ok
Mini Shell
<?php
namespace Amp\Loop;
use Amp\Coroutine;
use Amp\Promise;
use React\Promise\PromiseInterface as ReactPromise;
use function Amp\Promise\rethrow;
class UvDriver extends Driver
{
/** @var resource A uv_loop resource created with uv_loop_new() */
private $handle;
/** @var resource[] */
private $events = [];
/** @var Watcher[][] */
private $watchers = [];
/** @var resource[] */
private $streams = [];
/** @var callable */
private $ioCallback;
/** @var callable */
private $timerCallback;
/** @var callable */
private $signalCallback;
public function __construct()
{
$this->handle = \uv_loop_new();
/**
* @param $event
* @param $status
* @param $events
* @param $resource
*
* @return void
*/
$this->ioCallback = function ($event, $status, $events, $resource) {
$watchers = $this->watchers[(int) $event];
switch ($status) {
case 0: // OK
break;
default: // Invoke the callback on errors, as this matches behavior with other loop back-ends.
// Re-enable watcher as libuv disables the watcher on non-zero status.
$flags = 0;
foreach ($watchers as $watcher) {
$flags |= $watcher->enabled ? $watcher->type : 0;
}
\uv_poll_start($event, $flags, $this->ioCallback);
break;
}
foreach ($watchers as $watcher) {
// $events is OR'ed with 4 to trigger watcher if no events are indicated (0) or on UV_DISCONNECT (4).
// http://docs.libuv.org/en/v1.x/poll.html
if (!($watcher->enabled && ($watcher->type & $events || ($events | 4) === 4))) {
continue;
}
try {
$result = ($watcher->callback)($watcher->id, $resource, $watcher->data);
if ($result === null) {
continue;
}
if ($result instanceof \Generator) {
$result = new Coroutine($result);
}
if ($result instanceof Promise || $result instanceof ReactPromise) {
rethrow($result);
}
} catch (\Throwable $exception) {
$this->error($exception);
}
}
};
/**
* @param $event
*
* @return void
*/
$this->timerCallback = function ($event) {
$watcher = $this->watchers[(int) $event][0];
if ($watcher->type & Watcher::DELAY) {
unset($this->events[$watcher->id], $this->watchers[(int) $event]); // Avoid call to uv_is_active().
$this->cancel($watcher->id); // Remove reference to watcher in parent.
} elseif ($watcher->value === 0) {
// Disable and re-enable so it's not executed repeatedly in the same tick
// See https://github.com/amphp/amp/issues/131
$this->disable($watcher->id);
$this->enable($watcher->id);
}
try {
$result = ($watcher->callback)($watcher->id, $watcher->data);
if ($result === null) {
return;
}
if ($result instanceof \Generator) {
$result = new Coroutine($result);
}
if ($result instanceof Promise || $result instanceof ReactPromise) {
rethrow($result);
}
} catch (\Throwable $exception) {
$this->error($exception);
}
};
/**
* @param $event
* @param $signo
*
* @return void
*/
$this->signalCallback = function ($event, $signo) {
$watcher = $this->watchers[(int) $event][0];
try {
$result = ($watcher->callback)($watcher->id, $signo, $watcher->data);
if ($result === null) {
return;
}
if ($result instanceof \Generator) {
$result = new Coroutine($result);
}
if ($result instanceof Promise || $result instanceof ReactPromise) {
rethrow($result);
}
} catch (\Throwable $exception) {
$this->error($exception);
}
};
}
/**
* {@inheritdoc}
*/
public function cancel(string $watcherId)
{
parent::cancel($watcherId);
if (!isset($this->events[$watcherId])) {
return;
}
$event = $this->events[$watcherId];
$eventId = (int) $event;
if (isset($this->watchers[$eventId][0])) { // All except IO watchers.
