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mirror of https://github.com/danog/amp.git synced 2024-12-13 09:57:25 +01:00
amp/lib/NativeReactor.php
2016-05-12 14:54:59 +02:00

660 lines
23 KiB
PHP

<?php
namespace Amp;
class NativeReactor implements Reactor {
use Struct;
private $watchers = [];
private $immediates = [];
private $timerOrder = [];
private $readStreams = [];
private $writeStreams = [];
private $readWatchers = [];
private $writeWatchers = [];
private $timersEnabled = false;
private $isTimerSortNeeded = false;
private $state = self::STOPPED;
private $onCoroutineResolution;
private $hasExtPcntl;
private $signalState;
private $signalHandler;
private $keepAliveCount = 0;
public function __construct() {
$this->hasExtPcntl = \extension_loaded("pcntl");
$this->signalState = $signalState = new \StdClass;
$this->signalState->shouldDispatch = false;
$this->signalState->handlers = [];
$this->signalHandler = static function($signo) use ($signalState) {
if (empty($signalState->handlers[$signo])) {
return;
}
foreach ($signalState->handlers[$signo] as $watcherId => $watcher) {
$out = \call_user_func($watcher->callback, $watcherId, $signo, $watcher->cbData);
if ($out instanceof \Generator) {
resolve($out)->when($this->onCoroutineResolution);
}
}
};
$this->onCoroutineResolution = static function ($error = null, $result = null) {
if ($error) {
throw $error;
}
};
}
/**
* {@inheritDoc}
*/
public function run(callable $onStart = null) {
if ($this->state !== self::STOPPED) {
throw new \LogicException(
"Cannot run() recursively; event reactor already active"
);
}
if ($onStart) {
$this->state = self::STARTING;
$watcherId = $this->immediately($onStart);
if (!$this->tryImmediate($this->watchers[$watcherId]) || empty($this->keepAliveCount)) {
$this->state = self::STOPPED;
return;
}
} else {
$this->state = self::RUNNING;
}
$this->enableTimers();
while ($this->state > self::STOPPED) {
$this->doTick($noWait = false);
if (empty($this->keepAliveCount)) {
break;
}
}
\gc_collect_cycles();
$this->timersEnabled = false;
$this->state = self::STOPPED;
}
private function unload() {
if ($this->watchers) {
foreach (\array_keys($this->watchers) as $watcherId) {
$this->cancel($watcherId);
}
}
$this->timersEnabled = false;
$this->state = self::STOPPED;
}
private function tryImmediate($watcher) {
try {
unset(
$this->watchers[$watcher->id],
$this->immediates[$watcher->id]
);
$this->keepAliveCount -= $watcher->keepAlive;
$out = \call_user_func($watcher->callback, $watcher->id, $watcher->cbData);
if ($out instanceof \Generator) {
resolve($out)->when($this->onCoroutineResolution);
}
} catch (\Throwable $e) {
// @TODO Remove coverage ignore block once PHP5 support is no longer required
// @codeCoverageIgnoreStart
\call_user_func($this->onCoroutineResolution, $e);
// @codeCoverageIgnoreEnd
} catch (\Exception $e) {
// @TODO Remove this catch block once PHP5 support is no longer required
\call_user_func($this->onCoroutineResolution, $e);
}
return $this->state;
}
private function enableTimers() {
$now = \microtime(true);
foreach ($this->watchers as $watcherId => $watcher) {
if (!($watcher->type & Watcher::TIMER) || isset($watcher->nextExecutionAt) || !$watcher->isEnabled) {
continue;
}
$watcher->nextExecutionAt = $now + $watcher->msDelay;
$this->timerOrder[$watcherId] = $watcher->nextExecutionAt;
}
$this->timersEnabled = true;
$this->isTimerSortNeeded = true;
}
