I have some PHP script where I invoke method from the external class. I want to run this method asynchronously. I don't want to block rest of the program. This method does some work in the background and return nothing so there is no need to wait while it finished. Is there a way to do this in PHP?
# get post data from user
$postData = $this->f3->get('POST');
# start of asynchronous part
$obj = new asyncClass();
$obj->init($postData);
# end of asynchronous part
# do some work with post data
$soc = new someOtherClass($postData);
$result = $soc->send();
# assign result of work to variable
$this->f3->set('var', $result);
# show it to user
$this->f3->set('view', 'view.html');
If this can help, I'm using Fat Free Framework and PHP 5.6 Non-Thread Safe
You can use $f3->abort() to send the output/response to the browser and process your other blocking function afterwards. That's not a real asynchron solution but would work. You could also use something like php-icicle to add threads support, but that maybe requires some other php modules being installed.
Use threading.
class PostDataHandlerAsync extends Thread
{
private $postData
public function __construct($postData)
{
$this->postData = $postData;
}
public function run()
{
/*
Your code goes here
*/
}
}
$postData = $this->f3->get('POST');
$obj = new PostDataHandlerAsync($postData);
$obj->run();
Related
I played around with the PHP 7.2 runtime and HTTP trigger on Alibaba Cloud Function Compute. The basic example in the documentation is the following:
<? php
use RingCentral\Psr7\Response;
function handler($request, $context): Response{
/*
$body = $request->getBody()->getContents();
$queries = $request->getQueryParams();
$method = $request->getMethod();
$headers = $request->getHeaders();
$path = $request->getAttribute("path");
$requestURI = $request->getAttribute("requestURI");
$clientIP = $request->getAttribute("clientIP");
*/
return new Response(
200,
array(
"custom_header1" => "v1"
),
"hello world"
);
}
This works quite well. It's easy to get the query parameters from an URL. But the body content is only available in a whole string with
$request->getBody()->getContents();
Although the documentation says that the $request parameter follows the PSR-7 HTTP Message standard, it is not possible to use $request->getParsedBody() to deliver the values submitted by POST method. It didn't work as expected - the result remains empty.
The reason is the underlying technology. Alibaba Cloud Function Compute makes use of the event-driven React PHP library to handle the requests (you can check this by analyzing the $request object). So the $_POST array is empty and there is no "easy way to get POST data".
Luckily, Alibaba's Function Compute handler provides the body content by $request->getBody()->getContents(); as a string like
"bar=lala&foo=bar"
So a solution seems easiser than thought at the beginning, you can e.g. use PHP's own parse_str() function:
$data = [];
$body = $request->getBody()->getContents();
parse_str($body,$data);
If you place this snippet in the handler function, the POST variables are stored in the $data array and ready for further processing.
Hope that this helps somebody who asked the same questions than I. :-)
Kind regards,
Ralf
As you can see in the documentation you need to add a RequestBodyParserMiddleware as middleware to get a parsed PSR-7 request. It seems you didn't do that.
Also keep in mind that only the Content-Types: application/x-www-form-urlencoded and multipart/form-data are supported here. So make sure the client need to send these headers so the request can be parsed. If it's another Content-Type you need to use another middleware.
See: https://github.com/reactphp/http#requestbodyparsermiddleware for more information.
I hope this helps!
#legionth: I apologize that I didn't use the comment feature here, but my answer is too long. :-)
Thanks a lot for your comments - the usage of RequestBodyParserMiddleware is a great solution if you can control the server code. But in the context of Alibaba Cloud Function Compute service this seems not possible. I tried to find out more information about the invocation process - here are my results:
Function Compute makes use of the Docker image defined in https://github.com/aliyun/fc-docker/blob/master/php7.2/run/Dockerfile .
In the build process they download a PHP runtime environment from https://my-fc-testt.oss-cn-shanghai.aliyuncs.com/php7.2.tgz . (I didn't find this on GitHub, but the code is public downloadable.)
A shell script start_server.sh starts a PHP-CGI binary and runs a PHP script server.php.
In server.php a React\Http\Server is started by:
$server = new Server(function (ServerRequestInterface $request) {
[...]
});
[...]
$socket = new \React\Socket\Server(sprintf('0.0.0.0:%s', $port), $loop);
$server->listen($socket);
$loop->run();
As seen in the Function Compute documentation (& example of FC console), I can only use two functions:
/*
if you open the initializer feature, please implement the initializer function, as below:
*/
function initializer($context) {
}
and the handler function you can find in my first post.
Maybe Alibaba will extend the PHP runtime in future to make it possible to use a custom middleware, but currently I didn't find a way to do this.