unset($this->watchers[$eventId]);
} elseif (isset($this->watchers[$eventId][$watcherId])) {
$watcher = $this->watchers[$eventId][$watcherId];
unset($this->watchers[$eventId][$watcherId]);
if (empty($this->watchers[$eventId])) {
unset($this->watchers[$eventId], $this->streams[(int) $watcher->value]);
}
}
unset($this->events[$watcherId]);
}
public static function isSupported(): bool
{
return \extension_loaded("uv");
}
/**
* {@inheritdoc}
*/
public function now(): int
{
\uv_update_time($this->handle);
/** @psalm-suppress TooManyArguments */
return \uv_now($this->handle);
}
/**
* {@inheritdoc}
*/
public function getHandle()
{
return $this->handle;
}
/**
* {@inheritdoc}
*
* @return void
*/
protected function dispatch(bool $blocking)
{
/** @psalm-suppress TooManyArguments */
\uv_run($this->handle, $blocking ? \UV::RUN_ONCE : \UV::RUN_NOWAIT);
}
/**
* {@inheritdoc}
*
* @return void
*/
protected function activate(array $watchers)
{
$now = $this->now();
foreach ($watchers as $watcher) {
$id = $watcher->id;
switch ($watcher->type) {
case Watcher::READABLE:
case Watcher::WRITABLE:
\assert(\is_resource($watcher->value));
$streamId = (int) $watcher->value;
if (isset($this->streams[$streamId])) {
$event = $this->streams[$streamId];
} elseif (isset($this->events[$id])) {
$event = $this->streams[$streamId] = $this->events[$id];
} else {
/** @psalm-suppress UndefinedFunction */
$event = $this->streams[$streamId] = \uv_poll_init_socket($this->handle, $watcher->value);
}
$eventId = (int) $event;
$this->events[$id] = $event;
$this->watchers[$eventId][$id] = $watcher;
$flags = 0;
foreach ($this->watchers[$eventId] as $w) {
$flags |= $w->enabled ? $w->type : 0;
}
\uv_poll_start($event, $flags, $this->ioCallback);
break;
case Watcher::DELAY:
case Watcher::REPEAT:
\assert(\is_int($watcher->value));
if (isset($this->events[$id])) {
$event = $this->events[$id];
} else {
$event = $this->events[$id] = \uv_timer_init($this->handle);
}
$this->watchers[(int) $event] = [$watcher];
\uv_timer_start(
$event,
\max(0, $watcher->expiration - $now),
($watcher->type & Watcher::REPEAT) ? $watcher->value : 0,
$this->timerCallback
);
break;
case Watcher::SIGNAL:
\assert(\is_int($watcher->value));
if (isset($this->events[$id])) {
$event = $this->events[$id];
} else {
/** @psalm-suppress UndefinedFunction */
$event = $this->events[$id] = \uv_signal_init($this->handle);
}
$this->watchers[(int) $event] = [$watcher];
/** @psalm-suppress UndefinedFunction */
\uv_signal_start($event, $this->signalCallback, $watcher->value);
break;
default:
// @codeCoverageIgnoreStart
throw new \Error("Unknown watcher type");
// @codeCoverageIgnoreEnd
}
}
}
/**
* {@inheritdoc}
*
* @return void
*/
protected function deactivate(Watcher $watcher)
{
$id = $watcher->id;
if (!isset($this->events[$id])) {
return;
}
$event = $this->events[$id];
if (!\uv_is_active($event)) {
return;
}
switch ($watcher->type) {
case Watcher::READABLE:
case Watcher::WRITABLE:
$flags = 0;
foreach ($this->watchers[(int) $event] as $w) {
$flags |= $w->enabled ? $w->type : 0;
}
if ($flags) {
\uv_poll_start($event, $flags, $this->ioCallback);
} else {
\uv_poll_stop($event);
}
break;
case Watcher::DELAY:
case Watcher::REPEAT:
\uv_timer_stop($event);
break;
case Watcher::SIGNAL:
\uv_signal_stop($event);
break;
default:
// @codeCoverageIgnoreStart
throw new \Error("Unknown watcher type");
// @codeCoverageIgnoreEnd
}
}
}
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