/**
* {@inheritDoc}
*/
public function stop() {
if ($this->state !== self::STOPPED) {
$this->state = self::STOPPED;
$this->timersEnabled = false;
} else {
throw new \LogicException(
"Cannot stop(); event reactor not currently active"
);
}
}
/**
* {@inheritDoc}
*/
public function tick($noWait = false) {
if ($this->state) {
throw new \LogicException(
"Cannot tick() recursively; event reactor already active"
);
}
try {
$this->state = self::TICKING;
$this->doTick((bool) $noWait);
$this->state = self::STOPPED;
} catch (\Throwable $e) {
throw $e;
} catch (\Exception $e) {
throw $e;
}
}
private function doTick($noWait) {
if (empty($this->timersEnabled)) {
$this->enableTimers();
}
$immediates = $this->immediates;
foreach ($immediates as $watcher) {
if (!$this->tryImmediate($watcher)) {
break;
}
}
if ($this->signalState->shouldDispatch) {
\pcntl_signal_dispatch();
}
// If an immediately watcher called stop() we pull out here
if ($this->state <= self::STOPPED) {
return;
}
if ($this->immediates || $noWait) {
$timeToNextAlarm = 0;
} elseif (empty($this->timerOrder)) {
$timeToNextAlarm = null;
} else {
if ($this->isTimerSortNeeded) {
\asort($this->timerOrder);
$this->isTimerSortNeeded = false;
}
// Don't block the run() loop if no keep-alive timers exist
// @TODO Instead of iterating all timers hunting for a keep-alive
// we should just use a specific counter to cache the number
// of keep-alive timers in use at any given time
$timeToNextAlarm = null;
foreach ($this->timerOrder as $watcherId => $time) {
if ($this->watchers[$watcherId]->keepAlive) {
// The reset() is important because the foreach modifies
// the internal array pointer with PHP 5.
$nextTimerAt = \reset($this->timerOrder);
$timeToNextAlarm = \round($nextTimerAt - \microtime(true), 4);
break;
}
}
}
if (empty($this->keepAliveCount)) {
return;
} elseif ($this->readStreams || $this->writeStreams) {
$this->selectActionableStreams($timeToNextAlarm);
} elseif (!($this->timerOrder || $this->immediates || $this->signalState->handlers)) {
$this->stop();
} elseif ($timeToNextAlarm > 0) {
\usleep($timeToNextAlarm * 1000000);
}
if ($this->timerOrder || $this->immediates) {
$this->executeTimers();
}
}
private function selectActionableStreams($timeout) {
$r = $this->readStreams;
$w = $this->writeStreams;
$e = null;
if ($timeout === null) {
$sec = null;
$usec = null;
} elseif ($timeout <= 0) {
$sec = 0;
$usec = 0;
} else {
$sec = floor($timeout);
$usec = ($timeout - $sec) * 1000000;
}
if (!@stream_select($r, $w, $e, $sec, $usec)) {
return;
}
// check for if (!empty($watchers[$streamId])) as they may have been removed during another callback
foreach ($r as $stream) {
$streamId = (int) $stream;
if (!empty($this->readWatchers[$streamId])) {
foreach ($this->readWatchers[$streamId] as $watcherId => $watcher) {
$this->doIoCallback($watcherId, $watcher, $stream);
}
}
}
foreach ($w as $stream) {
$streamId = (int) $stream;
if (!empty($this->writeWatchers[$streamId])) {
foreach ($this->writeWatchers[$streamId] as $watcherId => $watcher) {
$this->doIoCallback($watcherId, $watcher, $stream);
}
}
}
}
private function doIoCallback($watcherId, $watcher, $stream) {
try {
$result = \call_user_func($watcher->callback, $watcherId, $stream, $watcher->cbData);
if ($result instanceof \Generator) {
resolve($result)->when($this->onCoroutineResolution);
}
} catch (\Throwable $e) {
\call_user_func($this->onCoroutineResolution, $e);
