mirror of
https://github.com/OpenXE-org/OpenXE.git
synced 2024-12-26 22:50:29 +01:00
387 lines
9.0 KiB
PHP
387 lines
9.0 KiB
PHP
<?php
|
|
|
|
namespace Sabre\Event\Loop;
|
|
|
|
/**
|
|
* A simple eventloop implementation.
|
|
*
|
|
* This eventloop supports:
|
|
* * nextTick
|
|
* * setTimeout for delayed functions
|
|
* * setInterval for repeating functions
|
|
* * stream events using stream_select
|
|
*
|
|
* @copyright Copyright (C) 2007-2015 fruux GmbH. (https://fruux.com/)
|
|
* @author Evert Pot (http://evertpot.com/)
|
|
* @license http://sabre.io/license/ Modified BSD License
|
|
*/
|
|
class Loop {
|
|
|
|
/**
|
|
* Executes a function after x seconds.
|
|
*
|
|
* @param callable $cb
|
|
* @param float $timeout timeout in seconds
|
|
* @return void
|
|
*/
|
|
function setTimeout(callable $cb, $timeout) {
|
|
|
|
$triggerTime = microtime(true) + ($timeout);
|
|
|
|
if (!$this->timers) {
|
|
// Special case when the timers array was empty.
|
|
$this->timers[] = [$triggerTime, $cb];
|
|
return;
|
|
}
|
|
|
|
// We need to insert these values in the timers array, but the timers
|
|
// array must be in reverse-order of trigger times.
|
|
//
|
|
// So here we search the array for the insertion point.
|
|
$index = count($this->timers) - 1;
|
|
while (true) {
|
|
if ($triggerTime < $this->timers[$index][0]) {
|
|
array_splice(
|
|
$this->timers,
|
|
$index + 1,
|
|
0,
|
|
[[$triggerTime, $cb]]
|
|
);
|
|
break;
|
|
} elseif ($index === 0) {
|
|
array_unshift($this->timers, [$triggerTime, $cb]);
|
|
break;
|
|
}
|
|
$index--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Executes a function every x seconds.
|
|
*
|
|
* The value this function returns can be used to stop the interval with
|
|
* clearInterval.
|
|
*
|
|
* @param callable $cb
|
|
* @param float $timeout
|
|
* @return array
|
|
*/
|
|
function setInterval(callable $cb, $timeout) {
|
|
|
|
$keepGoing = true;
|
|
$f = null;
|
|
|
|
$f = function() use ($cb, &$f, $timeout, &$keepGoing) {
|
|
if ($keepGoing) {
|
|
$cb();
|
|
$this->setTimeout($f, $timeout);
|
|
}
|
|
};
|
|
$this->setTimeout($f, $timeout);
|
|
|
|
// Really the only thing that matters is returning the $keepGoing
|
|
// boolean value.
|
|
//
|
|
// We need to pack it in an array to allow returning by reference.
|
|
// Because I'm worried people will be confused by using a boolean as a
|
|
// sort of identifier, I added an extra string.
|
|
return ['I\'m an implementation detail', &$keepGoing];
|
|
|
|
}
|
|
|
|
/**
|
|
* Stops a running internval.
|
|
*
|
|
* @param array $intervalId
|
|
* @return void
|
|
*/
|
|
function clearInterval($intervalId) {
|
|
|
|
$intervalId[1] = false;
|
|
|
|
}
|
|
|
|
/**
|
|
* Runs a function immediately at the next iteration of the loop.
|
|
*
|
|
* @param callable $cb
|
|
* @return void
|
|
*/
|
|
function nextTick(callable $cb) {
|
|
|
|
$this->nextTick[] = $cb;
|
|
|
|
}
|
|
|
|
|
|
/**
|
|
* Adds a read stream.
|
|
*
|
|
* The callback will be called as soon as there is something to read from
|
|
* the stream.
|
|
*
|
|
* You MUST call removeReadStream after you are done with the stream, to
|
|
* prevent the eventloop from never stopping.
|
|
*
|
|
* @param resource $stream
|
|
* @param callable $cb
|
|
* @return void
|
|
*/
|
|
function addReadStream($stream, callable $cb) {
|
|
|
|
$this->readStreams[(int)$stream] = $stream;
|
|
$this->readCallbacks[(int)$stream] = $cb;
|
|
|
|
}
|
|
|
|
/**
|
|
* Adds a write stream.
|
|
*
|
|
* The callback will be called as soon as the system reports it's ready to
|
|
* receive writes on the stream.
|
|
*
|
|
* You MUST call removeWriteStream after you are done with the stream, to
|
|
* prevent the eventloop from never stopping.
|
|
*
|
|
* @param resource $stream
|
|
* @param callable $cb
|
|
* @return void
|
|
*/
|
|
function addWriteStream($stream, callable $cb) {
|
|
|
|
$this->writeStreams[(int)$stream] = $stream;
|
|
$this->writeCallbacks[(int)$stream] = $cb;
|
|
|
|
}
|
|
|
|
/**
|
|
* Stop watching a stream for reads.
|
|
*
|
|
* @param resource $stream
|
|
* @return void
|
|
*/
|
|
function removeReadStream($stream) {
|
|
|
|
unset(
|
|
$this->readStreams[(int)$stream],
|
|
$this->readCallbacks[(int)$stream]
|
|
);
|
|
|
|
}
|
|
|
|
/**
|
|
* Stop watching a stream for writes.
