From d6da8b7d8df6fed8aea7e1f0cdaddbe09e6ff97b Mon Sep 17 00:00:00 2001
From: Louis Chatriot <louis.chatriot@gmail.com>
Date: Thu, 2 May 2013 19:03:20 +0200
Subject: [PATCH] Externalize serialization and deserialization

---
 lib/datastore.js |  9 +++++----
 lib/model.js     | 19 +++++++++++++++++++
 2 files changed, 24 insertions(+), 4 deletions(-)
 create mode 100644 lib/model.js

diff --git a/lib/datastore.js b/lib/datastore.js
index f0518e2..1b6dc7b 100644
--- a/lib/datastore.js
+++ b/lib/datastore.js
@@ -10,6 +10,7 @@
 var fs = require('fs')
   , path = require('path')
   , customUtils = require('./customUtils')
+  , model = require('./model')
   ;
 
 
@@ -62,7 +63,7 @@ Datastore.treatRawData = function (rawData) {
     var doc;
 
     try {
-      doc = JSON.parse(d);
+      doc = model.deserialize(d);
       res.push(doc);
     } catch (e) {
     }
@@ -84,7 +85,7 @@ Datastore.prototype.insert = function (newDoc, cb) {
 
   try {
     newDoc._id = customUtils.uid(16);
-    persistableNewDoc = JSON.stringify(newDoc);
+    persistableNewDoc = model.serialize(newDoc);
   } catch (e) {
     return callback(e);
   }
@@ -92,7 +93,7 @@ Datastore.prototype.insert = function (newDoc, cb) {
   fs.appendFile(self.filename, persistableNewDoc + '\n', 'utf8', function (err) {
     if (err) { return callback(err); }
 
-    var insertedDoc = JSON.parse(persistableNewDoc);
+    var insertedDoc = model.deserialize(persistableNewDoc);
     self.data.push(insertedDoc);   // Make sure the doc is the same on the disk and in memory
                                                      // Some docs can't be stringified correctly
     return callback(null, insertedDoc);
@@ -174,7 +175,7 @@ Datastore.prototype.persistWholeDatabase = function (data, cb) {
   callback = cb || function () {};
 
   data.forEach(function (d) {
-    newContents += JSON.stringify(d) + '\n';
+    newContents += model.serialize(d) + '\n';
   });
 
   fs.writeFile(self.filename, newContents, 'utf8', callback);
diff --git a/lib/model.js b/lib/model.js
new file mode 100644
index 0000000..2edf1b1
--- /dev/null
+++ b/lib/model.js
@@ -0,0 +1,19 @@
+/**
+ * Handle models (i.e. docs)
+ * Serialization/deserialization
+ * Copying
+ */
+
+function serialize (obj) {
+  return JSON.stringify(obj);
+}
+
+function deserialize (rawData) {
+  return JSON.parse(rawData);
+}
+
+
+// Interface
+module.exports.serialize = serialize;
+module.exports.deserialize = deserialize;
+