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[2004-08-19 21:55 UTC] pbnadeau at gmail dot com
Description:
------------
If you store some object in memcache (like a simple array(1=>'a', 2=>'b') ) it will automatically serialize the data, but when you will retreive it it won't be unserialized. You need to change line 1384 of memcache.c.v.1.21 from
else if (flags == MMC_SERIALIZED) {
to
else if (flags & MMC_SERIALIZED) {
Reproduce code:
---------------
<html><body><pre>
<?php
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
$memcache = memcache_pconnect('192.168.1.1', 7777);
$key = "test_unserialize_pibm";
$arr = array(1=>'a', 3=>'b');
echo "saving the following array in $key\n";
print_r($arr);
$memcache->set($key, $arr);
$result = $memcache->get($key);
echo "Obtained :\n";
if (is_array($result)) {
print_r($result);
} else {
echo $result."\n";
}
echo "if you obtained " . serialize ($arr) . " you need to fix the memcache bug :)\n";
?>
</pre></body></html>
Expected result:
----------------
saving the following array in test_unserialize_pibm
Array
(
[1] => a
[3] => b
)
Obtained :
Array
(
[1] => a
[3] => b
)
if you obtained a:2:{i:1;s:1:"a";i:3;s:1:"b";} you need to fix the memcache bug :)
Actual result:
--------------
saving the following array in test_unserialize_pibm
Array
(
[1] => a
[3] => b
)
Obtained :
a:2:{i:1;s:1:"a";i:3;s:1:"b";}
if you obtained a:2:{i:1;s:1:"a";i:3;s:1:"b";} you need to fix the memcache bug :)
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Last updated: Tue May 13 07:01:26 2025 UTC |
I closed one of the server to run the test. I first ran it with the newest version and it ran fine, then I put the old php version (with memcache 1.21) and it ran fine too. So I tested it on the original code that was buggy and the error was there for the original mem_cache but not for my corrected version. I ended up grepping the whole site for mem-> and checked them all. It ended up that one $mem->replace was passing a non-null value in the flags section if the compression wasn't required. Thus, the equal comparison wasn't working. I believe that the code should still be corrected and even modified that if the serialize flag is passed, it won't be kept if it's not done. Here's a test you can do. Running on the original server I get the error as stated before, but it works with my correction. <html><body><pre> <?php header("Cache-Control: no-cache, must-revalidate"); header("Pragma: no-cache"); function display($result) { echo "Obtained :\n"; if (is_array($result)) { print_r($result); } else { echo $result."\n"; } } echo "if you obtained " . $arr . " you then everything is right.\n\n"; $memcache = memcache_pconnect('192.168.1.1', 7777); $key = "test_unserialize_pibm"; $arr = array('userid'=>1721, 'ip'=>'132.203.32.7'); echo "saving the following array in $key\n"; print_r($arr); $memcache->set($key, $arr, 32, 3600); display($memcache->get($key)); echo "if you obtained " . serialize ($arr) . " you need to fix the memcache bug :)\n\n"; $key = "test_ask_unserialize"; $arr = serialize($arr); echo "saving $arr in $key\n"; $memcache->set($key, $arr, 1, 3600); display($memcache->get($key)); echo "if you obtained $arr then everything is right, else there's something to do!\n\n"; ?> </pre></body></html> ============================= result with original version: saving the following array in test_unserialize_pibm Array ( [userid] => 1721 [ip] => 132.203.32.7 ) Obtained : a:2:{s:6:"userid";i:1721;s:2:"ip";s:12:"132.203.32.7";} if you obtained a:2:{s:6:"userid";i:1721;s:2:"ip";s:12:"132.203.32.7";} you need to fix the memcache bug :) saving a:2:{s:6:"userid";i:1721;s:2:"ip";s:12:"132.203.32.7";} in test_ask_unserialize Obtained : Array ( [userid] => 1721 [ip] => 132.203.32.7 ) if you obtained a:2:{s:6:"userid";i:1721;s:2:"ip";s:12:"132.203.32.7";} then everything is right, else there's something to do! ============================= the corrected version gives : saving the following array in test_unserialize_pibm Array ( [userid] => 1721 [ip] => 132.203.32.7 ) Obtained : Array ( [userid] => 1721 [ip] => 132.203.32.7 ) if you obtained a:2:{s:6:"userid";i:1721;s:2:"ip";s:12:"132.203.32.7";} you need to fix the memcache bug :) saving a:2:{s:6:"userid";i:1721;s:2:"ip";s:12:"132.203.32.7";} in test_ask_unserialize Obtained : Array ( [userid] => 1721 [ip] => 132.203.32.7 ) if you obtained a:2:{s:6:"userid";i:1721;s:2:"ip";s:12:"132.203.32.7";} then everything is right, else there's something to do! ============================= So, the first behavior, as when a different value than null not containing 1 is passed making it not unserialize the content is corrected. But, when that value contain one, if it wasn't auto-serialized it will unserialize anyway because the first bit was set externally. That one can be kept as a design decision, but that still could lead to special cases. I've fixed that website so whatever the decision is it will work..