mirror of
https://github.com/danog/amp.git
synced 2024-12-14 18:37:30 +01:00
478 lines
15 KiB
PHP
478 lines
15 KiB
PHP
<?php
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namespace Alert;
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class UvReactor implements SignalReactor {
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private $loop;
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private $lastWatcherId = 0;
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private $watchers;
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private $gcWatcher;
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private $gcCallback;
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private $garbage = [];
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private $isGcScheduled = false;
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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 static $MODE_ONCE = 0;
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private static $MODE_REPEAT = 1;
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private static $MODE_STREAM = 2;
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private static $MODE_SIGNAL = 3;
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private static $MODE_IMMEDIATE = 4;
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public function __construct($newLoop = false) {
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$this->loop = $newLoop ? uv_loop_new() : uv_default_loop();
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$this->gcWatcher = uv_timer_init($this->loop);
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$this->gcCallback = function() { $this->collectGarbage(); };
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$this->isWindows = (stripos(PHP_OS, 'win') === 0);
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}
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private function collectGarbage() {
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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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* Start the event reactor and assume program flow control
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*
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* @param callable $onStart Optional callback to invoke immediately upon reactor start
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* @throws \Exception Will throw if code executed during the event loop throws
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* @return void
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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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$this->immediately(function() use ($onStart) { $onStart($this); });
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}
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while ($this->isRunning) {
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if ($this->immediates && !$this->doImmediates()) {
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break;
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}
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uv_run($this->loop, \UV::RUN_NOWAIT | \UV::RUN_ONCE);
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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 => $callback) {
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$callback($this, $watcherId);
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unset(
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$this->immediates[$watcherId],
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$this->watchers[$watcherId]
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);
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if (!$this->isRunning) {
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// If a watcher stops the reactor break out of the loop
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break;
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}
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}
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return $this->isRunning;
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}
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/**
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* Execute a single event loop iteration
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*
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* @throws \Exception will throw any uncaught exception encountered during the loop iteration
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* @return void
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*/
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public function tick() {
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if ($this->isRunning) {
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return;
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}
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$this->isRunning = true;
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if (empty($this->immediates) || $this->doImmediates()) {
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uv_run($this->loop, \UV::RUN_NOWAIT | \UV::RUN_ONCE);
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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 $e;
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}
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}
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/**
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* Stop the event reactor
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*
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* @return void
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*/
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public function stop() {
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uv_stop($this->loop);
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$this->isRunning = false;
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}
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/**
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* Schedule a callback for immediate invocation in the next event loop iteration
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*
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* @param callable $callback Any valid PHP callable
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* @return int Returns a unique integer watcher ID
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*/
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public function immediately(callable $callback) {
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$watcherId = $this->lastWatcherId++;
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$this->immediates[$watcherId] = $callback;
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$watcher = new \StdClass;
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$watcher->id = $watcherId;
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$watcher->mode = self::$MODE_IMMEDIATE;
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$watcher->callback = $callback;
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$watcher->isEnabled = true;
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$this->watchers[$watcher->id] = $watcher;
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return $watcherId;
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}
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/**
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* Schedule a callback to execute once
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*
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* @param callable $callback Any valid PHP callable
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* @param int $msDelay The delay in milliseconds before the callback will trigger (may be zero)
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* @return int Returns a unique integer watcher ID
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*/
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public function once(callable $callback, $msDelay) {
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return $this->startTimer($callback, $msDelay, $msInterval = 0, self::$MODE_ONCE);
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}
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/**
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* Schedule a recurring callback to execute every $msInterval seconds until cancelled
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*
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* @param callable $callback Any valid PHP callable
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* @param int $msInterval The interval in milliseconds between callback invocations
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* @return int Returns a unique integer watcher ID
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*/
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public function repeat(callable $callback, $msInterval) {
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// A zero interval is interpreted as a "non-repeating" timer by php-uv. Here
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// we use a hack to notify on STDOUT writability for 0 interval repeating
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// callbacks because it's much more performant than churning 1ms timers.
