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egroupware/api/src/Asyncservice.php

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move asyncservices class to api
2016-04-06 21:27:47 +02:00
<?php
/**
* EGroupware API - Timed Asynchron Services
*
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @copyright Ralf Becker <RalfBecker-AT-outdoor-training.de>
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package api
* @access public
* @version $Id$
*/
namespace EGroupware\Api;
/**
* The class implements a general eGW service to execute callbacks at a given time.
*
* see http://www.egroupware.org/wiki/TimedAsyncServices
*/
class Asyncservice
{
var $php = '';
var $crontab = '';
/**
* Our instance of the db-class
*
* @var Db
*/
var $db;
var $db_table = 'egw_async';
var $debug = 0;
/**
* Line in crontab set by constructor with absolute path
*/
var $cronline = '/api/asyncservices.php default';
/**
* constructor of the class
*/
function __construct()
{
if (is_object($GLOBALS['egw']->db))
{
$this->db = $GLOBALS['egw']->db;
}
else
{
$this->db = $GLOBALS['egw_setup']->db;
}
$this->cronline = EGW_SERVER_ROOT . '/api/asyncservices.php '.$GLOBALS['egw_info']['user']['domain'];
$this->only_fallback = substr(php_uname(), 0, 7) == "Windows"; // atm cron-jobs dont work on win
}
/**
* calculates the next run of the timer and puts that with the rest of the data in the db for later execution.
*
* @param int/array $times unix timestamp or array('min','hour','dow','day','month','year') with execution time.
* Repeated events are possible to shedule by setting the array only partly, eg.
* array('day' => 1) for first day in each month 0am or array('min' => '* /5', 'hour' => '9-17')
* for every 5mins in the time from 9am to 5pm.
* @param string $id unique id to cancel the request later, if necessary. Should be in a form like
* eg. '<app><id>X' where id is the internal id of app and X might indicate the action.
* @param string $method Method to be called via ExecMethod($method,$data). $method has the form
* '<app>.<class>.<public function>'.
* @param mixed $data =null This data is passed back when the method is called. If it is an array,
* EGroupware will add the rest of the job parameters like id, next (sheduled exec time), times, ...
* @param int $account_id account_id, under which the methode should be called or False for the actual user
* @param boolean $debug =false
* @return boolean False if $id already exists, else True
*/
function set_timer($times,$id,$method,$data=null,$account_id=False,$debug=false)
{
if (empty($id) || empty($method) || $this->read($id) ||
!($next = $this->next_run($times,$debug)))
{
return False;
}
if ($account_id === False)
{
$account_id = $GLOBALS['egw_info']['user']['account_id'];
}
$job = array(
'id' => $id,
'next' => $next,
'times' => $times,
'method' => $method,
'data' => $data,
'account_id' => $account_id
);
$this->write($job);
return True;
}
/**
* calculates the next execution time for $times
*
* @param int/array $times unix timestamp or array('year'=>$year,'month'=>$month,'dow'=>$dow,'day'=>$day,'hour'=>$hour,'min'=>$min)
* with execution time. Repeated execution is possible to shedule by setting the array only partly,
* eg. array('day' => 1) for first day in each month 0am or array('min' => '/5', 'hour' => '9-17')
* for every 5mins in the time from 9am to 5pm. All not set units before the smallest one set,
* are taken into account as every possible value, all after as the smallest possible value.
* @param boolean $debug if True some debug-messages about syntax-errors in $times are echoed
* @param int $now Use this time to calculate then next run from. Defaults to time().
