First cut

src/store/indexeddb.js

@@ -1,5 +1,5 @@
 /*
-Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2017 OpenMarket Ltd
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@ limitations under the License.
 */
 "use strict";
 
+import q from "q";
+
 /**
  * This is an internal module. See {@link IndexedDBStore} for the public class.
  * @module store/indexeddb
@@ -41,7 +43,7 @@ module.exports.IndexedDBStore.prototype = {
      */
     connect: function() {
         if (this.db) {
-            return Promise.resolve();
+            return q();
         }
         const req = this.indexedDB.open("matrix-js-sdk", VERSION);
         req.onupgradeneeded = (ev) => {
@@ -51,19 +53,117 @@ module.exports.IndexedDBStore.prototype = {
                 createDatabase(db);
             }
             // Expand as needed.
-        }
-        return promiseify(req).then((ev) => {
+        };
+        return promiseifyRequest(req).then((ev) => {
             this.db = ev.target.result;
         });
-    }
-}
+    },
+
+    /**
+     * Clear the entire database. This should be used when logging out of a client
+     * to prevent mixing data between accounts.
+     * @return {Promise} Resolved when the database is cleared.
+     */
+    clearDatabase: function() {
+        return promiseifyRequest(this.indexedDB.deleteDatabase("matrix-js-sdk"));
+    },
+
+    /**
+     * Persist a list of Room objects.
+     * @param {Room[]} rooms An array of rooms
+     * @return {Promise} Resolves if the rooms were persisted.
+     */
+    persistRooms: function(rooms) {
+        return q.try(() => {
+            const txn = this.db.transaction(["rooms"], "readwrite");
+            const store = txn.objectStore("rooms");
+            for (let i =0; i < rooms.length; i++) {
+                store.put(rooms[i]); // put == UPSERT
+            }
+            return promiseifyTxn(txn);
+        });
+    },
+
+    /**
+     * Persist a sync token.
+     * @param {string} syncToken The token to persist.
+     * @return {Promise} Resolves if the token was persisted.
+     */
+    persistSyncToken: function(syncToken) {
+        const obj = {
+            clobber: "-", // constant key so will always clobber
+            syncToken: syncToken,
+        };
+        return q.try(() => {
+            const txn = this.db.transaction(["config"], "readwrite");
+            const store = txn.objectStore("config");
+            store.put(obj); // put == UPSERT
+            return promiseifyTxn(txn);
+        });
+    },
+
+    /**
+     * Persist a list of account data events.
+     * @param {MatrixEvent[]} accountData An array of user-scoped account data events
+     * @return {Promise} Resolves if the events were persisted.
+     */
+    persistAccountData: function(accountData) {
+        return q.try(() => {
+            const txn = this.db.transaction(["accountData"], "readwrite");
+            const store = txn.objectStore("accountData");
+            for (let i =0; i < accountData.length; i++) {
+                store.put(accountData[i]); // put == UPSERT
+            }
+            return promiseifyTxn(txn);
+        });
+    },
+
+    /**
+     * Persist a list of User objects.
+     * @param {User[]} users An array of users
+     * @return {Promise} Resolves if the users were persisted.
+     */
+    persistUsers: function(users) {
+        return q.try(() => {
+            const txn = this.db.transaction(["users"], "readwrite");
+            const store = txn.objectStore("users");
+            for (let i =0; i < users.length; i++) {
+                store.put(users[i]); // put == UPSERT
+            }
+            return promiseifyTxn(txn);
+        });
+    },
+
+};
 
 function createDatabase(db) {
-    // TODO: Make object stores and indexes.
+    // Make room store, clobber based on room ID. (roomId property of Room objects)
+    db.createObjectStore("rooms", { keyPath: ["roomId"] });
+
+    // Make user store, clobber based on user ID. (userId property of User objects)
+    db.createObjectStore("users", { keyPath: ["userId"] });
+
+    // Make account data store, clobber based on event type.
+    // (event.type property of MatrixEvent objects)
+    db.createObjectStore("accountData", { keyPath: ["event.type"] });
+
+    // Make configuration store (sync tokens, etc), always clobber (const key).
+    db.createObjectStore("config", { keyPath: ["clobber"] });
 }
 
-function promiseify(req) {
-    return new Promise((resolve, reject) => {
+function promiseifyTxn(txn) {
+    return new q.Promise((resolve, reject) => {
+        txn.oncomplete = function(event) {
+            resolve(event);
+        };
+        txn.onerror = function(event) {
+            reject(event);
+        };
+    });
+}
+
+function promiseifyRequest(req) {
+    return new q.Promise((resolve, reject) => {
         req.onsuccess = function(event) {
             resolve(event);
         };
@@ -71,4 +171,4 @@ function promiseify(req) {
             reject(event);
         };
     });
-}
+}