Thanks again & kind regards,
Ralf
Background: I've been drafted to maintain and update a flash/flex/as3 front-end to website using php on the backend. I'm getting better at it, but I'm still new to the environment.
I need some processed information received back in the return handler of a POST. I thought it would be clever to do the next POST within the return handler. In other words, I've got something like this:
private function finishThis():void
{
var s:HTTPService = new HTTPService();
rq.action = "do_something";
s.url = "inc/php/test.php";
s.method = "POST";
s.request = rq;
s.requestTimeout = 120000;
s.addEventListener(ResultEvent.RESULT, doSomethingRH);
s.send();
s.disconnect(); // That's a test, it didn't help
}
and then in doSomethingRH(), I've got
private function doSomethingRH(event:ResultEvent):void
{
doSomethingElse();
}
private function doSomethingElse():void
{
var s:HTTPService = new HTTPService();
rq.action = "do_something_else";
s.url = "inc/php/test.php";
s.method = "POST";
s.request = rq;
s.requestTimeout = 120000;
s.addEventListener(ResultEvent.RESULT, doSomethingElseRH);
s.send();
s.disconnect(); // That's new, it wasn't there before
}
All of this works as expected using http://localhost (WAMP). But online, though I have backend indications that function do_something_else runs (so far), but function doSomethingElseRH() never gets called. Instead, I get the error I've seen from several posts :
[RPC Fault faultString="HTTP request error" faultCode="Server.Error.Request" faultDetail="Error: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2032: Stream Error. URL: http://test.net/inc/php/test.php"]. URL: http://test.net/inc/php/test.php"]
The problem pointed out most often is too many simultaneous connections. I don't need to do multiple connections, but thought perhaps I had them since I was starting the new POST in the previous POST return handler. Instead of calling doSomethingElse() directly, I added an event and did a dispatchEvent() to call it, but at least according to the call stack shown in FlashDevelop, the eventual call to doSomethingElse() was under the doSomethingRH() function (still learning this stuff). And all of that is conjecture based on a post I saw about getting the HTTPService instance from within event delivered to the return handler.
My ultimate question is, how can I achieve sequential POSTs like this without the error?
And if I'm getting the error because of the way I'm chaining them together, is there a clean-up function I can do so that when the return handler is called, the connection can be fully closed?
Update - it's fine
A pdf engine was being called within both functions, one to create a base file, the other to append some pages. It was working fine, but was updated recently. Blocking those activities allowed the http flow to work as expected, no disconnect() needed.
The best I can say for this is it's an example of chaining calls together that I haven't seen online, I suppose that's something.
It's possible that you s.disconnect(); too soon (hence PHP file is not found). Why disconnect immediately after .send before that even gets a chance to do anything? File access on hard drive is faster than between web server. If still failing then try adding a delay (ie: disconnect, then start a timer that counts to 3 seconds) before attempting to do doSomethingElse();...
Untested but try :
public var s:HTTPService; //make one and re-use
private function finishThis():void
{
s = new HTTPService();
rq.action = "do_something";
s.url = "inc/php/test.php";
s.method = "POST";
s.request = rq;
s.requestTimeout = 120000;
s.addEventListener(ResultEvent.RESULT, doSomethingRH);
s.send();
}
...then in doSomethingRH() :
private function doSomethingRH(event:ResultEvent):void
{
s.disconnect(); //is now finished so disconnect before re-use
doSomethingElse();
}
private function doSomethingElse():void
{
s = new HTTPService();
rq.action = "do_something_else";
s.url = "inc/php/test.php";
s.method = "POST";
s.request = rq;
s.requestTimeout = 120000;
s.addEventListener(ResultEvent.RESULT, doSomethingElseRH);
s.send();
}
h t t p should be http
relative urls are relative to where the swf is loaded from... i would have a baseUrl variable that you want to be the relative url
I'm trying to open multiple connections (various devices) to run a command and get the output.
The problem is that i have to run them "all at once"/parallel.
If i wait for one result and then to run the other one it takes way too long
and with a large number of devices that can go very bad.
I'm also using curl which I know that there is curl_multi and I was wondering if there was something similar with SSH for php.
I'm using Net_SSH2 for now.
You'll need to use two PHP libraries: https://robo.li/tasks/Remote/#ssh and https://github.com/cheprasov/php-parallel. Your class method might be something similar to the example below:
function runParallelSSH() {
$parallel = new Parallel(new ApcuStorage());
foreach ($credentials as $user => $host) {
$connection = sprintf('%s#%s', $user, $host);
$connections[] = $connection;
$Parallel->run($connection, function() {
$gitTask = $this->taskGitStack()
->checkout('master')
->pull();
});
}
$results = $parallel->wait($connections);
}
Without using thirdparties like curl_multi you have to use PHP multithreading, for this you need an extension pthreads.
