Very rough WIP of an IndexedDBStore

src/matrix.js

@@ -21,6 +21,8 @@ module.exports.MatrixEvent = require("./models/event").MatrixEvent;
 module.exports.EventStatus = require("./models/event").EventStatus;
 /** The {@link module:store/memory.MatrixInMemoryStore|MatrixInMemoryStore} class. */
 module.exports.MatrixInMemoryStore = require("./store/memory").MatrixInMemoryStore;
+/** The {@link module:store/indexeddb.IndexedDBStore|IndexedDBStore} class. */
+module.exports.IndexedDBStore = require("./store/indexeddb").IndexedDBStore;
 /** The {@link module:http-api.MatrixHttpApi|MatrixHttpApi} class. */
 module.exports.MatrixHttpApi = require("./http-api").MatrixHttpApi;
 /** The {@link module:http-api.MatrixError|MatrixError} class. */

src/store/indexeddb.js

@@ -0,0 +1,74 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+
+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.
+*/
+"use strict";
+
+/**
+ * This is an internal module. See {@link IndexedDBStore} for the public class.
+ * @module store/indexeddb
+ */
+
+const VERSION = 1;
+
+/**
+ * Construct a new Indexed Database store. This requires a call to <code>connect()</code> before
+ * this store can be used.
+ * @constructor
+ * @param {Object} indexedDBInterface The Indexed DB interface e.g <code>window.indexedDB</code>
+ */
+module.exports.IndexedDBStore = function IndexedDBStore(indexedDBInterface) {
+    this.indexedDB = indexedDBInterface;
+    this.db = null;
+};
+
+
+module.exports.IndexedDBStore.prototype = {
+    /**
+     * Attempt to connect to the database. This can fail if the user does not grant permission.
+     * @return {Promise} Resolves if successfully connected.
+     */
+    connect: function() {
+        if (this.db) {
+            return Promise.resolve();
+        }
+        const req = this.indexedDB.open("matrix-js-sdk", VERSION);
+        req.onupgradeneeded = (ev) => {
+            const db = req.result;
+            const oldVersion = ev.oldVersion;
+            if (oldVersion < 1) { // The database did not previously exist.
+                createDatabase(db);
+            }
+            // Expand as needed.
+        }
+        return promiseify(req).then((ev) => {
+            this.db = ev.target.result;
+        });
+    }
+}
+
+function createDatabase(db) {
+    // TODO: Make object stores and indexes.
+}
+
+function promiseify(req) {
+    return new Promise((resolve, reject) => {
+        req.onsuccess = function(event) {
+            resolve(event);
+        };
+        req.onerror = function(event) {
+            reject(event);
+        };
+    });
+}

src/store/memory.js

@@ -274,10 +274,4 @@ module.exports.MatrixInMemoryStore.prototype = {
     getAccountData: function(eventType) {
         return this.accountData[eventType];
     },
-
-    // TODO
-    //setMaxHistoryPerRoom: function(maxHistory) {},
-
-    // TODO
-    //reapOldMessages: function() {},
 };

src/store/stub.js

@@ -179,12 +179,6 @@ StubStore.prototype = {
     getAccountData: function(eventType) {
 
     },
-
-    // TODO
-    //setMaxHistoryPerRoom: function(maxHistory) {},
-
-    // TODO
-    //reapOldMessages: function() {},
 };
 
 /** Stub Store class. */