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#!/usr/bin/env php
<?php
// Check that the memcache library is enabled
if (!class_exists('Memcache') && !class_exists('Memcached')) {
echo "Error: the memcached (or memcache) PHP extension appears to be unavailable.\n";
echo "\n";
echo "This is most likely because PHP doesn't load it for the command line\n";
echo "version. You probably need to enable it somehow.\n";
echo "\n";
if (is_executable('/usr/sbin/phpenmod')) {
echo "It is possible that running one of the following commands as root will fix it:\n";
echo " phpenmod -s cli memcached\n";
echo " phpenmod -s cli memcache\n";
}
exit(1);
}
// This is the base directory of the SimpleSAMLphp installation
$baseDir = dirname(dirname(__FILE__));
// Add library autoloader
require_once($baseDir . '/lib/_autoload.php');
// Initialize the configuration
$configdir = SimpleSAML\Utils\Config::getConfigDir();
\SimpleSAML\Configuration::setConfigDir($configdir);
// Things we should warn the user about
$warnServerDown = 0;
$warnBigSlab = 0;
// We use the stats interface to determine which servers exists
$stats = \SimpleSAML\Memcache::getRawStats();
$keys = [];
foreach ($stats as $group) {
foreach ($group as $server => $state) {
if ($state === false) {
echo "WARNING: Server " . $server . " is down.\n";
$warnServerDown++;
continue;
}
$items = $state['curr_items'];
echo "Server " . $server . " has " . $items . " items.\n";
$serverKeys = getServerKeys($server);
$keys = array_merge($keys, $serverKeys);
}
}
echo "Total number of keys: " . count($keys) . "\n";
$keys = array_unique($keys);
echo "Total number of unique keys: " . count($keys) . "\n";
echo "Starting synchronization.\n" ;
$skipped = 0;
$sync = 0;
foreach ($keys as $key) {
$res = \SimpleSAML\Memcache::get($key);
if ($res === null) {
$skipped += 1;
} else {
$sync += 1;
}
}
echo "Synchronization done.\n";
echo $sync . " keys in sync.\n";
if ($skipped > 0) {
echo $skipped . " keys skipped.\n";
echo "Keys are skipped because they are either expired, or are of a type unknown\n";
echo "to SimpleSAMLphp.\n";
}
if ($warnServerDown > 0) {
echo "WARNING: " . $warnServerDown . " server(s) down. Not all servers are synchronized.\n";
}
if ($warnBigSlab > 0) {
echo "WARNING: " . $warnBigSlab . " slab(s) may have contained more keys than we were told about.\n";
}
/**
* Fetch all keys available in an server.
*
* @param string $server The server, as a string with <hostname>:<port>.
*
* @return array An array with all the keys available on the server.
*/
function getServerKeys(string $server): array
{
$server = explode(':', $server);
$host = $server[0];
$port = (int) $server[1];
echo "Connecting to: " . $host . ":" . $port . "\n";
$socket = fsockopen($host, $port);
echo "Connected. Finding keys.\n";
if (fwrite($socket, "stats slabs\r\n") === false) {
echo "Error requesting slab dump from server.\n";
exit(1);
}
// Read list of slabs
$slabs = [];
while (($line = fgets($socket)) !== false) {
$line = rtrim($line);
if ($line === 'END') {
break;
}
if (preg_match('/^STAT (\d+):/', $line, $matches)) {
$slab = (int) $matches[1];
if (!in_array($slab, $slabs, true)) {
$slabs[] = $slab;
}
}
}
// Dump keys in slabs
$keys = [];
foreach ($slabs as $slab) {
if (fwrite($socket, "stats cachedump " . $slab . " 1000000\r\n") === false) {
echo "Error requesting cache dump from server.\n";
exit(1);
}
/* We keep track of the result size, to be able to warn the user if it is
* so big that keys may have been lost.
*/
$resultSize = 0;
while (($line = fgets($socket)) !== false) {
$resultSize += strlen($line);
$line = rtrim($line);
if ($line === 'END') {
break;
}
if (preg_match('/^ITEM (.*) \[\d+ b; \d+ s\]/', $line, $matches)) {
$keys[] = $matches[1];
} else {
echo "Unknown result from cache dump: " . $line . "\n";
}
}
if ($resultSize > 1900000 || count($keys) >= 1000000) {
echo "WARNING: Slab " . $slab . " on server " . $host . ":" . $port .
" may have contained more keys than we were told about.\n";
$GLOBALS['warnBigSlab'] += 1;
}
}
echo "Found " . count($keys) . " key(s).\n";
fclose($socket);
return $keys;
}
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