feat(storage-adapter-indexeddb): implement get, put, del

implement initial get, put, del functions

#146

packages/storage-adapter-indexeddb/README.md

@@ -1 +1,63 @@
+# index
 
+IndexedDB adapter for spark-core storage layer
+
+# constructor
+
+**Parameters**
+
+-   `basekey` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** localforage key under which
+    all namespaces will be stored
+
+# bind
+
+Returns an adapter bound to the specified namespace
+
+**Parameters**
+
+-   `namespace` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** 
+-   `options` **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** 
+
+Returns **[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)<[Bound](#bound)>** 
+
+# Bound
+
+localforage binding
+
+## constructor
+
+**Parameters**
+
+-   `namespace` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** 
+-   `options` **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** 
+
+## del
+
+Removes the specified key
+
+**Parameters**
+
+-   `key` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** 
+
+Returns **[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)** 
+
+## get
+
+Retrieves the data at the specified key
+
+**Parameters**
+
+-   `key` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** 
+
+Returns **[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)<mixed>** 
+
+## put
+
+Stores the specified value at the specified key
+
+**Parameters**
+
+-   `key` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** 
+-   `value` **mixed** 
+
+Returns **[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)** 

packages/storage-adapter-indexeddb/package.json

@@ -11,6 +11,7 @@
     "@ciscospark/common": "^0.7.0-alpha",
     "@ciscospark/spark-core": "^0.7.0-alpha",
     "babel-runtime": "^6.3.19",
+    "localforage": "^1.4.2",
     "lodash": "^4.5.1"
   },
   "devDependencies": {

packages/storage-adapter-indexeddb/src/index.js

@@ -3,3 +3,132 @@
  * Copyright (c) 2015-2016 Cisco Systems, Inc. See LICENSE file.
  * @private
  */
+
+ /* eslint-env browser */
+
+import localforage from 'localforage';
+
+import {NotFoundError} from '@ciscospark/spark-core';
+
+const namespaces = new WeakMap();
+const loggers = new WeakMap();
+
+/**
+* IndexedDB adapter for spark-core storage layer
+*/
+export default class StorageAdapterIndexedDB {
+  /**
+   * @constructs {StorageAdapterIndexedDB}
+   * @param {string} basekey localforage key under which
+   * all namespaces will be stored
+   */
+  constructor(basekey) {
+    /**
+     * localforage binding
+     */
+    this.Bound = class {
+      /**
+       * @constructs {Bound}
+       * @param {string} namespace
+       * @param {Object} options
+       */
+      constructor(namespace, options) {
+        namespaces.set(this, namespace);
+        loggers.set(this, options.logger);
+      }
+
+      /**
+       * @private
+       * @returns {mixed}
+       */
+      _load() {
+        const rawData = localforage.getItem(basekey);
+        const allData = rawData ? JSON.parse(rawData) : {};
+        return allData[namespaces.get(this)] || {};
+      }
+
+      /**
+       * @param {Object} data
+       * @private
+       * @returns {undefined}
+       */
+      _save(data) {
+        const rawData = localforage.getItem(basekey);
+        const allData = rawData ? JSON.parse(rawData) : {};
+        allData[namespaces.get(this)] = data;
+
+        localforage.setItem(basekey, JSON.stringify(allData));
+      }
+
+      /**
+       * Removes the specified key
+       * @param {string} key
+       * @returns {Promise}
+       */
+      del(key) {
+        return new Promise((resolve) => {
+          loggers.get(this).info(`indexeddb-store-adapter: deleting \`${key}\``);
+          const data = this._load();
+          Reflect.deleteProperty(data, key);
+          this._save(data);
+          resolve();
+        });
+      }
+
+      /**
+       * Retrieves the data at the specified key
+       * @param {string} key
+       * @returns {Promise<mixed>}
+       */
+      get(key) {
+        return new Promise((resolve, reject) => {
+          loggers.get(this).info(`indexeddb-store-adapter: reading \`${key}\``);
+          const data = this._load();
+          const value = data[key];
+          if (value) {
+            return resolve(value);
+          }
+
+          return reject(new NotFoundError(`No value found for ${key}`));
+        });
+      }
+
+      /**
+       * Stores the specified value at the specified key
+       * @param {string} key
+       * @param {mixed} value
+       * @returns {Promise}
+       */
+      put(key, value) {
+        return new Promise((resolve) => {
+          loggers.get(this).info(`indexeddb-store-adapter: writing \`${key}\``);
+          const data = this._load();
+          data[key] = value;
+          this._save(data);
+          resolve();
+        });
+      }
+    };
+  }
+
+  /**
+  * Returns an adapter bound to the specified namespace
+  * @param {string} namespace
+  * @param {Object} options
+  * @returns {Promise<Bound>}
+  */
+  bind(namespace, options) {
+    options = options || {};
+    if (!namespace) {
+      return Promise.reject(new Error(`\`namespace\` is required`));
+    }
+
+    if (!options.logger) {
+      return Promise.reject(new Error(`\`options.logger\` is required`));
+    }
+
+    options.logger.info(`local-storage-indexeddb: returning binding`);
+
+    return Promise.resolve(new this.Bound(namespace, options));
+  }
+}