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Artem Baranovskyi authored81a9e9f3
<?php
// This file is part of Moodle - https://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <https://www.gnu.org/licenses/>.
/**
* This is an api endpoint that sends a request to a local container with a flask-based server.
* The plugin uses the ASYST grading tool <https://transfer.hft-stuttgart.de/gitlab/ulrike.pado/ASYST>
* modified to work as a web endpoint.
*
* @package local_asystgrade
* @copyright 2024 Artem Baranovskyi <artem.baranovsky1980@gmail.com>
* @copyright based on work by 2023 Ulrike Pado <ulrike.pado@hft-stuttgart.de>,
* @copyright Yunus Eryilmaz & Larissa Kirschner <https://link.springer.com/article/10.1007/s40593-023-00383-w>
* @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require_once($_SERVER['DOCUMENT_ROOT'] . '/config.php');
require_once('lib.php');
use local_asystgrade\api\client;
use local_asystgrade\api\http_client;
try {
require_login();
} catch (coding_exception | moodle_exception $e) {
debugging($e->getMessage());
redirect(
new moodle_url('/local/asystgrade/error.php'),
get_string('loginerror', 'local_asystgrade')
);
}
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$data = json_decode(file_get_contents('php://input'), true);
if ($data) {
// Preparing Flask API.
try {
$apiendpoint = get_config('local_asystgrade', 'apiendpoint');
if (!$apiendpoint) {
throw new dml_exception('missingconfig', 'local_asystgrade');
}
} catch (dml_exception $e) {
debugging('Config error: ' . $e->getMessage());
$apiendpoint = 'http://127.0.0.1:5001/api/autograde'; // Default value.
}
$httpclient = new http_client();
$apiclient = client::getInstance($apiendpoint, $httpclient);
$maxretries = 3;
$attempts = 0;
$success = false;
while ($attempts < $maxretries && !$success) {
try {
// Sending data to Flask and obtaining an answer.
$response = $apiclient->send_data($data);
$success = true;
} catch (Exception $e) {
$attempts++;
debugging('API request error: ' . $e->getMessage());
if ($attempts >= $maxretries) {
echo json_encode(['error' => 'A server error occurred. Please try again later.']);
exit; // Ensure to stop further processing.
}
}
}
if ($success) {
$grades = json_decode($response, true);
// Check JSON validity.
if (json_last_error() === JSON_ERROR_NONE) {
echo json_encode(['success' => true, 'grades' => $grades]);
} else {
debugging('JSON decode error: ' . json_last_error_msg());
echo json_encode(['error' => 'Invalid JSON from Flask API']);
}
}
} else {
echo json_encode(['error' => 'No data received']);
}
} else {
echo json_encode(['error' => 'Invalid request method']);
}