/**
* Throws an error in the observable.
*
* @param \Throwable $reason
*/
public function fail(\Throwable $reason)
{
if (null !== $this->started) {
$this->started->reject(new CompletedError());
}
$this->delayed->reject($reason);
}
/**
* Marks the observable as complete with the given error.
*
* @param \Throwable $exception
*/
public function fail(\Throwable $exception)
{
if (null === $this->observable) {
return;
}
$this->observable = null;
$this->failed = true;
$this->delayed->reject($exception);
}
/**
* @throws \Icicle\Concurrent\Exception\ProcessException If starting the process fails.
* @throws \Icicle\Concurrent\Exception\StatusError If the process is already running.
*/
public function start()
{
if (null !== $this->delayed) {
throw new StatusError('The process has already been started.');
}
$this->delayed = new Delayed();
$fd = [['pipe', 'r'], ['pipe', 'w'], ['pipe', 'a'], ['pipe', 'w']];
$nd = 0 === strncasecmp(PHP_OS, 'WIN', 3) ? 'NUL' : '/dev/null';
$command = sprintf('(%s) 3>%s; code=$?; echo $code >&3; exit $code', $this->command, $nd);
$this->process = proc_open($command, $fd, $pipes, $this->cwd ?: null, $this->env ?: null, $this->options);
if (!is_resource($this->process)) {
throw new ProcessException('Could not start process.');
}
$this->oid = getmypid();
$status = proc_get_status($this->process);
if (!$status) {
proc_close($this->process);
$this->process = null;
throw new ProcessException('Could not get process status.');
}
$this->pid = $status['pid'];
$this->stdin = new WritablePipe($pipes[0]);
$this->stdout = new ReadablePipe($pipes[1]);
$this->stderr = new ReadablePipe($pipes[2]);
$stream = $pipes[3];
stream_set_blocking($stream, 0);
$this->poll = Loop\poll($stream, function ($resource) {
if (!is_resource($resource) || feof($resource)) {
$this->close($resource);
$this->delayed->reject(new ProcessException('Process ended unexpectedly.'));
} else {
$code = fread($resource, 1);
$this->close($resource);
if (!strlen($code) || !is_numeric($code)) {
$this->delayed->reject(new ProcessException('Process ended without providing a status code.'));
} else {
$this->delayed->resolve((int) $code);
}
}
$this->poll->free();
});
}
/**
* {@inheritdoc}
*/
public function read(int $length = 0, string $byte = null, float $timeout = 0) : \Generator
{
while (null !== $this->delayed) {
(yield $this->delayed);
}
if (!$this->isReadable()) {
throw new UnreadableException('The stream is no longer readable.');
}
$this->length = $length;
if (0 > $this->length) {
throw new InvalidArgumentError('The length should be a positive integer.');
}
$this->byte = strlen($byte) ? $byte[0] : null;
if (!$this->buffer->isEmpty()) {
$data = $this->remove();
if (0 !== $this->hwm && $this->buffer->getLength() <= $this->hwm) {
while (!$this->queue->isEmpty()) {
/** @var \Icicle\Awaitable\Delayed $delayed */
$delayed = $this->queue->shift();
$delayed->resolve();
}
}
if (!$this->writable && $this->buffer->isEmpty()) {
$this->free();
}
return $data;
}
$awaitable = $this->delayed = new Delayed();
if ($timeout) {
$awaitable = $this->delayed->timeout($timeout);
}
try {
$data = (yield $awaitable);
} finally {
$this->delayed = null;
}
return $data;
}
/**
* Notifies the placeholder that the consumer is ready.
*/
public function ready()
{
if (0 === --$this->waiting) {
$this->delayed->resolve();
}
}
/**
* Returns an observable that emits a value every $interval seconds, up to $count times (or indefinitely if $count
* is 0). The value emitted is an integer of the number of times the observable emitted a value.
*
* @param float|int $interval Time interval between emitted values in seconds.
* @param int $count Use 0 to emit values indefinitely.
*
* @return \Icicle\Observable\Observable
*/
function interval(float $interval, int $count = 0) : Observable
{
return new Emitter(function (callable $emit) use($interval, $count) : \Generator {
if (0 > $count) {
throw new InvalidArgumentError('The number of times to emit must be a non-negative value.');
}
$start = microtime(true);
$i = 0;
$delayed = new Delayed();
$timer = Loop\periodic($interval, function () use(&$delayed, &$i) {
$delayed->resolve(++$i);
$delayed = new Delayed();
});
try {
while (0 === $count || $i < $count) {
yield from $emit($delayed);
}
} finally {
$timer->stop();
}
return microtime(true) - $start;
});
}
/**
* Throws an error in the observable.
*
* @param \Throwable $reason
*/
public function fail(\Throwable $reason)
{
$this->delayed->reject($reason);
}
