How to disable output buffering for Laravel - php

Question

I have this function in controller ImportController.php, I seding a file to import using the Laravel Excel library...
Laravel version: 5.5
Php Version: PHP 7.2.19-0ubuntu0.18.10.1 (cli) (built: Jun 4 2019 14:46:43) ( NTS )
One sheet the client is sending is taking a lot of time. Then I make a progress bar for the client get a feedback when is importing/saving data from the sheet.
This is the javascript function here is sending the sheet and token and if is a ajax request.
.....
let fd = new FormData();
fd.append(_archiveInputId, archivoSeleccionado.files[0]);
fd.append("_token", window.Laravel.csrfToken);
fd.append("isHttpRequest", true);
let xmlHTTP = new XMLHttpRequest();
xmlHTTP.upload.addEventListener("progress", progressFunction, false);
xmlHTTP.addEventListener("load", transferCompleteFunction, false);
xmlHTTP.addEventListener("error", uploadFailed, false);
xmlHTTP.addEventListener("abort", uploadCanceled, false);
xmlHTTP.responseType = 'json';
xmlHTTP.response = 'json';
xmlHTTP.open("POST", _url, true);
xmlHTTP.send(fd);
.....
/**
* Progress Function
* #param evt
*/
function progressFunction(evt) {
console.log(evt);
}
This is my controller:
public function import(ImportFormRequest $request)
{
$isHttpRequest = $request->has('isHttpRequest') ? $request->has('isHttpRequest') : false;
if($isHttpRequest){
echo "creating EventsImport class";
flush();
sleep(1);
}
$import = new EventsImport(EventsImport::TYPE_SIMPLE, $request->file('sheet'));
try{
if($isHttpRequest){
echo "importing data from sheet";
flush();
sleep(1);
}
Excel::import($import, $request->file('sheet'));
}catch (\Exception $e){
return $this->returnJsonResponseHttpRequest("nok","Erro ao realizar importação! Erro: ".$e->getMessage());
}
}
These outputs echo "importing data from sheet" is for testing.
I tried with:
ob_flush();
flush();
php.ini -> output_buffering=Off
.htaccess -> mod_env.c -> SetEnv no-gzip 1
But none worked (in laravel). In tests outside Laravel ob_flush and flush works fine.
Anyone have any idea?

Answer 1

After a long time and a travel along mountains and 5 cigarettes.
In PHP controller function add:
$response = new StreamedResponse(function() use ($request) {
for($i = 0; $i <= 3; $i++){
echo "Data: ".json_encode(['teste' => "teste"])."\n\n";
flush();
}
});
$response->headers->set('Content-Type', 'text/event-stream');
$response->headers->set('X-Accel-Buffering', 'no');
$response->headers->set('Cach-Control', 'no-cache');
$response->send();
sleep(5);
In javascript function to start the XMLHttpRequest:
// Remove the responseType and response as json.
let fd = new FormData();
fd.append(_archiveInputId, archivoSeleccionado.files[0]);
fd.append("_token", window.Laravel.csrfToken);
fd.append("isHttpRequest", true);
let xmlHTTP = new XMLHttpRequest();
xmlHTTP.seenBytes = 0;
xmlHTTP.onreadystatechange = function(evt) {
console.log("%c Content: ", 'color: red;', evt.srcElement.response);
};
xmlHTTP.upload.addEventListener("progress", progressFunction, false);
xmlHTTP.addEventListener("load", transferCompleteFunction, false);
xmlHTTP.addEventListener("error", uploadFailed, false);
xmlHTTP.addEventListener("abort", uploadCanceled, false);
xmlHTTP.open("POST", _url, true);
xmlHTTP.send(fd);