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gaia/apps/homescreen/js/appsmetadata.js

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+'use strict';
+
+(function(exports) {
+  const DB_NAME = 'home-metadata';
+  const DB_ORDER_STORE = 'order';
+  const DB_ICON_STORE = 'icon';
+  const DB_VERSION = 1;
+
+  function AppsMetadata() {}
+
+  AppsMetadata.prototype = {
+    db: null,
+
+    init: function() {
+      return new Promise((resolve, reject) => {
+        var req = window.indexedDB.open(DB_NAME, DB_VERSION);
+        req.onupgradeneeded = this.upgradeSchema;
+        req.onsuccess = (e) => {
+          this.db = e.target.result;
+          resolve();
+        };
+        req.onerror = (e) => {
+          console.error('Error opening homescreen metadata db', e);
+          reject(e);
+        };
+      });
+    },
+
+    upgradeSchema: function(e) {
+      var db = e.target.result;
+      var fromVersion = e.oldVersion;
+      if (fromVersion < 1) {
+        var store = db.createObjectStore(DB_ORDER_STORE, { keyPath: 'id' });
+        store.createIndex('order', 'order', { unique: false });
+        store = db.createObjectStore(DB_ICON_STORE, { keyPath: 'id' });
+        store.createIndex('icon', 'icon', { unique: false });
+      }
+    },
+
+    set: function(data) {
+      return new Promise((resolve, reject) => {
+        var txn = this.db.transaction([DB_ORDER_STORE, DB_ICON_STORE],
+                                      'readwrite');
+        for (var entry of data) {
+          if (!entry.id) {
+            continue;
+          }
+
+          if (typeof entry.order !== 'undefined') {
+            txn.objectStore(DB_ORDER_STORE).
+              put({ id: entry.id, order: entry.order });
+          }
+          if (typeof entry.icon !== 'undefined') {
+            txn.objectStore(DB_ICON_STORE).
+              put({ id: entry.id, icon: entry.icon });
+          }
+        }
+        txn.oncomplete = resolve;
+        txn.onerror = reject;
+      });
+    },
+
+    remove: function(id) {
+      return new Promise((resolve, reject) => {
+        var txn = this.db.transaction([DB_ORDER_STORE, DB_ICON_STORE],
+                                      'readwrite');
+        txn.objectStore(DB_ORDER_STORE).delete(id);
+        txn.objectStore(DB_ICON_STORE).delete(id);
+        txn.oncomplete = resolve;
+        txn.onerror = reject;
+      });
+    },
+
+    getAll: function(onResult) {
+      return new Promise((resolve, reject) => {
+        var txn = this.db.transaction([DB_ORDER_STORE, DB_ICON_STORE],
+                                      'readonly');
+        var orderStore = txn.objectStore(DB_ORDER_STORE);
+        var iconStore = txn.objectStore(DB_ICON_STORE);
+        var cursor = orderStore.index('order').openCursor();
+        var results = [];
+
+        cursor.onsuccess = e => {
+          var cursor = e.target.result;
+          if (cursor) {
+            var result = cursor.value;
+            var iconRequest = iconStore.get(result.id);
+            iconRequest.onsuccess = function(result, e) {
+              if (e.target.result) {
+                result.icon = e.target.result.icon;
+              }
+              results.push(result);
+              if (onResult) {
+                onResult(result);
+              }
+            }.bind(this, result);
+            cursor.continue();
+          }
+        };
+
+        txn.oncomplete = () => {
+          resolve(results);
+        };
+      });
+    }
+  };
+
+  exports.AppsMetadata = AppsMetadata;
+
+}(window));