* @return int a unix timestamp of the next execution time or False if no more executions
*/
function next_run($times,$debug=False, $now = null)
{
if ($this->debug)
{
echo "<p>next_run("; print_r($times); echo ",'$debug', " . date('Y-m-d H:i', $now) . ")</p>\n";
$debug = True; // enable syntax-error messages too
}
if(is_null($now)) {
$now = time();
}
// $times is unix timestamp => if it's not expired return it, else False
//
if (!is_array($times))
{
$next = (int)$times;
return $next > $now ? $next : False;
}
// If an array is given, we have to enumerate the possible times first
//
$units = array(
'year' => 'Y',
'month' => 'm',
'day' => 'd',
'dow' => 'w',
'hour' => 'H',
'min' => 'i'
);
$max_unit = array(
'min' => 59,
'hour' => 23,
'dow' => 6,
'day' => 31,
'month' => 12,
'year' => date('Y')+10 // else */[0-9] would never stop returning numbers
);
$min_unit = array(
'min' => 0,
'hour' => 0,
'dow' => 0,
'day' => 1,
'month' => 1,
'year' => date('Y')
);
// get the number of the first and last pattern set in $times,
// as empty patterns get enumerated before the the last pattern and
// get set to the minimum after
//
$i = $first_set = $last_set = 0;
foreach($units as $u => $date_pattern)
{
++$i;
if (isset($times[$u]))
{
$last_set = $i;
if (!$first_set)
{
$first_set = $i;
}
}
}
// now we go through all units and enumerate all patterns and not set patterns
// (as descript above), enumerations are arrays with unit-values as keys
//
$n = 0;
foreach($units as $u => $date_pattern)
{
++$n;
if ($this->debug) { echo "<p>n=$n, $u: isset(times[$u]="; print_r($times[$u]); echo ")=".(isset($times[$u])?'True':'False')."</p>\n"; }
if (isset($times[$u]))
{
if(is_array($times[$u])) {
$time = array_keys($times[$u]);
} else {
$time = explode(',',$times[$u]);
}
$times[$u] = array();
foreach($time as $t)
{
if (strpos($t,'-') !== False && strpos($t,'/') === False)
{
list($min,$max) = $arr = explode('-',$t);
if (count($arr) != 2 || !is_numeric($min) || !is_numeric($max) || $min > $max)
{
if ($debug) echo "<p>Syntax error in $u='$t', allowed is 'min-max', min <= max, min='$min', max='$max'</p>\n";
return False;
}
for ($i = (int)$min; $i <= $max; ++$i)
{
$times[$u][$i] = True;
}
}
else
{
if ((string)$t == '*') $t = '*/1';
list($one,$inc) = $arr = explode('/',$t);
if (!(is_numeric($one) && count($arr) == 1 ||
count($arr) == 2 && is_numeric($inc)))
{
if ($debug) echo "<p>Syntax error in $u='$t', allowed is a number or '{*|range}/inc', inc='$inc'</p>\n";
return False;
}
if (count($arr) == 1)
{
$times[$u][(int)$one] = True;
}
else
{
list($min,$max) = $arr = explode('-',$one);
if (empty($one) || $one == '*')
{
$min = $min_unit[$u];
$max = $max_unit[$u];
}
elseif (count($arr) != 2 || $min > $max)
{
if ($debug) echo "<p>Syntax error in $u='$t', allowed is '{*|min-max}/inc', min='$min',max='$max', inc='$inc'</p>\n";
return False;
}
for ($i = $min; $i <= $max; $i += $inc)
{
$times[$u][$i] = True;
}
}
}
}
}
elseif ($n < $last_set || $u == 'dow') // before last value set (or dow) => empty gets enumerated
{
for ($i = $min_unit[$u]; $i <= $max_unit[$u]; ++$i)
{
$times[$u][$i] = True;
}
}
else // => after last value set => empty is min-value
{
$times[$u][$min_unit[$u]] = True;
}
}
if ($this->debug) { echo "enumerated times=<pre>"; print_r($times); echo "</pre>\n"; }
// now we have the times enumerated, lets find the first not expired one
//
$found = array();
$over = null;
while (!isset($found['min']))
{
$future = False;
foreach($units as $u => $date_pattern)
{
$unit_now = $u != 'dow' ? (int)date($date_pattern, $now) :
(int)date($date_pattern,mktime(12,0,0,$found['month'],$found['day'],$found['year']));
if (isset($found[$u]))
{
$future = $future || $found[$u] > $unit_now;
if ($this->debug) echo "--> already have a $u = ".$found[$u].", future='$future'<br>\n";
continue; // already set
}
foreach(array_keys($times[$u]) as $unit_value)
{
switch($u)
{
case 'dow':
$valid = $unit_value == $unit_now;
break;
case 'min':
$valid = $future || $unit_value > $unit_now;
break;
default:
$valid = $future || $unit_value >= $unit_now;
break;
}
if ($valid && ($u != $next || $unit_value > $over)) // valid and not over
{
$found[$u] = $unit_value;
$future = $future || $unit_value > $unit_now;
break;
}
}
if (!isset($found[$u])) // we have to try the next one, if it exists
{
$nexts = array_keys($units);
if (!isset($nexts[count($found)-1]))
{
if ($this->debug) echo "<p>Nothing found, exiting !!!</p>\n";
return False;
}
$next = $nexts[count($found)-1];
$over = $found[$next];
unset($found[$next]);
if ($this->debug) echo "<p>Have to try the next $next, $u's are over for $next=$over !!!</p>\n";
break;
}
}
}
if ($this->debug) { echo "<p>next="; print_r($found); echo "</p>\n"; }
return mktime($found['hour'],$found['min'],0,$found['month'],$found['day'],$found['year']);
}
/**
* cancels a timer
*
* @param string $id has to be the one used to set it.