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$msInterval = ($msInterval && $msInterval > 0) ? (int) $msInterval : -1;
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return ($msInterval === -1)
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? $this->watchStream(STDOUT, $callback, self::WATCH_WRITE | self::WATCH_NOW)
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: $this->startTimer($callback, $msInterval, $msInterval, self::$MODE_REPEAT);
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}
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private function startTimer($callback, $msDelay, $msInterval, $mode) {
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$watcher = new UvTimerWatcher;
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$watcher->id = $this->lastWatcherId++;
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$watcher->mode = $mode;
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$watcher->uvStruct = uv_timer_init($this->loop);
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$watcher->callback = $this->wrapTimerCallback($watcher, $callback);
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$watcher->msDelay = ($msDelay > 0) ? (int) $msDelay : 0;
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$watcher->msInterval = ($msInterval > 0) ? (int) $msInterval : 0;
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$watcher->isEnabled = true;
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$this->watchers[$watcher->id] = $watcher;
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uv_timer_start($watcher->uvStruct, $watcher->msDelay, $watcher->msInterval, $watcher->callback);
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return $watcher->id;
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}
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private function wrapTimerCallback($watcher, $callback) {
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return function() use ($watcher, $callback) {
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try {
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$callback($this, $watcher->id);
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if ($watcher->mode === self::$MODE_ONCE) {
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$this->clearWatcher($watcher->id);
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}
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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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/**
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* Schedule an event to trigger once at the specified time
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*
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* @param callable $callback Any valid PHP callable
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* @param mixed[int|string] $unixTimeOrStr A future unix timestamp or string parsable by strtotime()
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* @throws \InvalidArgumentException On invalid future time
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* @return int Returns a unique integer watcher ID
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*/
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public function at(callable $callback, $unixTimeOrStr) {
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$now = time();
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if (is_int($unixTimeOrStr) && $unixTimeOrStr > $now) {
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$secondsUntil = ($unixTimeOrStr - $now);
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} elseif (($executeAt = @strtotime($unixTimeOrStr)) && $executeAt > $now) {
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$secondsUntil = ($executeAt - $now);
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} else {
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throw new \InvalidArgumentException(
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'Unix timestamp or future time string (parsable by strtotime()) required'
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);
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}
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$msDelay = $secondsUntil * $this->resolution;
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return $this->once($callback, $msDelay);
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}
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/**
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* Watch a stream resource for IO readable data and trigger the callback when actionable
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*
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* @param resource $stream A stream resource to watch for readable data
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* @param callable $callback Any valid PHP callable
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* @param bool $enableNow Should the watcher be enabled now or held for later use?
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* @return int Returns a unique integer watcher ID
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*/
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public function onReadable($stream, callable $callback, $enableNow = true) {
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$flags = $enableNow ? (self::WATCH_READ | self::WATCH_NOW) : self::WATCH_READ;
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return $this->watchStream($stream, $callback, $flags);
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}
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/**
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* Watch a stream resource to become writable and trigger the callback when actionable
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*
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* @param resource $stream A stream resource to watch for writability
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* @param callable $callback Any valid PHP callable
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* @param bool $enableNow Should the watcher be enabled now or held for later use?
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* @return int Returns a unique integer watcher ID
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*/
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public function onWritable($stream, callable $callback, $enableNow = true) {
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$flags = $enableNow ? (self::WATCH_WRITE | self::WATCH_NOW) : self::WATCH_WRITE;
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return $this->watchStream($stream, $callback, $flags);
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}
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/**
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* Watch a stream resource for reads or writes (but not both) with additional option flags
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*
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* @param resource $stream
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* @param callable $callback
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* @param int $flags A bitmask of watch flags
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* @throws \DomainException if no read/write flag specified
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* @return int Returns a unique integer watcher ID
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*/
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public function watchStream($stream, callable $callback, $flags) {
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$flags = (int) $flags;
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if ($flags & self::WATCH_READ) {
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/** @noinspection PhpUndefinedClassInspection */
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$pollFlag = \UV::READABLE;
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} elseif ($flags & self::WATCH_WRITE) {
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/** @noinspection PhpUndefinedClassInspection */
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$pollFlag = \UV::WRITABLE;
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} else {
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throw new \DomainException(
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'Stream watchers must specify either a WATCH_READ or WATCH_WRITE flag'
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);
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}
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// Windows requires the socket-specific init function, so make sure we choose that
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// specifically when using tcp/ssl streams
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$pollStartFunc = $this->isWindows
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? $this->chooseWindowsPollingFunction($stream)
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: 'uv_poll_init';
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$watcherId = $this->lastWatcherId++;
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$watcher = new UvIoWatcher;
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$watcher->id = $watcherId;
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$watcher->mode = self::$MODE_STREAM;
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$watcher->stream = $stream;
