Do not bind logger to global object, now it's a part of serverOptions

lib/utils/logger.js

@@ -0,0 +1,48 @@
+'use strict';
+
+const pino = require('pino');
+
+module.exports = class Logger {
+    constructor () {
+        const { LOG_LEVEL, NODE_ENV } = process.env;
+        const options = {
+            base: null, // Do not bind hostname, pid and friends by default
+            level: LOG_LEVEL || NODE_ENV === 'test' ? 'fatal' : 'info'
+        };
+        const dest = pino.destination({ sync: false });
+
+        this._logger = pino(options, dest);
+    }
+
+    trace (...args) {
+        this._logger.trace(...args);
+    }
+
+    debug (...args) {
+        this._logger.debug(...args);
+    }
+
+    info (...args) {
+        this._logger.info(...args);
+    }
+
+    warn (...args) {
+        this._logger.warn(...args);
+    }
+
+    error (...args) {
+        this._logger.error(...args);
+    }
+
+    fatal (...args) {
+        this._logger.fatal(...args);
+    }
+
+    child (...args) {
+        return this._logger.child(...args);
+    }
+
+    finish (callback) {
+        return pino.final(this._logger, callback);
+    }
+};