|
|
*
|
|
* @param resource $stream
|
|
* @return void
|
|
*/
|
|
function removeWriteStream($stream) {
|
|
|
|
unset(
|
|
$this->writeStreams[(int)$stream],
|
|
$this->writeCallbacks[(int)$stream]
|
|
);
|
|
|
|
}
|
|
|
|
|
|
/**
|
|
* Runs the loop.
|
|
*
|
|
* This function will run continiously, until there's no more events to
|
|
* handle.
|
|
*
|
|
* @return void
|
|
*/
|
|
function run() {
|
|
|
|
$this->running = true;
|
|
|
|
do {
|
|
|
|
$hasEvents = $this->tick(true);
|
|
|
|
} while ($this->running && $hasEvents);
|
|
$this->running = false;
|
|
|
|
}
|
|
|
|
/**
|
|
* Executes all pending events.
|
|
*
|
|
* If $block is turned true, this function will block until any event is
|
|
* triggered.
|
|
*
|
|
* If there are now timeouts, nextTick callbacks or events in the loop at
|
|
* all, this function will exit immediately.
|
|
*
|
|
* This function will return true if there are _any_ events left in the
|
|
* loop after the tick.
|
|
*
|
|
* @param bool $block
|
|
* @return bool
|
|
*/
|
|
function tick($block = false) {
|
|
|
|
$this->runNextTicks();
|
|
$nextTimeout = $this->runTimers();
|
|
|
|
// Calculating how long runStreams should at most wait.
|
|
if (!$block) {
|
|
// Don't wait
|
|
$streamWait = 0;
|
|
} elseif ($this->nextTick) {
|
|
// There's a pending 'nextTick'. Don't wait.
|
|
$streamWait = 0;
|
|
} elseif (is_numeric($nextTimeout)) {
|
|
// Wait until the next Timeout should trigger.
|
|
$streamWait = $nextTimeout;
|
|
} else {
|
|
// Wait indefinitely
|
|
$streamWait = null;
|
|
}
|
|
|
|
$this->runStreams($streamWait);
|
|
|
|
return ($this->readStreams || $this->writeStreams || $this->nextTick || $this->timers);
|
|
|
|
}
|
|
|
|
/**
|
|
* Stops a running eventloop
|
|
*
|
|
* @return void
|
|
*/
|
|
function stop() {
|
|
|
|
$this->running = false;
|
|
|
|
}
|
|
|
|
/**
|
|
* Executes all 'nextTick' callbacks.
|
|
*
|
|
* return void
|
|
*/
|
|
protected function runNextTicks() {
|
|
|
|
$nextTick = $this->nextTick;
|
|
$this->nextTick = [];
|
|
|
|
foreach ($nextTick as $cb) {
|
|
$cb();
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Runs all pending timers.
|
|
*
|
|
* After running the timer callbacks, this function returns the number of
|
|
* seconds until the next timer should be executed.
|
|
*
|
|
* If there's no more pending timers, this function returns null.
|
|
*
|
|
* @return float
|
|
*/
|
|
protected function runTimers() {
|
|
|
|
$now = microtime(true);
|
|
while (($timer = array_pop($this->timers)) && $timer[0] < $now) {
|
|
$timer[1]();
|
|
}
|
|
// Add the last timer back to the array.
|
|
if ($timer) {
|
|
$this->timers[] = $timer;
|
|
return $timer[0] - microtime(true);
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Runs all pending stream events.
|
|
*
|
|
* @param float $timeout
|
|
*/
|
|
protected function runStreams($timeout) {
|
|
|
|
if ($this->readStreams || $this->writeStreams) {
|
|
|
|
$read = $this->readStreams;
|
|
$write = $this->writeStreams;
|
|
$except = null;
|
|
if (stream_select($read, $write, $except, null, $timeout)) {
|
|
|
|
// See PHP Bug https://bugs.php.net/bug.php?id=62452
|
|
// Fixed in PHP7
|
|
foreach ($read as $readStream) {
|
|
$readCb = $this->readCallbacks[(int)$readStream];
|
|
$readCb();
|
|
}
|
|
foreach ($write as $writeStream) {
|
|
$writeCb = $this->writeCallbacks[(int)$writeStream];
|
|
$writeCb();
|
|
}
|
|
|
|
}
|
|
|
|
} elseif ($this->running && ($this->nextTick || $this->timers)) {
|
|
usleep($timeout !== null ? $timeout * 1000000 : 200000);
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Is the main loop active
|
|
*
|
|
* @var bool
|
|
*/
|
|
protected $running = false;
|
|
|
|
/**
|
|
* A list of timers, added by setTimeout.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $timers = [];
|
|
|
|
/**
|
|
* A list of 'nextTick' callbacks.
|
|
*
|
|
* @var callable[]
|
|
*/
|
|
protected $nextTick = [];
|
|
|
|
/**
|
|
* List of readable streams for stream_select, indexed by stream id.
|
|
*
|
|
* @var resource[]
|
|
*/
|
|
protected $readStreams = [];
|
|
|
|
/**
|
|
* List of writable streams for stream_select, indexed by stream id.
|
|
*
|
|
* @var resource[]
|
|
*/
|
|
protected $writeStreams = [];
|
|
|
|
/**
|
|
* List of read callbacks, indexed by stream id.
|
|
*
|
|
* @var callback[]
|
|
*/
|
|
protected $readCallbacks = [];
|
|
|
|
/**
|
|
* List of write callbacks, indexed by stream id.
|
|
*
|
|
* @var callback[]
|
|
*/
|
|
protected $writeCallbacks = [];
|
|
|
|
|
|
}
|