Move from heroku to aws ec2 (Close #229)

.gitignore

@@ -4,3 +4,4 @@
 /npm-debug.log
 /src/backend/public
 .DS_Store
+/pm2.config.js

package.json

@@ -8,8 +8,7 @@
     "build": "npm run build:frontend && npm run build:backend",
     "build:frontend": "NODE_ENV=production node ./node_modules/webpack/bin/webpack --bail --progress --config webpack.frontend.config.js",
     "build:backend": "NODE_ENV=production node ./node_modules/webpack/bin/webpack --bail --progress --config webpack.backend.config.js",
-    "lint": "./node_modules/.bin/eslint --fix src",
-    "heroku-postbuild": "npm run build"
+    "lint": "./node_modules/.bin/eslint --fix src"
   },
   "repository": {
     "type": "git",

src/backend/index.js

+import path from 'path';
 import express from 'express';
 import morgan from 'morgan';
 import cookieParser from 'cookie-parser';
@@ -5,6 +6,7 @@ import bodyParser from 'body-parser';
 import * as controllers from '/controllers';
 import { ClientError, ForbiddenError, NotFoundError, UnauthorizedError } from '/common/error';
 import webhook from '/common/webhook';
+import { execute } from '/common/util';
 
 const app = express();
 app.use(morgan('tiny'));
@@ -28,4 +30,19 @@ app.use((err, req, res, next) => {
   console.error(err);
 });
 
+const rootPath = path.resolve(__dirname, '..', '..');
+webhook.on('algorithm-visualizer', event => {
+  switch (event) {
+    case 'push':
+      execute([
+        'git fetch',
+        'git reset --hard origin/master',
+        'npm install',
+        'npm run build',
+        'pm2 startOrRestart ./pm2.config.js',
+      ].join(' && '), rootPath);
+      break;
+  }
+});
+
 export default app;