text: /*
  Copyright 2020 Bruno Windels <bruno@windels.cloud>
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  */
  
  import {Transaction} from "./Transaction.js";
  import { STORE_NAMES, StorageError } from "../common.js";
  import { reqAsPromise } from "./utils.js";
  
  const WEBKITEARLYCLOSETXNBUG_BOGUS_KEY = "782rh281re38-boguskey";
  
  export class Storage {
      constructor(idbDatabase, hasWebkitEarlyCloseTxnBug) {
          this._db = idbDatabase;
          this._hasWebkitEarlyCloseTxnBug = hasWebkitEarlyCloseTxnBug;
          const nameMap = STORE_NAMES.reduce((nameMap, name) => {
              nameMap[name] = name;
              return nameMap;
          }, {});
          this.storeNames = Object.freeze(nameMap);
      }
  
      _validateStoreNames(storeNames) {
          const idx = storeNames.findIndex(name => !STORE_NAMES.includes(name));
          if (idx !== -1) {
              throw new StorageError(`Tried top, a transaction unknown store ${storeNames[idx]}`);
          }
      }
  
      async readTxn(storeNames) {
          this._validateStoreNames(storeNames);
          try {
              const txn = this._db.transaction(storeNames, "readonly");
              // https://bugs.webkit.org/show_bug.cgi?id=222746 workaround,
              // await a bogus idb request on the new txn so it doesn't close early if we await a microtask first
              if (this._hasWebkitEarlyCloseTxnBug) {
                  await reqAsPromise(txn.objectStore(storeNames[0]).get(WEBKITEARLYCLOSETXNBUG_BOGUS_KEY));
              }
              return new Transaction(txn, storeNames);
          } catch(err) {
              throw new StorageError("readTxn failed", err);
          }
      }
  
      async readWriteTxn(storeNames) {
          this._validateStoreNames(storeNames);
          try {
              const txn = this._db.transaction(storeNames, "readwrite");
              // https://bugs.webkit.org/show_bug.cgi?id=222746 workaround,
              // await a bogus idb request on the new txn so it doesn't close early if we await a microtask first
              if (this._hasWebkitEarlyCloseTxnBug) {
                  await reqAsPromise(txn.objectStore(storeNames[0]).get(WEBKITEARLYCLOSETXNBUG_BOGUS_KEY));
              }
              return new Transaction(txn, storeNames);
          } catch(err) {
              throw new StorageError("readWriteTxn failed", err);
          }
      }
  
      close() {
          this._db.close();
      }
  }
  