memory.lib.php

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<?php
/* Copyright (C) 2009-2010 Laurent Destailleur  <eldy@users.sourceforge.net>
 * Copyright (C) 2021       Frédéric France     <frederic.france@netlogic.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 * or see https://www.gnu.org/
 */
 
global $shmkeys, $shmoffset;
 
$shmkeys = array(
  'main' => 1,
  'admin' => 2,
  'dict' => 3,
  'companies' => 4,
  'suppliers' => 5,
  'products' => 6,
  'commercial' => 7,
  'compta' => 8,
  'projects' => 9,
  'cashdesk' => 10,
  'agenda' => 11,
  'bills' => 12,
  'propal' => 13,
  'boxes' => 14,
  'banks' => 15,
  'other' => 16,
  'errors' => 17,
  'members' => 18,
  'ecm' => 19,
  'orders' => 20,
  'users' => 21,
  'help' => 22,
  'stocks' => 23,
  'interventions' => 24,
  'donations' => 25,
  'contracts' => 26,
);
$shmoffset = 1000; // Max number of entries found into a language file. If too low, some entries will be overwritten.
 
 
 
function dol_setcache($memoryid, $data, $expire = 0)
{
  global $conf;
  $result = 0;
 
  if (strpos($memoryid, 'count_') === 0) {  // The memoryid key start with 'count_...'
    if (empty($conf->global->MAIN_CACHE_COUNT)) {
      return 0;
    }
  }
 
  if (!empty($conf->memcached->enabled) && class_exists('Memcached')) {
    // Using a memcached server
    global $dolmemcache;
    if (empty($dolmemcache) || !is_object($dolmemcache)) {
      $dolmemcache = new Memcached();
      $tmparray = explode(':', $conf->global->MEMCACHED_SERVER);
      $result = $dolmemcache->addServer($tmparray[0], $tmparray[1] ? $tmparray[1] : 11211);
      if (!$result) {
        return -1;
      }
    }
 
    $memoryid = session_name().'_'.$memoryid;
    //$dolmemcache->setOption(Memcached::OPT_COMPRESSION, false);
    $dolmemcache->add($memoryid, $data, $expire); // This fails if key already exists
    $rescode = $dolmemcache->getResultCode();
    if ($rescode == 0) {
      return is_array($data) ? count($data) : (is_scalar($data) ? strlen($data) : 0);
    } else {
      return -$rescode;
    }
  } elseif (!empty($conf->memcached->enabled) && class_exists('Memcache')) {  // This is a really not reliable cache ! Use Memcached instead.
    // Using a memcache server
    global $dolmemcache;
    if (empty($dolmemcache) || !is_object($dolmemcache)) {
      $dolmemcache = new Memcache();
      $tmparray = explode(':', $conf->global->MEMCACHED_SERVER);
      $result = $dolmemcache->addServer($tmparray[0], $tmparray[1] ? $tmparray[1] : 11211);
      if (!$result) {
        return -1;
      }
    }
 
    $memoryid = session_name().'_'.$memoryid;
    //$dolmemcache->setOption(Memcached::OPT_COMPRESSION, false);
    $result = $dolmemcache->add($memoryid, $data, false, $expire); // This fails if key already exists
    if ($result) {
      return is_array($data) ? count($data) : (is_scalar($data) ? strlen($data) : 0);
    } else {
      return -1;
    }
  } elseif (isset($conf->global->MAIN_OPTIMIZE_SPEED) && ($conf->global->MAIN_OPTIMIZE_SPEED & 0x02)) { // This is a really not reliable cache ! Use Memcached instead.
    // Using shmop
    $result = dol_setshmop($memoryid, $data, $expire);
  }
 
  return $result;
}
 
function dol_getcache($memoryid)
{
  global $conf;
 
  if (strpos($memoryid, 'count_') === 0) {  // The memoryid key start with 'count_...'
    if (empty($conf->global->MAIN_CACHE_COUNT)) {
      return null;
    }
  }
 
  // Using a memcached server
  if (!empty($conf->memcached->enabled) && class_exists('Memcached')) {
    global $m;
    if (empty($m) || !is_object($m)) {
      $m = new Memcached();
      $tmparray = explode(':', $conf->global->MEMCACHED_SERVER);
      $result = $m->addServer($tmparray[0], $tmparray[1] ? $tmparray[1] : 11211);
      if (!$result) {
        return -1;
      }
    }
 