* @return boolean True if the timer exists and is not expired.
*/
function cancel_timer($id)
{
return $this->delete($id);
}
/**
* checks when the last check_run was run or set the run-semaphore (async_next != 0) if $semaphore == True
*
* @param boolean $semaphore if False only check, if true try to set/release the semaphore
* @param boolean $release if $semaphore == True, tells if we should set or release the semaphore
* @return mixed if !$set array('start' => $start,'end' => $end) with timestamps of last check_run start and end, \
* !$end means check_run is just running. If $set returns True if it was able to get the semaphore, else False
*/
function last_check_run($semaphore=False,$release=False,$run_by='')
{
//echo "<p>last_check_run(semaphore=".($semaphore?'True':'False').",release=".($release?'True':'False').")</p>\n";
if (($exists = $this->read('##last-check-run##')))
{
list(,$last_run) = each($exists);
}
//echo "last_run (from db)=<pre>"; print_r($last_run); echo "</pre>\n";
if (!$semaphore)
{
return $last_run['data'];
}
$where = array();
if ($release)
{
$last_run['next'] = 0;
$last_run['data']['end'] = time();
}
else
{
@set_time_limit(0); // dont stop for an execution-time-limit
ignore_user_abort(True);
$last_run = array(
'id' => '##last-check-run##',
'next' => time(),
'times' => array(),
'method' => 'none',
'data' => array(
'run_by'=> $run_by,
'start' => time(),
'end' => 0
)
);
// as the async_next column is used as a semaphore we only update it,
// if it is 0 (semaphore released) or older then 10min to recover from failed or crashed attempts
if ($exists) $where = array('async_next=0 OR async_next<'.(time()-600));
}
//echo "last_run=<pre>"; print_r($last_run); echo "</pre>\n";
return $this->write($last_run, !!$exists, $where) > 0;
}
/**
* checks if there are any jobs ready to run (timer expired) and executes them
*/
function check_run($run_by='')
{
if ($run_by === 'fallback') flush();
if (!$this->last_check_run(True,False,$run_by))
{
return False; // cant obtain semaphore
}
// mark enviroment as async-service, check with isset()!
$GLOBALS['egw_info']['flags']['async-service'] = $run_by;
if (($jobs = $this->read()))
{
foreach($jobs as $job)
{
// checking / setting up egw_info/user
//
if ($GLOBALS['egw_info']['user']['account_id'] != $job['account_id'])
{
// run notifications, before changing account_id of enviroment
Link::run_notifies();
// unset all objects in $GLOBALS, which are created and used by ExecMethod, as they can contain user-data
foreach($GLOBALS as $name => $value)
{
if ($name !== 'egw' && is_object($value)) unset($GLOBALS[$name]);
}
$domain = $GLOBALS['egw_info']['user']['domain'];
$lang = $GLOBALS['egw_info']['user']['preferences']['common']['lang'];
unset($GLOBALS['egw_info']['user']);
if (($GLOBALS['egw']->session->account_id = $job['account_id']))
{
$GLOBALS['egw']->session->account_lid = $GLOBALS['egw']->accounts->id2name($job['account_id']);
$GLOBALS['egw']->session->account_domain = $domain;
$GLOBALS['egw_info']['user'] = $GLOBALS['egw']->session->read_repositories();
if ($lang != $GLOBALS['egw_info']['user']['preferences']['common']['lang'])
{
Translation::init();
}
// set VFS user for vfs access rights
Vfs::$user = $job['account_id'];
Vfs::clearstatcache();
}
else
{
$GLOBALS['egw_info']['user']['domain'] = $domain;
}
}
list($app) = strpos($job['method'],'::') !== false ? explode('_',$job['method']) :
explode('.',$job['method']);
Translation::add_app($app);
if (is_array($job['data']))
{
$job['data'] += array_diff_key($job,array('data' => false));
}
// update job before running it, to cope with jobs taking longer then async-frequency
if (($job['next'] = $this->next_run($job['times'])))
{
