databridge-logger/lib/backends/file.js

aggregate logs from all databridge clients

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _createClass = 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); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }(); /**
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * @author Guillaume Leclerc <guillaume.leclerc.work@gmail.com>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      */

var _fs = require('mz/fs');

var _fs2 = _interopRequireDefault(_fs);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

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

/**
 * A backend that writes the logs to a single file
 *
 * It does not support log rotation
 */
var FileBackend = function () {
  /**
   * Create a new FileBackend from the path of the file to write
   *
   * @param {string} filename the file where we should store the file
   */
  function FileBackend(filename) {
    _classCallCheck(this, FileBackend);

    this.file = _fs2.default.createWriteStream(filename, {
      flags: 'a+',
      defaultEncoding: 'utf8',
      autoClose: true
    });
  }

  /**
   * Store a message/packet using this backend
   *
   * @param {Array<object>} messages the messages to persist
   * @return {Promise} a promise when the writing is done
   */


  _createClass(FileBackend, [{
    key: 'store',
    value: function store(messages) {
      var mergedMessages = messages.map(JSON.stringify).join('\n');

      return this.file.write(mergedMessages);
    }
  }]);

  return FileBackend;
}();

exports.default = FileBackend;