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amp/lib/EvReactor.php

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<?php
namespace Amp;
use Ev;
use EvIo;
use EvLoop;
use EvTimer;
use EvSignal;
class EvReactor implements ExtensionReactor {
private static $instanceCount = 0;
private $loop;
private $lastWatcherId = "a";
private $enabledWatchers = [];
private $disabledWatchers = [];
private $enabledImmediates = [];
private $disabledImmediates = [];
private $isRunning = false;
private $stopException;
private $onError;
private $onCoroutineResolution;
public function __construct($flags = null) {
if (!extension_loaded("ev")) {
throw new \RuntimeException(
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"The pecl ev extension is required to use the EvReactor."
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);
}
$flags = $flags ?: Ev::FLAG_AUTO;
$this->loop = new EvLoop($flags);
$this->onCoroutineResolution = function ($e = null, $r = null) {
if ($e) {
$this->onCallbackError($e);
}
};
self::$instanceCount++;
}
public function __destruct() {
self::$instanceCount--;
foreach (array_keys($this->enabledWatchers) as $watcherId) {
$this->cancel($watcherId);
}
foreach (array_keys($this->disabledWatchers) as $watcherId) {
$this->cancel($watcherId);
}
}
/**
* {@inheritdoc}
*/
public function run(callable $onStart = null) {
if ($this->isRunning) {
return;
}
$this->isRunning = true;
if ($onStart) {
$this->immediately($onStart);
}
while ($this->isRunning) {
$immediates = $this->enabledImmediates;
foreach ($immediates as $watcherId => $immediateArr) {
list($callback, $cbData) = $immediateArr;
if (!$this->tryImmediate($watcherId, $callback, $cbData)) {
break;
}
}
if (!($this->enabledWatchers || $this->enabledImmediates)) {
break;
}
$flags = $this->enabledImmediates ? (Ev::RUN_ONCE | Ev::RUN_NOWAIT) : Ev::RUN_ONCE;
$this->loop->run($flags);
}
if ($this->stopException) {
$e = $this->stopException;
$this->stopException = null;
throw $e;
}
}
private function tryImmediate($watcherId, $callback, $cbData) {
try {
unset($this->enabledImmediates[$watcherId]);
$out = \call_user_func($callback, $this, $watcherId, $cbData);
if ($out instanceof \Generator) {
Coroutine::resolve($out, $this)->when($this->onCoroutineResolution);
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}
} catch (\Exception $e) {
$this->onCallbackError($e);
}
return $this->isRunning;
}
private function onCallbackError(\Exception $e) {
if (empty($this->onError)) {
$this->stopException = $e;
$this->stop();
} else {
$this->tryUserErrorCallback($e);
}
}
private function tryUserErrorCallback(\Exception $e) {
try {
\call_user_func($this->onError, $e);
} catch (\Exception $e) {
$this->stopException = $e;
$this->stop();
}
}
/**
* {@inheritdoc}
*/
public function tick($noWait = false) {
if ($this->isRunning) {
// If we're already running/ticking this method is superfluous
return;
}
$noWait = (bool) $noWait;
$this->isRunning = true;
$immediates = $this->enabledImmediates;
foreach ($immediates as $watcherId => $immediateArr) {
list($callback, $cbData) = $immediateArr;
if (!$this->tryImmediate($watcherId, $callback, $cbData)) {
break;
}
}
if ($this->isRunning) {
$flags = $noWait || $this->enabledImmediates ? Ev::RUN_NOWAIT | Ev::RUN_ONCE : Ev::RUN_ONCE;
$this->loop->run($flags);
$this->isRunning = false;
}
if ($this->stopException) {
$e = $this->stopException;
$this->stopException = null;
throw $e;
}
}
/**
* {@inheritDoc}
*/
public function stop() {
$this->loop->stop();
$this->isRunning = false;
}
/**
* {@inheritdoc}
*/
public function immediately(callable $callback, array $options = []) {
$watcherId = $this->lastWatcherId++;
$cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
if ($isEnabled) {
$this->enabledImmediates[$watcherId] = [$callback, $cbData];
} else {
$this->disabledImmediates[$watcherId] = [$callback, $cbData];
}
return $watcherId;
}
/**
* {@inheritdoc}
*/
public function once(callable $callback, $msDelay, array $options = []) {
$type = Watcher::TIMER_ONCE;
$msInterval = 0.0;
// @TODO assert($msDelay > 0)
return $this->registerTimer($type, $callback, $msDelay, $msInterval, $options);
}
/**
* {@inheritdoc}
*/
public function repeat(callable $callback, $msInterval, array $options = []) {
$type = Watcher::TIMER_REPEAT;
$msDelay = isset($options["ms_delay"]) ? $options["ms_delay"] : $msInterval;
if ($msInterval == 0) {
$msInterval = 1;
}
return $this->registerTimer($type, $callback, $msDelay, $msInterval, $options);
}
private function registerTimer($type, $callback, $msDelay, $msInterval, $options = []) {
