mirror of
https://github.com/danog/amp.git
synced 2024-11-27 12:35:02 +01:00
489 lines
15 KiB
PHP
489 lines
15 KiB
PHP
<?php
|
|
|
|
namespace Amp;
|
|
|
|
class LibeventReactor implements SignalReactor {
|
|
private $base;
|
|
private $watchers = [];
|
|
private $immediates = [];
|
|
private $lastWatcherId = "a";
|
|
private $enabledWatcherCount = 0;
|
|
private $resolution = 1000;
|
|
private $isRunning = false;
|
|
private $stopException;
|
|
private $onError;
|
|
private $onCoroutineResolution;
|
|
|
|
/* Pre-PHP7 closure GC hack vars */
|
|
private $gcEvent;
|
|
private $garbage = [];
|
|
private $isGcScheduled = false;
|
|
|
|
private static $instanceCount = 0;
|
|
|
|
public function __construct() {
|
|
if (!extension_loaded('libevent')) {
|
|
throw new \RuntimeException('The pecl-libevent extension is required to use the LibeventReactor.');
|
|
}
|
|
|
|
$this->base = event_base_new();
|
|
|
|
/**
|
|
* Prior to PHP7 we can't cancel closure watchers inside their own callbacks
|
|
* because PHP will fatal. In legacy versions we schedule manual GC workarounds.
|
|
*
|
|
* @link https://bugs.php.net/bug.php?id=62452
|
|
*/
|
|
if (PHP_MAJOR_VERSION < 7) {
|
|
$this->gcEvent = event_new();
|
|
event_timer_set($this->gcEvent, function() {
|
|
$this->garbage = [];
|
|
$this->isGcScheduled = false;
|
|
event_del($this->gcEvent);
|
|
});
|
|
event_base_set($this->gcEvent, $this->base);
|
|
}
|
|
|
|
$this->onCoroutineResolution = function($e = null, $r = null) {
|
|
if ($e) {
|
|
$this->onCallbackError($e);
|
|
}
|
|
};
|
|
|
|
self::$instanceCount++;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function run(callable $onStart = null) {
|
|
if ($this->isRunning) {
|
|
return;
|
|
}
|
|
|
|
$this->isRunning = true;
|
|
if ($onStart) {
|
|
$this->immediately($onStart);
|
|
}
|
|
|
|
while ($this->isRunning) {
|
|
if ($this->immediates && !$this->doImmediates()) {
|
|
break;
|
|
}
|
|
if (empty($this->enabledWatcherCount)) {
|
|
break;
|
|
}
|
|
event_base_loop($this->base, EVLOOP_ONCE | (empty($this->immediates) ? 0 : EVLOOP_NONBLOCK));
|
|
}
|
|
|
|
if ($this->stopException) {
|
|
$e = $this->stopException;
|
|
$this->stopException = null;
|
|
throw $e;
|
|
}
|
|
}
|
|
|
|
private function doImmediates() {
|
|
$immediates = $this->immediates;
|
|
foreach ($immediates as $watcherId => $watcher) {
|
|
try {
|
|
$this->enabledWatcherCount--;
|
|
unset(
|
|
$this->immediates[$watcherId],
|
|
$this->watchers[$watcherId]
|
|
);
|
|
$result = call_user_func($watcher->callback, $this, $watcherId, $watcher->callbackData);
|
|
if ($result instanceof \Generator) {
|
|
resolve($result, $this)->when($this->onCoroutineResolution);
|
|
}
|
|
} catch (\Exception $e) {
|
|
$this->onCallbackError($e);
|
|
}
|
|
|
|
if (!$this->isRunning) {
|
|
// If one of the immediately watchers stops the reactor break out of the loop
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return $this->isRunning;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function tick($noWait = false) {
|
|
if ($this->isRunning) {
|
|
return;
|
|
}
|
|
|
|
$noWait = (bool) $noWait;
|
|
$this->isRunning = true;
|
|
|
|
if (empty($this->immediates) || $this->doImmediates()) {
|
|
