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Viewing file:     container.js (3.18 KB)      -rw-r--r--

/**
 * container.js: Inversion of control container for winston logger instances.
 *
 * (C) 2010 Charlie Robbins
 * MIT LICENCE
 */

'use strict';

const createLogger = require('./create-logger');

/**
 * Inversion of control container for winston logger instances.
 * @type {Container}
 */
module.exports = class Container {
  /**
   * Constructor function for the Container object responsible for managing a
   * set of `winston.Logger` instances based on string ids.
   * @param {!Object} [options={}] - Default pass-thru options for Loggers.
   */
  constructor(options = {}) {
    this.loggers = new Map();
    this.options = options;
  }

  /**
   * Retreives a `winston.Logger` instance for the specified `id`. If an
   * instance does not exist, one is created.
   * @param {!string} id - The id of the Logger to get.
   * @param {?Object} [options] - Options for the Logger instance.
   * @returns {Logger} - A configured Logger instance with a specified id.
   */
  add(id, options) {
    if (!this.loggers.has(id)) {
      // Remark: Simple shallow clone for configuration options in case we pass
      // in instantiated protoypal objects
      options = Object.assign({}, options || this.options);
      const existing = options.transports || this.options.transports;

      // Remark: Make sure if we have an array of transports we slice it to
      // make copies of those references.
      options.transports = existing ? existing.slice() : [];

      const logger = createLogger(options);
      logger.on('close', () => this._delete(id));
      this.loggers.set(id, logger);
    }

    return this.loggers.get(id);
  }

  /**
   * Retreives a `winston.Logger` instance for the specified `id`. If
   * an instance does not exist, one is created.
   * @param {!string} id - The id of the Logger to get.
   * @param {?Object} [options] - Options for the Logger instance.
   * @returns {Logger} - A configured Logger instance with a specified id.
   */
  get(id, options) {
    return this.add(id, options);
  }

  /**
   * Check if the container has a logger with the id.
   * @param {?string} id - The id of the Logger instance to find.
   * @returns {boolean} - Boolean value indicating if this instance has a
   * logger with the specified `id`.
   */
  has(id) {
    return !!this.loggers.has(id);
  }

  /**
   * Closes a `Logger` instance with the specified `id` if it exists.
   * If no `id` is supplied then all Loggers are closed.
   * @param {?string} id - The id of the Logger instance to close.
   * @returns {undefined}
   */
  close(id) {
    if (id) {
      return this._removeLogger(id);
    }

    this.loggers.forEach((val, key) => this._removeLogger(key));
  }

  /**
   * Remove a logger based on the id.
   * @param {!string} id - The id of the logger to remove.
   * @returns {undefined}
   * @private
   */
  _removeLogger(id) {
    if (!this.loggers.has(id)) {
      return;
    }

    const logger = this.loggers.get(id);
    logger.close();
    this._delete(id);
  }

  /**
   * Deletes a `Logger` instance with the specified `id`.
   * @param {!string} id - The id of the Logger instance to delete from
   * container.
   * @returns {undefined}
   * @private
   */
  _delete(id) {
    this.loggers.delete(id);
  }
};