mirror of
https://github.com/danog/amp.git
synced 2024-12-12 09:29:45 +01:00
659 lines
21 KiB
PHP
659 lines
21 KiB
PHP
<?php
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namespace Amp;
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class UvReactor implements SignalReactor {
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private $loop;
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private $lastWatcherId = "a";
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private $watchers;
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private $enabledWatcherCount = 0;
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private $streamIdPollMap = [];
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private $isRunning = false;
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private $stopException;
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private $resolution = 1000;
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private $isWindows;
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private $immediates = [];
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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 $garbage;
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private $gcWatcher;
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private $gcCallback;
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private static $instanceCount = 0;
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public function __construct() {
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if (!extension_loaded('uv')) {
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throw new \RuntimeException('php-uv extension is required to use the UvReactor.');
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}
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$this->loop = uv_loop_new();
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$this->isWindows = (stripos(PHP_OS, 'win') === 0);
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/**
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* Prior to PHP7 we can't cancel closure watchers inside their own callbacks
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* because PHP will fatal. In legacy versions we schedule manual GC workarounds.
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*
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* @link https://bugs.php.net/bug.php?id=62452
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*/
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if (PHP_MAJOR_VERSION < 7) {
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$this->garbage = [];
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$this->gcWatcher = uv_timer_init($this->loop);
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$this->gcCallback = function() {
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$this->garbage = [];
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$this->isGcScheduled = false;
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};
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}
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$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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uv_run($this->loop, \UV::RUN_DEFAULT | (empty($this->immediates) ? \UV::RUN_ONCE : \UV::RUN_NOWAIT));
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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 a watcher 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) ? (\UV::RUN_NOWAIT | \UV::RUN_ONCE) : \UV::RUN_ONCE;
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uv_run($this->loop, $flags);
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}
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$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 $e;
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}
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}
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/**
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* {@inheritDoc}
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*/
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public function stop() {
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uv_stop($this->loop);
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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 = new \StdClass;
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$watcher->id = $watcherId = $this->lastWatcherId++;
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$watcher->type = Watcher::IMMEDIATE;
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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) $options["enable"] : true;
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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$this->immediates[$watcherId] = $watcher;
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}
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$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 once(callable $callback, $msDelay, array $options = []) {
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assert(($msDelay >= 0), "\$msDelay at Argument 2 expects integer >= 0");
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return $this->registerTimer($callback, $msDelay, $msInterval = -1, $options);
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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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$msDelay = isset($options["ms_delay"]) ? $options["ms_delay"] : $msInterval;
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assert(($msDelay >= 0), "ms_delay option expects integer >= 0");
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// libuv interprets a zero interval as "non-repeating." Because we support
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// zero-time repeat intervals in our other event reactors we hack in support
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// for this by assigning a 1ms interval when zero is passed by the user.
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if ($msInterval === 0) {
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$msInterval = 1;
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}
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return $this->registerTimer($callback, $msDelay, $msInterval, $options);
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}
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private function registerTimer(callable $callback, $msDelay, $msInterval, array $options) {
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$isRepeating = ($msInterval !== -1);
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$watcher = new \StdClass;
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$watcher->id = $watcherId = $this->lastWatcherId++;
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$watcher->type = ($isRepeating) ? Watcher::TIMER_REPEAT : Watcher::TIMER_ONCE;
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$watcher->uvHandle = uv_timer_init($this->loop);
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$watcher->callback = $this->wrapTimerCallback($watcher, $callback);
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$watcher->callbackData = @$options["cb_data"];
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$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
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$watcher->msDelay = $msDelay;
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$watcher->msInterval = $isRepeating ? $msInterval : 0;
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$this->watchers[$watcherId] = $watcher;
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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uv_timer_start($watcher->uvHandle, $watcher->msDelay, $watcher->msInterval, $watcher->callback);
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}
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return $watcherId;
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}
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private function wrapTimerCallback($watcher, $callback) {
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return function() use ($watcher, $callback) {
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try {
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$watcherId = $watcher->id;
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$result = call_user_func($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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// The isset() check is necessary because the "once" timer
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// callback may have cancelled itself when it was invoked.
