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Viewing file:     stream.js (1.71 KB)      -rw-r--r--

/**
 * stream.js: Transport for outputting to any arbitrary stream.
 *
 * (C) 2010 Charlie Robbins
 * MIT LICENCE
 */

'use strict';

const isStream = require('is-stream');
const { MESSAGE } = require('triple-beam');
const os = require('os');
const TransportStream = require('winston-transport');

/**
 * Transport for outputting to any arbitrary stream.
 * @type {Stream}
 * @extends {TransportStream}
 */
module.exports = class Stream extends TransportStream {
  /**
   * Constructor function for the Console transport object responsible for
   * persisting log messages and metadata to a terminal or TTY.
   * @param {!Object} [options={}] - Options for this instance.
   */
  constructor(options = {}) {
    super(options);

    if (!options.stream || !isStream(options.stream)) {
      throw new Error('options.stream is required.');
    }

    // We need to listen for drain events when write() returns false. This can
    // make node mad at times.
    this._stream = options.stream;
    this._stream.setMaxListeners(Infinity);
    this.isObjectMode = options.stream._writableState.objectMode;
    this.eol = options.eol || os.EOL;
  }

  /**
   * Core logging method exposed to Winston.
   * @param {Object} info - TODO: add param description.
   * @param {Function} callback - TODO: add param description.
   * @returns {undefined}
   */
  log(info, callback) {
    setImmediate(() => this.emit('logged', info));
    if (this.isObjectMode) {
      this._stream.write(info);
      if (callback) {
        callback(); // eslint-disable-line callback-return
      }
      return;
    }

    this._stream.write(`${info[MESSAGE]}${this.eol}`);
    if (callback) {
      callback(); // eslint-disable-line callback-return
    }
    return;
  }
};