@apolitical/server/src/helpers/logger.helper.js

Node.js module to encapsulate Apolitical's express server setup

'use strict';

module.exports = ({ morgan, config, logger }) => {
  const {
    LOGGED_OUT_ID,
    TOKENS: { USER_ID },
  } = config.SERVER.MORGAN_OPTIONS;

  function getUserId(req) {
    return req.user && req.user.id ? req.user.id : LOGGED_OUT_ID;
  }

  function buildCustomFormat(tokens, req, res) {
    return [
      tokens.method(req, res),
      tokens.url(req, res),
      tokens.status(req, res),
      tokens[USER_ID](req),
      tokens['response-time'](req, res),
      'ms',
    ].join(' ');
  }

  function buildMiddleware(labels) {
    // Setup Morgan with custom format and Apolitical Logger stream
    morgan.token(USER_ID, getUserId);
    const morganMiddleware = morgan(buildCustomFormat, logger.where(__filename, 'morganMiddleware', labels));
    return morganMiddleware;
  }

  return { getUserId, buildMiddleware };
};