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Bug #81406 MYSQLI_CLIENT_COMPRESS does not work with aurora MySQL Compatible
Submitted: 2021-09-01 15:58 UTC Modified: 2021-09-06 08:57 UTC
From: martin dot barker at thisisbeacon dot com Assigned:
Status: Open Package: MySQLi related
PHP Version: 8.0.10 OS: Windows 10/11
Private report: No CVE-ID: None
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 [2021-09-01 15:58 UTC] martin dot barker at thisisbeacon dot com
Description:
------------
When trying to connect to a MySQL Compatible Aurora RDS using MYSQLI_CLIENT_COMPRESS PHP just gets stuck on the first query set to the server, be that a set_charset method or an actual query,

According to AWS Staff Wire Compression used in Aurora MySQL Compatible should work with any MySQL Client supporting it (https://forums.aws.amazon.com/thread.jspa?messageID=850833#850833), as PHP's MySQLi System is supposed to support it this should work.


This may be a regression from https://bugs.php.net/bug.php?id=47017

Test script:
---------------
$mysqli = new mysqli();
$mysqli->real_connect('hostname', "username", "password", "alexandria", 3306, '', MYSQLI_CLIENT_COMPRESS);
if(!$mysqli){
    die("unable to connect to DB");
}
$mysqli->set_charset("utf8mb3");

Expected result:
----------------
PHP to use the compressed connection correctly and not just Freeze, 

Actual result:
--------------
in the test script, the die code is not executed meaning that PHP thinks it connected correctly, but then the set_charset call will just freeze even past the 30-second default timeout.

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 [2021-09-06 08:51 UTC] cmb@php.net
The script works for me with PHP-7.4 and PHP-8.0 with local MySQL
5.6 and 8.0.
 [2021-09-06 08:57 UTC] martin dot barker at thisisbeacon dot com
So I was using PHP 8 locally on windows, and connecting to an Aurora RDS via an SSL VPN (Whatgaurd's Mobile VPN with SSL client), and to confirm it was not the SSL VPN i used MySQL Workbench and that worked. I also did not get a failure to connect error from PHP,
 
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Last updated: Wed Dec 01 18:03:35 2021 UTC