gistfile1.js

(function showIndexedDbSize() {
  "use strict";
  function openDatabases(...dbnames) {
    console.log('dbnames', dbnames);
    return Promise.all(dbnames.map(dbname =>
      (new Promise(function(resolve, reject) {
        var request = window.indexedDB.open(dbname);
        request.onsuccess = function(event) {
          const db = event.target.result;
          resolve(db);
        };
      })).then(async db => {
        var PromiseArray = [];
        console.log('total:', db.objectStoreNames.length);
        for (var i = 0; i < db.objectStoreNames.length; i++) {
          PromiseArray.push(await getObjectStoreData(db, db.objectStoreNames[i], i));
        }
        console.log('done', JSON.stringify(PromiseArray));

        return PromiseArray;
      })
    )).then((amount) => {
      return [].concat(...amount);
    });
  }

  function getObjectStoreData(db, storename) {
    return new Promise(function(resolve, reject) {
      var trans = db.transaction(storename, IDBTransaction.READ_ONLY);
      var store = trans.objectStore(storename);
      var items = [];
      trans.oncomplete = function(evt) {
        var szBytes = toSize(items);
        var szMBytes = (szBytes / 1024 / 1024).toFixed(2);

        resolve({
          "Store Name": storename,
          Items: items.length,
          Size: szMBytes + "MB (" + szBytes + " bytes)"
        });
      };
      var cursorRequest = store.openCursor();
      cursorRequest.onerror = function(error) {
        reject(error);
      };
      cursorRequest.onsuccess = function(evt) {
        var cursor = evt.target.result;
        if (cursor) {
          items.push(cursor.value);
          cursor.continue();
        }
      };
    });
  }

  function toSize(items) {
    var size = 0;
    for (var i = 0; i < items.length; i++) {
      var objectSize = JSON.stringify(items[i]).length;
      size += objectSize * 2;
    }
    return size;
  }

  function process(storesizes) {
    console.log('process-checkpoint-1');
    console.table(storesizes);
  }

  openDatabases(
    "./data",
    "data/blocks",
    "data/datastore",
    "data/keys",
    "0x-mesh-db",
    "augur-42"
  ).then(process);
})();