} catch (\Exception $e) {
\call_user_func($this->onCoroutineResolution, $e);
}
}
private function executeTimers() {
$now = \microtime(true);
if ($this->isTimerSortNeeded) {
\asort($this->timerOrder);
$this->isTimerSortNeeded = false;
}
foreach ($this->timerOrder as $watcherId => $executionCutoff) {
if ($executionCutoff > $now) {
break;
}
if (!isset($this->watchers[$watcherId])) {
unset($this->timerOrder[$watcherId]);
continue;
}
$watcher = $this->watchers[$watcherId];
$result = \call_user_func($watcher->callback, $watcherId, $watcher->cbData);
if ($result instanceof \Generator) {
resolve($result)->when($this->onCoroutineResolution);
}
if (!isset($this->watchers[$watcherId])) {
// This check is necessary as the watcher may have been disabled during callback invocation
} elseif ($watcher->type === Watcher::TIMER_ONCE) {
$this->keepAliveCount -= $watcher->keepAlive;
unset(
$this->watchers[$watcherId],
$this->timerOrder[$watcherId]
);
} elseif ($watcher->isEnabled) {
$this->isTimerSortNeeded = true;
$watcher->nextExecutionAt = $now + $watcher->msInterval;
$this->timerOrder[$watcherId] = $watcher->nextExecutionAt;
} else {
unset($this->timerOrder[$watcherId]);
}
}
}
/**
* {@inheritDoc}
*/
public function immediately(callable $callback, array $options = []) {
$watcher = new \StdClass;
$watcher->id = $watcherId = \spl_object_hash($watcher);
$watcher->type = Watcher::IMMEDIATE;
$watcher->callback = $callback;
$watcher->cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
if ($watcher->isEnabled) {
$this->watchers[$watcherId] = $this->immediates[$watcherId] = $watcher;
$this->keepAliveCount += $watcher->keepAlive;
}
return $watcherId;
}
/**
* {@inheritDoc}
*/
public function once(callable $callback, $msDelay, array $options = []) {
$msDelay = (int) $msDelay;
assert(($msDelay >= 0), "\$msDelay at Argument 2 expects integer >= 0");
/* In the php7 branch we use an anonymous class with Struct for this.
* Using a stdclass isn't terribly readable and it's prone to error but
* it's the easiest way to minimize the distance between 5.x and 7 code
* and keep maintenance simple.
*/
$watcher = new \StdClass;
$watcher->id = $watcherId = \spl_object_hash($watcher);
$watcher->type = Watcher::TIMER_ONCE;
$watcher->callback = $callback;
$watcher->cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
$watcher->msDelay = \round(($msDelay / 1000), 3);
$watcher->nextExecutionAt = null;
$this->keepAliveCount += ($watcher->keepAlive && $watcher->isEnabled);
if ($watcher->isEnabled && $this->state > self::STOPPED) {
$nextExecutionAt = \microtime(true) + $watcher->msDelay;
$watcher->nextExecutionAt = $nextExecutionAt;
$this->timerOrder[$watcherId] = $nextExecutionAt;
$this->isTimerSortNeeded = true;
}
$this->watchers[$watcherId] = $watcher;
return $watcherId;
}
/**
* {@inheritDoc}
*/
public function repeat(callable $callback, $msInterval, array $options = []) {
$msInterval = (int) $msInterval;
assert(($msInterval >= 0), "\$msInterval at Argument 2 expects integer >= 0");
$msDelay = isset($options["ms_delay"]) ? $options["ms_delay"] : (int) $msInterval;
assert(($msDelay >= 0), "ms_delay option expects integer >= 0");
/* In the php7 branch we use an anonymous class with Struct for this.
* Using a stdclass isn't terribly readable and it's prone to error but
* it's the easiest way to minimize the distance between 5.x and 7 code
* and keep maintenance simple.