$this->write($job, True);
}
else // no further runs
{
$this->delete($job['id']);
}
try
{
ExecMethod($job['method'],$job['data']);
}
catch(Exception $e)
{
// log the exception to error_log, but continue running other async jobs
_egw_log_exception($e);
}
}
}
$this->last_check_run(True,True,$run_by); // release semaphore
return $jobs ? count($jobs) : 0;
}
/**
* reads all matching db-rows / jobs
*
* @param string $id =0 reads all expired rows / jobs ready to run\
* != 0 reads all rows/jobs matching $id (sql-wildcards '%' and '_' can be used)
* @param array|string $cols ='*' string or array of column-names / select-expressions
* @param int|bool $offset =False offset for a limited query or False (default)
* @param string $append ='ORDER BY async_next' string to append to the end of the query
* @param int $num_rows =0 number of rows to return if offset set, default 0 = use default in user prefs
* @return array/boolean db-rows / jobs as array or False if no matches
*/
function read($id=0,$cols='*',$offset=False,$append='ORDER BY async_next',$num_rows=0)
{
if (!is_a($this->db, 'Db')) return false;
if ($id === '%')
{
$where = "async_id != '##last-check-run##'";
}
elseif (!is_array($id) && (strpos($id,'%') !== False || strpos($id,'_') !== False))
{
$id = $this->db->quote($id);
$where = "async_id LIKE $id AND async_id != '##last-check-run##'";
}
elseif (!$id)
{
$where = 'async_next <= '.time()." AND async_id != '##last-check-run##'";
}
else
{
$where = array('async_id' => $id);
}
$jobs = array();
foreach($this->db->select($this->db_table,$cols,$where,__LINE__,__FILE__,$offset,$append,False,$num_rows) as $row)
{
$row['async_times'] = json_php_unserialize($row['async_times']);
// check for broken value during migration
if ($row['async_data'][0] == '"' && substr($row['async_data'], 0, 7) == '"\\"\\\\\\"')
{
$row['async_data'] = null;
$this->write(Db::strip_array_keys($row,'async_'), true);
}
else
{
$row['async_data'] = !empty($row['async_data']) ?
json_php_unserialize($row['async_data'], true) : null; // allow non-serialized data
}
$jobs[$row['async_id']] = Db::strip_array_keys($row,'async_');
}
if (!count($jobs))
{
return False;
}
return $jobs;
}
/**
* write a job / db-row to the db
*
* @param array $job db-row as array
* @param boolean $exists if True, we do an update, else we check if update or insert necesary
* @param array $where additional where statemetn to update only if a certain condition is met, used for the semaphore
* @return int affected rows, can be 0 if an additional where statement is given
*/
function write($job, $exists = False, $where=array())
{
if (!is_a($this->db, 'Db')) return 0;
if (is_array($job['data']) && isset($job['data']['next']) && isset($job['next'])) $job['data']['next'] = $job['next'];
$data = array(
'async_next' => $job['next'],
'async_times' => json_encode($job['times']),
'async_method' => $job['method'],
'async_data' => $job['data'] ? json_encode($job['data']) : '',
'async_account_id'=> $job['account_id'],
);
$where['async_id'] = $job['id'];
if ($exists)
{
$this->db->update($this->db_table, $data, $where, __LINE__, __FILE__);
}
else
{
$this->db->insert($this->db_table, $data, $where, __LINE__, __FILE__);
}
return $this->db->affected_rows();
}
/**
* delete db-row / job with $id
*
* @return boolean False if $id not found else True
*/
function delete($id)
{
$this->db->delete($this->db_table,array('async_id' => $id),__LINE__,__FILE__);
return $this->db->affected_rows();
}
function find_binarys()
{
static $run = False;
if ($run)
{
return;
}
else
{
$run = True;
}
if (substr(php_uname(), 0, 7) == "Windows")
{
// ToDo: find php-cgi on windows
}
else
{
$binarys = array(
'php' => '/usr/bin/php',
'php5' => '/usr/bin/php5', // SuSE 9.3 with php5
