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<?php |
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namespace Helix\Socket; |
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use Countable; |
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use Helix\Socket\WebSocket\WebSocketClient; |
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use Helix\Socket\WebSocket\WebSocketError; |
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use Throwable; |
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/** |
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* Selects and calls reactive sockets when they are readable. |
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*/ |
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class Reactor implements Countable { |
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/** |
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* All sockets in the reactor, keyed by ID. |
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* |
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* @var ReactiveInterface[] |
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*/ |
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protected $sockets = []; |
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/** |
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* Selects instances. Can be used to select non-reactive sockets. |
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* |
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* @see https://php.net/socket_select |
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* |
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* @param SocketInterface[] $read |
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* @param SocketInterface[] $write |
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* @param SocketInterface[] $except |
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* @param float|null $timeout Maximum seconds to block. `NULL` blocks forever. |
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* @return int |
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* @throws SocketError |
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*/ |
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public static function select (array &$read, array &$write, array &$except, ?float $timeout = null): int { |
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$rwe = [$read, $write, $except]; |
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array_walk_recursive($rwe, function(SocketInterface &$each) { |
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$each = $each->getResource(); |
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}); |
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$uSec = (int)(fmod($timeout, 1) * 1000000); // ignored if timeout is null |
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$count = @socket_select($rwe[0], $rwe[1], $rwe[2], $timeout, $uSec); // keys are preserved |
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if ($count === false) { |
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$read = $write = $except = []; |
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throw new SocketError; |
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} |
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$read = array_intersect_key($read, $rwe[0]); |
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$write = array_intersect_key($write, $rwe[1]); |
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$except = array_intersect_key($except, $rwe[2]); |
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return $count; |
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} |
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/** |
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* Adds a reactive socket for selection. |
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* |
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* @param ReactiveInterface $socket |
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* @return $this |
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*/ |
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public function add (ReactiveInterface $socket) { |
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$this->sockets[$socket->getId()] = $socket; |
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return $this; |
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} |
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/** |
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* The number of reactive sockets in the reactor. |
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* |
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* @return int |
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*/ |
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public function count (): int { |
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return count($this->sockets); |
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} |
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/** |
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* @return ReactiveInterface[] |
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*/ |
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public function getSockets () { |
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return $this->sockets; |
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} |
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/** |
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* @param int $channel |
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* @param ReactiveInterface $socket |
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* @param Throwable $error |
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*/ |
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public function onError (int $channel, $socket, Throwable $error) { |
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unset($channel); |
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if ($socket instanceof WebSocketClient and $error instanceof WebSocketError) { |
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$socket->close($error->getCode(), $error->getMessage()); |
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} |
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else { |
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$socket->close(); |
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} |
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echo $error; |
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} |
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/** |
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* Selects the reactor's sockets and calls their reactive methods. |
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* |
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* Invoke this in a loop that checks {@link Reactor::count()} a condition. |
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* |
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* Closed sockets are automatically removed from the reactor. |
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* |
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* @param float|null $timeout Maximum seconds to block. `NULL` blocks forever. |
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* @return int Number of sockets selected. |
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*/ |
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public function react (?float $timeout = null): int { |
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/** @var ReactiveInterface[][] $rwe */ |
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$rwe = [$this->sockets, [], $this->sockets]; |
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$count = static::select($rwe[0], $rwe[1], $rwe[2], $timeout); |
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foreach ([2 => 'onOutOfBand', 0 => 'onReadable'] as $channel => $method) { |
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foreach ($rwe[$channel] as $id => $socket) { |
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try { |
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$socket->{$method}(); |
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} |
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catch (Throwable $error) { |
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$this->onError($channel, $socket, $error); |
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} |
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finally { |
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if (!$socket->isOpen()) { |
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$this->remove($socket); |
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} |
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} |
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} |
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} |
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return $count; |
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} |
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/** |
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* Removes a socket from the reactor. |
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* |
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* @param ReactiveInterface $socket |
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* @return $this |
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*/ |
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public function remove (ReactiveInterface $socket) { |
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unset($this->sockets[$socket->getId()]); |
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return $this; |
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} |
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} |
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hfw /
socket
