@lexamica-modules/logger/src/middleware.ts

The various loggers and transports used for API logging in the Lexamica Eco-system

import morgan from 'morgan';
import { isDevelopment } from './environment';
import { requestFormatter } from './formatting';
import winston from 'winston';

export function createLoggerMiddleware({
  logger,
  format,
  environment,
}: {
  logger: winston.Logger;
  format: string;
  environment: string;
}) {
  if (logger && !!logger.info) {
    return morgan(
      isDevelopment(environment) ? 'short' : format ?? requestFormatter,
      {
        stream: {
          write: (message) => {
            try {
              const data = JSON.parse(message);
              logger.http(data);
            } catch (err) {
              logger.info(message);
            }
          },
        },
      }
    );
  } else {
    throw new Error(
      'You must pass in a winston logger instance (as a named argument, logger) to create logging middleware.'
    );
  }
}