Look in the docs for PHP threading
The most interesting feature is using it like this (code modified from PHP.net)
class My extends Thread {
public function run() {
//curl_exec whatever
}
}
$my = new My();
//start as many as you need
$my->start();
//wait for the threads to finnish and join one thread at a time with main-process-thread:
var_dump($my->join());:
Good Luck!
I am creating a cron job that will run every few minutes and it will read from database data to see which function needs to be called and act accordingly to the data but half the crons are written in codeigniter and the other half in native php.
Is there any way to do this? I have been googling but the anwser. I came up with is that it is impossible. I tried changing directory and than including or requiring index.php from the codeigniter, in which the function is that i need to call.
while doing this if my class is written in native php, It returns some errors that don't make sense and if I correct those errors, I would say that half the system function from codeigniter would be gone. It would still be a question if it will work even then.
If my class is written in codeigniter, when I include index.php, it just breaks. No errors no response or it says that the "ENVIRONMENT" variables are already defined. Thus I have been looking for a way to undefine those variables from config file or overwrite them to null or empty string but nothing works.
If you have any ideas it would be much appreciated.
I saw a question question link about some cron jobs in php where the user #michal kralik gave an answer about what i am doing in general with database and one cron class that will call other crons (coould use help for that too).
btw forgot to mention that using curl and exec will not work, because on our servers they sometimes just stop working for no reason.
UPDATE 1:
this is my class currently after so many tries:
class Unicron extends MY_Controller {
public $config;
function __construct() {
parent::__construct();
}
public function init(){
$config['base_url'] = "http://localhost/test";
define('EXT_CALL', true); // Added EXT_CALL constant to mark external calls
$_GET['controller/method'] = ''; // add pair to $_GET with call route as key
$current = getcwd(); // Save current directory path
chdir('C:/inetpub/wwwroot/test/'); // change directory to CI_INSTALLATION
include_once 'index.php'; // Add index.php (CI) to script
define('BASEPATH', 'C:/inetpub/wwwroot/test/system/');
$this->load->library("../../application/controllers/controller.php");
$job = new $this->controller->Class();
$isDone = $job->exportExcel(somekey);
echo $isDone;
$CI =& get_instance(); // Get instance of CI
$CI->exportExcel('baseparts', 'exportExcel');
// FOR STATIC CALLING!!
//$CI->method('controller','method');
//replace controller and method with call route
// eg: $CI->list('welcome','list'); If calling welcome/list route.
//$OUT->_display(); // to display output. (quick one)
// Or if you need output in variable,
//$output = $CI->load->view('VIEW_NAME',array(),TRUE);
//To call any specific view file (bit slow)
// You can pass variables in array. View file will pick those as it works in CI
chdir($current); // Change back to current directory
echo $current;
}
where i try to define BASEPATH it does not define it nor override the previous value.
In the index.php of other codeigniter i put:
if(!defined('ENVIRONMENT'))
define('ENVIRONMENT', 'development');
this way i resolved my issue with ENVIRONMENT already being set error.
this is a few things i found and combined together, hoping it could work but still when i call it via command line it shows nothing (even tried echo anything everywhere and nothing).
This may be a long comment rather than a answer as the code supplied requires a lot of work to make it useful.
Running multiple instances of 'codeigniter' - executed from codeigniter.
Using the 'execute programs via the shell' from PHP. Each instance runs in its own environment.
There are some excellent answers already available:
By default the PHP commands 'shell' wait for the command to complete...
732832/php-exec-vs-system-vs-passthru.
However, we want to 'fire and forget' quite often so this answer is quite useful...
1019867/is-there-a-way-to-use-shell-exec-without-waiting-for-the-command-to-complete
All i did was use this show an example of how to use 'codeigniter' to do this. The example was the 'Hello World' cli example from user manual. The version of ci is 2.1.14. I haven't used 'ci' before.
It is tested and works on 'PHP 5.3.18' on windows xp.
As well as the usual 'Hello World' example, i used an example of a a command that uses 'sleep' for a total of 20 seconds so that we can easily see that the 'ci' instances are separate from each other while executing.
Examples:
<?php
class Tools extends CI_Controller {
// the usual 'hello world' program
public function message($to = 'World')
{
echo "Hello {$to}!".PHP_EOL;
}
// so you can see that the processes are independant and 'standalone'
// run for 20 seconds and show progress every second.
public function waitMessage($to = 'World')
{
$countDown = 20;
while ($countDown >= 0) {
echo "Hello {$to}! - ending in {$countDown} seconds".PHP_EOL;
sleep(1);
$countDown--;
}
}
}
'ci' code to run 'ci' code...
