update File to write wallets to different files

the walletId is the filename

js/models/storage/File.js

@@ -6,47 +6,54 @@ function Storage(opts) {
   opts = opts || {};
 
   this.data = {};
-  this.filename = opts.filename;
 }
 
-Storage.prototype.load = function(callback) {
-  if (!this.filename)
-    throw new Error('No filename');
-
-  fs.readFile(this.filename, function(err, data) {
+Storage.prototype.load = function(walletId, callback) {
+  fs.readFile(walletId, function(err, data) {
     if (err) return callback(err);
 
     try {
-      this.data = JSON.parse(data);
+      this.data[walletId] = JSON.parse(data);
     } catch (err) {
-      return callback(err);
+      if (callback)
+        return callback(err);
     }
 
-    return callback(null);
+    if (callback)
+      return callback(null);
   });
 };
 
-Storage.prototype.save = function(callback) {
-  var data = JSON.stringify(this.data);
+Storage.prototype.save = function(walletId, callback) {
+  var data = JSON.stringify(this.data[walletId]);
 
   //TODO: update to use a queue to ensure that saves are made sequentially
-  fs.writeFile(this.filename, data, function(err) {
-    return callback(err);
+  fs.writeFile(walletId, data, function(err) {
+    if (callback)
+      return callback(err);
   });
 };
 
 Storage.prototype._read = function(k) {
-  return this.data[k];
+  var split = k.split('::');
+  var walletId = split[0];
+  var key = split[1];
+  return this.data[walletId][key];
 };
 
 Storage.prototype._write = function(k, v, callback) {
-  this.data[k] = v;
-  this.save(callback);
+  var split = k.split('::');
+  var walletId = split[0];
+  var key = split[1];
+  if (!this.data[walletId])
+    this.data[walletId] = {};
+  this.data[walletId][key] = v;
+  this.save(walletId, callback);
 };
 
 // get value by key
 Storage.prototype.getGlobal = function(k) {
-  return this.data[k];
+  return this._read(k);
 };
 
 // set value for key
@@ -56,13 +63,17 @@ Storage.prototype.setGlobal = function(k, v, callback) {
 
 // remove value for key
 Storage.prototype.removeGlobal = function(k, callback) {
-  delete this.data[k];
-  this.save(callback);
+  var split = k.split('::');
+  var walletId = split[0];
+  var key = split[1];
+  delete this.data[walletId][key];
+  this.save(walletId, callback);
 };
 
 Storage.prototype._key = function(walletId, k) {
   return walletId + '::' + k;
 };
+
 // get value by key
 Storage.prototype.get = function(walletId, k) {
   return this.getGlobal(this._key(walletId, k));