// ev uses one second resolution
$msDelay = $msDelay/1000;
$msInterval = $msInterval/1000;
$watcherId = $this->lastWatcherId++;
$wrappedCallback = $this->wrapWatcherCallback($type, $watcherId, $callback);
$cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
$watcher = $this->loop->timer($msDelay, $msInterval, $wrappedCallback, $cbData);
if ($isEnabled) {
$this->enabledWatchers[$watcherId] = $watcher;
} else {
$watcher->stop();
$this->disabledWatchers[$watcherId] = $watcher;
}
return $watcherId;
}
private function wrapWatcherCallback($type, $watcherId, $callback, $stream = null) {
return function($evHandle) use ($type, $watcherId, $callback, $stream) {
try {
if ($type === Watcher::TIMER_ONCE) {
unset($this->enabledWatchers[$watcherId]);
$out = \call_user_func($callback, $this, $watcherId, $evHandle->data);
} elseif ($type & Watcher::IO) {
$out = \call_user_func($callback, $this, $watcherId, $stream, $evHandle->data);
} else {
$out = \call_user_func($callback, $this, $watcherId, $evHandle->data);
}
if ($out instanceof \Generator) {
Coroutine::resolve($out, $this)->when($this->onCoroutineResolution);
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}
} catch (\Exception $e) {
$this->onCallbackError($e);
}
};
}
/**
* {@inheritdoc}
*/
public function onReadable($stream, callable $callback, array $options = []) {
return $this->registerIo($events = Ev::READ, $stream, $callback, $options);
}
/**
* {@inheritdoc}
*/
public function onWritable($stream, callable $callback, array $options = []) {
return $this->registerIo($events = Ev::WRITE, $stream, $callback, $options);
}
private function registerIo($events, $stream, $callback, $options) {
$watcherId = $this->lastWatcherId++;
$type = Watcher::IO;
$wrappedCallback = $this->wrapWatcherCallback($type, $watcherId, $callback, $stream);
$cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
$watcher = $this->loop->io($stream, $events, $wrappedCallback, $cbData);
if ($isEnabled) {
$this->enabledWatchers[$watcherId] = $watcher;
} else {
$watcher->stop();
$this->disabledWatchers[$watcherId] = $watcher;
}
return $watcherId;
}
/**
* {@inheritDoc}
*/
public function onSignal($signo, callable $callback, array $options = []) {
$watcherId = $this->lastWatcherId++;
$type = Watcher::SIGNAL;
$wrappedCallback = $this->wrapWatcherCallback($type, $watcherId, $callback);
$cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
$watcher = $this->loop->signal($signo, $wrappedCallback, $cbData);
if ($isEnabled) {
$this->enabledWatchers[$watcherId] = $watcher;
} else {
$timer->stop();
$this->disabledWatchers[$watcherId] = $watcher;
}
return $watcherId;
}
/**
* {@inheritdoc}
*/
public function cancel($watcherId) {
if (isset($this->enabledWatchers[$watcherId])) {
$watcher = $this->enabledWatchers[$watcherId];
$watcher->clear();
$watcher->stop();
unset($this->enabledWatchers[$watcherId]);
} elseif (isset($this->disabledWatchers[$watcherId])) {
$watcher = $this->disabledWatchers[$watcherId];
$watcher->clear();
unset($this->disabledWatchers[$watcherId]);
} elseif (isset($this->enabledImmediates[$watcherId])) {
$watcher = $this->enabledImmediates[$watcherId];
unset($this->enabledImmediates[$watcherId]);
} elseif (isset($this->disabledImmediates[$watcherId])) {
$watcher = $this->disabledImmediates[$watcherId];
unset($this->disabledImmediates[$watcherId]);
} else {
return;
}
}
/**
* {@inheritdoc}
*/
public function disable($watcherId) {
if (isset($this->enabledWatchers[$watcherId])) {
$evHandle = $this->enabledWatchers[$watcherId];
unset($this->enabledWatchers[$watcherId]);
$this->disabledWatchers[$watcherId] = $evHandle;
$evHandle->stop();
} elseif (isset($this->enabledImmediates[$watcherId])) {
$immediateArr = $this->enabledImmediates[$watcherId];
$this->disabledImmediates[$watcherId] = $immediateArr;
unset($this->enabledImmediates[$watcherId]);
}
}
/**
* {@inheritdoc}
*/
public function enable($watcherId) {
if (isset($this->disabledWatchers[$watcherId])) {
$evHandle = $this->disabledWatchers[$watcherId];
unset($this->disabledWatchers[$watcherId]);
$this->enabledWatchers[$watcherId] = $evHandle;
$evHandle->start();
} elseif (isset($this->disabledImmediates[$watcherId])) {
$immediateArr = $this->disabledImmediates[$watcherId];
$this->enabledImmediates[$watcherId] = $immediateArr;
unset($this->disabledImmediates[$watcherId]);
}
}
/**
* {@inheritdoc}
*/
public function onError(callable $callback) {
$this->onError = $callback;
}
/**
* {@inheritdoc}
*/
public function getUnderlyingLoop() {
return $this->loop;
}
}