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* Common: IndexedDB

Stellt Funktionen zum Speichern und Abrufen von Daten in der IndexedDB bereit

Ce script ne devrait pas être installé directement. C'est une librairie créée pour d'autres scripts. Elle doit être inclus avec la commande // @require https://update.greasyfork.org/scripts/491642/1354166/%2A%20Common%3A%20IndexedDB.js 

// ==UserScript==
// @name        * Common: IndexedDB
// @namespace   bos-ernie.leitstellenspiel.de
// @version     1.1.0
// @license     BSD-3-Clause
// @author      BOS-Ernie
// @description Stellt Funktionen zum Speichern und Abrufen von Daten in der IndexedDB bereit
// @icon        https://www.google.com/s2/favicons?sz=64&domain=leitstellenspiel.de
// @run-at      document-idle
// @grant       none
// ==/UserScript==

const databaseName = "BosErnie";
const objectStoreName = "GebäudeUndFahrzeugVerwalter";

const keyBuildings = "Buildings";
const keyVehicles = "Vehicles";
const keySettings = "Settings";

function openDB() {
  return new Promise((resolve, reject) => {
    const request = window.indexedDB.open(databaseName, 1);

    request.onerror = () => {
      reject("Failed to open the database");
    };

    request.onsuccess = event => {
      const db = event.target.result;
      resolve(db);
    };

    request.onupgradeneeded = event => {
      const db = event.target.result;
      const objectStore = db.createObjectStore(objectStoreName);
      objectStore.createIndex("IndexName", "propertyName", { unique: false });
    };
  });
}

async function storeData(data, key) {
  const db = await openDB();

  return new Promise((resolve, reject) => {
    const transaction = db.transaction([objectStoreName], "readwrite");
    const objectStore = transaction.objectStore(objectStoreName);

    const request = objectStore.put(data, key);

    request.onsuccess = () => {
      resolve("Data stored successfully");
    };

    request.onerror = () => {
      reject("Failed to store data");
    };
  });
}

async function retrieveData(key) {
  const db = await openDB();

  return new Promise((resolve, reject) => {
    const transaction = db.transaction([objectStoreName], "readonly");
    const objectStore = transaction.objectStore(objectStoreName);

    const request = objectStore.get(key);

    request.onsuccess = event => {
      const data = event.target.result;
      resolve(data);
    };

    request.onerror = () => {
      reject("Failed to retrieve data");
    };
  });
}