Error of activate the readable watcher for event extension

[deadbeat88]

At application where there are a lot of async filesytem operations, also uses rabbitmq and postgres. Sometimes I get the following error: Warning: Event::__construct(): 2 bytes of buffered data lost during stream conversion!' at /var/www/vendor/amphp/amp/lib/Loop/EventDriver.php:245 and then application is crushed. Any idea with this error? Use v2.1.2.

[kelunik]

I have no idea why that might happen. Could you report that as a bug to the event extension at https://bitbucket.org/osmanov/pecl-event?

[rosmanov]

@deadbeat88 created an issue here: https://bitbucket.org/osmanov/pecl-event/issues/56/bug-of-stream-conversion.

The warning occurs when Event::__construct tries to obtain numeric file descriptor from a PHP stream resource. I don't know how to handle this warning except using the PHP_STREAM_CAST_INTERNAL flag ("stream cast for internal use"). The flag even seems to be appropriate in our case 🤔

It should be noted that the warning wouldn't appear in case of using numeric file descriptor, or a socket resource instead of a PHP stream.

[kelunik]

@rosmanov I guess it might be a TLS socket?

@deadbeat88 Could you check with stream_get_meta_data which kind of steam is responsible for that warning?

[rosmanov]

@kelunik could be just any stream resource (resource created with the sockets extension is a different thing)

@kelunik @deadbeat88 I've now added PHP_STREAM_CAST_INTERNAL flag in the master branch. Let's check if everything is okay. If it is, I'll publish a new PECL release.

[deadbeat88]

Today after your comment about stream resource I narrowed down the search and found that the error occurs when using Amp\Process\Proccess:

$process = new Process($cmd);
yield $process->start();
/** @var string $content */
$content = yield buffer($process->getStdout());
/** @var int $code */
$code = yield $process->join();

for example for $cmd='cd "/tmp/i_48daffb4fba88a87d24d95adb2c583cd934dc775" && zip 48daffb4fba88a87d24d95adb2c583cd934dc775 receipts.xml'

Approximately 1 time out of 10-15 when executing the code

/** \Amp\ByteStream\buffer */
while (($chunk = yield $source->read()) !== null) {
    $buffer .= $chunk;
    $chunk = null; // free memory
}

ends with an error.

Later, I will check with an update of event extension)

[deadbeat88]

@rosmanov released new version 2.5.3, bug fixed and issue can be closed.

[kelunik]

Cool!