::IO_READER: // fallthrough
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case Watcher::IO_WRITER: // fallthrough
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case Watcher::SIGNAL: // fallthrough
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case Watcher::TIMER_ONCE: // fallthrough
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case Watcher::TIMER_REPEAT:
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event_del($watcher->eventResource);
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break;
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default:
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throw new \RuntimeException("Unexpected Watcher type encountered");
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}
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$watcher->isEnabled = false;
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$this->enabledWatcherCount--;
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}
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/**
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* {@inheritDoc}
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*/
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public function enable($watcherId) {
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if (empty($this->watchers[$watcherId])) {
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return;
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}
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$watcher = $this->watchers[$watcherId];
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if ($watcher->isEnabled) {
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return;
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}
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switch ($watcher->type) {
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case Watcher::IMMEDIATE:
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$this->immediates[$watcherId] = $watcher;
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break;
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case Watcher::TIMER_ONCE:
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event_add($watcher->eventResource, $watcher->msDelay);
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break;
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case Watcher::TIMER_REPEAT:
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event_add($watcher->eventResource, $watcher->msInterval);
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break;
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case Watcher::IO_READER: // fallthrough
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case Watcher::IO_WRITER: // fallthrough
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case Watcher::SIGNAL:
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event_add($watcher->eventResource);
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break;
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default:
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throw new \RuntimeException("Unexpected Watcher type encountered");
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}
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$watcher->isEnabled = true;
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$this->enabledWatcherCount++;
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}
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private function scheduleGarbageCollection() {
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if (!$this->isGcScheduled) {
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event_add($this->gcEvent, 0);
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$this->isGcScheduled = true;
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}
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}
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/**
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* Access the underlying libevent extension event base
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*
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* This method exists outside the base Reactor API. It provides access to the underlying
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* libevent base for code that wishes to interact with lower-level libevent extension
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* functionality.
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*
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* @return resource
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*/
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public function getUnderlyingLoop() {
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return $this->base;
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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 $callback) {
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$this->onError = $callback;
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}
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public function __destruct() {
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self::$instanceCount--;
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}
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public function __debugInfo() {
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$immediates = $timers = $readers = $writers = $signals = $disabled = 0;
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foreach ($this->watchers as $watcher) {
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switch ($watcher->type) {
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case Watcher::IMMEDIATE:
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$immediates++;
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break;
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case Watcher::TIMER_ONCE:
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case Watcher::TIMER_REPEAT:
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$timers++;
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break;
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case Watcher::IO_READER:
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$readers++;
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break;
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case Watcher::IO_WRITER:
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$writers++;
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break;
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case Watcher::SIGNAL:
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$signals++;
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break;
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default:
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throw new \DomainException(
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"Unexpected watcher type: {$watcher->type}"
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);
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}
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$disabled += !$watcher->isEnabled;
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}
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return [
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'enabled' => $this->enabledWatcherCount,
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'timers' => $timers,
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'immediates' => $immediates,
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'io_readers' => $readers,
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'io_writers' => $writers,
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'signals' => $signals,
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'disabled' => $disabled,
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'last_watcher_id' => $this->lastWatcherId,
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'instances' => self::$instanceCount,
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];
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}
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}
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