[Stream] STREAM_NOTIFY_COMPLETED over HTTP never emitted

[sfaut]

Description

The following code:

<?php

function progress($notification_code, $severity, $message, $message_code, $bytes_transferred, $bytes_maximum)
{
    printf(
        "%d\t%s\t%d\t%d\r\n",
        $notification_code,
        $notification_code == STREAM_NOTIFY_COMPLETED ? 'T' : 'F',
        $bytes_transferred, $bytes_maximum,
    );
};

$context = stream_context_create();
stream_context_set_params($context, ['notification' => 'progress']);
$stream_source = fopen('https://datasets.imdbws.com/title.ratings.tsv.gz', 'r', false, $context); // 6 MB file
$stream_destination = fopen('title.ratings.tsv.gz', 'w');
stream_copy_to_stream($stream_source, $stream_destination);

Resulted in this output:

2       F       0       0
4       F       0       0
5       F       0       6223383
7       F       0       6223383
7       F       8192    6223383
7       F       16384   6223383
7       F       24576   6223383
...
7       F       6207960 6223383
7       F       6216152 6223383
7       F       6223383 6223383

But I expected this output instead:

2       F       0       0
4       F       0       0
5       F       0       6223383
7       F       0       6223383
7       F       8192    6223383
7       F       16384   6223383
7       F       24576   6223383
...
7       F       6207960 6223383
7       F       6216152 6223383
8       T       6223383 6223383

With the last $notification_code = 8 as "STREAM_NOTIFY_COMPLETED".

Note that the last row has not always $bytes_transferred == $bytes_maximum

Thx :)

PHP Version

PHP 8.1.6

Operating System

Windows 10

[cmb69]

From a quick grep across the PHP-8.1 codebase, STREAM_NOTIFY_COMPLETED is never used. Not sure how to classify this ticket: bug or feature request.

[sfaut]

STREAM_NOTIFY_COMPLETED is given as example in https://www.php.net/manual/function.stream-notification-callback
and should be implemented. Imho it should be considered like a bug.

Thx for your support,

[iluuu1994]

I've looked through old versions and this was never implemented, so I think this qualifies as a feature request and/or documentation issue.

[cmb69]

Yeah, probably wouldn't make sense to treat it as bug, given it was never implemented, although I wonder why STREAM_NOTIFY_COMPLETED is there, and even has been documented.

[aetonsi]

the last row has not always $bytes_transferred == $bytes_maximum

Since STREAM_NOTIFY_PROGRESS is not always emitted correctly (see #10031) and STREAM_NOTIFY_COMPLETED is never emitted, currently there's no way (from inside the notification callback) to determine if the download was completed. You have to check if the fetch operation (fopen, file_get_contents, etc) errored out or not.

[nielsdos]

I worked on an implementation of this feature and ran into #10031 as well (the completed event now triggers twice sometimes), so I'm going to spend some time to debug that issue.