# All files / helpers idb-manager.ts

100% Statements 59/59
100% Branches 17/17
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     /**
     * @license
     * Copyright 2019 Google LLC
     *
     * 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 { DB, openDb } from 'idb';
    import { AppConfig } from '../interfaces/app-config';
    import { InstallationEntry } from '../interfaces/installation-entry';
    import { getKey } from '../util/get-key';
    import { fidChanged } from './fid-changed';

    const DATABASE_NAME = 'firebase-installations-database';
    const DATABASE_VERSION = 1;
    const OBJECT_STORE_NAME = 'firebase-installations-store';

    let dbPromise: Promise<DB> | null = null;
    function getDbPromise(): Promise<DB> {
      if (!dbPromise) {
        dbPromise = openDb(DATABASE_NAME, DATABASE_VERSION, upgradeDB => {
          // We don't use 'break' in this switch statement, the fall-through
          // behavior is what we want, because if there are multiple versions between
          // the old version and the current version, we want ALL the migrations
          // that correspond to those versions to run, not only the last one.
          // eslint-disable-next-line default-case
          switch (upgradeDB.oldVersion) {
            case 0:
              upgradeDB.createObjectStore(OBJECT_STORE_NAME);
          }
        });
      }
      return dbPromise;
    }

    /** Gets record(s) from the objectStore that match the given key. */
    export async function get(
      appConfig: AppConfig
    ): Promise<InstallationEntry | undefined> {
      const key = getKey(appConfig);
      const db = await getDbPromise();
      return db
        .transaction(OBJECT_STORE_NAME)
        .objectStore(OBJECT_STORE_NAME)
        .get(key);
    }

    /** Assigns or overwrites the record for the given key with the given value. */
    export async function set<ValueType extends InstallationEntry>(
      appConfig: AppConfig,
      value: ValueType
    ): Promise<ValueType> {
      const key = getKey(appConfig);
      const db = await getDbPromise();
      const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');
      const objectStore = tx.objectStore(OBJECT_STORE_NAME);
      const oldValue = await objectStore.get(key);
      await objectStore.put(value, key);
      await tx.complete;

      if (!oldValue || oldValue.fid !== value.fid) {
        fidChanged(appConfig, value.fid);
      }

      return value;
    }

    /** Removes record(s) from the objectStore that match the given key. */
    export async function remove(appConfig: AppConfig): Promise<void> {
      const key = getKey(appConfig);
      const db = await getDbPromise();
      const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');
      await tx.objectStore(OBJECT_STORE_NAME).delete(key);
      await tx.complete;
    }

    /**
     * Atomically updates a record with the result of updateFn, which gets
     * called with the current value. If newValue is undefined, the record is
     * deleted instead.
     * @return Updated value
     */
    export async function update<ValueType extends InstallationEntry | undefined>(
      appConfig: AppConfig,
      updateFn: (previousValue: InstallationEntry | undefined) => ValueType
    ): Promise<ValueType> {
      const key = getKey(appConfig);
      const db = await getDbPromise();
      const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');
      const store = tx.objectStore(OBJECT_STORE_NAME);
      const oldValue: InstallationEntry | undefined = await store.get(key);
      const newValue = updateFn(oldValue);

      if (newValue === undefined) {
        await store.delete(key);
      } else {
        await store.put(newValue, key);
      }
      await tx.complete;

      if (newValue && (!oldValue || oldValue.fid !== newValue.fid)) {
        fidChanged(appConfig, newValue.fid);
      }

      return newValue;
    }

    export async function clear(): Promise<void> {
      const db = await getDbPromise();
      const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');
      await tx.objectStore(OBJECT_STORE_NAME).clear();
      await tx.complete;
    }