public function on(string $event, Closure $closure)
{
if (!isset($this->listeners[$event])) {
$this->listeners[$event] = [];
}
$this->listeners[$event][] = Coroutine\wrap($this->wrap($closure));
}
public function __construct()
{
$this->timerCallback = Coroutine\wrap(function (Timer $timer) : \Generator {
$key = $timer->getData();
yield from $this->wait($key);
// Wait if key is locked.
// Delete only if value has not been changed.
if (isset($this->timers[$key]) && $timer === $this->timers[$key]) {
yield from $this->delete($key);
}
});
}
/**
* @param float $interval
* @param int $maxSize
* @param int $maxFrames
*
* @return \Icicle\Observable\Observable
*/
private function createObservable(float $interval, int $maxSize, int $maxFrames) : Observable
{
return new Emitter(function (callable $emit) use($interval, $maxSize, $maxFrames) : \Generator {
/** @var \Icicle\WebSocket\Protocol\Rfc6455Frame[] $frames */
$frames = [];
$size = 0;
$ping = Loop\periodic($interval, Coroutine\wrap(function () use(&$pong, &$expected) {
try {
yield from $this->ping($expected = base64_encode(random_bytes(self::PING_DATA_LENGTH)));
if (null === $pong) {
$pong = Loop\timer($this->timeout, Coroutine\wrap(function () {
yield from $this->close(Close::VIOLATION);
$this->transporter->close();
}));
$pong->unreference();
} else {
$pong->again();
}
} catch (\Throwable $exception) {
$this->transporter->close();
}
}));
$ping->unreference();
try {
while ($this->transporter->isOpen()) {
/** @var \Icicle\WebSocket\Protocol\Rfc6455Frame $frame */
$frame = (yield from $this->transporter->read($maxSize - $size));
$ping->again();
switch ($type = $frame->getType()) {
case Frame::CLOSE:
// Close connection.
if (!$this->closed) {
// Respond with close frame if one has not been sent.
yield from $this->close(Close::NORMAL);
}
$data = $frame->getData();
if (2 > strlen($data)) {
return new Close(Close::NO_STATUS);
}
$bytes = unpack('ncode', substr($data, 0, 2));
$data = (string) substr($data, 2);
if (!preg_match('//u', $data)) {
throw new DataException('Invalid UTF-8 data received.');
}
return new Close($bytes['code'], $data);
case Frame::PING:
// Respond with pong frame.
yield from $this->pong($frame->getData());
continue;
case Frame::PONG:
// Cancel timeout set by sending ping frame.
// Only stop timer if ping sent and pong data matches ping data.
if (null !== $pong && $frame->getData() === $expected) {
$pong->stop();
}
continue;
case Frame::CONTINUATION:
$count = count($frames);
if (0 === $count) {
throw new ProtocolException('Received orphan continuation frame.');
}
$frames[] = $frame;
$size += $frame->getSize();
if (!$frame->isFinal()) {
if ($count + 1 >= $maxFrames) {
throw new PolicyException('Too many frames in message.');
}
continue;
}
$data = '';
for ($i = $count; $i >= 0; --$i) {
$frame = $frames[$i];
$data = $frame->getData() . $data;
}
$frames = [];
$size = 0;
$type = $frame->getType();
if ($type === Frame::TEXT && !preg_match('//u', $data)) {
throw new DataException('Invalid UTF-8 data received.');
}
yield from $emit(new Message($data, $type === Frame::BINARY));
continue;
case Frame::TEXT:
case Frame::BINARY:
if (!empty($frames)) {
throw new ProtocolException('Expected continuation data frame.');
}
if (!$frame->isFinal()) {
$size = $frame->getSize();
$frames[] = $frame;
continue;
}
$data = $frame->getData();
if ($type === Frame::TEXT && !preg_match('//u', $data)) {
throw new DataException('Invalid UTF-8 data received.');
}
yield from $emit(new Message($data, $type === Frame::BINARY));
continue;
default:
throw new ProtocolException('Received unrecognized frame type.');
}
}
} catch (ConnectionException $exception) {
$close = new Close($exception->getReasonCode(), $exception->getMessage());
} catch (SocketException $exception) {
$close = new Close(Close::ABNORMAL, $exception->getMessage());
} catch (StreamException $exception) {
$close = new Close(Close::ABNORMAL, $exception->getMessage());
} catch (TimeoutException $exception) {
$close = new Close(Close::GOING_AWAY, $exception->getMessage());
} finally {
$ping->stop();
if (null !== $pong) {
$pong->stop();
}
}
if (!isset($close)) {
$close = new Close(Close::ABNORMAL, 'Peer unexpectedly disconnected.');
}
if ($this->isOpen()) {
yield from $this->close($close->getCode());
}
return $close;
});
}