自定義日誌

一個屬於擴充自己的日誌紀錄方式。

index.js

const { TREM, Logger, MixinManager } = this.#ctx;
// 傳入主視窗 Logger 類定義 (父類)
// 導入新的自定義類 (繼承的子類)
const { CustomLogger } = require("./logger").createCustomLogger(Logger);
// 初始化自定義類
this.logger = new CustomLogger("example");
this.logger.info("info");

test.js

// 由於是單例模式，在 index.js 初始化後，即可在任何地方使用。
const logger = require("./logger");
logger.info("info");

logger.js

let globalInstance = null;
let CustomLoggerClass = null;

function createCustomLogger(BaseLogger) {
  if (CustomLoggerClass && globalInstance)
    return {
      CustomLogger: CustomLoggerClass,
      instance: globalInstance,
    };

  class CustomLogger extends BaseLogger {
    constructor(prefix = "") {
      super();

      if (globalInstance) {
        globalInstance.prefix = prefix;
        return globalInstance;
      }

      this.prefix = prefix;
      globalInstance = this;
    }

    _formatMessage(message, ...args) {
      const formattedMessage = super._formatMessage(message, ...args);
      return this.prefix
        ? `[${this.prefix}] ${formattedMessage}`
        : formattedMessage;
    }
  }

  CustomLoggerClass = CustomLogger;

  return {
    CustomLogger,
    instance: globalInstance,
  };
}

function checkInitialized() {
  if (!globalInstance)
    throw new Error(
      "Logger not initialized. Please call createCustomLogger first."
    );
}

module.exports = {
  createCustomLogger,
  info: (...args) => {
    checkInitialized();
    return globalInstance.info(...args);
  },
  error: (...args) => {
    checkInitialized();
    return globalInstance.error(...args);
  },
  warn: (...args) => {
    checkInitialized();
    return globalInstance.warn(...args);
  },
  debug: (...args) => {
    checkInitialized();
    return globalInstance.debug(...args);
  },
  get prefix() {
    checkInitialized();
    return globalInstance.prefix;
  },
};