edit db_connection file for AWS case

related #319

server/database/db_connection.js

@@ -5,19 +5,31 @@ require('env2')('./config.env');
 
 pg.defaults.ssl = true;
 
-if (!process.env.GROW_DB_URL) throw new Error('Environment variable GROW_DB_URL\
-must be set');
+let options = { max: process.env.DB_MAX_CONNECTIONS || 2, };
 
-const params = url.parse(process.env.GROW_DB_URL);
-const [ username, password, ] = params.auth.split(':');
-
-const options = {
-  user: username,
-  password: password,
-  host: params.hostname,
-  port: params.port,
-  database: params.pathname.split('/')[1],
-  max: process.env.DB_MAX_CONNECTIONS || 2,
-};
+// used for heroku DB
+if (process.env.GROW_DB_URL) {
+  const params = url.parse(process.env.GROW_DB_URL);
+  const [ username, password, ] = params.auth.split(':');
+  options = Object.assign(options, {
+    user: username,
+    password: password,
+    host: params.hostname,
+    port: params.port,
+    database: params.pathname.split('/')[1],
+  });
+  // used for AWS RDS DB
+} else if (process.env.RDS_DB_NAME) {
+  options = Object.assign(options, {
+    user: process.env.RDS_USERNAME,
+    password: process.env.RDS_PASSWORD,
+    host: process.env.RDS_HOSTNAME,
+    port: process.env.RDS_PORT,
+    database: process.env.RDS_DB_NAME,
+  });
+  // error case
+} else {
+  throw new Error('database credentials must be set');
+}
 
 module.exports = new Pool(options);