/**
* Executes libuv callbacks and ensures that the loop keeps running until the callback has been invoked.
*
* Arguments must contain 1 closure that is assumed to be the callback being invoked by libuv.
*
* @param string $func The name of the uv function to be called.
* @param mixed $args Arguments to be passed to the function.
* @return mixed Value returned / error thrown by the passed callback.
*
* @throws \InvalidArgumentException When no callback argument has been passed.
*/
public function handleCallback(string $func, ...$args) : Awaitable
{
$defer = new Deferred();
$defer->when(function () {
$this->watchersReferenced--;
});
for ($len = \count($args), $i = 0; $i < $len; $i++) {
if ($args[$i] instanceof \Closure) {
$callback = $args[$i];
$args[$i] = function (...$args) use($defer, $callback) {
try {
$result = $callback(...$args);
} catch (\Throwable $e) {
return $defer->fail($e);
}
if ($result instanceof \Generator) {
$defer->resolve(new Coroutine($result));
} else {
$defer->resolve($result);
}
};
break;
}
}
if (!isset($callback)) {
return new Failure(new \InvalidArgumentException('Missing callback argument'));
}
$this->watchersReferenced++;
try {
$func(...\array_merge([$this->loop], $args));
} catch (\Throwable $e) {
$this->watchersReferenced--;
return new Failure($e);
}
return $defer;
}
public function handleCallback(string $func, ...$args) : Awaitable
{
$request = null;
$defer = new Deferred(function () use(&$request) {
if (\is_resource($request)) {
\eio_cancel($request);
}
});
$defer->when(function () {
$this->pending--;
if (!$this->pending) {
Loop::disable($this->watcherId);
}
});
for ($len = \count($args), $i = 0; $i < $len; $i++) {
if ($args[$i] instanceof \Closure) {
$callback = $args[$i];
$args[$i] = function (...$args) use($defer, $callback) {
try {
$result = $callback(...$args);
} catch (\Throwable $e) {
return $defer->fail($e);
}
if ($result instanceof \Generator) {
$defer->resolve(new Coroutine($result));
} else {
$defer->resolve($result);
}
};
break;
}
}
if (!isset($callback)) {
throw new \InvalidArgumentException('Missing callback argument');
}
if (!$this->pending) {
if ($this->watcherId === null) {
$this->watcherId = Loop::onReadable(self::$eio, self::$callback);
} else {
Loop::enable($this->watcherId);
}
}
$this->pending++;
try {
$request = $func(...$args);
} catch (\Throwable $e) {
$this->pending--;
if (!$this->pending) {
Loop::disable($this->watcherId);
}
return new Failure($e);
}
return $defer;
}