<?php
set_time_limit(0);
ignore_user_abort(true);
// this file wants to simulate a real large process that have to be executed in background
require_once __DIR__.'/../../vendor/autoload.php';
use JLaso\ToolsLib\Json;
use JLaso\ToolsLib\Status;
$id = isset($_POST['id']) ? $_POST['id'] : null;
$fileName = isset($_POST['name']) ? $_POST['name'] : "";
$fileSize = isset($_POST['size']) ? $_POST['size'] : "";
if ((null === $id) || !$fileName || !$fileSize) {
Json::error("you have to send 'id','name' and 'size' to start processing");
exit();
}
$status = new Status($_POST["_task"]);
// if the status file exists means that another instance of this task is working
if ($status->existsStatusFile()) {
Json::ok(array('id'=>$id, 'status'=>Status::QUEUED));
exit();
}
$status->touchStatusFile();
// the next lines terminates the output buffer and let believe the requester that the program had finished
ob_start();
Json::ok();
header("Content-Length: ".ob_get_length());
header('Connection: close');
ob_end_flush();
flush();
session_write_close();
// wait a little before the huge work
sleep(1);
// this is some kind of magic, in order to copy the status file if something wrong happens
function master_shutdown()
{
global $status;
$status->hangOn();
}
register_shutdown_function('master_shutdown');
$tasks = array();
do {
// get the first task in the queue
if (!$id){
foreach($tasks as $key=>$task){
$id = $key;
break;
}
}
if ($status->getInfo($id) != Status::DONE) {
$status->updateStatus($id, Status::PROCESSING);
process($status, $id, $fileName, $fileSize);
$status->updateStatus($id, Status::DONE);
}
// continue while existing pending tasks
$id = null;
$tasks = $status->getNotDoneTasks();
} while(count($tasks));
sleep(2); // give time to frontend to recover updated status
// frees status file indicating that this process has been terminated
$status->freeStatusFile();
function process(Status $status, $id, $name, $size)
{
$factor = intval($size/100);
for($i=0;$i<=$size;$i+=$factor){
usleep(100000); // simulate that is copying a piece of the file
$status->updateStatus($id, Status::PROCESSING.":".intval($i/$factor));
}
sleep(1);
$status->updateStatus($id, Status::DONE);
sleep(2);
}
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