switch from mongodb-backed data to filesystem-backed

data/comp-b51422fbc0480e544784b4c2b119f666ea8c1e2b.json

@@ -0,0 +1,6 @@
+{
+  "created": 1429314628678,
+  "a": "a",
+  "b": "n",
+  "_id": "b51422fbc0480e544784b4c2b119f666ea8c1e2b"
+}

package.json

@@ -4,6 +4,7 @@
   "main": "server/app.js",
   "dependencies": {
     "body-parser": "~1.5.0",
+    "chance": "~0.7.3",
     "composable-middleware": "^0.3.0",
     "compression": "~1.0.1",
     "connect-mongo": "^0.4.1",
@@ -13,6 +14,7 @@
     "express-jwt": "^0.1.3",
     "express-session": "~1.0.2",
     "jade": "~1.2.0",
+    "jsonfile": "~2.0.0",
     "jsonwebtoken": "^0.3.0",
     "lex": "^1.7.8",
     "lodash": "~2.4.1",

server/api/comparison/comparison.controller.js

@@ -4,54 +4,84 @@
 var _ = require('lodash');
 var Comparison = require('./comparison.model');
 var wdiff = require('../../components/wdiff');
-var mongoose = require('mongoose');
+var jf = require('jsonfile');
+var fs = require('fs');
+
 
 
 //return the comparison given an id, if it exsits
 exports.showComparison = function showComparison(req, res) {
-  Comparison.findById(req.params.id).exec(function (err, comparison) {
-    if(err) { return handleError(res, err); }
-    if(!comparison) { return res.send(404); }
-    return res.json(comparison);
+  //generate a filename
+  var filename = fnComparison(req.params.id);
+
+  //check if that file exists
+  fs.exists(filename, function (exists) {
+    //if the file does not exist, return a 404
+    if (!exists)  return res.send(404);
+
+    //otherwise, read the file as JSON
+    jf.readFile(filename, function(err, comparison) {
+      if(err) { return handleError(res, err); }
+
+      //and return
+      return res.json(comparison);
+    });
   });
 }
 
 //return a markdown wdiff for the comparison given an id, if it exsits
 exports.wdiffMarkdownComparison = function wdiffMarkdownComparison(req, res) {
-  Comparison.findById(req.params.id).exec(function (err, comparison) {
-    if(err) { return handleError(res, err); }
-    if(!comparison) { return res.send(404); }
+  //generate a filename
+  var filename = fnComparison(req.params.id);
 
-    wdiff(comparison.a,comparison.b, true, function(err, result) {
-      if (err)
-        return handleError(res, err);
+  //check if that file exists
+  fs.exists(filename, function (exists) {
+    //if the file does not exist, return a 404
+    if (!exists)  return res.send(404);
 
-      _.merge(result, comparison._doc)
-      return res.json(result);
+    //otherwise, read the file as JSON
+    jf.readFile(filename, function(err, comparison) {
+      if(err) { return handleError(res, err); }
+
+      //now perform a wdiff on the result
+      wdiff(comparison.a,comparison.b, true, function(err, result) {
+        if (err)
+          return handleError(res, err);
+
+        _.merge(result, comparison)
+        return res.json(result);
+      });
     });
   });
 }
 
 // Creates a new comparison
-exports.create = function(req, res) {
-  //we do not allow the api client to change the id willy-nilly!
-  if (req.body._id) { delete req.body._id; }
+exports.create = function create(req, res) {
+  var a = req.body.a;
+  var b = req.body.b;
 
-  var comparison = req.body;
+  //create the comparison
+  var comparison = new Comparison(a,b);
 
+  //look up its filename
+  var filename = fnComparison(comparison._id);
 
-  //and add to the db
-  Comparison.create(comparison, function(err, comparison) {
+  //and write it to the filesystem
+  jf.writeFile(filename, comparison, function(err) {
     if(err) { return handleError(res, err); }
 
-    //save the document and return
-    comparison.save(function (err, comparison) {
-      if(err) { return handleError(res, err); }
-        return res.json(201, comparison);
-    });
+    //if successful, return the comparison object
+    return res.json(201, comparison);
   });
 };
 
 function handleError(res, err) {
+  console.log(err);
   return res.send(500, err);
 }
+
+
+// returns a filename for the given comparison
+function fnComparison (id) {
+  return "./data/" + "comp-" + id + ".json";
+}

server/api/comparison/comparison.model.js

@@ -1,13 +1,19 @@
 'use strict';
 
-var mongoose = require('mongoose'),
-    Schema = mongoose.Schema;
+// Load Chance
+var Chance = require('chance');
 
-var ComparisonSchema = new Schema({
-  created: {type: Date, default: Date.now},
+// Instantiate Chance so it can be used
+var chance = new Chance();
 
-  a: String,
-  b: String,
-});
 
-module.exports = mongoose.model('Comparison', ComparisonSchema);
+var Comparison = function Comparison(a,b) {
+  return {
+    created: Date.now(),
+    a: a,
+    b: b,
+    _id: chance.hash()
+  };
+};
+
+module.exports = Comparison;

server/app.js

@@ -8,14 +8,8 @@
 process.env.NODE_ENV = process.env.NODE_ENV || 'development';
 
 var express = require('express');
-var mongoose = require('mongoose');
 var config = require('./config/environment');
 
-// Connect to database
-mongoose.connect(config.mongo.uri, config.mongo.options);
-
-// Populate DB with sample data
-if(config.seedDB) { require('./config/seed'); }
 
 // Setup server
 var app = express();

server/config/express.js

@@ -15,8 +15,6 @@ var errorHandler = require('errorhandler');
 var path = require('path');
 var config = require('./environment');
 var session = require('express-session');
-var mongoStore = require('connect-mongo')(session);
-var mongoose = require('mongoose');
 
 module.exports = function(app) {
   var env = app.get('env');
@@ -28,16 +26,7 @@ module.exports = function(app) {
   app.use(bodyParser.json());
   app.use(methodOverride());
   app.use(cookieParser());
-  app.use(passport.initialize());
 
-  // Persist sessions with mongoStore
-  // We need to enable sessions for passport twitter because its an oauth 1.0 strategy
-  app.use(session({
-    secret: config.secrets.session,
-    resave: true,
-    saveUninitialized: true,
-    store: new mongoStore({ mongoose_connection: mongoose.connection })
-  }));
   
   if ('production' === env) {
     app.use(favicon(path.join(config.root, 'public', 'favicon.ico')));

server/config/seed.js

@@ -1,6 +0,0 @@
-/**
- * Populate DB with sample data on server start
- * to disable, edit config/environment/index.js, and set `seedDB: false`
- */
-
-'use strict';