    $memoryid = session_name().'_'.$memoryid;
    //$m->setOption(Memcached::OPT_COMPRESSION, false);
    //print "Get memoryid=".$memoryid;
    $data = $m->get($memoryid);
    $rescode = $m->getResultCode();
    //print "memoryid=".$memoryid." - rescode=".$rescode." - count(response)=".count($data)."\n<br>";
    //var_dump($data);
    if ($rescode == 0) {
      return $data;
    } elseif ($rescode == 16) {   // = Memcached::MEMCACHED_NOTFOUND but this constant doe snot exists.
      return null;
    } else {
      return -$rescode;
    }
  } elseif (!empty($conf->memcached->enabled) && class_exists('Memcache')) {  // This is a really not reliable cache ! Use Memcached instead.
    global $m;
    if (empty($m) || !is_object($m)) {
      $m = new Memcache();
      $tmparray = explode(':', $conf->global->MEMCACHED_SERVER);
      $result = $m->addServer($tmparray[0], $tmparray[1] ? $tmparray[1] : 11211);
      if (!$result) {
        return -1;
      }
    }
 
    $memoryid = session_name().'_'.$memoryid;
    //$m->setOption(Memcached::OPT_COMPRESSION, false);
    $data = $m->get($memoryid);
    //print "memoryid=".$memoryid." - rescode=".$rescode." - data=".count($data)."\n<br>";
    //var_dump($data);
    if ($data) {
      return $data;
    } else {
      return null; // There is no way to make a difference between NOTFOUND and error when using Memcache. So do not use it, use Memcached instead.
    }
  } elseif (isset($conf->global->MAIN_OPTIMIZE_SPEED) && ($conf->global->MAIN_OPTIMIZE_SPEED & 0x02)) { // This is a really not reliable cache ! Use Memcached instead.
    // Using shmop
    $data = dol_getshmop($memoryid);
    return $data;
  }
 
  return null;
}
 
 
 
function dol_getshmopaddress($memoryid)
{
  global $shmkeys, $shmoffset;
  if (empty($shmkeys[$memoryid])) { // No room reserved for thid memoryid, no way to use cache
    return 0;
  }
  return $shmkeys[$memoryid] + $shmoffset;
}
 
function dol_listshmop()
{
  global $shmkeys, $shmoffset;
 
  $resarray = array();
  foreach ($shmkeys as $key => $val) {
    $result = dol_getshmop($key);
    if (!is_numeric($result) || $result > 0) {
      $resarray[$key] = $result;
    }
  }
  return $resarray;
}
 
function dol_setshmop($memoryid, $data, $expire)
{
  global $shmkeys, $shmoffset;
 
  //print 'dol_setshmop memoryid='.$memoryid."<br>\n";
  if (empty($shmkeys[$memoryid]) || !function_exists("shmop_write")) {
    return 0;
  }
  $shmkey = dol_getshmopaddress($memoryid);
  if (empty($shmkey)) {
    return 0; // No key reserved for this memoryid, we can't cache this memoryid
  }
 
  $newdata = serialize($data);
  $size = strlen($newdata);
  //print 'dol_setshmop memoryid='.$memoryid." shmkey=".$shmkey." newdata=".$size."bytes<br>\n";
  $handle = shmop_open($shmkey, 'c', 0644, 6 + $size);
  if ($handle) {
    $shm_bytes_written1 = shmop_write($handle, str_pad($size, 6), 0);
    $shm_bytes_written2 = shmop_write($handle, $newdata, 6);
    if (($shm_bytes_written1 + $shm_bytes_written2) != (6 + dol_strlen($newdata))) {
      print "Couldn't write the entire length of data\n";
    }
    shmop_close($handle);
    return ($shm_bytes_written1 + $shm_bytes_written2);
  } else {
    print 'Error in shmop_open for memoryid='.$memoryid.' shmkey='.$shmkey.' 6+size=6+'.$size;
    return -1;
  }
}
 
function dol_getshmop($memoryid)
{
  global $shmkeys, $shmoffset;
 
  $data = null;
 
  if (empty($shmkeys[$memoryid]) || !function_exists("shmop_open")) {
    return null;
  }
  $shmkey = dol_getshmopaddress($memoryid);
  if (empty($shmkey)) {
    return null; // No key reserved for this memoryid, we can't cache this memoryid
  }
 
  //print 'dol_getshmop memoryid='.$memoryid." shmkey=".$shmkey."<br>\n";
  $handle = @shmop_open($shmkey, 'a', 0, 0);
  if ($handle) {
    $size = trim(shmop_read($handle, 0, 6));
    if ($size) {
      $data = unserialize(shmop_read($handle, 6, $size));
    } else {
      return -1;
    }
    shmop_close($handle);
  } else {
    return null; // Can't open existing block, so we suppose it was not created, so nothing were cached yet for the memoryid
  }
  return $data;
}