feat: can load custom log4js config log4js.json

- Load custom `log4js.json` if exists in config directory
- Load default `log4js.default.json` config
when `log4js.json` is not exists

.gitignore

@@ -41,4 +41,5 @@ tempScript
 /public/scripts/config.js
 
 #ignore config file of pluginsConfig
-/plugins/config.js
+/plugins/config.js
+/config/log4js.json

utils/fileExist.js

@@ -0,0 +1,79 @@
+const { promises, statSync, Stats } = require("fs");
+
+/**
+ * @typedef Error
+ * @property {string} code
+ */
+
+/**
+ * @typedef Options
+ * @property {boolean} includeDirectories
+ */
+
+
+/**
+ * 
+ * @param {Error} e 
+ * @returns 
+ */
+function handleError(e) {
+    if (e.code === "ENOENT") {
+        return false;
+    } else {
+        return undefined;
+    }
+}
+
+/**
+ * 
+ * @param {Stats} result 
+ * @param {Options} options 
+ * @returns 
+ */
+function handleResult(result, options) {
+    return (
+        result.isFile() ||
+        Boolean(options?.includeDirectories && result.isDirectory())
+    );
+}
+
+/**
+ * asynchronous function for checking file is exists
+ * @param {string} path 
+ * @param {Options} options 
+ * @returns {boolean}
+ */
+async function fileExists(
+    path,
+    options = {}
+) {
+    return promises
+        .stat(path)
+        .then((result) => {
+            return handleResult(result, options);
+        })
+        .catch((e) => {
+            return handleError(e);
+        });
+}
+
+/**
+ * synchronous function for checking file is exists
+ * @param {string} path 
+ * @param {Options} options 
+ * @returns {boolean}
+ */
+function fileExistsSync(
+    path,
+    options
+) {
+    try {
+        const result = statSync(path);
+        return handleResult(result, options);
+    } catch (e) {
+        return handleError(e);
+    }
+}
+
+module.exports.fileExists = fileExists;
+module.exports.fileExistsSync = fileExistsSync;

utils/log.js

@@ -1,7 +1,14 @@
 const fs = require('fs');
 const path = require('path');
+const { fileExistsSync } = require("./fileExist");
 const { configure, getLogger } = require('log4js');
-configure(path.join(__dirname, "../config/log4js.default.json"));
+const USER_LOG_CONFIG_FILENAME = path.join(__dirname, "../config/log4js.json");
+const DEFAULT_LOG_CONFIG_FILENAME = path.join(__dirname, "../config/log4js.default.json");
+if (fileExistsSync(USER_LOG_CONFIG_FILENAME)) {
+    configure(USER_LOG_CONFIG_FILENAME);
+} else {
+    configure(DEFAULT_LOG_CONFIG_FILENAME);
+}
 let raccoonLogger = getLogger();
 
 module.exports.logger = raccoonLogger;