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$watcher->pollFlag = $pollFlag;
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$watcher->uvStruct = $pollStartFunc($this->loop, $stream);
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$watcher->callback = $this->wrapStreamCallback($watcher, $callback);
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if ($watcher->isEnabled = ($flags & self::WATCH_NOW)) {
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uv_poll_start($watcher->uvStruct, $watcher->pollFlag, $watcher->callback);
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}
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$this->watchers[$watcherId] = $watcher;
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return $watcherId;
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}
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private function chooseWindowsPollingFunction($stream) {
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return (stream_get_meta_data($stream)['stream_type'] === 'tcp_socket/ssl')
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? 'uv_poll_init_socket'
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: 'uv_poll_init';
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}
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private function wrapStreamCallback($watcher, $callback) {
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return function() use ($watcher, $callback) {
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try {
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$callback($this, $watcher->id, $watcher->stream);
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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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/**
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* React to process control signals
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*
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* @param int $signo The signal number to watch for (e.g. 2 for Uv::SIGINT)
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* @param callable $onSignal
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* @return int Returns a unique integer watcher ID
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*/
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public function onSignal($signo, callable $onSignal) {
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$watcher = new UvSignalWatcher;
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$watcher->id = $this->lastWatcherId++;
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$watcher->mode = self::$MODE_SIGNAL;
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$watcher->signo = $signo;
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$watcher->uvStruct = uv_signal_init($this->loop);
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$watcher->callback = $this->wrapSignalCallback($watcher, $onSignal);
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$watcher->isEnabled = true;
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uv_signal_start($watcher->uvStruct, $watcher->callback, $watcher->signo);
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$this->watchers[$watcher->id] = $watcher;
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return $watcher->id;
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}
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private function wrapSignalCallback($watcher, $callback) {
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return function() use ($watcher, $callback) {
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try {
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$callback($this, $watcher->id, $watcher->signo);
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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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/**
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* Cancel an existing watcher
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*
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* @param int $watcherId
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* @return void
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*/
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public function cancel($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 ($watcher->isEnabled) {
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switch ($watcher->mode) {
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case self::$MODE_STREAM:
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uv_poll_stop($watcher->uvStruct);
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break;
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case self::$MODE_SIGNAL:
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uv_signal_stop($watcher->uvStruct);
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break;
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case self::$MODE_IMMEDIATE:
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unset($this->immediates[$watcherId]);
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break;
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default:
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uv_timer_stop($watcher->uvStruct);
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break;
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}
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}
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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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* Temporarily disable (but don't cancel) an existing timer/stream watcher
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*
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* @param int $watcherId
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* @return void
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*/
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public function disable($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->mode) {
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case self::$MODE_STREAM:
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uv_poll_stop($watcher->uvStruct);
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break;
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case self::$MODE_SIGNAL:
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uv_signal_stop($watcher->uvStruct);
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break;
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case self::$MODE_IMMEDIATE:
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unset($this->immediates[$watcher->id]);
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break;
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default:
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uv_timer_stop($watcher->uvStruct);
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break;
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}
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$watcher->isEnabled = false;
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}
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/**
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* Enable a disabled timer/stream watcher
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*
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* @param int $watcherId
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* @return void
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*/
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public function enable($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->mode) {
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case self::$MODE_STREAM:
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uv_poll_start($watcher->uvStruct, $watcher->pollFlag, $watcher->callback);
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break;
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case self::$MODE_SIGNAL:
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uv_signal_start($watcher->uvStruct, $watcher->callback, $watcher->signo);
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break;
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case self::$MODE_IMMEDIATE:
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$this->immediates[$watcher->id] = $watcher->callback;
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break;
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default:
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uv_timer_start($watcher->uvStruct, $watcher->msDelay, $watcher->msInterval, $watcher->callback);
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break;
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}
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$watcher->isEnabled = true;
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}
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/**
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* Access the underlying php-uv extension loop resource
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*
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* This method exists outside the base Reactor API. It provides access to the underlying php-uv
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* event loop resource for code that wishes to interact with lower-level php-uv 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->loop;
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}
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}
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