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if ($watcher->type === Watcher::TIMER_ONCE && isset($this->watchers[$watcherId])) {
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$this->clearWatcher($watcherId);
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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 onReadable($stream, callable $callback, array $options = []) {
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return $this->watchStream($stream, $callback, Watcher::IO_READER, $options);
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}
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/**
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* {@inheritDoc}
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*/
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public function onWritable($stream, callable $callback, array $options = []) {
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return $this->watchStream($stream, $callback, Watcher::IO_WRITER, $options);
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}
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private function watchStream($stream, callable $callback, $type, array $options) {
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$watcherId = $this->lastWatcherId++;
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$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) $options["enable"] : true;
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$watcher->stream = $stream;
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$watcher->streamId = $streamId = (int) $stream;
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$watcher->poll = $poll = isset($this->streamIdPollMap[$streamId])
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? $this->streamIdPollMap[$streamId]
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: $this->makePollHandle($stream);
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$this->watchers[$watcherId] = $watcher;
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if (!$watcher->isEnabled) {
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$poll->disable[$watcherId] = $watcher;
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// If the poll is disabled we don't need to do anything else
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return $watcherId;
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}
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$this->enabledWatcherCount++;
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if ($type === Watcher::IO_READER) {
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$poll->readers[$watcherId] = $watcher;
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} else {
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$poll->writers[$watcherId] = $watcher;
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}
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$newFlags = 0;
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if ($poll->readers) {
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$newFlags |= \UV::READABLE;
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}
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if ($poll->writers) {
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$newFlags |= \UV::WRITABLE;
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}
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if ($newFlags != $poll->flags) {
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$poll->flags = $newFlags;
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uv_poll_start($poll->handle, $newFlags, $poll->callback);
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}
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return $watcherId;
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}
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private function makePollHandle($stream) {
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// Windows needs the socket-specific init function, so make sure we use
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// it when dealing with tcp/ssl streams.
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$pollInitFunc = $this->isWindows
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? $this->chooseWindowsPollingFunction($stream)
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: 'uv_poll_init';
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$streamId = (int) $stream;
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$poll = new \StdClass;
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$poll->readers = [];
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$poll->writers = [];
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$poll->disable = [];
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$poll->flags = 0;
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$poll->handle = \call_user_func($pollInitFunc, $this->loop, $stream);
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$poll->callback = function($uvHandle, $stat, $events) use ($poll) {
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if ($events & \UV::READABLE) {
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foreach ($poll->readers as $watcher) {
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$this->invokePollWatcher($watcher);
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}
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}
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if ($events & \UV::WRITABLE) {
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foreach ($poll->writers as $watcher) {
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$this->invokePollWatcher($watcher);
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}
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}
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};
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return $this->streamIdPollMap[$streamId] = $poll;
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}
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private function chooseWindowsPollingFunction($stream) {
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$streamType = stream_get_meta_data($stream)['stream_type'];
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return ($streamType === 'tcp_socket/ssl' || $streamType === 'tcp_socket')
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? 'uv_poll_init_socket'
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: 'uv_poll_init';
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}
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private function invokePollWatcher($watcher) {
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try {
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$result = call_user_func($watcher->callback, $this, $watcher->id, $watcher->stream, $watcher->callbackData);
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if ($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($e);
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}
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}
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/**
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* {@inheritDoc}
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*/
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public function onSignal($signo, callable $func, array $options = []) {
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$watcher = new \StdClass;
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$watcher->id = $watcherId = $this->lastWatcherId++;
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$watcher->type = Watcher::SIGNAL;
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$watcher->callback = $this->wrapSignalCallback($watcher, $func);
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$watcher->callbackData = @$options["cb_data"];
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$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
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$watcher->signo = $signo;
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$watcher->uvHandle = uv_signal_init($this->loop);
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount++;
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uv_signal_start($watcher->uvHandle, $watcher->callback, $watcher->signo);
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}
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$this->watchers[$watcherId] = $watcher;
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return $watcherId;
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}
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private function wrapSignalCallback($watcher, $callback) {
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return function() use ($watcher, $callback) {
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try {
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$result = call_user_func($callback, $this, $watcher->id, $watcher->signo, $watcher->callbackData);
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if ($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($e);
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}
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};
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}
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/**
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* {@inheritDoc}
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*/
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public function cancel($watcherId) {
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if (isset($this->watchers[$watcherId])) {
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$this->clearWatcher($watcherId);
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}
