Local Storage

lib/connectors/memory.js

@@ -71,27 +71,43 @@ function deserialize(dbObj) {
 
 Memory.prototype.loadFromFile = function(callback) {
   var self = this;
+  var hasLocalStorage = typeof window !== 'undefined' && window.localStorage;
+  var localStorage = hasLocalStorage && this.settings.localStorage;
+
   if (self.settings.file) {
     fs.readFile(self.settings.file, {encoding: 'utf8', flag: 'r'}, function (err, data) {
       if (err && err.code !== 'ENOENT') {
         callback && callback(err);
       } else {
-        if (data) {
-          data = JSON.parse(data.toString());
-          self.ids = data.ids || {};
-          self.cache = data.models || {};
-        } else {
-          if(!self.cache) {
-            self.ids = {};
-            self.cache = {};
-          }
-        }
-        callback && callback();
+        parseAndLoad(data);
       }
     });
+  } else if(localStorage) {
+    var data = window.localStorage.getItem(localStorage);
+    data = data || '{}';
+    parseAndLoad(data);
   } else {
     process.nextTick(callback);
   }
+
+  function parseAndLoad(data) {
+    if (data) {
+      try {
+        data = JSON.parse(data.toString());
+      } catch(e) {
+        return callback(e);
+      }
+
+      self.ids = data.ids || {};
+      self.cache = data.models || {};
+    } else {
+      if(!self.cache) {
+        self.ids = {};
+        self.cache = {};
+      }
+    }
+    callback && callback();
+  }
 };
 
 /*!
@@ -100,7 +116,10 @@ Memory.prototype.loadFromFile = function(callback) {
  */
 Memory.prototype.saveToFile = function (result, callback) {
   var self = this;
-  if (this.settings.file) {
+  var file = this.settings.file;
+  var hasLocalStorage = typeof window !== 'undefined' && window.localStorage;
+  var localStorage = hasLocalStorage && this.settings.localStorage;
+  if (file) {
     if(!self.writeQueue) {
       // Create a queue for writes
       self.writeQueue = async.queue(function (task, cb) {
@@ -121,6 +140,16 @@ Memory.prototype.saveToFile = function (result, callback) {
       data: result,
       callback: callback
     });
+  } else if (localStorage) {
+    // Flush out the models/ids
+    var data = JSON.stringify({
+      ids: self.ids,
+      models: self.cache
+    }, null, '  ');
+    window.localStorage.setItem(localStorage, data);
+    process.nextTick(function () {
+      callback && callback(null, result);
+    });
   } else {
     process.nextTick(function () {
       callback && callback(null, result);
@@ -421,4 +450,4 @@ function merge(base, update) {
     base[key] = update[key];
   });
   return base;
-}
+}