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Viewing file:     container.js (4.53 KB)      -rw-r--r--

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

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var createLogger = require('./create-logger');
/**
 * Inversion of control container for winston logger instances.
 * @type {Container}
 */


module.exports = /*#__PURE__*/function () {
  /**
   * 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.
   */
  function Container() {
    var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

    _classCallCheck(this, Container);

    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.
   */


  _createClass(Container, [{
    key: "add",
    value: function add(id, options) {
      var _this = this;

      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);
        var 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() : [];
        var logger = createLogger(options);
        logger.on('close', function () {
          return _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.
     */

  }, {
    key: "get",
    value: function 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`.
     */

  }, {
    key: "has",
    value: function 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}
     */

  }, {
    key: "close",
    value: function close(id) {
      var _this2 = this;

      if (id) {
        return this._removeLogger(id);
      }

      this.loggers.forEach(function (val, key) {
        return _this2._removeLogger(key);
      });
    }
    /**
     * Remove a logger based on the id.
     * @param {!string} id - The id of the logger to remove.
     * @returns {undefined}
     * @private
     */

  }, {
    key: "_removeLogger",
    value: function _removeLogger(id) {
      if (!this.loggers.has(id)) {
        return;
      }

      var 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
     */

  }, {
    key: "_delete",
    value: function _delete(id) {
      this.loggers["delete"](id);
    }
  }]);

  return Container;
}();