Bug #81029 [NEW]: SOAP HTTP socket not closing on object destruction

From: Date: Tue, 11 May 2021 10:32:30 +0000
Subject: Bug #81029 [NEW]: SOAP HTTP socket not closing on object destruction
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-233779@lists.php.net to get a copy of this message 
From:             kdonaldson at staff dot nexigen dot digital
Operating system: macOS and Cent OS 7
PHP version:      7.4.19
Package:          SOAP related
Bug Type:         Bug
Bug description:SOAP HTTP socket not closing on object destruction

Description:
------------
If a SoapClient object is constructed without specifying the
'keep_alive' option to false, the socket never appears to be closed if
it falls out of scope

The provided script should be able to reproduce this, you can check the
open sockets by running the script like: "php /path/to/script.php &" and
using the resulting PID on "lsof -a -p {pid}"

You should slowly see a list of TCP connections slowly build up over
time similar to this:

php     4396 vagrant    3u  IPv4  53416      0t0     TCP
homestead:57814->ec2-52-7-155-169.compute-1.amazonaws.com:https
(ESTABLISHED)
php     4396 vagrant    4u  IPv4  53447      0t0     TCP
homestead:57816->ec2-52-7-155-169.compute-1.amazonaws.com:https
(ESTABLISHED)
php     4396 vagrant    5u  IPv4  54451      0t0     TCP
homestead:57818->ec2-52-7-155-169.compute-1.amazonaws.com:https
(ESTABLISHED)

If instead you were to add ['keep_alive' => false] as the options
parameter on the SoapClient you'll see that the TCP connections don't
appear to build up.

While I do understand the purpose of Keep Alive to keep a single
connection open, I would assume this is still a bug as the SoapClient
has gone out of scope and new SoapClient objects don't appear to reuse
the existing connection and simply ignore it creating a new one.

Test script:
---------------
<?php

function call(int $number) {
    $client = new
SoapClient('https://www.dataaccess.com/webservicesserver/NumberConversion.wso?WSDL');
    $response = $client->NumberToWords(['ubiNum' => $number]);
    return $response->NumberToWordsResult;
}

$numbers = array_fill(0, 10000, 1);

foreach ($numbers as $number) {
    call($number);
}

Expected result:
----------------
The socket to be closed when the SoapClient object falls out of scope or
destructs

Actual result:
--------------
The socket stays open and contributes to the open file limit / file
descriptor limit

-- 
Edit bug report at https://bugs.php.net/bug.php?id=81029&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=81029&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=81029&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=81029&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=81029&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=81029&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=81029&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=81029&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=81029&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=81029&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=81029&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=81029&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=81029&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=81029&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=81029&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=81029&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=81029&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=81029&r=mysqlcfg

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