@pryv/stable-object-representation/src/utils/logger.js

Stable JSON Object representation

/**
 * @license
 * Copyright (C) 2020-2021 Pryv S.A. https://pryv.com 
 * This file is part of Open-Pryv.io and released under BSD-Clause-3 License
 * SPDX-License-Identifier: BSD-3-Clause
 */
var fs = require('fs');

var config = require('./config.js');

module.exports.error = function (error, detail) {
  if (config.logger.logToFile) {
    var strLine = error ? JSON.stringify(error) : '';
    return logToFile(strLine + ' ---- ' + detail);
  }
  console.error(error, detail);
};

var log_file;

function logToFile(str) {
  if (! log_file) {
    log_file = fs.createWriteStream(config.logger.logToFile, {flags : 'w'});
  }
  log_file.write(str + '\n');
}