PHP responding to ajax when running a long script

Question

I've asked a question at here that answered and working fine,

but my problem is that when script running about more than 4~5 seconds , all ajax requests not working at all until completing running script .

In fact I've using a progress to copy files and when I choose a large file , after 30% process the ajax not working to get percentage of progress .

If you check my question , you will understand what I've saying .

Copy.php

$f = mysql_query(" select * from `process` ");
$f = mysql_fetch_assoc($f);
$total_bytes_readed = $f['total-bytes-readed'];
$total_bytes = $f['total-bytes'];
$abort = $f['state'] == 'abort'?true:false;
$remote = fopen($src, 'r');
$local = fopen($des, 'w');
$filesize = filesize($src);
$d = strtotime(date('Y-m-d H:i:s'));
$B = $speed = $time_remaining = $read_bytes = 0;

while(!feof($remote) && !$abort) {

    $field = mysql_query(" select * from `process` ");
    $field = mysql_fetch_assoc($field);
    if($field['state']=='abort')
    {
        fclose($remote);
        fclose($local);
        if(file_exists($des))
        unlink($des);
        $abort = true;
        return;
    }else{
        $bitrate = 2048*2048;
        $buffer = fread($remote, $bitrate);
        fwrite($local, $buffer);
        $read_bytes += $bitrate ;
        $total_bytes_readed += $bitrate;
        $D = strtotime(date('Y-m-d H:i:s'));        
        if($D-$d >=1)
        {
            $d = $D;
            $speed = $read_bytes - $B;
            $B = $read_bytes;
            $total_bytes_remaining = $total_bytes - $total_bytes_readed;
            $time_remaining = $total_bytes_remaining/$speed;
        }
        mysql_query("UPDATE `process` SET 
                    `total-bytes-readed` = '$total_bytes_readed',
                    `speed` = '$speed',
                    `time-remaining` = '$time_remaining' 
                     WHERE `process`.`id` =1");         
    }
}
fclose($remote);
fclose($local);
mysql_query("UPDATE `process` SET 
            `total-bytes-readed` = '$total_bytes_readed',
            `speed` = '$speed',
            `time-remaining` = '$time_remaining' 
             WHERE `process`.`id` =1");

progress.php

if(isset($_POST['cancel']) && $_POST['cancel']==1)
mysql_query("UPDATE `process` SET `state` = 'abort' WHERE `process`.`id` =1");  

$f = mysql_query(" select * from `process` ");
$f = mysql_fetch_assoc($f);

$re = array('totalfiles'  => $f['total-files'],
            'totalbytes'  => $f['total-bytes'],
            'bytesreaded' => $f['total-bytes-readed'],
            'file'        => $f['file'],
            'from'        => $f['from'],
            'to'          => $f['to'],
            'speed'       => ByteToSize($f['speed'])."/Second",
            'time'        => seconds_to_time($f['time-remaining']),
            'items'       => $f['items-remaining'],
            'state'       => $f['state'],
            );
echo json_encode($re);

JS

setInterval(function(){
    $.post( progress.php,{cancel:cancel_val},
    function(data){
       //...        
    }); 
},300);

in your browser what are the XHR requests returning when it starts to fail? is your copy script hitting it's max execution time, or running out of memory? what do your php error logs say? — cmorrissey, Oct 22 '14 at 15:57
Possibly the same problem as http://stackoverflow.com/questions/25675304/php-site-is-waiting-on-ajax-calls-to-complete/25675688#25675688, i.e you need to use session_write_close — developerwjk, Oct 22 '14 at 16:02

score 0 · Answer 1 · answered Oct 22 '14 at 16:04

0

Without seeing it in action, I would guess that the problem is that you have multiple ajax requests that are overlapping.

Instead of using an setInterval, you should set use a setTimeout in the success function of your ajax call. That way you ensure that there is always only 1 ajax request at most at the same time.

So your javascript would be something like:

function updateProgress() {
    $.post( progress.php,{cancel:cancel_val},
    function(data){
       //... 
       setTimeout(updateProgress, 300);      
    }); 
};

updateProgress();

answered Oct 22 '14 at 16:04

jeroen

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@Damon.s Any messages in the console? – jeroen Oct 22 '14 at 16:25
anythings not working , for example liking posts or comments in other posts because of ajax ... – talkhabi Oct 22 '14 at 16:45
@Damon.s Sounds like a syntax error somewhere, check the console. – jeroen Oct 22 '14 at 16:56
nope . I'm sure about this . code running for a few seconds then stop and when copying has been completed the result shown . – talkhabi Oct 22 '14 at 16:59
@Damon.s Are you using sessions? – jeroen Oct 22 '14 at 17:01

PHP responding to ajax when running a long script

1 Answers1