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* Common: getVehicles

Fragt alle Fahrzeuge ab, speichert sie im SessionStorage ab und stellt eine Funktion zum Abrufen zur Verfügung

This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/484898/1311830/%2A%20Common%3A%20getVehicles.js 

// ==UserScript==
// @name        * Common: getVehicles
// @namespace   bos-ernie.leitstellenspiel.de
// @version     1.0.0
// @license     BSD-3-Clause
// @author      BOS-Ernie
// @description Fragt alle Fahrzeuge ab, speichert sie im SessionStorage ab und stellt eine Funktion zum Abrufen zur Verfügung
// @icon        https://www.google.com/s2/favicons?sz=64&domain=leitstellenspiel.de
// @run-at      document-idle
// @grant       none
// ==/UserScript==

async function getVehicles() {
  if (
    !sessionStorage.bosErnieVehicles ||
    JSON.parse(sessionStorage.bosErnieVehicles).lastUpdate < new Date().getTime() - 5 * 1000 * 60
  ) {
    return updateVehiclesCache();
  }

  return JSON.parse(LZString.decompress(JSON.parse(sessionStorage.bosErnieVehicles).value));
}

async function updateVehiclesCache() {
  let vehicles = [];
  let nextPage = null;
  let page = 0;
  let totalPages = null;

  do {
    page++;

    if (page === 1) {
      nextPage = "/api/v2/vehicles";
    }

    const response = await fetch(nextPage).then(response => response.json());

    vehicles = vehicles.concat(
      response.result.map(vehicle => ({
        id: vehicle.id,
        caption: vehicle.caption,
        building_id: vehicle.building_id,
        vehicle_type: vehicle.vehicle_type,
        assigned_personnel_count: vehicle.assigned_personnel_count,
        tractive_vehicle_id: vehicle.tractive_vehicle_id,
      })),
    );

    nextPage = response.paging.next_page;

    if (totalPages === null) {
      totalPages = Math.ceil(response.paging.count_total / 10000);
    }
  } while (nextPage);

  const lastUpdate = new Date();

  try {
    const compressedVehicleData = LZString.compress(JSON.stringify(vehicles));

    const uncompressedSize = JSON.stringify(vehicles).length;
    const compressedSize = compressedVehicleData.length;

    sessionStorage.setItem(
      "bosErnieVehicles",
      JSON.stringify({
        lastUpdate: lastUpdate.getTime(),
        value: compressedVehicleData,
        uncompressedSize: uncompressedSize,
        compressedSize: compressedSize,
      }),
    );
  } catch (e) {}

  return vehicles;
}