$flags = $noWait || !empty($this->immediates) ? (EVLOOP_ONCE | EVLOOP_NONBLOCK) : EVLOOP_ONCE;
|
|
event_base_loop($this->base, $flags);
|
|
}
|
|
|
|
$this->isRunning = false;
|
|
|
|
if ($this->stopException) {
|
|
$e = $this->stopException;
|
|
$this->stopException = null;
|
|
throw $e;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function stop() {
|
|
event_base_loopexit($this->base);
|
|
$this->isRunning = false;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function immediately(callable $callback, array $options = []) {
|
|
$watcher = $this->initWatcher(Watcher::IMMEDIATE, $callback, $options);
|
|
if ($watcher->isEnabled) {
|
|
$this->enabledWatcherCount++;
|
|
$this->immediates[$watcher->id] = $watcher;
|
|
}
|
|
|
|
return $watcher->id;
|
|
}
|
|
|
|
private function initWatcher($type, $callback, $options) {
|
|
$watcherId = $this->lastWatcherId++;
|
|
$this->watchers[$watcherId] = $watcher = new \StdClass;
|
|
$watcher->id = $watcherId;
|
|
$watcher->type = $type;
|
|
$watcher->callback = $callback;
|
|
$watcher->callbackData = @$options["cb_data"];
|
|
$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
|
|
|
|
if ($type !== Watcher::IMMEDIATE) {
|
|
$watcher->eventResource = event_new();
|
|
}
|
|
|
|
return $watcher;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function once(callable $callback, $msDelay, array $options = []) {
|
|
assert(($msDelay >= 0), "\$msDelay at Argument 2 expects integer >= 0");
|
|
$watcher = $this->initWatcher(Watcher::TIMER_ONCE, $callback, $options);
|
|
$watcher->msDelay = ($msDelay * $this->resolution);
|
|
event_timer_set($watcher->eventResource, $this->wrapCallback($watcher));
|
|
event_base_set($watcher->eventResource, $this->base);
|
|
|
|
if ($watcher->isEnabled) {
|
|
$this->enabledWatcherCount++;
|
|
event_add($watcher->eventResource, $watcher->msDelay);
|
|
}
|
|
|
|
return $watcher->id;
|
|
}
|
|
|
|
private function wrapCallback($watcher) {
|
|
return function() use ($watcher) {
|
|
try {
|
|
switch ($watcher->type) {
|
|
case Watcher::IO_READER:
|
|
// fallthrough
|
|
case Watcher::IO_WRITER:
|
|
$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->stream, $watcher->callbackData);
|
|
break;
|
|
case Watcher::TIMER_ONCE:
|
|
$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->callbackData);
|
|
$this->cancel($watcher->id);
|
|
break;
|
|
case Watcher::TIMER_REPEAT:
|
|
$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->callbackData);
|
|
// If the watcher cancelled itself this will no longer exist
|
|
if (isset($this->watchers[$watcher->id])) {
|
|
event_add($watcher->eventResource, $watcher->msInterval);
|
|
}
|
|
break;
|
|
case Watcher::SIGNAL:
|
|
$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->signo, $watcher->callbackData);
|
|
break;
|
|
default:
|
|
throw new \RuntimeException("Unexpected Watcher type encountered");
|
|
}
|
|
if ($result instanceof \Generator) {
|
|
resolve($result, $this)->when($this->onCoroutineResolution);
|
|
}
|
|
} catch (\Exception $e) {
|
|
$this->onCallbackError($e);
|
|
}
|
|
};
|
|
}
|
|
|
|
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 repeat(callable $callback, $msInterval, array $options = []) {
|
|
