support migration scripts relax#68

app.js

@@ -1,16 +1,22 @@
-import app from './lib/server';
-import config from './config';
 import mongoose from 'mongoose';
+import config from './config';
 import logger from './lib/logger';
+import app from './lib/server';
+import migrate from './lib/server/migrate';
 
 // Connect mongoose
 if (!config.db) {
   throw new Error('Configuration to MongoDB required');
 }
 mongoose.connect(config.db.uri, config.db);
 
-// Start server
-var server = app.listen(config.port, () => {
-   var port = server.address().port;
-   logger.debug('Listening at port', port);
-});
+// Run migrations
+migrate()
+  .then(() => {
+    // Start server
+    var server = app.listen(config.port, () => {
+       var port = server.address().port;
+       logger.debug('Listening at port', port);
+    });
+  })
+  .done();

lib/server/migrate.js

@@ -0,0 +1,38 @@
+import {readdirSync} from 'fs';
+import {basename, extname, join} from 'path';
+import Q from 'q';
+import semver from 'semver';
+import logger from '../logger';
+import MigrationModel from './models/migration';
+
+const migrationsPath = join(__dirname, '../../migrations');
+
+function runMigration (path) {
+  const migration = require(join(migrationsPath, path));
+  return migration()
+    .then(() => saveMigration(path))
+    .then(() => logger.info(`migration ${path} was applied`));
+}
+
+function saveMigration (path) {
+  return new MigrationModel({_id: path}).save();
+}
+
+export default function migrate () {
+  return Q()
+    .then(() => {
+      var promise = Q();
+
+      readdirSync(migrationsPath)
+        .map((path) => extname(path) === '.js' ? basename(path) : false)
+        .filter((path) => path && semver.valid(path.split('-')[0]))
+        .sort((a, b) => semver.compare(a.split('-')[0], b.split('-')[0]))
+        .forEach((path) => {
+          promise = promise
+            .then(() => MigrationModel.findOne({_id: path}).exec())
+            .then((migration) => !migration && runMigration(path));
+        });
+
+        return promise;
+    });
+}

lib/server/models/migration.js

@@ -0,0 +1,13 @@
+import mongoose from 'mongoose';
+
+const migrationSchema = new mongoose.Schema({
+  _id: {
+    type: String
+  },
+  when: {
+    type: Date,
+    default: Date.now
+  }
+});
+
+export default mongoose.model('Migration', migrationSchema);

package.json

@@ -59,6 +59,7 @@
     "react-google-maps": "^2.0.3",
     "relax-framework": "^0.0.7",
     "rimraf": "^2.4.3",
+    "semver": "^5.0.3",
     "sharp": "^0.11.2",
     "slug": "^0.9.1",
     "soundmanager2": "git://github.com/relax/SoundManager2.git",