'crontab' => '/usr/bin/crontab'
);
foreach ($binarys as $name => $path)
{
$this->$name = $path; // a reasonable default for *nix
if (!($Ok = @is_executable($this->$name)))
{
if (file_exists($this->$name))
{
echo '<p>'.lang('%1 is not executable by the webserver !!!',$this->$name)."</p>\n";
$perms = fileperms($this->$name);
if (!($perms & 0x0001) && ($perms & 0x0008) && function_exists('posix_getuid')) // only executable by group
{
$group = posix_getgrgid(filegroup($this->$name));
$webserver = posix_getpwuid(posix_getuid ());
echo '<p>'.lang("You need to add the webserver user '%1' to the group '%2'.",$webserver['name'],$group['name'])."</p>\n"; }
}
if (($fd = popen('/bin/sh -c "type -p '.$name.'"','r')))
{
$this->$name = fgets($fd,256);
@pclose($fd);
}
if (($pos = strpos($this->$name,"\n")))
{
$this->$name = substr($this->$name,0,$pos);
}
}
if (!$Ok && !@is_executable($this->$name))
{
$this->$name = $name; // hopefully its in the path
}
//echo "<p>$name = '".$this->$name."'</p>\n";
}
if ($this->php5[0] == '/') // we found a php5 binary
{
$this->php = $this->php5;
}
}
}
/**
* checks if phpgwapi/cron/asyncservices.php is installed as cron-job
*
* @return array the times asyncservices are run (normaly 'min'=>'* /5') or False if not installed or 0 if crontab not found
* Not implemented for Windows at the moment, always returns 0
*/
function installed()
{
if ($this->only_fallback) {
return 0;
}
$this->find_binarys();
if (!is_executable($this->crontab))
{
//echo "<p>Error: $this->crontab not found !!!</p>";
return 0;
}
$times = False;
$this->other_cronlines = array();
if (($crontab = popen('/bin/sh -c "'.$this->crontab.' -l" 2>&1','r')) !== False)
{
$n = 0;
while ($line = fgets($crontab,256))
{
if ($this->debug) echo 'line '.++$n.": $line<br>\n";
$parts = explode(' ',$line,6);
if ($line{0} == '#' || count($parts) < 6 || ($parts[5]{0} != '/' && substr($parts[5],0,3) != 'php'))
{
// ignore comments
if ($line{0} != '#')
{
$times['error'] .= $line;
}
}
elseif (strpos($line,$this->cronline) !== False ||
// also check of old phpgwapi/cron path
strpos($line, str_replace('/api/', '/phpgwapi/cron/', $this->cronline)) !== False)
{
$cron_units = array('min','hour','day','month','dow');
foreach($cron_units as $n => $u)
{
$times[$u] = $parts[$n];
}
$times['cronline'] = $line;
}
else
{
$this->other_cronlines[] = $line;
}
}
@pclose($crontab);
}
return $times;
}
/**
* installs /phpgwapi/cron/asyncservices.php as cron-job
*
* Not implemented for Windows at the moment, always returns 0
*
* @param array $times array with keys 'min','hour','day','month','dow', not set is equal to '*'.
* False means de-install our own crontab line
* @return mixed the times asyncservices are run, False if they are not installed,
* 0 if crontab not found and ' ' if crontab is deinstalled
*/
function install($times)
{
if ($this->only_fallback && $times !== False) {
return 0;
}
$this->installed(); // find other installed cronlines
if (($crontab = popen('/bin/sh -c "'.$this->crontab.' -" 2>&1','w')) !== False)
{
if (is_array($this->other_cronlines))
{
foreach ($this->other_cronlines as $cronline)
{
fwrite($crontab,$cronline); // preserv the other lines on install
}
}
if ($times !== False)
{
$cron_units = array('min','hour','day','month','dow');
$cronline = '';
foreach($cron_units as $cu)
{
$cronline .= (isset($times[$cu]) ? $times[$cu] : '*') . ' ';
}
// -d memory_limit=-1 --> no memory limit
$cronline .= $this->php.' -q -d memory_limit=-1 '.$this->cronline."\n";
//echo "<p>Installing: '$cronline'</p>\n";
fwrite($crontab,$cronline);
}
@pclose($crontab);
}
return $times !== False ? $this->installed() : ' ';
}
}
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