assert(($msInterval >= 0), "\$msInterval at Argument 2 expects integer >= 0");
|
|
if (isset($options["ms_delay"])) {
|
|
$msDelay = (int) $options["ms_delay"];
|
|
assert(($msDelay >= 0), "ms_delay option expects integer >= 0");
|
|
$msDelay = ($msDelay * $this->resolution);
|
|
} else {
|
|
$msDelay = $msInterval;
|
|
}
|
|
|
|
$watcher = $this->initWatcher(Watcher::TIMER_REPEAT, $callback, $options);
|
|
$watcher->msInterval = (int) $msInterval;
|
|
event_timer_set($watcher->eventResource, $this->wrapCallback($watcher));
|
|
event_base_set($watcher->eventResource, $this->base);
|
|
if ($watcher->isEnabled) {
|
|
$this->enabledWatcherCount++;
|
|
event_add($watcher->eventResource, $msDelay);
|
|
}
|
|
|
|
return $watcher->id;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function onReadable($stream, callable $callback, array $options = []) {
|
|
$watcher = $this->initWatcher(Watcher::IO_READER, $callback, $options);
|
|
$evFlags = EV_PERSIST|EV_READ;
|
|
event_set($watcher->eventResource, $stream, $evFlags, $this->wrapCallback($watcher));
|
|
event_base_set($watcher->eventResource, $this->base);
|
|
if ($watcher->isEnabled) {
|
|
$this->enabledWatcherCount++;
|
|
event_add($watcher->eventResource);
|
|
}
|
|
|
|
return $watcher->id;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function onWritable($stream, callable $callback, array $options = []) {
|
|
$watcher = $this->initWatcher(Watcher::IO_WRITER, $callback, $options);
|
|
$evFlags = EV_PERSIST|EV_WRITE;
|
|
event_set($watcher->eventResource, $stream, $evFlags, $this->wrapCallback($watcher));
|
|
event_base_set($watcher->eventResource, $this->base);
|
|
if ($watcher->isEnabled) {
|
|
$this->enabledWatcherCount++;
|
|
event_add($watcher->eventResource);
|
|
}
|
|
|
|
return $watcher->id;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function onSignal($signo, callable $callback, array $options = []) {
|
|
$watcher = $this->initWatcher(Watcher::SIGNAL, $callback, $options);
|
|
$watcher->signo = $signo = (int) $signo;
|
|
$evFlags = EV_SIGNAL | EV_PERSIST;
|
|
event_set($watcher->eventResource, $signo, $evFlags, $this->wrapCallback($watcher));
|
|
event_base_set($watcher->eventResource, $this->base);
|
|
if ($watcher->isEnabled) {
|
|
$this->enabledWatcherCount++;
|
|
event_add($watcher->eventResource);
|
|
}
|
|
|
|
return $watcher->id;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function cancel($watcherId) {
|
|
if (empty($this->watchers[$watcherId])) {
|
|
return;
|
|
}
|
|
|
|
$watcher = $this->watchers[$watcherId];
|
|
if ($watcher->isEnabled) {
|
|
$this->enabledWatcherCount--;
|
|
}
|
|
|
|
if ($watcher->type === Watcher::IMMEDIATE) {
|
|
unset(
|
|
$this->immediates[$watcherId],
|
|
$this->watchers[$watcherId]
|
|
);
|
|
} else {
|
|
event_del($watcher->eventResource);
|
|
unset($this->watchers[$watcherId]);
|
|
}
|
|
|
|
if (PHP_MAJOR_VERSION < 7) {
|
|
$this->garbage[] = $watcher;
|
|
$this->scheduleGarbageCollection();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function disable($watcherId) {
|
|
if (empty($this->watchers[$watcherId])) {
|
|
return;
|
|
}
|
|
|
|
$watcher = $this->watchers[$watcherId];
|
|
if (!$watcher->isEnabled) {
|
|
return;
|
|
}
|
|
|
|
