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<?php

namespace Socket\React\EventLoop;

use React\EventLoop\LoopInterface;

use React\EventLoop\Timer\Timer;

use React\EventLoop\Timer\TimerInterface;

use React\EventLoop\Timer\Timers;

use InvalidArgumentException;

// this is a cop-pase of React\EventLoop\StreamSelectLoop

// expect for using socket_select() instead of stream_select()

// ticket reactphp/react#191 should address this

class SocketSelectLoop implements LoopInterface

{

const QUANTUM_INTERVAL = 1000000;

private $timers;

private $running = false;

private $readStreams = array();

private $readListeners = array();

private $writeStreams = array();

private $writeListeners = array();

public function __construct()

{

$this->timers = new Timers();

}

public function addReadStream($stream, $listener)

{

$this->assertStream($stream);

$id = (int) $stream;

if (!isset($this->readStreams[$id])) {

$this->readStreams[$id] = $stream;

$this->readListeners[$id] = $listener;

}

}

public function addWriteStream($stream, $listener)

{

$this->assertStream($stream);

$id = (int) $stream;

if (!isset($this->writeStreams[$id])) {

$this->writeStreams[$id] = $stream;

$this->writeListeners[$id] = $listener;

}

}

public function removeReadStream($stream)

{

$id = (int) $stream;

unset(

$this->readStreams[$id],

$this->readListeners[$id]

);

}

public function removeWriteStream($stream)

{

$id = (int) $stream;

unset(

$this->writeStreams[$id],

$this->writeListeners[$id]

);

}

public function removeStream($stream)

{

$this->removeReadStream($stream);

$this->removeWriteStream($stream);

}

public function addTimer($interval, $callback)

{

$timer = new Timer($this, $interval, $callback, false);

$this->timers->add($timer);

return $timer;

}

public function addPeriodicTimer($interval, $callback)

{

$timer = new Timer($this, $interval, $callback, true);

$this->timers->add($timer);

return $timer;

}

public function cancelTimer(TimerInterface $timer)

{

$this->timers->cancel($timer);

}

public function isTimerActive(TimerInterface $timer)

{

return $this->timers->contains($timer);

}

protected function getNextEventTimeInMicroSeconds()

{

$nextEvent = $this->timers->getFirst();

if (null === $nextEvent) {

return self::QUANTUM_INTERVAL;

}

$currentTime = microtime(true);

if ($nextEvent > $currentTime) {

return ($nextEvent - $currentTime) * 1000000;

}

return 0;

}

protected function sleepOnPendingTimers()

{

if ($this->timers->isEmpty()) {

$this->running = false;

} else {

// We use usleep() instead of stream_select() to emulate timeouts

// since the latter fails when there are no streams registered for

// read / write events. Blame PHP for us needing this hack.

usleep($this->getNextEventTimeInMicroSeconds());

}

}

protected function runStreamSelect()

{

$read = $this->readStreams ?: null;

$write = $this->writeStreams ?: null;

$except = null;

if (!$read && !$write) {

$this->sleepOnPendingTimers();

return;

}

if (socket_select($read, $write, $except, 0, $this->getNextEventTimeInMicroSeconds()) > 0) {

if ($read) {

foreach ($read as $stream) {

$listener = $this->readListeners[(int) $stream];

call_user_func($listener, $stream, $this);

}

}

if ($write) {

foreach ($write as $stream) {

if (!isset($this->writeListeners[(int) $stream])) {

continue;

}

$listener = $this->writeListeners[(int) $stream];

call_user_func($listener, $stream, $this);

}

}

}

}

public function hasListeners()

{

return ($this->readStreams || $this->writeStreams);

}

public function tick()

{

$this->timers->tick();

$this->runStreamSelect();

return $this->running;

}

public function run()

{

$this->running = true;

while ($this->tick()) {

// NOOP

}

}

public function stop()

{

$this->running = false;

}

private function assertStream($stream)

{

static $checked = array();

$type = get_resource_type($stream);

if (is_resource($stream) && !isset($checked[$type])) {

$except = array($stream);

$null = null;

$checked[$type] = (@socket_select($null, $null, $except, 0) !== false);

}

if (!$checked[$type]) {

throw new InvalidArgumentException('Socket loop only accepts resources of type "Socket", but "' . $type .'" given');

}

}

}