Merge branch 'db' into service

* db:
  添加 Redis是否enabled的配置处理

src/config.ts

@@ -12,6 +12,7 @@ const config = {
         password: ''
     },
     redis: {
+        enable: false,
         host: 'localhost',
         port: 6379,
         password: '' // localhost

src/lib/Database/RedisConnection.ts

@@ -7,6 +7,11 @@ class _RedisConnection {
     private logger = new Logger('Redis')
 
     constructor() {
+        if (!config.redis.enable) {
+            this.logger.info('Database is disabled, initialization terminated');
+            return;
+        }
+
         try {
             this.pool = new Redis({
                 port: config.redis.port,