Use internal logger instead of debug/console for logging

Resolve #4104
Resolve #1966
Resolve #1937

src/db/elasticsearch.ts

@@ -1,5 +1,8 @@
 import * as elasticsearch from 'elasticsearch';
 import config from '../config';
+import Logger from '../misc/logger';
+
+const esLogger = new Logger('es');
 
 const index = {
 	settings: {
@@ -50,9 +53,9 @@ if (client) {
 		requestTimeout: 30000
 	}, error => {
 		if (error) {
-			console.error('elasticsearch is down!');
+			esLogger.error('elasticsearch is down!');
 		} else {
-			console.log('elasticsearch is available!');
+			esLogger.succ('elasticsearch is available!');
 		}
 	});
 

src/db/mongodb.ts

@@ -18,6 +18,7 @@ export default db;
  * MongoDB native module (officialy)
  */
 import * as mongodb from 'mongodb';
+import Logger from '../misc/logger';
 
 let mdb: mongodb.Db;
 
@@ -37,3 +38,5 @@ const nativeDbConn = async (): Promise<mongodb.Db> => {
 };
 
 export { nativeDbConn };
+
+export const dbLogger = new Logger('db');