refactored server

server/storage/redis.js

@@ -0,0 +1,21 @@
+const promisify = require('util').promisify;
+
+module.exports = function(config) {
+  const redis_lib =
+    config.env === 'development' && config.redis_host === 'localhost'
+      ? 'redis-mock'
+      : 'redis';
+
+  //eslint-disable-next-line security/detect-non-literal-require
+  const redis = require(redis_lib);
+  const client = redis.createClient({
+    host: config.redis_host,
+    connect_timeout: 10000
+  });
+
+  client.ttlAsync = promisify(client.ttl);
+  client.hgetallAsync = promisify(client.hgetall);
+  client.hgetAsync = promisify(client.hget);
+  client.pingAsync = promisify(client.ping);
+  return client;
+};