Proyectos de Subversion Moodle

// This file is part of Moodle - http://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 <http://www.gnu.org/licenses/>.

/**

 * JS room updater.

 *

 * @module      mod_bigbluebuttonbn/roomupdater

 * @copyright   2021 Blindside Networks Inc

 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

import Pending from 'core/pending';

import Templates from "core/templates";

import {exception as displayException} from 'core/notification';

import {getMeetingInfo} from './repository';

let timerReference = null;

let timerRunning = false;

let pollInterval = 0;

let pollIntervalFactor = 1;

const MAX_POLL_INTERVAL_FACTOR = 10;

const resetValues = () => {

    timerRunning = false;

    timerReference = null;

    pollInterval = 0;

    pollIntervalFactor = 1;

};

/**

 * Start the information poller.

 * @param {Number} interval interval in miliseconds between each poll action.

 */

export const start = (interval) => {

    resetValues();

    timerRunning = true;

    pollInterval = interval;

    poll();

};

/**

 * Stop the room updater.

 */

export const stop = () => {

    if (timerReference) {

        clearTimeout(timerReference);

    }

    resetValues();

};

/**

 * Start the information poller.

 */

const poll = () => {

    if (!timerRunning || !pollInterval) {

        // The poller has been stopped.

        return;

    }

    updateRoom()

        .then((updateOk) => {

            if (!updateOk) {

                pollIntervalFactor = (pollIntervalFactor < MAX_POLL_INTERVAL_FACTOR) ?

                    pollIntervalFactor + 1 : MAX_POLL_INTERVAL_FACTOR;

                // We make sure if there is an error that we do not try too often.

            }

            timerReference = setTimeout(() => poll(), pollInterval * pollIntervalFactor);

            return true;

        })

        .catch();

};

/**

 * Update the room information.

 *

 * @param {boolean} [updatecache=false] should we update cache

 * @returns {Promise}

 */

export const updateRoom = (updatecache = false) => {

    const bbbRoomViewElement = document.getElementById('bigbluebuttonbn-room-view');

    if (bbbRoomViewElement === null) {

        return Promise.resolve(false);

    }

    const bbbId = bbbRoomViewElement.dataset.bbbId;

    const groupId = bbbRoomViewElement.dataset.groupId;

    const pendingPromise = new Pending('mod_bigbluebuttonbn/roomupdater:updateRoom');

    return getMeetingInfo(bbbId, groupId, updatecache)

        .then(data => {

            // Just make sure we have the right information for the template.

            data.haspresentations = !!(data.presentations && data.presentations.length);

            return Templates.renderForPromise('mod_bigbluebuttonbn/room_view', data);

        })

        .then(({html, js}) => Templates.replaceNode(bbbRoomViewElement, html, js))

        .then(() => pendingPromise.resolve())

        .catch(displayException);

};