*/
$watcher = new \StdClass;
$watcher->id = $watcherId = \spl_object_hash($watcher);
$watcher->type = Watcher::TIMER_REPEAT;
$watcher->callback = $callback;
$watcher->cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
$watcher->msInterval = round(($msInterval / 1000), 3);
$watcher->msDelay = round(($msDelay / 1000), 3);
$watcher->nextExecutionAt = null; // only needed for php5.x
$this->keepAliveCount += ($watcher->keepAlive && $watcher->isEnabled);
if ($watcher->isEnabled && $this->state > self::STOPPED) {
$increment = (isset($watcher->msDelay) ? $watcher->msDelay : $watcher->msInterval);
$nextExecutionAt = microtime(true) + $increment;
$this->timerOrder[$watcherId] = $watcher->nextExecutionAt = $nextExecutionAt;
$this->isTimerSortNeeded = true;
}
$this->watchers[$watcherId] = $watcher;
return $watcherId;
}
/**
* {@inheritDoc}
*/
public function onReadable($stream, callable $callback, array $options = []) {
return $this->registerIoWatcher($stream, $callback, $options, Watcher::IO_READER);
}
/**
* {@inheritDoc}
*/
public function onWritable($stream, callable $callback, array $options = []) {
return $this->registerIoWatcher($stream, $callback, $options, Watcher::IO_WRITER);
}
private function registerIoWatcher($stream, $callback, $options, $type) {
/* In the php7 branch we use an anonymous class with Struct for this.
* Using a stdclass isn't terribly readable and it's prone to error but
* it's the easiest way to minimize the distance between 5.x and 7 code
* and keep maintenance simple.
*/
$watcher = new \StdClass;
$watcher->id = $watcherId = \spl_object_hash($watcher);
$watcher->type = $type;
$watcher->callback = $callback;
$watcher->cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
$watcher->stream = $stream;
$watcher->streamId = $streamId = (int) $stream;
if ($watcher->isEnabled) {
$this->keepAliveCount += $watcher->keepAlive;
if ($type === Watcher::IO_READER) {
$this->readStreams[$streamId] = $stream;
$this->readWatchers[$streamId][$watcherId] = $watcher;
} else {
$this->writeStreams[$streamId] = $stream;
$this->writeWatchers[$streamId][$watcherId] = $watcher;
}
}
$this->watchers[$watcherId] = $watcher;
return $watcherId;
}
/**
* {@inheritDoc}
* @throws \RuntimeException if ext/pcntl unavailable or signal handler registration fails
*/
public function onSignal($signo, callable $func, array $options = []) {
if (empty($this->hasExtPcntl)) {
throw new \RuntimeException(
"Cannot react to signals; ext/pcntl not loaded"
);
}
$signo = (int) $signo;
$watcher = new \StdClass;
$watcher->id = $watcherId = \spl_object_hash($watcher);
$watcher->type = Watcher::SIGNAL;
$watcher->callback = $func;
$watcher->cbData = isset($options["cb_data"]) ? $options["cb_data"] : null;
$watcher->isEnabled = isset($options["enable"]) ? (bool) $options["enable"] : true;
$watcher->keepAlive = isset($options["keep_alive"]) ? (bool) $options["keep_alive"] : true;
$watcher->signo = $signo;
if ($watcher->isEnabled) {
if (empty($this->signalState->handlers[$signo]) && !@\pcntl_signal($signo, $this->signalHandler)) {
throw new \RuntimeException(
"Failed registering signal handler"
);
}
$this->signalState->shouldDispatch = true;
$this->signalState->handlers[$signo][$watcherId] = $watcher;
$this->keepAliveCount += $watcher->keepAlive;
}
$this->watchers[$watcherId] = $watcher;
return $watcherId;
}
/**
* {@inheritDoc}
*/
public function onError(callable $func) {
$this->onCoroutineResolution = static function($e = null, $r = null) use ($func) {
if ($e) {
\call_user_func($func, $e);
}
};
}
/**
* {@inheritDoc}
*/
public function cancel($watcherId) {