<?php
class Runtools extends CI_Controller {
/*
* Executing background processes from PHP on Windows
* http://www.somacon.com/p395.php
*/
// spawn a process and do not wait for it to complete
public function runci_nowait($controller, $method, $param)
{
$runit = "php index.php {$controller} {$method} {$param}" ;
pclose(popen("start \"{$controller} {$method}\" {$runit}", "r"));
return;
}
// spawn a process and wait for the output.
public function runci_wait($controller, $method, $param)
{
$runit = "php index.php {$controller} {$method} {$param}";
$output = exec("{$runit}");
echo $output;
}
}
How to run them from the cli...
To run the 'ci' 'nowait' routine then do:
php index.php runtools runci_nowait <controller> <method> <param>
where the parameters are the ci controller you want to run. Chnge to 'runci_wait' for the other one.
'Hello World: 'wait for output' - (ci: tools message )
codeigniter>php index.php runtools runci_wait tools message ryan3
Hello ryan3!
The waitMessage - 'do not wait for output' - (ci : tools waitMessage )
codeigniter>php index.php runtools runci_nowait tools waitMessage ryan1
codeigniter>php index.php runtools runci_nowait tools waitMessage ryan2
These will start and run two separate 'ci' processes.
I want to execute a php-script from php that will use different constants and different versions of classes that are already defined.
Is there a sandbox php_module where i could just:
sandbox('script.php'); // run in a new php environment
instead of
include('script.php'); // run in the same environment
Or is proc_open() the only option?
PS: The script isn't accessible through the web, so fopen('http://host/script.php') is not an option.
There is runkit, but you may find it simpler to just call the script over the command line (Use shell_exec), if you don't need any interaction between the master and child processes.
The is a class on GitHub that may help, early stages but looks promising.
https://github.com/fregster/PHPSandbox
Also, you should look at the backtick operator:
$sOutput = `php script_to_run.php`;
This will allow you to inspect the output from the script you are running. However, note that the script will be run with the privileges you have, but you can circumvent this by using sudo on Linux.
This approach also assumes that you have the PHP CLI installed, which is not always the case.
There is Runkit_Sandbox - you might get it to work, it's a PHP extension. I'd say the way to go.
But you might need to create a "sandbox" your own, e.g. by resetting the global variable state of the superglobals you use.
class SandboxState
{
private $members = array('_GET', '_POST');
private $store = array();
public function save() {
foreach($members as $name) {
$this->store[$name] = $$name;
$$name = NULL;
}
}
public function restore() {
foreach($members as $name) {
$$name = $this->store[$name];
$this->store[$name] = NULL;
}
}
}
Usage:
$state = new SanddboxState();
$state->save();
// compile your get/post request by setting the superglobals
$_POST['submit'] = 'submit';
...
// execute your script:
$exec = function() {
include(func_get_arg(0)));
};
$exec('script.php');
// check the outcome.
...
// restore your own global state:
$state->restore();
dynamic plugin function execution that allows the loaded file and function to execute anything it wants, however it can only take and return variables that can be json_encode'ed.
function proxyExternalFunction($fileName, $functionName, $args, $setupStatements = '') {
$output = array();
$command = $setupStatements.";include('".addslashes($fileName)."');echo json_encode(".$functionName."(";
foreach ($args as $arg) {
$command .= "json_decode('".json_encode($arg)."',true),";
}
if (count($args) > 0) {
$command[strlen($command)-1] = ")";//end of $functionName
}
$command .= ");";//end of json_encode
$command = "php -r ".escapeshellarg($command);
exec($command, $output);
$output = json_decode($output,true);
}
the external code is totally sandboxed and you can apply any permission restrictions you want by doing sudo -u restricedUser php -r ....
I have developed a BSD-licensed sandbox class for this very purpose. It utilizes the PHPParser library to analyze the sandboxed code, check it against user-configurable whitelists and blacklists, and features a wide array of configuration options along with sane default settings. For your needs you can easily redefine classes called in your sandboxed code and route them to different ones.
The project also includes a sandbox toolkit (use only on your local machine!) that can be used to experiment with the sandbox settings, and a full manual and API documentation.
https://github.com/fieryprophet/php-sandbox
i know its not 100% topic related, but maybe useful for somebody n__n
function require_sandbox($__file,$__params=null,$__output=true) {
/* original from http://stackoverflow.com/a/3850454/209797 */
if($__params and is_array($__params))
extract($__params);
ob_start();
$__returned=require $__file;
$__contents=ob_get_contents();
ob_end_clean();
if($__output)
echo $__contents;
else
return $__returned;
};