PHP Classes

File: src/Starter.php

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  Classes of Joseluis Laso  >  Asynchronous Long Server Tasks  >  src/Starter.php  >  Download  
File: src/Starter.php
Role: Class source
Content type: text/plain
Description: Class source
Class: Asynchronous Long Server Tasks
Start background tasks and query progress status
Author: By
Last change: fixing locking of status file in order to prevent concurrent R/W
Date: 7 years ago
Size: 2,875 bytes
 

Contents

Class file image Download
<?php

namespace JLaso\ToolsLib;


/**
 * Class Starter
 *
 * based on the article https://segment.com/blog/how-to-make-async-requests-in-php/ of Calvin French-Owen
 */

class Starter extends CommonAbstract
{
    const
SUCCESS = 1;
    const
STARTED_ALREADY = 2;
    const
ERROR = 2;
    const
ERROR_ID = 3;

   
/** @var String */
   
protected $url;
   
/** @var String */
   
protected $host;
   
/** @var int */
   
protected $port;
   
/** @var String */
   
protected $lastError;

   
/**
     * Starter constructor.
     * @param string $url
     * @param string $task
     * @param bool $debug
     * @throws Exception
     * @internal param mixed $data
     */
   
public function __construct($url, $task, $debug = false)
    {
       
parent::__construct($task, $debug);
        if (
strpos($url, "http://") !== 0) {
           
$url = "http://" . $_SERVER["SERVER_NAME"] . "/" . $url;
        }
        if (!
preg_match("~(?<host>http[s]?:\/\/[^\/|^:]+)(?<port>:\d+)?(?<url>\/.*)$~i", $url, $matches)) {
            throw new
Exception("The url passed doesn't match http://host:port/url");
        };
       
$this->host = isset($matches["host"]) ? $matches["host"] : "http://localhost";
       
$this->url = isset($matches["url"]) ? $matches["url"] : "/";
       
$this->port = isset($matches["port"]) && !empty($matches["port"]) ? $matches["port"] : (stripos($this->host, "https") === 0 ? "443" : "80");
       
$this->host = preg_replace("~^http[s]?://~", "", $this->host);
    }

   
/**
     * invoke the task though an http request in order to end quickly and return the control
     * to the requester, then call periodically to status script in order to know how is going
     *
     * @param array $data payload to the request
     * @return integer
     */
   
public function invoke($data = array())
    {
        if (!isset(
$data['id'])) {
            return
self::ERROR_ID;
        }
       
$data["_task"] = $this->task;
       
$unique = ((strstr($this->url, "?") === false) ? "?" : "&") . "_nc=" . date("U");

       
$payload = http_build_query($data);
       
$fp = fsockopen($this->host, $this->port, $errno, $errstr, 30);

        if (!
$fp) {

           
$this->lastError = "$errstr ($errno)";

            return
self::ERROR;

        } else {

           
$out = "POST " . $this->url . $unique . " HTTP/1.1\r\n";
           
$out .= "Host: {$this->host}\r\n";
           
$out .= "Content-Type: application/x-www-form-urlencoded\r\n";
           
$out .= "Content-Length: " . strlen($payload) . "\r\n";
           
$out .= "Connection: Close\r\n";
           
$out .= "\r\n";
           
fwrite($fp, $out);
           
fwrite($fp, $payload);
           
fclose($fp);

        }

        return
self::SUCCESS;
    }

   
/**
     * @return String
     */
   
public function getLastError()
    {
        return
$this->lastError;
    }



}