$this->disable($watcherId);
unset(
$this->watchers[$watcherId],
$this->timerOrder[$watcherId]
);
}
/**
* {@inheritDoc}
*/
public function enable($watcherId) {
if (!isset($this->watchers[$watcherId])) {
return;
}
$watcher = $this->watchers[$watcherId];
if ($watcher->isEnabled) {
// If the watcher is already enabled we're finished here
return;
}
$watcher->isEnabled = true;
$this->keepAliveCount += $watcher->keepAlive;
switch ($watcher->type) {
case Watcher::TIMER_ONCE:
case Watcher::TIMER_REPEAT:
if (!isset($watcher->nextExecutionAt)) {
$watcher->nextExecutionAt = \microtime(true) + $watcher->msDelay;
}
$this->isTimerSortNeeded = true;
$this->timerOrder[$watcherId] = $watcher->nextExecutionAt;
break;
case Watcher::IO_READER:
$streamId = (int) $watcher->stream;
$this->readStreams[$streamId] = $watcher->stream;
$this->readWatchers[$streamId][$watcherId] = $watcher;
break;
case Watcher::IO_WRITER:
$streamId = (int) $watcher->stream;
$this->writeStreams[$streamId] = $watcher->stream;
$this->writeWatchers[$streamId][$watcherId] = $watcher;
break;
case Watcher::IMMEDIATE:
$this->immediates[$watcherId] = $watcher;
break;
case Watcher::SIGNAL:
$signo = $watcher->signo;
if (empty($this->signalState->handlers[$signo])) {
\pcntl_signal($signo, $this->signalHandler);
}
$this->signalState->handlers[$signo][$watcherId] = $watcher;
$this->signalState->shouldDispatch = true;
break;
}
}
/**
* {@inheritDoc}
*/
public function disable($watcherId) {
if (!isset($this->watchers[$watcherId])) {
return;
}
$watcher = $this->watchers[$watcherId];
if (!$watcher->isEnabled) {
return;
}
$watcher->isEnabled = false;
$this->keepAliveCount -= $watcher->keepAlive;
switch ($watcher->type) {
case Watcher::TIMER_ONCE:
case Watcher::TIMER_REPEAT:
unset($this->timerOrder[$watcherId]);
break;
case Watcher::IO_READER:
$streamId = $watcher->streamId;
unset($this->readWatchers[$streamId][$watcherId]);
if (empty($this->readWatchers[$streamId])) {
unset($this->readWatchers[$streamId], $this->readStreams[$streamId]);
}
break;
case Watcher::IO_WRITER:
$streamId = $watcher->streamId;
unset($this->writeWatchers[$streamId][$watcherId]);
if (empty($this->writeWatchers[$streamId])) {
unset($this->writeWatchers[$streamId], $this->writeStreams[$streamId]);
}
break;
case Watcher::IMMEDIATE:
unset($this->immediates[$watcherId]);
break;
case Watcher::SIGNAL:
$signo = $watcher->signo;
unset($this->signalState->handlers[$signo][$watcherId]);
if (empty($this->signalState->handlers[$signo])) {
unset($this->signalState->handlers[$signo]);
\pcntl_signal($signo, \SIG_DFL);
if (empty($this->signalState->handlers)) {
$this->signalState->shouldDispatch = false;
}
}
break;
}
}
/**
* {@inheritDoc}
*/
public function info() {
$once = $repeat = $immediately = $onReadable = $onWritable = $onSignal = [
"enabled" => 0,
"disabled" => 0,
];
foreach ($this->watchers as $watcher) {
switch ($watcher->type) {
case Watcher::IMMEDIATE: $arr =& $immediately; break;
case Watcher::TIMER_ONCE: $arr =& $once; break;
case Watcher::TIMER_REPEAT: $arr =& $repeat; break;
case Watcher::IO_READER: $arr =& $onReadable; break;
case Watcher::IO_WRITER: $arr =& $onWritable; break;
case Watcher::SIGNAL: $arr =& $onSignal; break;
}
if ($watcher->isEnabled) {
$arr["enabled"] += 1;
} else {
$arr["disabled"] += 1;
}
}
return [
"immediately" => $immediately,
"once" => $once,
"repeat" => $repeat,
"on_readable" => $onReadable,
"on_writable" => $onWritable,
"on_signal" => $onSignal,
"keep_alive" => $this->keepAliveCount,
"state" => $this->state,
];
}
public function __debugInfo() {
return $this->info();
}
}