switch ($watcher->type) {
|
|
case Watcher::IMMEDIATE:
|
|
unset($this->immediates[$watcherId]);
|
|
break;
|
|
case Watcher::IO_READER: // fallthrough
|
|
case Watcher::IO_WRITER: // fallthrough
|
|
case Watcher::SIGNAL: // fallthrough
|
|
case Watcher::TIMER_ONCE: // fallthrough
|
|
case Watcher::TIMER_REPEAT:
|
|
event_del($watcher->eventResource);
|
|
break;
|
|
default:
|
|
throw new \RuntimeException("Unexpected Watcher type encountered");
|
|
}
|
|
|
|
$watcher->isEnabled = false;
|
|
$this->enabledWatcherCount--;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function enable($watcherId) {
|
|
if (empty($this->watchers[$watcherId])) {
|
|
return;
|
|
}
|
|
|
|
$watcher = $this->watchers[$watcherId];
|
|
if ($watcher->isEnabled) {
|
|
return;
|
|
}
|
|
|
|
switch ($watcher->type) {
|
|
case Watcher::IMMEDIATE:
|
|
$this->immediates[$watcherId] = $watcher;
|
|
break;
|
|
case Watcher::TIMER_ONCE:
|
|
event_add($watcher->eventResource, $watcher->msDelay);
|
|
break;
|
|
case Watcher::TIMER_REPEAT:
|
|
event_add($watcher->eventResource, $watcher->msInterval);
|
|
break;
|
|
case Watcher::IO_READER: // fallthrough
|
|
case Watcher::IO_WRITER: // fallthrough
|
|
case Watcher::SIGNAL:
|
|
event_add($watcher->eventResource);
|
|
break;
|
|
default:
|
|
throw new \RuntimeException("Unexpected Watcher type encountered");
|
|
}
|
|
|
|
$watcher->isEnabled = true;
|
|
$this->enabledWatcherCount++;
|
|
}
|
|
|
|
private function scheduleGarbageCollection() {
|
|
if (!$this->isGcScheduled) {
|
|
event_add($this->gcEvent, 0);
|
|
$this->isGcScheduled = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Access the underlying libevent extension event base
|
|
*
|
|
* This method exists outside the base Reactor API. It provides access to the underlying
|
|
* libevent base for code that wishes to interact with lower-level libevent extension
|
|
* functionality.
|
|
*
|
|
* @return resource
|
|
*/
|
|
public function getUnderlyingLoop() {
|
|
return $this->base;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function onError(callable $onErrorCallback) {
|
|
$this->onError = $onErrorCallback;
|
|
}
|
|
|
|
public function __destruct() {
|
|
self::$instanceCount--;
|
|
}
|
|
|
|
public function __debugInfo() {
|
|
$immediates = $timers = $readers = $writers = $signals = $disabled = 0;
|
|
foreach ($this->watchers as $watcher) {
|
|
switch ($watcher->type) {
|
|
case Watcher::IMMEDIATE:
|
|
$immediates++;
|
|
break;
|
|
case Watcher::TIMER_ONCE:
|
|
case Watcher::TIMER_REPEAT:
|
|
$timers++;
|
|
break;
|
|
case Watcher::IO_READER:
|
|
$readers++;
|
|
break;
|
|
case Watcher::IO_WRITER:
|
|
$writers++;
|
|
break;
|
|
case Watcher::SIGNAL:
|
|
$signals++;
|
|
break;
|
|
default:
|
|
throw new \DomainException(
|
|
"Unexpected watcher type: {$watcher->type}"
|
|
);
|
|
}
|
|
|
|
$disabled += !$watcher->isEnabled;
|
|
}
|
|
|
|
return [
|
|
'enabled' => $this->enabledWatcherCount,
|
|
'timers' => $timers,
|
|
'immediates' => $immediates,
|
|
'io_readers' => $readers,
|
|
'io_writers' => $writers,
|
|
'signals' => $signals,
|
|
'disabled' => $disabled,
|
|
'last_watcher_id' => $this->lastWatcherId,
|
|
'instances' => self::$instanceCount,
|
|
];
|
|
}
|
|
}
|