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}
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private function clearWatcher($watcherId) {
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$watcher = $this->watchers[$watcherId];
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unset($this->watchers[$watcherId]);
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if ($watcher->isEnabled) {
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$this->enabledWatcherCount--;
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switch ($watcher->type) {
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case Watcher::IO_READER:
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// fallthrough
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case Watcher::IO_WRITER:
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$this->clearPollFromWatcher($watcher);
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break;
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case Watcher::SIGNAL:
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uv_signal_stop($watcher->uvHandle);
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break;
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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::TIMER_ONCE:
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// we don't have to actually stop once timers
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break;
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default:
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uv_timer_stop($watcher->uvHandle);
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break;
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}
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}
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if (PHP_MAJOR_VERSION < 7) {
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$this->garbage[] = $watcher;
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if (!$this->isGcScheduled) {
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uv_timer_start($this->gcWatcher, 250, 0, $this->gcCallback);
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$this->isGcScheduled = true;
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}
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}
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}
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private function clearPollFromWatcher($watcher) {
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$poll = $watcher->poll;
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$watcherId = $watcher->id;
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unset(
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$poll->readers[$watcherId],
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$poll->writers[$watcherId],
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$poll->disable[$watcherId]
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);
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// If any watchers are still enabled for this stream we're finished here
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$hasEnabledWatchers = ((int) $poll->readers) + ((int) $poll->writers);
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if ($hasEnabledWatchers) {
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return;
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}
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// Always stop polling if no enabled watchers remain
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uv_poll_stop($poll->handle);
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// If all watchers are disabled we can pull out here
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$hasDisabledWatchers = (bool) $poll->disable;
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if ($hasDisabledWatchers) {
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return;
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}
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// Otherwise there are no watchers left for this poll and we should clear it
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$streamId = (int) $watcher->stream;
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unset($this->streamIdPollMap[$streamId]);
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}
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/**
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* {@inheritDoc}
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*/
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public function disable($watcherId) {
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if (!isset($this->watchers[$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::IO_READER:
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// fallthrough
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case Watcher::IO_WRITER:
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$this->disablePollFromWatcher($watcher);
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break;
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case Watcher::SIGNAL:
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uv_signal_stop($watcher->uvHandle);
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break;
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case Watcher::IMMEDIATE:
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unset($this->immediates[$watcherId]);
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break;
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case Watcher::TIMER_ONCE:
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// fallthrough
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case Watcher::TIMER_REPEAT:
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uv_timer_stop($watcher->uvHandle);
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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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private function disablePollFromWatcher($watcher) {
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$poll = $watcher->poll;
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$watcherId = $watcher->id;
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unset(
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$poll->readers[$watcherId],
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$poll->writers[$watcherId]
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);
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$poll->disable[$watcherId] = $watcher;
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if (!($poll->readers || $poll->writers)) {
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uv_poll_stop($poll->handle);
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return;
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}
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// If we're still here we may need to update the polling flags
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$newFlags = 0;
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if ($poll->readers) {
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$newFlags |= \UV::READABLE;
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}
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if ($poll->writers) {
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$newFlags |= \UV::WRITABLE;
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}
|
|
if ($poll->flags != $newFlags) {
|
|
$poll->flags = $newFlags;
|
|
uv_poll_start($poll->handle, $newFlags, $poll->callback);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function enable($watcherId) {
|
|
if (!isset($this->watchers[$watcherId])) {
|
|
return;
|
|
}
|
|
|
|
$watcher = $this->watchers[$watcherId];
|
|
if ($watcher->isEnabled) {
|
|
return;
|
|
}
|
|
|
|
switch ($watcher->type) {
|
|
case Watcher::TIMER_ONCE: // fallthrough
|
|
case Watcher::TIMER_REPEAT:
|
|
uv_timer_start($watcher->uvHandle, $watcher->msDelay, $watcher->msInterval, $watcher->callback);
|
|
break;
|
|
case Watcher::IO_READER: // fallthrough
|
|
case Watcher::IO_WRITER:
|
|
$this->enablePollFromWatcher($watcher);
|
|
break;
|
|
case Watcher::SIGNAL:
|
|
uv_signal_start($watcher->uvHandle, $watcher->callback, $watcher->signo);
|
|
break;
|
|
case Watcher::IMMEDIATE:
|
|
$this->immediates[$watcherId] = $watcher;
|
|
break;
|
|
default:
|
|
throw new \RuntimeException("Unexpected Watcher type encountered");
|
|
}
|
|
|
|
$watcher->isEnabled = true;
|
|
$this->enabledWatcherCount++;
|
|
}
|
|
|
|
private function enablePollFromWatcher($watcher) {
|
|
$poll = $watcher->poll;
|
|
$watcherId = $watcher->id;
|
|
|
|
unset($poll->disable[$watcherId]);
|
|
|
|
if ($watcher->type === Watcher::IO_READER) {
|
|
$poll->flags |= \UV::READABLE;
|
|
$poll->readers[$watcherId] = $watcher;
|
|
} else {
|
|
$poll->flags |= \UV::WRITABLE;
|
|
$poll->writers[$watcherId] = $watcher;
|
|
}
|
|
|
|
@uv_poll_start($poll->handle, $poll->flags, $poll->callback);
|
|
}
|
|
|
|
/**
|
|
* Access the underlying php-uv extension loop resource
|
|
*
|
|
* This method exists outside the base Reactor API. It provides access to the underlying php-uv
|
|
* event loop resource for code that wishes to interact with lower-level php-uv extension
|
|
* functionality.
|
|
*
|
|
* @return resource
|
|
*/
|
|
public function getUnderlyingLoop() {
|
|
return $this->loop;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function onError(callable $func) {
|
|
$this->onError = $func;
|
|
}
|
|
|
|
public function __destruct() {
|
|
self::$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 [
|
|
'timers' => $timers,
|
|
'immediates' => $immediates,
|
|
'io_readers' => $readers,
|
|
'io_writers' => $writers,
|
|
'signals' => $signals,
|
|
'disabled' => $disabled,
|
|
'last_watcher_id' => $this->lastWatcherId,
|
|
'instances' => self::$instanceCount,
|
|
];
|
|
}
|
|
}
|